CN101081906B

CN101081906B - Polyimide film and process for producing the same

Info

Publication number: CN101081906B
Application number: CN2007101278495A
Authority: CN
Inventors: 金城永泰; 伊藤利尚; 薮田胜典; 赤堀廉一
Original assignee: Kanegafuchi Chemical Industry Co Ltd
Current assignee: Kaneka Corp
Priority date: 2001-02-27
Filing date: 2002-02-26
Publication date: 2011-02-23
Anticipated expiration: 2022-02-26
Also published as: CN101081906A; JP4490593B2; JP2002248638A

Abstract

A process includes the steps of: casting or coating a polyamic acid organic solvent solution on a support and drying the polyamic acid organic solvent solution thereon, so as to form a partially cured and/or partially dried polyamic acid film; and imidizing the film to form the polyimide film.

Description

Polyimide film and manufacture method thereof

The application is that international application no is PCT/JP 02/01727, and international filing date is that national applications number was the title of 02801457.X dividing an application for the Chinese patent application of " polyimide film and manufacture method thereof " after the PCT international application on February 26th, 2002 entered China's stage.

Technical field

The present invention relates to high-quality polyimide film and the manufacture method that can produce it suitably.

It is good and have a manufacture method of high-intensity polyimide film to the invention still further relates to productivity.

The invention still further relates to and have physical strength and little polyimide film and the manufacture method thereof of width mechanical characteristics deviation.

The interior isotropy of the face that the invention still further relates to well, also has the polyimide film and the manufacture method thereof of the dimensional stability through improving.

The invention still further relates to polyimide film and manufacture method thereof with snappiness and low linear expansion coefficient.

Background technology

Polyimide film has thermotolerance, insulativity, solvent resistance and lower temperature resistance etc., be widely used as the electric electronic Instrument element material of computer and IC control, can exemplify flexible printed circuit or TAB with the electric wire coating of the basement membrane (base film), aircraft etc. of carrier band (carrier tape), the basement membrane of magnetic recording tape, the wire rod coating of superconducting coil (coil) etc.In these various uses, can suitably select suitable polyimide film according to purposes separately.

Demand for this polyimide film increases day by day, presses for to develop the manufacture method with more large-duty polyimide film.

In recent years, use a lot of of polyimide film in the Small Universal instruments such as mobile telephone, electric electronic element is along with miniaturization and thin layerization, and circuit tends to graph thinning, and used size of component changes probably can bring the circuit structure of graph thinning and opens circuit or the fault of short circuit.Therefore, require element used in the electric electronic element to have high-precision dimensional stability.

But the manufacture method of polyimide film is with as the organic solution curtain coating of the polyamic acid of precursor or be coated on the supporting mass mostly, through solidifying, and then carries out methods of heating treatment and makes this film.Make thus and have following problem in polyimide film and the manufacture method thereof.

Usually, above-mentioned manufacture method can adopt in thermal curing method or the chemosetting method arbitrary method to make.That is, under the situation that adopts thermal curing method, make, form polyamide acid film, make it to change into polyimide film by heating then from desolvating as removing the polyamic acid resin liquid (varnish) of polyimide precursor.In this method,, then enough rerum naturas can not be presented, the problem of film breaks etc. can be produced if shorten heat-up time.And under the situation that adopts the chemosetting method, be in polyamic acid resin liquid, to sneak into chemical imidization agent, obtain gel-film (gel film), make its curing, drying again, obtain polyimide film, if the formation time of partly solidified and/or part exsiccant polyamide acid film (gel-film) is shortened, then the chemical imidization of gel-film is just insufficient, and the result can produce the problem that basic physical strength such as tear propagation strength, tensile strength and the bond strength etc. that cause made polyimide film reduces.

In addition, manufacture as polyimide film, mostly as shown in Figure 4, to in forcing machine 102, mix as the polyamic acid solution composition of polyimide precursor with chemical imidization agent solution, after the expansion of forcing machine 102 broad ways, slit-shaped gap by slit die 104, on ring-type conduction band (endless belt), be extruded into level and smooth film continuously, in imidization, drying, cooling and be cured to the degree that has from supporting, and then make through heat treated.

This by making as the polyamic acid composition of polyimide precursor casting method by T pattern head, through film forming, heating, drying, finish imidization, make under the situation of polyimide film, if imidization reaction is carried out intensely in the curtain coating operation, then can produce the part imidization in the resin molding, on film, produce gluey defective, can not carry out the problem of painting process thereby generation part imidization jelly is blocked in the slit die place.As the method for the control imidization reaction that is used to avoid this problem, though polyamic acid solution composition is cooled to below 0 ℃ is that effectively the viscosity of polyamic acid solution composition has the tendency of special rising thus.

Adopting above-mentioned range of viscosities, be that the resin solution composition has elasticity under the situation of the higher like this resin solution composition of viscosity.Therefore, as shown in Figure 5, curtain stream (curtain) 122 with mobile resin solution composition that extrudes from slit die 120 stretches along direct of travel along with the becoming high speed of conduction band speed.When curtain stream 122 followed into direction stretching, the angle θ that lands between the conduction band 124 of curtain stream 122 and knockout machine diminished, so be involved in ambient air easily when the surface of curtain stream 122 arrival conduction bands 124.

As a result, between resin molding 126 and conduction band 124, enclosed air, residual big and small blister jut down on the surface of resin molding 126.This phenomenon that is involved in bubble, thus the air expansion that is involved in when causing the thickness attenuation of resin molding in the drying process breaks resin molding forms damaged portion, as a result grievous injury the superficiality of resin molding.

In addition, aforesaid high viscosity curtain stream is stronger than the elasticity of low viscosity curtain stream, and bigger to the bounding force of conduction band, and therefore following into along with the motion of conduction band, direction stretches.But, curtain stream along with conduction band to direct of travel stretch certain apart from the time, can be because the elastic force of resin molding works the power with direction of travel, thus the touchdown point of curtain stream is periodically changed.Along with this cycle changes, made thickness of resin film changes, and the result produces periodic thickness deviation on direct of travel, and generation presents the problem of striated as the shape of the film of end article.

At this problem, a day disclosure special permission communique spy opens in the flat 11-198157 communique (open day on July 27th, 1999), has disclosed the casting film method that is involved in bubble when preventing the resin molding curtain coating, improves the viscosity in the reduction die head that thickness deviation is a purpose.As the method for viscosity that reduces in the die head, can enumerate the method for the polymerization degree that reduces the resin solution composition and improve the method for the solvent ratio of resin solution composition.

But, open the polyimide film that the method for the reduction polymerization degree that discloses in the flat 11-198157 communique obtains by the spy, with being compared with the polyimide film that quaternary carboxylic acid dianhydride component obtains by the diamine component of equimolar amount, the mechanical properties of film declines to a great extent.And, open in the method for solvent ratio of the raising resin solution composition that discloses in the flat 11-198157 communique the spy, have from supporting in order on the ring-type conduction band, to be dried to, the temperature of the conduction band that must significantly raise, the mechanical properties of gained polyimide film descends as a result.

As mentioned above, the spy open disclose in the flat 11-198157 communique prevent the resin molding curtain coating time be involved in bubble, improve in the casting film method of thickness deviation, the mechanical properties of gained polyimide film declines to a great extent.The decline of this mechanical properties, lax with the stretching generation of film in the operation of the electric wire coating of the basement membrane of making flexible printed circuit or TAB usefulness carrier band, aircraft etc., the basement membrane of magnetic recording tape, the wire rod coating of superconducting coil etc., the result has hindered stably manufactured.And, the reliability reduction that the mechanical properties of these goods descends and also causes goods.

In addition, have in the operation of after the degree of supporting, carrying out heat treated again, in most cases adopt the end to be fixed on clip (clip) or pin carries out methods of heating treatment (being also referred to as expanding (tenter) mode) on (pin) aforesaid being cured to.

But, the temperature that is clipped in the film end of stationary fixtures such as clip or pin is difficult to raise, when the width of the made polyimide film of expansion, when under high temperature, heat-treating in the stove temperature inhomogeneous usually, its reason is to produce the roasting inequality on width, and is particularly obviously not enough in the roasting of end.And when remedying the end underroasting, causing central part to cross roasting next time, the result has produced the problem that rerum natura descends.

And, though described expanding mode is to be used for resisting the cure shrinkage of heating process gel-film in process furnace inner drying and curing process, to keep the suitable known technology of width or tensile simultaneously, end that is held and unconstrained central part are easy to generate deviation on the shrink grading consistence.Therefore, the polyimide molecule chain has become long-standing problem in the end along oblique phenomenon with 45 ℃ of orientations especially.The anisotropy of this molecular orientation, closely related with the characteristic that relates to dimensional stability, therefore become, so can not satisfy as the requirement of the materials such as flexible printed circuit of high-accuracyization day by day along the reason of directivity characteristics difference.

For this reason, as the method that makes isotropic membrane, a day disclosure special permission communique spy opens clear 60-190314 communique (open day on September 27th, 1985), a day disclosure special permission communique spy and opens flat 5-237928 communique (open day on September 17th, 1993) and a day disclosure special permission communique spy and open flat 8-81571 communique (open on March 26th, 1996 day) and disclosed these class methods.

Usually the film of producing is cut into suitable required width,, also carried out the manufacturing of the wide film of width in order to improve the yield that makes a plurality of goods by an original film.

But one of needed characteristic of element of using in above-mentioned electric electronic element is a dimensional stability.In order to improve the Young's modulus of one of key property as this dimensional stability, well-known so far employing has the monomer of the upright and outspoken structure of holding as the Ursol D of diamine component, promptly linear high diamine is preferably, for example a day disclosure special permission communique spy opens in the clear 64-13242 communique (open day on January 18th, 1989) and has put down in writing pyromellitic acid acid anhydride, 4, the example of the ternary component system polyimide of 4 '-diamino-diphenyl ether, Ursol D.If but using upright and outspoken high linear monomer in a large number, the linear expansivity of film can reduce too much, makes it can not be applicable to the purposes of fitting with metallic membrane such as Copper Foil.And generally use upright and outspoken high linear monomer can make the flexibility forfeiture of film, be difficult to produce flexibility as one of flexible printed circuit advantage.And in order to improve Young's modulus, for example a day disclosure special permission communique spy opens to have put down in writing in the clear 61-111359 communique (open day on May 29th, 1986) and adds 3,3 ', 4, the quaternary components system polyimide of 4 '-biphenyl tetracarboxylic dianhydride.But, along with the increase of set of monomers mark, become complicated as the polymerization process of the polyamic acid of polyimide precursor, make to produce and go up the operability difficulty that becomes.In addition, also must use special monomer, unfavorable to cost sometimes.Also have, day disclosure special permission communique spy opens the trial of having narrated in the clear 64-20238 communique (open day on January 24th, 1989) by the improvement rerum natura that stretches.But, need in the manufacturing process to introduce miscellaneous stretching device, and exist kind, the crackly problem of film in the stretch processing process according to polyimide.

Summary of the invention

For achieving the above object, the manufacture method of polyimide film involved in the present invention is characterised in that this method comprises following operation: with the organic solvent solution curtain coating of polyamic acid or be coated on after drying on the supporting mass, make operation partly solidified and/or part exsiccant polyamide acid film; This polyamide acid film be impregnated in tertiary amine or the ertiary amine solution, or on this polyamide acid film, be coated with the operation of tertiary amine or ertiary amine solution; Afterwards, make the polyamic acid imide change into the operation of polyimide, also dry this film.

Polyimide film involved in the present invention can be made by aforesaid method.

Again, for achieving the above object, the manufacture method of polyimide film involved in the present invention is characterised in that this method comprises following operation: sneak into chemical converting agent and catalyzer in the organic solvent solution of polyamic acid after, with the polyamic acid composition curtain coating of gained on supporting mass, on supporting mass, heat with at least 2 temperature standards, then polyamide acid film is peeled from supporting mass, obtain partly solidified and/or part exsiccant polyamide acid film, make remaining amido acid imidization contained in the polyamide acid film afterwards, and dry this film.

Polyimide film involved in the present invention also can be made by aforesaid method.

Again, for achieving the above object, the manufacture method of polyimide film involved in the present invention is characterised in that this method comprises following operation: sneak into chemical converting agent and catalyzer in the organic solvent solution of polyamic acid after, with its curtain coating on supporting mass, after heating, under the residual state that volatile constituent arranged, polyamide acid film is peeled from supporting mass, catalyzer is more than 50 weight parts when obtaining residual volatile constituent and being 100 weight parts, solvent is below 30 weight parts, and chemical converting agent and/or from the partly solidified and/or part exsiccant acid amides sorrel of component below 20 weight parts of chemical converting agent, make remaining polyamic acid continue imidization, and dry this film.

Polyimide film involved in the present invention also can be made by preceding method.

Again, for achieving the above object, the manufacture method of polyimide film involved in the present invention is characterised in that, make in the method for polyimide film at the composition curtain coating system film that will contain polyamic acid, in the organic solvent solution of polyamic acid, add solidifying agent, described solidifying agent contain with respect to amido acid be more than 1 molar equivalent dewatering agent and with respect to the imidization catalyst more than 0.2 molar equivalent of amido acid, and the mol ratio of described dewatering agent and described imidization catalyst is 1: 0.15～1: 0.75.

Again, for achieving the above object, polyimide film involved in the present invention is characterised in that, described polyimide film width during fabrication is more than 1 meter, the maximum value of the tear propagation strength that it records along total width and the ratio of minimum value are more than 0.7, and tear propagation strength is surveyed periodic R value below 0.6g.

And, the inventor finds: 1. the polyamic acid mixing solutions curtain coating that will be made of polyamic acid, dewatering agent, closed loop catalyzer and organic solvent is on the supporting mass of rotation, carry out part and heat/be dried to it and have when supporting, on supporting mass, produce the shrinkage phenomenon of gel-film; 2. by sneaking into dewatering agent and closed loop catalyzer with specific ratio, on supporting mass in the heating/exsiccant process, suppress on the supporting mass to shrink thereby gel-film can be remained on by the suitable bounding force between gel-film and the supporting mass; 3. in addition, under the state that contains the controlled quatity volatile constituent, peel gel-film, its width end is transported to process furnace after fixing when heat-treating operation, under specific temperature condition, begin heating, with regard to the polyimide film of isotropy excellence in the energy acquisition face, thereby finished the present invention.

That is to say that the present invention has reached above-mentioned purpose by novel polyimide film and the manufacture method thereof with following structure is provided.

1) can with the degree of molecular orientation MOR-c of any part in the wide production of the film more than 1250 millimeters, the film all below 1.30, modulus in tension polyimide film below 5.0 more than 2.5Gpa (Ji Pa).

2) manufacture method of polyimide film, it is characterized in that, the polyamic acid mixing solutions curtain coating that will be made of polyamic acid, dewatering agent, closed loop catalyzer and organic solvent is on supporting mass, partly solidified and/or dry have film (hereinafter referred to as gel-film) from supporting until formation, make it pass through process furnace after fixing at the two ends of this gel-film, thereby make polyimide film, in this method

(1) described polyamic acid mixing solutions, being mixed with respect to the amido acid unit is 1.0～5.0 normal dewatering agents and 0.2～2.0 normal closed loop catalyzer, and

(2) the heating starting temperature in the described process furnace is controlled at below supporting mass temperature+100 ℃ and in 150～250 ℃ the scope.

3) as 2) manufacture method of described polyimide film, it is characterized in that the residual volatile component concentration of described gel-film is 15～150%.

4) as 2) or 3) manufacture method of described polyimide film, it is characterized in that, described polyamic acid is by making with the polycondensation as starting monomer of diamine component and acid dianhydride component, and described diamine component contains and accounts for the above Ursol D of 20 moles of % of whole diamine components.

In addition, for achieving the above object, the manufacture method of polyimide film involved in the present invention, it is partly solidified and/or dry and have a so-called gel-film from supporting to be conceived to make polyamic acid as precursor to become: (1) solidify and/or be dried to have specific residual volatile component concentration and (2) after heat treated the time under specific temperature condition, begin heating, by the condition of above-mentioned (1), (2), Young's modulus and linear expansivity are controlled.

Promptly, for achieving the above object, the manufacture method of polyimide film involved in the present invention is characterised in that, comprising by polyamic acid, dewatering agent, the polyamic acid mixing solutions curtain coating that closed loop catalyzer and organic solvent constitute is on supporting mass, through the partly solidified and/or dry curtain coating operation that has film (hereinafter referred to as gel-film) until formation from supporting, and heat treated expanding heating process is being implemented in the manufacture method of interior polyimide film in fixing back, the end of above-mentioned gel-film, residual volatile component concentration by controlling described gel-film and the initial stage temperature in the expanding heating process are set, and control Young's modulus and linear expansivity.

Again, the manufacture method of polyimide film involved in the present invention is characterised in that, comprising the polyamic acid mixing solutions curtain coating that will constitute by polyamic acid, dewatering agent, closed loop catalyzer and organic solvent on supporting mass, through partly solidified and/dry have the operation of film (hereinafter referred to as gel-film) from supporting until formation; And the back is fixed in the end of above-mentioned gel-film implement heat treated expanding heating process in the manufacture method of interior polyimide film, residual volatile component concentration by controlling described gel-film and the initial stage temperature in the expanding heating process are set, make Young's modulus bring up to the scope of 1.0Gpa, perhaps linear expansivity is reduced to 4ppm with in the interior scope.

And polyimide film involved in the present invention is characterised in that it can be made by the manufacture method of above-mentioned polyimide film, and its degree of birefringence is more than 0.15.

Other purpose of the present invention, feature and advantage can fully be understood by the following stated.In addition, benefit of the present invention can be come clear and definite with reference to accompanying drawing by following explanation.

The accompanying drawing summary

Fig. 1 is the form diagrammatic sketch of the tear propagation strength R value obtained.

Fig. 2 is by molecular orientation meter microwave transmission curve that obtains and the diagrammatic sketch that is orientated main shaft.

Fig. 3 is the concise and to the point diagrammatic sketch that degree of birefringence is measured.

Fig. 4 is the manufacturing process diagrammatic sketch of polyimide film.

Fig. 5 is the stream curtain state diagram of being extruded from die lip (die lip) by the casting film method.

The best mode that carries out an invention

The manufacture method of polyimide film of the present invention can be applicable to the manufacturing of any polyimide film basically.

Wherein " part " all is meant weight part.

Used polyamic acid is the precursor of polyimide among the present invention, and all polyamic acids of known per se all can use.As the polymerization process of polyamic acid among the present invention, available all known method, but can be listed below described method as good especially polymerization process:

(1) aromatic diamine is dissolved in the organic polar solvent, makes itself and equimolar aromatic tetracarboxylic acid's two anhydride reactants basically carry out the polymeric method;

(2) aromatic tetracarboxylic acid's dianhydride and the aromatic dicarboxylic amine compound less with respect to its molar weight are reacted in organic polar solvent, obtain the prepolymer that two ends have anhydride group.Then, in whole process, make aromatic tetracarboxylic acid's dianhydride and aromatic dicarboxylic amine compound all carry out the polymeric method with the aromatic dicarboxylic amine compound under the equimolar basically state;

(3) aromatic tetracarboxylic acid's dianhydride and the aromatic dicarboxylic amine compound excessive with respect to its molar weight are reacted in organic polar solvent, obtaining two ends has amino polymkeric substance.After continuing to add the aromatic dicarboxylic amine compound more therein, in whole process, make aromatic tetracarboxylic acid's dianhydride and aromatic dicarboxylic amine compound all carry out the polymeric method with aromatic tetracarboxylic acid's dianhydride under the equimolar basically state;

(4), carry out the polymeric method with the aromatic dicarboxylic amine compound making under the two equimolar basically state with after aromatic tetracarboxylic acid's dianhydride dissolving and/or being scattered in the organic polar solvent;

(5) will be basically the mixture of equimolar aromatic tetracarboxylic acid's dianhydride and aromatic dicarboxylic amine compound in organic polar solvent, react and carry out the polymeric method.

Below used raw material in the manufacturing of the present invention as the polyamic acid of polyimide precursor is described.

Used acid anhydrides in the manufacturing as polyamic acid for example comprises: pyromellitic acid dianhydride, 2,3,6,7-naphthalene tetracarboxylic acid dianhydride, 3,3 ', 4,4 '-biphenyl tetracarboxylic dianhydride, 1,2,5,6-naphthalene tetracarboxylic acid dianhydride, 2,2 ', 3,3 '-biphenyl tetracarboxylic dianhydride, 3,3 ', 4,4 '-benzophenone tetracarboxylic dianhydride, 2,2-two (3,4-dicarboxyl phenyl) propane dianhydride, 3,4,9, the 10-perylenetetracarboxylic dianhydride, two (3,4-dicarboxyl phenyl) propane dianhydride, 1,1-two (2,3-dicarboxyl phenyl) ethane dianhydride, 1,1-two (3,4-dicarboxyl phenyl) ethane dianhydride, two (2,3-dicarboxyl phenyl) methane dianhydride, two (3,4-dicarboxyl phenyl) ethane dianhydride, hydroxyl two O-phthalic acid dianhydrides, two (3,4-dicarboxyl phenyl) sulfone dianhydride, right-phenylene two (trimellitic acid monoesters acid anhydrides), ethylene (trimellitic acid monoesters acid anhydrides) and their analogue.They can use separately, and the mixture of also pressing arbitrary proportion uses.

Wherein, in the polyamic acid of the present invention as polyimide precursor, the acid dianhydride of suitable use is: pyromellitic acid dianhydride, 3,3 ', 4,4 '-benzophenone tetracarboxylic dianhydride, 3,3 ', 4,4 '-biphenyl tetracarboxylic dianhydride, right-phenylene two (trimellitic acid monoesters acid anhydrides), they can use separately, or press the mixture use of arbitrary proportion.

In the manufacturing of polyamic acid as polyimide precursor involved in the present invention, employed suitable diamine comprises: 4,4 '-diamino-diphenyl propane, 4,4 '-diaminodiphenyl-methane, p-diaminodiphenyl, 3,3 '-dichlorobenzidine, 4,4 '-diaminodiphenyl sulfide, 3,3 '-diaminodiphenylsulfone(DDS), 4,4 '-diaminodiphenylsulfone(DDS), 4,4 '-diaminodiphenyl oxide, 3,3 '-diaminodiphenyl oxide, 3,4 '-diaminodiphenyl oxide, 1, the 5-diaminonaphthalene, 4,4 '-diamino-diphenyl diethylsilane, 4,4 '-diamino-diphenyl silane, 4,4 ' diamino-diphenyl ethyl phosphine oxygen (phosphine oxide), 4,4 '-diamino-diphenyl N-methylamine, 4,4 ' diamino-diphenyl N-aniline, 1,4-diamino benzo (Ursol D), 1, the 3-diaminobenzene, 1, the 2-diaminobenzene, and their analogue, they can use separately, or press the mixture use of arbitrary proportion.

In these diamines, 4,4 '-diamino-diphenyl ether and Ursol D are good especially, the mixture that preferably uses the mixed with mol ratio 100: 0 to 0: 100 (100: 0 are better by 10: 90) to form when using them.

The solvent preferably that is used for synthesizing polyamides acid is an amide solvent, i.e. N, dinethylformamide, N, N-N,N-DIMETHYLACETAMIDE, N-N-methyl-2-2-pyrrolidone N-etc., N, dinethylformamide or N, the N-N,N-DIMETHYLACETAMIDE can use separately, or presses the mixture use of arbitrary proportion.

The concentration of polyamic acid solution is generally 5～35 weight %, is preferably 10～30 weight %.Concentration can obtain suitable molecular weight and soltion viscosity in this scope the time.

In addition, polyimide can make by the imidization as the polyamic acid of polyimide precursor, can use the arbitrary method in thermal curing method or the chemosetting method in the imidization.Thermal curing method is not work by dewatering agent or imidization catalyst etc. but only carry out the method for imidization reaction by heating.And the chemosetting method is by being the dewatering agent of representative with acid anhydrides such as diacetyl oxides and being the method that the imidization catalyst of representative works with tertiary amines such as isoquinoline 99.9, β-pyrroline, pyridines in polyamic acid organic solution.Also can and use chemosetting method and thermal curing method.The reaction conditions of imidization can change according to selection of kind, thickness, thermal curing method and/or the chemosetting method of polyamic acid etc.

When carrying out imidization by the chemosetting method, in the manufacturing of polyimide film involved in the present invention, dewatering agent in the polyamic acid solution adding, can exemplify aliphatic anhydride, aromatic anhydride, N, N-dialkyl group carbodiimide, lower aliphatic halogenide, halo lower aliphatic halogenide, halo lower aliphatic acid anhydrides, arylphosphonic acid dihalide, thionyl halide or two or more mixture in them.Wherein, use aliphatic anhydride such as diacetyl oxide, propionic anhydride, butyryl oxide or in them two or more mixture better.

For carrying out imidization effectively, in dewatering agent, use imidization catalyst better simultaneously.Available aliphatic tertiary amine, aromatic nitrile base, hetero ring type tertiary amine etc. are as imidization catalyst.Wherein, use the material that is selected from the hetero ring type tertiary amine good especially.Specifically there are quinoline, isoquinoline 99.9, β-pyrroline, pyridine etc. better.

In the manufacture method of polyimide film of the present invention, manufacturing process partly solidified and/or part exsiccant polyamide acid film (being also referred to as gel-film) can be carried out with known method.That is, with the organic solvent solution curtain coating of the polyamic acid of above-mentioned adjusting or be coated on the supporting masses such as sheet glass, ring-type stainless steel conduction band, stainless steel rotary drum, under the condition of heat, carry out imidization.Perhaps, in polyamic acid solution, sneak into dewatering agent and catalyzer at low temperatures,, make dewatering agent and imidization catalyst activation by heating then with this polyamic acid solution casting film-forming shape on supporting mass.Like this, by heat or chemical imidization, make the partly solidified polyamide acid film (gel-film) that has from supporting.And, used term " partly solidified " or " part is dry " in this specification sheets, its connotation be an amido linkage part contained in the polyamic acid solution at initial stage in the polyamic acid solution at imidization or initial stage a contained volatile constituent part through evaporation drying.This carries out partly solidified with all surfaces to film or the employed term of exsiccant implication is different.

Gel-film is the curing intermediate stage that is converted into polyimide by polyamic acid, and it has from supporting.The state of gel-film can characterize by residual volatile components contents and imidization rate.Residual volatile components contents and imidization rate can be calculated by following formula.

The residual volatile components contents is calculated by following formula:

(A-B) * 100/B ... formula (1)

(in the formula (1), A, B are defined as follows.

A: the weight of gel-film

B: gel-film is in the weight of 450 ℃ of heating after 20 minutes)

The imidization rate is calculated by formula 2 with infrared rays absorptiometric analysis method:

(C/D) * 100/ (E/F) ... formula (2)

(in the formula 2, C, D, E, F are defined as follows.

C: gel-film is at 1370 centimetres ^-1The absorption peak height at place

D: gel-film is at 1500 centimetres ^-1The absorption peak height at place

E: polyimide film is at 1370 centimetres ^-1The absorption peak height at place

F: polyimide film is at 1500 centimetres ^-1The absorption peak height at place)

Then, fix the two ends of gel-film width with pin or clip, be transported in the process furnace, drying is carried out heat treated after falling the volatile constituent of organic solvent etc., and this film becomes polyimide film.

An example of the manufacture method of polyimide film involved in the present invention below is described.

Term among the present invention " curtain stream " is meant that having mobile resin solution composition extrudes the blind-like article that has the gap that has air gap (air gap) when the back arrives conduction band from slit die.

The manufacture method of polyimide film involved in the present invention comprises: add solidifying agent in the organic solvent solution of aforementioned polyamic acid, described solidifying agent contains with respect to amido acid and is the dewatering agent more than 1 molar equivalent and is imidization catalyst below 0.2 molar equivalent with respect to amido acid, and the mol ratio of described dewatering agent and described imidization catalyst is 1: 0.15～1: 0.75, to make the resin solution composition thus and carry out casting film, thereby make polyimide film, can make mechanical properties by this method and not descend, and can prevent that resin molding is involved in bubble when curtain coating, the polyimide film that thickness deviation is improved.

Polyimide film is to form like this: the polyamic acid resin liquid that aforesaid method is made is extruded so that level and smooth film like curtain is streamed by slit die continuously with after solidifying agent mixes, and curtain coating is on the ring-type conduction band, and drying is cooled off formation and had gel-film from supporting.Again this gel-film is carried out heat treated, obtain having the polyimide film of required mechanical properties.

In addition, the consumption of dewatering agent is 1～5 molar equivalent with respect to amido acid, and 1.2～4 molar equivalents are better, and 1.5～3 molar equivalents are better.If its consumption is beyond this scope, chemical imidization rate will drop to below the OK range, can variation from the character that supporting mass breaks away from.

Catalyst consumption is 0.2～1.5 molar equivalent with respect to amido acid, and 0.25～1.2 molar equivalent is better, and 0.3～1 molar equivalent is better.If its consumption is beyond this scope, chemical imidization rate will drop to below the OK range, can variation from the character that supporting mass breaks away from.

The consumption of these dewatering agents and imidization catalyst satisfies above-mentioned OK range, and can mol ratio 1: 0.15～1: 0.75, be preferably 1: 0.2～1: 0.7 ratio uses.The consumption of imidization catalyst is during less than 0.15 mole with respect to 1 mole of dewatering agent, and chemical amidation can not be carried out fully, and this is the reason that causes strength degradation, thereby makes that film is difficult to break away from from supporting mass.And the consumption of imidization catalyst with respect to 1 mole of dewatering agent above 0.75 o'clock, curing speed has the tendency of quickening, the part imidization then takes place on resin molding, produce gluey defective on the film, thereby cause part imidization jelly to stop up the slit die head easily and can not carry out the problem of painting process.

In addition, the curing dose that adds in 100 parts of polyamic acid solutions is 30～80 parts, and 35～75 parts better, and 35～70 parts better.The add-on of solidifying agent is during less than 30 parts, and the viscosity that adds the resin solution composition that forms behind the solidifying agent can raise, thereby is involved in bubble, causes phenomenons such as thickness deviation increase easily.And the add-on of solidifying agent is when surpassing 80 parts, and the dry required time increases, and productivity is descended, and the usage quantity of solvent increases, so there are problems such as cost uprises.

Better, 400 pools are following better below 600 pools for the viscosity that adds the resin solution composition that forms behind the solidifying agent, the rotary viscosity of measuring with Brookfield viscometer in the time of 0 ℃.When the viscosity that adds the resin solution composition that forms behind the solidifying agent is higher than 600 pools, when keeping high productivity, cause easily thickness deviation increase, be involved in problem such as increasing of bubbles volume.

Another example of the manufacture method of polyimide film of the present invention is to comprise with above-mentioned gel-film being that polyamide acid film impregnated in tertiary amine or the ertiary amine solution, perhaps the manufacture method of the operation of coating tertiary amine or ertiary amine solution on polyamide acid film.That is the method that, comprises following operation:

With the organic solvent solution curtain coating of polyamic acid or be coated on after drying on the supporting mass, make operation partly solidified and/or part exsiccant polyamide acid film,

Impregnated in this polyamide acid film in tertiary amine or the ertiary amine solution or on polyamide acid film the operation of coating tertiary amine or ertiary amine solution,

Making polyamic acid afterwards is the operation of polyimide, also dry this film through imidization.

In the method, the also available chemosetting method of the imidization of polyamic acid, in this case, the consumption of dewatering agent is 0.5～5 times of amount of amido acid mole number in the polyamic acid solution, and 1～4 times of amount is better, and 1.5～3 times are better.

The consumption of imidization catalyst is 0.1～2 times of amido acid mole number in the polyamic acid solution, and 0.2～1 times better.This scope of its amount ratio hour, the imidization rate has the tendency that becomes less than OK range, this scope of its amount ratio is solidified and is accelerated for a long time, thus on supporting mass the curtain coating difficulty that becomes.

The residual volatile component concentration of gel-film is in 5～500% scope, and is 5～100% better, 10～80% better, best 30～60%.It is suitable using the film in this scope, and not too can present unwanted effect.And the imidization rate of colloidal mill is in the scope more than 50%, and is 80% better, 85% better, best 90%.It is suitable using the film in this scope, as the outer film of use range, then is difficult to the effect that obtains setting.

Adopt the manufacture method of polyimide film of the present invention, can obtain volatile constituent content, the gel-film of imidization rate in above-mentioned scope, the manufacturing time of its gel-film can shorten 10～70% than gel-film manufacturing time so far, even 20～70%.

Described below is coating tertiary amine or ertiary amine solution or described partly solidified and/or part exsiccant polyamide acid film be impregnated in the operation of tertiary amine or ertiary amine solution on the partly solidified and/or part exsiccant polyamide acid film that is obtained by above-mentioned thermal curing method or chemosetting method.

As being used for coating or flooding tertiary amine partly solidified and/or part exsiccant polyamide acid film (gel-film), available aliphatic tertiary amine, aromatic nitrile base, hetero ring type tertiary amine etc.Wherein, use the tertiary amine that is selected from the hetero ring type tertiary amine good especially.Concrete used quinoline, isoquinoline 99.9, β-pyrroline, pyridine etc.These tertiary amines can use separately, also can be used as two or more mixtures and use.Also can be used as organic solvent solution, also harmless with solvent cut in this case, amide solvent is N, dinethylformamide, N, N-N,N-DIMETHYLACETAMIDE, N-N-methyl-2-2-pyrrolidone N-, N wherein, dinethylformamide or N,N-dimethylacetamide can be used separately or use by the mixture of arbitrary proportion.When use the dilution back, can adopt any concentration, be preferably use and be mixed with the solution that tertiary amine concentration is 100～5 weight %.If use excessive rarefied solution, reducing effect as the inhibition strength of one of the object of the invention will diminish.

The method of coating tertiary amine or ertiary amine solution on gel-film, the known method that available practitioner uses, for example use the method for intaglio plate coating machine, spraying machine, knife coater coating, from the control and the homogeneity viewpoint of glue spread, wherein the intaglio plate coating method is good especially.Glue spread is 1 gram/rice ²More than to 40 gram/rice ²Better, at 5 gram/rice ²More than to 30 gram/rice ²Better.Glue spread is than this scope hour, the inhibition strength difficulty that becomes that descends.Than this scope for a long time, the outward appearance of film can variation.

And under the situation that impregnated in tertiary amine or ertiary amine solution, have no particular limits, adopt the dipping method usually.Specifically, be in the groove of above-mentioned solution is housed, to flood gel-film continuously or off and on.Dipping time be more than 1 second to 100 seconds, be preferably 1～20 second.When dipping time was longer than this scope, the outward appearance of film can variation, dipping time too in short-term, the inhibition strength difficulty that becomes that descends.

After coating of tertiary amine or ertiary amine solution or dipping gel-film, also can increase operation, because can obtain not producing on the film surface polyimide film of the outward appearance excellence of non-uniform phenomenon like this except that the residual droplets on striping surface.Drop remove available roll (nip roller) squeeze liquid, with air doctor blade (air knife), scraper plate (doctorblade), wiping, known method such as blot, from the outward appearance of film, except that viewpoints such as fluidity and operability, better with the method for roll pressed.

As mentioned above, be coated with or flooded the gel-film of tertiary amine or ertiary amine solution, with its end fixing shrink when preventing to solidify after, carry out heating process.Remove moisture, residual solvent in the gel-film.Remaining transforming agent and catalyzer, the amido acid that makes imidization not is imidization fully, thereby obtains polyimide film.The temperature condition of this drying process is preferably in the scope internal heating 1～400 second that finally is warming up to 500～580 ℃.When temperature is longer than this temperature height and/or heat-up time, can produce the problem of film generation thermal degradation when.Low and/or heat-up time can not present the effect of setting in short-term and temperature is than this temperature.

The polyimide film of making by the manufacture method of above-mentioned polyimide film of the present invention, even shortened the manufacturing time of gel-film, the polyimide film of the required physical strength that also can be maintained.Therefore, can boost productivity the polyimide film that the decline that obtains tear propagation strength and bond strength is prevented, tensile strength is improved by shortening the manufacturing time of gel-film.

Polyimide film involved in the present invention can be used as flexible base plate preferably, be generally used for passive film (passivation film) of semiconductor elements such as the tape of magnetic recording etc., disk, solar cell etc.

The following describes the another example of the manufacture method of polyimide film of the present invention.

This manufacture method is under the residual state that volatile constituent arranged of control gel-film to be peeled from supporting mass, makes this film continue the method for imidization, that is,

The manufacture method of polyimide film of the present invention comprises: sneak into dewatering agent and imidization catalyst in the organic solvent solution of above-mentioned polyamic acid after, with its curtain coating on supporting mass, after heating, gel-film is peeled from supporting mass under the residual state that volatile constituent arranged, catalyzer is more than 50 weight parts when obtaining the residual volatile component and being 100 weight parts, solvent is below 30 weight parts, and dewatering agent and/or from the partly solidified and/or part exsiccant polyamide acid film of component below 20 weight parts of dewatering agent, make remaining amido acid continue imidization, and dry this film.

Dewatering agent is with respect to the add-on of polyamic acid solution, can suitably determine according to the concentration of polyamic acid in the solution, the density at amido acid key position in the polyamic acid molecule, for example in pyromellitic acid acid anhydride and 4, the concentration that 4 '-diamino-diphenyl ether constitutes is under the situation of polyamic acid of 18.5 weight %, with respect to 100 weight parts of polyamide acid solutions, the consumption of dewatering agent is 1～80 part, and 5～70 parts better, and 10～50 parts better.Cause easily when its consumption is too much that mixing is bad, the carrying out (curing) of chemistry imidization has the tendency that latens when very few.

Imidization catalyst is with respect to the add-on of polyamic acid solution, can suitably determine according to the density at the concentration of polyamic acid in the solution and the amido acid key position in the polyamic acid molecule, for example in pyromellitic acid acid anhydride and 4, the concentration that 4 '-diamino-diphenyl ether constitutes is under the situation of polyamic acid of 18.5 weight %, with respect to 100 weight parts of polyamide acid solutions, catalyst consumption is 0.1～30 part, and 0.5～20 part better, and 1～15 part better.The chemistry imidization became and is difficult to carry out (curing) when its consumption was very few, and the carrying out (curing) of chemistry imidization accelerates in the time of too much, thereby is difficult to curtain coating on supporting mass.

In in polyamic acid solution, sneaking into dewatering agent and imidization catalyst under the low temperature, then on supporting masses such as sheet glass, aluminium foil, ring-type stainless steel conduction band, stainless steel rotary drum, form this polyamic acid solution curtain coating membranaceous, 80～200 ℃, be preferably in 100～180 ℃ the temperature province and heat, so that dewatering agent and catalyst activation, after partly solidified and/or part drying, this film is peeled from supporting mass, obtain gel-film.

The residual volatile component concentration of gel-film is in the scope of 5～500 weight %, and 10～200 weight % are better, and 10～80 weight % are better, 30～60 weight % are best.With the film in this scope is suitable, thus this can the residual volatile component concentration in fact the standard below 100 weight % make better.As exceed that above-mentioned scope just is difficult to obtain setting effect.

In addition, the heating condition of this moment can use following condition: after the above-mentioned gel-film that makes shakes in the N-N-methyl-2-2-pyrrolidone N-and flooded simultaneously in 48 hours, come the catalyzer remaining in the quantitative gel-film and the content of primary solvent by gas chromatography determination, its content is: catalyzer was better more than 50 weight parts, more than 60 weight parts, better more than 70 weight parts when total residual volatile component was 100 weight parts (but not considering water content) in the gel-film; Solvent is better below 30 weight parts, below 25 weight parts, better below 20 weight parts; And dewatering agent and/or from the component of dewatering agent below 20 weight parts, below 15 weight parts better, better below 10 weight parts.Specifically, comprise the variation, hot blast change of wind velocity, the variation of heat-up time, supporting mass variation of temperature etc. of variation, the hot blast rate of variation, the drying temperature of primary solvent and catalyst weight ratio.These conditions can wait according to the kind of the thickness of the add-on of the boiling point of catalyzer and main catalyzer, catalyzer, film, polyamic acid and production rate and change.

Catalyzer, solvent, dewatering agent and/or when the components contents of dewatering agent is outside above-mentioned scope are difficult to reach simultaneously the purpose that the present invention boosts productivity and inhibition strength descends.

The end of above-mentioned gel-film is heated after fixing, make the remaining complete imidization of amido acid, by manufacture method of the present invention can obtain making that productivity is improved, the polyimide film that decline is prevented, tensile strength is improved of tear propagation strength and bond strength.

At this moment, being preferably in finally is to heat 15～400 seconds under 500～580 ℃ the temperature.When longer, can cause the problem of film generation thermal degradation when than this temperature height and/or heat-up time.Low and/or heat-up time just can not present the effect that sets in short-term and than this temperature.

And the polyimide film that obtains thus is by following formula (3):

(loss on heating rate)=(X-Y)/Y ... formula (3)

X: in the film quality of 150 ℃ of heating after 10 minutes

Y: in the film quality of 450 ℃ of heating after 20 minutes

The loss on heating rate that calculates is 0.2～2.5 weight %, 0.3～2.0 weight % are better, 0.3～1.5 weight % are better, 0.5～1.5 weight % are best, and catalyzer accounts for more than the 0.01 weight % of film gross weight in the thermosteresis component, and 0.05 weight % is better above, and 0.1 weight part % is above best, in order to make loss on heating rate and loss on heating component in above-mentioned scope, in whole heating phases of this manufacture method, regulate Heating temperature and be advisable heat-up time.If loss on heating rate and loss on heating component exceed beyond the above-mentioned scope, just can not get the effect that sets.

The measuring method of loss on heating is as follows.That is, play this film, in 150 ℃ of heating 10 minutes with the Aluminium Foil Package of measuring tare weight.During through 10 minutes it is taken out from baking oven, move on to rapidly in the moisture eliminator (desiccator).Cool off after 2 minutes, symphysis is weighed together with aluminium foil, the weight of deducting aluminium foil tare weight gained is decided to be initial weight X.After having measured initial weight X, then in 450 ℃ of heating 20 minutes.During through 20 minutes it is taken out from baking oven, move on in the moisture eliminator rapidly.Cool off after 2 minutes, weigh, the weight of deduction aluminium foil tare weight gained is decided to be weight Y after the heating together with aluminium foil.In this mensuration, in order to make film moisture absorption immediately, all operation all must be carried out apace.

The following describes the another example of the manufacture method of polyimide film of the present invention.This manufacture method comprises following operation: the polyamic acid composition curtain coating on supporting mass, is heated with at least 2 temperature standards the polyamic acid composition on the supporting mass, promptly continuously

The manufacture method of polyimide film of the present invention comprises: sneak in the organic solvent solution of above-mentioned polyamic acid after dewatering agent and the imidization catalyst, with the polyamic acid composition curtain coating of gained on supporting mass, after at least 2 above temperature stages heating of this supporting mass usefulness, this film is peeled from supporting mass, obtain partly solidified and/or part exsiccant polyamide acid film, make remaining amido acid imidization afterwards, and dry this film.

The consumption of dewatering agent is 1～80 part with respect to 100 parts of polyamic acid solutions, and 5～70 parts better, and 10～50 parts better.When its consumption was very few, the imidization rate had the tendency littler than OK range, solidified when too many and accelerated, thereby be difficult to curtain coating on supporting mass.

The consumption of imidization catalyst is 0.1～30 part with respect to 100 parts of polyamic acid solutions, and 0.5～20 part better, and 1～15 part better.When its consumption was very few, the imidization rate had the tendency littler than OK range, solidified when too many to accelerate, thereby was difficult to curtain coating on supporting mass.

In in polyamic acid solution, sneaking into dewatering agent and imidization catalyst under the low temperature, the polyamic acid composition curtain coating that then will obtain thus is on supporting masses such as sheet glass, aluminium foil, ring-type stainless steel conduction band, stainless steel rotary drum, form membranaceous, 80～200 ℃, better be in 100～180 ℃ the temperature province with at least 2 temperature standards stage by stage to this supporting mass heating, so that dewatering agent and catalyst activation, thereby through partly solidified and/or dry after, film is peeled from supporting mass, obtain gel-film.

The volatile constituent content of gel-film is in 5～500% scope, and 5～100% is better, and 10～80% is better, and 30～60% is best.It is suitable using the film in this scope, as exceed that above-mentioned scope just is difficult to obtain setting effect.

When heating stage by stage with at least 2 temperature standards, the initial heating phase 80 ℃～160 ℃, better be that 100 ℃～140 ℃ temperature province internal heating is advisable.At this moment, if the temperature T in the 1st stage 1 is crossed the tendency that volatile constituent content low then in the gel-film just has increase, if evaporation rate too high then dewatering agent and catalyzer accelerate, thereby make the difficulty that becomes of chemical imidization.

And, when heating stage by stage with at least 2 temperature stages, the last heating phase 120～200 ℃, better be that 140～180 ℃ temperature province internal heating is advisable.If this temperature T 2 is low excessively, then the volatile constituent content in the gel-film just has the tendency of increase, for temperature is controlled in the OK range, needs to prolong heat-up time, promptly thereby reduce productivity.And if temperature T 2 is too high, then the volatile constituent content in the gel-film becomes littler than OK range easily, and this just is difficult to the effect that obtains setting.

In addition, when heating stage by stage with 3 above temperature standards, the middle heating phase except that initial and final heating stage, 80～200 ℃, better be that 100～180 ℃ temperature province internal heating is advisable.

And when heating stage by stage, in the initial stage of heating, while must under the volatilization that suppresses dewatering agent and catalyzer makes the state of dewatering agent and catalyst activation, be cured with at least 2 temperature standards; Must carry out drying during the late stages of developmet, so preferably improve Heating temperature along with the carrying out of heating phase.

The range of temperature of the temperature T 1 in above-mentioned the 1st stage is preferably-10 ℃～+ 10 ℃, more preferably-5 ℃～+ 5 ℃.Equally, the range of temperature of the temperature T 2 of terminal stage is preferably-10 ℃～+ 10 ℃, more preferably-5 ℃～+ 5 ℃.When heating under the temperature more than the 3rd stage of carrying out where necessary, also adopt same range of temperature.

For shortening the production time, after temperature T 1 heating, be warming up to temperature T 2 at short notice and be advisable.

Avoiding by the gel-film of above-mentioned gained under the state that fixedly shrink during after fixing the end, carry out drying, remove anhydrate, residual solvent, remaining transforming agent and catalyzer, make the remaining complete imidization of amido acid then, by manufacture method of the present invention obtain that productivity is improved, the polyimide film that decline is prevented, tensile strength is improved of tear propagation strength and bond strength.

At this moment, being preferably in finally is to heat 5～400 seconds under 500～580 ℃ the temperature.When longer, can cause the problem of film generation thermal degradation when than this temperature height and/or heat-up time.Low and/or heat-up time just can not present the effect that sets in short-term and than this temperature.

In addition, the loss on heating rate that calculated by following formula (3) of the polyimide film of gained is 0.2～2.5 weight % thus, be preferably 0.3～2.0 weight %, 0.3～1.5 weight % more preferably, be preferably 0.5～1.5 weight %, and catalyzer accounts for more than the 0.01 weight % of film gross weight in the loss on heating component, be preferably more than 0.05 weight %, be more preferably more than 0.1 weight %, in order to make loss on heating rate and loss on heating component in above-mentioned scope, regulate Heating temperature in the whole heating phases in this manufacture method and be advisable heat-up time.If the effect that loss on heating rate and loss on heating component can exceed above-mentioned scope or just can not get setting.

In addition, polyimide film of the present invention fabric width during fabrication is more than 1 meter, the maximum value of the tear propagation strength that records along total width and the ratio of minimum value are more than 0.7, and the R value when measuring the tear propagation strength of end is when 0.6g is following, end thorough roasting, and little with the roasting inequality of central part.

The ratio of the maximum value of tear propagation strength herein and minimum value more than 0.7 better, 0.75 or more better, also to get well more than 0.80.Optimum calcination temperature can be according to the kind of polyimide and different, but appropriate change, resets, but tear propagation strength has the tendency of increase under the situation of underroasting usually, under the situation of crossing roasting the tendency that reduces is arranged.Therefore, the maximum value of tear propagation strength and minimum value such as the fruit less than 0.7, then rerum natura can present mostly along the remarkable variation of width.The maximum value of the tear propagation strength of measuring along total width and the ratio of minimum value with 10 centimetres interval sampling, are measured the tear propagation strength of these sampling points according to ASTM D-1938 on the width of film, obtain (minimum value)/ratio of (maximum value).

And, the R value when wishing to measure the tear propagation strength of end below 0.6g, below 0.4g better, below 0.3g better.If this value surpasses 0.6g, then the situation of underroasting or mistake roasting is a lot.R value when measuring the tear propagation strength of end is to be the sample of 7.5 centimetres of 2.5 cm x taked of basic point with inboard 10 millimeters from fixed positions such as pin, clips to film position, the value that the difference of maximum value and minimum value was tried to achieve during this sample was measured.

Polyimide film of the present invention is for example obtained by following method: add solidifying agent in the organic solvent solution of polyamic acid, it is the dewatering agent and the imidization catalyst more than 0.3 molar equivalent of 1.0～3.0 molar equivalents that described solidifying agent contains with respect to amido acid, with the resin solution casting method film forming that forms thus.

Dewatering agent is 1.0～3.0 molar equivalents with respect to amido acid, is preferably 1.5～2.5 molar equivalents, and imidization catalyst is more than 0.3 molar equivalent with respect to amido acid, is preferably more than 0.4 molar equivalent.If the consumption of dewatering agent is beyond OK range, the various characteristics of polyimide film can descend.And if imidization catalyst is very few, chemical imidization is just insufficient.The various characteristics of the polyimide film that makes has the tendency of reduction.

Polyimide film is obtained better by following method: the polyamic acid resin liquid that will be obtained by aforesaid method is with after solidifying agent mixes, extrude continuously so that level and smooth film like curtain is streamed from slit die, curtain coating is on supporting masses such as stainless steel rotary drum or ring-type conduction band, 80～200 ℃, better be on supporting mass, to heat in 100～180 ℃ the temperature province, so that dewatering agent and imidization catalyst activation, through partly solidified and/or dry after, film is peeled from supporting mass, obtain gel-film.

The residual volatile component concentration of gel-film is preferably 5～100 weight % in the scope of 5～500 weight %, more preferably 10～80 weight %, be preferably 30～60 weight %.With the film in this scope is suitable, if beyond this scope, then is difficult to obtain having the film of excellent mechanical strength.

Avoiding by the gel-film of above-mentioned gained under the state that fixedly shrink during after fixing the end, carry out drying, remove anhydrate, residual solvent, remaining transforming agent and catalyzer, make the remaining complete imidization of amido acid then, can obtain mechanical characteristics of the present invention at the little polyimide film of total width upper variation of tolerance.

At this moment, being preferably in finally is to heat 5～400 seconds under 500～580 ℃ the temperature.When longer, cause the thermal degradation when of film easily, thereby the increase of width roasting inequality often takes place than this temperature height and/or heat-up time.

The following describes the another example of polyimide film of the present invention.

Polyimide film of the present invention can be more than 1250 millimeters the wide production of film, the degree of molecular orientation MOR-c at any position is below 1.30 in the film, modulus in tension is below the above 5.0GPa of 2.5GPa.

Such film is for example made by following method: the polyamic acid mixing solutions curtain coating that will be made of polyamic acid, dewatering agent, imidization catalyst and organic solvent is on supporting mass, form partly solidified and/or be dried to the film (hereinafter referred to as gel-film) that has from supporting, process furnace is passed through after fixing in the two ends of this gel-film, thereby make polyimide film, in this method

(1) described polyamic acid mixing solutions, being mixed with respect to the amido acid unit is 1.0～5.0 normal dewatering agents and 0.2～2.0 normal imidization catalyst, and

The add-on of dewatering agent, being restricted to minimal viewpoint from the contraction that supporting mass is in the film of heating/drying stage considers, the amido acid unit that is mixed with respect to polyamic acid is that 1.0～5.0 equivalents are better, and 2.0～4.0 equivalents are better, and 1.5～3.0 equivalents preferably back add.If beyond this scope, just can not obtain the good film of isotropy, and if less than 1.0 scopes, then imidization can not fully carry out, thereby can not get the gel-film of sufficient intensity.Gel-film is peeled the difficulty that also becomes from supporting mass.And surpass at 5.0 o'clock, and the imidization of polyamic acid is accelerated, thereby has damaged the suitable binding property of gel-film and supporting mass, and gel-film has the tendency of shrinking on supporting mass.

The add-on of imidization catalyst is preferably 0.1～2.0 equivalent with respect to the amido acid unit of polyamic acid, and more preferably 0.3～1.5 equivalent is preferably 0.5～1.0 equivalent.

The amount of imidization catalyst surpasses at 2.0 o'clock, and the imidization of polyamic acid can be accelerated, on the supporting mass or with polyamic acid mixing process in the part imidization can take place, on film, produce gluey defective.And gluey defect object can be stopped up slit die, thereby has the tendency that produces the strip defective.And less than 0.1 o'clock, the cure/dry on the supporting mass just can not be carried out fully, thereby had the tendency that causes strength degradation.

The polyamic acid mixing solutions that dewatering agent and imidization catalyst are mixed into by above-mentioned OK range forms membranaceous on supporting masses such as the metal rotary drum of rotation, ring-type conduction band through the slit die curtain coating, undertaken partly solidifiedly and/or dry by heating on supporting mass, obtain having gel-film from supporting.To polyamic acid mixing solutions when heating of curtain coating on supporting mass, can supply hot blast or the far infrared wire spoke is penetrated heat.Perhaps, also can be to the direct heating of supporting mass own.Supply hot blast or far infrared wire spoke can also be penetrated hot mode and the direct-fired mode of supporting mass is combined.

The imidization rate of this moment is preferably more than 80% more than 50%, is preferably more than 90%.Above-mentioned " part imidization " is with at this scope intrinsic displacement, if the situation that sets effect will occur being difficult to present beyond this scope.

And the scope of residual volatile component concentration is 15～300%, 15～150% better, and 30～80% is better, and 30～60% is best.It is suitable using the gel-film of residual volatile component concentration in this scope, when less than this scope the film on the supporting mass being heated, then not only carries out imidization and drying, also can carry out thermal degradation when, and the polyimide film of gained is difficult to the intensity that keeps enough.And when surpassing this scope, the situation of infringement productivity such as film rupture can take place in follow-up heating process.

Afterwards, the two ends with pin or clip etc. is clamped the width of gel-film are transported to it in process furnace, and drying is heat-treated after falling volatile constituents such as organic solvent, becomes polyimide film.Process furnace can adopt the structure that heats up continuously along with transporting, also can adopt the structure that heats up stage by stage, both do not have difference in essence, under any circumstance, its heating starting temperature all is preferably in below atmosphere temperature+100 ℃ on the above-mentioned supporting mass, and is better below the atmosphere temperature on the supporting mass+80 ℃.And importantly be controlled at 150～250 ℃, be more preferably in 180～200 ℃ the scope.The temperature head of supporting mass and process furnace can not get the good film of isotropy beyond this scope the time.And the heating starting temperature is beyond this OK range the time, and contained volatile constituent produces the foaming defective because of bumping on the film surface in gel-film, thus the smoothness of infringement film.

Then, through finally being 450 ℃～580 ℃, better being to heat 15～40 seconds heating process under 500～580 ℃ the temperature, thereby constituted the manufacture method of polyimide film of the present invention.

Among the present invention, what is called can be meant and can make film by process furnace with the fabric width more than 1250 millimeters with the film of the production of the fabric width more than 1250 millimeters.Though can present significant effect in the operation with wide like this fabric width manufacturing film, the film of gained can be cut into required width certainly.

The isotropy polyimide film of making thus, the anisotropy of the molecular orientation of any is little arbitrarily on the width.That is, on the width arbitrarily the degree of molecular orientation MOR-c value of any better be below 1.2 below 1.3, can be with characteristics such as Young's modulus, tension stress, linear expansivitys along the difference limit of mensuration direction to inferior limit.This film can be applicable to well that the flexible printed circuit of the laminated tinsel that requires to have extra high dimensional stability or metallic film or TAB are with carrier band or flexible circuit board covering layer film.

The following describes the another example of making polyimide film of the present invention.

Used polyamic acid is normally following among the present invention makes: will at least a aromatic series dianhydride and at least a aromatic diamine of equimolar amount are dissolved in the organic solvent basically, under controlled temperature condition, stir the polyamic acid organic solution of gained, finish until the polymerization of above-mentioned acid dianhydride and diamine.The concentration of this polyamic acid solution is generally 15～25 weight %.Concentration can obtain suitable molecular weight and soltion viscosity in this scope the time.

In addition, the imidization among the present invention can adopt the chemosetting method suitably.

Described diamine in this example can be also with 4, and 4-diamino-diphenyl ether and Ursol D are better.Particularly in order to improve the same low linear expansion coefficient of Young's modulus and realization and metal, it is better following that the consumption of Ursol D accounts for the above 65 moles of % of 20 moles of % of whole diamines, and 25 moles more than the % 50 moles better below the %.If less than this scope, will can not get effect of the present invention.And if above this scope, it is too little that linear expansivity can become, can not be applicable to that then metal level is through adhesive laminated or the direct laminated purposes such as flexible printed circuit that form.

In this example, the consumption of above-mentioned dewatering agent is 1～80 part with respect to the organic solvent solution of 100 parts of polyamic acids, and 5～70 parts better, and 10～50 parts better.

In this example, the consumption of above-mentioned imidization catalyst is 0.1～30 part with respect to 100 parts of polyamic acid organic solutions, and 0.5～20 part better, and 1～15 part better.If very little, then the imidization rate can be littler than OK range, if too much then solidify to accelerate, thereby is difficult to curtain coating on supporting mass.

In this example, the imidization rate of being calculated by above-mentioned formula (2) is more than 50%, and is better, best more than 80% more than 70%.Above-mentioned " part imidization " is advisable in this scope.If less than this scope, can produce and be difficult to gel-film is peeled or from the problematic situation of supporting from supporting mass.

In addition, in this example, the residual volatile component concentration of the gel-film of being calculated by following formula (1) is in 50～300% scope, and 80～250% is better, and 100～200% is best.It is suitable using the film in this scope, if use the residual volatile component concentration gel-film higher than this scope, then can lack from supporting, can break because of stretching when probably gel-film being transported to process furnace, thereby can not stably produce.And if the use residual volatile component concentration gel-film lower than this scope then can be difficult to present the effect that sets.

And, remove (drying) residual solvent, finish curing (imidization) simultaneously by heating above-mentioned gel-film, but, the end of gel-film need be fixed on the expanding frame (tenter flame) with pin or clip etc. to be transported in the process furnace in order to prevent that gel-film dry and when solidifying from shrinking.At this moment, the initial temperature in the above-mentioned process furnace be 200～400 ℃ better, 250～350 ℃ scope, just more can give play to the effect that sets as further.If in the temperature range higher, then because sharply heating film can be in the stove implosion than said temperature.Perhaps, probably can produce the blister defective from the teeth outwards because of the volatile constituent bumping of remnants such as solvent.If in the temperature range lower, then be difficult to present the effect that sets than said temperature.

As mentioned above, the inventor finds that the residual volatile component concentration of gel-film and the initial temperature of expanding process furnace are set and be controlled in the specified range, can be for finally the Young's modulus and the linear expansivity of the polyimide film of gained directly bring effect.And, to break with the film surface blister, under the situation of not damaging productivity, bring into play these effects most effectively for fear of gel-film, concrete span of control is as follows.

When the residual volatile component concentration in the residual volatile component concentration of above-mentioned OK range is low, promptly at 50～150 weight %, be more preferably 80～150 weight %, preferably during the scope of 100～150 weight %, initial temperature in the expanding process furnace is set at 250～400 ℃ and is advisable, be preferably 300～400 ℃, be preferably 350～400 ℃.Therefore this moment, the residual volatile component of gel-film was few, from the supporting excellence, not too can produce breaking or the bumping of residual volatile component of film, so the initial stage temperature of expanding process furnace can be established height.

On the other hand, when the residual volatile component concentration in the residual volatile component concentration of above-mentioned OK range is higher, promptly at 150～300 weight %, be more preferably 150～250 weight %, preferably during the scope of 150～200 weight %, initial temperature in the expanding process furnace is set at 200～350 ℃ and is advisable, be preferably 200～300 ℃, be preferably 200～250 ℃.This moment, the residual volatile component of gel-film was many, from the supporting variation, so in order to obtain effect of the present invention under the situation about not descending in productivity, the initial temperature of expanding process furnace can be set in lower scope in the above-mentioned OK range.

The residual volatile component concentration of gel-film can wait according to heat-up time of the kind of polyimide resin, thickness, used solvent, supporting mass and heating efficiency and control, in a word, the residual volatile component concentration is controlled in the above-mentioned OK range, just can determines the initial temperature in the expanding process furnace.

Afterwards, through finally being 450～600 ℃, better being to heat 15～400 seconds operation under 500～600 ℃ the temperature, constituted the manufacture method of polyimide film involved in the present invention.This process furnace can adopt continuously (not stage by stage) to be warming up to above-mentioned suitable temperature range, be the so-called structure of high maturing temperature, also can adopt the structure that heats up stage by stage, both are as broad as long in essence, importantly under any circumstance heat initial temperature and all are set in the above-mentioned OK range.

By on the polyimide film made compare with the polyimide film of making by other film-forming method with same materials (polyamic acid as precursor is identical), degree of birefringence is big, can reach snappiness and low linear expansion coefficient.For example, can obtain degree of birefringence at the polyimide film more than 0.15.More particularly, by method of the present invention, can make Young's modulus in 1.0GPa, linear expansivity be in 4ppm with not damaging productivity.Therefore, by the present invention, can make and be applicable to the conduct polyimide film of the basement membrane of basement membrane, covering layer film or the TAB usefulness carrier band of the flexible printed circuit of high-accuracyization day by day.

Below exemplify embodiment and specify effect of the present invention, but the present invention is not limited to these embodiment, the practitioner can make various changes, correction and change under the condition that does not deviate from the scope of the invention.

The tear propagation strength of polyimide film is measured according to ASTM D 1938, and tensile strength is measured according to JIS C-2318.

Bond strength is that (mining company of Mitsui Metal Co., Ltd. makes with electrolytic copper foil by being tackiness agent with nylon epoxy, trade(brand)name 3ECVLP, thickness is 35 microns) bonding with polyimide film, make 3 layers of copper foil covered plywood, according to JIS C-6481, be to peel with 90 degree under 3 millimeters the condition to estimate at the pattern width of copper.

The temperature condition of the heating process of gel-film is all identical in comparative example and embodiment.

Comparative example 1

With pyromellitic acid dianhydride/4,4 '-diamino-diphenyl ether/Ursol D is with 4/3/1 mol ratio synthesizing polyamides acid.This polyamic acid is modulated into the DMF that its content is 18.5 weight % (dimethyl formamide) solution 100 grams, be mixed into the transforming agent that constitutes by 35 gram diacetyl oxides and 5 gram β-pyrrolines, after stirring, centrifugation deaeration, its curtain coating on aluminium foil is coated with into 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.Heated 150 seconds with 120 ℃ of laminaties, obtain having gel-film from supporting to this aluminium foil and polyamic acid solution.The residual volatile component concentration of this gel-film is 41 weight %, and the imidization rate is 81%.This gel-film is peeled from aluminium foil, fix on the top of the shelf.This gel-film was respectively heated 30 seconds during respectively at 300 ℃, 400 ℃, 500 ℃, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 1.

Comparative example 2

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 1, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 36 weight %, and the imidization rate is 78%.The basic mechanical characteristics of this polyimide film is as shown in table 1.

Comparative example 3

Except the molar ratio with 1/1 uses pyromellitic acid dianhydride/4, beyond 4 '-diamino-diphenyl ether, all the other are identical with comparative example 1, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 40 weight %, and the imidization rate is 89%.The tear propagation strength of this polyimide film is as shown in table 1.

Comparative example 4

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 3, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 38 weight %, and the imidization rate is 87%.The basic mechanical characteristics of this polyimide film is as shown in table 1.

Comparative example 1 is compared with 2 and comparative example 3 is compared with 4, if shorten the manufacturing time of gel-film, physical strengths such as tear propagation strength, tensile strength, bond strength all demonstrate decline.

Embodiment 1

Making the residual volatile component concentration in the same manner with comparative example 2 is 48 weight %, and the imidization rate is 78% gel-film.This gel-film be impregnated in the isoquinoline 99.9, remove unnecessary drop by roll after, under 300 ℃, 400 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is shown in table 1.

Embodiment 2

Making the residual volatile component concentration in the same manner with comparative example 2 is 53 weight %, and the imidization rate is 78% gel-film.This gel-film be impregnated in the 35 weight %DMF solution of isoquinoline 99.9,, under the condition identical, heat, make the polyimide film of 25 micron thickness with comparative example 2 by after being blown into pressurized air and removing unnecessary drop.The basic mechanical characteristics of this polyimide film is shown in table 1.

Embodiment 3

Making the residual volatile component concentration in the same manner with comparative example 4 is 49 weight %, and the imidization rate is 87% gel-film.This gel-film be impregnated in the isoquinoline 99.9,, under the condition identical, heat, make the polyimide film of 25 micron thickness with comparative example 4 by after being blown into pressurized air and removing unnecessary drop.The basic mechanical characteristics of this polyimide film is shown in table 1.

Embodiment 4

Making the residual volatile component concentration in the same manner with comparative example 4 is 52 weight %, and the imidization rate is 87% gel-film.This gel-film be impregnated in the 35 weight %DMF solution of isoquinoline 99.9,, under the condition identical, heat, make polyimide film with comparative example 2 by after being blown into pressurized air and removing unnecessary drop.The basic mechanical characteristics of this polyimide film is shown in table 1.

Embodiment 5

Making the residual volatile component concentration in the same manner with comparative example 4 is 51 weight %, and the imidization rate is 85% gel-film.This gel-film be impregnated in β-pyrroline,, under the condition identical, heat, make polyimide film with comparative example 2 by after being blown into pressurized air and removing unnecessary drop.The basic mechanical characteristics of this polyimide film is shown in table 1.

Embodiment 6

With pyromellitic acid dianhydride/4,4 '-diamino-diphenyl ether is with 1/1 mol ratio synthesizing polyamides acid.This polyamic acid is modulated into the DMF that its content is 18.5 weight % (dimethyl formamide) solution 100 grams, be mixed into the transforming agent that constitutes by 35 gram diacetyl oxides and 5 gram β-pyrrolines, after stirring, centrifugation deaeration, its curtain coating on aluminium foil is coated with 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.Heated 110 seconds with 140 ℃ of laminaties, obtain having gel-film from supporting to this aluminium foil and polyamic acid solution.The residual volatile component concentration of this gel-film is 46 weight %, and the imidization rate is 82%.This gel-film be impregnated in the isoquinoline 99.9, remove unnecessary drop by roll after, under 300 ℃, 400 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 1.

Embodiment 7

With pyromellitic acid dianhydride/4,4 '-diamino-diphenyl ether is with 1/1 mol ratio synthesizing polyamides acid.This polyamic acid is modulated into the DMF that its content is 18.5 weight % (dimethyl formamide) solution 100 grams, be mixed into the transforming agent that constitutes by 35 gram diacetyl oxides and 5 gram β-pyrrolines, after stirring, centrifugation deaeration, its curtain coating on aluminium foil is coated with 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.Heated 60 seconds with 170 ℃ of laminaties, obtain having gel-film from supporting to this aluminium foil and polyamic acid solution.The residual volatile component concentration of this gel-film is 42 weight %, and the imidization rate is 88%.This gel-film be impregnated in the isoquinoline 99.9, remove unnecessary drop by roll after, respectively heated 30 seconds during respectively at 300 ℃, 400 ℃, 500 ℃, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 1.

In the table, PMDA represents pyromellitic acid dianhydride, and 4,4 ' ODA represents 4,4 '-diamino-diphenyl ether, and p-PDA represents Ursol D.

Among the embodiment 1 to 7, although also shortened the manufacturing time of gel-film, the numerical value of the physical strength of gained polyimide film can be equal to mutually with the comparative example 1 of colloid Production Time length and the polyimide film of 3 gained.

By the present invention, can be made into the polyimide film that productivity is better, have higher mechanical characteristics.

In following examples and the comparative example, the tear propagation strength of polyimide film is estimated according to ASTM D-1938, tensile strength is estimated according to JIS C-2318, (mining company of Mitsui Metal Co., Ltd. makes bond strength with electrolytic copper foil by being tackiness agent with nylon epoxy, trade(brand)name 3ECVLP, thickness are 35 microns) bonding with polyimide film, make 3 layers of copper foil covered plywood, according to JIS C-6481, be to peel with 90 degree under 3 millimeters the condition to estimate at the pattern width of copper.

In addition, for the catalytic amount in the loss on heating component, with thermolysis vapor-phase chromatography (ヒユ one レ Star トパ Star カ one De corporate system HP 5890-II, decomposition condition: determined in 20 seconds for 445 ℃).

Comparative example 5

With pyromellitic acid dianhydride/4,4 '-diamino-diphenyl ether/Ursol D is with 4/3/1 mol ratio synthesizing polyamides acid.This polyamic acid is modulated into DMF solution 100 grams that its content is 18.5 weight %, is mixed into the transforming agent that constitutes by 35 gram diacetyl oxides and 5 gram β-pyrrolines, after stirring, centrifugation deaeration, its curtain coating on aluminium foil is coated with 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.Heated 150 seconds with 120 ℃ of laminaties, obtain having gel-film from supporting to this aluminium foil and polyamic acid solution.The residual volatile component concentration of this gel-film is 38 weight %.This gel-film is peeled from aluminium foil, fix on the top of the shelf.Under 300 ℃, 400 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 2.

Comparative example 6

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 5, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 39 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 2.

Embodiment 8

Identical with comparative example 5, the polyamic acid curtain coating is coated on the aluminium foil.The laminate of this aluminium foil and polyamic acid solution in 120 ℃ of heating 10 seconds, in 140 ℃ of heating 10 seconds, and in 160 ℃ of heating 55 seconds, is obtained having the gel-film from supporting.The residual volatile component concentration of this gel-film is 56 weight %.To this gel-film respectively at 300 ℃, 400 ℃, then be respectively to heat under 500 ℃ 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 2.

Comparative example 7

Except the molar ratio with 1/1 uses pyromellitic acid dianhydride/4, beyond 4 '-diamino-diphenyl ether, all the other are identical with comparative example 5, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 35 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 2.

Comparative example 8

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 7, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 37 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 2.

Embodiment 9

Identical with comparative example 2, the polyamic acid curtain coating is coated on the aluminium foil.The laminate of this aluminium foil and polyamic acid solution in 120 ℃ of heating 10 seconds, in 140 ℃ of heating 10 seconds, and in 160 ℃ of heating 55 seconds, is obtained having the gel-film from supporting.The residual volatile component concentration of this gel-film is 54 weight %.To this gel-film respectively at 300 ℃, 400 ℃, then be respectively to heat under 500 ℃ 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 2.

In addition, residual catalyst amount in the gel-film and main quantity of solvent are by gel-film being flooded 48 hours in the N-N-methyl-2-2-pyrrolidone N-, being determined by this liquid of gc analysis.But moisture contained in the residual volatile component is disregarded, and diacetyl oxide comes quantitatively with impregnated in the acetate that hydrolysis forms in the N-N-methyl-2-2-pyrrolidone N-.

Comparative example 9

With pyromellitic acid dianhydride/4,4 '-diamino-diphenyl ether/Ursol D is with 4/3/1 mol ratio synthesizing polyamides acid.This polyamic acid is modulated into DMF solution 100 grams that its content is 18.5 weight %, sneaks into the transforming agent that constitutes by 38 gram diacetyl oxides, 4.5 gram isoquinoline 99.9 and 15 gram DMF therein, after stirring, centrifugation deaeration, its curtain coating is coated on the aluminium foil.All when being cooled to 0 ℃, carry out from being stirred to deaeration.Heated 150 seconds with 120 ℃ of laminaties, obtain having gel-film from supporting to this aluminium foil and polyamic acid solution.The residual volatile component concentration of this gel-film is 40 weight %, and the DMF in the residual volatile component is 39 weight %, and isoquinoline 99.9 is 51 weight %, and acetate is 10 weight %.This gel-film is peeled from aluminium foil, fix on the top of the shelf.Under 300 ℃, 400 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The basic mechanical characteristics of this polyimide film is as shown in table 3.

Comparative example 10

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 9, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 39 weight %, and the DMF in the residual volatile component is 38 weight %, and isoquinoline 99.9 is 45 weight %, and acetate is 17 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 3.

Embodiment 10

Restrain the additive that DMF constitute except use restrains isoquinoline 99.9 and 30 by 20 gram diacetyl oxides, 10, beyond heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 9, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 44 weight %, and the DMF in the residual volatile component is 17 weight %, and isoquinoline 99.9 is 75 weight %, and acetate is 8 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 3.

Comparative example 11

Except the molar ratio with 1/1 uses pyromellitic acid dianhydride/4, beyond the acid of 4 '-diamino-diphenyl ether synthesizing polyamides, all the other are identical with comparative example 9, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 35 weight %.DMF in the residual volatile component is 37 weight %, and isoquinoline 99.9 is 56 weight %, and acetate is 7 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 3.

Comparative example 12

Except heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 9, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 38 weight %, and the DMF in the residual volatile component is 36 weight %, and isoquinoline 99.9 is 43 weight %, and acetate is 21 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 3.

Embodiment 11

Restrain the additive that DMF constitute except use restrains isoquinoline 99.9 and 30 by 20 gram diacetyl oxides, 10, beyond heating 75 seconds with 160 ℃ of laminaties to aluminium foil and polyamic acid solution, all the other are identical with comparative example 3, make the polyimide film of 25 micron thickness.Residual volatile component concentration at the gel-film of intermediate stage process is 50 weight %, and the DMF in the residual volatile component is 18 weight %, and isoquinoline 99.9 is 72 weight %, and acetate is 10 weight %.The basic mechanical characteristics of this polyimide film is as shown in table 3.

In following examples and the comparative example, " part " expression weight part among the embodiment, " % " expression weight %.

(evaluation method)

1) mensuration of tension stress

Measure according to ASTM D 882.

2) mensuration of the R value of MD direction

The central part of the polyimide film of gained along 5 meters of MD direction samplings, is carried out thickness measurement continuously with the continuous thickness gauge of contact, read the highest thickness and minimum thickness by chart.

R value=[the highest thickness]-[minimum thickness]

By the above-mentioned R value of obtaining.Unit is a micron.

Comparative example 13

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 573 gram diacetyl oxides, 73 gram isoquinoline 99.9 and 154 gram DMF, be to stir apace with mixing machine under 40% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 12 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 750 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 3.0 times, is 0.3 times as the isoquinoline 99.9 of catalyzer.This resin molding with 130 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.When this film of check, see that the two ends of film are involved in the bubble of numerous diameter 5 millimeter.

Comparative example 14

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 764 gram diacetyl oxides, 97 gram isoquinoline 99.9 and 336 gram DMF, be to stir apace with mixing machine under 60% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 16 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 460 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 4.0 times, is 0.4 times as the isoquinoline 99.9 of catalyzer.This resin molding with 140 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.When this film of check, can see that the two ends of film are involved in the bubble of numerous diameter 5 millimeter.

Comparative example 15

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether with 1/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 632 gram diacetyl oxides, 80 gram isoquinoline 99.9 and 88 gram DMF, be to stir apace with mixing machine under 40% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 12 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 790 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 3.5 times, is 0.35 times as the isoquinoline 99.9 of catalyzer.This resin molding with 130 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.When this film of check, can see that the two ends of film are involved in the bubble of numerous diameter 5 millimeter.

Comparative example 16

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether with 1/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 813 gram diacetyl oxides, 103 gram isoquinoline 99.9 and 285 gram DMF, be to stir apace with mixing machine under 60% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 16 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 480 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 4.5 times, is 0.45 times as the isoquinoline 99.9 of catalyzer.This resin molding with 140 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.When this film of check, can see that the two ends of film are involved in the bubble of numerous diameter 5 millimeter.

Embodiment 12

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 382 gram diacetyl oxides, 97 gram isoquinoline 99.9 and 318 gram DMF, be to stir apace with mixing machine under 40% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 12 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 520 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.4 times as the isoquinoline 99.9 of catalyzer.This resin molding with 130 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.

Embodiment 13

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 382 gram diacetyl oxides, 169 gram isoquinoline 99.9 and 249 gram DMF, be to stir apace with mixing machine under 60% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 16 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 320 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.7 times as the isoquinoline 99.9 of catalyzer.This resin molding with 140 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.

Embodiment 14

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether with 1/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 361 gram diacetyl oxides, 103 gram isoquinoline 99.9 and 336 gram DMF, be to stir apace with mixing machine under 40% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 12 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 580 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.45 times as the isoquinoline 99.9 of catalyzer.This resin molding with 130 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.

Embodiment 15

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether with 1/1 mol ratio synthetic polyamic acid, sneak into the solidifying agent that constitutes by 271 gram diacetyl oxides, 228 gram isoquinoline 99.9 and 301 gram DMF, be to stir apace with mixing machine under 60% the state with described solidifying agent with respect to the weight ratio of polyamic acid DMF solution, after extruding from T pattern head, advance 25 millimeters with 16 meters/minute speed under die head, curtain coating is on stainless steel ring-type conduction band.This moment, the viscosity of resin solution in T pattern head was 360 pools in the time of 0 ℃.And as the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 1.5 times, is 1.0 times as the isoquinoline 99.9 of catalyzer.This resin molding with 140 ℃ * 100 seconds, 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization, is obtained 25 micron thickness polyimide films.The characteristic of this polyimide film is shown in table 4.

Table 4

According to the present invention, form by regulating solidifying agent, can reduce the soltion viscosity in the extrusion die, thereby prevent from when making film at a high speed, to be involved in bubble, can be made into and can prevent to produce the polyimide film that thickness deviation has superior mechanical properties again along the MD direction.

In following examples and the comparative example, various mensuration are performed as follows.

(evaluation method)

1) mensuration of tension stress

Measure according to ASTM D 882.

2) mensuration of tear propagation strength

Measure according to ASTM D 1938.

3) mensuration of the maximum value of tear propagation strength and the ratio of minimum value.

Along the width of film interval sampling and measuring with 10 centimetres, measure its tear propagation strength, calculate their ratio by (minimum value)/(maximum value).

4) tear propagation strength R value

By read sample measure in the difference of maximum value and minimum value estimate.(with reference to Fig. 1)

And the end of so-called film is meant with fixed positions such as pin or clips to the inboard 10 microns places of film.

5) bond strength

(mining company of Mitsui Metal Co., Ltd. makes with electrolytic copper foil by being tackiness agent with nylon epoxy, trade(brand)name 3ECVLP, thickness are 35 microns) bonding with polyimide film, make 3 layers of copper foil covered plywood, according to JISC-6481, be to peel with 90 degree under 3 millimeters the condition to estimate at the pattern width of copper.

In addition, the heating of film with all embodiment condition identical with comparative example under carry out.

Embodiment 16

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into by 38 parts of diacetyl oxides, 10 parts of isoquinoline 99.9 and 52 parts of solidifying agent that DMF constitutes, is that 50 parts ratio stirs apace with mixing machine with described solidifying agent with respect to 100 parts of polyamic acid DMF solution, after extruding from T pattern head, advance under die head 20 millimeters, curtain coating is on stainless steel ring-type conduction band.As the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.4 times as the isoquinoline 99.9 of catalyzer.To this resin molding with 130 ℃ * 100 seconds the heating after, this film is peeled from supporting mass, fix its end with pin,, obtain the polyimide film of 25 micron thickness, 1500 mm wides then with 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization.The characteristic of this polyimide film is shown in table 5.

Embodiment 17

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into by 38 parts of diacetyl oxides, 19 parts of isoquinoline 99.9 and 43 parts of solidifying agent that DMF constitutes, is that 50 parts ratio stirs apace with mixing machine with described solidifying agent with respect to 100 parts of polyamic acid DMF solution, after extruding from T pattern head, advance under die head 20 millimeters, curtain coating is on stainless steel ring-type conduction band.As the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.8 times as the isoquinoline 99.9 of catalyzer.To this resin molding with 130 ℃ * 100 seconds the heating after, this film is peeled from supporting mass, fix its end with pin,, obtain the polyimide film of 25 micron thickness, 1500 mm wides then with 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization.The characteristic of this polyimide film is shown in table 5.

Embodiment 18

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of the mol ratio synthetic polyamic acid of 4 '-diamino-diphenyl ether 1/1, sneak into by 28 parts of diacetyl oxides, 14 parts of isoquinoline 99.9 and 58 parts of solidifying agent that DMF constitutes, is that 65 parts ratio stirs apace with mixing machine with described solidifying agent with respect to 100 parts of polyamic acid DMF solution, after extruding from T pattern head, advance under die head 20 millimeters, curtain coating is on stainless steel ring-type conduction band.As the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.8 times as the isoquinoline 99.9 of catalyzer.To this resin molding with after 130 ℃ * 100 seconds dryings, this film is peeled from supporting mass, fix its end with pin,, obtain the polyimide film of 25 micron thickness, 1500 mm wides then with 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization.The characteristic of this polyimide film is shown in table 5.

Comparative example 17

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, sneak into by 67 parts of diacetyl oxides, 8 parts of isoquinoline 99.9 and 25 parts of solidifying agent that DMF constitutes, is that 50 parts ratio stirs apace with mixing machine with described solidifying agent with respect to 100 parts of polyamic acid DMF solution, after extruding from T pattern head, advance under die head 20 millimeters, curtain coating is on stainless steel ring-type conduction band.As the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 3.5 times, is 0.35 times as the isoquinoline 99.9 of catalyzer.To this resin molding with 130 ℃ * 100 seconds the heating after, this film is peeled from supporting mass, fix its end with pin,, obtain the polyimide film of 25 micron thickness, 1500 mm wides then with 300 ℃ * 20 seconds, 450 ℃ * 20 seconds, 500 ℃ * 20 seconds dryings, imidization.The characteristic of this polyimide film is shown in table 5.

Comparative example 18

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of the mol ratio synthetic polyamic acid of 4 '-diamino-diphenyl ether 1/1, sneak into by 36 parts of diacetyl oxides, 5 parts of isoquinoline 99.9 and 59 parts of solidifying agent that DMF constitutes, is that 50 parts ratio stirs apace with mixing machine with described solidifying agent with respect to 100 parts of polyamic acid DMF solution, after extruding from T pattern head, advance under die head 20 millimeters, curtain coating is on stainless steel ring-type conduction band.As the diacetyl oxide of dewatering agent with respect to the mol ratio of the amido acid of 1 mole of polyamic acid resin liquid be this moment: the diacetyl oxide as dewatering agent is 2.0 times, is 0.2 times as the isoquinoline 99.9 of catalyzer.To this resin molding with heating in 130 ℃ * 100 seconds after, this film when supporting mass peels, can not be peeled off supporting mass with it.

According to the present invention, form the deviation of physical strength and bond strength on the width in the time of to reduce to make film continuously by regulating solidifying agent.

Embodiment 19

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, the transforming agent that adding is made of diacetyl oxide, isoquinoline 99.9 and DMF is that the ratio of 50 weight % is mixed, stirred with described transforming agent with respect to polyamic acid DMF solution.At this moment, be mixed with the acid amides acidic group with respect to polyamic acid, diacetyl oxide and isoquinoline 99.9 are respectively 2.0 and 0.4 molar equivalent.With this mixture by T groove part mould curtain coating on the stainless steel ring-type conduction band of rotation, heat the good resin molding of curtain coating with 150 ℃ hot blasts, obtain the residual volatile component and be 55 weight %, thick about 0.20 millimeter gel-film that has from supporting.This gel-film is peeled from the ring-type conduction band, its two ends are fixed on the expanding frame, be transported in 220 ℃, 370 speed, 550 ℃ process furnace, the operation of shearing through the end obtains 1500 microns wide, the polyimide film of 25 micron thickness.Estimate degree of molecular orientation MOC-c, Young's modulus, tension stress and the linear expansivity of this polyimide film in the following manner, it the results are shown in table 6.

(degree of molecular orientation MOR-c)

From the central part of the film of gained 1500 mm wides, leave 375 millimeters in central authorities and promptly leave 750 millimeters places of central authorities along the end, respectively cut out 40 millimeters * 40 millimeters square.Degree of molecular orientation MOR-c measures with the microwave molecular orientation meter MOA 2012A type that KS システ system ズ company makes.By the MOR value that this tester records, be the numerical value of molecular orientation anisotropy degree in the expression face, because it and thickness are proportional, so the MOR value is converted into 75 micron thickness by following formula.And it is isotropic that MOR-c approaches 1.0 expression films.

MOR-c＝1+(MOR-1)×t/75

In the formula, MOR and t are defined as follows.That is,

MOR: be converted into the preceding degree of molecular orientation of thickness

T: the thickness of determinand (micron).

This determinator is to insert in the microwave resonance waveguide by will measure sample under the perpendicular state of face and microwave direct of travel, makes the sample rotation, measures microwave penetration intensity.Fig. 2 has shown the transmitted intensity curve of gained briefly, and the orientation of its transmitted intensity minimum is the orientation main shaft, for being orientated the parallel or vertical direction of main shaft with this, according to following mensuration Young's modulus and linear expansivity.In addition, 1 is the orientation main shaft of molecular orientation, and 2 is the microwave penetration intensity curve, and 3 is orientation angle.

(Young's modulus)

At the central part of the film of gained 1500 mm wides, leave that 375 millimeters of central parts are located and the end is promptly left 750 millimeters places of central part and got 5 samples, estimate its Young's modulus and tension stress according to JIS C-2318.And, with above-mentioned molecular orientation instrumentation must with orientation main shaft parallel and vertical direction on cut out sample, it is measured.

(linear expansivity)

At the central part of the film of gained 1500 mm wides, leave that 375 millimeters of central parts are located and the end is promptly left 750 millimeters places of central part and got 5 samples, by the hot physical test machine TMA-8140 that uses electric corporation of science to make, at first under 10 ℃/minute condition, be heated to 400 ℃, then cool to room temperature from room temperature.Heat up once more under the same conditions, obtain the linear expansivity in 100～200 ℃ of temperature ranges.

Comparative example 19

Except being mixed with the acid amides acidic group with respect to polyamic acid, diacetyl oxide and isoquinoline 99.9 are respectively beyond 5.5 and 2.0 molar equivalents, and all the other are with the method identical with embodiment 19, and obtaining the residual volatile component is the gel-film of about 0.20 mm thick of 45 weight %.This gel-film is peeled from the ring-type conduction band, its two ends are fixed on the expanding frame, be transported in 200 ℃, 350 ℃, 550 ℃ the process furnace.Through end cutting operation, obtain the polyimide film of 1500 mm wides, 25 micron thickness.Degree of molecular orientation MOR-c, Young's modulus, tension stress and the linear expansivity of this polyimide film are shown in table 6.

Comparative example 20

Heating in being transported to the process furnace that is made as 300 ℃, 450 ℃, 550 ℃, all the other obtain the polyimide film of 1500 mm wides, 25 micron thickness with the method identical with embodiment 19.Degree of molecular orientation MOR-c, Young's modulus, tension stress and the linear expansivity of this polyimide film are shown in table 6.

Embodiment 20

In pyromellitic acid dianhydride/4, in the 18.5 weight %DMF solution of 4 '-diamino-diphenyl ether/Ursol D with 4/3/1 mol ratio synthetic polyamic acid, the transforming agent that adding is made of diacetyl oxide, isoquinoline 99.9 and DMF is that the ratio of 50 weight % is mixed, stirred with described transforming agent with respect to polyamic acid DMF solution.Be mixed with the amido acid unit with respect to polyamic acid this moment, and diacetyl oxide and isoquinoline 99.9 are respectively 2.0 and 0.4 molar equivalent.With this mixture by T groove part mould curtain coating on the stainless steel ring-type conduction band of rotation, heat the good resin molding of curtain coating with 150 ℃ hot blasts, obtain the residual volatile component and be 50 weight %, thick about 0.10 millimeter gel-film that has from supporting.This gel-film is peeled from the ring-type conduction band, its two ends are fixed on the expanding frame, be transported in 200 ℃, 350 speed, 550 ℃ process furnace and heat, the operation of shearing through the end obtains 1500 microns wide, the polyimide film of 12.5 micron thickness.Degree of molecular orientation MOC-c, Young's modulus, tension stress and the linear expansivity of this polyimide film are shown in table 7.

Comparative example 21

Except being mixed with the acid amides acidic group with respect to polyamic acid, diacetyl oxide and isoquinoline 99.9 are respectively beyond 5.5 and 2.0 molar equivalents, and all the other are with the method identical with embodiment 19, and obtaining the residual volatile component is the gel-film of 0.10 mm thick of 45 weight %.This gel-film is peeled from the ring-type conduction band, its two ends are fixed on the expanding frame, be transported in 200 ℃, 350 ℃, 550 ℃ the process furnace.Through end cutting operation, obtain the polyimide film of 1500 mm wides, 25 micron thickness.Degree of molecular orientation MOR-c, Young's modulus, tension stress and the linear expansivity of this polyimide film are shown in table 7.

Comparative example 22

Heating in being transported to the process furnace that is made as 300 ℃, 450 ℃, 550 ℃, all the other obtain the polyimide film of 1500 mm wides, 12.5 micron thickness with the method identical with embodiment 19.Degree of molecular orientation MOR-c, Young's modulus, tension stress and the linear expansivity of this polyimide film are shown in table 7.

By table 6 and table 7 as can be known, if the degree of molecular orientation MOR-c value at any position is all below 1.30 or even below 1.20 on the film width, then be orientated main shaft and with orientation main shaft vertical direction on the deviation of characteristic minimum, promptly can be considered and have isotropy.

By the present invention, providing particularly, the interior isotropy of face of end is improved, the minimum isotropic membrane of mechanical property characteristic difference of any part.It is applicable to that flexible circuit board or TAB require in the purposes of precise measure stability with covering layer film etc. with carrier band or flexible printed circuit.

Among the following embodiment and comparative example, the Young's modulus of polyimide film and tension stress are estimated according to JIS C-2318.

The mensuration of linear expansivity, the hot physical test machine TMA-8140 that is to use electric corporation of science to make at first is heated to 400 ℃ from room temperature, then cool to room temperature under 10 ℃/minute condition.Heat up once more under the same conditions, obtain the linear expansivity in 100～200 ℃ of temperature ranges.

And the degree of birefringence described in the present invention is specific refractory power poor on the specific refractory power on any direction and the thickness direction in the face, is calculated by following formula.

Degree of birefringence Δ n=(the specific refractory power Nx in the face on the direction)-(the specific refractory power Nz on the thickness direction)

With the concrete measuring method of simple example explanation, as shown in Figure 3, with film sample 21 wedgings 22, to the bottom surface of wedge shape, promptly with face parallel radiation sodium light 24, see interference ripple 25 during with polarized light microscope observing.With this interference ripple number is n, and degree of birefringence Δ n is expressed from the next:

Δn＝n×λ/d

Wherein, λ is wavelength 589 nanometers of sodium D-line, and d is the width (nanometer) of sample.Specifically on the books in " new experimental chemistry lecture " the 19th volume documents such as (ball are apt to (strain)).

Comparative example 23

Restrain by pyromellitic acid dianhydride/4 100,4 '-diamino-diphenyl ether/Ursol D is with 18.5 weight %N of 4/3/1 mol ratio synthetic polyamic acid, in the dinethylformamide solution, add 35 gram diacetyl oxides and 5 gram isoquinoline 99.9, after mixing, stirring, centrifugation deaeration, its curtain coating is coated on the aluminium foil, forms the resin molding of 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.With 100 ℃ this resin molding was heated 120 seconds, then it is peeled from aluminium foil, obtain having gel-film from supporting.The residual volatile component concentration of this gel-film is 160 weight %, and the imidization rate is 81%.Afterwards, the end with this gel-film is fixed on the pin frame (pin flame).Under 150 ℃, 250 ℃, 450 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Comparative example 24

Restrain by pyromellitic acid dianhydride/4 100,4 '-diamino-diphenyl ether/Ursol D is with 18.5 weight %N of 4/3/1 mol ratio synthetic polyamic acid, in the dinethylformamide solution, add 40 gram diacetyl oxides and 8 gram isoquinoline 99.9, after mixing, stirring, centrifugation deaeration, its curtain coating is coated on the aluminium foil, forms the resin molding of 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.With 140 ℃ this resin molding was heated 150 seconds, then it is peeled from aluminium foil, obtain having gel-film from supporting.At this moment the residual volatile component concentration of this gel-film is 35 weight %, and the imidization rate is 92%.Afterwards, the end with this gel-film is fixed on the pin frame.Under 350 ℃, 400 ℃, 450 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Embodiment 21

Use and residual volatile component concentration that comparative example 23 identical methods obtain is 160%, the imidization rate is 81% gel-film, its end is fixed on the pin frame, under 350 ℃, 400 ℃, 450 ℃, 500 ℃, respectively heated 30 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Comparative example 25

Restrain by right-phenylene two (trimellitic acid monoesters acid anhydrides)/pyromellitic acid dianhydride/4 100,4 '-diamino-diphenyl ether/Ursol D is with 18.5 weight %N of 3/1/3/1 mol ratio synthetic polyamic acid, in the dinethylformamide solution, adding is by 35 gram diacetyl oxides and 3.5 gram β-pyrrolines, after mixing, stirring, centrifugation deaeration, its curtain coating is coated on the aluminium foil, forms the resin molding of 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.With 90 ℃ this resin molding was heated 120 seconds, it is peeled from aluminium foil, obtain having gel-film from supporting.This moment, the residual volatile component concentration of this gel-film was 140 weight %, and the imidization rate is 80%.Afterwards, the end with this gel-film is fixed on the pin frame.Under 180 ℃, 370 ℃, 520 ℃, respectively heated 45 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Comparative example 26

Restrain by right-phenylene two (trimellitic acid monoesters acid anhydrides)/pyromellitic acid dianhydride/4 100,4 '-diamino-diphenyl ether/Ursol D is with 18.5 weight %N of 3/1/3/1 mol ratio synthetic polyamic acid, in the dinethylformamide solution, adding is by 35 gram diacetyl oxides and 4.2 gram β-pyrrolines, after mixing, stirring, centrifugation deaeration, its curtain coating is coated on the aluminium foil, forms the resin molding of 400 micron thickness.All when being cooled to 0 ℃, carry out from being stirred to deaeration.With 90 ℃ this resin molding was heated 120 seconds, it is peeled from aluminium foil, obtain having gel-film from supporting.This moment, the residual volatile component concentration of this gel-film was 33 weight %, and the imidization rate is 95%.Afterwards, the end with this gel-film is fixed on the pin frame.Under 350 ℃, 450 ℃, 520 ℃, respectively heated 45 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Embodiment 22

Use and residual volatile component concentration that comparative example 25 identical methods obtain is 140%, the imidization rate is 80% gel-film, its end is fixed on the pin frame, under 350 ℃, 400 ℃, 450 ℃, 520 ℃, respectively heated 45 seconds, make the polyimide film of 25 micron thickness.The rerum natura of this polyimide film is as shown in table 8.

Table 8

	Comparative example 23	Comparative example 24	Embodiment 21	Comparative example 25	Comparative example 26	Embodiment 22
							Residual volatile component concentration (%)	160	35	160	140	33	140
The heating initial temperature (℃)	150	350	350	180	350	350
							Degree of birefringence	0.12	0.13	0.15	0.13	0.13	0.16
Young's modulus (GPa)	4.0	4.1	4.5	4.6	4.9	5.4
							Tension stress (MPa)	270	277	328	300	304	319
Linear expansivity (ppm)	16.8	15.9	14.0	15.0	14.5	13.3

According to the present invention, the upright and outspoken monomer of can not increase the set of monomers mark, not introducing high price is not introduced miscellaneous stretcher etc. yet, is stably provided the polyimide film with high elastic coefficient and low linear expansion coefficient with the unexistent method economy of prior art.According to the present invention, require in the purposes of precise measure precision with covering layer film etc. with carrier band or flexible printed circuit applicable to flexible printed circuit or TAB.

The manufacture method of polyimide film involved in the present invention comprises following operation: with polyamic acid organic solvent solution curtain coating or be coated on after drying on the supporting mass, make operation partly solidified and/or part exsiccant polyamide acid film; Described polyamide acid film be impregnated in tertiary amine or ertiary amine solution or the operation of coating tertiary amine or ertiary amine solution on this polyamide acid film; Making polyamic acid afterwards is polyimide through imidization, and the operation of dry this film.

The manufacture method of polyimide film involved in the present invention also comprises the operation of removing the remaining unnecessary drop in striping surface.

And in the manufacture method of polyimide film involved in the present invention, the residual volatile component concentration of partly solidified and/or part exsiccant polyamide acid film is below 5～100 weight %, and the imidization rate is more than 50%.

In addition, in the manufacture method of polyimide film involved in the present invention, described tertiary amine is selected from quinoline, isoquinoline 99.9, β-pyrroline, pyridine.

Polyimide film involved in the present invention can be made by above-mentioned either party's method.

Again, the manufacture method of polyimide film involved in the present invention is for achieving the above object, also can comprise following operation: after in the organic solvent solution of polyamic acid, sneaking into chemical converting agent and catalyzer, with the polyamic acid composition curtain coating of gained on supporting mass, on supporting mass, heat with at least 2 temperature standards, then polyamide acid film is peeled from supporting mass, obtain partly solidified and/or part exsiccant polyamide acid film, make remaining amido acid imidization contained in the polyamide acid film afterwards, and dry this film.

Again, the manufacture method of polyimide film involved in the present invention also can comprise following operation: sneak into chemical converting agent and catalyzer in the organic solvent solution of polyamic acid after, with the polyamic acid composition curtain coating of gained on supporting mass, on supporting mass, heat with at least 2 temperature standards, then polyamide acid film is peeled from supporting mass, obtain partly solidified and/or part exsiccant polyamide acid film, make remaining amido acid imidization contained in the polyamide acid film afterwards, and drying obtains this film, the loss on heating rate is 0.2～2.5 weight %, and catalyzer accounts for more than the 0.01 weight % of film gross weight in this loss on heating.

Again, the manufacture method of polyimide film involved in the present invention, for achieving the above object, also can comprise following operation: after the organic solvent solution of polyamic acid is sneaked into chemical converting agent and catalyzer, with its curtain coating on supporting mass, after heating, under the residual state that volatile constituent arranged, film is peeled from supporting mass, catalyzer is more than 50 weight parts when obtaining residual volatile constituent and being 100 weight parts, solvent is below 30 weight parts, and chemical converting agent and/or from the partly solidified and/or part exsiccant polyamide acid film of component below 20 weight parts of chemical converting agent, make remaining polyamic acid continue imidization, and dry this film.

Again, in the manufacture method of polyimide film involved in the present invention, residual volatile component concentration in the partly solidified and/or part exsiccant polyamide acid film, with this acid amides sorrel in 450 ℃ down heating after 20 minutes weight be benchmark, below 100 weight %.

In the manufacture method of polyimide film involved in the present invention, available tertiary amine is as catalyzer.

Polyimide film involved in the present invention can be the polyimide film made from aforesaid method.

Polyimide film involved in the present invention, the loss on heating rate of being determined by following formula is 0.2～2.5 weight %, and in this loss on heating, catalyzer accounts for more than the 0.01 weight % of film gross weight.

(loss on heating rate)=(X-Y)/Y

X: in the film quality of 150 ℃ of heating after 10 minutes

Y: in the film quality of 450 ℃ of heating after 20 minutes

Again, in the manufacture method involved in the present invention, also comprise for achieving the above object: make in the method for polyimide film at the composition curtain coating system film that will contain polyamic acid, in the organic solvent solution of polyamic acid, add solidifying agent, described solidifying agent contain with respect to amido acid be more than 1 molar equivalent dewatering agent and with respect to the imidization catalyst more than 0.2 molar equivalent of amido acid, and the mol ratio of described dewatering agent and described imidization catalyst is 1: 0.15～1: 0.75.

Again, the manufacture method of polyimide film involved in the present invention can add 30～70 parts solidifying agent in the organic solvent solution of 100 parts polyimide acid in the manufacture method of above-mentioned polyimide film.

Again, the manufacture method of polyimide film involved in the present invention can add the viscosity of the formed resin solution composition of solidifying agent in the time of 0 ℃ below 600 pools in the organic solvent solution of polyamic acid in the manufacture method of above-mentioned polyimide film.

Again, the manufacture method of polyimide film involved in the present invention can add the viscosity of the formed resin solution composition of solidifying agent in the time of 0 ℃ below 400 pools in the organic solvent solution of polyamic acid in the manufacture method of above-mentioned polyimide film.

Again, the manufacture method of polyimide film involved in the present invention, available tertiary amine is as imidization catalyst.

Again, the manufacture method of polyimide film involved in the present invention can be made polyimide film by aforesaid method.

Again, polyimide film involved in the present invention, for achieving the above object, described polyimide film width during fabrication is more than 1 meter, the maximum value of the tear propagation strength that it records along total width and the ratio of minimum value are more than 0.7, and tear propagation strength is surveyed periodic R value below 0.6g.

Again, the manufacture method of polyimide film involved in the present invention, can comprise: in the organic solvent solution of polyamic acid, add solidifying agent, it is dewatering agent and the imidization catalyst more than 0.3 molar equivalent more than 1.0～3.0 molar equivalents that described solidifying agent contains with respect to amido acid, with the resin solution casting film that forms thus.

Again, the present invention can be the novel polyimide film and the manufacture method thereof of following structure.

1) can with the degree of molecular orientation MOR-c of any part in the wide production of the film more than 1250 millimeters, the film all below 1.30, the polyimide film of modulus in tension below the above 5.0GPa of 2.5GPa (Ji Pa).

2) manufacture method of polyimide film, it comprises: the polyamic acid mixing solutions curtain coating that will be made of polyamic acid, dewatering agent, closed loop catalyzer and organic solvent is on supporting mass, through partly solidified and/or dryly have film (hereinafter referred to as gel-film) from supporting until formation, make it pass through process furnace after fixing at the two ends of this gel-film, thereby make polyimide film, in this method

(2) the heating starting temperature in the described process furnace is controlled at below supporting mass temperature+100 ℃ and in 150～250 ℃ scope.

3) as 2) manufacture method of described polyimide film, it is characterized in that the volatile constituent content of described gel-film is 15～150%.

In addition, the manufacture method of polyimide film involved in the present invention can comprise following operation: will be by polyamic acid, dewatering agent, the polyamic acid mixing solutions curtain coating that closed loop catalyzer and organic solvent constitute is on supporting mass, through the partly solidified and/or dry curtain coating operation that has film (hereinafter referred to as gel-film) until formation from supporting, and heat treated expanding heating process is being implemented in the manufacture method of interior polyimide film in fixing back, the end of above-mentioned gel-film, residual volatile component concentration by controlling described gel-film and the initial stage temperature in the expanding heating process are set control Young's modulus and linear expansivity.

In addition, the manufacture method of polyimide film involved in the present invention, it is characterized in that, comprising the polyamic acid mixing solutions curtain coating that will constitute by polyamic acid, dewatering agent, closed loop catalyzer and organic solvent on supporting mass, form through partly solidified and/be dried to the operation of the film (hereinafter referred to as gel-film) that has from supporting; And the back is fixed in the end of above-mentioned gel-film implement heat treated expanding heating process in the manufacture method of interior polyimide film, residual volatile component concentration by controlling described gel-film and the initial stage temperature in the expanding heating process are set, Young's modulus is brought up in the scope of 1.0GPa, and perhaps linear expansivity is reduced to 4ppm with interior scope.

The manufacture method of above-mentioned polyimide film comprises that also the residual volatile component concentration of gel-film is 50～300 weight %, and the initial temperature in the expanding heating process is made as 200～400 ℃.

The manufacture method of above-mentioned polyimide film comprises that also when the residual volatile component concentration of gel-film was 50～150 weight %, the initial temperature in the described expanding heating process was made as 250～400 ℃; Perhaps, when the residual volatile component concentration of gel-film was 150～300 weight %, the initial temperature in the described expanding heating process was made as 200～350 ℃.

The manufacture method of above-mentioned polyimide film also comprises, polyamic acid as polyimide precursor, mainly be to make, use in the described diamine component to account for the following Ursol D of the above 65 moles of % of 20 moles of % of whole diamine components with the polycondensation of aromatic tetracarboxylic acid's dianhydride and aromatic diamine as starting monomer.

Polyimide film involved in the present invention can be made by the manufacture method of above-mentioned polyimide film, and its degree of birefringence is more than 0.15.

And, for implementing embodiment or the embodiment in the best mode of the present invention, can understand technology contents of the present invention all the time, but this is not interpreted as the present invention with answering narrow sense and is only limited to these object lessons, the present invention can carry out various changes in the scope of its spiritual and following claim.

Industrial applicibility

It is good and have polyimide film and the manufacture method thereof of high mechanical properties to the present invention relates to productivity ratio, and it is applicable to the fields such as electric electronic Instrument element material of computer and IC control.

Claims

1. the manufacture method of polyimide film which comprises at least following operation: with the organic solvent solution curtain coating of polyamic acid or be coated on after drying on the supporting mass, make partly solidified and/or part exsiccant polyimide film is the operation of gel-film; Make the operation of described gel-film through imidization formation polyimide film,

It is characterized in that polyimide film is made by gel-film by manufacturing process with following (3),

The manufacturing process of the polyimide film that (3) may further comprise the steps: under the residual state that volatile constituent arranged, the polyamic acid composition on the described supporting mass is peeled from supporting mass, when obtaining the residual volatile component and being 100 weight parts imidization catalyst more than 50 weight parts, described catalyzer is below 30 weight parts and the gel-film of dewatering agent below 20 weight parts, make remaining polyamic acid continue imidization, and dry this film.

2. the manufacture method of polyimide film as claimed in claim 1 is characterized in that, the residual volatile component concentration of described gel-film is 5～500 weight %.

3. the manufacture method of polyimide film as claimed in claim 1 is characterized in that, the imidization rate of described gel-film is more than 50%.

4. polyimide film, it is made by the manufacture method of the described polyimide film of claim 1.

5. the manufacture method of polyimide film as claimed in claim 1, it is characterized in that, in described operation (3) by gel-film manufacturing polyimide film, the residual volatile component of described gel-film is benchmark with described polyamide acid film in the weight of heating after 20 minutes under 450 ℃, below 100 weight %.

6. as the manufacture method of claim 1 or 5 described polyimide films, it is characterized in that described imidization catalyst is a tertiary amine.

7. polyimide film, it is made by claim 5 or 6 described methods.