JP2009175375A - Antiglare laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antiglare film that shows improved transmissive sharpness without decreasing diffusion/antiglare property of the antiglare film, maintains high transmissive sharpness even when a haze is increased to reduce scintillation (surface glare), as well as has high weatherability and surface hardness and is improved in workability and safety during manufacturing the antiglare film. <P>SOLUTION: The antiglare film comprises a lactone ring-containing resin film used as a base film, and an antiglare layer provided on the base film. The antiglare layer is improved in transmissive sharpness without decreasing diffusion/antiglare property by controlling the difference in refractive indices between a binder and fine particles included in the binder to from 0.02 to 0.2. The layer maintains high transmissive sharpness even when a haze is increased to reduce scintillation (surface glare). The obtained antiglare film has high weatherability and high surface hardness and is improved in workability/safety when manufacturing/processing the film by using a lactone ring-containing resin film as the base film. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an antiglare laminate provided on the surface of a high-definition display device such as a CRT, PDP (plasma display), LCD (liquid crystal display) panel or the like.

In recent years, with the progress of high-definition image displays such as CRT, PDP (plasma display), LCD (liquid crystal display) panels, infrared sensors, optical waveguides, etc., optically transparent polymer materials, especially planar (film or sheet) There is an increasing demand for optically transparent polymer materials, that is, optical films.

In particular, optical films used in the display field have low optical elastic modulus, heat resistance, and high mechanical strength in addition to high transparency and high optical isotropy.
In the display as described above, an anti-glare film for diffusing the light emitted from the inside to some extent is mainly dazzling when viewing the display surface when the light emitted from the inside goes straight without diffusing on the display surface. It is provided on the display surface.
As disclosed in Patent Document 1 and Patent Document 2, this antiglare film is formed by coating a resin containing a filler such as silicon dioxide (silica) on the surface of a transparent substrate film.
These antiglare films are a type in which an irregular shape is formed on the surface of the antiglare layer by agglomeration of particles such as cohesive silica, and an organic filler having a particle size larger than the film thickness of the coating film is added to the resin. There is a type in which a concavo-convex shape is formed on the surface, or a type in which a concavo-convex shape is transferred by laminating a film having a concavo-convex shape on the layer surface.
In addition, when used outdoors, high weather resistance is required.
Further, when used on the display surface, high surface hardness is required.

In Patent Document 3, the transmission sharpness is improved even if the transmission sharpness is improved without increasing the diffusion / antiglare property of the antiglare film, and the haze value is increased to reduce the scintillation (glare of the surface). In order to maintain high, studies have been made on the blending ratio of the binder and fine particles in the antiglare layer and the particle size of the fine particles.
In patent document 4, the lactone ring containing resin is used for a base film, and the weather resistance and surface hardness of an anti-glare film are improved. However, the antiglare property was insufficient.
Furthermore, in consideration of the workability and safety of film handling, the surface potential of the film itself may be kept small and difficult to be charged in order to make it difficult to generate static electricity during the production and processing of the antiglare film. Required.
However, none of the conventional antiglare films satisfy the above-mentioned characteristics sufficiently.

JP-A-6-18706 JP 10-20103 A JP 11-326608 A JP2007-293272

The conventional anti-glare film as described above can obtain a light diffusing and anti-glare action only by the action of the surface shape of the anti-glare layer in any type. Although it is necessary to increase the uneven shape, there is a problem that when the unevenness increases, the haze (haze value) of the coating film increases, and the transmitted sharpness decreases accordingly.
Similar to the above, there is a light diffusion film in which fine particles are dispersed inside the layer to obtain a light diffusion effect, but in order to obtain a sufficient light diffusion effect with the fine particles used here, The particle size has to be increased. For this reason, although the haze value is high, there is a problem that the transmission sharpness is very small.
Furthermore, the conventional type of antiglare film has a problem that scintillation (glare of the surface) occurs on the film surface and the visibility of the display surface is lowered.
Furthermore, when an existing film is used as a base material, there are problems that weather resistance, surface hardness, workability and safety during film production / processing are insufficient.
The present invention has been made in view of the above-described conventional problems, and can improve transmission clarity and decrease scintillation without reducing diffusion / antiglare properties, and further, An object of the present invention is to provide an antiglare film having high weather resistance, surface hardness, improved workability and safety during film production and processing, a polarizing plate using the antiglare film, and a transmissive display device And

  According to the present invention, as in claim 1, at least a transparent base film and an antiglare layer containing at least one kind of fine particles in a binder are laminated, and the transparent base film has the following general formula ( A lactone ring-containing resin film having a lactone ring structure represented by 1), wherein the fine particles have a particle size of 0.5 to 5 μm and a difference in refractive index from the binder of 0.02 to 0.00. The above object is achieved by an antiglare film, which is 2 and is blended in an amount of 3 or more and less than 30 parts by weight with respect to 100 parts by weight of the binder.

[Wherein, R ¹ , R ² and R ³ independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms; the organic residue may contain an oxygen atom]
The antiglare layer may have a haze of 10% or more and less than 40%, a transmission definition of 50 or more, and a luminance variation observed from the front of the transmitted light may be less than 0.3V.

  Further, the antiglare layer may contain 5 parts by weight or less of cohesive silica fine particles.

  Furthermore, the binder may be an ionizing radiation curable resin.

  Furthermore, the invention of the transmissive display device is as described in claim 5 and includes a planar light-transmissive display body, a light source device that irradiates the light-transmissive display body from the back, and the surface of the light-transmissive display body. The above-mentioned object is achieved by constituting a transmissive display body having the above-described antiglare film laminated on the substrate.

  In the present invention, the difference in refractive index between the binder constituting the antiglare layer and the fine particles contained therein is set to 0.02 to 0.2, so that the transmission and clearness are not reduced without reducing the diffusion and antiglare properties. The degree is improved. In this case, even if the haze value is increased to reduce scintillation (glare of the surface), the transmission clearness can be kept high.

  Hereinafter, the present invention will be described in detail. However, the scope of the present invention is not limited to these descriptions, and modifications other than the following examples can be made as appropriate without departing from the spirit of the present invention.

  The antiglare film according to the embodiment of the present invention is an antiglare film obtained by laminating a lactone ring-containing resin film as a transparent base film and an antiglare layer containing fine particles in a binder. The particle size is 0.5 to 5 μm, the difference in refractive index from the binder is 0.02 to 0.2, and the binder is blended in an amount of 3 or more and less than 30 parts by weight with respect to 100 parts by weight. Has been.

  The binder can be cured after being applied to the transparent substrate film, for example, made of an ultraviolet curable resin (refractive index 1.53), and the fine particles are made of a binder, for example, styrene beads (refractive index 1.60). ing.

  The difference in refractive index between the fine particles and the binder is set to 0.02 or more. When the difference in refractive index is less than 0.02, the difference in refractive index between the two is too small to obtain a light diffusion effect. If the refractive index difference is larger than 0.2, the light diffusibility is too high and the entire film is whitened. The refractive index difference is most preferably 0.04 or more and 0.1 or less.

  The reason why the particle size of the fine particles is 0.5 μm or more is that when the particle size is less than 0.5 μm, the light diffusion effect cannot be obtained unless the addition amount of the fine particles to be added to the binder is very large. This is because unevenness on the surface is not formed, and the antiglare effect cannot be obtained. The reason why the particle size of the fine particles is 5 μm or less is that when the particle size exceeds 5 μm, the surface shape of the antiglare layer becomes rough and the haze value becomes high. Ideally, the diameter of the fine particles is 1 μm or more and 4 μm or less.

  Furthermore, when the addition amount of the fine particles to the binder is less than 30 parts by weight, the light diffusion effect cannot be obtained, and when it is 5 parts by weight or more, the entire film is whitened. The amount of fine particles added is ideally 5 parts by weight or more and 20 parts by weight or less when the binder is 100 parts by weight.

  As described above, a slight difference in refractive index between the fine particles as the filler and the binder allows the entire film to be whitened and transmitted through the antiglare film due to the diffusion effect while maintaining high transmission sharpness. Light to be averaged.

  For this reason, even when the haze value of the film is high, glare on the surface can be prevented without lowering the transmission sharpness, and even when the haze value is low (haze value of 20 or less), higher transmission is possible. The glare of the surface can be prevented while maintaining the sharpness.

In addition, the glare of the said surface is the brightness of light based on the brightness variation of the film surface. Therefore, the glare of the surface can be measured by measuring the variation in luminance on the film surface.
≪Base film≫
As the transparent base film, the thickness of the lactone ring-containing resin film is usually about 25 μm to 1000 μm. Furthermore, since the lactone ring-containing resin film has no birefringence, it is suitable as an antiglare film for liquid crystal displays.

  The lactone ring-containing resin film contains a lactone ring-containing polymer as a main component.

  The lactone ring-containing polymer preferably has a lactone ring structure represented by the following formula (1).

(In the formula, R ¹ , R ² and R ³ each independently represents a hydrogen atom or an organic residue having 1 to 20 carbon atoms. The organic residue may contain an oxygen atom.)
The content ratio of the lactone ring structure represented by the general formula (1) in the lactone ring-containing polymer structure is preferably 5 to 90% by mass, more preferably 10 to 70% by mass, and still more preferably 10 to 60% by mass. Especially preferably, it is 10-50 mass%. When the content of the lactone ring structure represented by the general formula (1) in the lactone ring-containing polymer structure is less than 5% by mass, the heat resistance, solvent resistance and surface hardness of the obtained polymer are lowered. Sometimes. On the other hand, when the content of the lactone ring structure exceeds 90% by mass, the moldability of the obtained polymer may be deteriorated.

  The lactone ring-containing polymer may have a structure other than the lactone ring structure represented by the general formula (1). The structure other than the lactone ring structure represented by the general formula (1) is not particularly limited. For example, a (meth) acrylic acid ester described later as a method for producing a lactone ring-containing polymer, Polymer structure formed by polymerizing at least one monomer selected from the group consisting of a hydroxyl group-containing monomer, an unsaturated carboxylic acid, and a monomer represented by the following general formula (2) Units (repeating structural units) are preferred.

(Wherein R ⁴ represents a hydrogen atom or a methyl group, X represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group, an —OAc group, a —CN group, a —CO—R ⁵ group, or —CO It represents ^{-O-R 6} group, Ac represents an acetyl group, ^{R 5} and ^{R 6} represents a hydrogen atom or an organic residue having 1 to 20 carbon atoms.)
The content ratio of the structure other than the lactone ring structure represented by the general formula (1) in the lactone ring-containing polymer structure is a polymer structural unit (repeated structural unit) formed by polymerizing (meth) acrylic acid ester. In this case, it is preferably 10 to 95% by mass, more preferably 10 to 90% by mass, still more preferably 40 to 90% by mass, particularly preferably 50 to 90% by mass, and the hydroxy group-containing monomer is polymerized. In the case of the polymer structural unit to be formed (repeating structural unit), it is preferably 0 to 30% by mass, more preferably 0 to 20% by mass, further preferably 0 to 15% by mass, and particularly preferably 0 to 10% by mass. is there. In the case of a polymer structural unit (repeating structural unit) formed by polymerizing an unsaturated carboxylic acid, it is preferably 0 to 30% by mass, more preferably 0 to 20% by mass, and still more preferably 0 to 15% by mass. Especially preferably, it is 0-10 mass%. Furthermore, in the case of a polymer structural unit (repeating structural unit) formed by polymerizing the monomer represented by the general formula (2), preferably 0 to 30% by mass, more preferably 0 to 20% by mass, More preferably, it is 0-15 mass%, Most preferably, it is 0-10 mass%.

  The method for producing the lactone ring-containing polymer is not particularly limited. For example, after the polymer (a) having a hydroxy group and an ester group in the molecular chain is obtained by a polymerization step, the obtained heavy polymer is obtained. It can be obtained by carrying out a lactone cyclization condensation step for introducing a lactone ring structure into the polymer by heat-treating the compound (a).

  In the polymerization step, a polymer having a hydroxy group and an ester group in the molecular chain is obtained by performing a polymerization reaction of a monomer component containing a monomer represented by the following general formula (3).

(Wherein R ⁷ and R ⁸ each independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms.)
Examples of the monomer represented by the general formula (3) include methyl 2- (hydroxymethyl) acrylate, ethyl 2- (hydroxymethyl) acrylate, isopropyl 2- (hydroxymethyl) acrylate, 2- ( Hydroxymethyl) n-butyl acrylate, t-butyl 2- (hydroxymethyl) acrylate, methallyl alcohol and the like. These monomers may be used alone or in combination of two or more.

  Of these monomers, methyl 2- (hydroxymethyl) acrylate and ethyl 2- (hydroxymethyl) acrylate are preferred, and methyl 2- (hydroxymethyl) acrylate is highly effective in improving heat resistance. Is particularly preferred.

  The content ratio of the monomer represented by the general formula (3) in the monomer component provided in the polymerization step is preferably 5 to 90% by mass, more preferably 10 to 70% by mass, and still more preferably 10 to 60%. It is 10 mass%, Most preferably, it is 10-50 mass%. When the content ratio of the monomer represented by the general formula (3) is less than 5% by mass, the heat resistance, solvent resistance, and surface hardness of the obtained polymer may be lowered. On the other hand, when the content ratio of the monomer represented by the general formula (3) exceeds 90% by mass, gelation occurs in the polymerization step or the lactone cyclization condensation step, and the molding processability of the obtained polymer is low. May decrease.

  The monomer component used in the polymerization step may include a monomer other than the monomer represented by the general formula (3). Such a monomer is not particularly limited. For example, (meth) acrylic acid ester, hydroxy group-containing monomer, unsaturated carboxylic acid, and the following general formula (2) are used. And the like. These monomers may be used alone or in combination of two or more.

(Wherein R ⁴ represents a hydrogen atom or a methyl group, X represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group, an —OAc group, a —CN group, a —CO—R ⁵ group, or —CO It represents ^{-O-R 6} group, Ac represents an acetyl group, ^{R 5} and ^{R 6} represents a hydrogen atom or an organic residue having 1 to 20 carbon atoms.)
The (meth) acrylic acid ester is not particularly limited as long as it is a (meth) acrylic acid ester other than the monomer represented by the general formula (3). For example, methyl acrylate, acrylic acid Acrylic esters such as ethyl, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, cyclohexyl acrylate, benzyl acrylate; methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, methacryl And methacrylic acid esters such as isobutyl acid, t-butyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate. These (meth) acrylic acid esters may be used alone or in combination of two or more. Among these (meth) acrylic acid esters, methyl methacrylate is particularly preferable because the obtained polymer has excellent heat resistance and transparency.

  When using a (meth) acrylic acid ester other than the monomer represented by the general formula (3), the content ratio in the monomer component to be subjected to the polymerization step is sufficient to exert the effect of the present invention. The content is preferably 10 to 95% by mass, more preferably 10 to 90% by mass, still more preferably 40 to 90% by mass, and particularly preferably 50 to 90% by mass.

  The hydroxy group-containing monomer is not particularly limited as long as it is a hydroxy group-containing monomer other than the monomer represented by the general formula (3). For example, α-hydroxymethylstyrene, α-hydroxyethyl styrene, 2- (hydroxyalkyl) acrylic acid ester such as methyl 2- (hydroxyethyl) acrylate; 2- (hydroxyalkyl) acrylic acid such as 2- (hydroxyethyl) acrylic acid; . These hydroxy group-containing monomers may be used alone or in combination of two or more.

  When using a hydroxyl group-containing monomer other than the monomer represented by the general formula (3), the content ratio in the monomer component to be used in the polymerization step is sufficient to exert the effect of the present invention. The content is preferably 0 to 30% by mass, more preferably 0 to 20% by mass, still more preferably 0 to 15% by mass, and particularly preferably 0 to 10% by mass.

  Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, crotonic acid, α-substituted acrylic acid, α-substituted methacrylic acid and the like. These unsaturated carboxylic acids may be used alone or in combination of two or more. Among these unsaturated carboxylic acids, acrylic acid and methacrylic acid are particularly preferable because the effects of the present invention are sufficiently exhibited.

  When using an unsaturated carboxylic acid, the content ratio in the monomer component to be subjected to the polymerization step is preferably 0 to 30% by mass, more preferably 0 to 20% by mass, in order to sufficiently exhibit the effects of the present invention. %, More preferably 0 to 15% by mass, particularly preferably 0 to 10% by mass.

  Examples of the monomer represented by the general formula (2) include styrene, vinyl toluene, α-methyl styrene, acrylonitrile, methyl vinyl ketone, ethylene, propylene, and vinyl acetate. These monomers may be used alone or in combination of two or more. Of these monomers, styrene and α-methylstyrene are particularly preferable because the effects of the present invention are sufficiently exhibited.

  When using the monomer represented by the general formula (2), the content ratio in the monomer component to be subjected to the polymerization step is preferably 0 to 30% by mass in order to sufficiently exhibit the effects of the present invention. More preferably, it is 0-20 mass%, More preferably, it is 0-15 mass%, Most preferably, it is 0-10 mass%.

  As a form of the polymerization reaction for polymerizing the monomer component to obtain a polymer having a hydroxy group and an ester group in the molecular chain, a polymerization form using a solvent is preferable, and solution polymerization is particularly preferable. .

  Although the polymerization temperature and the polymerization time vary depending on the type and ratio of the monomer used, for example, the polymerization temperature is preferably 0 to 150 ° C., the polymerization time is 0.5 to 20 hours, and more preferably. Has a polymerization temperature of 80 to 140 ° C. and a polymerization time of 1 to 10 hours.

  In the case of polymerization using a solvent, the polymerization solvent is not particularly limited. For example, aromatic hydrocarbon solvents such as toluene, xylene, and ethylbenzene; ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone; tetrahydrofuran And ether solvents such as These solvents may be used alone or in combination of two or more. Moreover, since the residual volatile matter of the lactone ring containing polymer finally obtained will increase when the boiling point of a solvent is too high, the solvent whose boiling point is 50-200 degreeC is preferable.

  During the polymerization reaction, a polymerization initiator may be added as necessary. The polymerization initiator is not particularly limited. For example, cumene hydroperoxide, diisopropylbenzene hydroperoxide, di-t-butyl peroxide, lauroyl peroxide, benzoyl peroxide, t-butylperoxyisopropyl Organic peroxides such as carbonate and t-amylperoxy-2-ethylhexanoate; 2,2′-azobis (isobutyronitrile), 1,1′-azobis (cyclohexanecarbonitrile), 2,2 ′ -Azo compounds such as azobis (2,4-dimethylvaleronitrile); These polymerization initiators may be used alone or in combination of two or more. The amount of the polymerization initiator used is not particularly limited as long as it is appropriately set according to the combination of monomers and reaction conditions.

  When performing the polymerization, it is preferable to control the concentration of the produced polymer in the polymerization reaction mixture to be 50% by mass or less in order to suppress gelation of the reaction solution. Specifically, when the concentration of the produced polymer in the polymerization reaction mixture exceeds 50% by mass, it is preferable that the polymerization solvent is appropriately added to the polymerization reaction mixture and controlled to be 50% by mass or less. . The concentration of the produced polymer in the polymerization reaction mixture is more preferably 45% by mass or less, and further preferably 40% by mass or less. In addition, since productivity will fall when the density | concentration of the produced | generated polymer in a polymerization reaction mixture is too low, the density | concentration of the produced | generated polymer in a polymerization reaction mixture becomes like this. Preferably it is 10 mass% or more, More preferably, it is 20 mass%. That's it.

  The form in which the polymerization solvent is appropriately added to the polymerization reaction mixture is not particularly limited, and for example, the polymerization solvent may be added continuously or the polymerization solvent may be added intermittently. By controlling the concentration of the produced polymer in the polymerization reaction mixture in this way, the gelation of the reaction solution can be more sufficiently suppressed, and in particular, to increase the lactone ring content and improve the heat resistance. Even when the ratio between the hydroxy group and the ester group in the molecular chain is increased, gelation can be sufficiently suppressed. The polymerization solvent to be added may be, for example, the same type of solvent used during the initial charging of the polymerization reaction or a different type of solvent, but the solvent used during the initial charging of the polymerization reaction. It is preferable to use the same type of solvent. Moreover, the polymerization solvent to be added may be only one kind of single solvent or two or more kinds of mixed solvents.

  The polymerization reaction mixture obtained when the above polymerization step is completed usually contains a solvent in addition to the obtained polymer, but it is necessary to completely remove the solvent and take out the polymer in a solid state. Rather, it is preferably introduced into the subsequent lactone cyclization condensation step in a state containing a solvent. If necessary, after taking out in a solid state, a solvent suitable for the subsequent lactone cyclization condensation step may be added again.

  The polymer obtained in the polymerization step is a polymer (a) having a hydroxy group and an ester group in the molecular chain, and the weight average molecular weight of the polymer (a) is preferably 1,000 to 2,000. 5,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000, and particularly preferably 50,000 to 500,000. The polymer (a) obtained in the polymerization step is subjected to heat treatment in the subsequent lactone cyclization condensation step, whereby a lactone ring structure is introduced into the polymer to become a lactone ring-containing polymer.

  The reaction for introducing a lactone ring structure into the polymer (a) is a reaction in which a hydroxy group and an ester group present in the molecular chain of the polymer (a) are cyclized and condensed to form a lactone ring structure by heating. The alcohol is by-produced by the cyclized condensation. By forming the lactone ring structure in the molecular chain of the polymer (in the main skeleton of the polymer), high heat resistance is imparted. If the reaction rate of the cyclization condensation reaction leading to the lactone ring structure is insufficient, the heat resistance will not be improved sufficiently, or a condensation reaction will occur during the molding due to the heat treatment during molding, and the resulting alcohol will be contained in the molded product. May exist as bubbles or silver streaks.

  The lactone ring-containing polymer obtained in the lactone cyclization condensation step preferably has a lactone ring structure represented by the following general formula (1).

(In the formula, R ¹ , R ² and R ³ each independently represents a hydrogen atom or an organic residue having 1 to 20 carbon atoms. The organic residue may contain an oxygen atom.)
The method for heat-treating the polymer (a) is not particularly limited, and a conventionally known method can be used. For example, you may heat-process the polymerization reaction mixture containing the solvent obtained by the superposition | polymerization process as it is. Or you may heat-process using a ring-closure catalyst as needed in presence of a solvent. Or heat processing can also be performed using the heating furnace and reaction apparatus provided with the vacuum apparatus or devolatilization apparatus for removing a volatile component, the extruder provided with the devolatilization apparatus, etc.

  In carrying out the cyclization condensation reaction, in addition to the polymer (a), another thermoplastic resin may coexist. When performing the cyclization condensation reaction, if necessary, an esterification catalyst or a transesterification catalyst such as p-toluenesulfonic acid generally used as a catalyst for the cyclization condensation reaction may be used. , Organic carboxylic acids such as propionic acid, benzoic acid, acrylic acid and methacrylic acid; an organic phosphorus compound may be used as a catalyst. Furthermore, as disclosed in, for example, Japanese Patent Application Laid-Open Nos. 61-254608 and 61-261303, basic compounds, organic carboxylates, carbonates, and the like may be used.

  Among these cyclization condensation reaction catalysts, an organophosphorus compound is preferable because the cyclization condensation reaction rate can be improved and coloring of the resulting lactone ring-containing polymer can be greatly reduced. Furthermore, by using an organophosphorus compound as a catalyst for the cyclization condensation reaction, it is possible to suppress a decrease in molecular weight that can occur when a devolatilization step described later is used in combination, and to impart excellent mechanical strength.

  Examples of the organic phosphorus compound that can be used as a catalyst in the cyclocondensation reaction include alkyl (aryl) phosphonous acids such as methylphosphonous acid, ethylphosphonous acid, and phenylphosphonous acid (however, Tautomers (which may be alkyl (aryl) phosphinic acid) and monoesters or diesters thereof; dimethylphosphinic acid, diethylphosphinic acid, diphenylphosphinic acid, phenylmethylphosphinic acid, phenylethylphosphinic acid, etc. Dialkyl (aryl) phosphinic acids and esters thereof; alkyl (aryl) phosphonic acids such as methyl phosphonic acid, ethyl phosphonic acid, trifluoromethyl phosphonic acid, phenyl phosphonic acid, and monoesters or diesters thereof; methyl phosphite Acids, alkyl (aryl) phosphinic acids such as ethylphosphinic acid, phenylphosphinic acid and their esters; methyl phosphite, ethyl phosphite, phenyl phosphite, dimethyl phosphite, diethyl phosphite, Phosphorous acid monoester, diester or triester such as diphenyl phosphite, trimethyl phosphite, triethyl phosphite, triphenyl phosphite; methyl phosphate, ethyl phosphate, 2-ethylhexyl phosphate, octyl phosphate , Isodecyl phosphate, lauryl phosphate, stearyl phosphate, isostearyl phosphate, phenyl phosphate, dimethyl phosphate, diethyl phosphate, di-2-ethylhexyl phosphate, diisodecyl phosphate, dilauryl phosphate, distearyl phosphate , Diisostearyl phosphate, diphenyl phosphate, triphosphate Phosphoric monoesters, diesters or triesters such as chill, triethyl phosphate, triisodecyl phosphate, trilauryl phosphate, tristearyl phosphate, triisostearyl phosphate, triphenyl phosphate; methylphosphine, ethylphosphine, phenylphosphine, Mono-, di- or tri-alkyl (aryl) phosphine such as dimethylphosphine, diethylphosphine, diphenylphosphine, trimethylphosphine, triethylphosphine, triphenylphosphine; methyldichlorophosphine, ethyldichlorophosphine, phenyldichlorophosphine, dimethylchlorophosphine, Alkyl (aryl) halogen phosphines such as diethyl chlorophosphine and diphenylchlorophosphine; Mono-, di- or tri-alkyl (aryl) phosphines such as sphin, phenyl phosphine oxide, dimethyl phosphine oxide, diethyl phosphine oxide, diphenyl phosphine oxide, trimethyl phosphine oxide, triethyl phosphine oxide, triphenyl phosphine oxide; tetramethyl chloride And halogenated tetraalkyl (aryl) phosphonium such as phosphonium, tetraethylphosphonium chloride, and tetraphenylphosphonium chloride. These organic phosphorus compounds may be used alone or in combination of two or more. Among these organophosphorus compounds, since the catalytic activity is high and the colorability is low, alkyl (aryl) phosphonous acid, phosphorous acid monoester or diester, phosphoric acid monoester or diester, and alkyl (aryl) phosphonic acid Preferably, alkyl (aryl) phosphonous acid, phosphorous acid monoester or diester, phosphoric acid monoester or diester is more preferable, and alkyl (aryl) phosphonous acid, phosphoric acid monoester or diester is particularly preferable.

  Although the usage-amount of the catalyst used in the case of a cyclization condensation reaction is not specifically limited, For example, Preferably it is 0.001-5 mass% with respect to a polymer (a), More preferably, it is 0.01. -2.5 mass%, More preferably, it is 0.01-1 mass%, Most preferably, it is 0.05-0.5 mass%. When the amount of the catalyst used is less than 0.001% by mass, the reaction rate of the cyclization condensation reaction may not be sufficiently improved. On the other hand, when the amount of the catalyst used exceeds 5% by mass, the obtained polymer may be colored or the polymer may be cross-linked to make melt molding difficult.

  The addition timing of the catalyst is not particularly limited. For example, the catalyst may be added at the beginning of the reaction, may be added during the reaction, or may be added in both of them.

  It is preferable to carry out the cyclization condensation reaction in the presence of a solvent and to use a devolatilization step in combination with the cyclization condensation reaction. In this case, a mode in which the devolatilization step is used throughout the cyclization condensation reaction and a mode in which the devolatilization step is not used over the entire cyclization condensation reaction but only in a part of the process. In the method using the devolatilization step in combination, the alcohol produced as a by-product in the condensation cyclization reaction is forcibly devolatilized and removed, so that the equilibrium of the reaction is advantageous for the production side.

  The devolatilization step refers to a step of removing volatile components such as solvents and residual monomers and alcohol by-produced by a cyclization condensation reaction leading to a lactone ring structure under reduced pressure heating conditions as necessary. . If this removal treatment is insufficient, residual volatile components in the obtained polymer increase, and coloring may occur due to deterioration during molding, and molding defects such as bubbles and silver streaks may occur.

  In the case of using a devolatilization step throughout the cyclization condensation reaction, the apparatus to be used is not particularly limited. For example, in order to more effectively perform the present invention, a devolatilization step and devolatilization are performed. It is preferable to use a devolatilizer comprising a tank and an extruder with a vent, or a devolatilizer and an extruder arranged in series, and a devolatilizer comprising a heat exchanger and a devolatilizer or an extrusion with a vent It is more preferable to use a machine.

  The reaction treatment temperature in the case of using a devolatilizer comprising a heat exchanger and a devolatilizer is preferably 150 to 350 ° C, more preferably 200 to 300 ° C. If the reaction treatment temperature is less than 150 ° C., the cyclization condensation reaction may be insufficient and the residual volatile matter may increase. On the other hand, when the reaction processing temperature exceeds 350 ° C., the obtained polymer may be colored or decomposed.

  The reaction treatment pressure when using a devolatilizer comprising a heat exchanger and a devolatilizer is preferably 931 to 1.33 hPa (700 to 1 mmHg), more preferably 798 to 66.5 hPa (600 to 50 mmHg). . When the reaction treatment pressure exceeds 931 hPa (700 mmHg), volatile components including alcohol may easily remain. On the other hand, when the reaction treatment pressure is less than 1.33 hPa (1 mmHg), industrial implementation may be difficult.

  When using the extruder with a vent, one or a plurality of vents may be used, but it is preferable to have a plurality of vents.

  The reaction processing temperature when using the extruder with a vent is preferably 150 to 350 ° C, more preferably 200 to 300 ° C. If the reaction treatment temperature is less than 150 ° C., the cyclization condensation reaction may be insufficient and the residual volatile matter may increase. On the other hand, when the reaction processing temperature exceeds 350 ° C., the obtained polymer may be colored or decomposed.

  The reaction treatment pressure when using the extruder with a vent is preferably 931 to 1.33 hPa (700 to 1 mmHg), more preferably 798 to 13.3 hPa (600 to 10 mmHg). When the reaction treatment pressure exceeds 931 hPa (700 mmHg), volatile components including alcohol may easily remain. On the other hand, when the reaction treatment pressure is less than 1.33 hPa (1 mmHg), industrial implementation may be difficult.

  In the case of a form in which a devolatilization step is used throughout the cyclization condensation reaction, the physical properties of the lactone ring-containing polymer obtained may deteriorate under severe heat treatment conditions, as will be described later. It is preferable to carry out by using an extruder with a vent etc. on the conditions as mild as possible.

  In the case where the devolatilization step is used in combination throughout the cyclization condensation reaction, the polymer (a) obtained in the polymerization step is preferably introduced into the cyclization condensation reaction device together with a solvent. Depending on the situation, it may be passed once again through a cyclocondensation reaction apparatus such as a vented extruder.

  You may perform the form used together only in a part of process, without using a devolatilization process over the whole process of cyclization condensation reaction. For example, the apparatus for producing the polymer (a) is further heated, and if necessary, a part of the devolatilization step is used together to advance the cyclization condensation reaction to some extent in advance, followed by the devolatilization step. Is a form in which a cyclization condensation reaction is simultaneously used to complete the reaction.

  In the form of using the devolatilization step throughout the cyclization condensation reaction described above, for example, when the polymer (a) is heat-treated at a high temperature of about 250 ° C. or higher using a twin-screw extruder. Depending on the thermal history, partial decomposition or the like may occur before the cyclization condensation reaction occurs, and the physical properties of the obtained lactone ring-containing polymer may be lowered. Therefore, if the cyclization condensation reaction is allowed to proceed to some extent before the cyclization condensation reaction using the devolatilization process at the same time, the reaction conditions in the latter half can be relaxed and the physical properties of the resulting lactone ring-containing polymer are reduced. Is preferable. As a particularly preferred form, for example, a form in which the devolatilization step is started after a lapse of time from the start of the cyclization condensation reaction, that is, a hydroxy group present in the molecular chain of the polymer (a) obtained in the polymerization step A form in which an ester group is preliminarily subjected to a cyclization condensation reaction to increase the cyclization condensation reaction rate to some extent and then a cyclization condensation reaction using a devolatilization step simultaneously is performed. Specifically, for example, a cyclization condensation reaction is allowed to proceed to a certain reaction rate in the presence of a solvent in advance using a kettle reactor, and then a reactor equipped with a devolatilizer, for example, heat exchange Preferred is a mode in which the cyclization condensation reaction is completed with a devolatilizer comprising a vessel and a devolatilization tank, an extruder with a vent, or the like. In particular, in the case of this form, it is more preferable that a catalyst for the cyclization condensation reaction is present.

  As described above, the hydroxy group and the ester group present in the molecular chain of the polymer (a) obtained in the polymerization step are preliminarily subjected to a cyclization condensation reaction to increase the cyclization condensation reaction rate to some extent, The method of carrying out the cyclization condensation reaction using the devolatilization step at the same time is a preferred mode for obtaining a lactone ring-containing polymer in the present invention. With this form, a lactone ring-containing polymer having a higher glass transition temperature, a higher cyclization condensation reaction rate, and excellent heat resistance can be obtained. In this case, as a measure of the cyclization condensation reaction rate, for example, the mass reduction rate in the range of 150 to 300 ° C. in the dynamic TG measurement shown in the examples is preferably 2% or less, more preferably 1.5% or less. More preferably, it is 1% or less.

  The reactor that can be employed in the cyclization condensation reaction performed in advance before the cyclization condensation reaction using the devolatilization process at the same time is not particularly limited. For example, an autoclave, a kettle reactor, a heat exchanger And a devolatilizer comprising a devolatilization tank, and a vented extruder suitable for a cyclization condensation reaction using a devolatilization step at the same time can also be used. Of these reactors, an autoclave and a kettle reactor are particularly preferable. However, even when a reactor such as an extruder with a vent is used, the autoclave or kettle can be adjusted by adjusting the temperature conditions, barrel conditions, screw shape, screw operating conditions, etc. It is possible to carry out the cyclization condensation reaction in the same state as the reaction state in the type reactor.

  In the case of the cyclization condensation reaction carried out in advance before the cyclization condensation reaction using the devolatilization step at the same time, for example, a mixture containing the polymer (a) and the solvent obtained in the polymerization step is used as (i) a catalyst. And (ii) a method of performing a heat reaction without a catalyst, a method of performing the above (i) or (ii) under pressure, and the like.

  The “mixture containing the polymer (a) and the solvent” introduced into the cyclization condensation reaction in the lactone cyclization condensation step refers to the polymerization reaction mixture itself obtained in the polymerization step or the solvent once removed. It means a mixture obtained by re-adding a solvent suitable for the cyclization condensation reaction later.

  The solvent that can be re-added in the cyclization condensation reaction that is carried out in advance before the cyclization condensation reaction using the devolatilization step at the same time is not particularly limited. For example, aromatic carbonization such as toluene, xylene, ethylbenzene, etc. Hydrogens; ketones such as methyl ethyl ketone and methyl isobutyl ketone; chloroform, dimethyl sulfoxide, tetrahydrofuran; and the like. These solvents may be used alone or in combination of two or more. Preferably, it is the same kind of solvent as the solvent used in the polymerization step.

  Examples of the catalyst added in the method (i) include commonly used esterification catalysts such as p-toluenesulfonic acid or transesterification catalysts, basic compounds, organic carboxylates, and carbonates. In the present invention, it is preferable to use the organophosphorus compound described above. The addition timing of the catalyst is not particularly limited. For example, the catalyst may be added at the beginning of the reaction, may be added during the reaction, or may be added in both of them. The addition amount of the catalyst is not particularly limited, but for example, is preferably 0.001 to 5% by mass, more preferably 0.01 to 2.5% by mass with respect to the mass of the polymer (a). More preferably, it is 0.01-1 mass%, Most preferably, it is 0.05-0.5 mass%. Although the heating temperature and heating time of method (i) are not particularly limited, for example, the heating temperature is preferably room temperature to 180 ° C., more preferably 50 to 150 ° C., and the heating time is preferably 1 to 20 hours, more preferably 2 to 10 hours. If the heating temperature is less than room temperature or the heating time is less than 1 hour, the cyclization condensation reaction rate may be lowered. On the other hand, if the heating temperature exceeds 180 ° C. or the heating time exceeds 20 hours, the resin may be colored or decomposed.

  Examples of the method (ii) include a method of heating the polymerization reaction mixture obtained in the polymerization step as it is using a pressure-resistant kettle reactor or the like. Although the heating temperature and heating time of method (ii) are not particularly limited, for example, the heating temperature is preferably 100 to 180 ° C, more preferably 150 to 180 ° C, and the heating time is preferably 1 to 20 hours, more preferably 2 to 10 hours. When the heating temperature is less than 100 ° C. or the heating time is less than 1 hour, the cyclization condensation reaction rate may be lowered. Conversely, if the heating temperature exceeds 180 ° C. or the heating time exceeds 20 hours, the resin may be colored or decomposed.

  In any of the methods (i) and (ii), there is no problem even under pressure depending on conditions.

  In the case of the cyclization condensation reaction performed in advance before the cyclization condensation reaction using the devolatilization step at the same time, there is no problem even if part of the solvent volatilizes spontaneously during the reaction.

  The mass reduction rate within the range of 150 to 300 ° C. in the dynamic TG measurement at the end of the cyclization condensation reaction performed in advance before the cyclization condensation reaction simultaneously used in combination with the devolatilization step, that is, immediately before the start of the devolatilization step is Preferably it is 2% or less, More preferably, it is 1.5% or less, More preferably, it is 1% or less. When the mass reduction rate exceeds 2%, the cyclization condensation reaction rate does not rise to a sufficiently high level even if the cyclization condensation reaction is performed simultaneously with the devolatilization step, and the physical properties of the resulting lactone ring-containing polymer. May decrease. In addition, when performing said cyclization condensation reaction, in addition to a polymer (a), you may coexist other thermoplastic resins.

  The hydroxy group and the ester group present in the molecular chain of the polymer (a) obtained in the polymerization step are preliminarily subjected to a cyclization condensation reaction to increase the cyclization condensation reaction rate to some extent. In the case of a form in which a combined cyclization condensation reaction is carried out, a polymer obtained by a cyclization condensation reaction carried out in advance (a polymer in which at least a part of a hydroxy group and an ester group present in a molecular chain is subjected to a cyclization condensation reaction) And the solvent may be introduced into the cyclization condensation reaction using the devolatilization step at the same time, and if necessary, the polymer (at least a part of the hydroxy group and ester group present in the molecular chain is present). It may be introduced into a cyclization condensation reaction in which a devolatilization step is used at the same time after other treatments such as re-addition of a solvent after the cyclization condensation reaction polymer is isolated.

  The devolatilization step is not limited to being completed at the same time as the cyclization condensation reaction, and may be completed after a lapse of time from the completion of the cyclization condensation reaction.

  The weight average molecular weight of the lactone ring-containing polymer is preferably 1,000 to 2,000,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000, particularly preferably. 50,000 to 500,000.

  The lactone ring-containing polymer preferably has a mass reduction rate in the range of 150 to 300 ° C. in dynamic TG measurement of 1% or less, more preferably 0.5% or less, and still more preferably 0.3% or less.

  Since the lactone ring-containing polymer has a high cyclization condensation reaction rate, it is possible to avoid the disadvantage that bubbles and silver streaks enter the molded product after molding. Furthermore, since the lactone ring structure is sufficiently introduced into the polymer due to the high cyclization condensation reaction rate, the obtained lactone ring-containing polymer has sufficiently high heat resistance.

  The lactone ring-containing polymer has a coloring degree (YI) of preferably 6 or less, more preferably 3 or less, still more preferably 2 or less, and particularly preferably 1 or less when a chloroform solution having a concentration of 15% by mass is used. . If the degree of coloring (YI) exceeds 6, transparency may be impaired by coloring, and it may not be used for the intended purpose.

  The lactone ring-containing polymer has a 5% mass reduction temperature in thermal mass spectrometry (TG) of preferably 330 ° C. or higher, more preferably 350 ° C. or higher, and still more preferably 360 ° C. or higher. The 5% mass reduction temperature in thermal mass spectrometry (TG) is an index of thermal stability, and if it is less than 330 ° C., sufficient thermal stability may not be exhibited.

  The lactone ring-containing polymer has a glass transition temperature (Tg) of preferably 110 ° C. or higher, more preferably 115 ° C. or higher, and further preferably 120 ° C. or higher.

  The total amount of residual volatile components contained in the lactone ring-containing polymer is preferably 1,500 ppm or less, more preferably 1,000 ppm or less. If the total amount of residual volatile components exceeds 1,500 ppm, it may be colored due to alteration during molding, foaming, or molding defects such as silver streak.

  The lactone ring-containing polymer has a total light transmittance of 85% or more, more preferably 88% or more, and still more preferably measured by a method based on ASTM-D-1003 for a molded product obtained by injection molding. 90% or more. The total light transmittance is an index of transparency, and if it is less than 85%, the transparency is lowered and it may not be used for the intended purpose.

  The content ratio of the lactone ring-containing polymer contained in the lactone ring-containing resin film is preferably 50 to 100% by mass, more preferably 60 to 100% by mass, still more preferably 70 to 100% by mass, and particularly preferably 80 to 100%. % By mass. When the content of the lactone ring-containing polymer contained in the lactone ring-containing resin film is less than 50% by mass, the effects of the present invention may not be sufficiently exhibited.

  The lactone ring-containing resin film may contain a polymer other than the lactone ring-containing polymer (hereinafter sometimes referred to as “other polymer”) as another component. Examples of other polymers include olefin polymers such as polyethylene, polypropylene, ethylene-propylene copolymer, poly (4-methyl-1-pentene); halogens such as vinyl chloride, vinylidene chloride, and chlorinated vinyl resins. Acrylic polymers such as polymethyl methacrylate; Styrene polymers such as polystyrene, styrene-methyl methacrylate copolymer, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene block copolymer Polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyamides such as nylon 6, nylon 66 and nylon 610; polyacetals; polycarbonates; polyphenylene oxides; Polyether ether ketone; polysulfones; polyethersulfones; polyoxyethylene benzylidene alkylene; polyamideimide; polybutadiene rubber, rubber-like polymer such as ABS resin or ASA resin containing an acrylic rubber; and the like.

  The content of the other polymer in the lactone ring-containing resin film is preferably 0 to 50% by mass, more preferably 0 to 40% by mass, further preferably 0 to 30% by mass, and particularly preferably 0 to 20% by mass. is there.

  The lactone ring-containing resin film may contain various additives. Examples of additives include hindered phenol-based, phosphorus-based and sulfur-based antioxidants; light-resistant stabilizers, weather-resistant stabilizers, heat stabilizers and other stabilizers; reinforcing materials such as glass fibers and carbon fibers; phenyls UV absorbers such as salicylate, (2,2′-hydroxy-5-methylphenyl) benzotriazole, 2-hydroxybenzophenone; near infrared absorbers; tris (dibromopropyl) phosphate, triallyl phosphate, antimony oxide, etc. Flame retardants; Antistatic agents such as anionic, cationic and nonionic surfactants; Colorants such as inorganic pigments, organic pigments and dyes; Organic fillers and inorganic fillers; Resin modifiers; Organic fillers and inorganic fillers Agents, plasticizers, lubricants, antistatic agents, flame retardants, and the like.

  The structure of the ultraviolet absorber added to the lactone ring-containing resin film is not particularly limited, but an ultraviolet absorber having a hydroxyphenyltriazine skeleton as a chromophore is preferable, and among them, the glass transition temperature is 110 ° C. or higher. 2,4-bis (2,4-dimethylphenyl) -6- [2-hydroxy-4- (3-alkyloxy-2) is highly compatible with other thermoplastic acrylic resins and has excellent absorption characteristics. -Hydroxypropyloxy) -5-α-cumylphenyl] -s-triazine skeleton (alkyloxy; long-chain alkyloxy groups such as octyloxy, nonyloxy, decyloxy, etc.) is more preferred, and is represented by the following formula (4): An ultraviolet absorber containing as a main component an ultraviolet absorber having the structure represented is particularly preferred.

Examples of other ultraviolet absorbers include benzotriazole derivatives, benzophenone derivatives, benzoxazinone derivatives, triazine derivatives, and the like.

  Specific examples of the benzotriazole derivative include 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, and 2- (2-hydroxy- 3,5-dicumylphenyl) benzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2,2'-methylenebis [4- (1,1, 3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2- (2-hydroxy-3,5-di-tert-butylphenyl) benzotriazole, 2- (2- Hydroxy-3,5-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3, -Di-tert-amylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-butylphenyl) benzotriazole, 2- (2-hydroxy-4-octoxyphenyl) benzotriazole, 2,2'-methylenebis [4-cumyl-6-benzotriazolephenyl], 2,2′-p-phenylenebis (1,3-benzoxazin-4-one), 2- [2-hydroxy-3- (3,4,5, 6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole, 3- [3-methyl- (2H-benzotriazol-2-yl) -5-tert-butyl-4-hydroxyphenyl] propionate / polyethylene glycol 300 Reactive organism, 2- (2H-benzotriazol-2-yl) -6- (linear and side chain dode) Syl) -4-methylphenol and the like.

  Specific examples of the benzophenone derivative include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, and 2-hydroxy. -4-methoxy-5-sulfoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxytrihydride benzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4,4'- Tetrahydroxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxy-5-sodiumsulfoxybenzophenone, bis (5-benzoyl-4-hydroxy) -2-methoxyphenyl ) Methane, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-dihydroxy-4-methoxy-2'-carboxybenzophenone and the like.

Specific examples of the benzoxazinone derivative include 2-p-methoxyphenyl (3,1-benzoxazin-4-one), 2-α-naphthyl (3,1-benzoxazin-4-one), 2 -Β-naphthyl (3,1-benzoxazin-4-one), 2-p-phthalimidophenyl (3,1-benzoxazin-4-one), 2,2'-bis (3,1-benzoxazine- 4-one), 2,2 ′-(1,4-diphenylene) bis (4H-3,1-benzoxazinon-4-one), 2,2 ′-(4,4′-diphenylene) bis (3 , 1-benzoxazin-4-one), 2,2 ′-(2,6 or 1,5-dinaphthalene) bis (3,1-benzoxazin-4-one), 1,3,5-tri ( 3,1-benzoxazin-4-one), among them 2,2 ′-(1,4-diphenylene) bis (4H-3,1-benzoxazinon-4-one) (manufactured by Nippon Cytec Industries, Ltd., products from the viewpoint of its high melting point and absorption characteristics Name: Siasorb UV-3638) is preferred.
As the triazine derivative, specifically, 2- [4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl)- 1,3,5-triazine, 2- [4-[(2-hydroxy-3-tridecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1 , 3,5-triazine, 2,4-bis (2,4-dimethylphenyl) -6- (2-hydroxy-4-iso-octylphenyl) -s-triazine, and the like. Moreover, isooctyl substituted tris resorcinol triazine (for example, trade name “CGL777MPAD” manufactured by Ciba Specialty Chemicals), tert-butyl substituted tris resorcinol triazine, cumyl substituted tris resorcinol triazine and the like can be mentioned. These ultraviolet absorbers may be used alone or in combination of two or more.

  The content of the additive in the lactone ring-containing resin film is preferably 0 to 5% by mass, more preferably 0 to 2% by mass, and still more preferably 0 to 0.5% by mass.

  The method for producing the lactone ring-containing resin film is not particularly limited. For example, the lactone ring-containing polymer and other polymers and additives are sufficiently mixed by a conventionally known mixing method. Thus, a resin composition can be prepared and formed into a film. Moreover, it is good also as a stretched film by extending | stretching.

  First, in order to produce a thermoplastic resin composition, for example, the above film raw material is pre-blended with a conventionally known mixer such as an omni mixer, and then the obtained mixture is extrusion kneaded. In this case, the mixer used for extrusion kneading is not particularly limited. For example, a conventionally known mixer such as an extruder such as a single screw extruder or a twin screw extruder or a pressure kneader can be used. .

  Examples of the film forming method include conventionally known film forming methods such as a solution casting method (solution casting method), a melt extrusion method, a calendar method, and a compression molding method. Among these film forming methods, the solution casting method (solution casting method) and the melt extrusion method are preferable.

  Solvents used in the solution casting method (solution casting method) include, for example, aromatic hydrocarbons such as benzene, toluene, xylene; methanol, ethanol, isopropanol, butanol, isobutanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, etc. Alcohols such as ethyl acetate and butyl acetate; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ethers such as tetrahydrofuran and dioxane; halogenation such as dichloromethane, chloroform and carbon tetrachloride Hydrocarbons; dimethylformamide; dimethyl sulfoxide; and the like. These solvents may be used alone or in combination of two or more.

  Examples of the apparatus for performing the solution casting method (solution casting method) include a drum casting machine, a band casting machine, and a spin coater.

  Examples of the melt extrusion method include a T-die method and an inflation method, and the molding temperature at that time is preferably 150 to 350 ° C., more preferably 200 to 300 ° C.

  When forming a film by the T-die method, a roll-shaped film can be obtained by attaching a T-die to the tip of a known single-screw extruder or twin-screw extruder and winding the film extruded into a film. it can. At this time, it is possible to perform uniaxial stretching by appropriately adjusting the temperature of the winding roll and adding stretching in the extrusion direction. Further, simultaneous biaxial stretching, sequential biaxial stretching, and the like can be performed by stretching the film in a direction perpendicular to the extrusion direction.

  The lactone ring-containing resin film may be either an unstretched film or a stretched film. In the case of a stretched film, either a uniaxially stretched film or a biaxially stretched film may be used. In the case of a biaxially stretched film, either a simultaneous biaxially stretched film or a sequential biaxially stretched film may be used. In the case of biaxial stretching, the mechanical strength is improved and the film performance is improved. The thermoplastic resin film containing a lactone ring-containing polymer as a main component can suppress an increase in retardation even when stretched by mixing other thermoplastic resins, and retains optical isotropy. be able to.

  Examples of the stretching method include conventionally known film stretching methods such as a uniaxial stretching method, a sequential biaxial stretching method, and a simultaneous biaxial stretching method.

  The stretching temperature is preferably in the vicinity of the glass transition temperature of a resin composition containing a lactone ring-containing polymer as a main component as a film raw material, specifically, preferably (glass transition temperature-30 ° C.) to (glass Transition temperature + 100 ° C.), more preferably in the range of (glass transition temperature−20 ° C.) to (glass transition temperature + 80 ° C.). If the stretching temperature is less than (glass transition temperature-30 ° C.), a sufficient stretching ratio may not be obtained. On the other hand, when the stretching temperature exceeds (glass transition temperature + 100 ° C.), the resin composition may flow, and stable stretching may not be performed.

  The draw ratio defined by the area ratio is preferably in the range of 1.1 to 25 times, more preferably 1.3 to 10 times. If the draw ratio is less than 1.1 times, the toughness accompanying the drawing may not be improved. On the other hand, when the draw ratio exceeds 25 times, the effect of increasing the draw ratio may not be recognized.

  The stretching speed is unidirectional, preferably 10 to 20,000% / min, more preferably 100 to 10,000% / min. When the stretching speed is less than 10% / min, it takes time to obtain a sufficient stretching ratio, and the production cost may increase. On the other hand, if the stretching speed exceeds 20,000% / min, the stretched film may break.

  In addition, the obtained film can be subjected to a heat treatment (annealing) or the like after the stretching treatment in order to stabilize its optical isotropy and mechanical properties. The conditions for the heat treatment may be appropriately selected similarly to the conditions for the heat treatment performed on a conventionally known stretched film, and are not particularly limited.

  The thickness of the lactone ring-containing resin film is preferably 5 μm to 250 μm, more preferably 10 to 150 μm. Outside this range, problems such as breakage due to changes in process tension or bending in the machining process are less likely to occur, and handling with a hand or machine in the state of each leaf sheet because it has an appropriate bending strength. Problems such as bending sometimes occur, which is not preferable.

  The lactone ring-containing resin film according to the present invention has high transparency, and the visible light transmittance is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more.

  The tensile strength measured based on ASTM-D-882-61T of the lactone ring-containing resin film according to the present invention is preferably 10 MPa or more and less than 100 MPa, more preferably 30 MPa or more and less than 100 MPa. If the tensile strength is less than 10 MPa, sufficient mechanical strength may not be exhibited. On the other hand, if the tensile strength exceeds 100 MPa, the workability may decrease.

  The elongation rate measured based on ASTM-D-882-61T of the lactone ring-containing resin film according to the present invention is preferably 1% or more. Although an upper limit is not specifically limited, Usually, 100% or less is preferable. If the elongation is less than 1%, the toughness is insufficient, which is not preferable.

  The lactone ring-containing resin film according to the present invention has a tensile elastic modulus measured based on ASTM-D-882-61T, preferably 0.5 GPa or more, more preferably 1 GPa or more, and further preferably 2 GPa or more. Although an upper limit is not specifically limited, Usually, 20 GPa or less is preferable. If it is less than 0.5 GPa, sufficient mechanical strength may not be obtained.

The lactone ring-containing resin film has a surface wetting tension of preferably 40 mN / m or more, more preferably 50 mN / m or more, and further preferably 55 mN / m or more. When the surface wetting tension is at least 40 mN / m or more, the adhesion between the lactone ring-containing resin film and the antiglare layer is further improved. In order to adjust the surface wetting tension, for example, corona discharge treatment, ozone spraying, ultraviolet irradiation, flame treatment, chemical treatment, and other conventionally known surface treatments can be performed.
≪Binder≫
As the binder for forming the antiglare layer, a resin curable mainly by ultraviolet rays and electron beams, that is, an ionizing radiation curable resin, a mixture of an ionizing radiation curable resin and a thermoplastic resin and a solvent, a thermosetting resin Three types are used.

  The film forming component of the ionizing radiation curable resin composition is preferably one having an acrylate functional group, such as a relatively low molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, Spiroacetal resin, polybutadiene resin, polythiol polyene resin, oligomers or prepolymers of polyfunctional compounds such as polyhydric alcohols such as (meth) allylates and reactive diluents such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, Monofunctional monomers such as methylstyrene and N-vinylpyrrolidone as well as polyfunctional monomers such as polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate Diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, etc. A large amount can be used. In particular, in the present invention, it is preferable to mix urethane acrylate as an oligomer and dipentaerythritol hexa (meth) acrylate as a monomer.

Further, as a binder for forming the antiglare layer, a solvent-drying resin may be included in the ionizing radiation curable resin as described above. As the solvent-drying resin, a thermoplastic resin is mainly used. As the type of the solvent-drying thermoplastic resin added to the ionizing radiation curable resin, those usually used can be used.
Furthermore, there is an advantage of including a solvent dry resin in the ionizing radiation curable resin composition as follows.

  When an ionizing radiation curable resin composition is applied to a transparent substrate film with a roll coater having a metalling roll, the liquid residual resin film on the surface of the metalling roll flows and becomes streaks, unevenness, etc. over time. However, if the ionizing radiation curable resin composition contains a solvent-drying resin as described above, such coating defects on the coated surface will occur. Can be prevented.

  As a curing method for the ionizing radiation curable resin composition as described above, the curing method for the ionizing radiation curable resin composition can be cured by a normal curing method, that is, irradiation with an electron beam or ultraviolet rays.

  For example, in the case of electron beam curing, 50 to 50 emitted from various electron beam accelerators such as a Cockloft Walton type, a bandegraph type, a resonant transformation type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type An electron beam having an energy of 1000 KeV, preferably 100 to 300 KeV is used. In the case of ultraviolet curing, ultraviolet rays emitted from rays such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, a metal halide lamp, etc. Available.

  Examples of the thermoplastic resin mixed with the ionizing radiation curable resin include senol resin, urea resin, diallyl phthalate resin, melanin resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea. A co-condensation resin, a silicon resin, a polysiloxane resin, or the like is used, and a curing agent such as a crosslinking agent or a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier, or the like is added to these resins as necessary.

≪Photopolymerization initiator≫
In order to make the ionizing radiation curable resin composition into an ultraviolet curable resin composition, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylchuram mono are used as photopolymerization initiators. A mixture of sulfides, thioxanthones, n-butylamine, triethylamine, poly-n-butylphosphine, or the like as a photosensitizer can be used.

≪Fine particles≫
As the fine particles to be contained in the antiglare layer, plastic beads are preferable, and those having particularly high transparency and a difference in refractive index from the matrix resin (binder) are preferable.

  Plastic beads include melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), polycarbonate beads, polyethylene beads, polystyrene beads, polyvinyl chloride beads, etc. Used. As described above, those plastic beads having a particle diameter of 0.5 to 5 μm are appropriately selected and used.

  When the fine particles as the organic filler as described above are added, the organic filler easily settles in the resin composition (binder). Therefore, an inorganic filler such as silica may be added to prevent sedimentation. The more inorganic filler is added, the more effective it is to prevent the organic filler from settling, but it adversely affects the transparency of the coating. Therefore, preferably, an inorganic filler having a particle size of 0.5 μm or less is contained in an amount of less than 0.1% by weight so as not to impair the transparency of the coating film with respect to the binder.

  If an inorganic filler that is an anti-settling agent for preventing the settling of the organic filler is not added, the organic filler is precipitated at the bottom when applied to the transparent substrate film. Good.

  Here, in general, the ionizing radiation curable resin has a refractive index of about 1.5, which is about the same as that of glass, but when the refractive index of the resin used is low in comparison with the refractive index of the fine particles, TiO2 (refractive index; 2.3 to 2.7), Y2O3 (refractive index; 1.87), La2O3 (refractive index; 1.95), ZrO2 (refractive index; 2), which are fine particles having a high refractive index, are used as binders. .05), Al2 O3 (refractive index; 1.63), etc. can be added to such an extent that the diffusibility of the coating film can be maintained, and the refractive index can be increased for adjustment.

≪Anti-glare layer≫
Next, the process of forming an antiglare layer on the surface of the transparent substrate film will be described.

  A binder mixed with fine particles is applied to a lactone ring-containing resin film, which is a transparent substrate film, and the surface is coated with a shaping film having fine irregularities formed on the surface from the coating layer. When the binder is an electron beam or an ultraviolet curable resin, the electron beam or ultraviolet ray is irradiated through the shaping film, and when the binder is a solvent-drying resin, it is heated. After curing, the moldable film is peeled off from the cured antiglare layer.

  If it does in this way, a glare-proof layer will be in a smooth state as a whole, and the fine unevenness | corrugation previously formed in the shaping film will be shaped.

  Therefore, the surface of the diffusion layer can be made smoother as compared with a case where a liquid binder mixed with fine particles is simply applied.

  Next, an example of an embodiment in which the transmissive display device according to the present invention is a liquid crystal display device will be described.

  The liquid crystal display device is a transmissive liquid crystal display device in which a polarizing plate, a liquid crystal panel, and a polarizing plate are laminated in this order, and a backlight is disposed on the back side of the polarizing plate.

  Liquid crystal modes used in the liquid crystal panel in the liquid crystal display device include twisted nematic type (TN), super twisted nematic type (STN), guest-host type (GH), phase transition type (PC), and polymer dispersion type. Any of (PDLC) etc. may be sufficient.

  The liquid crystal drive mode may be either a simple matrix type or an active matrix type. In the case of the active matrix type, a driving method such as TFT, MIM, etc. is adopted.

  Further, the liquid crystal panel may be either a color type or a monochrome type.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, but may be appropriately modified within a range that can meet the purpose described above and below. It is also possible to implement, and they are all included in the technical scope of the present invention.

≪Evaluation method≫
<Particle size of fine particles>
Measurement was performed using a Coulter Multisizer (manufactured by Beckman Coulter).

<Refractive index of fine particles>
After weighing 0.5 g of particles into a 100 cc flask and adding 40 g of carbon disulfide, the mixture was sufficiently stirred at room temperature with a magnetic stirrer to prepare a mixed solution. When ethanol is added dropwise to the mixed solution with a pipette, the initially cloudy liquid gradually becomes transparent. The point judged to be transparent by visual inspection is defined as the end point. A mixed solvent corresponding to the weight ratio of carbon disulfide and ethanol in the particle dispersion at the end point was separately prepared, and the refractive index of the mixed solvent was measured with an Abbe refractometer (manufactured by Atago Co., Ltd.). Is the refractive index of the particles.

<10-point average roughness (Rz)>
Based on JIS B0601, it measured with the laser microscope (VK-9710, the Keyence company make).

<Haze>
Based on JIS K7105, it measured using the haze meter (NDH2000, Nippon Denshoku Industries Co., Ltd.).

<Scintillation>
It was attached to a display having an image with a pixel pitch of 180 μm, which is a high-definition image, and the state of the image was visually evaluated.
Evaluation criteria ○: Good without flickering ×: Flickering in image <Maximum brightness variation>
Measurement was performed using a microgloss meter. Between the light emitting part (halogen lamp) and the light receiving part (photomal), a black matrix having a grid arrangement with a black stripe line width of 30 μm and an opening of 100 μm is installed perpendicularly to the optical axis, and the surface to be evaluated is protected. The dazzling film has an uneven surface facing the light receiving part. The photomultiplier voltage is fixed at 450V, the amplifier gain is fixed, and the black matrix / antiglare film laminate is moved in the direction perpendicular to the optical axis at a speed of 2 μm / sec. The luminance was measured, and the difference between the maximum luminance and the minimum luminance was defined as the maximum luminance variation.

<Transparent definition>
In accordance with JIS K7105, the transmission clearness is measured by passing through optical combs having widths of 2 mm, 1 mm, 0.5 mm, and 0.125 mm using “Image clarity tester ICM-1T” manufactured by Suga Test Instruments Co., Ltd. The transmission definition corresponding to the comb was measured. The sum of the values at the four points was determined as the transmission clarity.

<Weather resistance>
The test was conducted using an ultra-accelerated weathering tester manufactured by Iwasaki Electric Co., Ltd., and evaluation was performed based on the amount of change from the initial value of Δb ^* value after 100 hours under the condition of 100 mW / cm 2.
Evaluation criteria ○: Change amount is less than 5.0% ×: Change amount is 5.0% or more <Solvent resistance>
The antiglare film (70 mm × 70 mm) was immersed in methanol for 10 minutes, and then the film taken out was evaluated visually.
Evaluation criteria ○: Not dissolved at all ×: Dissolved completely or partially <Pencil hardness>
A pencil scratch test was performed in accordance with JIS K5600-5-4, and the scratch was evaluated.

<Film surface potential>
Under an environment of 23 ° C. and 50% RH, the anti-glare films were rubbed together 10 times and measured using a surface potentiometer (FMX-003, manufactured by SIMCO).
Evaluation criteria ○: Less than 3 kV Δ: 3 kV or more, 5 kV or less ×: More than 5 kV << Example of Fine Particle Synthesis >>
<Synthesis Example 1>
In a four-necked flask equipped with a synthetic cooling tube, a thermometer, and a dripping port for polymer seed particles (K-1), 90 g of ion-exchanged water, 10 g of styrene, 0.5 g of n-decyl mercaptan, and 0.1 g of NaCl are added. Nitrogen was passed for 1 hour to replace the nitrogen in the reactor. Thereafter, the temperature of the reaction solution was raised to 70 ° C., and then 0.1 g of potassium persulfate dissolved in a small amount of ion-exchanged water was poured into the reaction system using a syringe. Thereafter, the reaction was carried out at 70 ° C. for 24 hours. After completion of the reaction, the obtained emulsion was subjected to solid-liquid separation, and the obtained cake was washed with ion-exchanged water and then with methanol. When the particle diameter of the obtained polymer seed particles (K-1) was measured by a Coulter Multisizer (manufactured by Beckman Coulter, Inc.), the average particle diameter was 0.7 μm and the coefficient of variation was 3.0%.

In a four-necked flask equipped with a synthetic condenser tube, a thermometer, and a dripping port for resin particles (S-1), 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 0.18 g of styrene, 0.07 g of methyl methacrylate, 0.03 g of ethylene glycol dimethacrylate, and 0.01 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-1). It was. The average particle diameter of the resin particles (S-1) is 1.3 μm, the coefficient of variation is 4.2%, and the refractive index is 1.60.

<Synthesis Example 2>
Polymer particle (K-1) 0.5g, ion-exchanged water 50g, sodium lauryl sulfate 0.05g in a four-necked flask equipped with a synthetic condenser tube of resin particles (S-2), a thermometer, and a dripping port Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, a solution of 1.58 g of styrene, 0.03 g of ethylene glycol dimethacrylate and 0.01 g of benzoyl peroxide was added to a solution in which 0.1 part of sodium lauryl sulfate was dissolved in 50 g of ion-exchanged water as an emulsifier, and the monomer was added using a homogenizer. The emulsion was adjusted, and the resulting monomer emulsion was added to the emulsion of the polymer seed particles, and further stirred. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum dried at 80 ° C. for 12 hours to obtain resin particles (S-2). It was. The average particle diameter of the resin particles (S-2) is 2.4 μm, the coefficient of variation is 3.9%, and the refractive index is 1.60.

<Synthesis Example 3>
In a four-necked flask equipped with a synthetic condenser tube of resin particles (S-3), a thermometer, and a dripping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, a solution in which 0.92 g of styrene, 0.10 g of ethylene glycol dimethacrylate, and 0.05 g of benzoyl peroxide were added to a solution in which 0.1 part of sodium lauryl sulfate was dissolved in 50 g of ion-exchanged water as an emulsifier, was added to the monomer using a homogenizer. The emulsion was adjusted, and the resulting monomer emulsion was added to the emulsion of the polymer seed particles, and further stirred. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-3). It was. The average particle diameter of the resin particles (S-3) is 3.0 μm, the coefficient of variation is 3.8%, and the refractive index is 1.60.

<Synthesis Example 4>
In a four-necked flask equipped with a synthetic cooling tube, a thermometer, and a dripping port for polymer seed particles (K-2), 90 g of ion-exchanged water, 10 g of styrene, 0.5 g of n-decyl mercaptan, and 0.1 g of NaCl are added. Nitrogen was passed for 1 hour to replace the nitrogen in the reactor. Thereafter, the temperature of the reaction solution was raised to 70 ° C., and then 0.03 g of potassium persulfate dissolved in a small amount of ion-exchanged water was poured into the reaction system using a syringe. Thereafter, the reaction was carried out at 70 ° C. for 24 hours. After completion of the reaction, the obtained emulsion was subjected to solid-liquid separation, and the obtained cake was washed with ion-exchanged water and then with methanol. When the particle diameter of the obtained polymer seed particles (K-2) was measured with a Coulter Multisizer (manufactured by Beckman Coulter, Inc.), the average particle diameter was 0.3 μm and the coefficient of variation was 3.8%.

In a four-necked flask equipped with a synthetic condenser tube, a thermometer, and a dripping port for resin particles (S-4), 0.5 g of polymer seed particles (K-2), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, a solution in which 0.1 part of sodium lauryl sulfate as an emulsifier was dissolved in 50 g of ion-exchanged water was added with a solution in which 7.70 g of styrene, 0.86 g of ethylene glycol dimethacrylate and 0.43 g of benzoyl peroxide were added, and the monomer was added using a homogenizer. The emulsion was adjusted, and the resulting monomer emulsion was added to the emulsion of the polymer seed particles, and further stirred. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After the radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-4). It was. The average particle diameter of the resin particles (S-4) is 0.8 μm, the variation coefficient is 4.3%, and the refractive index is 1.60.

<Synthesis Example 5>
Into a four-necked flask equipped with a synthetic condenser tube of resin particles (S-5), a thermometer, and a dropping port, 526 parts of ion-exchanged water, 1.6 parts of 25% aqueous ammonia, and 118 parts of methanol are stirred. To this solution, 30 parts of 3-methacryloxypropyltrimethoxysilane was added from the dropping port, and 3-methacryloxypropyltrimethoxysilane was hydrolyzed and condensed to prepare organopolysiloxane particles. Two hours after the start of the reaction, an emulsion of the obtained organopolysiloxane particles was sampled, and the particle size was measured with a Coulter Multisizer (manufactured by Beckman Coulter, Inc.). The average particle size was 1.95 μm. . Next, 90 parts of styrene and divinyl were dissolved in a solution prepared by dissolving 2.5 parts of polyoxyethylene styrenated phenyl ether sulfate ammonium salt (Daiichi Kogyo Seiyaku Co., Ltd., Hightenol NF-08) as an emulsifier with 175 parts of ion-exchanged water. TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) was added with a solution obtained by dissolving 10 parts of benzene, 2,2'-azobis (2,4-dimethylvaleronitrile) (Wako Pure Chemical Industries, Ltd., V-65). Then, the monomer emulsion was prepared by emulsifying and dispersing at 6000 rpm for 5 minutes, and the obtained monomer emulsion was added to the emulsion of organopolysiloxane particles and further stirred. Two hours after the addition of the monomer emulsion, the reaction solution was sampled and observed with a microscope. As a result, it was confirmed that the organopolysiloxane particles absorbed the monomer and became enlarged. Next, the temperature of the reaction solution was raised to 65 ° C. under a nitrogen atmosphere and held at 65 ° C. for 2 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further dried under vacuum at 80 ° C. for 12 hours to obtain resin particles (S-15). It was. The obtained resin particles (S-15) had a particle size of 3.5 μm, a coefficient of variation of 3.9%, and a refractive index of 1.60.

<Synthesis Example 6>
Synthesis of resin particles (S-6) In a four-necked flask equipped with a cooling tube, a thermometer, and a dropping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, and 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 0.10 g of styrene, 0.16 g of methyl methacrylate, 0.02 g of ethylene glycol dimethacrylate, and 0.01 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further dried under vacuum at 80 ° C. for 12 hours to obtain resin particles (S-6). It was. The average particle diameter of the resin particles (S-6) is 1.2 μm, the coefficient of variation is 4.9%, and the refractive index is 1.57.

<Synthesis Example 7>
Synthesis of resin particles (S-7) In a four-necked flask equipped with a cooling tube, a thermometer, and a dropping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 2.16 g of styrene, 0.93 g of methyl methacrylate, 0.34 g of ethylene glycol dimethacrylate, and 0.17 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-7). It was. The average particle diameter of the resin particles (S-7) is 3.0 μm, the coefficient of variation is 4.1%, and the refractive index is 1.57.

<Synthesis Example 8>
Synthesis of resin particles (S-8) In a four-necked flask equipped with a cooling tube, a thermometer, and a dropping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 0.55 g of styrene, 0.37 g of methyl methacrylate, 0.10 g of ethylene glycol dimethacrylate, and 0.05 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-8). It was. The average particle diameter of the resin particles (S-8) is 2.0 μm, the coefficient of variation is 4.5%, and the refractive index is 1.57.

<Synthesis Example 9>
Synthesis of Resin Particle (S-9) In a four-necked flask equipped with a cooling tube, a thermometer, and a dropping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 0.05 g of styrene, 0.20 g of methyl methacrylate, 0.03 g of ethylene glycol dimethacrylate, and 0.01 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the obtained cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-9). It was. The average particle diameter of the resin particles (S-9) is 1.3 μm, the variation coefficient is 4.7%, and the refractive index is 1.55.

<Synthesis Example 10>
Synthesis of Resin Particle (S-10) In a four-necked flask equipped with a cooling tube, a thermometer, and a dripping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, and 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, a solution in which 0.4 part of methyl methacrylate, 0.04 g of ethylene glycol dimethacrylate, and 0.02 g of benzoyl peroxide were added to a solution in which 0.1 part of sodium lauryl sulfate was dissolved in 50 g of ion-exchanged water as an emulsifier was added by a homogenizer. A monomer emulsion was prepared, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-10). It was. The average particle diameter of the resin particles (S-10) is 1.5 μm, the coefficient of variation is 4.1%, and the refractive index is 1.51.

<Synthesis Example 11>
Synthesis of Resin Particle (S-11) In a four-necked flask equipped with a cooling tube, a thermometer, and a dripping port, 0.5 g of polymer seed particle (K-1), 50 g of ion-exchanged water, 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, 0.64 g of styrene, 13.66 g of methyl methacrylate, 1.59 g of ethylene glycol dimethacrylate, and 0.80 g of benzoyl peroxide were dissolved in a solution obtained by dissolving 0.1 part of sodium lauryl sulfate as an emulsifier with 50 g of ion-exchanged water. The solution was added, the monomer emulsion was adjusted with a homogenizer, and the obtained monomer emulsion was added to the emulsion of the polymer seed particles, followed by further stirring. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum-dried at 80 ° C. for 12 hours to obtain resin particles (S-11). It was. The average particle diameter of the resin particles (S-11) is 5.0 μm, the coefficient of variation is 4.3%, and the refractive index is 1.51.

<Synthesis Example 12>
Synthesis of Resin Particles (S-12) In a four-necked flask equipped with a cooling tube, a thermometer, and a dropping port, 0.5 g of polymer seed particles (K-1), 50 g of ion-exchanged water, and 0.05 g of sodium lauryl sulfate. Was added to uniformly disperse, and 20 g of a 3% by weight aqueous solution of polyvinyl alcohol was added to obtain a polymer seed particle dispersion. Next, a solution in which 39 parts of styrene 39.27 g, ethylene glycol dimethacrylate 4.36 g, and benzoyl peroxide 2.18 g were dissolved in a solution in which 0.1 part of sodium lauryl sulfate was dissolved in 50 g of ion-exchanged water as an emulsifier was added. The emulsion was adjusted, and the resulting monomer emulsion was added to the emulsion of the polymer seed particles, and further stirred. Next, the reaction solution was heated to 70 ° C. in a nitrogen atmosphere and held at 70 ° C. for 24 hours to perform radical polymerization of the monomer. After radical polymerization, the obtained emulsion was subjected to solid-liquid separation, and the resulting cake was washed with ion-exchanged water and then with methanol, and further vacuum dried at 80 ° C. for 12 hours to obtain resin particles (S-13). It was. The average particle diameter of the resin particles (S-12) is 7.0 μm, the coefficient of variation is 4.6%, and the refractive index is 1.60.

<Synthesis Example 14>
Synthesis of agglomerated silica particles (G-1) A glass reactor having an internal volume of 10 liters equipped with a stirrer was mixed with 1600 cc of methanol, 200 cc of aqueous ammonia (25% by weight), 8 cc of 5N NaOH aqueous solution, and actinol F-3 as a surfactant. 2 g (Matsumoto Yushi Seiyaku Co., Ltd.) was charged and mixed well. Moreover, the raw material liquid which melt | dissolved the tetraethyl silicate (made by Colcoat Chemical Co., Ltd.) in the ratio of 208g with respect to 1 liter of methanol was prepared. Next, while keeping the temperature of the reaction medium at 20 ° C., the raw material liquid was dropped at a rate of 1.0 g / min, and after adding a total of 640 g of tetraethyl silicate raw material liquid, the reaction was stopped, The silica particles were allowed to settle and the supernatant liquid was separated. Further, redispersion-decantation treatment was performed in methanol, and methanol was removed by an evaporator to obtain cohesive silica particles (G-1). The obtained silica particles (G-1) had a particle size of 1.0 μm, a coefficient of variation of 2.1%, and a refractive index of 1.50.

<< Preparation of coating composition >>
<Preparation Example 1>
100 g of DPHA (manufactured by Nippon Kayaku Co., Ltd.) which is an ultraviolet curable resin, 5 g of Irgacure 184 (manufactured by Ciba Ciba Specialty Chemicals) which is a photopolymerization initiator, 20 g of resin particles (S-1), toluene Was sufficiently mixed with 187.5 g to prepare a coating solution. This coating solution was filtered through a polypropylene filter having a pore size of 30 μm to prepare a coating composition (C-1).

<Preparation Example 2>
A coating composition (C-2) was obtained in the same manner as the coating composition (C-1) except that the amount of each component was changed to the amount shown in Table 1.

<Preparation Example 3>
A coating composition (C-3) was obtained in the same manner as the coating composition (C-1) except that the amount of each component was changed to the amount shown in Table 1.

<Preparation Example 4>
A coating composition (C-4) was obtained in the same manner as the coating composition (C-1) except that the amount of each component was changed to the amount shown in Table 1.

<Preparation Example 5>
The coating composition was the same as the coating composition (C-1) except that the resin particles (S-2) were used instead of the resin particles (S-1), and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-5) was obtained.

<Preparation Example 6>
Coating composition, except that resin particles (S-3) are used in place of resin particles (S-1), cohesive silica particles (G-1) are added, and the amounts of each component are the amounts shown in Table 1. The coating composition (C-6) was obtained in the same manner as the product (C-1).

<Preparation Example 7>
The coating composition was the same as in the coating composition (C-1) except that the resin particles (S-4) were used instead of the resin particles (S-1), and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-7) was obtained.

<Preparation Example 8>
The coating composition was the same as that of the coating composition (C-1) except that the resin particles (S-5) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-8) was obtained.

<Preparation Example 9>
The coating composition was the same as that of the coating composition (C-1) except that the resin particles (S-6) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-9) was obtained.

<Preparation Example 10>
The coating composition was the same as in the coating composition (C-1) except that the resin particles (S-7) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-10) was obtained.

<Preparation Example 11>
The coating composition was the same as that of the coating composition (C-1) except that the resin particles (S-8) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-11) was obtained.

<Preparation Example 12>
The coating composition was the same as the coating composition (C-1) except that the resin particles (S-9) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 1. A product (C-12) was obtained.

<Preparation Example 13>
A coating composition (C-13) was obtained in the same manner as the coating composition (C-1) except that the resin particles were not used and the amounts of each component were changed to the amounts shown in Table 2.

<Preparation Example 14>
The coating composition was the same as the coating composition (C-1) except that the cohesive silica particles (G-1) were added without using the resin particles, and the amounts of the respective components were changed to the amounts shown in Table 2. (C-14) was obtained.

<Preparation Example 15>
The coating composition was the same as the coating composition (C-1) except that the cohesive silica particles (G-1) were added without using the resin particles, and the amounts of the respective components were changed to the amounts shown in Table 2. (C-15) was obtained.

<Preparation Example 16>
The coating composition was the same as the coating composition (C-1) except that the cohesive silica particles (G-1) were added without using the resin particles, and the amounts of the respective components were changed to the amounts shown in Table 2. (C-16) was obtained.

<Preparation Example 17>
The coating composition was the same as in the coating composition (C-1) except that the resin particles (S-10) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 2. A product (C-17) was obtained.

<Preparation Example 18>
The coating composition was the same as that of the coating composition (C-1) except that the resin particles (S-11) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 2. A product (C-18) was obtained.

<Preparation Example 19>
Antimony-doped tin oxide particles (secondary particle size 0.5 μm, manufactured by Ishihara Sangyo Co., Ltd., SN-100P) were used in place of the resin particles (S-1), and the amounts of each component were changed to the amounts shown in Table 2. In the same manner as in the coating composition (C-1), a coating composition (C-19) was obtained.

<Preparation Example 20>
The coating composition was the same as the coating composition (C-1) except that the resin particles (S-12) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 2. A product (C-20) was obtained.

<Preparation Example 21>
The coating composition was the same as the coating composition (C-1) except that the resin particles (S-12) were used instead of the resin particles (S-1) and the amounts of the respective components were changed to the amounts shown in Table 2. A product (C-21) was obtained.

<Preparation Example 22>
A coating composition (C-22) was obtained in the same manner as the coating composition (C-1) except that the amount of each component was changed to the amount shown in Table 2.

≪Preparation of lactone ring-containing resin film≫
Next, production examples of the lactone ring-containing resin film will be described.

  First, an evaluation method of a lactone ring-containing resin (hereinafter sometimes referred to as “lactone ring-containing polymer”) will be described.

<Polymerization reaction rate, polymer composition analysis>
For the reaction rate during the polymerization reaction and the content of the specific monomer unit in the polymer, the amount of unreacted monomer in the obtained polymerization reaction mixture was measured using a gas chromatograph (GC17A, manufactured by Shimadzu Corporation). It was obtained by measuring using.

<Dynamic TG>
The polymer (or polymer solution or pellet) is once dissolved or diluted in tetrahydrofuran, poured into excess hexane or methanol for reprecipitation, and the taken out precipitate is vacuum dried (1 mmHg (1.33 hPa), 80 ° C. Volatile components and the like were removed by conducting the reaction for 3 hours or more, and the obtained white solid resin was analyzed by the following method (dynamic TG method).
Measuring apparatus: differential type differential thermal balance (Thermo Plus2 TG-8120 Dynamic TG, manufactured by Rigaku Corporation)
Measurement conditions: Sample amount 5 to 10 mg
Temperature increase rate: 10 ° C / min
Atmosphere: Nitrogen flow 100 mL / min
Method: Step-like isothermal control method (controlled to a mass reduction rate of 0.005% / sec or less in the range from 60 ° C to 500 ° C)
<Containing ratio of lactone ring structure>
First, based on the amount of mass reduction that occurs when all hydroxyl groups are dealcoholated as methanol from the obtained polymer composition, 300 before the start of decomposition of the polymer from 150 ° C. before the mass reduction starts in dynamic TG measurement. The dealcoholization reaction rate was determined from the mass reduction due to the dealcoholization reaction up to ° C.

That is, in the dynamic TG measurement of the polymer having a lactone ring structure, the mass reduction rate between 150 ° C. and 300 ° C. is measured, and the obtained actual measurement value is defined as the actual mass reduction rate (X). On the other hand, from the composition of the polymer, the mass loss rate when assuming that all the hydroxyl groups contained in the polymer composition become alcohols and dealcoholized because they are involved in the formation of lactone rings (that is, 100% on the composition) The mass reduction rate calculated assuming that the dealcoholization reaction has occurred is defined as the theoretical mass reduction rate (Y). The theoretical mass reduction rate (Y) is more specifically the molar ratio of raw material monomers having a structure (hydroxyl group) involved in the dealcoholization reaction in the polymer, that is, the raw material single amount in the polymer composition. It can be calculated from the body content. These values are calculated for the dealcoholization:
1- (actual mass reduction rate (X) / theoretical mass reduction rate (Y))
Substituting for, the value is obtained and expressed in percentage (%), the dealcoholization reaction rate is obtained.

  As an example, the content ratio of the lactone ring structure is calculated in the pellet obtained in Production Example 1 described later. When the theoretical mass reduction rate (Y) of this polymer is obtained, the molecular weight of methanol is 32, the molecular weight of methyl 2- (hydroxymethyl) acrylate is 116, and 2- (hydroxymethyl) in the polymer is ) Since the content (mass ratio) of methyl acrylate is 20.0 mass% in terms of composition, (32/116) × 20.0≈5.52 mass%. On the other hand, the actual mass reduction rate (X) by dynamic TG measurement was 0.34% by mass. When these values are applied to the above-described dealcoholization calculation formula, 1− (0.34 / 5.52) ≈0.938 is obtained, and the dealcoholization reaction rate is 93.8%.

  And the content (mass ratio) in the said copolymer composition of the raw material monomer which has the structure (hydroxyl group) concerned in lactone cyclization as what the predetermined lactone cyclization was performed by this dealcoholization reaction rate The content rate of the lactone ring structure in the copolymer can be calculated by multiplying the reaction rate by the dealcoholization reaction rate and converting it to the content rate (mass ratio) of the lactone ring structure. In the case of the production example described later, 2- (hydroxymethyl) methyl acrylate has a content of 20.0% by mass in the copolymer, a calculated dealcoholization reaction rate of 93.8%, and a molecular weight of 116- ( Since the formula amount of the lactone ring structure produced when hydroxymethyl) methyl acrylate is condensed with methyl methacrylate is 170, the content of the lactone ring structure in the copolymer is 27.5 (20.0 × 0.938 × 170/116) mass%.

<Weight average molecular weight, number average molecular weight>
The weight average molecular weight and number average molecular weight of the polymer were determined in terms of polystyrene using a gel permeation chromatograph (GPC system, manufactured by Tosoh Corporation).

<Thermal analysis of polymer>
The thermal analysis of the polymer was performed using a differential scanning calorimeter (DSC-8230, manufactured by Rigaku Corporation) under the conditions of about 10 mg of sample, a heating rate of 10 ° C./min, and a nitrogen flow of 50 mL / min. In addition, the glass transition temperature (Tg) was calculated | required by the midpoint method based on ASTM-D-3418.

<Production example 1>
(Production Example of Lactone Ring-Containing Resin Film (F-1))
First, in a reaction vessel having a capacity of 30 L equipped with a stirrer, a temperature sensor, a cooling pipe, and a nitrogen gas introduction pipe, 8 kg of methyl methacrylate, 2 kg of methyl 2- (hydroxymethyl) acrylate, 10 kg of methyl isobutyl ketone, n-dodecyl mercaptan 5 g was charged.

  While introducing nitrogen gas into the reaction vessel, the temperature was raised to 105 ° C. and refluxed. As a polymerization initiator, 5 g of t-butyl peroxyisopropyl carbonate (Kaya-Carbon BIC-75, manufactured by Kayaku Akzo Co., Ltd.) was added. At the same time as the addition, a solution prepared by dissolving 10 g of t-butylperoxyisopropyl carbonate (Kaya-Carbon BIC-75, manufactured by Kayaku Akzo Co., Ltd.) in 230 g of methyl isobutyl ketone was added dropwise over a period of 2 hours. Solution polymerization was performed at 120 ° C., and further aging was performed for 4 hours.

  To the obtained polymer solution, 30 g of stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added and cyclized at about 90 to 120 ° C. for 5 hours under reflux. A condensation reaction was performed. Subsequently, the obtained polymer solution was a vent type screw twin screw extruder having a barrel temperature of 260 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), a rear vent number of 1, and a forevent number of 4. (Φ = 29.75 mm, L / D = 30), introduced at a processing rate of 2.0 kg / h in terms of resin amount, and further subjected to cyclization condensation reaction and devolatilization in this extruder and extruded. A transparent pellet of the lactone ring-containing polymer was obtained.

  The obtained lactone ring-containing polymer was measured for dynamic TG, and a mass loss of 0.34% by mass was detected. The lactone ring-containing polymer had a weight average molecular weight of 144,000 and a glass transition temperature of 131 ° C.

  The lactone ring-containing polymer pellets were melt-extruded from a coat hanger type T die having a width of 150 mm using a twin-screw extruder having a 20 mmφ screw to obtain a lactone ring-containing resin film (F-1) having a thickness of about 100 μm. ) Was prepared.

<Production example 2>
(Production Example of Lactone Ring-Containing Resin Film (F-2) Provided with UV Absorption Capability)
1. In a 30 L reaction kettle equipped with a stirrer, temperature sensor, cooling pipe and nitrogen introduction pipe, 41.5 parts of methyl methacrylate (MMA), 6 parts of methyl 2- (hydroxymethyl) acrylate (MHMA), 5 parts 2- [2′-hydroxy-5′-methacryloyloxy] ethylphenyl] -2H-benzotriazole (Otsuka Chemical Co., Ltd., trade name: RUVA-93), 50 parts toluene, 0.025 part Adeka Stub 2112 (manufactured by Asahi Denka Kogyo Co., Ltd.), 0.025 part of n-dodecyl mercaptan was charged, and the temperature was raised to 105 ° C. while refluxing nitrogen. At the same time as t-amyl peroxy isononanoate (manufactured by Atofina Yoshitomi Corp., trade name: lupazole 570) was added, 0.10 parts of t-amyl peroxy Dropwise over 3 hours Sononanoeto perform solution polymerization under reflux (about devices 105 through 110 ° C.), the mixture was aged over an additional 4 hours.

  To the obtained polymer solution, 0.05 part of 2-ethylhexyl phosphate (manufactured by Sakai Chemical Industry Co., Ltd., trade name: Phoslex A-8) was added and refluxed (about 90 to 110 ° C.) for 2 hours. A cyclization condensation reaction was performed. Subsequently, a heat treatment was carried out at 240 ° C. for 30 minutes by an autoclave to complete the cyclization condensation reaction.

  Subsequently, the polymer solution obtained by the cyclization condensation reaction was prepared by adding a barrel temperature of 240 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), a rear vent number of 1, and a forevent number of 4 (upstream). From the side, referred to as the first, second, third and fourth vents) vent type screw twin screw extruder (φ = 29.75 mm, L / D = 30) It was introduced at a treatment rate and devolatilized. At that time, separately prepared antioxidant / deactivator mixed solution was injected at a charging rate of 0.03 kg / hour using a high-pressure pump after the first vent. Moreover, it inject | poured with the injection | throwing-in speed | rate of 0.05 kg / hour of the ultraviolet absorber solution prepared separately after the 2nd vent. Further, after the third vent, ion exchange water was injected at a charging rate of 0.01 kg / hour using a high pressure pump. The antioxidant / deactivator mixed solution is 50 parts of Sumilizer GS (manufactured by Sumitomo Chemical Co., Ltd.) and 35 parts of zinc octylate (3.6% Nikka octix zinc manufactured by Nippon Chemical Industry Co., Ltd.) in 200 parts of toluene. It is dissolved. The UV absorber solution is made by CGL777MPA (Ciba Specialty Chemicals Co., Ltd.) which has a hydroxyphenyl triazine skeleton with a UV absorber having a molecular weight of 954 as a main component (a mixture of UV absorbers having molecular weights of 771, 954 and 1138). Ingredient 80%) 19 parts dissolved in 31 parts toluene.

  By the devolatilization operation, a transparent thermoplastic resin composition pellet having a UV-absorbing monomer unit was obtained. The weight average molecular weight in terms of standard polystyrene of the resin part by GPC was 145000, and the glass transition temperature was 122 ° C.

Using the above resin, extrusion was performed under the following conditions using a single screw extruder having a cylinder diameter of 20 mm at an extrusion temperature of 270 ° C. to obtain a lactone ring-containing resin film (F-2) having a thickness of 100 μm. (T-die: temperature 270 ° C., width 120 mm, film formation: two rolls with gloss, roll temperature 110 ° C., take-off speed: 2.5 m / min).
≪Evaluation of anti-glare film≫
[Example 1]
The prepared coating composition (C-1) was applied to the lactone ring-containing resin film (F-1) using a bar coater so that the dry film thickness was 6 μm, and the coating layer was dried at 100 ° C. for 2 minutes. Thereafter, a shaping film (X-45, manufactured by Toray Industries, Inc.) was laminated on the coated surface, irradiated with 250 mJ / cm ² of ultraviolet light with a high-pressure mercury lamp, and then the shaping film was peeled off to form an antiglare layer. About the obtained anti-glare film, ten-point average roughness (Rz), maximum luminance variation, scintillation, haze, transmission sharpness, weather resistance, solvent resistance, pencil hardness and film charging potential were evaluated. The results are shown in Table 3.
[Example 2]
Except for using the coating composition (C-2) instead of the coating composition (C-1) and using the lactone ring-containing resin film (F-2) as the base film, the same procedure as in Example 1 was performed. A coating film was obtained. The results are shown in Table 3.
Example 3
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-3) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 4
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-4) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 5
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-5) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 6
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-6) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 7
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-7) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 8
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-8) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 9
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-9) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 10
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-10) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 11
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-11) was used instead of the coating composition (C-1). The results are shown in Table 3.
Example 12
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-12) was used instead of the coating composition (C-1). The results are shown in Table 3.
[Comparative Example 1]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-13) was used instead of the coating composition (C-1). The results are shown in Table 3.
[Comparative Example 2]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-14) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 3]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-15) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 4]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-16) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 5]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-17) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 6]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-18) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 7]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-19) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 8]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-20) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 9]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-21) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 10]
A coating film was obtained in the same manner as in Example 1 except that the coating composition (C-22) was used instead of the coating composition (C-1). The results are shown in Table 4.
[Comparative Example 11]
A coating film was obtained in the same manner as in Example 1 except that a triacetyl cellulose film (TD-80U, manufactured by Fuji Film Co., Ltd.) was used instead of the lactone ring-containing resin film (F-1). The results are shown in Table 4.
[Comparative Example 12]
A coating film was obtained in the same manner as in Example 1 except that a cycloolefin polymer film (Zeonor ZF14, manufactured by Nippon Zeon Co., Ltd.) was used instead of the lactone ring-containing resin film (F-1). The results are shown in Table 4.
[Comparative Example 13]
A coating film was obtained in the same manner as in Example 1 except that a PET film (HBPF8W, manufactured by Teijin DuPont) was used instead of the lactone ring-containing resin film (F-1). The results are shown in Table 4.

  The anti-glare film of the present invention has excellent diffusion and anti-glare properties even when used in high-definition displays, and improves transmission clarity. Even if the haze value is increased to reduce scintillation (glare of the surface), the transmission clarity is maintained high. Furthermore, since weather resistance, surface hardness, workability and safety during film production and processing are all higher than conventional ones and can fully exhibit characteristics according to various optical applications, for example, liquid crystal display devices and It is suitable for optical applications that impart antiglare and light diffusibility to flat panel displays such as plasma displays and organic EL display devices.

Claims (5)

An anti-glare film comprising an anti-glare layer formed on a transparent substrate film, wherein the transparent substrate film has a lactone ring structure represented by the following general formula (1) It is a lactone ring-containing resin film, the outermost surface of the antiglare layer has an uneven shape, the antiglare layer contains at least one kind of fine particles in a binder, and the fine particles have a particle size of 0.5 to 5 μm, the difference in refractive index from the binder is 0.02 to 0.2, and 3 to less than 30 parts by weight with respect to 100 parts by weight of the binder. Anti-glare film characterized.

[Wherein, R ¹ , R ² and R ³ independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms; the organic residue may contain an oxygen atom] 2. The antiglare layer according to claim 1, wherein the antiglare layer has a haze of 10% or more and less than 40%, a transmission definition of 50 or more, and a luminance variation observed from the front of transmitted light is less than 0.3V. Anti-glare film. 3. The anti-glare film according to claim 1, wherein the anti-glare layer contains 5 parts by weight or less of cohesive silica fine particles. 4. The antiglare film according to claim 1, wherein the binder is an ionizing radiation curable resin. A flat translucent display, a light source device that irradiates the translucent display from the back, and the antiglare film according to any one of claims 1 to 4 laminated on a surface of the translucent display. A transmissive display device.