JP3348969B2 - Fluoropolymer composition for coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluoropolymer composition for coating.

[0002]

2. Description of the Related Art Fluororesins are excellent in chemical resistance, low dielectric properties, low surface energy, non-adhesion, weather resistance, and chemical heat resistance (high thermal decomposition temperature). It is used for various applications that cannot be used. However, fluororesins tend to lack adhesion to a substrate because they have non-adhesiveness, and in order to improve this,
Roughening of a base material and etching of a fluororesin with a naphthalene solution of metallic sodium have been performed.

[0003] In Japanese Patent Application Laid-Open No.
_{It is known that 2} = CFO (CF ₂ ) _n CF = CF ₂ undergoes cyclopolymerization and has a cyclic structure to give a solvent-soluble polymer having a low refractive index and a low dielectric constant. There is also a need to improve the adhesion of such coatable amorphous perfluoropolymers.

[0004] Japanese Patent Application Laid-Open No. 195957/1991 discloses a fluorine-containing polymer composition for coating containing a polymer having a fluorine-containing aliphatic ring structure and a silane coupling agent as essential components. Although a fluorine-containing polymer composition having improved adhesion is obtained in the present invention, a solution obtained by dissolving a trialkoxy-type silane coupling agent and a fluorine-containing polymer in an aprotic fluorinated solvent is obtained over time. However, there were problems such as an increase in viscosity and difficulty in filtration.

[0005]

It is an object of the present invention to overcome the aforementioned disadvantages of the prior art.

[0006]

The present invention firstly provides a polymer having a fluorinated aliphatic ring structure, a trialkoxysilane as a silane coupling agent, an aprotic fluorinated solvent , and a Contains fluorine as a fluorine solvent
Secondly, the present invention provides a fluorine-containing polymer composition for coating containing nitrogen alcohol as an essential component, and an article having a coating film obtained from the fluorine-containing polymer composition for coating.

The fluorinated polymer having a fluorinated aliphatic ring structure used in the present invention is a polymer soluble in a solvent, and a preferred example thereof is a fluorinated polymer having a main chain soluble in a fluorinated solvent. An amorphous perfluoropolymer having an aliphatic ring structure is exemplified. The fluorine-containing polymer is preferably amorphous, but may be used if the crystallinity is 30% or less, preferably 20% or less.

As a specific example of the amorphous perfluoropolymer, CF ₂ ＣＦCFO (CF ₂ ) _n CF = CF ₂ (n = 1 to 1)
3) Cyclopolymer, perfluoro (2,2-dimethyl-)
Homopolymers of (1,3-dioxol) and perfluoro (1,3-dioxol) are exemplified. Copolymers using two or more of these monomers are also suitable.

Copolymers of these monomers with monomers such as tetrafluoroethylene can be used if the crystallinity is within the above-mentioned range. Even if the main chain does not have a fluorinated aliphatic ring structure, it can be used as long as the crystallinity is small as described above.

[0010]

The molecular weight of the polymer used varies depending on the polymer composition and application, but basically, the polymer is soluble in a solvent and the viscosity of the solution is 10 ⁶ cP or less, preferably 10 ⁵ cP or less.
There is no upper limit of the molecular weight if it is at most P, more preferably at most 10 ⁴ cP.

For use as a coating material, the number average or weight average molecular weight is about 10 ³ to 10
⁷ , particularly preferably 10 ^{4 to} 5 × 10 ⁶ . If the molecular weight is too small, the polymer may become brittle or physical properties such as excellent heat resistance of the fluoropolymer may be impaired. It is not always easy to obtain or synthesize a polymer soluble in a solvent and having a molecular weight of more than 10 ⁶ .

The average molecular weight can be directly determined by a light scattering method, an osmotic pressure method, a method based on melt viscoelasticity, or the like. In addition, if a calibration curve is prepared using data obtained by those methods in advance, gel permeation chromatography or intrinsic viscosity [η] can be measured to calculate the molecular weight. It can also be determined by analyzing the terminal groups by infrared absorption spectrum or nuclear magnetic resonance spectrum.

In the case of an amorphous perfluoropolymer having a fluorinated aliphatic ring structure in the main chain, perfluoro (2-
Butyltetrahydrofuran) at 30 ° C. has an intrinsic viscosity [η] of 0.02 to 5 dl / g, particularly 0.05 to
1 dl / g of polymer is preferred. In addition, these polymers have a carboxyl group at the terminal or side chain of the main chain as a reaction site with a silane coupling agent, a carboxylic acid fluoride,
Those having an ester group or the like are preferred.

As the aprotic fluorinated solvent for dissolving the above fluorinated polymer, the following fluorinated compounds can be exemplified.

Polyfluoroaromatic compounds such as perfluorobenzene, pentafluorobenzene, 1,3-bis (trifluoromethyl) benzene, 1,4-bis (trifluoromethyl) benzene, perfluorotributylamine, perfluorotripropylamine, etc. A polyfluorotrialkylamine compound, perfluorodecalin,
Perfluorocyclohexane, perfluoro (1,3,
Polyfluorocycloalkane compounds such as 5-trimethylcyclohexane), polyfluorocyclic ether compounds such as perfluoro (2-butyltetrahydrofuran), and fluorine-containing low-molecular-weight polyethers.

Perfluorohexane, perfluorooctane, perfluorodecane, perfluorododecane, perfluoro (2,7-dimethyloctane), 1,1,2
-Trichloro-1,2,2-trifluoroethane, 1,
1,1-trichloro-2,2,2-trifluoroethane, 1,3-dichloro-1,1,2,2,3-pentafluoropropane, 1,1,1,3-tetrachloro-2,
2,3,3-tetrafluoropropane, 1,1,3,4
-Tetrachloro-1,2,2,3,4,4-hexafluorobutane, perfluoro (1,2-dimethylhexane), perfluoro (1,3-dimethylhexane),
H, 3H-perfluoropentane, 1H-perfluorohexane, 1H-perfluorooctane, 1H-perfluorodecane, 1H, 1H, 1H, 2H, 2H-perfluorohexane, 1H, 1H, 1H, 2H, 2H-perfluorooctane, 1H, 1H, 1H, 2H, 2H-perfluorodecane, 3H, 4H-perfluoro-2-methylpentane, 2H, 3H-perfluoro-2-methylpentane, 1H-1,1-dichloroperfluoropropane, 1H-1,3-dichloro Polyfluoroalkane compounds such as perfluoropropane;

These aprotic fluorinated solvents can be used alone or as a mixture, and a wide variety of other compounds can be used.

Examples of the silane coupling agent, a wide range, including those known or well-known conventionally, can be exemplified as follows.

Monoalkoxysilanes such as trimethylmethoxysilane, trimethylethoxysilane, dimethylvinylmethoxysilane and dimethylvinylethoxysilane.

Γ-chloropropylmethyldimethoxysilane, γ-chloropropylmethyldiethoxysilane, γ-
Aminopropylmethyldiethoxysilane, γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, N
-(Β-aminoethyl) -γ-aminopropylmethyldiethoxysilane, γ-glycidyloxypropylmethyldimethoxysilane, γ-glycidyloxypropylmethyldiethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, methyldimethoxysilane,
Methyldiethoxysilane, dimethyldimethoxysilane,
Dimethyldiethoxysilane, methylvinyldimethoxysilane, methylvinyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, 3,3
3-trifluoropropylmethyldimethoxysilane,
3,3,4,4,5,5,6,6,7,7,8,8,8
-Tridecafluorooctylmethyldimethoxysilane,
3,3,4,4,5,5,6,6,7,7,8,8,
Dialkoxysilanes such as 9,9,10,10,10-heptadecafluorodecylmethyldimethoxysilane;

Γ-aminopropyltrimethoxysilane,
γ-aminopropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane,
Phenyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,4,4,5
5,6,6,7,7,8,8,8-tridecafluorooctyltrimethoxysilane, 3,3,4,4,5,5
6,6,7,7,8,8,9,9,10,10,10-
Tri- or tetraalkoxysilanes such as heptadecafluorodecyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane and the like.

Aromatic amine silane coupling agent which is a silane coupling agent having an aromatic amine structure (When this silane coupling agent is used, gelation and thickening hardly occur even with a trialkoxy compound. The use of this silane coupling agent makes it possible to obtain a structure having no alkyl group or alkylene structure having 2 or more carbon atoms after the condensation reaction of alkoxysilane, thereby improving heat resistance. Can be.).

A preferred aromatic amine silane coupling agent has the general formula ArSi (OR ¹ ) (OR ² ) (O
R ³ ), ArSiR ⁴ (OR ¹ ) (OR ² ) or ArSi
R ⁴ R ⁵ (OR ¹ ) [wherein R ^{1 to} R ⁵ each independently represent a hydrogen atom, an alkyl group or an aryl group having 1 to 20 carbon atoms, and Ar represents p-, m-, or o-aminophenyl Represents a group. ] It is a compound represented by these. Specific examples are described below.

Aminophenyltrimethoxysilane, aminophenyltriethoxysilane, aminophenyltripropoxysilane, aminophenyltriisopropoxysilane, aminophenylmethyldimethoxysilane, aminophenylmethyldiethoxysilane, aminophenylmethyldipropoxysilane, aminophenyl Methyldiisopropoxysilane, aminophenylphenyldimethoxysilane, aminophenylphenyldiethoxysilane, aminophenylphenyldipropoxysilane, aminophenylphenyldiisopropoxysilane and the like.

The hydrogen atom of the amino group may be substituted with an alkyl group or an aryl group. For example, N, N-dimethylaminophenyl trialkoxysilane, N, N-dimethylaminophenylmethyldialkoxysilane and the like can be mentioned. Other than this, for example, US Pat.
For example, an aromatic amine silane coupling agent described in the specification of Japanese Patent No. 1,815 can be used.

[0027] These silane coupling agents can be alone or in combination Rukoto. Among them, a silane coupling agent having an amino group (γ-aminopropyltriethoxysilane, as one that improves the adhesiveness of the fluoropolymer without impairing the transparency of the fluoropolymer,
γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ
-Aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ-aminopropyltriethoxysilane, N- (β-aminoethyl)- γ-aminopropylmethyldiethoxysilane, aminophenyltrimethoxysilane, aminophenyltriethoxysilane, aminophenylmethyldimethoxysilane, aminophenylmethyldiethoxysilane, etc.) or a silane coupling agent having an epoxy group (γ-glycidyloxy Propyltrimethoxysilane, γ-glycidyloxypropylmethyldimethoxysilane, γ-glycidyloxypropyltriethoxysilane, γ-glycidyloxypropylmethyldiethoxysilane, etc.) are exemplified as particularly preferable ones.

For fluorinated polymers having a carboxyl group introduced into the main chain terminal or side chain, alkoxysilanes having an amino group or an epoxy group are particularly effective. For a fluorine-containing polymer having an ester group introduced, an alkoxysilane having an amino group or an aminophenyl group is particularly effective.

In an aprotic fluorinated solvent, a trialkoxysilane having an amino group or an epoxy group causes the viscosity of the liquid composition of the present invention to increase with time as compared with a dialkoxysilane having a similar group. It is easy to gel. Trialkoxysilanes also have lower solubility of the fluoropolymer in aprotic fluorinated solvent solutions than dialkoxysilanes. Therefore, when using trialkoxysilanes, it is preferable to add a protic fluorinated solvent, particularly a fluorinated alcohol.

In the case of dialkoxysilanes, the solubility is not as low as trialkoxysilanes, but the solubility can be similarly increased by adding a protic fluorinated solvent, particularly a fluorinated alcohol. If dialkoxy silanes, since temporal increase in the viscosity of the liquid-like composition is not as pronounced as trialkoxysilanes, the protic fluorine-containing solvent such as a fluorinated alcohol may not necessarily added, but Addition can surely suppress the increase in viscosity.

As described above, when a protic fluorinated solvent is added to the fluorinated polymer solution, the solubility of the silane coupling agent in the fluorinated polymer solution can be increased.
Further, it is possible to suppress an increase in viscosity and a gelation which are considered to be caused by a reaction between the silane coupling agents.

Examples of the flop protic fluorinated solvent are exemplified as follows.

Trifluoroethanol, 2,2,3
3,3-pentafluoro-1-propanol, 2- (perfluorobutyl) ethanol, 2- (perfluorohexyl) ethanol, 2- (perfluorooctyl) ethanol, 2- (perfluorodecyl) ethanol, 2
-(Perfluoro-3-methylbutyl) ethanol, 1
H, 1H, 3H-tetrafluoro-1-propanol,
1H, 1H, 5H-octafluoro-1-pentanol, 1H, 1H, 7H-dodecafluoro-1-heptanol, 1H, 1H, 9H-hexadecafluoro-1-nonanol, 2H-hexafluoro-2-propanol,
Fluorinated alcohols such as 1H, 1H, 3H-hexafluoro-2-butanol.

Trifluoroacetic acid, perfluoropropanoic acid, perfluorobutanoic acid, perfluoropentanoic acid,
Perfluorohexanoic acid, perfluoroheptanoic acid, perfluorooctanoic acid, perfluorononanoic acid, perfluorodecanoic acid, 3H-tetrafluoropropanoic acid, 5
Fluorinated carboxylic acids such as H-octafluoropentanoic acid, 7H-dodecafluoroheptanoic acid and 9H-hexadecafluorononanoic acid; amides of these fluorinated carboxylic acids, such as trifluoromethanesulfonic acid and heptadecafluorooctanesulfonic acid; Fluorine sulfonic acid and the like.

[0035] These protic fluorinated solvents may be alone or a mixture of two or more thereof.

The concentration of the fluorinated polymer in the mixture of the aprotic fluorinated solvent and the protic fluorinated solvent is usually 0.1 to 30% by weight, preferably 0.5 to 20% by weight. The amount of the silane coupling agent is 0.01 to 50 parts by weight, preferably 0.1 to 30 parts by weight, per 100 parts by weight of the fluoropolymer. The amount of the protic fluorinated solvent in the mixture of the aprotic fluorinated solvent and the protic fluorinated solvent is 0.01 to 50% by weight, preferably 0.1 to 30% by weight.

Since the fluoropolymer composition of the present invention has good adhesion, it can be used for various applications, and can be applied to the following applications.

Protective coats in the optical and electrical fields, such as optical fibers, lenses, solar cells, optical disks, touch panels, hybrid ICs, liquid crystal cells, printed boards, photosensitive drums, film capacitors, glass windows, and various films. Medical / physical / chemical equipment such as syringes, pipettes, thermometers, beakers, petri dishes, measuring cylinders, etc., as well as solder masks, solder resists, rubber and plastic protection, weather resistance, and antifouling coatings. Protective coat for fiber and fabric. Antifouling coat of sealant. IC, LSI and other integrated circuits and transistors and other semiconductor component sealing films, semiconductor component buffer coating films, semiconductor component passivation films, multi-module and interlayer insulating films for semiconductor components in integrated circuits, rust preventive paints, resin adhesion inhibitors, Ink adhesion inhibitor,
Multilayer wiring board interlayer insulation film, etc.

In particular, the present invention can be advantageously applied to window materials, lenses, antireflection films of liquid crystal, CRT, or plasma displays, and optical fibers. TVs, monitors, video cameras, and personal computers using various types of displays can provide clear images by applying an antireflection film formed by coating the present composition.

[0040]

EXAMPLES "Polymer solution A" Poly (perfluoro (butenyl vinyl ether))
([Η]: 0.24, terminal-COOH type) 2 parts by weight of 9
It was dissolved in 8 parts by weight of perfluoro (2-butyltetrahydrofuran) to obtain a solution having a polymer concentration of 2% by weight.

"Polymer solution B" Poly (perfluoro (butenyl vinyl ether))
([Η]: 0.24, terminal-COOCH ₃ type) 2 parts by weight was dissolved in 98 parts by weight of perfluoro (2-butyltetrahydrofuran) to obtain a solution having a polymer concentration of 2% by weight.

"Polymer solution C" Poly (perfluoro (butenyl vinyl ether))
([Η]: 0.24, terminal-COOH type) 9 parts by weight of 9
1 part by weight of perfluorotributylamine / 3,3,3
In 4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol (weight ratio 95/5), a solution having a polymer concentration of 9% by weight was dissolved. Obtained.

Reference Example 1 To 200 g of the polymer solution A, 10.3 g of 2,2,3,3,3-pentafluoro-1-propanol and 0.19 g of γ-aminopropylmethyldiethoxysilane were added and mixed. A colorless and transparent solution having a viscosity of 2.7 cP (25 ° C.) was obtained. This polymer solution was used to form 0.1% on a glass substrate.
When a coating of 1 μm was applied, the reflectance was 0.9.
%Met. A tape peeling test was performed by a cross-cut tape method of JIS K5400. All the squares remained in perfect form even after the tenth peel test of the cellophane tape. The polymer solution was kept at 55 ° C. for 4 days, and the viscosity was measured again at 25 ° C., but there was no change in the viscosity.

Comparative Example 1 200 g of the polymer solution A was added with 0.23 g of γ-aminopropyltriethoxysilane, and the viscosity was 5.7 cP.
(25 ° C.). 55 ° C.
, And the viscosity was measured again at 25 ° C., and the viscosity increased to 8.0 cP (25 ° C.).

Reference Example 2 A coating test was performed in the same manner as in Reference Example 1 except that the amount of γ-aminopropylmethyldiethoxysilane was changed to 0.075 g. The same result was obtained in a cross cut tape peel test.

Reference Example 3 To 300 g of the polymer solution A, 15.5 g of 2,2,3,3,3-pentafluoro-1-propanol and 0.075 g of γ-glycidyloxypropylmethyldiethoxysilane were added and mixed. However, it is colorless and transparent and has a viscosity of 3.3 cP (25
C). The same results as in Reference Example 1 were obtained in a cross cut tape peel test. After keeping this solution at 55 ° C. for 2 days, the viscosity was measured again, but there was no change.

Reference Example 4 The same test as in Reference Example 3 was performed except that the amount of γ-glycidyloxypropylmethyldiethoxysilane was changed to 0.375 g. The liquid obtained by mixing was colorless and transparent, and had a viscosity of 3.3 cP (25 ° C.). In the crosscut tape peel test, the same result as that of Reference Example 1 was obtained. 55 of this solution
After holding at 2 ° C. for 2 days, the viscosity was measured again, but there was no change.

Reference Example 5 10.5 g of 2,2,3,3,3-pentafluoro-1-propanol and 0.15 g of γ-aminopropylmethyldiethoxysilane were added to 200 g of the polymer solution B and mixed. A clear and colorless solution was obtained. When a 0.1 μm coating was performed on a glass substrate using the polymer solution, the reflectance was 0.9%. As in Reference Example 1, all the squares remained in a perfect shape even after the tenth peel test of the cellophane tape.

Reference Example 6 When 0.2 g of γ-aminopropylmethyldiethoxysilane was added to 230 g of the polymer solution C, a colorless and transparent liquid was obtained. The solution viscosity was 400 cP (25 ° C.). After one day at 55 ° C., the viscosity increased slightly and 675 c
A solution D of P (25 ° C.) was obtained. However, when 0.6 g of γ-aminopropylmethyldiethoxysilane was added to the same amount of polymer solution C, the viscosity of the transparent solution obtained was 2
It was a solution E having no viscosity increase even after holding at 55 ° C. for 1 day at 90 cP.

The solutions D and E were spin-coated on a silicon wafer and dried at 250 ° C. A cross cut tape test was performed on the obtained coating films, and no abnormality was observed in any of the cells. Similarly, solutions D and E were spin-coated on a silicon wafer, dried at 250 ° C., cross-cut, and heat-treated at 300 ° C. for 1 hour. Microscopic observation showed no evidence of melting of the resin. Solutions D and E were cast and dried at 200 ° C. The resulting cast film did not dissolve in the solvent of the polymer solution C and maintained its shape.

Reference Example 7 0.05 g of γ-glycidyloxypropylmethyldiethoxysilane and 3,3,4,4,
0.09 g of 5,5,6,6,7,7,8,8,8-tridecafluorooctylmethyldimethoxysilane was added. The viscosity of the obtained solution was 3.6 cP (25 ° C.). Using this solution, a coating test was performed in the same manner as in Reference Example 1 to obtain a transparent and uniform coating film. A cross-cut tape test was performed on the obtained coating film, and it showed good adhesion. This solution was kept at 55 ° C. for 3 days, but there was no change in viscosity.

Example 1 Aminophenyltrimethoxysilane (p-form 65% by weight, m-form 32% by weight, o-form 3% by weight) / 3,3,3
Mixture of 4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol (weight ratio 3.8
/96.2) A solution of 16.32 parts by weight of poly (perfluoro (butenyl vinyl ether)) ([η]: 0.24, terminal —COOH type) in perfluorotributylamine (polymer concentration: 9.5% by weight) 200 It dissolved in parts by weight.
The solution was left at room temperature for one month at a solution viscosity of 286 cP, but there was no change with time in the viscosity.

The solution was spin-coated on a silicon wafer and dried at 200 ° C. to obtain a coating having a thickness of about 2 μm. A tape peeling test was performed by a cross-cut tape method of JIS K5400. All the squares remained in perfect form even after the tenth peel test of the cellophane tape.

Similarly, the solution was spin-coated on a silicon wafer and dried at 180 ° C. to form a coating film having a thickness of about 2 μm. Three similar samples were prepared and heat-treated at 250 ° C., 300 ° C., and 350 ° C. for 1 hour. J
Make a grid-like scratch according to IS K5400 and again at the same temperature (250 ° C, 300 ° C, 350 ° C respectively)
For 1 hour, no change was observed in the cross-sectional shape.

A hole having a diameter of 2 μm was formed by etching on the coating film which had been heat-treated at 300 ° C. for 1 hour, and again heat-treated at 300 ° C. for 1 hour, but no change was observed in the shape of the hole. Poly (perfluoro (butenyl vinyl ether))
A solution of [[η]: 0.24, terminal-COOH type] perfluorotributylamine (concentration: 9% by weight) was spin-coated on a silicon wafer, and the same test was performed. Fusion was observed between the two. The hole having a diameter of 2 μm produced by etching was crushed by the reheat treatment.

Example 2 Cast films were prepared from the solution E of Reference Example 6 and the solution of Example 1 , respectively, and heat-treated at 300 ° C. for 1 hour under nitrogen. The decomposition start temperature was measured in a nitrogen atmosphere.
1 ° C., 378 ° C. After the cast film obtained from the solution of Example 1 was heat-treated at 350 ° C. for 1 hour under nitrogen, the same measurement was carried out. As a result, the decomposition starting temperature was 392 ° C.

[0057]

The coating film obtained by coating the composition of the present invention undergoes a crosslinking reaction due to heat treatment,
Even at the above high temperatures, the shape can be maintained without melting and flowing,
It is particularly useful for applications exposed to high temperatures, such as electronics applications. Also, since the solution contains a silane coupling agent, good adhesion can be obtained without applying a primer.

In an electronic component, when it is used for an interlayer insulating film or a passivation film, the transmission speed can be increased and noise can be reduced since the dielectric constant is small. Since the fluoropolymer used in the present invention has low water absorption and has a crosslinked structure as described above, it has high adhesion to the base material, so that the reliability of the electronic component can be improved. Communication devices using electronic components, televisions, video cameras, video players, mobile phones, computers, and the like have improved performance in terms of reliability, signal processing speed, and the like.

Further, since the light transmittance is good, it is also suitable to be used as a window or a protective layer of a portion requiring light transmittance such as an optical disk or a light emitting element. An optical fiber coated with the composition of the present invention as a clad material has a large numerical aperture because the clad material has a small refractive index. Further, since the adhesive strength is high, the optical fiber can be used even in a high-temperature and high-humidity environment, and has good bending resistance.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-195757 (JP, A) JP-A-3-37251 (JP, A) JP-A-3-21647 (JP, A) JP-A-62-1987 27469 (JP, A) JP-A-2-129254 (JP, A) JP-A-2-123771 (JP, A) JP-A-63-260932 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) C09D 127/00-127/24 C09D 129/10 C08L 27/00-27/24

Claims (2)

(57) [Claims] 1. A polymer having a fluorinated aliphatic ring structure, a trialkoxysilane as a silane coupling agent,
Aprotic fluorinated solvent, and coating the fluorine-containing polymer composition according to the fluorinated alcohol as essential components as protic fluorinated solvent. 2. An article having a coating film obtained from the fluoropolymer composition for coating according to claim 1 .