JPH11302402A - Light-shielding film - Google Patents

Abstract

(57) [Abstract] (Modified) [Problem] A light-shielding film having excellent light-shielding properties, gas barrier properties, moisture-proof properties, and flexibility, and particularly suitable for photosensitive material packaging, pharmaceutical packaging, and food packaging with a high oil content. I will provide a. A liquid crystal polymer exhibiting optical anisotropy at the time of melting and carbon black as a light-shielding agent are 0.3 to 3%.
A light-shielding film containing 5 wt%. 2) A light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin having light-shielding properties.
3) 0.3 to 35 watts of a layer made of a liquid crystal polymer exhibiting optical anisotropy when melted and carbon black as a light shielding agent.
A light-shielding film having a layer made of a thermoplastic resin containing t%. 4) a layer comprising a liquid crystal polymer exhibiting optical anisotropy when molten and a layer comprising a thermoplastic resin, and a light-shielding paint, pigment or printing ink is applied or coated on the layer comprising the thermoplastic resin. Light-shielding film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a liquid crystalline polymer which exhibits optical anisotropy when melted and has a light-shielding property, a gas barrier property and a moisture-proof property. The present invention relates to a light-shielding film suitable for packaging such as.

[0002]

2. Description of the Related Art A light-shielding property, a gas barrier property, a moisture-proof property, a heat-resistant property and a chemical-resistant property are used for a film for packaging a photosensitive material, a film for packaging a pharmaceutical product, or a food, especially a food packaging film containing a large amount of fats and oils. There are many required properties from the market such as properties, and various studies have been made to meet these requirements.

For example, Japanese Patent Application Laid-Open No. 52-18584 discloses a film for packaging a photosensitive material comprising a polyolefin layer containing a light-shielding material and a heat seal layer. JP-A-6-182924 describes a plastic film suitable for packaging potato chips and the like, a laminated film composed of a silicon oxide layer and a pigment. JP-A-6-218869 describes a PET film containing carbon black and having a thin film of an inorganic oxide. Also, Japanese Patent Application Laid-Open No. Hei 7-21
Japanese Patent No. 5327 discloses a light-shielding container obtained from a laminate of a thermoplastic resin layer having a gas barrier property and a thermoplastic resin layer containing a light-shielding component. JP-A-7-72593 describes a moisture-proof packaging film for a film with a lens. JP-A-8-286320 describes a packaging material comprising an ethylene-based light-shielding layer and a heat seal layer, and JP-A-9-15794 describes a polyethylene containing at least one or more light-shielding layers. And a film for packaging a photosensitive material mainly comprising

[0004] In any case, however, the above-mentioned various requirements from the market have not been sufficiently satisfied. For example, when polyolefin is used for a light-shielding film, the gas barrier properties, chemical resistance, etc. are not sufficient, and the contents may be deteriorated. Further, when vinylidene chloride or the like is used for a light-shielding film, it is said that a halogen-based gas is generated during incineration. In addition, when aluminum foil or a vapor-deposited film is used, problems such as insufficient bending resistance, ash residue during incineration after use, and reaction to metal detectors have been pointed out. Therefore, those improvements have been strongly desired by the market.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention, that is, an object of the present invention is to provide a light-shielding property, a gas barrier property, an excellent moisture-proof property, a flexibility, and especially for a photosensitive material packaging. Another object of the present invention is to provide a light-shielding film suitable for pharmaceutical packaging or food, especially food packaging containing a large amount of oil and fat.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to the following inventions. (1) A light-shielding film comprising a liquid-crystalline polymer exhibiting optical anisotropy when melted and a light-shielding agent. (2) A light-shielding film made of a liquid crystalline polymer having a light-shielding property and exhibiting optical anisotropy when melted. (3) A light-shielding film comprising a liquid-crystalline polymer containing a light-shielding agent and exhibiting optical anisotropy when melted. (4) A light-shielding film comprising a liquid crystalline polymer containing 0.3 to 35% by weight of carbon black and exhibiting optical anisotropy when melted. (5) A light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a light-shielding paint, pigment or printing ink. (6) A light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin having light-shielding properties. (7) A light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin containing a light-shielding agent. (8) A light-shielding film having a layer composed of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer composed of a thermoplastic resin containing 0.3 to 35% by weight of carbon black. (9) a layer comprising a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer comprising a thermoplastic resin, and a light-shielding paint, pigment or printing ink is applied on the layer comprising the thermoplastic resin; Light-shielding film coated. Hereinafter, the present invention will be described in more detail.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The liquid crystalline polymer which exhibits optical anisotropy upon melting used in the present invention is a resin which exhibits optical anisotropy upon melting, for example, a wholly aromatic or semi-aromatic polyester. And polyester imides and polyester amides, and resin compositions containing them. In the present invention, a liquid crystal polyester or a composition containing a liquid crystal polyester is preferably used as such a liquid crystalline polymer.
It is more preferable to use a liquid crystal polyester resin composition having a liquid crystal polyester as a continuous phase and (B) a copolymer having a functional group reactive with the liquid crystal polyester as a dispersed phase.

The liquid crystal polyester referred to here is a polyester called a thermotropic liquid crystal polymer.
Specifically, (1) a compound comprising a combination of an aromatic dicarboxylic acid, an aromatic diol and an aromatic hydroxycarboxylic acid. (2) Those comprising a combination of different aromatic hydroxycarboxylic acids. (3) Those comprising a combination of an aromatic dicarboxylic acid and a nucleus-substituted aromatic diol. (4) Those obtained by reacting an aromatic hydroxycarboxylic acid with a polyester such as polyethylene terephthalate. And the like, which forms an anisotropic melt at a temperature of 400 ° C. or lower. In addition, in place of these aromatic dicarboxylic acids, aromatic diols, and aromatic hydroxycarboxylic acids, ester-forming derivatives thereof may be used.

The repeating structural units of the liquid crystal polyester include the following repeating structural units derived from an aromatic dicarboxylic acid, the following repeating structural units derived from an aromatic diol,
Examples of the repeating structural unit derived from an aromatic hydroxycarboxylic acid include, but are not limited to, these.

A repeating structural unit derived from an aromatic dicarboxylic acid:

[0011]

A repeating structural unit derived from an aromatic diol:

[0013]

A repeating structural unit derived from an aromatic hydroxycarboxylic acid:

A liquid crystal polyester which is particularly preferable from the balance of heat resistance, mechanical properties and workability is And more preferably at least 30 mol% or more of such a repeating structural unit. Specifically, the combination of repeating structural units is preferably any one of the following (I) to (VI).

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

The production methods of the liquid crystal polyesters (I) to (VI) are described, for example, in JP-B-47-47870, JP-B-63-3888, JP-B-63-3891, and JP-B-56-18016. JP-A-2-515
No. 23, and the like. Of these, a combination of (I), (II) or (IV) is preferable, and a combination of (I) or (II) is more preferable.

In the field where high heat resistance is required in the present invention, the liquid crystal polyester of the component (A) contains 30 to 80 mol% of the following repeating unit (a ') and 0 to 100% of the repeating unit (b'). 10 mol%, repeating unit (c ') is 1
A liquid crystal polyester having 0 to 25 mol% and a repeating unit (d ') of 10 to 35 mol% is preferably used.

[0024] (In the formula, Ar is a divalent aromatic group.)

In the field where the light-shielding film of the present invention requires easy disposal such as incineration after use from the viewpoint of environmental problems, the light-shielding film is particularly preferred among the preferable combinations of the fields required so far. Liquid crystal polyesters comprising a combination of only carbon, hydrogen and oxygen are particularly preferably used.

The component (B) used in the liquid crystal polyester resin composition is a copolymer having a functional group reactive with the liquid crystal polyester. The functional group reactive with the liquid crystal polyester is not particularly limited as long as it has reactivity with the liquid crystal polyester, and specific examples include an oxazolyl group, an epoxy group, and an amino group. Preferably, it is an epoxy group. The epoxy group or the like may be present as a part of another functional group, and such an example includes a glycidyl group.

In the copolymer (B), the method for introducing such a functional group into the copolymer is not particularly limited, and it can be carried out by a known method. For example, at the stage of synthesizing the copolymer, it is possible to introduce the monomer having the functional group by copolymerization, or it is also possible to graft copolymerize the monomer having the functional group to the copolymer. It is.

As the monomer having a functional group reactive with the liquid crystal polyester, and particularly as the monomer containing a glycidyl group, unsaturated glycidyl carboxylate and / or unsaturated glycidyl ether are preferably used.

The unsaturated carboxylic acid glycidyl ester preferably has the general formula Wherein R is a hydrocarbon group having an ethylenically unsaturated bond and having 2 to 13 carbon atoms. The unsaturated glycidyl ether is preferably a compound represented by the general formula: (R is a hydrocarbon group having 2 to 18 carbon atoms which has an ethylenically unsaturated bond, X is -CH ₂ -O- or It is. ).

Specifically, examples of the unsaturated carboxylic acid glycidyl ester include glycidyl acrylate, glycidyl methacrylate, itaconic acid diglycidyl ester, butenetricarboxylic acid triglycidyl ester,
Glycidyl p-styrenecarboxylate and the like can be mentioned. As unsaturated glycidyl ethers,
For example, vinyl glycidyl ether, allyl glycidyl ether, 2-methylallyl glycidyl ether, methacryl glycidyl ether, styrene-p-glycidyl ether and the like are exemplified.

The copolymer (B) having a functional group reactive with the liquid crystal polyester preferably contains 0.1 to 30% by weight of an unsaturated carboxylic acid glycidyl ester unit and / or an unsaturated glycidyl ether unit. It is a copolymer containing.

The copolymer (B) having a functional group reactive with the liquid crystal polyester may be a thermoplastic resin or a rubber, or a mixture of a thermoplastic resin and a rubber. You may. The use of rubber is more excellent in moldability and flexibility, and is therefore preferable.

More preferably, the copolymer (B) having a functional group reactive with the liquid crystal polyester is
A copolymer having a heat of fusion of crystal of less than 6 J / g, preferably less than 3 J / g. The copolymer (B) preferably has a Mooney viscosity of 3 to 70, more preferably 3 to 30, and particularly preferably 4 to 25.
The Mooney viscosity here refers to a value measured using a large rotor at 100 ° C. according to JIS K6300.

The rubber referred to here is a polymer substance having rubber elasticity at room temperature according to a new edition of Polymer Dictionary (edited by the Society of Polymer Science, published in 1988, Asakura Shoten).
Specific examples thereof include natural rubber, butadiene polymer, butadiene-styrene copolymer (including random copolymer, block copolymer (including SEBS rubber or SBS rubber, etc.), and graft copolymer), or The hydrogenated product, isoprene polymer, chlorobutadiene polymer, butadiene-acrylonitrile copolymer, isobutylene polymer, isobutylene-butadiene copolymer rubber,
Isobutylene-isoprene copolymer, acrylate-ethylene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, ethylene-propylene-styrene copolymer rubber, styrene-isoprene copolymer Rubber, styrene-butylene copolymer, styrene-ethylene-propylene copolymer rubber, perfluoro rubber, fluoro rubber, chloroprene rubber, butyl rubber, silicone rubber, ethylene-propylene-non-conjugated diene copolymer rubber, thiol rubber, polysulfide Examples include rubber, polyurethane rubber, polyether rubber (for example, polypropylene oxide, etc.), epichlorohydrin rubber, polyester elastomer, polyamide elastomer, and the like. Among them, an acrylate-ethylene copolymer is preferably used, and a (meth) acrylate-ethylene copolymer rubber is more preferred.

These rubber-like substances can be produced by any production method (eg, emulsion polymerization method, solution polymerization method, etc.) and any catalyst (eg, peroxide, trialkylaluminum, lithium halide, nickel-based catalyst, etc.). It may be something.

In the present invention, the copolymer (B)
Is a rubber having a functional group reactive with the liquid crystal polyester in the rubber as described above. In such a rubber, a method for introducing a functional group reactive with the liquid crystal polyester into the rubber is not particularly limited, and can be performed by a known method. For example, it is possible to introduce the monomer having the functional group by copolymerization at the stage of synthesizing the rubber, or it is also possible to graft copolymerize the monomer having the functional group to the rubber.

As specific examples of the copolymer (B) having a functional group reactive with the liquid crystal polyester, rubbers having an epoxy group include (meth) acrylate-ethylene- (unsaturated glycidyl carboxylate and And / or unsaturated glycidyl ether) copolymer rubber.

Here, the (meth) acrylic acid ester is
An ester obtained from acrylic acid or methacrylic acid and an alcohol. Alcohols have 1 carbon atom
~ 8 alcohols are preferred. Specific examples of (meth) acrylates include methyl acrylate, methyl methacrylate, n-butyl acrylate, n-butyl methacrylate, tert-butyl acrylate, ter
Examples thereof include t-butyl methacrylate, 2-ethylhexyl acrylate, and 2-ethylhexyl methacrylate. As the (meth) acrylic acid ester, one kind thereof may be used alone, or two or more kinds may be used in combination.

Preferably, the content of (meth) acrylate units is more than 40% by weight and less than 97% by weight, more preferably 45 to 70% by weight, and the ethylene unit is 3% by weight to 5% by weight.
0% by weight, more preferably 10 to 49% by weight, 0.1 to 30% by weight of unsaturated carboxylic acid glycidyl ether unit and / or unsaturated glycidyl ether unit,
More preferably, it is 0.5 to 20% by weight. If the ratio is outside the above range, the thermal stability and mechanical properties of a molded article such as a film or sheet obtained from the composition may be insufficient, which is not preferable.

The copolymer rubber can be produced by a conventional method, for example, bulk polymerization, emulsion polymerization, solution polymerization or the like using a free radical initiator. Typical polymerization methods are described in JP-B-46-45085 and JP-B-6-45085.
No. 1-127709, pressure of 500 k in the presence of a polymerization initiator generating free radicals
g / cm ² or more and a temperature of 40 to 300 ° C.

Other rubbers that can be used in the copolymer (B) of the present invention include acrylic rubber having a functional group reactive with the liquid crystal polyester and vinyl aromatic having a functional group reactive with the liquid crystal polyester. Hydrocarbon compounds
A conjugated diene compound block copolymer rubber can also be exemplified.

The acrylic rubber mentioned here is preferably represented by the general formula (1) (In the formula, R ¹ represents an alkyl group having 1 to 18 carbon atoms or a cyanoalkyl group.), A general formula (2) (Wherein, R ² is an alkylene group having 1 to 12 carbon atoms, R ³
Represents an alkyl group having 1 to 12 carbon atoms. ) And general formula (3) (Wherein, R ⁴ is a hydrogen atom or a methyl group, R ^{5 is} an alkylene group having 3 to 30 carbon atoms, R ⁶ is an alkyl group having 1 to 20 carbon atoms or a derivative thereof, and n is an integer of 1 to 20) .)) At least one monomer selected from the compounds represented by formula (1).

Specific examples of the alkyl acrylate represented by the general formula (1) include, for example, methyl acrylate, ethyl acrylate, propyl acrylate,
Examples thereof include butyl acrylate, pentyl acrylate, hexyl acrylate, actyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, decyl acrylate, dodecyl acrylate, and cyanoethyl acrylate.

The alkoxyalkyl acrylate represented by the general formula (2) includes, for example, methoxyethyl acrylate, ethoxyethyl acrylate, butoxyethyl acrylate, ethoxypropyl acrylate and the like. One or more of these can be used as the main component of the acrylic rubber.

As a constituent component of the acrylic rubber, an unsaturated monomer copolymerizable with at least one monomer selected from the compounds represented by the above general formulas (1) to (3), if necessary. Can be used. Examples of such unsaturated monomers include styrene, α-methylstyrene,
Acrylonitrile, halogenated styrene, methacrylonitrile, acrylamide, methacrylamide, vinylnaphthalene, N-methylolacrylamide, vinyl acetate, vinyl chloride, vinylidene chloride, benzyl acrylate, methacrylic acid, itaconic acid, fumaric acid, maleic acid, and the like. .

The preferred constituent ratio of the acrylic rubber having a functional group reactive with the liquid crystal polyester is at least one monomer selected from the compounds represented by the above general formulas (1) to (3). 0 to 99.9% by weight, 0.1 to 30.0% by weight of unsaturated carboxylic acid glycidyl ester and / or unsaturated glycidyl ether, selected from the compounds represented by the above general formulas (1) to (3). Unsaturated monomer copolymerizable with at least one monomer 0.0
３30.0% by weight. When the constituent ratio of the acrylic rubber is within the above range, heat resistance and impact resistance of the composition,
The molding processability is good and preferable.

The method for producing the acrylic rubber is not particularly limited. For example, JP-A-59-113010, JP-A-62-64809, and JP-A-3-160008
Or a well-known polymerization method described in WO95 / 04764, for example, in the presence of a radical initiator, emulsion polymerization, suspension polymerization,
It can be produced by solution polymerization or bulk polymerization.

The vinyl aromatic hydrocarbon compound-conjugated diene compound block copolymer rubber having a functional group reactive with the liquid crystal polyester is preferably (a)
Epoxidation of a rubber obtained by epoxidizing a block copolymer consisting of a sequence mainly composed of a vinyl aromatic hydrocarbon compound and (b) a sequence mainly composed of a conjugated diene compound, or epoxidation of a hydrogenated product of the block copolymer This is the rubber obtained.

The vinyl aromatic hydrocarbon compound-conjugated diene compound block copolymer or a hydrogenated product thereof can be produced by a known method.
798 and JP-A-59-133203.

As the aromatic hydrocarbon compound, for example,
Styrene, vinyltoluene, divinylbenzene, α-methylstyrene, p-methylstyrene, vinylnaphthalene and the like can be mentioned, among which styrene is preferable.
Examples of the conjugated diene compound include butadiene, isoprene, pyrrylene, 1,3-pentadiene, 3-butyl-1,3-octadiene and the like, butadiene or isoprene is preferred.

The rubber used as the copolymer (B) is preferably (meth) acrylate-ethylene-
(Unsaturated carboxylic acid glycidyl ester and / or unsaturated glycidyl ether) copolymer rubber is used.

The rubber used as the copolymer (B) can be vulcanized as required and used as a vulcanized rubber. The above (meth) acrylic acid ester-ethylene-
Vulcanization of the (unsaturated carboxylic acid glycidyl ester and / or unsaturated glycidyl ether) copolymer rubber is achieved by using a polyfunctional organic acid, a polyfunctional amine compound, an imidazole compound, and the like. It is not limited.

As a specific example of the copolymer (B) having a functional group reactive with the liquid crystal polyester, the thermoplastic resin having an epoxy group includes (a) 50 to 99% by weight of ethylene units, (b) ) 0.1 to 30% by weight, preferably 0.5 to 20% by weight of unsaturated carboxylic acid glycidyl ester units and / or unsaturated glycidyl ether units.
% By weight, and (c) an epoxy group-containing ethylene copolymer having an ethylenically unsaturated ester compound unit of 0 to 50% by weight.

Examples of the ethylenically unsaturated ester compound (c) include vinyl carboxylate such as vinyl acetate, vinyl propionate, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Esters, α, β-unsaturated carboxylic acid alkyl esters, and the like. Particularly, vinyl acetate, methyl acrylate and ethyl acrylate are preferred.

Specific examples of the epoxy group-containing ethylene copolymer include, for example, a copolymer composed of ethylene units and glycidyl methacrylate units, a copolymer composed of ethylene units and glycidyl methacrylate units, and a methyl acrylate unit. Copolymers composed of glycidyl methacrylate units and ethyl acrylate units, and copolymers composed of ethylene units, glycidyl methacrylate units and vinyl acetate units are exemplified.

The epoxy group-containing ethylene copolymer has a melt index (hereinafter sometimes referred to as MFR. JI.
SK6760, 190 ° C, 2.16 kg load) is preferably 0.5 to 100 g / 10 min, more preferably 2 to 100 g / 10 min.
５０50 g / 10 min. The melt index may be outside this range, but the melt index is 100 g
If it exceeds / 10 minutes, it is not preferable in view of the mechanical properties of the composition, and if it is less than 0.5 g / 10 minutes, the compatibility with the liquid crystal polyester of the component (A) is inferior.

[0057] Also, the epoxy group-containing ethylene copolymer is preferably in the range stiffness modulus of 10~1300kg / cm ^2, further preferably from 20~1100kg / cm ^2. If the flexural rigidity is outside this range, the molding processability and mechanical properties of the composition may be insufficient, which is not preferable.

The epoxy group-containing ethylene copolymer is usually prepared by reacting an unsaturated epoxy compound and ethylene in the presence of a radical generator at 500 to 4000 atm and 100 to 300 ° C. in the presence or absence of a suitable solvent or chain transfer agent. It is produced by a high-pressure radical polymerization method in which copolymerization is carried out in the presence. It can also be produced by a method in which an unsaturated epoxy compound and a radical generator are mixed with polyethylene and melt-grafted and copolymerized in an extruder.

The above liquid crystal polyester resin composition is a resin composition containing the above liquid crystal polyester,
A resin composition comprising (A) a liquid crystal polyester as a continuous phase and (B) a copolymer having a functional group reactive with the liquid crystal polyester as a dispersed phase. If the liquid crystal polyester is not a continuous phase, the gas barrier properties, moisture resistance, heat resistance, chemical resistance, and the like of the film may be significantly reduced, which is not preferable.

The details of the mechanism of such a resin composition of a copolymer having a functional group and a liquid crystal polyester are unknown, but the resin composition between the component (A) and the component (B) of the composition is not clear. It is considered that a reaction occurs, and the component (A) forms a continuous phase and the component (B) is finely dispersed, so that the molding processability of the composition is improved.

The flow start temperature (FT1) of the liquid crystal polyester resin composition is preferably higher than [the flow start temperature (FT2) lower than the flow start temperature (FT2) of the liquid crystal polyester of the component (A) of the composition] by 10 ° C.). More preferably, FT1 is higher than FT2. FT1 (° C) is [FT2-1
0] (° C.) is preferable because the moldability of the composition is improved. The flow start temperature referred to here is a capillary rheometer (for example, Shimadzu's Koka type flow tester CFT-
Resin heated at a heating rate of 4 ° C./min using a 500 type) under an load of 100 kgf / cm ² and an inner diameter of 1 m
m, a temperature (° C.) at which the melt viscosity shows 48,000 poise when extruded from a nozzle having a length of 10 mm.

One embodiment of such a liquid crystal polyester resin composition comprises (A) 56.0 to 99.9 liquid crystal polyester.
44% by weight, preferably 65.0 to 99.9% by weight, more preferably 70 to 98% by weight, and (B) a copolymer having a functional group reactive with a liquid crystal polyester.
The resin composition contains 0 to 0.1% by weight, preferably 35.0 to 0.1% by weight, and more preferably 30 to 2% by weight. If the content of the component (A) is less than 56.0% by weight, the gas barrier properties and heat resistance of a molded article such as a film or sheet obtained from the composition may be undesirably reduced. On the other hand, if the content of the component (A) exceeds 99.9% by weight, the molding processability of the composition may be reduced, and the composition is expensive, which is not preferable.

As a method for producing such a liquid crystal polyester resin composition, a known method can be used. For example, there is a method in which each component is mixed in a solution state and the solvent is evaporated or precipitated in the solvent. From an industrial point of view, a method of kneading each component in a molten state is preferred. For the melt kneading, kneading apparatuses such as a single-screw or twin-screw extruder and various kneaders which are generally used can be used. In particular, a biaxial high kneader is preferred. During the melt kneading, the cylinder set temperature of the kneading apparatus is 200 to 36.
The temperature range is preferably 0 ° C, more preferably 230 to 35.
0 ° C.

At the time of kneading, the respective components may be previously mixed uniformly using a device such as a tumbler or a Henschel mixer, or if necessary, the mixing may be omitted, and the components may be separately supplied to the kneading device. Methods can also be used.

Such a liquid crystal polyester resin composition includes:
Release of antioxidant, heat stabilizer, light stabilizer, flame retardant, lubricant, rust inhibitor, crosslinking agent, foaming agent, fluorescent agent, surface smoothing agent, surface gloss improving agent, fluororesin, etc., as required Various additives such as an improving agent can be used in the manufacturing process or in a subsequent processing step within a range that does not significantly impair the object of the present invention.

The liquid crystal polyester resin composition can be easily formed into a film, and the method of forming the film is not particularly limited, and can be performed by a known method.

Examples of the method of forming a film of the composition include a T-die method of extruding and winding a molten resin from a T-die, and extruding a molten resin into a cylindrical shape from an extruder provided with an annular die, cooling and winding the film. A film or sheet can be obtained by a film forming method, or a film or sheet can be obtained by further uniaxially stretching a sheet obtained by an injection molding method or an extrusion method. In the case of injection molding, extrusion molding, or the like, a film or sheet can be obtained by dry blending and pelletizing the component pellets at the time of molding without going through a kneading step in advance.

In the T-die method, a uniaxially stretched film or a biaxially stretched film obtained by winding a molten resin extruded through a T die while stretching it in a winder direction (longitudinal direction) is preferably used.

The conditions for setting the extruder during the formation of the uniaxially stretched film can be appropriately set according to the composition of the composition.
The cylinder set temperature is preferably in the range of 200 to 360 ° C, more preferably in the range of 230 to 350 ° C. If the ratio is outside this range, thermal decomposition of the composition may occur or film formation may be difficult, which is not preferable.

The slit interval of the T-die is 0.2 to 2.0.
mm is preferable, and 0.2 to 1.2 mm is more preferable.
The draft ratio of the uniaxially stretched film is preferably in the range of 1.1 to 40, more preferably 10 to 40, and particularly preferably 15 to 35.

The draft ratio mentioned here is a value obtained by dividing the cross-sectional area of the T-die slit by the cross-sectional area of the film perpendicular to the longitudinal direction. If the draft ratio is less than 1.1, the film strength is insufficient, and if the draft ratio exceeds 45, the surface smoothness of the film may be insufficient, which is not preferable. The draft ratio can be set by controlling the setting conditions of the extruder, the winding speed, and the like.

For the biaxially stretched film, the same extruder setting conditions as those for forming the uniaxially stretched film, that is, the cylinder set temperature is preferably in the range of 200 to 360 ° C., more preferably 230 to 350 ° C. The composition is melt-extruded at a slit interval of preferably 0.2 to 1.2 mm, and the melt sheet extruded from the T-die is simultaneously stretched in the longitudinal direction and the direction perpendicular to the longitudinal direction (lateral direction). First, the melt sheet extruded from the T-die is stretched in the longitudinal direction, and then the stretched sheet is stretched in a transverse direction from the tenter at a high temperature of 100 to 300 ° C. in the same step. Can be

When obtaining a biaxially stretched film, the stretching ratio is preferably in the range of 1.2 to 20 times in the longitudinal direction and 1.2 to 20 times in the transverse direction. If the stretching ratio is out of the above range, the strength of the composition film may be insufficient, or it may be difficult to obtain a film having a uniform thickness, which is not preferable.

An inflation film obtained by forming a melt sheet extruded from a cylindrical die by inflation is also preferably used.

That is, the liquid crystal polyester resin composition obtained by the above method is supplied to a melt-kneading extruder equipped with a die having an annular slit, and is set at a cylinder set temperature of 20.
Melt kneading is performed at 0 to 360 ° C, preferably 230 to 350 ° C, and the molten resin is extruded upward or downward from the annular slit of the extruder. The interval between the annular slits is usually 0.1 to 5 mm, preferably 0.2 to 2 mm, and the diameter of the annular slit is usually 20 to 1000 mm, preferably 25 to 600 mm.

Draft is applied to the melt-extruded molten resin film in the longitudinal direction (MD), and air or an inert gas, for example, nitrogen gas, is blown from the inside of the cylindrical film so that a transverse direction perpendicular to the longitudinal direction is obtained. The film is expanded and stretched in (TD).

In inflation molding (film formation),
The preferred blow ratio is 1.5 to 10, and the preferred MD draw ratio is 1.5 to 40. If the setting conditions during the inflation film formation are outside the above range, it may be difficult to obtain a high-strength liquid crystal polyester resin composition film having a uniform thickness and no wrinkles, which is not preferable.

After the expanded film is air-cooled or water-cooled on its circumference, it is passed through a nip roll and taken off.

In the case of inflation film formation, conditions can be selected according to the composition of the liquid crystal polyester resin composition such that the cylindrical melt film expands to a uniform thickness and a smooth surface state.

The thickness of the film is preferably 3 to 1000
μm, and more preferably 3 to 500 μm.

The light-shielding film of the present invention is a light-shielding film comprising a liquid crystal polymer exhibiting optical anisotropy when melted and a light-shielding agent.

Preferable examples of such a light-shielding film include a light-shielding film comprising a liquid-crystalline polymer containing a light-shielding agent and exhibiting optical anisotropy upon melting, and a liquid-crystal exhibiting optical anisotropy upon melting. A light-shielding film having a layer made of a polymer and a layer made of a thermoplastic resin containing a light-shielding agent is exemplified.

Specific examples of the light-shielding agent used for the light-shielding film comprising a liquid-crystalline polymer exhibiting optical anisotropy when melted and containing the light-shielding agent include carbon black, flake, talc, clay, mica, and barium sulfate. , Titanium oxide, and powders of metals such as aluminum, stainless steel, and tin. Carbon black is particularly preferred as a light-shielding agent, and the amount used is 0.3 to 35.
wt%, more preferably 1.0%
３０30 wt%. If the addition amount is less than 0.3 wt%, the light-shielding properties of the film may be significantly reduced, and if it exceeds 35 wt%, the moldability and flexibility of the liquid crystalline polymer may be undesirably reduced.

Here, as a method of dispersing the light-shielding agent in the liquid crystalline polymer, a known method can be used.
For example, there is a method in which each component is mixed in a solution state and the solvent is evaporated or precipitated in the solvent. From an industrial point of view, a method of kneading each component in a molten state is preferred. For the melt kneading, kneading apparatuses such as a single-screw or twin-screw extruder and various kneaders which are generally used can be used. In particular, a biaxial high kneader is preferred.

For kneading, each component may be previously mixed uniformly with a light-shielding agent and liquid crystal polymer pellets or powder using a device such as a tumbler or Henschel mixer, or the mixing may be omitted if necessary. It is also possible to use a method of separately supplying a fixed amount to the kneading device.

Here, a thermoplastic resin (however, excluding a liquid crystalline polymer which exhibits optical anisotropy when melted) may be laminated on a light shielding film made of a liquid crystalline polymer containing a light shielding agent. At that time, an adhesive layer may be interposed between the respective layers.

The light-shielding film composed of a liquid-crystalline polymer containing a light-shielding agent is composed of a liquid-crystalline polymer containing a light-shielding agent,
Alternatively, a film obtained by mixing a light-shielding agent and a liquid crystal polymer with a Henschel mixer or the like by a melt extrusion method from a T-die or a cylindrical die can be obtained. The thickness of the film made of the liquid crystalline polymer is not particularly limited, but is preferably 3 to 2000 μm, and 3 to 50 μm.
0 μm is more preferred.

As the thermoplastic resin in the light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy at the time of melting and a layer made of a thermoplastic resin containing a light-shielding agent, thermoplastic resins are usually used. Excluding liquid crystalline polymers that exhibit optical anisotropy when melted), for example, polyethylene, polypropylene, polyolefins such as ethylene-α-olefin copolymers, polystyrenes, polycarbonates, polyesters such as polyethylene terephthalate and polybutylene terephthalate. , Polyacetal, polyamide, polyphenylene ether,
Examples thereof include polyether sulfone, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polyphenylene sulfide, and fluororesin. Among them, polyethylene, polypropylene, ethylene-α-olefin copolymer and polyethylene terephthalate are preferred. As the thermoplastic resin, one kind or a mixture of two or more kinds can be used. Further, as the thermoplastic resin, a thermoplastic resin modified by introducing a functional group into a molecular chain is also used. Among them, polyolefins are preferably used because of their excellent moldability. Among the polyolefins, polyethylene is more preferably used.

Specific examples of the light-shielding agent mentioned here include carbon black, flake, talc, clay, mica, barium sulfate, titanium oxide and the like, and powders of metals such as aluminum, stainless steel and tin. Carbon black is particularly preferably used as a light-shielding agent, and its use amount is preferably from 0.3 to 35% by weight, and more preferably from 1.0 to 30% by weight. If the amount is less than 0.3% by weight, the light-shielding properties of the film may be significantly reduced, and if it exceeds 35% by weight, the moldability and flexibility of the thermoplastic resin may be undesirably reduced.

Here, as a method of dispersing the light-shielding agent in the thermoplastic resin, a known method can be used. For example, there is a method in which each component is mixed in a solution state and the solvent is evaporated or precipitated in the solvent. From an industrial point of view, a method of kneading each component in a molten state is preferred. For the melt kneading, kneading apparatuses such as a single-screw or twin-screw extruder and various kneaders which are generally used can be used. In particular, a biaxial high kneader is preferred. At the time of kneading, each component may be uniformly mixed in advance with a device such as a tumbler or a Henschel mixer, or, if necessary, mixing may be omitted and a method of separately supplying each component to the kneading device may be used. be able to.

When the thermoplastic resin film is used as a layer made of a thermoplastic resin containing a light-shielding agent, the method for producing the film is not particularly limited, and it can be produced by a method well known in the art. That is, it can be produced by a T-die extrusion method, a biaxial stretching method, an inflation film forming method, or the like, similarly to the production of the film made of the above liquid crystal polyester resin composition, and the obtained thermoplastic resin film The desired laminated film can be obtained by laminating a liquid crystal polymer film with a thermocompression bonding or using an adhesive.

If necessary, a film in which the liquid crystal polymer layer and the thermoplastic resin layer are laminated by co-extrusion from a T-die or a cylindrical die can be obtained. Either the polymer or the thermoplastic resin can be melt-extruded from a T-die onto another film to obtain a film in which they are laminated.

The thickness of the layer made of the thermoplastic resin containing the light-shielding agent is not particularly limited, but is preferably in the range of 3 to 2000 μm, and more preferably in the range of 3 to 500 μm.

A light-shielding film having a layer composed of a liquid crystalline polymer exhibiting optical anisotropy upon melting and a layer composed of a thermoplastic resin containing a light-shielding agent may have three or more layers. If necessary, an adhesive such as a hot melt adhesive or a polyurethane adhesive may be used between the layers to improve the adhesive strength between the layers.

As such a laminate, a layer made of a liquid crystal polymer may be used as an outer layer, a layer made of a thermoplastic resin containing a light-shielding agent may be formed as an inner layer in contact with the contents, or a layer made of a liquid crystal polymer may be used. May be formed by sandwiching a layer made of a thermoplastic resin containing the light-shielding agent and a layer made of another thermoplastic resin on a sandwich. Further, it can also be used as a film in which four or more layers are laminated.

The surface of each layer constituting such a laminate can be subjected to a surface treatment as required. Examples of such surface treatment methods include corona discharge treatment, plasma treatment, flame treatment, ultraviolet treatment, infrared treatment, sputtering treatment, solvent treatment, and polishing treatment.

As the light-shielding film of the present invention, a light-shielding film made of a liquid crystal polymer having a light-shielding property and exhibiting optical anisotropy when melted can also be mentioned. Specific examples thereof include a light-shielding film made of a liquid crystalline polymer containing the above-mentioned light-shielding agent and exhibiting optical anisotropy when melted. Examples of the light-shielding film of the present invention include a light-shielding film having a layer made of a liquid crystal polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin having light-shielding properties. As a specific example,
A light-shielding film having a layer made of a liquid crystalline polymer exhibiting optical anisotropy upon melting and a layer made of a thermoplastic resin containing a light-shielding agent is mentioned.

Another preferred embodiment of the light-shielding film of the present invention is a light-shielding film having a layer made of a liquid crystal polymer exhibiting optical anisotropy when melted and a layer made of a light-shielding paint, pigment or printing ink. And, having a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin, and applying a light-shielding paint, pigment or printing ink on the layer made of the thermoplastic resin, or A light-shielding film formed by coating can be used.

Examples of the light-shielding paint or pigment mentioned here include titanium oxide, calcium carbonate, barium sulfate, yellow iron oxide, red iron oxide, navy blue, ultramarine, mica titanium powder, carbon black, graphite, acetylene black,
Cyanine black, aniline black and the like can be mentioned. These paints or pigments are dissolved or suspended in an organic solvent or water and dispersed, and after further adding a surfactant, a plasticizer, a resin, and the like, if necessary, the surface of a liquid crystal polymer layer, or It can be applied or coated on the surface of a layer composed of a liquid crystal polymer and a thermoplastic resin forming a laminate.

As the printing ink, a coloring agent such as a pigment or a dye is dispersed in a vehicle made of oils and fats or a resin, and a solvent, an auxiliary agent and the like are added thereto to obtain appropriate fluidity and physical properties. One that has been used.
Examples of the vehicle here include nitrocellulose, polyamide, acrylic resin, polyurethane, epoxy resin, melamine resin, and the like.
Examples include zinc white, iron black, chromium oxide, zinc sulfide, and the like. Examples of the dye include azo-based, anthraquinone-based, and perinone-based dyes, and carbon black and graphite are preferred. Examples of the solvent include solvents such as esters, alcohols, and ketones. Examples of the auxiliary include various compounds, driers, plasticizers, defoamers, and dispersants. By appropriately combining the components, a printing ink layer having a sufficient light-shielding property can be formed.

The layer composed of the liquid crystalline polymer mentioned here can be obtained by the same method as described above, and the laminate of the layer composed of the liquid crystalline polymer and the layer composed of the thermoplastic resin can be obtained in the same manner as described above. Can be obtained.

At this time, the surface of the resin layer to which the paint, pigment or printing ink is applied or coated may be
Surface treatment can be performed as described above.

The light-shielding degree of the light-shielding film of the present invention is determined by using a spectrophotometer and the transmittance of the film in the visible light region is usually 5% or less, preferably 2% or less.

[0104]

EXAMPLES The present invention will be described below with reference to examples, but these are merely examples, and the present invention is not limited to these examples.

(1) Liquid crystalline polyester (i) 8.3 kg (60 mol) of p-acetoxybenzoic acid, 2.49 kg (15 mol) of terephthalic acid, 0.83 kg (5 mol) of isophthalic acid and 4,4'-diene 5.45 kg (20.2 mol) of acetoxydiphenyl was charged into a polymerization tank having a comb-shaped stirring blade, and the temperature was increased while stirring under a nitrogen gas atmosphere to carry out polymerization at 330 ° C. for 1 hour. The acetic acid gas produced as a by-product during this period was polymerized under strong stirring while being liquefied and collected and removed by a cooling tube. Thereafter, the system was gradually cooled, and the polymer obtained at 200 ° C. was taken out of the system.
The obtained polymer was pulverized with a hammer mill manufactured by Hosokawa Micron Co., Ltd. to obtain particles of 2.5 mm or less. This is further heated at 280 ° C. in a rotary kiln under a nitrogen gas atmosphere.
For 3 hours, the flow start temperature becomes 324.
A wholly aromatic polyester comprising the following repeating structural units in the form of particles at a temperature of ° C was obtained. Here, the flow start temperature is determined by using a Koka type flow tester CFT-500 manufactured by Shimadzu Corporation.
Resin heated at a temperature rise rate of 4 ° C./min.
When extruded from a nozzle having an inner diameter of 1 mm and a length of 10 mm under gf / cm ² , this refers to a temperature at which the melt viscosity shows 48,000 poise. Hereinafter, the liquid crystal polyester is represented by A
Abbreviated as -1. This polymer showed optical anisotropy at 340 ° C. or more under pressure. The repeating structural units of the liquid crystal polyester A-1 are as follows.

[0106]

(2) Copolymer (i) MA / E / GMA = 59.0 / 3 according to the method described in Example 5 of JP-A-61-127709.
A copolymer rubber having a weight ratio of 8.7 / 2.3 and a Mooney viscosity of 15 was obtained. Hereinafter, the copolymer rubber may be abbreviated as B-1. Here, E represents ethylene, MA represents methyl acrylate, and GMA represents glycidyl methacrylate. The Mooney viscosity is a value measured using a large rotor at 100 ° C. according to JIS K6300.

(3) Method of measuring physical properties (i) Oxygen gas permeability: Measured at a temperature of 20 ° C. in accordance with JIS K7126 A method (differential pressure method). The unit is cc / m ² · 24 hr · 1 atm.

(Ii) Water vapor transmission rate: JIS Z0208
The measurement was performed under the conditions of a temperature of 40 ° C. and a relative humidity of 90% according to the (cup method). The unit is g / m ²・ 24hr ・ 1atm
It is. The oxygen gas permeability and the water vapor permeability were determined by converting the film thickness to 25 μm.

(Iii) Flexibility (bending resistance): A laminated material was cut out in the MD direction and TD direction of the liquid crystal polyester resin composition layer, and each of them was manufactured by Toyo Seiki Co., Ltd., a MIT bending tester Folding Endurance Te.
MIT-D type and JIS-p-811
5, a bending angle of 135 degrees, a bending surface radius of curvature of 1 mm, and a bending speed of 175 times / m based on 5.
A bending test was performed in, and the number of times of bending until the film or sheet was broken was determined.

(Iv) Visible light transmittance: 500 n using a U-3500 type self-recording spectrophotometer manufactured by Hitachi, Ltd.
The light transmittance (%) at m was determined.

(V) Film appearance: The film appearance was evaluated based on the following criteria. ：: Film thickness unevenness, wrinkles, etc. are hardly observed. X: Uneven thickness, wrinkles, etc. are observed in the film.

Example 1 Low-density polyethylene L-708S manufactured by Sumitomo Chemical Co., Ltd.
(MFR (190 ° C., 2.16 Kg load) = 10 g /
10min) 88wt%, HAF carbon 12wt%
Was mixed with a Henschel mixer and melt-kneaded at a cylinder set temperature of 288 ° C. using a twin screw extruder manufactured by Ikegai Co., Ltd., Model PCM-30. The obtained pellets were subjected to a die gap of 1 mm, a die set temperature of 290 ° C,
It was melt-extruded downward from a T die having a die width of 300 mm to obtain a black film having a thickness of 45 μm. The following film
It may be abbreviated as PE-1.

A-1 80% by weight, and B-1 20
Using a TEX-30 type twin screw extruder manufactured by Nippon Steel Corporation, the weight% was melt-kneaded at a cylinder set temperature of 350 ° C. and a screw rotation speed of 200 rpm to obtain a composition. The flow start temperature of the obtained composition was 325 ° C. The pellets of this composition are fed to a 60 mm diameter single screw extruder equipped with a cylindrical die, and are melt-extruded at a cylinder set temperature of 350 ° C. and a screw rotation speed of 90 rpm to obtain a die diameter of 50 m.
The molten resin is extruded upward from a cylindrical die having a m, a lip interval of 1.5 mm, and a die set temperature of 350 ° C., and dry air is pressed into the hollow portion of the cylindrical film to expand the cylindrical film at a blow ratio of 3.6. After cooling, the film was passed through a nip roll and wound at a winding speed of 27 m / min (MD stretching ratio: 7.7). The thickness of the obtained film is 3
It was 6 μm. Hereinafter, the liquid crystal polyester resin composition film may be abbreviated as g-1. Next, g-
1. Two-component reactive adhesive AD manufactured by Toyo Morton Co., Ltd.
-503 is applied and dried, and then PE-1 is applied on the application surface.
By thermocompression bonding of the film, a two-layer laminated film was obtained. The appearance of the laminated film was evaluated as ○, no delamination was observed, the visible light transmittance was 0.3%, the oxygen permeability was 0.2 cc / m ² · 24 hr · 1 atm, and the water vapor permeability was 0.1%. It was 3 g / m ² · 24 hr · 1 atm, and the bending test result did not break at 100,000 times.

[0115]

The light-shielding film obtained in the present invention has excellent light-shielding properties, gas barrier properties, moisture-proof properties, etc., is flexible, has excellent chemical resistance, and does not react to metal detectors. It is possible to adopt a configuration that does not generate ash even when incinerated, and it is also possible to adopt a configuration that does not generate halogen-based gas. , For pharmaceutical packaging,
Alternatively, it can be used in a wide range of fields of industry, such as food, especially food packaging containing a large amount of fats and oils.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65D 65/16 B65D 65/16 C08K 3/04 C08K 3/04 C08L 101/12 C08L 101/12

Claims (27)

[Claims] 1. A light-shielding film comprising a liquid-crystalline polymer exhibiting optical anisotropy when melted and a light-shielding agent. 2. A light-shielding film comprising a liquid-crystalline polymer having a light-shielding property and exhibiting optical anisotropy when melted. 3. A light-shielding film comprising a liquid-crystalline polymer containing a light-shielding agent and exhibiting optical anisotropy when melted. 4. A light-shielding film comprising a liquid crystalline polymer containing 0.3 to 35% by weight of carbon black and exhibiting optical anisotropy when melted. 5. A light-shielding film comprising a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a light-shielding paint, pigment or printing ink. 6. A light-shielding film comprising a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin having light-shielding properties. 7. A light-shielding film comprising a layer made of a liquid crystalline polymer exhibiting optical anisotropy when melted and a layer made of a thermoplastic resin containing a light-shielding agent. 8. A layer comprising a liquid crystalline polymer exhibiting optical anisotropy upon melting and carbon black of 0.3 to 35 watts.
A light-shielding film having a layer made of a thermoplastic resin containing t%. 9. The light-shielding film according to claim 6, wherein the thermoplastic resin is a polyolefin. 10. A layer comprising a liquid crystal polymer exhibiting optical anisotropy when melted and a layer comprising a thermoplastic resin,
A light-shielding film obtained by applying or coating a light-shielding paint, pigment or printing ink on a layer made of the thermoplastic resin. 11. A liquid crystalline polymer exhibiting optical anisotropy upon melting, wherein (A) a liquid crystalline polyester is a continuous phase and (B) a copolymer having a functional group reactive with the liquid crystalline polyester is a dispersed phase. The light-shielding film according to any one of claims 1 to 10, which is a liquid crystal polyester resin composition. 12. A liquid crystalline polymer which exhibits optical anisotropy when melted comprises (A) 56.0 to 99.9% by weight of a liquid crystal polyester and (B) a copolymer having a functional group reactive with the liquid crystal polyester. The light-shielding film according to any one of claims 1 to 10, which is a liquid crystal polyester resin composition obtained by melt-kneading 44.0 to 0.1% by weight of the combined liquid crystal polyester resin composition. 13. The light-shielding film according to claim 11, wherein the functional group reactive with the liquid crystal polyester is an epoxy group, an oxazolyl group or an amino group. 14. The copolymer (B) having a functional group reactive with the liquid crystal polyester, wherein the copolymer (B) contains 0.1 to 30% by weight of an unsaturated carboxylic acid glycidyl ester unit and / or an unsaturated glycidyl ether unit. The light-shielding film according to any one of claims 11 to 13, which is a polymer. 15. The copolymer (B) having a functional group reactive with the liquid crystal polyester has a heat of fusion of 3 J / crystal.
11. A copolymer having a weight of less than g.
15. The light-shielding film according to any of 14. 16. The copolymer (B) having a functional group reactive with a liquid crystal polyester has a Mooney viscosity of 3 to 70.
The light-shielding film according to any one of claims 11 to 15, wherein The Mooney viscosity as used herein refers to a value measured at 100 ° C. using a large rotor according to JIS K6300. 17. The light-shielding film according to claim 11, wherein the copolymer (B) having a functional group reactive with the liquid crystal polyester is a rubber having an epoxy group. . 18. The rubber having an epoxy group comprises (meth) acrylic ester-ethylene- (unsaturated carboxylic acid glycidyl ester and / or unsaturated glycidyl ether) copolymer rubber.
The light-shielding film according to the above. 19. The method according to claim 19, wherein the (meth) acrylate is methyl acrylate, methyl methacrylate, n-butyl acrylate, n-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate,
The light-shielding film according to claim 18, comprising at least one selected from -ethylhexyl acrylate and 2-ethylhexyl methacrylate. 20. The copolymer according to claim 11, wherein the copolymer (B) having a functional group reactive with the liquid crystal polyester is a thermoplastic resin having an epoxy group.
The light-shielding film according to the above. 21. The light-shielding film according to claim 11, wherein the liquid crystal polyester (A) contains at least 30 mol% of the following repeating structural units. 22. The liquid crystal polyester (A) according to claim 11, wherein the liquid crystal polyester (A) is obtained by reacting an aromatic dicarboxylic acid, an aromatic diol and an aromatic hydroxycarboxylic acid. The light-shielding film according to the above. 23. The light-shielding film according to claim 11, wherein the liquid crystal polyester (A) is obtained by reacting a combination of different aromatic hydroxycarboxylic acids. 24. The liquid crystal polyester resin composition according to claim 11, wherein the flow start temperature is higher than [the temperature lower than the flow start temperature of the liquid crystal polyester of the component (A) of the composition by 10 ° C.]. The light-shielding film according to any one of the above. Here flow temperature and, using a capillary rheometer, the heated resin at a heating rate of 4 ° C. / min, under a load 100 kgf / cm ^2, an inner diameter of 1 mm, length 1
When extruded from a 0 mm nozzle, the melt viscosity is 480.
A temperature (° C.) showing 00 poise. 25. The light-shielding film according to claim 1, wherein the light-shielding film is a film for packaging a photosensitive material. 26. The light-shielding film is a film for packaging a film with a lens.
The light-shielding film according to any one of the above. 27. The light-shielding film according to claim 1, wherein the light-shielding film is a pharmaceutical packaging film.