KR102428501B1 - Method of producing optical film, optical film, polarizing plate and image display device - Google Patents

Abstract

(Project) To provide the manufacturing method of the optical film by which generation|occurrence|production of the interference nonuniformity was suppressed and generation|occurrence|production of the wind nonuniformity and streaks on the hard-coat layer surface was suppressed. Moreover, providing the optical film manufactured by this manufacturing method, the polarizing plate containing an optical film, and an image display apparatus.
(Solution Means) On a cellulose acylate film substrate containing at least one compound selected from a sugar ester compound and a polycondensation ester compound, the following (a) to (d) are contained, and the following (1) - The manufacturing method of the optical film which apply|coats the composition for hard-coat layer formation which satisfy|fills the conditions of (3), and forms a hard-coat layer.
(a) polyfunctional (meth)acrylate compound, (b) methanol, (c) cellulose acylate soluble solvent, (d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent
(1): (b) Content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation. (2): (c) Content of the cellulose acylate soluble solvent is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation. (3): The solvent whose surface tension in 20 degreeC is less than 23 mN/m contains 10 mass % - 30 mass % in total with respect to the total mass of the solvent in the composition for hard-coat layer formation.

Description

Manufacturing method of optical film, optical film, polarizing plate, and image display apparatus {METHOD OF PRODUCING OPTICAL FILM, OPTICAL FILM, POLARIZING PLATE AND IMAGE DISPLAY DEVICE}

The present invention relates to a manufacturing method of an optical film, an optical film, a polarizing plate, and an image display device.

In image display devices such as cathode tube displays (CRT), plasma displays (PDP), electroluminescence displays (ELD), fluorescent display displays (VFD), field emission displays (FEDs), and liquid crystal displays (LCDs), In order to prevent the damage|wound with respect to a display surface from occurring, it is preferable to form the optical film which has hard-coat property. In particular, in addition to the hard coat property, other performance is also calculated|required of the optical film applied corresponding to high quality-ization, large-size-ization, thin layering, longer life, etc. of the image display apparatus in recent years. As for such an optical film, the structure which has a hard-coat layer on a base material is common, and a cellulose acylate film is widely used as a base material.

A plasticizer may be added to the cellulose acylate film used as the base material of an optical film so that various characteristics may be satisfied.

Patent Documents 1 and 2 describe optical films using sugar ester compounds and polycondensation ester compounds as plasticizers.

Moreover, when forming a hard-coat layer on a cellulose acylate film base material, if the solvent which melt|dissolves cellulose acylate is used for the composition for hard-coat layer formation, this solvent will permeate into a cellulose acylate film, and a hard-coat layer It is known that by permeating the monomer in the composition for formation, the adhesion between the cellulose acylate film substrate and the hard coat layer is improved, or the interference nonuniformity is suppressed by eliminating the refractive index interface between the cellulose acylate film substrate and the hard coat layer (e.g. For example, Patent Document 3).

Japanese Patent Laid-Open No. 2013-101331 Japanese Laid-Open Patent Publication No. 2014-121790 Japanese Patent Laid-Open No. 2012-78541

However, when forming a hard coat layer on a cellulose acylate film substrate containing a sugar ester compound or a polycondensation ester compound, when only a solvent for dissolving cellulose acylate is used in the composition for forming a hard coat layer, the cellulose acylate film It was found that since the sugar ester compound and the polycondensation ester compound are difficult to be extracted from the substrate with this solvent, a refractive index interface is formed between the cellulose acylate film substrate and the hard coat layer, and there is a problem that interference unevenness occurs.

In order to solve this problem, in addition to the solvent for dissolving cellulose acylate, it was found that the problem of interference nonuniformity is improved when methanol, which is a solvent for extracting the sugar ester compound and the polycondensation ester compound favorably, is used.

However, when a solvent with low surface tension containing methanol is used in a large amount, when drying unevenness occurs during drying, the difference in surface tension between the dried portion and the non-dried portion becomes large, resulting in wind unevenness or streaks on the surface of the hard coat layer. A new problem has arisen.

The objective of this invention is to provide the manufacturing method of the optical film by which generation|occurrence|production of interference nonuniformity was suppressed and generation|occurrence|production of the wind nonuniformity and streaks on the hard-coat layer surface was suppressed. Moreover, it exists in providing the optical film manufactured by this manufacturing method, the polarizing plate containing an optical film, and an image display apparatus.

As a result of intensive studies by the present inventors, by containing a specific amount of methanol in the composition for forming a hard coat layer, the occurrence of interference unevenness is suppressed, and by containing a specific amount of a solvent having a specific surface tension, the occurrence of wind unevenness and streaks is reduced. I've found something that can be suppressed.

That is, the problem to be solved by the present invention can be solved by the following configuration.

[One]

On a cellulose acylate film base material containing at least one compound selected from a sugar ester compound and a polycondensation ester compound, the following (a) to (d) are contained, and the following (1) to (3) The manufacturing method of the optical film which apply|coats the composition for hard-coat layer formation which satisfy|fills the conditions of and forms a hard-coat layer.

(a) polyfunctional (meth)acrylate compound

(b) methanol

(c) a solvent for dissolving cellulose acylate

(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent

(1): (b) Content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation.

(2): Content of the solvent which melt|dissolves (c) cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation.

(3): With respect to the total mass of the solvent in the composition for hard-coat layer formation, the solvent whose surface tension in 20 degreeC is less than 23 mN/m contains 10 mass % - 30 mass % in total.

[2]

The manufacturing method of the optical film as described in [1] whose content of the said methanol is 10 mass % - 25 mass % with respect to the total mass of the solvent in the said composition for hard-coat layer formation.

[3]

With respect to the total mass of the solvent in the composition for forming a hard coat layer, the solvent having a surface tension of less than 23 mN/m at 20°C contains 10% by mass to 25% by mass in a total amount according to [1] or [2]. A method of manufacturing an optical film.

[4]

The method for producing an optical film according to any one of [1] to [3], wherein the sugar ester compound has a structure represented by the following general formula (1).

(HO)_m-G-(L-R_One)_n General formula (1)

In the general formula (1), G represents a monosaccharide residue or a disaccharide residue. R ₁ each independently represents an aliphatic group or an aromatic group. L each independently represents a divalent linking group. m is an integer greater than or equal to 0, and n is a natural number greater than or equal to 1.

[5]

The polycondensation ester compound according to any one of [1] to [4], wherein the polycondensation ester compound is a compound obtained from at least one dicarboxylic acid having an aromatic ring and at least one aliphatic diol having an average carbon number of 2.5 to 8.0. A method of manufacturing an optical film.

[6]

The said composition for hard-coat layer formation is 23 mN/m or more in surface tension at 20 degreeC, The optical film in any one of [1]-[5] containing the solvent which does not melt|dissolve cellulose acylate. manufacturing method.

[7]

(d) at least one kind of leveling agent selected from the silicone-based leveling agent and the fluorine-based leveling agent includes at least one repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by the following general formula (2); Production of the optical film according to any one of [1] to [6], which is a fluoroaliphatic group-containing copolymer (1) containing at least one repeating unit derived from a monomer (B) not containing an aliphatic group Way.

[Formula 1]

In general formula (2), R ₀ represents a hydrogen atom, a halogen atom, or a methyl group, L represents a divalent coupling group, and n represents an integer of 1 or more and 18 or less.

[8]

(d) at least one type of leveling agent selected from the silicone-based leveling agent and the fluorine-based leveling agent is at least one type of repeating unit derived from the fluoroaliphatic group-containing monomer (C) represented by the following general formula (3); Production of the optical film according to any one of [1] to [6], which is a fluoroaliphatic group-containing copolymer (2) containing at least one repeating unit derived from a monomer (B) not containing an aliphatic group Way.

[Formula 2]

In General Formula (3), R ₃ represents a hydrogen atom, a halogen atom or a methyl group, L ₂ represents a divalent linking group, and n represents an integer of 1 or more and 6 or less.

[9]

The manufacturing method of the optical film in any one of [1]-[8] which has a process of further forming a low-refractive-index layer on the said hard-coat layer.

[10]

(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent, the fluoroaliphatic group-containing copolymer (1) of [7] and the fluoroaliphatic group-containing copolymer of [8] (2) The manufacturing method of the optical film as described in [9] containing.

[11]

The proportion contained in the total solid content of the fluoroaliphatic group-containing copolymer (1) is 0.01 to 0.2 mass%, and the proportion contained in the total solid content of the fluoroaliphatic group-containing copolymer (2) is 0.001 to 0.01 mass%. The method for producing an optical film according to phosphorus [10].

[12]

An optical film produced by the method for producing an optical film according to any one of [1] to [11].

[13]

A polarizing plate comprising an optical film produced by the method for producing an optical film according to any one of [1] to [11].

[14]

An image display device comprising at least any one of the optical film produced by the method for producing the optical film according to any one of [1] to [11] and the polarizing plate according to [13].

ADVANTAGE OF THE INVENTION According to this invention, while generation|occurrence|production of interference unevenness is suppressed, generation|occurrence|production of wind unevenness and streaks on the hard-coat layer surface can be prevented, the manufacturing method of the optical film which has favorable abrasion resistance and pencil hardness, this manufacturing method The manufactured optical film, the polarizing plate containing the optical film, and the image display apparatus using the same can be provided.

Although the description of the structural requirements described below may be made based on the representative embodiment of this invention, this invention is not limited to such an embodiment. In addition, the numerical range shown using "-" in this specification means the range which includes the numerical value described before and after "-" as a lower limit and an upper limit.

In addition, when not specifically limited, "(meth)acrylate" represents an acrylate and a methacrylate, and "(meth)acryl" represents an acryl and methacryl.

<Method for producing optical film>

The manufacturing method of the optical film of this invention contains the following (a)-(d) on the cellulose acylate film base material containing at least 1 sort(s) of compound chosen from a sugar ester compound and a polycondensation ester compound, Moreover, it is a manufacturing method of the optical film which apply|coats the composition for hard-coat layer formation which satisfy|fills the conditions of the following (1)-(3), and forms a hard-coat layer.

(a) polyfunctional (meth)acrylate compound

(b) methanol

(c) a solvent for dissolving cellulose acylate

(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent

(1): (b) Content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation.

(2): Content of the solvent which melt|dissolves (c) cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation.

(3): With respect to the total mass of the solvent in the composition for hard-coat layer formation, the solvent whose surface tension in 20 degreeC is less than 23 mN/m contains 10 mass % - 30 mass % in total.

[Cellulose acylate film]

The cellulose acylate film used for the manufacturing method of this invention consists of cellulose acylate. It does not specifically limit about a cellulose acylate. Examples of cellulose as the raw material for acylate include cotton linter and wood pulp (hardwood pulp and softwood pulp), and cellulose acylate obtained from any raw material cellulose may also be used, or may be mixed in some cases. The detailed description of these raw material cellulose is, for example, Maruzawa, Utazer, "Plastic Material Lecture (17) Fiber-based resin" The Daily Kogyo Shimbun (published in 1970), or Publication No. 2001-1745 of the Invention Association. The cellulose described in (pages 7 to 8) can be used.

The cellulose acylate preferably used in the present invention will be briefly described. The β-1,4-bonded glucose unit constituting cellulose has hydroxyl groups freed at the 2-position, 3-position, and 6-position. Cellulose acylate is a polymer (polymer) in which some or all of these hydroxyl groups are esterified with an acyl group having 2 or more carbon atoms. The acyl substitution degree means the ratio (100% esterification is substitution degree 1) by which the hydroxyl group of the cellulose located at 2-position, 3-position, and 6-position is esterified.

Total acyl substitution degree, ie, DS2 + DS3 + DS6, is preferably 1.5 to 3.0, more preferably 2.0 to 3.0, still more preferably 2.5 to 3.0, still more preferably 2.7 to 3.0, and 2.70 It is particularly preferred that it is ∼ 2.98. Moreover, it is preferable that it is 2.80-2.95 depending on a case from a viewpoint of film forming property, and it is especially more preferable that it is 2.85-2.90. Here, DS2 is the degree of substitution of the hydroxyl group at the 2-position of the glucose unit by the acyl group (hereinafter also referred to as "acyl substitution degree at the 2-position"), and DS3 is the degree of substitution of the hydroxyl group at the 3-position by the acyl group ( Hereinafter, also referred to as "degree of acyl substitution at 3-position"), and DS6 is the degree of substitution of the hydroxyl group at 6-position with an acyl group (hereinafter, also referred to as "acyl substitution at 6-position"). Moreover, DS6/(DS2+DS3+DS6) is the ratio of the acyl substitution degree at 6th-position with respect to all the acyl substitution degrees, and is also called "acyl substitution rate at 6th-position" hereinafter.

Regarding these celluloses, the description of Paragraph Nos. 0034 to 0039 of International Publication No. 2011/102492 can be referred to.

<Additives>

The cellulose acylate film used for this invention contains the at least 1 sort(s) of compound chosen from a sugar ester compound and a polycondensation ester compound. These compounds are preferably used as plasticizers. Moreover, the cellulose acylate film used for this invention may contain another additive. When the additive is contained, in addition to controlling the humidity dimensional change rate, it exhibits useful effects from the viewpoint of film modification such as improvement of thermal properties, optical properties, and mechanical properties of the film, imparting flexibility, imparting water absorption resistance, and reducing moisture permeability. In addition, an additive points out all components other than cellulose acylate, for example, a plasticizer, a ultraviolet absorber, microparticles|fine-particles, etc. are mentioned.

<Sugar Ester Compound>

When a sugar ester compound is added as a plasticizer to the cellulose acylate film used in the present invention, there is an advantage in that the mechanical properties of the film can be controlled.

Since a sugar ester compound has good compatibility with a cellulose ester, bleed-out does not generate|occur|produce easily at the time of film forming and heat-stretching, and since it has a bulk structure, it becomes possible to improve the hardness of a film.

The sugar ester compound is preferably a sugar ester compound in which an acyl group is introduced into the pyranose ring or the furanose ring. About the sugar ester compound, description of Unexamined-Japanese-Patent No. 2012-181516 - [0092] (sugar ester compound) can be referred.

It is preferable that a sugar ester compound is a compound represented by the following general formula (1).

General formula (1)

(HO) _m -G-(LR ₁ ) _n

In formula (1), G represents a monosaccharide residue or a disaccharide residue. R ₁ each independently represents an aliphatic group or an aromatic group. L each independently represents a divalent linking group. m is an integer greater than or equal to 0, and n is a natural number greater than or equal to 1.

A sugar ester compound refers to a compound in which at least one of the substitutable groups (eg, hydroxyl group, carboxyl group) in the sugar skeleton structure constituting the compound and at least one substituent are ester-bonded. That is, the sugar ester compound referred to herein includes sugar derivatives in a broad sense, and also includes compounds containing, for example, a sugar moiety such as gluconic acid as a structure. That is, the ester of glucose and carboxylic acid and the ester of gluconic acid and alcohol are contained in a sugar ester compound.

It is preferable that the sugar ester compound represented by General formula (1) which can be used for this invention is a compound which has a furanose structure or a pyranose structure. When it has a furanose structure or a pyranose structure as a sugar skeleton, it is m+n≥4 in General formula (1).

In the case of having a furanose structure or a pyranose structure as a sugar skeleton, m + n is the number of hydroxyl groups assuming that G is not a residue but an unsubstituted saccharide of a cyclic acetal structure of the same skeleton. It is also possible to satisfy the condition that is equal to .

In addition, the upper limit of m + n can employ|adopt a value determined according to the type of G, and becomes 5 when G is a monosaccharide residue, and becomes 8 when G is a disaccharide residue.

Examples of the sugar ester compound represented by the general formula (1) include glucose, galactose, mannose, fructose, xylose, arabinose, lactose, sucrose, nystose, 1F-fructosylnistose, and stachyose. , maltitol, lactitol, lactulose, cellobiose, maltose, cellotriose, maltotriose, raffinose or kestose. In addition, gentiobiose, gentiotriose, gentiotetraose, xylotriose, galactosylsucrose, etc. are mentioned, but are not limited to these. In particular, a compound having both a furanose structure and a pyranose structure is preferable. As examples, sucrose, kestose, nystose, 1F-fructosylnistose, stachyose, etc. are preferable, and sucrose is more preferable.

The substituent used to esterify all or part of the hydroxyl groups in the compound is not particularly limited. Especially, it is preferable to use a monocarboxylic acid. It is preferable that R< ₁ > in General formula (1) represents an acyl group each independently.

There is no restriction|limiting in particular as monocarboxylic acid, Well-known aliphatic monocarboxylic acid, alicyclic monocarboxylic acid, aromatic monocarboxylic acid, etc. can be used. The number of carboxylic acids used may be one, and 2 or more types of mixture may be sufficient as them. When there are two or more R< ₁ >, it may mutually be same or different.

On the other hand, it is preferable that each of L in the general formula (1) independently represents a single bond, -O-, -CO-, or -NR ₁₁ - (R ₁₁ represents a monovalent substituent).

Although the specific example of the sugar ester compound represented by General formula (1) which can be used for this invention below is given, this invention is not limited to this.

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

In the following structural formulas, R each independently represents an arbitrary substituent, and a plurality of R may be the same or different. In the following Tables 1-4, the substituents 1 and 2 each represent arbitrary R. In addition, substitution degree shows the number which R represents by a substituent. "None" indicates that R is a hydrogen atom.

[Formula 8]

[Formula 9]

[Formula 10]

[Formula 11]

When adding a sugar ester compound to the cellulose acylate film used for this invention, it is preferable that content of a sugar ester compound is 0.1 mass part or more and 20 mass parts or less with respect to 100 mass parts of cellulose acylate, 0.1 mass part or more It is more preferable that it is 15 mass parts or less.

<Polycondensation Ester Compound>

The polycondensation ester compound is preferably obtained from a compound obtained from at least one dicarboxylic acid having an aromatic ring (also referred to as an aromatic dicarboxylic acid) and at least one aliphatic diol having an average carbon number of 2.5 to 8.0. do. Moreover, it is also preferable to obtain from the mixture of an aromatic dicarboxylic acid and at least 1 type of aliphatic dicarboxylic acid, and at least 1 type of aliphatic diol whose average carbon number is 2.5-8.0.

Calculation of the average carbon number of a dicarboxylic acid residue is performed separately for a dicarboxylic acid residue and a diol residue.

Let the value calculated by multiplying the composition ratio (mol fraction) of the dicarboxylic acid residue by the number of constituent carbons to be the average number of carbons. For example, when the adipic acid residue and the phthalic acid residue are constituted by 50 mol% each, the average carbon number is 7.0.

Moreover, it is the same also in the case of a diol residue, and let the average carbon number of a diol residue be the value computed by multiplying the composition ratio (mol fraction) of a diol residue by the number of constituent carbons. For example, when it consists of 50 mol% of ethylene glycol residues and 50 mol% of 1,2-propanediol residues, an average carbon number will be 2.5.

It is preferable that it is 500-2000, as for the number average molecular weight of polycondensation ester, 600-1500 are more preferable, and 700-1200 are still more preferable. If the number average molecular weight of the polycondensation ester is 500 or more, volatility becomes low, and film failure or process contamination by volatilization under high-temperature conditions at the time of extending|stretching of a cellulose acylate film becomes hard to generate|occur|produce. Moreover, compatibility with a cellulose acylate becomes it high that it is 2000 or less, and it becomes difficult to generate|occur|produce the bleed-out at the time of film forming and heat-stretching.

The number average molecular weight of the polycondensation ester can be measured and evaluated by gel permeation chromatography. Moreover, in the case of a polyester polyol without a terminal sealing, it is also computable with the quantity of hydroxyl groups per weight (henceforth a hydroxyl group is also mentioned). In this specification, after acetylating a polyester polyol, a hydroxyl value measures the quantity (mg) of potassium hydroxide required for neutralization of excess acetic acid.

When using the mixture of aromatic dicarboxylic acid and aliphatic dicarboxylic acid as a dicarboxylic acid component, it is preferable that it is dicarboxylic acid whose average carbon number of a dicarboxylic acid component is 5.5-10.0, More preferably, 5.6 to 8.

If the average of carbon number is 5.5 or more, the polarizing plate excellent in durability can be obtained. When the average number of carbon atoms is 10 or less, compatibility with cellulose acylate is excellent, and bleed-out can be suppressed in the film forming process of a cellulose acylate film.

An aromatic dicarboxylic acid residue is contained in the polycondensation ester obtained from diol and dicarboxylic acid containing aromatic dicarboxylic acid.

In this specification, a residue is a partial structure of polycondensation ester, and shows the partial structure which has the characteristic of the monomer which forms the polycondensation ester. For example, the dicarboxylic acid residue formed from the dicarboxylic acid HOOC-R-COOH is -OC-R-CO-.

It is preferable that it is 40 mol% or more, and, as for the aromatic dicarboxylic acid residue ratio of the said polycondensation ester, it is more preferable that they are 40 mol% - 95 mol%.

By making the aromatic dicarboxylic acid residue ratio 40 mol% or more, the cellulose acylate film which shows sufficient optical anisotropy can be obtained, and the polarizing plate excellent in durability can be obtained. Moreover, when it is 95 mol% or less, it is excellent in compatibility with a cellulose acylate, and it can make it hard to generate|occur|produce bleed-out also at the time of film forming of a cellulose acylate film, and the time of heat-stretching.

Examples of the aromatic dicarboxylic acid that can be used for the formation of the polycondensation ester compound include phthalic acid, terephthalic acid, isophthalic acid, 1,5-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,8-naphthalenedicarboxylic acid, or 2,6-naphthalenedicarboxylic acid etc. are mentioned. Among these, phthalic acid, terephthalic acid, and 2,6-naphthalenedicarboxylic acid are preferable, phthalic acid and terephthalic acid are more preferable, and terephthalic acid is still more preferable.

The aromatic dicarboxylic acid residue derived from the aromatic dicarboxylic acid used for mixing is formed in polycondensation ester.

That is, the aromatic dicarboxylic acid residue preferably contains at least one of a phthalic acid residue, a terephthalic acid residue and an isophthalic acid residue, more preferably at least one of a phthalic acid residue and a terephthalic acid residue, further preferably preferably contains a terephthalic acid residue.

By using terephthalic acid as an aromatic dicarboxylic acid for mixing in the formation of polycondensation ester, compatibility with cellulose acylate is more excellent, and bleed-out is well prevented even at the time of film forming and heat stretching of a cellulose acylate film. It can be set as the cellulose acylate film which does not generate|occur|produce. Moreover, 1 type may be sufficient as the said aromatic dicarboxylic acid, and 2 or more types may be used for it. When using 2 types, it is preferable to use a phthalic acid and a terephthalic acid.

By using together 2 types of aromatic dicarboxylic acid of phthalic acid and terephthalic acid, polycondensation ester in normal temperature can be softened, and it is preferable at the point which handling becomes easy.

It is preferable that content of the terephthalic acid residue in the dicarboxylic acid residue of polycondensation ester is 40 mol% - 100 mol%.

When the terephthalic acid residue ratio is 40 mol% or more, a cellulose acylate film exhibiting sufficient optical anisotropy is obtained.

An aliphatic dicarboxylic acid residue is contained in the polycondensation ester obtained from dicarboxylic acid containing diol and an aliphatic dicarboxylic acid.

The aliphatic dicarboxylic acid capable of forming the polycondensation ester compound includes, for example, oxalic acid, malonic acid, succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, or 1,4-cyclohexanedicarboxylic acid;

In the polycondensation ester, an aliphatic dicarboxylic acid residue derived from the aliphatic dicarboxylic acid used for mixing is formed.

It is preferable that average carbon number is 5.5-10.0, as for an aliphatic dicarboxylic acid residue, it is more preferable that it is 5.5-8.0, It is still more preferable that it is 5.5-7.0. If the average carbon number of the aliphatic dicarboxylic acid residue is 10.0 or less, the heating loss of the compound can be reduced, and the occurrence of planar failure, which is considered to be caused by process contamination due to bleed-out during drying of the cellulose acylate web, can be prevented. . Moreover, compatibility is excellent that the average carbon number of an aliphatic dicarboxylic acid residue is 5.5 or more, and precipitation of polycondensation ester does not occur easily, and it is preferable.

Specifically, it is preferable that the said aliphatic dicarboxylic acid residue contains a succinic acid residue, and when using 2 types, it is preferable to contain a succinic acid residue and an adipic acid residue.

That is, one type of aliphatic dicarboxylic acid may be used for mixing in formation of polycondensation ester, two or more types may be used, and when using two types, it is preferable to use succinic acid and adipic acid. . When using 1 type of aliphatic dicarboxylic acid for mixing in formation of polycondensation ester, it is preferable to use succinic acid. The average number of carbon atoms of the aliphatic dicarboxylic acid residue can be adjusted to a desired value, and it is preferred from the viewpoint of compatibility with cellulose acylate.

It is preferable to use 2 types or 3 types for dicarboxylic acid for mixing in formation of polycondensation ester. When using 2 types, it is preferable to use 1 type each of aliphatic dicarboxylic acid and aromatic dicarboxylic acid, and when using 3 types, 1 type for aliphatic dicarboxylic acid and 2 types for aromatic dicarboxylic acid Alternatively, two types of aliphatic dicarboxylic acids and one type of aromatic dicarboxylic acids can be used. It is because it is easy to adjust the value of the average carbon number of a dicarboxylic acid residue, content of an aromatic dicarboxylic acid residue can be made into a preferable range, and durability of a polarizer can be improved.

The polycondensation ester obtained from a dicarboxylic acid containing a diol and a dicarboxylic acid contains a diol residue.

In this specification, the diol residue formed from the diol HO-R-OH is -O-R-O-.

Examples of the diol forming the polycondensation ester include an aromatic diol and an aliphatic diol, and the polycondensation ester used in the plasticizer is preferably formed from at least an aliphatic diol.

The polycondensation ester preferably contains an aliphatic diol residue having an average carbon number of 2.5 to 7.0, more preferably an aliphatic diol residue having an average carbon number of 2.5 to 4.0. When the average carbon number of the aliphatic diol residue is less than 7.0, compatibility with cellulose acylate is improved, bleed-out is less likely to occur, and heat loss of the compound is not easily increased, and the cellulose acylate web is dried. Surface failure, which is thought to be caused by city process contamination, is unlikely to occur. Moreover, the synthesis|combination is easy if the average carbon number of an aliphatic diol residue is 2.5 or more.

Preferred examples of the aliphatic diol capable of forming the polycondensation ester compound include alkyldiol or alicyclic diol, for example, ethylene glycol, 1,2-propanediol, and 1,3-propanediol. , 1,2-butanediol, 1,3-butanediol, 2-methyl-1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol ( neopentyl glycol), 2,2-diethyl-1,3-propanediol (3,3-dimethylolpentane), 2-n-butyl-2-ethyl-1,3-propanediol (3,3-dimethyl olheptane), 3-methyl-1,5-pentanediol, 1,6-hexanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2- Methyl-1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,12-octadecanediol, diethylene glycol, cyclohexanedimethanol and the like are preferable. These are preferably used together with ethylene glycol as one type or a mixture of two or more types.

The more preferable aliphatic diol is at least one of ethylene glycol, 1,2-propanediol, and 1,3-propanediol, and particularly preferably at least one of ethylene glycol and 1,2-propanediol. . When the polycondensation ester is formed by using two types of the aliphatic diol, ethylene glycol and 1,2-propanediol are preferably used. Crystallization of the polycondensation ester can be prevented by using 1,2-propanediol or 1,3-propanediol.

A diol residue is formed in the said polycondensation ester by the diol used for mixing.

That is, the polycondensation ester preferably contains at least one of an ethylene glycol residue, a 1,2-propanediol residue, and a 1,3-propanediol residue as a diol residue, and an ethylene glycol residue or a 1,2- It is more preferable that it is a propanediol residue.

It is preferable that 10 mol% - 100 mol% of ethylene glycol residues are contained in the aliphatic diol residue contained in the said polycondensation ester, It is more preferable that 20 mol% - 100 mol% are contained.

Without sealing the terminal of the said polycondensation ester, it is good also as diol or carboxylic acid, and also may make monocarboxylic acids or monoalcohols react, and may perform what is called terminal sealing.

As monocarboxylic acids used for sealing, acetic acid, propionic acid, butanoic acid, benzoic acid, etc. are preferable. As monoalcohols used for sealing, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, etc. are preferable, and methanol is the most preferable. When carbon number of monocarboxylic acids used for the terminal of polycondensation ester is 7 or less, heating loss of a compound does not become large, and planar failure does not generate|occur|produce.

It is more preferable that the terminal of the polycondensation ester is not sealed and remains a diol residue, or is sealed with acetic acid, propionic acid, or benzoic acid.

The both ends of the polycondensation ester are irrespective of whether sealing is performed or not.

When both ends of the condensate are unsealed, the polycondensation ester is preferably a polyester polyol.

As one aspect of the polycondensation ester, a polycondensation ester in which the carbon number of the aliphatic diol residue is 2.5 to 8.0 and both ends of the polycondensation ester is unsealed is mentioned.

When both ends of the polycondensation ester are sealed, it is preferable to react with a monocarboxylic acid to seal it. At this time, both ends of the polycondensation ester are monocarboxylic acid residues. In the present specification, the monocarboxylic acid residue formed from the monocarboxylic acid R-COOH is R-CO-. When both ends of the polycondensation ester are sealed with a monocarboxylic acid, the monocarboxylic acid is preferably an aliphatic monocarboxylic acid residue, and the monocarboxylic acid residue is an aliphatic monocarboxylic acid residue having 22 or less carbon atoms. It is more preferable, and it is still more preferable that it is a C3 or less aliphatic monocarboxylic acid residue. Moreover, it is preferable that it is a C2 or more aliphatic monocarboxylic acid residue, and it is especially preferable that it is a C2 aliphatic monocarboxylic acid residue.

As one aspect of the said polycondensation ester, the polycondensation ester in which carbon number of the aliphatic diol residue is more than 2.5 and 7.0 or less, and both ends of the polycondensation ester are sealed with the monocarboxylic acid residue is mentioned.

When the number of carbon atoms of the monocarboxylic acid residue sealing both ends of the polycondensation ester is 3 or less, the volatility is lowered and the loss due to heating of the polycondensation ester does not increase, thereby reducing the occurrence of process contamination and surface failure. it is possible to do

That is, as monocarboxylic acids used for sealing, an aliphatic monocarboxylic acid is preferable, it is more preferable that a monocarboxylic acid is a C2-C22 aliphatic monocarboxylic acid, It is a C2-C3 aliphatic monocarboxylic acid It is more preferable, and it is especially preferable that it is a C2 aliphatic monocarboxylic acid residue.

For example, acetic acid, propionic acid, butanoic acid, benzoic acid and derivatives thereof are preferable, acetic acid or propionic acid is more preferable, and acetic acid is most preferable.

The monocarboxylic acid used for sealing may mix 2 or more types.

Both ends of the polycondensation ester are preferably sealed with acetic acid or propionic acid, and most preferably both ends become acetyl ester residues (sometimes referred to as acetyl residues) by sealing with acetic acid.

When both ends of the polycondensation ester are sealed, a cellulose acylate film can be obtained that does not have a solid state at room temperature, has good handling, and has excellent humidity stability and durability of the polarizing plate.

Specific examples A-1 to A-34 of the polycondensation ester are described in Table 5 below, but are not limited thereto.

The abbreviations in Table 5 show the following compounds, respectively. PA: phthalic acid, TPA: terephthalic acid, AA: adipic acid, SA: succinic acid, 2,6-NPA: 2,6-naphthalenedicarboxylic acid.

As a specific example of the said polycondensation ester, the following A-35 - A-39 are also mentioned further.

A-35: PA/ethanediol/terminal acetyl ester group

A-36: PA / propylene glycol / terminal acetyl ester group

A-37: PA / propylene glycol / terminal benzoyl ester group

A-38: AA / propylene glycol / terminal benzoyl ester group

A-39: TPA/propylene glycol/terminal methylbenzoyl ester group

The synthesis of the polycondensation ester is a thermal melt condensation method by a polyesteration reaction or a transesterification reaction between a diol and a dicarboxylic acid by a conventional method, or an interfacial condensation method between an acid chloride of these acids and a glycol. It can be easily synthesized by any method. In addition, about the said polycondensation ester, there is a detailed description in Koichi Murai's editorial "Theory and application of plasticizers" (Saiwai Shobo Co., Ltd., first edition published on March 1, 1973). In addition, Japanese Patent Application Laid-Open No. Hei05-155809, Japanese Patent Application Laid-Open No. Hei05-155810, Japanese Patent Application Laid-Open No. Hei5-197073, Japanese Unexamined Patent Publication No. 2006-259494, and Japanese Patent Application Laid-Open No. Hei07-330670 , Japanese Patent Application Laid-Open No. 2006-342227, Japanese Patent Application Laid-Open No. 2007-003679, etc. can also be used.

When adding a polycondensation ester compound to the cellulose acylate film used in the present invention, the content of the polycondensation ester compound is preferably 0.1 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of cellulose acylate, 0.1 mass It is more preferable that it is more than part and 15 mass parts or less.

<Ultraviolet absorbent>

The cellulose acylate film used for this invention may contain a ultraviolet absorber as an additive. Examples of the ultraviolet absorber include a hindered phenol-based compound, a hydroxybenzophenone-based compound, a benzotriazole-based compound, a salicylic acid ester-based compound, a benzophenone-based compound, a cyanoacrylate-based compound, and a nickel complex salt-based compound. can As a specific example, the compound described in Paragraph [0121] of Unexamined-Japanese-Patent No. 2012-181516 is mentioned.

The content of the ultraviolet absorber is preferably 0.0001 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of cellulose acylate, more preferably 0.0001 parts by mass or more and 5 parts by mass or less, and still more preferably 0.001 parts by mass or more and 3 parts by mass or less. .

<Particulate Additives>

It is preferable to add microparticles|fine-particles to the surface of a cellulose acylate film in order to provide sliding property between films, and to prevent blocking. As these microparticles|fine-particles, the surface is coat|covered with a hydrophobic group, and the silica (silicon dioxide, SiO2) which has taken the form of _secondary particle|grains is used preferably. Further, in the fine particles, together with or instead of silica, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, calcium phosphate, etc. of fine particles may be used.

These microparticles|fine-particles function as a so-called mat agent, minute unevenness|corrugation is formed on the film surface by the addition of microparticles|fine-particles, and even if films overlap with this unevenness|corrugation, it does not stick to each other, but the sliding property of films is ensured. At this time, the micro-irregularities caused by the protrusions protruding from the film surface are particularly effective in improving the sliding properties and blocking properties when there are 10 ⁴ protrusions/mm 2 or more having a height of 30 nm or more.

It is preferable in order to improve the blocking property and slipperiness|lubricating property without the haze raise of a film to provide especially to the surface layer of mat-made microparticles|fine-particles. As a method of providing microparticles|fine-particles to the surface layer, the means by multilayer casting, application|coating, etc. are mentioned.

When a contact surface pressure becomes high in a film roll, the parts where a film overlaps will stick with a certain probability, and it will become difficult to slide. In this way, the phenomenon in which the superimposed films stick to each other due to, for example, excessive pressure being applied to the surface of the film is also called blocking. Since the films are stuck together, they become less slippery, so that the deformation|transformation at the time of winding up a film is not relieve|moderated by sliding. For this reason, in conventional film rolls, dents and creases along the circumferential direction called deformation, irregularities of the winding core, and a film deformation at the time of winding are caused by a film deformation on the winding core side. (hereinafter referred to as deep-side transfer failure) or the like occurs. This deformation, wrinkles, and deep-side transfer failure are likely to occur due to a decrease in the film thickness or the elastic modulus of the film.

In the film roll, in the area|region part (use part) provided for use between knurling parts, the contact surface pressure within the range of 0.01 MPa or more and 0.10 MPa or less is applied.

The contact surface pressure applied to the film portion in the vicinity of the core tends to increase as the film becomes longer. On the core side of the elongate film of less than 4000 m in length, a contact surface pressure of about 0.05 MPa or more and 0.10 MPa or less is applied. Therefore, conventionally, when the film is shorter than 2000 m, no major problem has arisen. For example, if the film is long, such as within the range of 2000 m or more and 10000 m or less, blocking, deformation, wrinkling, or deep transfer failure. This was prone to occur.

Also, conventionally, for example, if the film is thin, such as in the range of 10 µm or more and 65 µm or less, blocking, deformation, wrinkles, and core transfer failure are likely to occur when winding on a core to form a film roll. tended to In addition, in the prior art, for example, when the elastic modulus of the film is low, such as in the range of 1.0 GPa or more and 4.0 GPa or less, blocking, deformation, wrinkling, and core transfer failure occur when winding on a core to form a film roll. easy to do.

For improvement of such winding aptitude, the improvement of the blocking property and sliding property by provision of the micro unevenness|corrugation on the film surface is effective. In particular, when the contact surface pressure between the films is 0.05 MPa or more and the static friction coefficient is 1.2 or less in the range of 0.10 MPa, slip occurs between the overlapping portions of the films, so the occurrence of blocking, deformation, wrinkles, and deep transfer failure is reduced. . It is preferable that the coefficient of static friction of the portion within the range of the contact surface pressure of 0.05 MPa or more and 0.10 MPa or less is 1.0 or less, and more preferably that the coefficient of static friction of the portion within the range of the contact surface pressure of 0.05 MPa or more and 0.10 MPa or less is 0.9 or less.

Next, the hard-coat layer is demonstrated. In this invention, an optical film can be formed by apply|coating, drying, and hardening the composition for hard-coat layer formation containing the following (a)-(d) on the said cellulose acylate film base material.

In this invention, a hard-coat layer means the layer by which pencil hardness of a transparent support body improves (hardness becomes high) by forming the said layer. Practically, as for the pencil hardness (JIS K5400) after hard-coat layer lamination|stacking, H or more are preferable, More preferably, it is 2H or more, Most preferably, it is 3H or more.

As for the thickness of a hard-coat layer, 1-35 micrometers is preferable, More preferably, it is 1-25 micrometers, Most preferably, it is 1.5-15 micrometers.

In the present invention, the number of hard-coat layers may be one or plural. When a hard-coat layer is multiple, it is preferable that the sum total of the film thickness of all the hard-coat layers is the said range.

Even if the surface of the hard-coat layer of the optical film of this invention may be flat, even if there may be unevenness|corrugation, it is not cared about. Moreover, you can also make a hard-coat layer contain translucent particle|grains for surface unevenness|corrugation and provision of internal scattering as needed.

Below, the detail about each component contained in the composition for hard-coat layer formation is described.

<(a) polyfunctional (meth)acrylate compound>

The compound having an unsaturated double bond contained in the composition for forming a hard coat layer can function as a binder, and in particular, a polyfunctional monomer having two or more polymerizable unsaturated groups can function as a curing agent, and the strength and scratch resistance of the coating film It becomes possible to improve

The composition for hard-coat layer formation used in this invention contains (a) a polyfunctional (meth)acrylate compound. A polyfunctional (meth)acrylate compound shows the compound which contains two or more (meth)acryloyl groups in a molecule|numerator.

Examples of the polyfunctional (meth)acrylate compound include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol (meth)acrylate, ethylene Glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, EO modified Trimethylolpropane tri(meth)acrylate, PO modified trimethylolpropane tri(meth)acrylate, EO modified phosphoric acid tri(meth)acrylate, trimethylolethane tri(meth)acrylate, ditrimethylolpropanetetra(meth) Acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, pentaerythritol hexa (meth) acrylate, 1,2, 3-cyclohexanetetra(meth)acrylate, polyurethane polyacrylate, polyester polyacrylate, caprolactone modified tris(acryloxyethyl)isocyanurate, etc. are mentioned.

A commercially available polyfunctional acrylate compound having a (meth)acryloyl group may be used, and examples include NK Ester A-TMMT manufactured by Shin-Nakamura Chemical Industry Co., Ltd. and KAYARAD DPHA manufactured by Nippon Kayaku Co., Ltd. have. About a polyfunctional monomer, it describes in paragraphs [0114] - [0122] of Unexamined-Japanese-Patent No. 2009-98658, and it is the same also in this invention. It is also preferable to use multiple types of monomers together in order to balance curl and hardness, or to control the permeation to a base material.

Content of the polyfunctional (meth)acrylate compound in the composition for hard-coat layer formation of this invention provides a sufficient polymerization rate, in order to provide hardness etc. with respect to the total solid except the inorganic component in the composition for hard-coat layer formation. , 50 mass % or more is preferable, 60-99 mass % is more preferable, 70-99 mass % is still more preferable, 80-99 mass % is especially preferable.

In the present invention, as the polyfunctional (meth)acrylate compound contained in the composition for forming a hard coat layer, it is also preferable to use a compound containing a cyclic aliphatic hydrocarbon and two or more (meth)acryloyl groups in the molecule. do. By using such a compound, low moisture permeability can be provided to a hard-coat layer.

When the composition for forming a hard coat layer contains a compound containing a cyclic aliphatic hydrocarbon and two or more (meth)acryloyl groups in the molecule, it contains a cyclic aliphatic hydrocarbon and two or more (meth)acryloyl groups in the molecule 1-90 mass % is preferable in the polyfunctional (meth)acrylate compound in the composition for hard-coat layer formation, as for the compound to make, 2-80 mass % is more preferable, 5-70 mass % is especially preferable.

When the composition for forming a hard coat layer contains a polyfunctional (meth)acrylate compound containing a cyclic aliphatic hydrocarbon and two or more (meth)acryloyl groups in a molecule, additionally a (meth)acrylate compound having a function of five or more It is preferable to contain

When the composition for hard-coat layer formation contains a 5 functional or more (meth)acrylate compound further, a 5-functional or more functional (meth)acrylate compound is a polyfunctional (meth)acrylate compound in the composition for hard-coat layer formation. Among them, 1-70 mass % is preferable, 2-60 mass % is more preferable, 5-50 mass % is especially preferable.

<(b) methanol>

The composition for hard-coat layer formation used in this invention contains methanol as a solvent. Since methanol can extract sugar ester compounds and polycondensation ester compounds, by adding methanol to a solvent for dissolving cellulose acylate, a cellulose acylate film containing a sugar ester compound or polycondensation ester compound is described. Even when it is set as , the refractive index interface between the base material and the hard coat layer does not easily form, and the occurrence of interference non-uniformity can be suppressed.

However, if a large amount of a solvent with low surface tension containing methanol is contained in the composition for forming the hard coat layer, the difference in surface tension between the dried portion and the non-dried portion due to drying unevenness during drying of the hard coat layer becomes large, and wind Since unevenness and streaks may occur, it is necessary to appropriately control the content of methanol and the content of the low surface tension solvent. Moreover, when content of methanol increases too much, since the solubility of a cellulose acylate will fall, interference nonuniformity will worsen.

For this reason, content of methanol in the composition for hard-coat layer formation shall be 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation. When content of methanol is in the said range, while being able to suppress generation|occurrence|production of an interference nonuniformity, generation|occurrence|production of the wind nonuniformity and streaks at the time of hard-coat layer drying can also be prevented. It is preferable that it is 10-25 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation, and, as for content of methanol, it is more preferable that it is 10-20 mass %.

<(c) Solvent dissolving cellulose acylate>

The composition for hard-coat layer formation used in this invention contains the solvent which melt|dissolves a cellulose acylate as a solvent. If the composition for forming a hard coat layer contains a solvent that dissolves cellulose acylate, the solvent dissolves and permeates cellulose acylate when the hard coat layer is formed. The interface between the cellulose acylate base material and hard-coat layer containing a polycondensation ester compound disappears, and an interference nonuniformity can be suppressed.

(c) As a solvent for dissolving cellulose acylate, dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, dioxane, dioxolane, trioxane, tetrahydrofuran, anisole and phenol Ethers such as nettol, some ketones such as acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, and methylcyclohexanone, and formic acid Esters such as ethyl, propyl formate, n-pentyl formate, methyl acetate, methyl acetoacetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ-butyrolactone, furthermore, methyl cellosolve, cellosolve; Cellosolves such as butyl cellosolve and cellosolve acetate, as well as N-methyl-2-pyrrolidone (N-methylpyrrolidone), carbonate solvents represented by the following general formula (d1), etc. and methyl acetate, acetone, methyl ethyl ketone, and a carbonate solvent represented by the following general formula (d1) are preferable, and methyl acetate, acetone, dimethyl carbonate, and diethyl carbonate are more preferable. These solvents may be used individually by 1 type, and may be used in combination of 2 or more type.

[Formula 12]

In general formula (d1), Ra and Rb each independently represent an alkyl group, and a C1-C3 alkyl group is preferable. A methyl group, an ethyl group, n-propyl group, and isopropyl group are mentioned as a C1-C3 alkyl group.

(c) Content of the solvent which melt|dissolves a cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation. (c) While content of the solvent which melt|dissolves a cellulose acylate is in the said range, the permeation quantity to a base film becomes optimal, and favorable pencil hardness can be obtained, it can suppress that interference nonuniformity arises.

(c) It is preferable that it is 30-80 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation, as for content of the solvent which melt|dissolves a cellulose acylate, It is more preferable that it is 40-80 mass %, 55 It is most preferable that it is -80 mass %.

<(d) at least one leveling agent selected from a silicon-based leveling agent and a fluorine-based leveling agent>

The composition for hard-coat layer formation used in this invention contains the at least 1 sort(s) of leveling agent chosen from (d) a silicone type leveling agent and a fluorine type leveling agent.

Generally, a leveling agent has the effect of suppressing the film-thickness nonuniformity etc. resulting from the drying dispersion|variation by the local distribution of a drying wind, or improving the repelling of a coating material.

As a leveling agent, the at least 1 sort(s) of leveling agent specifically, selected from a silicon-type leveling agent and a fluorine-type leveling agent is used. Moreover, it is preferable that a leveling agent is an oligomer and a polymer rather than a low molecular compound.

When a leveling agent is added, the leveling agent rapidly moves and localizes on the surface of the applied liquid film, and the leveling agent is localized on the surface as it is even after the film is dried. is lowered It is preferable that the surface energy of a film|membrane is low from a viewpoint of preventing the film-thickness nonuniformity of a hard-coat layer, repelling, and nonuniformity.

As a preferable example of a silicone type leveling agent, what has a substituent in the terminal and/or a side chain of the compound chain containing two or more dimethylsilyloxy units as a repeating unit is mentioned. You may contain structural units other than dimethylsilyloxy in the compound chain containing dimethylsilyloxy as a repeating unit. The substituent may be the same or different, and it is preferable that there exist two or more. Examples of the preferable substituent include groups containing a polyether group, an alkyl group, an aryl group, an aryloxy group, a cinnamoyl group, an oxetanyl group, a fluoroalkyl group, a polyoxyalkylene group, and the like.

Although there is no restriction|limiting in particular in the number average molecular weight of a silicone leveling agent, It is preferable that it is 100,000 or less, It is more preferable that it is 50,000 or less, It is especially preferable that it is 1000-30000, It is most preferable that it is 1000-20000.

Examples of preferred silicone-based leveling agents include commercially available silicone-based leveling agents that do not have an ionizing radiation curing group, and are manufactured by Shin-Etsu Chemical Co., Ltd. X22-3710, X22-162C, X22-3701E, X22160AS, X22170DX, X224015, X22176DX, X22 -176F, X224272, KF8001, X22-2000, etc.; Chisso Co., Ltd. FM4421, FM0425, FMDA26, FS1265, etc.; Toray Dow Corning Co., Ltd. BY16-750, BY16880, BY16848, SF8427, SF8421, SH3746, SH8400, SF3771, SH3749, SH3748, SH8410 etc.; TSF series (TSF4460, TSF4440, TSF4445, TSF4450, TSF4446, TSF4453, TSF4452, TSF4730, TSF4770, etc.) manufactured by Momentive Performance Materials Japan, FGF502, SILWET series (SILWETL77, SILWETL2780, SILWETL7001, SILWETL7780, SILWETL7002) SILWETL7087, SILWETL7200, SILWETL7210, SILWETL7220, SILWETL7230, SILWETL7500, SILWETL7510, SILWETL7600, SILWETL7602, SILWETL7604, SILWETL7605, SILWETL7607, SILWETL7622, SILWETL7644, SILWETL7650, SILWETL7657, SILWETL8500, SILWETL8600, SILWETL8610, SILWETL8620, SILWETL720) 등을 들 수 있지만, 이것에 It is not limited.

X22-163A, X22-173DX, X22-163C, KF101, X22164A, X24-8201, X22174DX, X22164C, X222426, X222445, X222457, X222459, X22245, X221602 manufactured by Shin-Etsu Chemical Industries, Ltd. as having an ionizing radiation curing group. , X221603, X22164E, X22164B, X22164C, X22164D, TM0701 and the like; Silaplane series manufactured by Chisso Co., Ltd. (FM0725, FM0721, FM7725, FM7721, FM7726, FM7727, etc.); Toray Dow Corning Co., Ltd. SF8411, SF8413, BY16-152D, BY16-152, BY16-152C, 8388A etc.; Evonik Degusa Japan Co., Ltd. TEGO Rad2010, 2011, 2100, 2200N, 2300, 2500, 2600, 2700 etc.; BYK3500 by Big Chemie Japan Co., Ltd.; KNS5300 by Shin-Etsu Silicone Co., Ltd.; Although Momentive Performance Materials Japan make UVHC1105, UVHC8550, etc. are mentioned, It is not limited to this.

It is preferable that 0.01-0.5 mass % is contained in the total solid of the coating composition for hard-coat layers, and, as for the said leveling agent, 0.01-0.3 mass % is more preferable.

The fluorine-based leveling agent is a compound having a fluoroaliphatic group and, for example, an amphiphilic group in the same molecule that contributes to affinity for various compositions such as coatings and molding materials when this leveling agent is used as an additive, in the same molecule, and The same compound can generally be obtained by copolymerizing a monomer having a fluoroaliphatic group and a monomer having an amphiphilic group.

Representative examples of the monomer having an amphiphilic group copolymerized with the monomer having a fluoroaliphatic group include poly(oxyalkylene)acrylate, poly(oxyalkylene)methacrylate, and the like.

Preferred commercially available fluorine-based leveling agents that do not have an ionizing radiation curing group include Megapac series (MCF350-5, F472, F476, F445, F444, F443, F178, F470, F475, F479, F477, manufactured by DIC Corporation), F482, F486, TF1025, F478, F178K, etc.) ; Examples of the Neos Co., Ltd. Ftergent series (FTX218, 250, 245M, 209F, 222F, 245F, 208G, 218G, 240G, 206D, 240D, etc.) are mentioned, As what has an ionizing radiation curing machine, Daikin Industries Co., Ltd. ) Manufacture of Optool DAC; DIC Corporation's Defensa series (TF3001, TF3000, TF3004, TF3028, TF3027, TF3026, TF3025, etc.) and RS series (RS71, RS101, RS102, RS103, RS104, RS105, etc.) are mentioned, but are limited to these it's not going to be

As the fluorine-based leveling agent in the present invention, at least one type of repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by the following general formula (2) and a fluoroaliphatic group-free monomer (B) It is preferable that it is a fluoroaliphatic group containing copolymer (1) containing at least 1 sort(s) of the repeating unit derived from it.

[Formula 13]

In general formula (2), R ₀ represents a hydrogen atom, a halogen atom, or a methyl group, L represents a divalent coupling group, and n represents an integer of 1 or more and 18 or less.

The fluoroaliphatic group-containing monomer represented by the general formula (2) will be described in detail.

In the general formula (2), R ₀ represents a hydrogen atom, a halogen atom or a methyl group, more preferably a hydrogen atom or a methyl group. L represents a divalent linking group containing any of an oxygen atom, a nitrogen atom, and a sulfur atom, -COO-, -COO(R ⁵ )-, -COS-, -COS(R ⁵ )-, -CON(R ⁶ )-, -CON(R ⁵ )(R ⁶ )-, etc. are preferable. Here, R ⁵ represents an alkyl group having 1 or more and 8 or less carbon atoms, R ⁶ represents a hydrogen atom or an alkyl group having 1 or more and 8 or less carbon atoms. n represents an integer of 1 or more and 18 or less, more preferably 4 to 12, still more preferably 6 to 8, and most preferably 6 to n.

Further, in the fluoroaliphatic group-containing copolymer (1), two or more polymer units of the fluoroaliphatic group-containing monomer (A) represented by the general formula (2) may be contained as structural units.

The fluoroaliphatic group-containing monomer (A) represented by the general formula (2) is preferably a structure represented by the following general formula (2-1).

[Formula 14]

In the general formula (2-1), R ¹ represents a hydrogen atom, a halogen atom or a methyl group, X represents an oxygen atom, a sulfur atom or -N(R ² )-, m is an integer of 1 or more and 6 or less, n represents an integer of 1 or more and 18 or less. Here, R ² represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms which may have a substituent.

The fluoroaliphatic group-containing monomer represented by the general formula (2-1) will be described in detail.

In general formula (2-1), R< ¹ > represents a hydrogen atom, a halogen atom, or a methyl group, and a hydrogen atom and a methyl group are more preferable. X represents an oxygen atom, a sulfur atom or -N(R ² )-, more preferably an oxygen atom or -N(R ² )-, and still more preferably an oxygen atom. R ² represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, still more preferably a hydrogen atom or a methyl group. m represents an integer of 1 or more and 6 or less, 1-3 are more preferable, and it is still more preferable that it is 1. n represents an integer of 1 or more and 18 or less, more preferably 4 to 12, still more preferably 6 to 8, and most preferably 6 to n.

Moreover, in the said fluorine-type leveling agent, the polymerization unit of the fluoroaliphatic group containing monomer represented by General formula (2-1) may be contained as 2 or more types of structural units.

Moreover, as a fluorine-type leveling agent in this invention, at least 1 sort(s) of the repeating unit derived from the fluoroaliphatic group containing monomer (C) represented by the following general formula (3), and a monomer (B) which does not contain a fluoroaliphatic group It is also preferable that it is a fluoroaliphatic group containing copolymer (2) containing at least 1 type of repeating unit derived from ).

[Formula 15]

In General Formula (3), R ₃ represents a hydrogen atom, a halogen atom or a methyl group, L ₂ represents a divalent linking group, and n represents an integer of 1 or more and 6 or less.

The fluoroaliphatic group-containing monomer represented by the general formula (3) will be described in detail.

In general formula (3), R< ₃ > represents a hydrogen atom, a halogen atom, or a methyl group, and a hydrogen atom and a methyl group are more preferable. L ₂ represents a divalent linking group containing any of an oxygen atom, a nitrogen atom, and a sulfur atom, -COO-, -COO(R ⁵ )-, -COS-, -COS(R ⁵ )-, -CON( R ⁶ )-, -CON(R ⁵ )(R ⁶ )-, etc. are preferable. Here, R ⁵ represents an alkyl group having 1 or more and 8 or less carbon atoms, R ⁶ represents a hydrogen atom or an alkyl group having 1 or more and 8 or less carbon atoms. n represents an integer of 1 or more and 6 or less, 4-6 are more preferable, and 6 is still more preferable.

In the fluoroaliphatic group-containing copolymer (2), two or more polymer units of the fluoroaliphatic group-containing monomer (C) represented by the general formula (3) may be contained as structural units.

The fluoroaliphatic group-containing monomer (C) represented by the general formula (3) is preferably a structure represented by the following general formula (3-1).

[Formula 16]

In the general formula (3-1), R ⁴ represents a hydrogen atom or a methyl group, X represents an oxygen atom, a sulfur atom or -N(R ² )-, m is an integer of 1 or more and 6 or less, and n is 1 An integer of 6 or less is shown. R ² represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms which may have a substituent.

The fluoroaliphatic group-containing monomer represented by the general formula (3-1) will be described in detail.

In the general formula (3-1), R ⁴ represents a hydrogen atom, a halogen atom or a methyl group, more preferably a hydrogen atom or a methyl group. X represents an oxygen atom, a sulfur atom or -N(R ² )-, more preferably an oxygen atom or -N(R ² )-, and still more preferably an oxygen atom. R ² represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, still more preferably a hydrogen atom or a methyl group. m represents an integer of 1 or more and 6 or less, 1-3 are more preferable, and it is still more preferable that it is 1. n represents an integer of 1 or more and 6 or less, 4-6 are more preferable, and 6 is still more preferable. In the fluoroaliphatic group-containing copolymer, two or more polymer units of the fluoroaliphatic group-containing monomer represented by the general formula (3-1) may be contained as structural units.

a fluoroaliphatic group-containing monomer (A) represented by the general formula (2) or (2-1), a fluoroaliphatic group-containing monomer (C) represented by the general formula (3) or (3-1); And about the specific example of the fluoro aliphatic group containing copolymer (1) and (2), Unexamined-Japanese-Patent No. 2010-1549434, Unexamined-Japanese-Patent No. 2010-121137, Unexamined-Japanese-Patent No. 2004-331812, and Japan Although the specific example described in Unexamined-Japanese-Patent No. 2004-163610 is mentioned, this invention is not limited to them.

In the present invention, a leveling agent having a repeating unit derived from the fluoroaliphatic group-containing monomer (C) represented by the general formula (3) (fluoroaliphatic group-containing copolymer (2)), and the general formula (2) ) of the leveling agent (fluoroaliphatic group-containing copolymer (1)) having a repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by While being able to suppress, when a low-refractive-index layer is laminated|stacked on a hard-coat layer, favorable abrasion resistance can be acquired.

As the content of the fluoroaliphatic group-containing copolymer, the proportion contained in the total solid content of the fluoroaliphatic group-containing copolymer (1) is 0.01 to 0.2 mass%, and the content of the fluoroaliphatic group-containing copolymer (2) is It is preferable that the ratio contained in total solid is 0.001-0.01 mass %. When content of these copolymers is in the said range, while being able to suppress that a streaks generate|occur|produce on the hard-coat layer surface, when a low-refractive-index layer is laminated|stacked, favorable abrasion resistance can be acquired.

Moreover, in this invention, 1000-50000 are preferable, as for the mass average molecular weight of (d) fluorine-type leveling agent, 5000-50000 are more preferable, 8000-30000 are still more preferable, 10000-20000 are especially preferable. A mass average molecular weight of 1000 or more is preferable at a point with sufficient wind nonuniformity prevention ability. Moreover, 50000 or less of mass average molecular weight are preferable at the point with sufficient solubility and dissolution with respect to an organic solvent. Depending on the prescription to be added, there are cases where the mass average molecular weight is preferably from 1000 to 20000, mainly for suppressing planar failure such as repelling.

Here, the mass average molecular weight and molecular weight are molecular weights expressed in terms of polystyrene by solvent THF and differential refractometer detection by a GPC analyzer using a column of TSKgel GMHxL, TSKgel G4000HxL, and TSKgel G2000HxL (all trade names manufactured by Tosoh Corporation). to be.

The fluorine-based leveling agent of the present invention can be prepared by a known method. For example, a general-purpose radical polymerization initiator is added to the monomers such as (meth)acrylate having a fluoroaliphatic group exemplified above and (meth)acrylate having a linear, branched or cyclic alkyl group in an organic solvent, It can be prepared by polymerization. Alternatively, if necessary, other addition polymerizable unsaturated compounds may be added to prepare in the same manner as above. Depending on the polymerizability of each monomer, a dropping polymerization method in which a monomer and an initiator are added dropwise to a reaction vessel and polymerized are also effective in order to obtain a polymer having a uniform composition.

The amount of polymerized units of these fluoroaliphatic group-containing monomers A constituting the fluoroaliphatic group-containing copolymer (fluorine-based leveling agent) used in the present invention is 10% by mass based on the total polymerized units constituting the fluorine-based leveling agent. It is preferable that it exceeds, It is more preferable that it is 40-95 mass %, It is more preferable that it is 80-95 mass %.

It is preferable that the addition amounts of the said fluoroaliphatic group containing copolymer (1) with respect to the composition for hard-coat layer formation are 0.001 mass % - 1.0 mass %, More preferably, they are 0.01 mass % - 0.2 mass %.

Moreover, the composition for hard-coat layer formation used in this invention may use together leveling agents other than the said leveling agent other than the at least 1 sort(s) of leveling agent chosen from (d) a silicone type leveling agent and a fluorine type leveling agent.

In the present invention, the repeating unit derived from the fluoroaliphatic group-free monomer (B) contained in the fluoroaliphatic group-containing copolymer (1) or (2) has a structure represented by the following general formula [I] It is preferable to have

[Formula 17]

In the general formula [I], R ¹ represents a hydrogen atom, a halogen atom or a methyl group, L ¹ represents a divalent linking group, and Y represents a linear, branched, or cyclic C1-C20 which may have a substituent. represents an aromatic group which may have an alkyl group or a substituent.

The repeating unit derived from the monomer (B) which does not contain a fluoroaliphatic group represented by the said general formula [I] is demonstrated in detail.

As the repeating unit derived from the monomer (B) represented by the general formula [I], those described in Polymer Handbook 2nd ed., J. Brandrup, Wiley lnter science (1975) Chapter 2 Page 1 to 483 can be used.

For example, having one addition polymerizable unsaturated bond selected from acrylic acid, methacrylic acid, acrylic acid esters, methacrylic acid esters, acrylamides, methacrylamides, allyl compounds, vinyl ethers, vinyl esters, etc. a compound etc. are mentioned.

Specifically, the following monomers are mentioned.

Acrylic acid esters:

Methyl acrylate, ethyl acrylate, propyl acrylate, chlorethyl acrylate, 2-hydroxyethyl acrylate, trimethylolpropane monoacrylate, benzyl acrylate, methoxybenzyl acrylate, furfuryl acrylate, tetrahydrofurfuryl acrylate , tert-butyl acrylate, etc.;

Methacrylic acid esters:

Methyl methacrylate, ethyl methacrylate, propyl methacrylate, chlorethyl methacrylate, 2-hydroxyethyl methacrylate, trimethylolpropane monomethacrylate, benzyl methacrylate, methoxybenzyl methacrylate, furfuryl methacrylate, tetrahydrofurfuryl methacrylate, tert-butyl methacrylate, etc.;

Acrylamides:

acrylamide; N-hydroxyethyl-N-methylacrylamide, N-2-acetamideethyl-N-acetylacrylamide, and the like.

Methacrylamides:

Methacrylamide, N-alkylmethacrylamide (Alkyl group having 1 to 3 carbon atoms, for example, methyl group, ethyl group, propyl group), N,N-dialkylmethacrylamide (alkyl group having 1 to 6 carbon atoms) ), N-hydroxyethyl-N-methylmethacrylamide, N-2-acetamideethyl-N-acetylmethacrylamide, and the like.

Allyl Compounds:

Allyl esters (for example, allyl acetate, allyl caproate, allyl caprylate, allyl laurate, allyl palmitate, allyl stearate, allyl benzoate, allyl acetoacetate, allyl lactate, etc.), allyloxyethanol and the like.

Vinyl ethers:

Alkyl vinyl ether (for example, hexyl vinyl ether, octyl vinyl ether, decyl vinyl ether, ethylhexyl vinyl ether, methoxyethyl vinyl ether, ethoxyethyl vinyl ether, chlorethyl vinyl ether, 1-methyl-2,2-dimethyl Propyl vinyl ether, 2-ethylbutyl vinyl ether, hydroxyethyl vinyl ether, diethylene glycol vinyl ether, dimethylaminoethyl vinyl ether, diethylaminoethyl vinyl ether, butylaminoethyl vinyl ether, benzyl vinyl ether, tetrahydrofurfuryl vinyl ether, etc.

Vinyl Esters:

Vinyl butyrate, vinyl isobutylate, vinyl trimethyl acetate, vinyl diethyl acetate, vinyl valate, vinyl caproate, vinyl chlor acetate, vinyl dichlor acetate, vinyl methoxy acetate, vinyl butoxy acetate, vinyl lactate, vinyl -β-phenylbutyrate, vinylcyclohexylcarboxylate, and the like.

Itaconic acid dialkyls:

Dimethyl itaconate, diethyl itaconate, dibutyl itaconate, and the like.

Dialkyl esters or monoalkyl esters of fumaric acid:

dibutyl fumarate and the like.

In addition, crotonic acid, itaconic acid, acrylonitrile, methacrylonitrile, maleylonitrile, styrene and the like.

Among these, in general formula [I], R< ¹ > represents a hydrogen atom, a halogen atom, or a methyl group, and a hydrogen atom and a methyl group are more preferable. L ¹ represents a divalent linking group, Y represents a linear, branched, or cyclic alkyl group having 1 to 20 carbon atoms which may have a substituent, or an aromatic group which may have a substituent. L ¹ represents a divalent linking group containing any of an oxygen atom, a nitrogen atom, and a sulfur atom, -COO-, -COO(R ⁵ )-, -COS-, -COS(R ⁵ )-, -CON( R ⁶ )-, -CON(R ⁵ )(R ⁶ )-, etc. are preferable. Here, R ⁵ represents an alkyl group having 1 or more and 8 or less carbon atoms, R ⁶ represents a hydrogen atom or an alkyl group having 1 or more and 8 or less carbon atoms. It is preferable that Y is a C1-C20 linear, branched, or cyclic alkyl group which may have a substituent, or an aromatic group which may have a substituent.

As a more specific monomer of the monomer represented by general formula [I] of this invention, although the monomer of Unexamined-Japanese-Patent No. 2007-102206 can be used preferably, it is not limited to this.

<The solvent whose surface tension at 20 degreeC is less than 23 mN/m>

Although the composition for hard-coat layer formation used in this invention contains methanol as a solvent, when it contains abundantly the solvent with low surface tension containing methanol as above-mentioned, the drying nonuniformity at the time of hard-coat layer drying. The difference in surface tension between the dry and non-dried portions is increased due to , and wind unevenness or streaks may occur. Therefore, it is necessary to appropriately control the total content of the methanol content and the low surface tension solvent.

Examples of the solvent having a surface tension at 20°C of less than 23 mN/m include methanol, ethanol, isopropyl alcohol (IPA), t-butanol, and hydrocarbons such as n-hexane, n-heptane, and n-octane. can be heard When content of the solvent whose surface tension is less than 23 mN/m is in the said range, generation|occurrence|production of wind nonuniformity and streaks at the time of hard-coat layer drying can also be prevented.

It is preferable that it is 10-25 mass % in total amount, and, as for content of the solvent whose surface tension in 20 degreeC is less than 23 mN/m, it is more preferable that it is 15-20 mass %.

Moreover, it is preferable that the surface tension in 20 degreeC is 23 mN/m or more, and the composition for hard-coat layer formation in this invention contains the solvent which does not melt|dissolve a cellulose acylate.

When the amount of the component in the composition for forming a hard coat layer permeates to the cellulose acylate film base material is large, the pencil hardness of the optical film decreases, and when it is small, interference unevenness may occur, but in the present invention, the surface tension is 23 By limiting the content of the solvent that is less than mN/m to 30 mass% or less, the surface tension is 23 mN/m or more, and using a solvent that dissolves cellulose acylate and a solvent that does not dissolve cellulose acylate in combination, The amount can be optimally adjusted.

As a solvent that has a surface tension of 23 mN/m or more and does not dissolve cellulose acylate, alcohols such as n-butanol, isobutanol, diacetone alcohol and methoxypropanol, toluene, xylene, cyclohexylbenzene, etc. and some ketones such as aromatic hydrocarbons, methyl isobutyl ketone (MIBK) and methyl butyl ketone, cyclohexane, and propylene glycol monomethyl ether acetate.

[Photoinitiator]

The composition for hard-coat layers used in this invention can contain a photoinitiator.

Examples of the photopolymerization initiator include acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds, peroxides, 2,3-dialkyldione compounds, disulfide compounds, fluoroamine compounds, aromatic sulfoniums, ropin dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, coumarins, and the like. Specific examples, preferred aspects, and commercial products of the photopolymerization initiator are described in paragraphs [0133] to [0151] of JP2009-098658A, and can be preferably used in the same manner in the present invention.

「The latest UV curing technology」 {Technical Information Association Co., Ltd.} (1991), p.159, and 「Ultraviolet Curing System」 Kiyomi Kato (1989, published by the General Technology Center), p.65-148 Examples are described and useful in the present invention.

Content of the photoinitiator in the composition for hard-coat layers in this invention is large enough for superposing|polymerizing the polymerizable compound contained in the composition for hard-coat layers, and from the reason of setting it to a small enough quantity so that a starting point does not increase too much. , 0.5-8 mass % is preferable with respect to the total solid in the composition for hard-coat layers, and 1-5 mass % is more preferable.

In the present invention, inorganic fine particles can also be used for the purpose of imparting high hardness or adjusting the refractive index. Moreover, in order to provide antistatic property, a well-known electroconductive compound and electroconductive inorganic fine particle can also be used. The conductive compound is preferably an organic compound such as a compound having a quaternary ammonium base or a conductive polymer having a ?-conjugated structure, and specifically, the conductive organic compound described in JP 2012-73544 A is preferably used.

<Optical Film>

The optical film of this invention can be obtained by apply|coating, drying, and hardening the said composition for hard-coat layer formation on a cellulose acylate film (support body).

Although the example of the preferable laminated constitution of the optical film manufactured by this invention is shown below, it is not limited especially only to these laminated constitutions.

・Support/hard coat layer

・Support/hard coat layer/low refractive index layer

・Support/hard coat layer/glare-proof layer (antistatic layer)/low refractive index layer

・Support body/hard coat layer/glare-proof layer/antistatic layer/low refractive index layer

・Support body/hard coat layer/antistatic layer/glare-proof layer/low refractive index layer

・Support/hard coat layer (antistatic layer)/anti-glare layer/low refractive index layer

・Support body / hard coat layer / high refractive index layer / antistatic layer / low refractive index layer

・Support/hard coat layer/high refractive index layer (antistatic layer)/low refractive index layer

・Support body / hard coat layer / antistatic layer / high refractive index layer / low refractive index layer

・Support / hard coat layer / medium refractive index layer / high refractive index layer (antistatic layer) / low refractive index layer

・Support/hard coat layer/medium refractive index layer (antistatic layer)/high refractive index layer/low refractive index layer

・Support/hard coat layer (antistatic layer)/medium refractive index layer/high refractive index layer/low refractive index layer

・Antistatic layer / support / hard coat layer / medium refractive index layer / high refractive index layer / low refractive index layer

Here, the antistatic layer and the glare-proof layer may have hard-coat property.

[Low refractive index layer]

In this invention, a low-refractive-index layer can also be formed on a hard-coat layer for the purpose of provision of a reflectance reduction effect.

The refractive index of the low-refractive-index layer is lower than the refractive index of the layer immediately below it, preferably from 1.20 to 1.55, more preferably from 1.25 to 1.46, and particularly preferably from 1.30 to 1.40. It is preferable that it is 50-200 nm, and, as for the thickness of a low-refractive-index layer, it is more preferable that it is 70-150 nm, It is most preferable that it is 80-110 nm. It is preferable to obtain a low-refractive-index layer by hardening|curing the curable composition for low-refractive-index layer formation.

As an aspect of the curable composition of a preferable low-refractive-index layer,

(1) a composition containing a fluorine-containing compound having a crosslinkable or polymerizable functional group;

(2) a composition containing as a main component a hydrolysis-condensation product of a fluorine-containing organosilane material;

(3) A composition containing a monomer having two or more ethylenically unsaturated groups and inorganic fine particles (especially, inorganic fine particles having a hollow structure are preferred), etc. are mentioned.

Also in (1) and (2), it is preferable to contain inorganic fine particles, and if inorganic fine particles having a hollow structure with a low refractive index are used, it is particularly preferable from the viewpoint of lowering the refractive index and adjusting the amount and refractive index of the inorganic fine particles. .

(1) Fluorine-containing compound having a crosslinkable or polymerizable functional group

Examples of the fluorine-containing compound having a crosslinkable or polymerizable functional group include a copolymer of a fluorinated monomer and a monomer having a crosslinkable or polymerizable functional group. Specific examples of these fluorinated polymers are described in Japanese Patent Application Laid-Open Nos. 2003-222702, 2003-183322, and 2008-169364.

About the said polymer, as described in Unexamined-Japanese-Patent No. 2000-17028, you may use together the hardening|curing agent which has a polymerizable unsaturated group suitably. In addition, as described in Japanese Patent Application Laid-Open No. 2002-145952, Japanese Patent Application Laid-Open No. 2013-130865, and Japanese Patent Application Laid-Open No. 2006-291077, combination with a fluorine-containing compound having a polyfunctional polymerizable unsaturated group is also preferable. As an example of the compound which has a polyfunctional polymerizable unsaturated group, the monomer which has two or more ethylenically unsaturated groups demonstrated as curable resin compound of the said hard-coat layer is mentioned. Moreover, the hydrolysis-condensation product of the organosilane described in Unexamined-Japanese-Patent No. 2004-17901 is also preferable, and especially the hydrolysis-condensation product of the organosilane containing a (meth)acryloyl group is preferable. These compounds are preferable because the combined effect with respect to abrasion resistance improvement is large, especially when the compound which has a polymerizable unsaturated group is used for a polymer body.

When polymer itself does not have sufficient sclerosis|hardenability independently, necessary sclerosis|hardenability can be provided by mix|blending a crosslinkable compound. For example, when a polymer body contains a hydroxyl group, it is preferable to use various amino compounds as a hardening|curing agent. The amino compound used as the crosslinkable compound is, for example, a compound containing two or more of either one or both of a hydroxyalkylamino group and an alkoxyalkylamino group in total, and specifically, for example, a melamine-based compound; A urea-type compound, a benzoguanamine-type compound, a glycoluril-type compound, etc. are mentioned. It is preferable to use an organic acid or its salt for hardening of these compounds.

(2) Composition containing as a main component a hydrolysis-condensation product of a fluorine-containing organosilane material

A composition containing, as a main component, a hydrolysis-condensation product of a fluorine-containing organosilane compound is also preferable because the refractive index is low and the hardness of the coating film surface is high. A condensate of a compound containing a hydrolyzable silanol at one or both ends of the fluorinated alkyl group and tetraalkoxysilane is preferable. Specific compositions are described in Japanese Patent Application Laid-Open No. 2002-265866 and Japanese Patent No. 317152.

(3) A composition comprising a monomer having two or more ethylenically unsaturated groups and inorganic fine particles having a hollow structure

As another preferred embodiment, a low-refractive-index layer comprising particles of low-refractive index and a binder is mentioned. Although organic or inorganic may be sufficient as low refractive index particle|grains, the particle|grains which have voids inside are preferable. Specific examples of hollow particles are described in silica-based particles described in Japanese Patent Application Laid-Open No. 2002-79616. 1.15-1.40 are preferable and, as for particle|grain refractive index, 1.20-1.30 are more preferable. As a binder, the monomer which has two or more ethylenically unsaturated groups described in the page of the said hard-coat layer is mentioned.

It is preferable to add the radical photopolymerization initiator or thermal radical polymerization initiator mentioned above to the composition for low-refractive-index layers used for this invention. When it contains a radically polymerizable compound, it is 1-10 mass parts with respect to the said compound, Preferably 1-5 mass parts of polymerization initiators can be used.

Inorganic microparticles|fine-particles can be used together for the low-refractive-index layer used for this invention. In order to impart scratch resistance, fine particles having a particle size of 15% to 150%, preferably 30% to 100%, more preferably 45% to 70% of the thickness of the low-refractive-index layer can be used. It is preferable that the inorganic fine particles have a low refractive index. Specifically, silica is preferable, and a hollow structure is more preferable.

To the low refractive index layer of the present invention, for the purpose of imparting properties such as antifouling property, water resistance, chemical resistance, and sliding property, a known silicone-based or fluorine-based antifouling agent, slipping agent, or the like can be appropriately added.

Specific examples of the silicone-based or fluorine-based antifouling agent include those having an ionizing radiation curing group among the above-described fluorine-based or silicone-based leveling agents, but are not limited thereto.

It is preferable that these antifouling agents are added in the range of 0.1-10 mass % of the total solid of a low-refractive-index layer, More preferably, it is 1-5 mass %.

[Applying method]

Although each layer of the optical film of this invention can be formed by the following application|coating method, it is not restrict|limited to this method. A dip coat method, an air knife coat method, a curtain coat method, a roller coat method, a wire bar coat method, a gravure coat method, a slide coat method, or an extrusion coat method (die coat method) (Japanese Patent Application Laid-Open No. 2003-164788) Reference), a known method such as a micro gravure coating method is used, and among these, a micro gravure coating method and a die coating method are preferable.

(dry, curing conditions)

The drying and hardening methods in the case of layer-forming the hard-coat layer etc. in this invention by application|coating are described below.

Curing can be performed by irradiating an ionizing radiation. There is no restriction|limiting in particular about the kind of ionizing radiation, Although X-ray, an electron beam, an ultraviolet-ray, visible light, infrared rays, etc. are mentioned, An ultraviolet-ray is widely used. For example, if a coating film is ultraviolet curable, it is preferable to irradiate the ultraviolet-ray of the irradiation amount of 10 mJ/cm<2> - 1000 mJ/cm<2> with an ultraviolet lamp to harden each layer. In the case of irradiation, the said energy may be applied at once, or it may be divided and irradiated. In particular, from the viewpoint of reducing the performance variation within the plane of the coating film and improving curl, it is preferable to divide and irradiate twice or more, and initially, ultraviolet light with a low irradiation dose of 150 mJ/cm 2 or less After irradiating, it is preferable to irradiate the ultraviolet light of a high irradiation dose of 50 mJ/cm<2> or more after that, and to expose a high irradiation dose to a later stage than an initial stage again.

The oxygen concentration at the time of curing is preferably 0 to 1%, more preferably 0 to 0.1%, and most preferably 0 to 0.01%. By making the oxygen concentration at the time of hardening smaller than 1 %, it becomes less susceptible to the influence of hardening inhibition by oxygen, and it becomes a strong film|membrane.

When forming a plurality of layers (for example, forming a low-refractive-index layer on the hard coat layer), in order to achieve interfacial adhesion between the lower layer and the upper layer, it is preferable to perform a half cure at the time of curing the lower layer. In that case, it may be preferable to harden|cure with an oxygen concentration of 1 % or more.

In this invention, it is preferable to harden|cure by combining irradiation with an ionizing radiation, and heat processing before irradiation, simultaneous with irradiation, or after irradiation.

Although the pattern of some manufacturing processes is shown below, it is not limited to these. (The "-" below indicates that heat treatment is not performed.)

Before Irradiation → Simultaneously with Irradiation → After Irradiation

(1) heat treatment → heat treatment → -

(2) heat treatment → heat treatment → heat treatment

(3) - → heat treatment → heat treatment

(4) - → heat treatment → -

In the present invention, as described above, it is preferable to perform heat treatment in combination with irradiation with ionizing radiation. Although there is no restriction|limiting in particular as long as a heat processing does not inhibit the support body of a hard-coat film, and the structural layer containing a hard-coat layer, Preferably it is 40-150 degreeC, More preferably, it is 40-80 degreeC.

The time required for the heat treatment varies depending on the molecular weight of the component to be used, interaction with other components, viscosity, etc., but is from 1 second to 1 hour, preferably from 1 second to 30 minutes, and most preferably from 1 second to 5 is a minute

[Method for producing cellulose acylate film]

The manufacturing method of the cellulose acylate film used in this invention is demonstrated.

The film containing a cellulose acylate can be formed into a film using the solution cast film forming method or the melt film forming method. Hereinafter, as an example, the case of the solution film forming method will be described.

(Polymer solution)

In the solution casting film forming method, a web is formed using the said cellulose acylate and the polymer solution (cellulose acylate solution) containing various additives as needed. Below, the polymer solution (Hereinafter, it may call a cellulose acylate solution suitably) in this invention which can be used for the solution casting film forming method is demonstrated.

As a main solvent of the polymer solution in this invention, the organic solvent which is a positive solvent of cellulose acylate can be used preferably. As such an organic solvent, the organic solvent whose boiling point is 80 degrees C or less is more preferable from a viewpoint of reducing drying load. As for the boiling point of the said organic solvent, it is more preferable that it is 10-80 degreeC, and it is especially preferable that it is 20-60 degreeC. In some cases, an organic solvent having a boiling point of 30 to 45°C can also be preferably used as the main solvent. In the present invention, among the solvent groups described later, halogenated hydrocarbons can be preferably used as the main solvent, and among halogenated hydrocarbons, chlorinated hydrocarbons are preferable, dichloromethane and chloroform are more preferable, and dichloromethane is most preferable. In addition, in the initial stage of the drying process, a solvent containing 1 to 15 mass% of a solvent having a small volatilization rate with halogenated hydrocarbons and a gradually concentrated boiling point of 95°C or higher relative to the total solvent can be used, and containing 1 to 10 mass% It is preferable to use the solvent to do, and it is more preferable to use the solvent which contains 1.5-8 mass %. And it is preferable that the solvent whose boiling point is 95 degreeC or more is a poor solvent of a cellulose acylate. Specific examples of the solvent having a boiling point of 95°C or higher include solvents having a boiling point of 95°C or higher among specific examples of the “organic solvent used in combination with the main solvent” described later. Among them, butanol, pentanol, 1,4-di Preference is given to using oxane. Moreover, the solvent of the polymer solution in this invention used for this invention contains 5-40 mass % of alcohol, It is preferable to contain 10-30 mass %, It is more preferable to contain 12-25 mass %, It is more preferable to contain 15-25 mass %. Specific examples of the alcohol to be used herein include solvents exemplified as alcohols in the “organic solvent used in combination with the main solvent” described later. Among them, methanol, ethanol, propanol, and butanol are preferably used. In addition, when said "solvent with a boiling point of 95 degreeC or more" is alcohol, such as a butanol, the content is also counted as alcohol content here. By using such a solvent, since the mechanical strength in the heat processing temperature of the manufactured cellulose acylate film can be raised, it can extend|stretch more than necessary during heat processing, and it can prevent that the obtained film becomes easy to crack.

As such a main solvent, a halogenated hydrocarbon is particularly preferable, and depending on the case, esters, ketones, ethers, alcohols, hydrocarbons, etc. may be mentioned, and these may have a branched structure or a cyclic structure. Moreover, the said main solvent may have any two or more of the functional groups of ester, ketone, ether, and alcohol (ie, -O-, -CO-, -COO-, -OH). In addition, the hydrogen atom in the hydrocarbon part of the said ester, ketone, ether, and alcohol may be substituted by the halogen atom (particularly, a fluorine atom). In addition, when it consists of a single solvent, the main solvent of the polymer solution in this invention used for manufacture of the cellulose acylate film used for the manufacturing method of this invention refers to the solvent, When it consists of a plurality of solvents, Among the solvents constituting the solvent, the solvent having the highest mass fraction is shown. As a main solvent, a halogenated hydrocarbon is mentioned preferably.

As said halogenated hydrocarbon, chlorinated hydrocarbon is more preferable, For example, dichloromethane, chloroform, etc. are mentioned, Dichloromethane is still more preferable. Examples of the ester include methyl formate, ethyl formate, methyl acetate, and ethyl acetate.

As said ketone, acetone, methyl ethyl ketone, etc. are mentioned, for example. Examples of the ether include diethyl ether, methyl-tert-butyl ether, diisopropyl ether, dimethoxymethane, 1,3-dioxolane, 4-methyldioxolane, tetrahydrofuran, methyltetra. Hydrofuran, 1, 4- dioxane, etc. are mentioned.

As said alcohol, methanol, ethanol, 2-propanol etc. are mentioned, for example.

As said hydrocarbon, n-pentane, cyclohexane, n-hexane, benzene, toluene, etc. are mentioned, for example.

Examples of the organic solvent used in combination with these main solvents include halogenated hydrocarbons, esters, ketones, ethers, alcohols and hydrocarbons, and these may have a branched structure or a cyclic structure. Moreover, as said organic solvent, you may have any two or more of the functional groups (ie, -O-, -CO-, -COO-, -OH) of ester, ketone, ether, and alcohol. In addition, the hydrogen atom in the hydrocarbon part of the said ester, ketone, ether, and alcohol may be substituted by the halogen atom (particularly, a fluorine atom).

As said halogenated hydrocarbon, chlorinated hydrocarbon is more preferable, For example, dichloromethane, chloroform, etc. are mentioned, Dichloromethane is still more preferable.

Examples of the ester include methyl formate, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, and pentyl acetate.

Examples of the ketone include acetone, methyl ethyl ketone, diethyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, and methylcyclohexanone.

Examples of the ether include diethyl ether, methyl-tert-butyl ether, diisopropyl ether, dimethoxymethane, dimethoxyethane, 1,4-dioxane, 1,3-dioxolane, 4- Methyldioxolane, tetrahydrofuran, methyltetrahydrofuran, anisole, phenetol, etc. are mentioned.

Examples of the alcohol include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, tert-butanol, 1-pentanol, 2-methyl-2-butanol, cyclohexanol, 2-fluoroethanol, 2,2,2-trifluoroethanol, 2,2,3,3-tetrafluoro-1-propanol, etc. are mentioned. Preferably it is a C1-C4 alcohol, More preferably, they are methanol, ethanol, or butanol, Most preferably, they are methanol and a butanol.

Examples of the hydrocarbon include n-pentane, cyclohexane, n-hexane, benzene, toluene, and xylene.

As an organic solvent which has said 2 or more types of functional groups, 2-ethoxyethyl acetate, 2-methoxyethanol, 2-butoxyethanol, methylacetoacetate etc. are mentioned, for example.

In the present invention, the polymer constituting the cellulose acylate film contains a hydroxyl group, a hydrogen bondable functional group such as an ester, a ketone, etc., in the total solvent, 5 to 30 mass%, more preferably 7 to 25 mass% %, More preferably, it is preferable from a viewpoint of peeling load reduction from a flexible support body to contain 10-20 mass % of alcohol.

By adjusting alcohol content, it can be made easy to adjust the expressivity of Re and Rth of the cellulose acylate film manufactured by the manufacturing method of this invention. Specifically, by increasing the alcohol content, it becomes possible to set the heat treatment temperature relatively low or to further increase the reach of Re or Rth.

In addition, in the present invention, containing a small amount of water is also effective for increasing the solution viscosity and the film strength of the wet film state at the time of drying, or for increasing the dope strength at the time of casting by the drum method, for example, with respect to the entire solution. You may make it contain 0.1-5 mass %, More preferably, you may make it contain 0.1-3 mass %, and you may make it contain especially 0.2-2 mass %.

About the example of the combination of the organic solvent preferably used as a solvent of the polymer solution in this invention, it is illustrated by Unexamined-Japanese-Patent No. 2009-262551.

In addition, if necessary, a non-halogen-based organic solvent may be used as the main solvent, and the detailed description is described in the Invention Association Publication No. 2001-1745, published on March 15, 2001, the Invention Association.

5-40 mass % is preferable, as for the cellulose acylate density|concentration in the polymer solution in this invention, 10-30 mass % is more preferable, 15-30 mass % is the most preferable.

The concentration of the cellulose acylate may be adjusted to a predetermined concentration in the step of dissolving the cellulose acylate in a solvent. Moreover, after preparing a low-concentration (for example, 4-14 mass %) solution beforehand, you may concentrate by evaporating a solvent, etc. Moreover, you may dilute after preparing a high-concentration solution beforehand. Moreover, the density|concentration of a cellulose acylate can also be reduced by adding an additive.

The timing of adding the additive can be appropriately determined according to the kind of the additive.

(Preparation of polymer solution)

Preparation of the polymer solution in this invention is, for example, Unexamined-Japanese-Patent No. 58-127737, No. 61-106628, Unexamined-Japanese-Patent No. Hei 2-276830, No. 4-259511, No. 5- Building 163301, Building 9-95544, Building 10-45950, Building 10-95854, Building 11-71463, Building 11-302388, Building 11-322946, Building 11-322947, Building 11-323017 , according to the preparation method described in Unexamined-Japanese-Patent No. 2000-53784, 2000-273184, 2000-273239. Specifically, after mixing and stirring a polymer and a solvent to make it swell, cooling, heating, etc. if necessary and dissolving it, this is filtered and the polymer solution in this invention is obtained.

In this invention, in order to improve the solubility with respect to the solvent of a polymer, it is preferable to include the process of cooling and/or heating the mixture of a polymer and a solvent.

When cooling a mixture of a cellulose acylate and a solvent using a halogen-type organic solvent as a solvent, it is preferable to include the process of cooling a mixture to -100-10 degreeC. Moreover, it is preferable that the process of swelling at -10-39 degreeC is included in the process before a cooling process, and the process of heating at 0-39 degreeC is included in the process after cooling.

In the case of heating a mixture of cellulose acylate and a solvent using a halogen-based organic solvent as a solvent, the step of dissolving cellulose acylate in the solvent by one or more methods selected from the following (a) or (b) desirable.

(a) It swells at -10-39 degreeC, and the obtained mixture is warmed to 0-39 degreeC.

(b) The mixture obtained by swelling at -10-39 degreeC is heated at 40-240 degreeC at 0.2-30 Mpa, and the heated mixture is cooled at 0-39 degreeC.

Moreover, when cooling the mixture of a cellulose acylate and a solvent using a non-halogen type organic solvent as a solvent, it is preferable to include the process of cooling a mixture to -100--10 degreeC. Moreover, it is preferable that the process of -10-55 degreeC is included in the process before a cooling process, and the process of heating at 0-57 degreeC is included in the process after cooling.

In the case of heating a mixture of cellulose acylate and solvent using a halogen-based organic solvent as a solvent, the method comprising a step of dissolving cellulose acylate in a solvent by one or more methods selected from the following (c) or (d) desirable.

(c) Swelling at -10 to 55°C, and heating the resulting mixture to 0 to 57°C.

(d) The mixture obtained by swelling at -10-55 degreeC is heated at 40-240 degreeC at 0.2-30 Mpa, and the heated mixture is cooled at 0-57 degreeC.

(The unveiling of the web)

The web in this invention can be formed by the solution casting|flow_spread film forming method using a polymer solution. When implementing the solution casting film forming method, a well-known apparatus can be used according to the conventional method. Specifically, dope (polymer solution) prepared with a dissolver (kiln) is filtered and then stored in a storage kiln once, and bubbles contained in dope are defoamed and finally prepared. The dope is kept warm at 30° C., and is sent from the dope outlet to the pressurized die through a pressurized metering gear pump capable of supplying the liquid with high precision depending on the number of revolutions, for example, and the dope is sent to the pressurized die. slit) uniformly on the metal support of the flexible part running endlessly (dope casting process). Next, the dope film (web) which is dry at the peeling point at which the metal support has been substantially circled is peeled from the metal support, and then, it is conveyed to a drying zone, and drying is completed, conveying by a roll group. About the detail of the casting process of a solution casting film forming method, and a drying process, there exists description also in the 120-146 pages of Unexamined-Japanese-Patent No. 2005-104148, It can apply also to this invention suitably.

A single layer may be sufficient as a cellulose acylate film, and the laminated body of two or more layers may be sufficient as it. When a cellulose acylate film is a laminated body of two or more layers, it is more preferable that it is a two-layer structure or a three-layer structure, and it is preferable that it is a three-layer structure. In the case of a three-layer structure, it is preferable to have one intermediate layer (that is, it is the thickest layer, hereinafter also referred to as a base layer), and a skin layer A and a skin layer B sandwiching the intermediate layer. That is, it is preferable that the cellulose acylate film of this invention has a three-layer structure of skin layer B/middle layer/skin layer A.

The skin layer B is a layer in contact with a metal support (hereinafter, also referred to as a flexible support side layer) to be described later when the cellulose acylate film is prepared by solution film forming, and the skin layer A is a layer of the air interface on the opposite side to the metal support. (hereinafter also referred to as an air layer). In addition, the skin layer A and the skin layer B are collectively called a skin layer.

When manufacturing a laminated body, various general lamination|stacking casting methods, such as a co-spreading method, a successive casting method, and a coating method, can be appropriately selected and used.

In this invention, a metal band or a metal drum can be used as a metal support body used at the time of film forming of a web.

(stretching process)

The manufacturing method of the cellulose acylate film which concerns on this invention includes the process of extending|stretching the whole film containing a cellulose acylate in a specific direction. The cellulose acylate film which concerns on this invention can reduce the thermal expansion coefficient and humidity dimensional change rate of an extending|stretching direction by extending|stretching. Extending|stretching can be performed by selecting from 10 % or more and 40 % or less in the width direction orthogonal to a longitudinal direction (corresponding to the conveyance direction which conveys a film). Moreover, biaxial stretching combined with extending|stretching to the direction (for example, longitudinal direction) which does not coincide with the width direction may be sufficient.

It is preferable that it is 0 to 20 %, and, as for the draw ratio to the width direction, it is more preferable that it is 3 to 15 %. Moreover, 0 to 20 % is preferable and, as for the draw ratio to a longitudinal direction, 5 to 15 % is more preferable.

About the method of extending|stretching without raising the haze of a film, and controlling the anisotropy of an elastic modulus, the extending|stretching method described in Unexamined-Japanese-Patent No. 2007-176164 etc. which extend|stretches under specific conditions, and Japanese Unexamined-Japanese-Patent No. 1 which reduce a haze after raising a haze The extending|stretching method of publication 2009-137289 etc. can be used preferably. Moreover, about the method of extending|stretching in the state which left the solvent in a film, and controlling the anisotropy of an elastic modulus, the extending|stretching method of Unexamined-Japanese-Patent No. 2007-119717 etc. can be used preferably.

In addition, "draw ratio (%)" as used in this specification means what is calculated|required by the following formula regarding the length of the film in an extending|stretching direction.

Stretch ratio (%) = 100 × {(length after stretching) - (length before stretching)}/(length before stretching)

Moreover, although the extending|stretching speed of the web in an extending process is not specifically limited, From a viewpoint of extending|stretching titration (wrinkle, handling, etc.), 1-1000 %/min is preferable, and 1-100 %/min is more preferable. . Extending|stretching may be performed in 1 step|paragraph, and may be implemented in multiple steps. Moreover, you may apply extending|stretching to the direction (transverse direction) orthogonal to a conveyance direction further.

The web which passed through an extending process may be conveyed to a drying zone continuously, and may implement a drying process after an extending process. In the said drying process, a web is dried, clipping both ends with a tenter, or conveying by a roll group.

In the present invention, the dry state (dry, unpasteurized state) means that the residual solvent of the cellulose acylate film is 0.1% or more.

<Polarizer>

The polarizing plate of this invention has a polarizing film and the optical film of this invention of at least 1 sheet, The said optical film is used as a protective film of a polarizing film.

The polarizing plate includes a polarizing plate having a conventionally known general configuration, and the specific configuration of the polarizing plate is not particularly limited, and a known configuration can be adopted. 6 can be adopted. The optical film of this invention can be laminated|stacked on one surface of a general polarizing plate, and it can be set as the pattern retardation film which can be used for the 3D image display system of a polarizing glasses system. The aspect of the polarizing plate is not only a polarizing plate in the form of a film piece cut to a size that can be mounted on a liquid crystal display device as it is, but also in a strip shape, i.e., an aspect produced in a long shape by continuous production, and rolled up into a roll (example For example, a polarizing plate having a roll length of 2500 m or more and 3900 m or more) is also included.

Although the optical film of this invention is used as one protective film of a polarizing plate, and a normal cellulose acetate film may be used for the other protective film, it is manufactured by the solution film forming method for the other protective film, and 10-100 It is preferable to use the cellulose acetate film extended|stretched in the width direction in roll film form by the draw ratio of %.

Moreover, it is also a preferable aspect that the film other than the optical film of this invention among the protective films of 2 sheets of a polarizing film is also an optical compensation film which has an optical compensation layer which consists of an optically anisotropic layer. The optical compensation film (retardation film) can improve the viewing angle characteristic of a liquid crystal display screen. As an optical compensation film, although a well-known thing can be used, The optical compensation film described in Unexamined-Japanese-Patent No. 2001-100042 is preferable at the point of diffusing a viewing angle.

The polarizing film includes an iodine-based polarizing film, a dye-based polarizing film using a dichroic dye, and a polyene-based polarizing film. An iodine-based polarizing film and a dye-based polarizing film are generally manufactured using a polyvinyl alcohol-based film.

As the polarizing film, a known polarizing film or a polarizing film cut from a long polarizing film in which the absorption axis of the polarizing film is neither parallel nor perpendicular to the longitudinal direction may be used. A long polarizing film in which the absorption axis of the polarizing film is neither parallel nor perpendicular to the longitudinal direction is produced by the following method.

That is, it is stretched by applying tension while maintaining both ends of a polymer film such as a polyvinyl alcohol-based film that is continuously supplied by a holding means, and stretched at least 1.1 to 20.0 times in the width direction of the film, the length of the holding device at both ends of the film The film advancing direction is maintained at both ends of the film so that the angle between the advancing direction of the film and the actual stretching direction of the film at the exit of the step of maintaining both ends of the film is inclined at an angle of 20 to 70°, with a difference in the speed of advancing the film within 3%. It can manufacture by the extending|stretching method formed by bending in the made state. In particular, the one inclined by 45° is preferably used from the viewpoint of productivity.

About the extending|stretching method of a polymer film, Paragraph No. 0020 - 0030 of Unexamined-Japanese-Patent No. 2002-86554 have description in detail.

[Image display device]

The optical film or polarizing plate of the present invention can be used for an image display device such as a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), or a cathode tube display device (CRT).

A liquid crystal display device comprising a liquid crystal cell and the optical film or polarizing plate of the present invention arranged on at least one surface of the liquid crystal cell in particular, the liquid crystal display device in which the surface in which the hard coat layer in the optical film of the present invention was formed is disposed on the outermost surface is preferable

Example

In order to demonstrate this invention in detail, although an Example is given and demonstrated below, this invention is not limited to these Examples.

Example 1

(Preparation of cellulose acylate film substrate)

(Acetyl Substitution Degree)

About the acetyl substitution degree of a cellulose acylate, it measured with the following method.

Acetyl substitution degree was measured according to ASTM D-817-91.

(Preparation of cellulose ester solution for air layer)

The following composition was injected|thrown-in to the mixing tank, it stirred, heating, each component was melt|dissolved, and the cellulose-ester solution for air layers was prepared.

Composition of Cellulose Ester Solution for Air Layer

・Cellulose ester (acetyl substitution degree 2.86) 100 parts by mass

- 3 parts by mass of the sugar ester compound of formula (I)

- 1 part by mass of the sugar ester compound of formula (II)

・2.4 parts by mass of ultraviolet absorbent

・Silica particle dispersion (average particle diameter of 16 nm) "AEROSIL R972", manufactured by Nippon Aerosil Co., Ltd. 0.026 parts by mass

· 377 parts by mass of methylene chloride

· Methanol 61 parts by mass

2.6 parts by mass of butanol

Formula (I)

[Formula 18]

Formula (II)

[Formula 19]

UV absorber

[Formula 20]

(Preparation of cellulose ester solution for drum layer)

The following composition was injected|thrown-in to the mixing tank, it stirred, heating, each component was melt|dissolved, and the cellulose-ester solution for drum layers was prepared.

Composition of Cellulose Ester Solution for Drum Layer

・Cellulose ester (acetyl substitution degree 2.86) 100 parts by mass

- 3 parts by mass of the sugar ester compound of formula (I)

- 1 part by mass of the sugar ester compound of formula (II)

2.4 parts by weight of UV absorbent

・Silica particle dispersion (average particle size of 16 nm) "AEROSIL R972", manufactured by Nippon Aerosil Co., Ltd. 0.091 parts by mass

339 parts by mass of methylene chloride

74 parts by mass of methanol

3 parts by mass of butanol

(Preparation of cellulose ester solution for core layer)

The following composition was injected|thrown-in to the mixing tank, it stirred, heating, each component was melt|dissolved, and the cellulose-ester solution for core layers was prepared.

Composition of Cellulose Ester Solution for Core Layer

・Cellulose ester (acetyl substitution degree 2.86) 100 parts by mass

8.3 parts by mass of the sugar ester compound of formula (I)

2.8 parts by mass of the sugar ester compound of formula (II)

2.4 parts by weight of UV absorbent

· 266 parts by mass of methylene chloride

· Methanol 58 parts by mass

2.6 parts by mass of butanol

(Unveiling by public performance)

As the casting die, an apparatus equipped with a feed block adjusted for co-spreading and capable of forming a film having a three-layer structure was used. The cellulose ester solution for the air layer, the cellulose ester solution for the core layer, and the cellulose ester solution for the drum layer were co-cast on a drum cooled to -7°C from a casting hole. At this time, the flow volume of each dope was adjusted so that thickness ratio might become air layer/core layer/drum layer=7/90/3.

It was cast on a mirror surface stainless steel support which is a drum with a diameter of 3 m. Dry air at 34° C. was blown on the drum at 300 m 3 /min.

And after peeling off the cellulose-ester film which cast and rotated 50 cm from the end point of a flexible part from a drum, both ends were hold|gripped with a pin tenter. At the time of peeling, 8% of extending|stretching was implemented in the conveyance direction (longitudinal direction).

The cellulose-ester web held by the pin tenter was conveyed to the drying zone. In the first drying, a drying wind at 45°C was blown, followed by drying at 110°C for 5 minutes. At this time, the cellulose-ester web was conveyed, extending|stretching to 10 % of magnification in the width direction.

After the web was detached from the pin tenter, portions held by the pin tenter were continuously cut off, and irregularities having a width of 15 mm and a height of 10 µm were provided to both ends of the web in the width direction. The width of the web at this time was 1610 mm. It dried at 140 degreeC for 10 minutes, applying the tension of 130N in the conveyance direction. Furthermore, the width direction edge part was cut off continuously so that a web might become a desired width, and the base material 1 with a film thickness of 60 micrometers was manufactured. At this time, the film thickness of the width direction edge part cut off after 140 degreeC drying and the web center part was the same.

Base 2 was prepared in the same manner as in the preparation of Base 1, except that the sugar ester compound of Formula (I) and the sugar ester compound of Formula (II) were both substituted with A-3 (number average molecular weight 1000) of Table 5 did.

Base 3 was prepared in the same manner as in the preparation of Base 1, except that the sugar ester compound of Formula (I) and the sugar ester compound of Formula (II) were both substituted with A-35 (number average molecular weight 800) in Table 5. did.

In the preparation of Base 1, the same procedure was followed except that the sugar ester compound of Formula (I) and the sugar ester compound of Formula (II) were substituted with A-37 (number average molecular weight 700) in Table 5 to prepare Base 4 did.

In the preparation of Base 1, the same procedure was followed except that the sugar ester compound of Formula (I) and the sugar ester compound of Formula (II) were substituted with A-38 (number average molecular weight 1000) in Table 5 to prepare Base 5 did.

(Preparation of the composition for hard-coat layer formation)

In the composition of the coating liquid B-1 for a hard coat layer shown in Table 6 below, each component is added so that the solid content concentration is 58 mass%, the obtained composition is put into a mixing tank and stirred, and a polypropylene filter having a pore diameter of 0.4 µm was filtered to obtain a hard coat layer coating liquid B-1.

In the same manner as in the coating liquid B-1 for the hard coat layer, each component was mixed as shown in Table 6 below and dissolved in a solvent to prepare the coating liquids B-2 to B-24 for the hard coat layer (a numerical value indicates mass%) .

The compounds each used are shown below.

A-TMMT: Pentaerythritol tetraacrylate (Shin-Nakamura Chemical Industry Co., Ltd. NK Ester)

AD-TMP: Ditrimethylolpropanetetraacrylate (Shin-Nakamura Chemical Industry Co., Ltd. NK Ester)

Irg.127: Photoinitiator, Irgacure 127 (manufactured by Chiba Japan Co., Ltd.)

FP-1: Fluorine-based leveling agent represented by the following formula

(Ratio of the following repeating units is a mass ratio)

[Formula 21]

FP-2: Fluorine-based leveling agent represented by the following formula

(Ratio of the following repeating units is a mass ratio)

[Formula 22]

TSF4460: Silicone-based leveling agent (manufactured by Momentive Performance Materials Japan)

Ion conductive compound AS-1

A quaternary ammonium salt having an ethylene oxide chain as a compound corresponding to (A-6) in the above patent document, in the same manner as in Synthesis Example 6 of Japanese Patent No. 4678451 except that the reaction time was changed to 70° C. for 6 hours. AS-1, which is a group-containing polymer, was synthesized (weight average molecular weight measured by GPC: about 60,000).

MFG: propylene glycol monomethyl ether

(Formation of application of hard coat layer)

On the air side side of the base material 1, the said coating liquid B-1 for hard-coat layers was apply|coated using the die coater. After drying at 60° C. for about 1 minute, using an air-cooled metal halide lamp of 160 W/cm (manufactured by Eye Graphics Co., Ltd.) while purging with nitrogen so that the oxygen concentration becomes an atmosphere of 0.01 vol% or less, the illuminance is 200 mW/cm 2 , the coating layer was cured by irradiating ultraviolet rays with an irradiation amount of 60 mJ/cm 2 to form an optical film HC1 having a thickness of 11 µm.

Optical films HC2-HC32 were manufactured by the combination of Table 7 using the base materials 1-5 and the coating liquids B-2 to B-24 for hard-coat layers by the same method.

(Evaluation method of optical film)

Various properties of the optical film were evaluated by the following method. A result is shown in Table 7.

(interference non-uniformity)

Oil-based black ink (replenishment magic ink: Terranish Chemicals) was applied to the surface opposite to the side on which the application layer of the support was formed, to prepare a 30 cm x 30 cm sample in which light reflection on the back surface was prevented. In order to make this sample very easy to see the level of interference non-uniformity, external light is blocked in a room with all black surroundings, and a 3-wavelength fluorescent lamp (FL20SS/EX-N/18 (Matsushita Electric Industry Co., Ltd.) is attached to it at an angle) The surface of the sample was irradiated with a stand (a diffuser sheet was attached to the fluorescent lamp to obtain diffused light), and the interference nonuniformity observed at that time was visually evaluated.

A : Even if you look carefully, you cannot tell that there is a non-uniformity.

B: If you look carefully, you can see some unevenness, but I don't care.

C: Weak unevenness is recognized

D: I am concerned because strong unevenness is recognized just by looking at it once.

E: Very strong unevenness is recognized just by looking at it, and I am very concerned.

(wind unevenness)

Oil-based black ink (supplementary magic ink: Terranish Chemicals) was applied to the surface opposite to the side on which the application layer of the support was formed to prepare a 1 m x 0.5 m sample in which light reflection on the back surface was prevented. In order to make this sample very easy to see the level of wind unevenness, external light was blocked in a room with all black surroundings, and a 3-wavelength fluorescent lamp (FL20SS/EX-N/18 (Matsushita Electric Industry Co., Ltd.) was attached to it at an angle). The surface of the sample was irradiated with a stand (a diffuser sheet was not attached to the fluorescent lamp part), and the wind unevenness (surface unevenness) observed at that time was visually evaluated.

A : Even if you look carefully, you cannot tell that there is a non-uniformity.

B: If you look carefully, you can see some unevenness, but I don't care.

C: Weak unevenness is recognized

D: I am concerned because strong unevenness is recognized just by looking at it once.

E: Very strong unevenness is recognized just by looking at it, and I am very concerned.

(stripe)

In order to make the level of a stripe easy to see, it evaluated in a dark room. One optical film was suspended from the top with a white screen as the background, and light was irradiated from the coated surface with S-Light (manufactured by Nippon Technology Center Co., Ltd.) and projected on the screen. The streaks observed at that time were visually evaluated. (Evaluation area: 1 m × 5 m)

A : No streaks are observed even if you look carefully.

B: If you look carefully, 1 or 2 weak streaks are observed, but you do not care.

C: Several weak streaks are observed.

D: A few to 20 strong streaks are observed and I am concerned.

E: More than 20 strong streaks are observed on the entire surface, which is of great concern.

(Steel wool scratch resistance)

It was set as the index|index of abrasion resistance by performing a rubbing test on the following conditions using a rubbing tester.

Evaluation environmental conditions: 25℃, 60%RH

Rubbing material: Steel wool (manufactured by Nippon Steel Wool Co., Ltd., grade No.0000)

The band is fixed by winding it around the rubbing tip (1 cm × 1 cm) of the tester in contact with the sample.

Travel distance (one way): 13 cm,

Rubbing speed: 13 cm/sec;

Load: 500 g/cm2,

Tip contact area: 1 cm × 1 cm;

Number of rubs: 10 round trips.

Oil-based black ink (supplementary magic ink: Terranish Chemicals) was applied to the back of the rubbed sample, and scratches on the rubbed portion were visually observed with reflected light, and evaluated according to the following criteria. For evaluation, the above test was repeated 3 times, and the average was evaluated in 5 steps.

A : Even if you look very carefully, there are no scratches at all.

B: There are a few scratches, but you can't tell unless you look carefully.

C: Several to tens of scratches are seen.

D: There are so many flaws that I can't even count them, so I can tell just by looking at them.

(pencil hardness)

Pencil hardness evaluation of JISK5400 was implemented. After the optical film was controlled at a temperature of 25°C and a humidity of 60%RH for 2 hours, it was evaluated using a test pencil prescribed in JIS S6006. As hard-coat performance, it is preferable that hardness is 3H or more.

As shown in the table above,

(a) polyfunctional (meth)acrylate compound

(b) methanol

(c) a solvent for dissolving cellulose acylate

(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent

(1): (b) content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation,

(2): (c) content of the solvent which melt|dissolves cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation,

(3): The composition for hard-coat layer formation containing 10-30 mass % of total amounts of the solvent whose surface tension in 20 degreeC is less than 23 mN/m with respect to the total mass of the solvent in the composition for hard-coat layer formation The optical film obtained by application|coating did not have an interference nonuniformity, a wind nonuniformity, and a stripe, and the favorable surface image was obtained.

Example 2

In the same manner as in the coating liquid B-1 for the hard coat layer, each component was mixed as shown in Table 8 below and dissolved in a solvent to prepare the coating liquids B-25 to B-29 for the hard coat layer (a numerical value indicates mass%) .

(Preparation of coating liquid for low refractive index layer)

Each component was mixed as follows, and after adding so that propylene glycol monomethyl ether acetate might become 20 mass % in all the solvents, it diluted with methyl ethyl ketone, and solid content concentration was finally set to 5 mass %. It poured into the glass separable flask with a stirrer, and after stirring at room temperature for 1 hour, it filtered with the depth filter made from a polypropylene with a pore diameter of 0.5 micrometer, and each coating liquid for low-refractive-index layers was obtained.

Coating solution for low refractive index layer C-1

P-1 (solid content 15.2 mass%) 157.9 mass parts

F-1 (solid content 100% by mass) 25.0 parts by mass

PET-30 (solid content 100% by mass) 5.0 parts by mass

Sullia 4320 (solid content 20.5 mass%) 170.7 mass parts

MEK-ST-L (30 mass% solid content) 16.7 mass parts

Irg.127 (solid content 100% by mass) 3.0 parts by mass

Rad2600 (solid content 100% by mass) 1.5 parts by mass

Rad2500 (solid content 100% by mass) 0.5 parts by mass

FM-0725 (solid content 100% by mass) 1.0 parts by mass

Coating solution for low refractive index layer C-2

DPHA (solid content 100% by mass) 51.0 parts by mass

Sullia 2320 (20.5 mass % solid) 215.0 parts by mass

Irg.127 (solid content 100% by mass) 3.0 parts by mass

X22-164C (solid content 100% by mass) 2.0 parts by mass

The compounds each used are shown below.

P-1: Fluorinated polymer A having an ethylenically unsaturated group described in Examples of Japanese Patent Application Laid-Open No. 2013-130865

F-1: the following fluorine-containing polyfunctional acrylate compound

[Formula 23]

PET-30: mixture of pentaerythritol triacrylate and pentaerythritol tetraacrylate (manufactured by Nippon Kayaku Co., Ltd.)

DPHA: mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate (manufactured by Nippon Kayaku Co., Ltd.)

Sullia 2320: dispersion of hollow silica fine particles (manufactured by Nikki Catalyst Chemical Co., Ltd.)

Sullia 4320: Dispersion of hollow silica fine particles (manufactured by Nikki Catalyst Chemical Co., Ltd.)

MEK-ST-L: Colloidal silica fine particles (manufactured by Nissan Chemical Industry Co., Ltd.)

Rad2600: silicone-modified acrylate (manufactured by EVONIK, number average molecular weight: 16,000)

Rad2500: silicone-modified acrylate (manufactured by EVONIK, number average molecular weight: 1,500)

FM-0725: silicone compound, silaplane FM-0725 (manufactured by Chisso, number average molecular weight: 10,000)

X22-164C: silicone compound (manufactured by Shin-Etsu Chemical Co., Ltd.)

(Formation of application of hard coat layer)

An optical film was prepared on the substrate 1 by using the coating liquid B-25 for the hard coat layer in the same manner as for the optical film HC1.

(Formation of coating of low refractive index layer)

On the said optical film, the composition C-1 for low-refractive-index layer formation was apply|coated using the die coater, and the optical film sample Ln1 was obtained. Drying conditions were 60° C. for 60 seconds, and UV curing conditions were irradiance 600 mW/cm 2 using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) while purging with nitrogen so that the oxygen concentration became an atmosphere of 0.01 vol% or less. It was set as the irradiation amount of 300 mJ/cm<2> of irradiation amount. The film thickness of the low refractive index layer was 95 nm.

Except having used the base material, the coating liquid for hard-coat layer formation, and the coating liquid for low-refractive-index layer formation by the combination shown in Table 9, it carried out similarly to optical film Ln1, and obtained optical film samples Ln2-7, respectively.

Various properties of the optical film were evaluated by the method described in Example 1. A result is shown in Table 9.

As shown in Table 9, when two types of fluorine-based leveling agents are used together as a leveling agent, not only interference unevenness, wind unevenness, and streaks are good, but also good scratch resistance even when a low refractive index layer is laminated on the hard coat layer was obtained

Example 3

In the same manner as in the coating liquid B-1 for the hard coat layer, each component was mixed as shown in Table 10 below and dissolved in a solvent to prepare the coating liquids B-30 to B-34 for the hard coat layer (the numerical values indicate mass%). .

(Formation of application of hard coat layer)

Optical film samples HC33-37 were prepared by the combination of Table 11 using the coating liquids B-30-B-34 for hard-coat layer on the base material 1 by the method similar to optical film HC1.

Various properties of the optical film were evaluated by the method described in Example 1. A result is shown in Table 11.

As shown in Table 11, the content of the solvent having a surface tension of less than 23 mN/m is limited to 30% by mass or less, a solvent having a surface tension of 23 mN/m or more and dissolving cellulose acylate, and cellulose acylate By using combining the solvent which does not melt|dissolve, the amount of permeation can be adjusted optimally, and the optical film with favorable interference nonuniformity, wind nonuniformity, and stripe, and also pencil hardness was obtained.

Claims (16)

On a cellulose acylate film base material containing a sugar ester compound having a structure represented by the following general formula (1), the following (a) to (d) are contained, and the following conditions (1) to (3) A method for producing an optical film to form a hard coat layer by applying a composition for forming a hard coat layer that satisfies:
(HO) _m -G-(LR ₁ ) _n general formula (1)
(In the general formula (1), G represents a monosaccharide residue or a disaccharide residue. R ₁ each independently represents an aliphatic group or an aromatic group. L each independently represents a divalent linking group. m is an integer of 0 or more, n is a natural number greater than or equal to 1).
(a) polyfunctional (meth)acrylate compound
(b) methanol
(c) a solvent for dissolving cellulose acylate
(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent
(1): (b) Content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(2): (c) Content of the solvent which melt|dissolves cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(3): 10 mass % - 30 mass % of the solvent whose surface tension in 20 degreeC is less than 23 mN/m is contained in total with respect to the total mass of the solvent in the composition for hard-coat layer formation. On the following (a)-( The manufacturing method of the optical film which contains d) and which apply|coats the composition for hard-coat layer formation which satisfy|fills the conditions of the following (1)-(3), and forms a hard-coat layer.
(a) polyfunctional (meth)acrylate compound
(b) methanol
(c) a solvent for dissolving cellulose acylate
(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent
(1): (b) content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(2): (c) Content of the solvent which melt|dissolves cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(3): 10 mass % - 30 mass % of the solvent whose surface tension in 20 degreeC is less than 23 mN/m is contained in total with respect to the total mass of the solvent in the composition for hard-coat layer formation. 3. The method according to claim 1 or 2,
The manufacturing method of the optical film which satisfy|fills the conditions of the following (4).
(4): (d) Content of the at least 1 sort(s) of leveling agent chosen from a silicone type leveling agent and a fluorine type leveling agent is 0.01-0.5 mass % in the total solid of the coating composition for hard-coat layer formation. 3. The method according to claim 1 or 2,
The manufacturing method of the optical film which satisfy|fills the conditions of the following (5).
(5): (d) Content of the at least 1 sort(s) of leveling agent chosen from a silicone type leveling agent and a fluorine type leveling agent is 0.01-0.04 mass % in the total solid of the coating composition for hard-coat layer formation. 3. The method according to claim 1 or 2,
The manufacturing method of the optical film whose content of the said methanol is 10 mass % - 25 mass % with respect to the total mass of the solvent in the said composition for hard-coat layer formation. 3. The method according to claim 1 or 2,
The manufacturing method of the optical film in which the solvent whose surface tension in 20 degreeC is less than 23 mN/m contains 10 mass % - 25 mass % in total with respect to the total mass of the solvent in the said composition for hard-coat layer formation. 3. The method according to claim 1 or 2,
The said composition for hard-coat layer formation is the manufacturing method of the optical film containing the solvent which surface tension in 20 degreeC is 23 mN/m or more, and does not melt|dissolve a cellulose acylate. 3. The method according to claim 1 or 2,
(d) at least one kind of leveling agent selected from the silicone-based leveling agent and the fluorine-based leveling agent includes at least one repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by the following general formula (2); A method for producing an optical film, which is a fluoroaliphatic group-containing copolymer (1) containing at least one type of repeating units derived from a monomer (B) not containing an aliphatic group:

(In general formula (2), R ₀ represents a hydrogen atom, a halogen atom or a methyl group, L represents a divalent linking group, and n represents an integer of 1 or more and 18 or less). 3. The method according to claim 1 or 2,
(d) at least one kind of leveling agent selected from the silicone-based leveling agent and the fluorine-based leveling agent includes at least one repeating unit derived from the fluoroaliphatic group-containing monomer (C) represented by the following general formula (3); A method for producing an optical film, which is a fluoroaliphatic group-containing copolymer (2) containing at least one type of repeating unit derived from a monomer (B) not containing an aliphatic group:

(In general formula (3), R ₃ represents a hydrogen atom, a halogen atom or a methyl group, L ₂ represents a divalent linking group, and n represents an integer of 1 or more and 6 or less). 3. The method according to claim 1 or 2,
The manufacturing method of the optical film which has the process of further forming a low-refractive-index layer on the said hard-coat layer. 3. The method according to claim 1 or 2,
As a manufacturing method of the optical film which has a process of further forming a low-refractive-index layer on the said hard-coat layer,
(d) at least one kind of leveling agent selected from the silicone-based leveling agent and the fluorine-based leveling agent includes at least one repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by the following general formula (2); A fluoroaliphatic group-containing copolymer (1) containing at least one type of repeating unit derived from a monomer (B) which does not contain an aliphatic group:

(in general formula (2), R ₀ represents a hydrogen atom, a halogen atom or a methyl group, L represents a divalent linking group, and n represents an integer of 1 or more and 18 or less) and
At least one repeating unit derived from the fluoroaliphatic group-containing monomer (C) represented by the following general formula (3) and at least one repeating unit derived from the fluoroaliphatic group-free monomer (B) A method for producing an optical film, comprising the fluoroaliphatic group-containing copolymer (2):

(In general formula (3), R ₃ represents a hydrogen atom, a halogen atom or a methyl group, L ₂ represents a divalent linking group, and n represents an integer of 1 or more and 6 or less). On a cellulose acylate film substrate containing at least one compound selected from a sugar ester compound and a polycondensation ester compound, the following (a) to (d) are contained, and the following (1) to (3) And the manufacturing method of the optical film which has the process of apply|coating the composition for hard-coat layer formation which satisfy|fills the conditions of (6) to form a hard-coat layer, and the process of further forming a low-refractive-index layer on the said hard-coat layer.
(a) polyfunctional (meth)acrylate compound
(b) methanol
(c) a solvent for dissolving cellulose acylate
(d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent
(1): (b) Content of methanol is 10 mass % - 30 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(2): (c) Content of the solvent which melt|dissolves cellulose acylate is 20 mass % - 90 mass % with respect to the total mass of the solvent in the composition for hard-coat layer formation
(3): 10 mass % - 30 mass % of the solvent whose surface tension in 20 degreeC is less than 23 mN/m is contained in total with respect to the total mass of the solvent in the composition for hard-coat layer formation.
(6): (d) at least one leveling agent selected from a silicone-based leveling agent and a fluorine-based leveling agent,
At least one type of repeating unit derived from the fluoroaliphatic group-containing monomer (A) represented by the following general formula (2) and at least one type of repeating unit derived from the monomer (B) not containing a fluoroaliphatic group A fluoroaliphatic group-containing copolymer (1) and
At least one type of repeating unit derived from the fluoroaliphatic group-containing monomer (C) represented by the following general formula (3) and at least one type of repeating unit derived from the fluoroaliphatic group-free monomer (B) Contains a fluoroaliphatic group-containing copolymer (2)

(In general formula (2), R ₀ represents a hydrogen atom, a halogen atom or a methyl group, L represents a divalent coupling group, and n represents an integer of 1 or more and 18 or less).

(In general formula (3), R ₃ represents a hydrogen atom, a halogen atom or a methyl group, L ₂ represents a divalent linking group, and n represents an integer of 1 or more and 6 or less). 13. The method of claim 12,
The proportion contained in the total solid content of the fluoroaliphatic group-containing copolymer (1) is 0.01 to 0.2 mass%, and the proportion contained in the total solid content of the fluoroaliphatic group-containing copolymer (2) is 0.001 to 0.01 mass%. A method for producing an optical film. The manufacturing method of the polarizing plate containing the optical film manufactured by the manufacturing method of the optical film in any one of Claims 1, 2, 12, and 13. The manufacturing method of the image display apparatus containing the optical film manufactured by the manufacturing method of the optical film in any one of Claims 1, 2, 12, and 13. The manufacturing method of the image display apparatus containing the polarizing plate manufactured by the manufacturing method of the polarizing plate of Claim 14.