TW201906903A - Optical film - Google Patents

Abstract

Provided is an optical film excellent in suppression of deterioration caused by visible light with short wavelength in a phase retardation film or an organic EL light-emitting element. The optical film of the present invention is formed of a resin composition containing a resin (A) and a light selective absorption compound (B), wherein the resin (A) is at least one resin selected from a group consisting of cellulose resin, (meth)acrylic resin, polyester resin, polyamide resin, polyimide resin and cycloolefin resin, and the optical film satisfies the following formula (1) A(405) ≥ 0.5 (1) [in formula, A (405) represents the absorbancy at wavelength 405 nm].

Description

   Optical film   

The present invention relates to an optical film.

For display devices (FPD: flat panel displays) such as organic EL display devices and liquid crystal display devices, various components such as display elements such as organic EL elements, liquid crystal cells (also called liquid crystal elements), or optical films such as polarizing plates are used. Since organic EL compounds, liquid crystal compounds, and the like used in these parts are organic substances, they are liable to be deteriorated by ultraviolet rays (UV). In order to solve such a problem, for example, Patent Document 1 describes a polarizing plate in which a UV absorber having excellent ultraviolet absorption ability in a wavelength range of 370 nm or less is added to a protective film of a polarizing plate.

    [Prior technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent Laid-Open No. 2006-308936

In addition, in recent years, the thickness of display devices has been reduced, and the development of liquid crystal-based retardation films made by aligning and photocuring polymerizable liquid crystal compounds is progressing. It is known that such a liquid crystal-based retardation film or an organic EL light-emitting element is not only deteriorated by ultraviolet rays, but also tends to be deteriorated in short-wavelength visible light. However, the polarizing plate described in Patent Document 1 has excellent ultraviolet absorption ability in a wavelength range of 370 nm or less, low visible light absorption performance near 400 nm, and the degradation of a liquid crystal-based retardation film or an organic EL light emitting device may not be sufficiently suppressed. Display devices in recent years require better display characteristics.

The present invention provides an optical film having a good suppression function by suppressing deterioration of a liquid crystal phase retardation film or an organic EL light-emitting element due to short-wavelength visible light by displaying high absorption selectivity for short-wavelength visible light near a wavelength of 405 nm.

The present invention includes the following inventions.

[1] An optical film formed of a resin composition containing a resin (A) and a light-selective absorbing compound (B); characterized in that the resin (A) is made of a cellulose-based resin and (meth) acrylic At least one resin selected from the group consisting of a resin, a polyester resin, a polyamide resin, a polyimide resin, and a cycloolefin resin; the optical film satisfies the following formula (1): A (405 ) ≧ 0.5 (1) [In the formula (1), A (405) represents the absorbance at a wavelength of 405 nm].

[2] The optical film according to [1], which satisfies the following formula (2): A (440) ≦ 0.1 (2) [In formula (2), A (440) represents an absorbance at a wavelength of 440 nm].

[3] The optical film according to [1] or [2], which further satisfies the following formula (3): A (405) / A (440) ≧ 5 (3) [In formula (3), A (405 ) Indicates the absorbance at a wavelength of 405 nm, and A (440) indicates the absorbance at a wavelength of 440 nm].

[4] The optical film according to any one of [1] to [3], wherein the content of the light selective absorption compound (B) is 0.01 to 20 parts by mass based on 100 parts by mass of the resin (A).

[5] The optical film according to any one of [1] to [4], wherein the storage elastic modulus E of the resin (A) at 23 ° C is 100 MPa or more.

[6] The optical film according to any one of [1] to [5], wherein the light selective absorption compound (B) is a compound satisfying the formula (4); ε (405) ≧ 20 (4) [formula (4) ), Ε (405) represents the gram absorption coefficient of the compound having a wavelength of 405 nm; the unit of the gram absorption coefficient is L / (g.cm)].

[7] The optical film according to [6], wherein the light selective absorption compound (B) is a compound satisfying the formula (5); ε (405) / ε (440) ≧ 20 (5) [In the formula (5), ε (405) represents the gram absorption coefficient of a compound having a wavelength of 405 nm; ε (440) represents the gram absorption coefficient of a wavelength of 440 nm].

[8] The optical film according to any one of [1] to [7], wherein the light selective absorption compound (B) is a compound having a merocyanine structure in a molecule.

[9] An adhesive-attached optical film having an adhesive layer on at least one side of the optical film according to any one of [1] to [8].

[10] A display device including the optical film according to [9].

The optical film of the present invention exhibits high absorption selectivity for short-wavelength visible light near a wavelength of 405 nm, and has a good suppression function for deterioration caused by short-wavelength visible light of a liquid crystal-based retardation film or an organic EL light-emitting element. In addition, the optical film of the present invention exhibits high absorption selectivity for short-wavelength visible light near a wavelength of 405 nm even after the weather resistance test, and can suppress deterioration due to short-wavelength visible light even after the weather resistance test. . In the case of a display device using the optical film of the present invention, good display characteristics and durability can be provided.

1‧‧‧ The optical film of the present invention

2‧‧‧ Adhesive layer

3‧‧‧ separator

4‧‧‧ protective film

5, 60‧‧‧ Adhesive layer

6‧‧‧ polarizing film

7, 7a‧‧‧Adhesive layer

8‧‧‧ protective film

10‧‧‧ Optical film with adhesive layer

10A, 10B, 10C, 10D‧‧‧ Optical Laminates

30‧‧‧Light-emitting element

40‧‧‧ Optical Film

50, 50a‧‧‧1 / 4 wavelength retardation layer

70‧‧‧1 / 2 wavelength retardation layer

80‧‧‧ positive C floor

FIG. 1 is a schematic cross-sectional view showing an example of an optical film with an adhesive layer according to the present invention.

Fig. 2 is a schematic cross-sectional view showing an example of a laminated body including the optical film of the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of a laminated body including the optical film of the present invention.

FIG. 4 is a schematic cross-sectional view showing an example of a laminated body including the optical film of the present invention.

Fig. 5 is a schematic cross-sectional view showing an example of a laminated body including the optical film of the present invention.

The optical film of the present invention is an optical film formed of a resin composition containing a resin (A) and a light-selective absorbing compound (B); the resin (A) is made of cellulose resin, (meth) acrylic acid, At least one resin selected from the group consisting of a series resin, a polyester resin, a polyamide resin, a polyimide resin, and a cycloolefin resin; and the optical film satisfies the following formula (1): A (405) ≧ 0.5 (1)

[In formula (1), A (405) represents the absorbance at a wavelength of 405 nm].

The larger the value of A (405), the higher the absorption at a wavelength of 405nm. When the value of A (405) is less than 0.5, the absorption at a wavelength of 405nm is low, which may easily cause deterioration of display devices such as organic EL elements such as ultraviolet rays or retardation films. The value of A (405) is preferably 0.6 or more, more preferably 0.8 or more, and particularly preferably 1.0 or more. The upper limit is not particularly limited, and is usually 10 or less.

The optical film of the present invention preferably satisfies the following formula (2).

A (440) ≦ 0.1 (2) [In the formula (2), A (440) represents an absorbance at a wavelength of 440 nm].

The smaller the value of A (440), the lower the absorption at a wavelength of 440nm. When the value of A (440) exceeds 0.1, the color performance of the display device tends to be impaired. In addition, since the display device is prevented from emitting light, the brightness is also low. The value of A (440) is preferably 0.05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less. The lower limit is not particularly limited, and is usually 0.00001 or more.

The optical film of the present invention preferably satisfies the following formula (3).

A (405) / A (440) ≧ 5 (3)

[In formula (3), A (405) represents an absorbance at a wavelength of 405 nm, and A (440) represents an absorbance at a wavelength of 440 nm].

The value of A (405) / A (440) indicates the magnitude of the absorption at a wavelength of 405 nm. The larger the value is, the greater the value indicates the specific absorption in the wavelength region near the wavelength of 405 nm. The value of A (405) / A (440) is more preferably 10 or more, more preferably 30 or more, and particularly preferably 60 or more.

The 23 ° C storage elastic modulus E 'of the optical film of the present invention is usually 100 MPa or more, more preferably 300 MPa or more, more preferably 500 MPa or more, even more preferably 1000 MPa or more, and particularly preferably 3500 MPa or more. The upper limit is not particularly limited, and it is usually 100,000 MPa or less.

The 23 ° C storage elastic modulus of the optical film of the present invention can be measured by the method described in the examples.

The optical film of the present invention is formed of a resin composition containing a resin (A) and a light-selective absorbing compound (B) (in some cases, referred to as a "resin composition (1)").

The resin (A) is at least one selected from the group consisting of a cellulose resin, a (meth) acrylic resin, a polyester resin, a polyamide resin, a polyimide resin, and a cycloolefin resin. 1 resin.

The cellulose resin is preferably a cellulose ester resin, that is, a resin in which at least a part of hydroxyl groups of cellulose is esterified with acetate, and a part of which is esterified with acetate and a part of which is esterified with other esters. ester. The cellulose ester resin is preferably an ethyl cellulose resin. Specific examples of the ethyl cellulose-based resin include triethyl cellulose, diethyl cellulose, cellulose acetate propionate, cellulose acetate butyrate, and the like.

As raw material cotton of acetyl cellulose, cellulose raw materials such as wood pulp and cotton linters, which are conventional techniques such as 2001-1745 published by the Invention Association, can be used. In addition, ethoxylated cellulose can be synthesized by methods described in Wood Chemistry 180-190 pages (Kyoritsu Publishing, Youtian et al., 1968).

As a commercially available product of triethyl cellulose, there are trade names "UV-50", "UV-80", "SH-80", "TD-80U", and "TD-TAC" manufactured by Fujifilm Corporation. , "UZ-TAC", etc.

Examples of the (meth) acrylic resin include an alkyl methacrylate or a separate polymer of an alkyl acrylate, a copolymer of an alkyl methacrylate and an alkyl acrylate, and the like. Specific examples of the alkyl methacrylate include methyl methacrylate, ethyl methacrylate, and propyl methacrylate. Specific examples of the alkyl acrylate include methyl acrylate and ethyl acrylate. Esters, propyl acrylate, etc. As such a (meth) acrylic resin, a commercially available (meth) acrylic resin can also be used. As the (meth) acrylic resin, a (meth) acrylic resin called impact resistance can be used.

Further, as specific examples of the (meth) acrylic resin, "Acrypet VH" and "Acrypet VRL20A" of Mitsubishi Rayon Corporation can also be cited.

A polyester resin-based polymer resin having an ester-bonded repeating unit in its main chain is generally obtained by polycondensation of a polycarboxylic acid or a derivative thereof with a polyhydric alcohol or a derivative thereof.

Examples of the polycarboxylic acid or a derivative thereof obtained from the polyester include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, and diphenylarsinedicarboxylic acid. Aromatic dicarboxylic acids such as acids, diphenoxyethanedicarboxylic acid, 5-sodium dicarboxylic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acids, maleic acid, trans Aliphatic dicarboxylic acids such as butenedioic acid, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, hydroxycarboxylic acids such as p-hydroxybenzoic acid, and derivatives thereof. Examples of the dicarboxylic acid derivatives include dimethyl terephthalate, diethyl terephthalate, 2-hydroxyethyl methyl terephthalate, dimethyl 2,6-naphthalene dicarboxylate, and Esters such as dimethyl phthalate, dimethyl adipate, diethyl maleate and dimethyl dimer. Among them, in terms of moldability and operability, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and esterified products thereof are preferably used.

Examples of the polyol or derivative obtained from the polyester include ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, and 1,4-butanediol. , 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol and other aliphatic dihydroxy compounds, diethylene glycol, polyethylene glycol, polypropylene glycol, polybutylene glycol and other polyoxyalkylenes Diols, alicyclic dihydroxy compounds such as 1,4-cyclohexanedimethanol and spirodiol, aromatic dihydroxy compounds such as bisphenol A and bisphenol S, and derivatives thereof. Among them, in terms of moldability and operability, ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, and 1,4-cyclohexanedimethanol are used. ideal.

Examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and polytrimethylene terephthalate. , Polypropylene naphthalate, polycyclohexane dimethyl terephthalate, cyclohexane dimethyl polynaphthalate, and the like. Among these, polyethylene terephthalate or polyethylene naphthalate is preferable.

Polyamine resin-based repeating units include polymer resins with a fluorene bond as a main chain, for example, an aromatic polyamine (polyaramide) having an aromatic ring skeleton bonded by a fluorene bond or an aliphatic skeleton by fluorene. Amine bonds such as aliphatic polyamines. Generally, it can be obtained by a polymerization reaction of a polycarboxylic acid or a derivative thereof and a polyamine.

Examples of the polycarboxylic acid or a derivative thereof obtained from polyamine include p-xylylenedichloride, 2-chloro-p-xylylenedichloromethane, m-xylylenedichloromethane, naphthalenedicarbonyl chloride, and biphenyldiamine. Carbonyl chloride, triphenyl dicarbonyl chloride, etc.

Examples of polyamines to be obtained from polyamines include 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylhydrazone, and 3,3 '-Diaminodiphenylhydrazone, 2,2'-ditrifluoromethyl-4,4'-diaminobiphenyl, 9,9-bis (4-aminophenyl) fluorene, 9,9- Bis (4-amino-3-methylphenyl) fluorene, bis [4- (4-aminophenoxy) phenyl] fluorene, bis [4- (3-aminophenoxy) phenyl] Samarium, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2-bis (4-aminophenyl) hexafluoropropane, etc., and more preferably 4,4'- Diaminodiphenylhydrazone, 3,3'-diaminodiphenylhydrazone, 2,2'-ditrifluoromethyl-4,4'-diaminobiphenyl, 9,9-bis (4-amine Phenyl) fluorene, 9,9-bis (4-amino-3-methylphenyl) fluorene, 1,4-cyclohexanediamine, 1,4-norbornenediamine.

Polyimide resin-based repeating units contain polyimide bonds as the main chain of polymer resins. Generally, diamines and tetracarboxylic dianhydrides are used as starting materials. Condensed polyfluorene obtained by condensation polymerization. amine. Examples of the diamines include aromatic diamines, alicyclic diamines, and aliphatic diamines. As the tetracarboxylic dianhydride, an aromatic tetracarboxylic dianhydride, an alicyclic tetracarboxylic dianhydride, an acyclic aliphatic tetracarboxylic dianhydride, or the like can be used. Diamines and tetracarboxylic dianhydrides can be used alone or in combination of two or more. A tetracarboxylic acid compound such as a tetracarboxylic acid compound analog such as a chloro compound may also be selected as a starting material and used instead of tetracarboxylic dianhydride.

The cycloolefin-based resin is, for example, a thermoplastic resin having a monomer unit composed of a cyclic olefin (cycloolefin) such as norbornene and a polycyclic norbornene-based monomer, and is also referred to as a thermoplastic cycloolefin-based resin. The cycloolefin-based resin may be a ring-opening copolymer of the above-mentioned cyclic olefin, a hydrogenated product of a ring-opening copolymer using two or more kinds of cyclic olefins, or a cyclic olefin and a chain olefin, and may have polymerizability such as a vinyl group. Additive polymers such as double bond aromatic compounds. A polar group may be introduced into a cycloolefin-based resin.

When a cyclic olefin, a chain olefin, and / or a copolymer of an aromatic compound having a vinyl group is used to constitute the first protective film, as the chain olefin, for example, ethylene, propylene, etc., and as an aromatic compound having a vinyl group, Examples include styrene, α-methylstyrene, and nucleoalkyl-substituted styrene. In such a copolymer, the monomer unit composed of a cyclic olefin may be 50 mol% or less, and more preferably about 15 to 50 mol%. In particular, when a terpolymer of a cyclic olefin, a chain olefin, and an aromatic compound having a vinyl group is used to constitute the first protective film, the monomer unit composed of the cyclic olefin may be smaller than the above. In such a terpolymer, a monomer unit composed of a chain olefin is usually 5 to 80 mole%, and a monomer unit composed of an aromatic compound having a vinyl group is usually 5 to 80 mole%.

As the cycloolefin-based resin, a suitable commercially available product can be used. For example, "TOPAS" sold by POLYPLASTIC, "ARTON" sold by JSR, "ZEONOR" and "ZEONEX" sold by Japan's ZEON, and "APEL" sold by Mitsui Chemicals (the above are all products) First name) and so on.

The storage elastic modulus E of the resin (A) at 23 ° C is usually 100 MPa or more, more preferably 300 MPa or more, more preferably 500 MPa or more, and particularly preferably 1000 MPa or more. There is no upper limit, but it is usually below 100,000 MPa.

The light selective absorption compound (B) is a compound that selectively absorbs light having a wavelength of 405 nm, and a compound satisfying the formula (4), and a compound satisfying the formula (5) is more preferable.

ε (405) ≧ 20 (4)

[In formula (4), ε (405) represents the gram absorption coefficient of a compound having a wavelength of 405 nm; the unit of the gram absorption coefficient is L / (g · cm)].

ε (405) / ε (440) ≧ 20 (5)

[In formula (5), ε (405) represents a gram absorption coefficient of a compound having a wavelength of 405 nm; ε (440) represents a gram absorption coefficient of a wavelength of 440 nm;].

The gram absorption coefficient was measured by the method described in the examples.

A compound having a larger value of ε (405) indicates that it easily absorbs light having a wavelength of 405 nm, and easily exhibits a function of suppressing deterioration due to ultraviolet rays and short-wavelength visible light. When the value of ε (405) is less than 20 L / (g.cm), in order to express the retardation function of the retardation film or the organic EL light-emitting element due to ultraviolet rays and short-wavelength visible light, it is necessary to increase the resin composition of the present invention. The content of the light selective absorbing compound (B) in the substance. When the content of the light-selective absorbing compound (B) is increased, the light-selective absorbing compound (B) is exuded or unevenly dispersed, and the light-absorbing function becomes insufficient. The value of ε (405) is preferably 20L / (g.cm) or more, more preferably 30L / (g.cm) or more, more preferably 40L / (g.cm) or more, and usually 500L / (g.cm) or less .

A compound having a larger value of ε (405) / ε (440) does not hinder the color performance of the display device, and can suppress light degradation of a display device such as a retardation film that absorbs light near 405 nm or an organic EL light-emitting element. The value of ε (405) / ε (440) is preferably 20 or more, more preferably 40 or more, more preferably 70 or more, and particularly preferably 80 or more.

The light selective absorption compound (B) is preferably a compound containing a merocyanine structure in the molecule. As a compound containing a part of anthocyanin structure in the molecule, it is a compound containing a partial structure represented by-(NC = CC = C)-in the molecule, for example, a methocyanin compound, anthocyanin compound, and indole Compounds, benzotriazole-based compounds, and the like are preferably anthocyanin-based compounds, anthocyanin-based compounds, and benzotriazole-based compounds, and more preferably compounds represented by formula (I).

[Wherein R ¹ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 25 carbon atoms which may have a substituent, an aralkyl group having 7 to 15 carbon atoms which may have a substituent, and 6 to 15 carbon atoms Aromatic group, heterocyclic group, -CH ₂ -contained in the alkyl group or aralkyl group may be replaced by -NR ^1A- , -CO-, -SO _2- , -O-, or -S-; R ^1A represents A hydrogen atom or an alkyl group having 1 to 6 carbons; R ² , R ³ and R ⁴ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbons which may have a substituent, an aromatic hydrocarbon group which may have a substituent or An aromatic heterocyclic group which may have a substituent, -CH ₂ -contained in the alkyl group may be replaced with -NR ^1B- , -CO-, -SO _2- , -O-, or -S-; R ^1B represents hydrogen An atom or an alkyl group having 1 to 6 carbon atoms; R ⁶ and R ⁷ each independently represent a hydrogen atom, an alkyl group having 1 to 25 carbon atoms or an electron attracting group, and R ⁶ and R ⁷ may be connected to each other to form a ring structure; R ¹ and R ² can be connected to each other to form a ring structure, R ² and R ³ can be connected to each other to form a ring structure, R ² and R ⁴ can be connected to each other to form a ring structure, and R ³ and R ⁶ can be connected to each other to form a ring structure. ]

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ include methyl, ethyl, n-propyl, isopropyl, 2-cyanopropyl, n-butyl, third butyl, 2nd butyl, n-pentyl, n-hexyl, 1-methylbutyl, 3-methylbutyl, n-octyl, n-decyl, 2-hexyloctyl, and the like.

Examples of the substituent which the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ may have include the groups described in the following A group.

Group A: nitro, hydroxyl, carboxyl, sulfo, cyano, amine, halogen atom, alkoxy having 1 to 6 carbons, alkylsilyl having 1 to 12 carbons, alkane having 2 to 8 carbons Carbonyl group, * -R ^a1- (OR ^a2 ) _t1 -R ^a3 (R ^a1 and R ^a2 each independently represent an alkanediyl group having 1 to 6 carbon atoms, R ^a3 represents an alkyl group having 1 to 6 carbon atoms, and t1 represents An integer of 1 to 3).

Examples of the alkylsilyl group having 1 to 12 carbon atoms include monoalkylsilyl groups such as methylsilyl, ethylsilyl, and propylsilyl; dimethylsilyl, diethylsilyl, and methylethyl Dialkylsilyl groups such as trisilyl groups; trialkylsilyl groups such as trimethylsilyl groups, triethylsilyl groups, and tripropylsilyl groups.

Examples of the alkylcarbonyl group having 2 to 8 carbon atoms include a methylcarbonyl group and an ethylcarbonyl group.

Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.

Examples of the aralkyl group having 7 to 15 carbon atoms represented by R ¹ and R ⁵ include benzyl and phenylethyl. Examples of the group in which -CH ₂ -contained in the aralkyl group is replaced with -SO ₂ -or -COO- include 2-phenylethyl acetate.

Examples of the substituent which the aralkyl group having 7 to 15 carbon atoms represented by R ¹ and R ⁵ may have include a group described in the following A group.

Examples of the aromatic group having 6 to 15 carbon atoms represented by R ¹ and R ⁵ include a phenyl group, a naphthyl group, and an anthryl group.

Examples of the substituent which the aromatic group having 6 to 15 carbon atoms represented by R ¹ and R ⁵ may have include the groups described in the above-mentioned A group.

Examples of the heterocyclic group having 6 to 15 carbon atoms represented by R ¹ and R ⁵ include pyridyl, pyrrolidinyl, quinolyl, thienyl, imidazolyl, oxazolyl, pyrrolyl, thiazolyl, and furanyl. An aromatic heterocyclic group having 3 to 9 carbon atoms.

Examples of the alkyl group having 1 to 6 carbon atoms represented by R ^1A and R ^1B include methyl, ethyl, n-propyl, isopropyl, n-butyl, third butyl, second butyl, and n-pentyl. Base, n-hexyl, etc.

Examples of the alkyl group having 1 to 6 carbon atoms represented by R ² , R ³ and R ^{4 are the} same as the alkyl group having 1 to 6 carbon atoms represented by R ^1B .

Examples of the substituent which the alkyl group having 1 to 6 carbons represented by R ² , R ³ and R ⁴ may have include the groups described in the above-mentioned A group.

Examples of the aromatic hydrocarbon group represented by R ² , R ³ and R ⁴ include an aromatic group having 6 to 15 carbons such as phenyl, naphthyl, and anthracenyl; and an aromatic group having 7 to 15 carbons such as benzyl and phenylethyl Aralkyl.

Examples of the substituent which the aromatic hydrocarbon group represented by R ² , R ³ and R ⁴ may have include the groups described in the above-mentioned A group.

Examples of the aromatic heterocyclic group represented by R ² , R ³ and R ⁴ include carbons such as pyridyl, pyrrolidinyl, quinolyl, thienyl, imidazolyl, oxazolyl, pyrrolyl, thiazolyl, and furyl. 3 to 9 aromatic heterocyclic groups.

Examples of the substituent which the aromatic heterocyclic group represented by R ² , R ³ and R ⁴ may have include the groups described in the above-mentioned A group.

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ^{7 are the} same as the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ .

Examples of the substituent which the C 1 to 25 alkyl group represented by R ⁶ and R ⁷ may have include the groups described in the above-mentioned A group.

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ^{7 are the} same as the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ .

Examples of the electron-attracting group represented by R ⁶ and R ⁷ include a cyano group, a nitro group, a halogen atom, a halogen-substituted alkyl group, and a group represented by the formula (I-1).

^* -X ¹ -R ¹¹ (I-1)

[Wherein, R ¹¹ represents a hydrogen atom or an alkyl group having 1 to 25 carbon atoms, and at least one of the methylene groups contained in the alkyl group may be replaced by an oxygen atom; X ¹ represents -CO-, -COO-, -OCO-, -CS-, -CSO-, -CSS-, -NR ¹² CO- or CONR ^13- ; R ¹² and R ¹³ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a phenyl group. ]

Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

Examples of the halogen-substituted alkyl group include trifluoromethyl, pentafluoroethyl, perfluoropropyl, perfluoroisopropyl, perfluorobutyl, perfluorosecond butyl, and perfluorothird Perfluoroalkyl groups such as butyl, perfluoropentyl, and perfluorohexyl. The number of carbon atoms as the halogen-substituted alkyl group is usually 1 to 25.

R ⁶ and R ⁷ can be connected to each other to form a ring structure. As the ring structure formed by R ⁶ and R ⁷ , for example, Meldrum's acid structure, Barbituric acid structure, and Dimedone Structure, etc.

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ^{11 are the} same as the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ .

As the ring structure formed by connecting R ² and R ^{3 to} each other, it is a nitrogen-containing ring structure including a nitrogen atom bonded to R ² , and examples thereof include a nitrogen-containing heterocyclic ring having 4 to 14 members. The ring structure formed by R ² and R ^{3 being} connected to each other may be a single ring or a polycyclic ring. Specific examples thereof include a pyrrolidine ring, a pyrrolline ring, an imidazolidine ring, an imidazoline ring, an oxazoline ring, a thiazoline ring, a piperidine ring, a morpholine ring, a piperazine ring, an indole ring, and an isoindole ring. Wait.

The ring structure formed by R ¹ and R ^{2 being} connected to each other is a nitrogen-containing ring structure including a nitrogen atom bonded to R ¹ and R ^2. For example, a ring of 4 to 14 members (preferably 4 to 8 members) may be mentioned. Ring) nitrogen-containing heterocyclic ring. The ring structure formed by R ¹ and R ^{2 being} connected to each other may be a single ring or a polycyclic ring. Specifically, the same ring structure as R ² and R ³ connected to each other can be mentioned.

Examples of the ring structure in which R ² and R ^{4 are} connected to each other include a nitrogen-containing ring structure of a 4- to 14-membered ring, and a nitrogen-containing ring structure of a 5- to 9-membered ring is more preferable. The ring structure formed by connecting R ² and R ^{4 to} each other may be a single ring or a polycyclic ring. These rings may have a substituent, and examples of such a ring structure include the same ones as the ring structures formed by the aforementioned R ² and R ³ .

As a ring structure in which R ³ and R ^{6 are} connected to each other, a ring structure in which R ³ -C = CC = CR ⁶ forms a ring skeleton. Examples include phenyl.

Examples of the compound represented by formula (I) in which R ² and R ^{3 are} linked to each other to form a ring structure include compounds represented by formula (IA), and represented by formula (I) in which R ² and R ^{4 are} linked to each other to form a ring structure. Examples of the compound include compounds represented by formula (IB).

[In Formula (IA) and Formula (IB), R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ^6, and R ⁷ each have the same meaning as described above; and Ring W ¹ and Ring W ² are each independently Represents a nitrogen-containing ring. ]

The ring W ¹ and the ring W ² represent a nitrogen-containing ring that is a nitrogen-containing atom as a constituent unit of the ring. Each of the ring W ¹ and the ring W ² may be a single ring or a polycyclic ring, and may include a hetero atom other than a nitrogen atom as a constituent unit of the ring. The rings W ¹ and W ² are each preferably a ring having 5 to 9 rings.

The compound represented by formula (I-A) is preferably a compound represented by formula (I-A-1).

[In formula (IA-1), R ¹ , R ⁴ , R ⁵ , R ^6, and R ⁷ each have the same meaning as above; A ¹ represents -CH _2- , -O-, -S-, or -NR ^1D -; R ¹⁴ and R ¹⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms; R ^1D represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. ]

The compound represented by formula (I-B) is preferably a compound represented by formula (I-B-1) and a compound represented by formula (I-B-2).

[In formula (IB-1), R ¹ , R ^6, and R ⁷ each have the same meaning as described above; and R ¹⁶ each independently represents a hydrogen atom or an alkyl group or an aromatic group having 1 to 12 carbon atoms. ]

[In formula (IB-2), R ³ , R ⁵ , R ^6, and R ⁷ each have the same meaning as above; R ³⁰ represents a hydrogen atom, a cyano group, a nitro group, a halogen atom, a thiol group, an amine group, and a carbon number Alkyl groups of 1 to 12, alkoxy groups of 1 to 12 carbons, aromatic hydrocarbon groups of 6 to 18 carbons, fluorenyl groups of 2 to 13 carbons, fluorenyl groups of 2 to 13 carbons, or 2 to 13 carbons Alkoxycarbonyl; R ³¹ represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a mercapto group, an alkylthio group having 1 to 12 carbon atoms, an amino group which may have a substituent, or a heterocyclic ring base. ]

Examples of the halogen atom represented by R ³⁰ include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

Examples of the fluorenyl group having 2 to 13 carbon atoms represented by R ³⁰ include an ethenyl group, a propionyl group, and a butyl fluorenyl group.

Examples of the fluorenyloxy group having 2 to 13 carbon atoms represented by R ³⁰ include a methylcarbonyloxy group, an ethylcarbonyloxy group, a propylcarbonyloxy group, a butylcarbonyloxy group, and the like.

Examples of the alkoxycarbonyl group having 2 to 13 carbon atoms represented by R ³⁰ include a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, and a butoxycarbonyl group.

Examples of the aromatic hydrocarbon group having 6 to 18 carbon atoms represented by R ³⁰ include aromatic groups having 6 to 18 carbon atoms such as phenyl, naphthyl, and biphenyl groups; and 7 to 18 carbon atoms such as benzyl group and phenylethyl group. Aralkyl.

Examples of the alkyl group having 1 to 12 carbon atoms represented by R ^{30 are the} same as the alkyl group having 1 to 12 carbon atoms represented by R ¹⁴ .

Examples of the alkoxy group having 1 to 12 carbon atoms represented by R ³⁰ include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a pentoxy group.

R ³⁰ is preferably an alkyl group having 1 to 12 carbons, an alkoxy group having 1 to 12 carbons, an amine group, or a mercapto group.

Examples of the alkyl group having 1 to 12 carbon atoms represented by R ^{31 are the} same as the alkyl group having 1 to 12 carbon atoms represented by R ¹⁴ .

Examples of the alkoxy group having 1 to 12 carbon atoms represented by R ^{31 are the} same as the alkoxy group having 1 to 12 carbon atoms represented by R ³⁰ .

Examples of the alkylthio group having 1 to 12 carbon atoms represented by R ³¹ include a methylthio group, an ethylthio group, a propylthio group, a butylthio group, a pentylthio group, and a hexylthio group.

Examples of the amine group which may have a substituent represented by R ³¹ include amine groups; amine groups substituted with an alkyl group having 1 to 8 carbon atoms such as N-methylamino group and N-ethylamino group; N, N-dimethylamino, N, N-diethylamino, N, N-methylethylamino and the like are substituted with 2 alkyl groups having 1 to 8 carbons and the like.

Examples of the heterocyclic group represented by R ³¹ include a nitrogen-containing heterocyclic group having 4 to 9 carbon atoms such as pyrrolidinyl, piperidinyl, and morpholinyl.

Examples of the compound represented by formula (I) in which R ³ and R ^{6 are} linked to each other to form a ring structure and R ² and R ^{4 are} linked to each other to form a ring structure include a compound represented by formula (IC).

[In the formula (IC), R ¹ , R ⁶ and R ⁷ each have the same meaning as above; R ²¹ and R ²² each independently represent a hydrogen atom, an alkyl group or a hydroxyl group having 1 to 12 carbons; X ² and X ³ each independently represents -CH ₂ -or -N (R ²⁵ ) =; R ²⁵ represents a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, and an aromatic hydrocarbon group which may have a substituent. ]

As the carbon to which R ²⁵ represents alkyl having 1 to 25 include alkyl group represented by R ¹ and the carbon number of 1 to 25 are the same.

Examples of the aromatic hydrocarbon group represented by R ²⁵ include aromatic groups such as phenyl and naphthyl; aralkyl groups such as benzyl and phenylethyl; biphenyl groups and the like, and aromatic hydrocarbon groups having 6 to 20 carbon atoms are preferred. . Examples of the substituent which the aromatic hydrocarbon group represented by R ²⁵ may have include a hydroxyl group and the like.

It is preferable that R ³ and R ⁶ are each independently an electron attracting group.

Examples of the compound represented by formula (I) in which R ¹ and R ^{2 are} linked to each other to form a ring structure and R ³ and R ^{6 are} linked to each other to form a ring structure include compounds represented by formula (ID).

[In the formula (ID), R ⁴ , R ^5, and R ⁷ each have the same meaning as described above; R ²⁵ , R ²⁶ , R ^27, and R ²⁸ each independently represent a hydrogen atom, and the number of carbon atoms which may have a substituent is 1 to 12 alkyl, hydroxy, aralkyl. ]

Examples of the alkyl group having 1 to 12 carbon atoms represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ include the same as the alkyl group having 1 to 12 carbon atoms represented by R ^1A and R ^1B . Examples of the substituent which the alkyl group having 1 to 12 carbons represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ may have include a hydroxyl group.

Examples of the aralkyl group represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ include an aralkyl group having 7 to 15 carbon atoms such as benzyl and phenylethyl.

Examples of compounds represented by formula (I) in which R ⁶ and R ^{7 are} linked to each other to form a ring structure include compounds represented by formula (IE).

[In formula (IE), R ¹ , R ³ , R ^4, and R ⁵ each have the same meaning as described above; and ring W ³ represents a cyclic compound. ]

The ring W ³ is a ring having a 5-membered ring to a 9-membered ring, and may include a hetero atom such as a nitrogen atom, an oxygen atom, or a sulfur atom as a constituent unit of the ring.

The compound represented by formula (I-E) is preferably a compound represented by formula (IE-1).

[In the formula (IE-1), R ¹ , R ² , R ^3, and R ⁵ each have the same meaning as described above; R ¹⁷ , R ¹⁸ , R ¹⁹ , and R ^q each independently represent a hydrogen atom or may have a substituent Alkyl, aralkyl, and aromatic groups having 1 to 12 carbon atoms, -CH ₂ -contained in the alkyl or aralkyl group may be -NR ^1D- , -C (= O)-, -C (= S)-, -O-, -S- substitution; R ¹⁷ and R ¹⁸ can be connected to each other to form a ring structure; R ¹⁸ and R ¹⁹ can be connected to each other to form a ring structure; R ¹⁹ and R ^q can be connected to each other to form a ring Structure; m, p, q each independently represent an integer from 0 to 3. ]

Examples of the compound represented by the formula (I) include the following compounds.

The content of the light selective absorbing compound (B) is usually 0.01 to 20 parts by mass, more preferably 0.05 to 15 parts by mass, more preferably 0.1 to 10 parts by mass, and even more preferably 100 parts by mass of the resin (A). 0.1 to 5 parts by mass.

The resin composition (1) may further include a plasticizer, an organic acid, a pigment, an antistatic agent, a surfactant, a lubricant, a flame retardant, a filler, rubber particles, a retardation adjusting agent, an ultraviolet absorber, and the like.

As a method for producing the optical film of the present invention, any appropriate forming method can be adopted. Specifically, for example, a compression molding method, a transfer molding method, an injection molding method, an extrusion molding method, a blow molding method, a powder molding method, a FRP molding method, a mold coating method (for example, a flow injection method), a calendering method, a thermal method Press method and so on. In order to improve the smoothness of the obtained film, since good optical uniformity can be obtained, an extrusion molding method or a mold coating method is preferred. The molding conditions can be appropriately set in accordance with the composition and type of the resin to be used, desired characteristics of the retardation film, and the like.

The thickness of the optical film of the present invention is usually 1 to 500 μm, more preferably 5 to 300 μm, more preferably 10 to 150 μm, and particularly preferably 10 to 75 μm.

The optical film of the present invention may be unstretched or stretched. In the case where the optical film of the present invention is stretched, it may be uniaxially stretched or biaxially stretched. The stretching ratio is usually 1.01 to 10 times, and more preferably 1.01 to 6 times. The extending direction can be performed in various directions and dimensions such as a length direction, a width direction, a thickness direction, and an oblique direction.

The adhesive-attached optical film of the present invention is a film having an adhesive layer on at least one side of the optical film of the present invention. The adhesive layer is formed by a conventional adhesive. As the conventional adhesive, any of adhesives having a matrix polymer such as acrylic, rubber, urethane, polysiloxane, and polyvinyl ether can be used, and the (meth) acrylic resin (A) is included. An acrylic adhesive is preferred as the matrix polymer.

The (meth) acrylic resin (A) is more preferably a polymer containing (meth) acrylic acid ester-based constituent units as a main component (more preferably, 50% by mass or more). The (meth) acrylate-derived constitutional unit may include one or more types of constitutional units derived from a monomer other than (meth) acrylate (for example, a constitutional unit derived from a monomer having a polar functional group). In this specification, (meth) acrylic acid means either acrylic acid or methacrylic acid, and "(meth)" when referring to (meth) acrylate or the like has the same meaning.

Examples of the (meth) acrylate include a (meth) acrylate represented by the following formula (I).

[In formula (I), R ₁ represents a hydrogen atom or a methyl group, R ₂ represents an alkyl group having 1 to 14 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, the alkyl group or the hydrogen atom of the aralkyl group, It may be substituted by an alkoxy group having 1 to 10 carbon atoms. ]

In formula (I), R _{2 is} more preferably an alkyl group having 1 to 14 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.

Examples of the (meth) acrylate represented by formula (I) include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, N-amyl (meth) acrylate, n-hexyl (meth) acrylate, n-heptyl (meth) acrylate, n-octyl (meth) acrylate, n-nonyl (meth) acrylate, n- (meth) acrylate Linear alkyl (meth) acrylic acid esters such as decyl ester, n-dodecyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate; isopropyl (meth) acrylate Ester, isobutyl (meth) acrylate, third butyl (meth) acrylate, isoamyl (meth) acrylate, isohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Branched alkyl (meth) acrylic acid such as isooctyl (meth) acrylate, isononyl (meth) acrylate, isostearyl (meth) acrylate, and isoamyl (meth) acrylate; (Cyclo) hexyl acrylate, isoamyl (meth) acrylate, adamantane (meth) acrylate, dicyclopentyl (meth) acrylate, cyclododecyl (meth) acrylate, (meth) Methyl cyclohexyl acrylate, Aliphatic skeleton-containing alkyl esters of (meth) acrylic acid such as trimethylcyclohexyl (meth) acrylate, 3butylcyclohexyl (meth) acrylate, and cyclohexyl α-ethoxyacrylate; ( An aromatic ring skeleton-containing ester of (meth) acrylic acid such as phenyl (meth) acrylate and the like.

In addition, examples of the alkyl (meth) acrylate containing a substituent include a substituent introduced into the alkyl group of the alkyl (meth) acrylate. The substituent of the alkyl (meth) acrylate containing a substituent is a hydrogen atom substituted with an alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the alkyl (meth) acrylate containing a substituent include 2-methoxyethyl (meth) acrylate, ethoxymethyl (meth) acrylate, and phenoxy (meth) acrylate Ethyl ester, 2- (2-phenoxyethoxy) ethyl (meth) acrylate, phenoxy diethylene glycol (meth) acrylate, phenoxy poly (ethylene glycol) (meth) acrylate ) Esters.

These (meth) acrylic acid esters can be used individually or in plural.

The (meth) acrylic resin (A) contains a structural unit derived from a (meth) acrylic acid alkyl ester (a1) having a glass transition temperature Tg of less than 0 ° C derived from a homopolymer and a homopolymer-derived Tg The structural unit of the alkyl (meth) acrylate (a2) which is 0 degreeC or more is preferable. Containing a structural unit derived from an alkyl acrylate (a1) and a structural unit derived from an alkyl acrylate (a2) is advantageous in improving the high-temperature durability of the adhesive layer. The Tg of the homopolymer of the alkyl (meth) acrylate can be, for example, a literature value such as the Polymer Handbook (Wiley-Interscience).

Specific examples of the alkyl (meth) acrylate (a1) include ethyl acrylate, n- and iso-propyl acrylate, n- and iso-butyl acrylate, n-amyl acrylate, n- and acrylate. Hexyl, n-heptyl acrylate, n- and iso-octyl acrylate, 2-ethylhexyl acrylate, n- and iso-nonyl acrylate, n- and iso-decyl acrylate, n- and iso- Alkyl (meth) acrylates having an alkyl group such as dodecyl carbonate having a carbon number of about 2 to 12 and the like.

The alkyl (meth) acrylate (a1) may be used alone or in combination of two or more. Among them, n-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, and the like are more preferred from the viewpoint of followability and reworkability when laminated on an optical film.

The alkyl (meth) acrylate (a2) is an alkyl (meth) acrylate other than the alkyl (meth) acrylate (a1). Specific examples of the (meth) acrylic acid alkyl ester (a2) include methyl acrylate, cyclohexyl acrylate, isoamyl acrylate, stearyl acrylate, and third butyl acrylate.

The alkyl (meth) acrylate (a2) may be used alone or in combination of two or more. Among them, from the viewpoint of high-temperature durability, alkyl (meth) acrylate (a2), including methyl acrylate, cyclohexyl acrylate, isofluorenyl acrylate, and the like are preferable, and methyl acrylate is more preferable.

The structural unit derived from the (meth) acrylic acid ester represented by the formula (I) is preferably 50% by mass or more, and more preferably 60 to 60% of all structural units included in the (meth) acrylic resin (A). 95% by mass, more preferably 65 to 95% by mass.

As a structural unit derived from a monomer other than (meth) acrylate, a structural unit derived from a monomer having a polar functional group is more preferable, and a structural unit derived from (meth) acrylate having a polar functional group is more preferable. Building unit. Examples of the polar functional group include a hydroxyl group, a carboxyl group, a substituted or unsubstituted amino group, and a heterocyclic group such as an epoxy group.

Examples of the monomer having a polar functional group include 1-hydroxymethyl (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 1-hydroxyheptyl (meth) acrylate, and (meth) acrylic acid. 1-hydroxybutyl ester, 1-hydroxypentyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxypentyl (meth) acrylate, 2-hydroxyhexyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 3 (meth) acrylate -Hydroxypentyl ester, 3-hydroxyhexyl (meth) acrylate, 3-hydroxyheptyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 4-hydroxypentyl (meth) acrylate, ( 4-hydroxyhexyl methacrylate, 4-hydroxyheptyl (meth) acrylate, 4-hydroxyoctyl (meth) acrylate, 2-chloro-2-hydroxypropyl (meth) acrylate, (methyl ) 3-chloro-2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 5-hydroxypentyl (meth) acrylate, 5-hydroxyhexyl (meth) acrylate , 5-hydroxyheptyl (meth) acrylate, 5-hydroxyoctyl (meth) acrylate, (methyl ) 5-hydroxynonyl acrylate, 6-hydroxyhexyl (meth) acrylate, 6-hydroxyheptyl (meth) acrylate, 6-hydroxyoctyl (meth) acrylate, 6-hydroxynonyl (meth) acrylate Ester, 6-hydroxydecyl (meth) acrylate, 7-hydroxyheptyl (meth) acrylate, 7-hydroxyoctyl (meth) acrylate, 7-hydroxynonyl (meth) acrylate, (meth) 7-hydroxydecyl acrylate, 7-hydroxyundecyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 8-hydroxynonyl (meth) acrylate, 8-hydroxy (meth) acrylate Decyl ester, 8-hydroxyundecyl (meth) acrylate, 8-hydroxydodecyl (meth) acrylate, 9-hydroxynonyl (meth) acrylate, 9-hydroxydecyl (meth) acrylate , 9-hydroxyundecyl (meth) acrylate, 9-hydroxydodecyl (meth) acrylate, 9-hydroxytridecyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate 10-hydroxyundecyl (meth) acrylate, 10-hydroxydodecyl (meth) acrylate, 10-hydroxytridecyl (meth) acrylate, 10-hydroxytetradecyl (meth) acrylate Alkyl ester, 11-hydroxyundecyl (meth) acrylate, (meth) propylene 11-hydroxydodecyl ester, 11-hydroxytridecyl (meth) acrylate, 11-hydroxytetradecanyl (meth) acrylate, 11-hydroxypentadecanyl (meth) acrylate, (methyl ) 12-hydroxydodecyl acrylate, 12-hydroxytridecyl (meth) acrylate, 12-hydroxytetradecanyl (meth) acrylate, 13-hydroxypentadecanyl (meth) acrylate, ( 13-hydroxytetradecanyl methacrylate, 13-hydroxypentadecanyl (meth) acrylate, 14-hydroxytetradecanyl (meth) acrylate, 14-hydroxypentadecanyl (meth) acrylate Monomers having a hydroxyl group, such as 15-hydroxypentadecanyl (meth) acrylate, 15-hydroxyheptadecanyl (meth) acrylate; (meth) acrylic acid, carboxyalkyl (meth) acrylate Monomers having a carboxyl group, such as carboxyethyl methacrylate, carboxypentyl (meth) acrylate), maleic acid, maleic anhydride, fumaric acid, crotonic acid, etc; Caprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofuran methyl (meth) acrylate, tetrahydrofuran methyl acrylate modified, 3,4-epoxy (meth) acrylate already Monomers having heterocyclic groups such as methyl ester, glycidyl (meth) acrylate, 2,5-dihydrofuran; aminoethyl (meth) acrylate, N, N-dimethyl (meth) acrylate Monomers having a substituted or unsubstituted amine group, such as aminoaminoethyl ester and dimethylaminopropyl (meth) acrylate.

Among these, at the point of the reactivity between the (meth) acrylate polymer and the cross-linking agent, a monomer having a hydroxyl group or a monomer having a carboxyl group is preferable, and a monomer including a hydroxyl group and a monomer having a carboxyl group is more preferable ideal.

The monomer having a hydroxyl group is preferably 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 5-hydroxypentyl acrylate, or 6-hydroxyhexyl acrylate. In particular, good durability can be obtained by using 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and 5-hydroxypentyl acrylate.

As the monomer having a carboxyl group, acrylic acid is preferably used.

From the viewpoint of preventing an increase in the peeling force of the separator film that can be laminated on the outer surface of the adhesive layer, it is preferable not to substantially contain a monomer having an amine group. The term "substantially not included" herein means that the total weight of all constituent units constituting the (meth) acrylic resin (A) is 0.1 part by weight or less.

The content of the constituent unit derived from the monomer having a polar functional group is preferably 20 parts by mass or less, and more preferably 0.5 part by mass with respect to 100 parts by mass of all the constituent units of the (meth) acrylic resin (A). The above and 15 parts by mass are more preferably 0.5 parts by mass or more and 10 parts by mass or less, and particularly preferably 1 part by mass or more and 7 parts by mass or less.

The content of the constituent unit derived from the monomer having an aromatic group is preferably 20 parts by mass or less, and more preferably 4 parts by mass, with respect to 100 parts by mass of all the constituent units of the (meth) acrylic resin (A). The above 20 parts by mass or less is more preferably 4 parts by mass or more and 16 parts by mass or less.

Examples of the structural unit derived from a monomer other than (meth) acrylates include a structural unit derived from a styrene-based monomer, a structural unit derived from a vinyl-based monomer, and a structural unit derived from a plurality of (meth) groups in the molecule. ) A structural unit of acrylfluorene-based monomer, a structural unit derived from a (meth) acrylamidoamine-based monomer, and the like.

Examples of the styrene-based monomer include styrene; methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, and propylstyrene Alkyl styrenes such as butylstyrene, hexylstyrene, heptylstyrene, octylstyrene; halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, iodostyrene; Nitrostyrene; ethylfluorenylstyrene; methoxystyrene; and divinylbenzene.

Examples of the vinyl monomers include fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, and vinyl laurate; and halogenated ethylene such as vinyl chloride and ethylene bromide. ; Halogenated vinylidene such as vinylidene chloride; nitrogen-containing heteroaromatic ethylene such as vinylpyridine, vinylpyrrolidone, vinylcarbazole; conjugated diene such as butadiene, isoprene, chloroprene; and Unsaturated nitriles such as acrylonitrile and methacrylonitrile.

Examples of the monomer having a plurality of (meth) acrylfluorene groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1 , 9-nonanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, three Monomers having 2 (meth) acrylfluorene groups in the molecule, such as propylene glycol di (meth) acrylate; Monomers having 3 (meth) acrylfluorene groups in the molecule, such as trihydroxypropane tri (meth) acrylate body.

Examples of the (meth) acrylamide-based monomer include N-hydroxymethyl (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, and N- (3-hydroxyl) (Propyl) (meth) acrylamide, N- (4-hydroxybutyl) (meth) acrylamide, N- (5-hydroxypentyl) (meth) acrylamide, N- (6- Hydroxyhexyl) (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (methyl) Acrylamide, N- (3-dimethylaminopropyl) (meth) acrylamide, N- (1,1-dimethyl-3-oxobutyl) (meth) acrylamine Amine, N- [2- (2- pendant oxy-1-imidazolyl) ethyl] (meth) acrylamide, 2-propenylamino-2-methyl-1-propanesulfonic acid, N -(Methoxymethyl) acrylamide, N- (ethoxymethyl) (meth) acrylamide, N- (propoxymethyl) (meth) acrylamide, N- (1 -Methylethoxymethyl) (meth) acrylamide, N- (1-methylpropoxymethyl) (meth) acrylamide, N- (2-methylpropoxymethyl) ) (Meth) acrylamide, N- (butoxymethyl) (meth) acrylamide, N- (1,1-dimethylethoxymethyl) (meth) acrylamide, N- (2-methoxyethyl) (methyl ) Acrylamide, N- (2-ethoxyethyl) (meth) acrylamide, N- (2-propoxyethyl) (meth) acrylamide, N- [2- (1 -Methylethoxy) ethyl] (meth) acrylamide, N- [2- (1-methylpropoxy) ethyl] (meth) acrylamide, N- [2- (2 -Methylpropoxy) ethyl] (meth) acrylamide, N- (2-butoxyethyl) (meth) acrylamide, N- [2- (1,1-dimethyl Ethoxy) ethyl] (meth) acrylamide and the like. Among them, N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) Acrylamide and N- (2-methylpropoxymethyl) acrylamide are preferred.

The weight average molecular weight (Mw) of the (meth) acrylic resin (A) is preferably from 500,000 to 2.5 million. When the weight-average molecular weight is 500,000 or more, the durability of the adhesive layer in a high-temperature environment is improved, and defects such as floating peeling between the adherend and the adhesive layer and aggregation failure of the adhesive layer are easily suppressed. When the weight average molecular weight is 2.5 million or less, the adhesive composition is advantageous from the viewpoint of, for example, applicability when processed into a sheet form. From the viewpoint of having both the durability of the adhesive layer and the coatability of the adhesive composition, the weight average molecular weight is preferably 600,000 to 1.8 million, more preferably 700,000 to 1.7 million, and particularly preferably 1 million to 1.6 million. . The molecular weight distribution (Mw / Mn) representing the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is usually 2 to 10, more preferably 3 to 8, and even more preferably 3 to 6. The weight average molecular weight can be analyzed by a gel permeation chromatography, and is a value converted into standard polystyrene.

When the (meth) acrylic resin (A) is dissolved in ethyl acetate to a concentration of 20% by mass, the viscosity at 25 ° C is 20 Pa. s is ideal, 0.1 to 15Pa. s is more ideal. The viscosity in this range is advantageous from the viewpoint of the applicability when the adhesive composition is applied to a substrate. Moreover, the viscosity can be measured by a Brookfield viscometer.

The glass transition temperature (Tg) of the (meth) acrylic resin (A) is, for example, -60 to 20 ° C, more preferably -50 to 15 ° C, more preferably -45 to 10 ° C, and particularly preferably -40 to 0 ° C. When Tg is below the upper limit value, it is advantageous to increase the wettability of the adhesive layer to the adherend substrate, and when Tg is above the lower limit value, it is advantageous to improve the durability of the adhesive layer. The glass transition temperature can be measured by a differential scanning calorimeter (DSC).

The (meth) acrylic resin (A) can be produced, for example, by a known method such as a solution polymerization method, a block polymerization method, a suspension polymerization method, and an emulsion polymerization method, and is particularly preferably a solution polymerization method. Examples of the solution polymerization method include mixing monomers and organic solvents, adding a thermal polymerization initiator under a nitrogen atmosphere, and at a temperature of 40 to 90 ° C, preferably 50 to 80 ° C, for 3 to 15 hours. Method of stirring left and right. In order to control the reaction, a monomer thermal polymerization initiator may be added continuously or intermittently during the polymerization. The monomer and the thermal polymerization initiator may be added to an organic solvent.

As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, or the like is used. Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone and the like. Examples of the thermal polymerization initiator include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), and 1,1'-azobis (cyclohexane). -1-carbonitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxypentyl) Nitrile), dimethyl-2,2'-azobis (2-methylpropionate), 2,2'-azobis (2-hydroxymethylpropionitrile) and other azo compounds; dodecane Base peroxide, 3butyl hydroperoxide, benzamyl peroxide, 3butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxide dicarbonate, peroxydicarbonate Organic peroxides such as dipropyl ester, tertiary butyl peroxydecanoate, tertiary butyl pervalerate, peroxy (3,5,5-trimethylhexyl); potassium persulfate, Inorganic peroxides such as ammonium persulfate and hydrogen peroxide. Further, a redox-based initiator such as a peroxide and a reducing agent may be used in combination.

The proportion of the polymerization initiator is about 0.001 to 5 parts by mass for 100 parts by mass of the total amount of the monomers constituting the (meth) acrylic resin. For the polymerization of the (meth) acrylic resin, a polymerization method using active energy rays (for example, ultraviolet rays) can be used.

Examples of organic solvents include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propanol and isopropanol; acetone, methyl ethyl ketone, and methyl isobutyl Ketones and the like.

The content of the (meth) acrylic resin (A) is usually 60% to 99.9% by mass in 100% by weight of the adhesive composition, more preferably 70% to 99.5% by mass, and more preferably 80% by mass To 99% by mass.

The adhesive composition may contain a crosslinking agent (b). This crosslinking agent (b) reacts with a polar functional group (for example, a hydroxyl group, an amino group, a carboxyl group, a heterocyclic group, etc.) in the (meth) acrylic resin (A). The cross-linking agent (b) forms a cross-linked structure with a (meth) acrylic resin, etc., and forms a cross-linked structure that is advantageous for durability and reworkability.

Examples of the cross-linking agent (b) include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, metal adduct-based cross-linking agents, and the like, particularly from the pot life of the adhesive composition. From the viewpoints of durability and cross-linking speed of the adhesive layer, an isocyanate-based cross-linking agent is preferred.

The isocyanate-based compound is preferably a compound having at least two isocyanate groups (-NCO) in the molecule, and examples thereof include aliphatic isocyanate-based compounds (for example, hexamethylene diisocyanate, etc.), and alicyclic isocyanate-based compounds ( For example, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylyl diisocyanate, aromatic isocyanate compounds (such as xylylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene Diisocyanate, triphenylmethane triisocyanate, etc.). The cross-linking agent (B) may be an adduct [for example, an adduct of glycerol, trihydroxypropane, or the like] of an isocyanate compound, an isoduct, an isocyanurate, or a condensation compound. Biuret type compounds, polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, and other amine ester prepolymer type isocyanate compounds in addition reactions And other derivatives. The crosslinking agent (B) can be used alone or in combination of two or more kinds. Among these, representative examples include aromatic isocyanate-based compounds (e.g., xylylene diisocyanate, xylylene diisocyanate), aliphatic isocyanate-based compounds (e.g., hexamethylene diisocyanate), or polyol compounds thereof. (E.g. glycerol, trihydroxypropane) adducts or isocyanurates. When the cross-linking agent (B) is an adduct of an aromatic isocyanate compound and / or such a polyol compound or an isocyanurate, it is formed at the most suitable cross-linking density (or cross-linking structure) as Advantageously, the durability of the adhesive layer can be improved. In particular, in the case of an adduct of a tolyl isocyanate-based compound and / or a polyhydric alcohol thereof, for example, even when the adhesive layer is applied to a polarizing plate, the durability can be improved.

The content of the crosslinking agent (b) is usually 0.01 to 15 parts by mass, more preferably 0.05 to 10 parts by mass, and still more preferably 0.1 to 5 parts by mass relative to 100 parts by mass of the (meth) acrylic resin (A). Serving.

The resin composition may further include a silane compound (D).

Examples of the silane compound (D) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri (2-methoxyethoxy) silane, and 3-glycidoxypropyl. Trimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydi Methylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methyl Propylene fluorenyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and the like.

The silane compound (D) may be a polysiloxane oligomer. Specific examples of the polysiloxane oligomer are shown below in the form of a combination of monomers.

3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane Mercaptopropyl-containing oligomers such as methoxysilane oligomers, 3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomers; mercaptomethyltrimethoxysilane-tetramethoxysilane Oligomer, mercaptomethyltriethoxysilane-tetraethoxysilane oligomer, mercaptomethyltriethoxysilane-tetramethoxysilane oligomer, mercaptomethyltriethoxysilane-tetraethyl Mercaptomethyl oligomers such as oxysilane oligomers; 3-glycidoxypropyltrimethoxysilane-tetramethoxysilane oligomers, 3-glycidoxypropyltrimethoxy Silane-tetraethoxysilane oligomer, 3-glycidoxypropyltriethoxysilane-tetramethoxysilane oligomer, 3-glycidoxypropyltriethoxysilane -Tetraethoxysilane oligomer, 3-glycidoxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-glycidoxypropylmethyldimethoxy Silane-tetraethoxysilane Polymer, 3-glycidoxypropylmethyldiethoxysilane-tetramethoxysilane oligomer, 3-glycidoxypropylmethyldiethoxysilane-tetraethoxysilane Oligomers such as 3-glycidoxypropyl groups; 3-methacryloxypropyltrimethoxysilane-tetramethoxysilane oligomers, 3-methacrylic acid Propyltrimethoxysilane-tetraethoxysilane oligomer, 3-methacryloxypropyltriethoxysilane-tetramethoxysilane oligomer, 3-methacryloxysilane Propyltriethoxysilane-tetraethoxysilane oligomer, 3-methacryloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-methacrylium Oxypropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-methacryloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer, 3- Methacryloxypropylmethyldiethoxysilane-tetraethoxysilane oligomers and other oligomers containing methacryloxypropyl; 3-propenyloxypropyltrimethoxy Silane-tetramethoxysilane oligomer, 3-propenyloxypropyl Methoxysilane-tetraethoxysilane oligomer, 3-propenyloxypropyltriethoxysilane-tetramethoxysilane oligomer, 3-propenyloxypropyltriethoxysilane -Tetraethoxysilane oligomer, 3-propenyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-propyleneoxypropylmethyldimethoxysilane -Tetraethoxysilane oligomer, 3-propenyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer, 3-propenyloxypropylmethyldiethoxysilane -Tetraethoxysilane oligomers and oligomers containing acryloxypropyl; vinyltrimethoxysilane-tetramethoxysilane oligomer, vinyltrimethoxysilane-tetraethoxysilane Oligomer, vinyltriethoxysilane-tetramethoxysilane oligomer, vinyltriethoxysilane-tetraethoxysilane oligomer, vinylmethyldimethoxysilane-tetramethylsiloxane Oxysilane oligomer, vinylmethyldimethoxysilane-tetraethoxysilane oligomer, vinylmethyldiethoxysilane-tetramethoxysilane oligomer, vinylmethyldi Silicon ethoxylate Alkyl-containing oligomers such as alkane-tetraethoxysilane oligomers; 3-aminopropyltrimethoxysilane-tetramethoxysilane oligomers, 3-aminopropyltrimethoxysilane Tetraethoxysilane oligomer, 3-aminopropyltriethoxysilane-tetramethoxysilane oligomer, 3-aminopropyltriethoxysilane-tetraethoxysilane oligomer , 3-aminopropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-amine Amino group-containing oligomers, such as propylpropylmethyldiethoxysilane-tetramethoxysilane oligomer, 3-aminopropylmethyldiethoxysilane-tetraethoxysilane oligomer Wait.

The silane compound (D) may be a silane compound represented by the following formula (d1). When the adhesive composition contains a silane compound represented by the following formula (d1), the adhesiveness (or adhesiveness) can be further improved, and an adhesive layer having good peel resistance can be formed. Especially in a high-temperature environment, even when the adhesive layer is applied (or laminated) to a transparent electrode or glass, the adhesiveness (or adhesion) can be maintained and high durability can be exhibited.

(Wherein B represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ -which may constitute the alkanediyl group and the alicyclic hydrocarbon group may be -O- Or -CO- substitution, R ^d7 represents an alkyl group having 1 to 5 carbon atoms, and R ^d8 , R ^d9 , R ^d10 , R ^d11 and R ^d12 each independently represent an alkyl group having 1 to 5 carbon atoms or 1 to 5 carbon atoms Alkoxy)

In formula (d1), B represents an alkyldiyl group having 1 to 20 carbon atoms such as methylene, ethylene, trimethylene, tetramethylene, hexamethylene, heptamethylene, and octamethylene; Cyclobutyl (such as 1,2-cyclobutyl), Cyclopentyl (such as 1,2-cyclopentyl), Cyclohexyl (such as 1,2-cyclohexyl), Cyclooctyl (E.g., 1,2-cyclooctyl), a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, or an alkanediyl group and the -CH ₂ -by-O- or- CO-substituted groups. More preferably, B is an alkanediyl group having 1 to 10 carbon atoms. R ^d7 represents an alkyl group having 1 to 5 carbons such as methyl, ethyl, propyl, isopropyl, butyl, second butyl, third butyl, and pentyl; R ^d8 , R ^d9 , R ^d10 , R R ^D12 and ^D11 each independently represent the carbon atoms in R ^d7 shown in Examples 1-5 alkyl group or a methoxy group, ethoxy, propoxy, isopropoxy, butoxy, 2-butoxy, Alkoxy having 1 to 5 carbons such as 3rd butoxy. More preferably, R ^d8 , R ^d9 , R ^d10 , R ^d11 and R ^d12 are each independently an alkoxy group having 1 to 5 carbon atoms. These silane compounds (D) can be used alone or in combination of two or more.

Specific examples of the silane compound represented by the formula (d1) include (trimethoxysilyl) methane, 1,2-bis (trimethoxysilyl) ethane, and 1,2-bis (triethoxy). Silyl) ethane, 1,3-bis (trimethoxysilyl) propane, 1,3-bis (triethoxysilyl) propane, 1,4-bis (trimethoxysilyl) butane , 1,4-bis (triethoxysilyl) butane, 1,5-bis (trimethoxysilyl) pentane, 1,5-bis (triethoxysilyl) pentane, 1, 6-bis (trimethoxysilyl) hexane, 1,6-bis (triethoxysilyl) hexane, 1,6-bis (tripropoxysilyl) hexane, 1,8-bis (Trimethoxysilyl) octane, 1,8-bis (triethoxysilyl) octane, 1,8-bis (tripropoxysilyl) octane, etc. Oxysilyl) C1-10 alkane; bis (dimethoxymethylsilyl) methane, 1,2-bis (dimethoxymethylsilyl) ethane, 1,2-bis (dimethoxyl) Ethylethylsilyl) ethane, 1,4-bis (dimethoxymethylsilyl) butane, 1,4-bis (dimethoxyethylsilyl) butane, 1,6-bis (Dimethoxymethylsilyl) hexane, 1,6-bis (dimethoxyethylsilyl) hexane, 1,8-bis (dimethoxymethylsilyl) octane, 1 , 8-bis (dimethoxy Ethylsilyl) octane and other bis (diC1-5alkoxyC1-5alkylsilyl) C1-10alkane and other; 1,6-bis (methoxydimethylsilyl) hexane, 1 , 8-bis (methoxydimethylsilyl) octane and other bis (monoC1-5alkoxydiC1-5alkylsilyl) C1-10 alkane and the like. Among these, 1,2-bis (trimethoxysilyl) ethane, 1,3-bis (trimethoxysilyl) propane, and 1,4-bis (trimethoxysilyl) butyl are more preferable. Bis (trimethylsilyl), 1,5-bis (trimethoxysilyl) pentane, 1,6-bis (trimethoxysilyl) hexane, 1,8-bis (trimethoxysilyl) octane, etc. C1-3 alkoxysilyl) C1-10 alkane, particularly 1,6-bis (trimethoxysilyl) hexane and 1,8-bis (trimethoxysilyl) octane are preferred.

The content of the silane compound (D) is usually 0.01 to 10 parts by weight, more preferably 0.03 to 5 parts by weight, and still more preferably 0.05 to 2 parts by weight based on 100 parts by weight of the (meth) acrylic resin (A). And more preferably 0.01 to 1 part by weight. When the lower limit value is less than the above value, it is advantageous to inhibit the silane compound from oozing out of the adhesive layer. When the lower limit value is more than the above value, it becomes easy to improve the adhesion (or adhesion) of the adhesive layer to the metal layer, the glass substrate, etc. It is advantageous to improve peel resistance and the like.

The adhesive composition may further contain an antistatic agent.

Examples of the antistatic agent include a surfactant, a siloxane compound, a conductive polymer, and an ionic compound. The ionic compound is preferred. As an ionic compound, a usual person is mentioned. Examples of the cationic component constituting the ionic compound include organic cations and inorganic cations. Examples of the organic cation include a pyridine cation, a pyrrolidine cation, a piperidine cation, an imidazole cation, an ammonium cation, a sulfonium cation, and a sulfonium cation. Examples of the inorganic cation include alkali metal cations such as lithium cations, potassium cations, sodium cations, and cesium cations, and alkaline earth metal cations such as magnesium cations and calcium cations. In particular, from the viewpoint of compatibility with (meth) acrylic resins, pyridine cations, imidazole cations, pyrrolidine cations, lithium cations, and potassium cations are preferred. As the anion component constituting the ionic compound, either an inorganic anion or an organic anion may be used, and an anion containing a fluorine atom is preferable at the point of the antistatic function. Examples of the anion component containing a fluorine atom include a hexafluorophosphate anion (PF _6- ), a bis (trifluoromethanesulfonyl) phosphonium imide anion [(CF ₃ SO ₂ ) ₂ N-], and a bis (fluorosulfonic acid) (Fluorenyl) fluorenimine anion [(FSO ₂ ) ₂ N-], tetrakis (pentafluorophenyl) borate anion [(C ₆ F ₅ ) ₄ B-], and the like. These ionic compounds can be used alone or in combination of two or more. In particular, bis (trifluoromethanesulfonyl) fluorenimide anion [(CF ₃ SO ₂ ) ₂ N-], bis (fluorosulfonyl) sulfenimide anion [(FSO ₂ ) ₂ N-], tetrakis ( A pentafluorophenyl) borate anion [(C ₆ F ₅ ) ₄ B-] is preferable.

An ionic compound which is a solid at room temperature in terms of the antistatic function of the adhesive layer formed of the adhesive composition over time is preferable.

The content of the antistatic agent is, for example, 0.01 to 20 parts by mass, more preferably 0.1 to 10 parts by mass, and even more preferably 1 to 7 parts by mass, with respect to 100 parts by mass of the (meth) acrylic resin (A).

The adhesive composition may contain additives such as one or more solvents, cross-linking catalysts, tackifiers, plasticizers, softeners, pigments, rust inhibitors, inorganic fillers, light-scattering fine particles, and the like.

An example of the optical film with an adhesive layer of this invention is shown in FIG.

As shown in FIG. 1, at least one side of the optical film 1 of the present invention has an adhesive film with an adhesive layer 2 attached to the optical film, and the surface of the optical film 1 opposite to the surface where the adhesive layer is bonded is also Laminateable separation film (release film) 3. This separation film is usually peeled and removed when the optical film with an adhesive layer is used (for example, when a liquid crystal cell or a retardation film is laminated). The separator may be, for example, a surface on which an adhesive layer is formed on a film of a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyarylate. Polysilicon Oxygen treatment plasma treatment.

An example of the layer structure of the optical laminated body containing the optical film concerning this invention is shown to FIG. 2 thru | or FIG.

The optical laminate 10A shown in FIG. 2 is an optical laminate including a protective film 4, an adhesive layer 5, a polarizing film 6, an adhesive layer 5, an optical film 1 of the present invention, and an adhesive layer 7.

The optical laminate 10B shown in FIG. 3 is an optical laminate including the optical film 1, the adhesive layer 5, the polarizing film 6, the adhesive layer 5, the protective film 4, and the adhesive layer 7 of the present invention.

The optical laminated body 10C shown in FIG. 4 and the optical laminated body 10D shown in FIG. 5 include a protective film 4, an adhesive layer 5, a polarizing film 6, an adhesive layer 5, an optical film 1 of the present invention, and an adhesive layer. 7. Optical laminated body of optical film 40, adhesive layer 7a, and light emitting element 30 (liquid crystal cell, OLED cell).

In the adhesive layer of the optical film with an adhesive layer of the present invention, optical films such as a retardation film, a polarizing film, and a window film can also be laminated.

The retardation film is an optical film showing optical anisotropy, and examples thereof include polyvinyl alcohol, polycarbonate, polyester, polyarylate, polyimide, polyolefin, polycycloolefin, and polystyrene. Polymer membranes made of fluorene, polyfluorene, polyetherfluorene, polyvinylidene chloride / polymethyl methacrylate, ethyl cellulose, ethylene-vinyl acetate copolymer saponification, polyvinyl chloride, etc. A stretched film obtained by stretching about 1.01 to 6 times. Among these, a polymer film of a uniaxially stretched or biaxially stretched polycarbonate film or a cycloolefin-based resin film is more preferable. In addition, in this specification, the retardation film includes a zero retardation film, and also includes films such as a uniaxial retardation film, a low photoelasticity retardation film, and a wide viewing angle retardation film.

Films that express optical anisotropy by coating and alignment of liquid crystalline compounds or films that exhibit optical anisotropy by coating of inorganic layered compounds are called films with temperature-compensated retardation films. Examples include "NH FILM" (trade name; rod-shaped liquid crystal tilt-aligned film) sold by JX Nippon Nissei Energy Co., Ltd., and "WV FILM" (trade name; round) Film with oblique alignment of disc-shaped liquid crystal), "VAC FILM" (trade name; fully biaxially oriented film) sold by Sumitomo Chemical Co., Ltd., "new VAC FILM" (commodity sold by Sumitomo Chemical Co., Ltd.) Name; biaxially oriented film) and so on.

Called zero retardation film, a front retardation R _e refers to the thickness direction retardation R _th, are all 15nm, an optical film to the upper direction is -15. Examples of the zero retardation film include a resin film composed of a cellulose-based resin, a polyolefin-based resin (such as a chain polyolefin-based resin, a polycycloolefin-based resin, or the like) or a polyethylene terephthalate-based resin. It is easy to adjust the retardation value and obtain a point easily, and it is preferable that it is a cellulose resin or a polyolefin resin. Zero retardation film can be used as a protective film. Examples of the zero-retardation film include "Z-TAC" (trade name) sold by Fujifilm Corporation, "ZEROTAC (registered trademark)" sold by Konica Minolta Optical, and ZEON (Japan) "ZF-14" (trade name) sold by the company.

In the optical film of the present invention, the retardation film is preferably a retardation film formed by curing a polymerizable liquid crystal compound.

A film exhibiting optical anisotropy by coating and alignment of a liquid crystal compound, for example, a first form: a phase difference film in which a rod-shaped liquid crystal compound is aligned to a supporting substrate in a horizontal direction, and a second form: a rod-shaped liquid crystal compound pair Phase retardation film in which the support substrate is aligned in a vertical direction, a third aspect: a phase difference film in which the rod-like liquid crystal compound spirally changes the direction of the alignment in a plane, and a fourth aspect: a phase difference in which the disc-shaped liquid crystal compound is obliquely aligned Film, Fifth Aspect: A biaxial retardation film in which the discotic liquid crystal compound is aligned in a vertical direction to the supporting substrate.

For example, as an optical film used in an organic electroluminescent display, the first aspect, the second aspect, and the fifth aspect are suitably used. Moreover, these laminated layers can also be used.

The retardation film may include a polymer-containing layer in the aligned state of the polymerizable liquid crystal compound (hereinafter referred to as a “optically anisotropic layer”). The retardation film is preferably one having a reverse wavelength dispersibility. The so-called inverse wavelength dispersion refers to an optical characteristic in which the retardation value in a short-wavelength liquid crystal alignment plane is smaller than the retardation value in a long-wavelength liquid crystal alignment plane. It is preferable that the retardation film satisfy the following formula (7) and Equation (8). In addition, Re (λ) represents an in-plane phase difference value for light having a wavelength of λ nm.

Re (450) / Re (550) ≦ 1 (7)

1 ≦ Re (630) / Re (550) (8)

In the case of the optical film of the present invention, the retardation film is the first form and has inverse wavelength dispersibility. Since the coloration during black display of the display device is reduced, it is more preferable. In the foregoing formula (7), 0.82 ≦ Re (450) / Re (550) ≦ 0.93. Furthermore, 120 ≦ Re (550) ≦ 150 is preferable.

Examples of the polymerizable liquid crystal compound in the case where the retardation film is a film having an optically anisotropic layer include "3.8.6" in the LCD Handbook (edited by the LCD Handbook Editorial Board, issued by Maruzen Co., Ltd. on October 30, 2012). "Network (fully crosslinked)", compounds having polymerizable groups among the compounds described in "6.5.1 Liquid crystal material b. Polymerizable nematic liquid crystal material", and Patent Publications Nos. 2010-31223 and 2010-270108 The polymerization described in JP 2011-6360, JP 2011-207765, JP 2011-162678, JP 2016-81035, International Publication 2017/043438, and JP 2011-207765 Liquid crystal compound.

A method for producing a retardation film from a polymer in an aligned state of a polymerizable liquid crystal compound includes, for example, a method described in Japanese Patent Application Laid-Open No. 2010-31223.

In the second aspect, adjust the front phase difference value R _e (550) to be in the range of 0 to 10 nm, and more preferably in the range of 0 to 5 nm. Adjust the phase difference value R _{th in the} thickness direction to be in the range of -10 to -300 nm. The range of -20 to -200 nm is more desirable. The retardation value R _{th in} the thickness direction, which represents the anisotropy of the refractive index in the thickness direction, can be calculated from the retardation value R ₅₀ and the in-plane retardation value R ₀ measured from the in-plane fast axis as an inclined axis and inclined at 50 degrees. . That is, the thickness direction retardation value R _TH, from the in-plane retardation value R _0, the fast axis as the inclination axis _50, the thickness d and the retardation film 50 of the retardation film measured retardation value R of the inclined The average refractive index n ₀ can be calculated from the following formulae (10) to (12), and n _x , n _y and n _{z are obtained} , and these are taken into the formula (9).

R _th = [(n _x + n _y ) / 2-n _z ] × d (9)

R ₀ = (n _x -n _y ) × d (10)

R ₅₀ = (n _x -n _y ') × d / cos ( ) (11)

(n _x + n _y + n _z ) / 3 = n ₀ (12)

Here, = sin ^-1 [sin (40 °) / n ₀ ]

n _y '= n _y × n _z / [n _y ² × sin ² ( ) + n _z ² × cos ² ( )] ^1/2

The retardation film may be a multilayer film having two or more layers. For example, a one-sided or two-area-layer protective film of a retardation film, or two or more retardation films are laminated | stacked via an adhesive agent or an adhesive agent.

In the case where the optical film 40 is a multilayer film in which two or more retardation films are laminated, as shown in FIG. 4 as a configuration of the optical laminated body including the optical film of the present invention, it may be exemplified that A quarter-wavelength retardation layer 50 with a wavelength difference of 1/4 wavelength and a half-wavelength retardation layer 70 with a half-wavelength phase difference of transmitted light are passed through an optical film 40 laminated with an adhesive or an adhesive 60 Make up. In addition, as shown in FIG. 5, a configuration of an optical film 40 including a quarter-wavelength retardation layer 50 and a positive C layer 80 and an adhesive layer or an adhesive layer is exemplified.

The 1/4 wavelength retardation layer 50 that provides a phase difference of 1/4 wavelength portion and the 1/2 wavelength retardation layer 70 that provides a phase difference of 1/2 wavelength portion to the transmitted light in FIG. 4 may be the first described above. The optical film of this form may be the optical film of the said 5th form. In the case of the configuration shown in FIG. 4, at least one of them is more preferably the fifth embodiment.

In the case of the structure shown in FIG. 5, it is preferable that the quarter-wave retardation layer 50a is the optical film of the first embodiment described above, and it is more preferable to satisfy the expressions (7) and (8).

The polarizing film is a film having the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis). For example, a dichroic pigment can be used for alignment. Film for polyvinyl alcohol resin film. Examples of the dichroic dye include iodine and a dichroic organic dye.

Usually, a polyvinyl alcohol-based resin film-maker uses a raw material film as a polarizing film. The polyvinyl alcohol resin can be formed into a film by a known method. The thickness of the raw material film is usually 1 to 150 μm, and considering the ease of stretching, etc., it is preferably 10 μm or more.

Regarding the polarizing film, for example, a step of uniaxially stretching the raw film, a step of dyeing the film with a dichroic dye to adsorb the dichroic dye, a step of treating the film with a boric acid aqueous solution, and a step of washing the film are finally performed. Made dry. The thickness of the polarizing film is usually 1 to 30 μm, and from the viewpoint of thinning, it is preferably 20 μm or less, more preferably 15 μm or less, and particularly 10 μm or less.

A polarizing film made of a dichroic pigment adsorbed and aligned with a polyvinyl alcohol-based resin film, except that a separate film of a polyvinyl alcohol-based resin film is used as a raw film, and the film is subjected to uniaxial stretching treatment and dichroic dyeing treatment. In addition to the method (method (1)), the base film is coated with a coating solution (aqueous solution, etc.) containing a polyvinyl alcohol resin and dried to obtain a base film having a polyvinyl alcohol resin layer. A method (method (2)) of subjecting the stretched polyvinyl alcohol-based resin layer to a uniaxially stretched base film and applying a dichroic dye to the stretched polyvinyl alcohol-based resin layer and then peeling and removing the base film can also be obtained. As the base film, a film made of a thermoplastic resin can be used. It is preferably a polyester resin such as polyethylene terephthalate, a polycarbonate resin, a cellulose resin such as triethyl cellulose, or the like. A film composed of a cyclic polyolefin resin such as a norbornene resin, a polystyrene resin, or the like. When the method (2) is used, the production of a thin film polarizing film becomes easy, and for example, the production of a polarizing film 2 having a thickness of 7 μm or less can be easily performed.

It is preferable to provide a protective film on at least one side of the polarizing film via an adhesive.

As the adhesive, a conventional adhesive is used, and it may be an aqueous adhesive or an active energy ray-curable adhesive.

Examples of the water-based adhesive include a commonly used water-based adhesive (for example, an adhesive composed of an aqueous solution of a polyvinyl alcohol resin, an aqueous two-liquid amine ester emulsion adhesive, an aldehyde compound, an epoxy compound, a melamine-based compound, a hydroxyl group, and the like. Methyl compounds, isocyanate compounds, amine compounds, cross-linking agents such as polyvalent metal salts, etc.). Among these, a water-based adhesive composed of a polyvinyl alcohol-based resin aqueous solution can be suitably used. In addition, in the case of using an aqueous adhesive, it is preferable to perform a drying step in order to remove the water contained in the aqueous adhesive after the polarizing film and the protective film are bonded. After the drying step, a aging step may be performed, for example, at a temperature of about 20 to 45 ° C.

The above-mentioned active energy ray-curable adhesive refers to an adhesive that is cured by active energy rays such as ultraviolet rays or electron rays, and examples thereof include a curable composition containing a polymerizable compound and a photopolymerization initiator, The curable composition of a photo-reactive resin, the curable composition containing a binder resin, and a photo-reactive cross-linking agent, and the like are more preferably an ultraviolet-curable adhesive.

In the case of using an active energy ray-curable adhesive, after the polarizing film and the protective film are bonded, a drying step is performed as required, and then the active energy ray-curable adhesive is hardened by irradiating the active energy ray. The light source of the active energy ray is not particularly limited, and is preferably an ultraviolet ray having a light emission distribution at a wavelength of 400 nm or less.

As a method of bonding a polarizing film and a protective film, for example, a method of performing a surface activation treatment such as saponification treatment, corona treatment, and plasma treatment on the bonding surface of at least one of these. When a resin film is bonded to both sides of a polarizing film, the adhesive for bonding these resin films may be the same kind of adhesive or different kinds of adhesives.

As a preferable structure of a polarizing plate, a polarizing plate with which a protective film is laminated | stacked on the surface of at least one side of a polarizing film via an adhesive agent. In the case where the protective film is laminated only on one side of the polarizing film, it is preferable to laminate the protective film on the viewing side. The protective film laminated on the viewing side is preferably a protective film composed of a triethylfluorene-based cellulose resin or a cycloolefin-based resin. The protective film may be an unstretched film or may have a retardation extending in any direction. The surface of the protective film laminated on the viewing side can be provided with a surface treatment layer such as a hard coat layer and an anchor layer.

In the case where the protective film is laminated on both sides of the polarizing film, the protective film on the panel side (the side opposite to the viewing side) is preferably composed of a triethyl cellulose resin, a cycloolefin resin, or an acrylic resin. Protective film or retardation film. The retardation film may be a zero retardation film described later.

Between the polarizing plate and the panel, other layers or films may be further laminated. When a circular polarizing plate for an organic EL display is used, a laminated retardation layer having a 1 / 4-wavelength retardation layer and a 1 / 2-wavelength retardation layer, and a 1 / 4-wavelength layer with reverse wavelength dispersibility described later are preferable. . From the viewpoint of thinning, the retardation layer is preferably a liquid crystal-based retardation film.

The light-condensing film is intended for users for the purpose of controlling the light path, and may be a cymbal film, a lens array film, a sheet with dots, and the like.

The brightness enhancement film is used for the purpose of improving the brightness of a liquid crystal display device using a polarizing plate. Specifically, a plurality of thin film laminates having mutually different refractive index anisotropy can be listed, a reflective polarizing separation sheet designed to generate anisotropy of reflectance, an alignment film of a cholesteric liquid crystal polymer, or an alignment liquid crystal layer thereof supported on a substrate. A circularly polarized light separator on a film.

The term “window film” refers to a front panel of a flexible display device such as a flexible display, and is generally disposed on the outermost surface of the display device. Examples of the window film include a resin film made of a polyimide resin. The window film may be, for example, a resin film including polyimide and silicon oxide, and may be a mixed film of an organic material and an inorganic material. In addition, the window film may be provided on the surface with a hard coat layer to impart surface hardness, stain resistance, and fingerprint resistance. For example, the film etc. which are described in Unexamined-Japanese-Patent No. 2017-94488 are mentioned.

The optical film of the present invention can be used as a protective film for a polarizing plate.

In the polarizing plate, as described above, a protective film is laminated on one or both sides of the polarizing film via an adhesive. For a polarizing plate with a two-layer protective film for a polarizer, the optical film of the present invention can be used on a single-sided protective film of the polarizer, and the optical film of the present invention can also be used as a protective film on both sides. Further, a polarizing plate using the optical film of the present invention as a protective film of a polarizing plate can be laminated with other optical films through an adhesive layer or an adhesive layer. Examples of the laminated body are shown in FIGS. 2 and 3.

The adhesive layer 5 is a layer formed by a conventional adhesive. The conventional adhesive may be an aqueous adhesive or an active energy ray-curable adhesive. The adhesive layer 6 may be a layer formed by the foregoing adhesive, or may be a layer formed by other conventional adhesives.

Examples of the protective film 4 include conventional thermoplastic resin films. The protective film 4 may also be an optical film of the present invention.

The optical film of the present invention can be suitably used for a liquid crystal display device.

    [Example]    

Hereinafter, the present invention will be described more specifically by showing examples and comparative examples, but the present invention is not limited to these examples. In the examples, the content and percentage used are% and parts. Unless otherwise stated, they are based on mass.

    <Synthesis of Light-Selective Absorptive Compounds>         [Synthesis Example 1] Synthesis of light selective absorbing compound (1)    

A 200 ml four-neck flask equipped with a Dimroth cooling pipe and a thermometer was placed in a nitrogen atmosphere, and 10 g of a compound represented by formula (aa) synthesized by reference to patent literature (Patent Laid-Open Patent Application No. 2014-194508) and acetic anhydride (Wako Pure 3.6 g, manufactured by Yakko Pharmaceutical Co., Ltd., 6.9 g of 2-ethylhexyl cyanoacetate (manufactured by Wako Pure Chemical Industries, Ltd.) and 60 g of acetonitrile (manufactured by Wako Pure Chemical Industries, Ltd.), and stirred with a magnetic stirrer. At an internal temperature of 25 ° C, 4.5 g of DIPEA (manufactured by Tokyo Chemical Industry Co., Ltd.) was dropped from the dropping funnel for 1 hour, and after completion of the dropping, the temperature was maintained at 25 ° C for another 2 hours. After completion of the reaction, the acetonitrile was removed using a reduced-pressure evaporator, and the mixture was supplied to column chromatography (silica gel) for purification. The effluent containing the light-selective absorbing compound (1) represented by the formula (aa1) was removed using a reduced-pressure evaporator. Solvent to give yellow crystals. This crystal was dried under reduced pressure at 60 ° C to obtain 4.6 g of a light-selective absorbing compound (1) as a yellow powder. The yield is 50%.

When the ¹ H-NMR analysis was performed, the following peaks were observed, and it was confirmed that the light selective absorbing compound (1) was produced.

¹ H-NMR (CDCl3) δ: 0.87-0.94 (m, 6H), 1.32-1.67 (m, 8H), 1.59-1.66 (m, 2H), 2.09 (quin, 2H), 3.00 (m, 5H), 3.64 (t, 2H), 4.10 (dd, 2H), 5.52 (d, 2H), 7.87 (d, 2H)

    <Determination of gram absorption coefficient ε>    

In order to measure the gram absorption coefficient of the obtained light-selective absorbing compound (1), the light-selective absorbing compound (1) was dissolved in 2-butanone. The obtained solution (concentration: 0.007 g / L) was put into a 1 cm quartz cell, and the quartz cell was set in a spectrophotometer UV-2450 (manufactured by Shimadzu Corporation), and the two-beam method was used at 300 nm to 800 nm at 1 nm intervals. In the wavelength range, the absorbance was measured. From the value of the obtained absorbance, the concentration of the light-absorbing compound in the solution, and the optical path length of the quartz cell, the gram absorbance coefficient at each wavelength was calculated using the following formula.

ε (λ) = A (λ) / CL

[Where ε (λ) represents the gram absorption coefficient L / (g.cm) of a compound with a wavelength of λ nm, A (λ) represents the absorbance at a wavelength of λ nm, C represents the concentration g / L, and L represents the light in a quartz cell Path length. ]

Regarding the gram absorption coefficient of the light-selective absorbing compound (1), the value of ε (405) is 47 L / (g.cm), the value of ε (440) is 0.1 L / (g.cm) or less, and ε (405) The value of / ε (440) is 80 or more.

    [Synthesis Example 2] Synthesis of light selective absorbing compound (2)    

In a 200-ml four-necked flask equipped with a Dimroth cooling tube and a thermometer, in a nitrogen atmosphere, 10 g of a compound represented by formula (aa) synthesized by referring to a patent document (Patent Publication No. 2014-194508), 3.6 g of acid anhydride (manufactured by Wako Pure Chemical Industries, Ltd.), 10 g of 2-butyloctyl cyanoacetate (manufactured by Wako Pure Chemical Industries, Ltd.) and 60 g of acetonitrile (manufactured by Wako Pure Chemical Industries, Ltd.) were stirred with a magnetic stirrer. At an internal temperature of 25 ° C, 4.5 g of DIPEA (manufactured by Tokyo Chemical Industry Co., Ltd.) was dropped from the dropping funnel for 1 hour, and after completion of the dropping, the temperature was maintained at 25 ° C for another 2 hours. After the reaction was completed, acetonitrile was removed using a reduced-pressure evaporator, and the solution was supplied to column chromatography (silica gel) for purification. The effluent containing the compound represented by the formula (aa2) was removed by using a reduced-pressure evaporator to obtain yellow crystals. This crystal was dried under reduced pressure at 60 ° C to obtain 4.6 g of a compound (light selective absorbing compound (2)) represented by the formula (aa2) as a yellow powder. The yield was 56%.

When the absorbance coefficient was obtained by the same method as above, the value of ε (405) of the compound represented by formula (aa2) was 45 L / (g.cm), and the value of ε (420) was 2.1 L / (g.cm).

    <Production of Optical Film>         [Example 1] Production of optical film (1)    

Cellulose triacetate (degree of substitution with ethyl acetate: 2.87; Fujifilm Wako Pure Chemical Industries, Ltd. trade name "cellulose triacetate") and light-selective absorbing compound (1) (relative to cellulose triacetate 100 A mass fraction of 3 parts by mass) and a solvent (a mixture of dichloromethane and ethanol, a mass ratio of 87:13) of a cellulose trioxide solution (solid content concentration: 10% by mass) are put into a mixing tank and stirred, Dissolve the ingredients.

The obtained dissolved matter was uniformly poured on a glass support using an applicator, and dried in an oven at 40 ° C for 10 minutes, and then dried in an oven at 80 ° C for 10 minutes. After drying, the optical film (1) was peeled from the glass support to obtain an optical film (1) having a light selective absorption ability. The thickness of the dried optical film (1) was 30 μm.

    <Measurement of storage elastic modulus>    

The obtained optical film (1) was cut into a size of 5 mm × 30 mm. A dynamic viscoelasticity measuring device "DVA-220" made by IT Measurement Control Co., Ltd. was used so that the long sides of the light-selective absorbing layer (A-1) after cutting became the stretching direction at intervals of 2 cm. The frequency of stretching and contraction was set to 10 Hz, and the temperature of the heating was 10 ° C./minute, and the storage elastic modulus E ′ at a temperature of 23 ° C. to 200 ° C. was obtained. The storage elastic modulus E 'at 23 ° C was 4100 MPa.

    [Example 2] Production of optical film (2)    

Cellulose triacetate (degree of substitution of ethyl acetate: 2.87; Fujifilm Wako Pure Chemical Industries, Ltd. trade name "cellulose triacetate") and light-selective absorbing compound (2) (100 mass of cellulose triacetate) 2 parts by mass) and a cellulose sulfide solution (solid content concentration: 5% by mass) composed of a solvent (a mixture of dichloromethane and ethanol, a mass ratio of 90:10) was put into a mixing tank, stirred, and dissolved Ingredients.

The obtained dissolved matter was uniformly poured on a glass support using an applicator, and dried in an oven at 40 ° C for 10 minutes, and then dried in an oven at 80 ° C for 10 minutes. After drying, the optical film (2) was peeled from the glass support to obtain an optical film (2) having a light selective absorption ability. The thickness of the dried optical film (2) was 20 μm. When the storage elastic modulus of the obtained optical film (2) was measured in the same manner as described above, the storage elastic modulus E 'at 23 ° C was 3800 MPa.

    <Synthesis of (meth) acrylic resin>         [Synthesis example 3]    

In a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer, and a stirrer, 81.8 parts of ethyl acetate as a solvent, 70.4 parts of butyl acrylate as a monomer, 20.0 parts of methyl acrylate, and 2-phenoxyethyl acrylate were placed. A solution obtained by mixing 8.0 parts of ester, 1.0 part of 2-hydroxyethyl acrylate, and 0.6 part of acrylic acid. After the air in the reaction vessel was replaced with nitrogen, the internal temperature was 60 ° C. Then, a solution obtained by dissolving 0.12 parts of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining the same temperature for 1 hour, while maintaining the internal temperature at 54 to 56 ° C., ethyl acetate was continuously added to the reaction vessel at a rate of 17.3 parts / hour so that the polymer concentration became approximately 35%. After the internal temperature was maintained at 54 to 56 ° C from the beginning of the addition of ethyl acetate to 12 hours, ethyl acetate was added to adjust the concentration of the polymer to approximately 20% to obtain ethyl acetate of (meth) acrylic resin. Ester solution (1). The weight average molecular weight Mw of the (meth) acrylic resin was 1.39 million, and the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn was 5.32.

The weight-average molecular weight and number-average molecular weight were measured using a GPC device. Four "TSK gel XL (manufactured by Tosoh Co., Ltd.)" and "Shodex GPC KF-802 (manufactured by Showa Denko Corporation)" ) "A total of five are arranged in series and used as a column, using tetrahydrofuran as the eluent, with a sample concentration of 5 mg / mL, a sample introduction amount of 100 μL, a temperature of 40 ° C, and a flow rate of 1 mL / min. Calculated in terms of polystyrene.

    <Synthesis of (meth) acrylic resin adhesive composition (1)>         [Manufacturing example 1]    

To the ethyl acetate solution (1) (resin concentration: 20%) of the (meth) acrylic resin obtained above, a cross-linking agent (CORONATE L, 75% solids) was mixed with 100 parts of the solid content of the solution: Tosoh Co., Ltd.) 0.4 parts and silane compound (Shinyue Chemical Industry Co., Ltd .: KBM-403) 0.4 parts, and then ethyl acetate was added to make the solid content concentration 14% to obtain an adhesive composition (1). In addition, the compounding quantity of the said crosslinking agent is a mass part with respect to an active ingredient.

    The crosslinking agent and silane compound used in Production Example 1 are as follows.    

Crosslinking agent: Ethyl acetate solution of trimethylolpropane adduct of p-tolyl diisocyanate (solid content concentration 75%), and the trade name "CORONATE L" obtained by Tosoh Corporation.

Silane compound: 3glycidoxypropyltrimethoxysilane, trade name "KBM403" obtained by Shin-Etsu Chemical Industry Co., Ltd.

    <Production of Adhesive Layer>         [Manufacturing example 2]    

Using an applicator, the adhesive composition (1) prepared in Production Example 1 was applied to a component composed of a polyethylene terephthalate film subjected to a release treatment so that the thickness after drying was 20 μm. The release-treated surface of the separator [trade name "PLR-382190" obtained by Lintec Co., Ltd.] was dried at 100 ° C for 1 minute to prepare an adhesive layer (1).

    <Synthesis of (meth) acrylic adhesive composition (2)>         [Manufacturing example 3]    

A cross-linking agent (CORONATE L, solid content 75) was mixed with an ethyl acetate solution (1) (resin concentration: 20%) of the (meth) acrylic resin obtained in Synthesis Example 3 based on 100 parts of the solid content of the solution. %: Tosoh Co., Ltd.) 0.4 parts, Silane compound (Shinyue Chemical Industry Co., Ltd .: KBM-403) 0.4 parts, and 2 parts of the light-selective absorbing compound (1) synthesized in Synthesis Example 1, and the solid content concentration becomes Ethyl acetate was added in a 14% manner to obtain an adhesive composition (2). In addition, the compounding quantity of the said crosslinking agent (CORONATE L) is a mass part with respect to an active ingredient.

    <Production of Adhesive Layer (2)>    

Using an applicator, the adhesive composition (2) prepared as described above was applied to a separation film made of a polyethylene terephthalate film subjected to a release treatment in a thickness of 20 μm after drying [Lintec The release-treated surface of the trade name "PLR-382190" obtained by the company is dried at 100 ° C for 1 minute to prepare an adhesive layer (2).

    <Synthesis of (meth) acrylic adhesive composition (3)>         [Manufacturing example 4]    

A pressure-sensitive adhesive composition (3) was obtained in the same manner as in Production Example 3 except that the light-selective absorbing compound was replaced with the light-selective absorbing compound (2).

Using an applicator, the obtained adhesive composition (3) was applied in a thickness of 20 μm after drying to a release film made of a polyethylene terephthalate film subjected to a release treatment [Lintec ( The release-treated surface of the product name "PLR-382190"] obtained by the company was dried at 100 ° C for 1 minute to prepare an adhesive layer (3).

    <Evaluation>         (Example 3)    

After the corona discharge treatment was performed on one side of the optical film (1) obtained in Example 1, the acrylic adhesive produced in Production Example 1 was bonded by a laminator, and the conditions were 23 ° C and 65% relative humidity. The film was aged for 7 days to obtain an optical film with an adhesive. Then, the adhesive-attached optical film was cut into a size of 30 mm × 30 mm and bonded to an alkali-free glass [trade name “EAGLE XG” manufactured by Corning Corporation] to prepare a sample. Using a spectrophotometer (UV-2450: manufactured by Shimadzu Corporation), the prepared sample was measured for absorbance in a wavelength range of 300 to 800 nm. The measured sample was put into a weather resistance tester (Sunshine weather meter; manufactured by Suga Tester Co., Ltd.), and after performing a weather resistance test for 24 hours, the absorbance of the sample taken out was measured again. From the measured absorbance, the absorbance retention of the sample at 405 nm was obtained according to the following formula. The results are shown in Table 1. The closer the absorbance retention rate is to 100%, the more it shows that there is no degradation of the light selective absorption function and good weather resistance. The absorption of alkali-free glass having a wavelength of 405 nm and 440 nm is almost zero. Absorbance retention rate = A (405) after endurance test / A (405) before endurance test × 100

    (Example 4)    

The optical film (2) was evaluated in the same manner as in Example 3 except that the optical film was replaced with the optical film (2) obtained in Example 2. The results are shown in Table 1.

    <Comparative Example 1>    

Except that the corona treatment was performed on one side of a triethyl cellulose cellulose film (trade name “KC4CW” obtained by Konica) with a thickness of 40 μm, and the adhesive layer (2) was attached by a laminator, and was the same as in Example 3. Similarly, evaluation was performed.

    <Comparative Example 2>    

Except that a corona treatment was performed on one side of a triethyl cellulose film (trade name “KC4CW” obtained by Konica) with a thickness of 40 μm, and an adhesive layer (3) was attached by a laminator, and the same as in Example 3 Similarly, evaluation was performed.

The optical film of the present invention has a value of a light absorption capacity (A (405)) in the vicinity of a wavelength of 405 nm, which is 2.0 or more and is good. Therefore, when the optical film of the present invention is laminated on a retardation film or an organic EL element, the optical film of the present invention can shield visible light having a short wavelength near a wavelength of 405 nm, which is incident on the retardation film or the organic EL element, and has retardation retardation. The film or the organic EL element is free from deterioration suppression ability which is deteriorated by short-wavelength visible light. Furthermore, even after the weather resistance test of the optical film of the present invention, the light absorption ability near the wavelength of 405 nm is good, and it has good weather resistance (durability). In addition, the optical film of the present invention has a low light absorption capacity in the vicinity of a wavelength of 440 nm, does not hinder the light emission of the liquid crystal display device, and can exhibit good color performance.

    [Industrial availability]    

The optical film of the present invention is suitable for use in a liquid crystal panel and a liquid crystal display device.

Claims (10)

    An optical film is an optical film formed of a resin composition containing a resin (A) and a light-selective absorbing compound (B); the resin (A) is composed of a cellulose resin, a (meth) acrylic resin, At least one resin selected from the group consisting of polyester resin, polyamide resin, polyimide resin, and cycloolefin resin; the optical film satisfies the following formula (1): A (405) ≧ 0.5 (1) In formula (1), A (405) represents the absorbance at a wavelength of 405 nm.         The optical film according to item 1 of the patent application scope satisfies the following formula (2): A (440) ≦ 0.1 (2) In formula (2), A (440) represents an absorbance at a wavelength of 440 nm.         The optical film described in item 1 or 2 of the scope of patent application, which further satisfies the following formula (3): A (405) / A (440) ≧ 5 (3) In formula (3), A (405) represents The absorbance at a wavelength of 405 nm, A (440) represents the absorbance at a wavelength of 440 nm.         The optical film according to any one of claims 1 to 3 in the scope of patent application, wherein the storage elastic modulus E at 23 ° C is 100 MPa or more.         The optical film according to any one of claims 1 to 4 in the scope of patent application, wherein the content of the light selective absorption compound (B) is 0.01 to 20 parts by mass based on 100 parts by mass of the resin (A).         The optical film according to any one of claims 1 to 5, in which the light selective absorption compound (B) is a compound satisfying formula (4); ε (405) ≧ 20 (4) formula ( In 4), ε (405) represents the gram absorption coefficient of the compound having a wavelength of 405 nm; the unit of the gram absorption coefficient is L / (g · cm).         The optical film according to item 6 of the scope of patent application, wherein the light selective absorption compound (B) is a compound satisfying the formula (5); ε (405) / ε (440) ≧ 20 (5) in the formula (5) Ε (405) represents the gram absorption coefficient of a compound with a wavelength of 405nm; ε (440) represents the gram absorption coefficient of a wavelength of 440nm.         The optical film according to any one of claims 1 to 7, in which the light selective absorption compound (B) is a compound having a merocyanine structure in the molecule.         An optical film with an adhesive is provided with an adhesive layer on at least one side of the optical film according to any one of claims 1 to 8 of the scope of patent application.         A display device includes an optical film with an adhesive as described in item 9 of the scope of patent application.