KR20090048363A - Adhesive composition and optical film - Google Patents

Abstract

[assignment]

The present invention provides an optical film pressure-sensitive adhesive and an optical film that are excellent in durability even in a high-temperature, high-humidity environment, and which can suppress light leakage and can be easily reworked when fixing of the optical film is required.

[Resolution]

Per 100 parts by weight of the acrylic copolymer (A) and the acrylic copolymer (A),

1 to 30 parts by weight of the polyvinyl monomer (B),

0.01 to 5 parts by weight of the crosslinking agent (C),

Pressure-sensitive adhesive composition containing 0.01 to 1 part by weight of tris (3-trialkoxysilylalkyl) isocyanurate (D).

adhesive

Description

Adhesive composition and optical film {ADHESIVE COMPOSITION AND OPTICAL FILM}

This invention relates to the adhesive composition for optical films used for sticking optical films, such as a polarizing film and retardation film, to adherends, such as a liquid crystal cell, and the optical film with the said adhesive. More specifically, the present invention is capable of peeling when the adhesion state is not good when the optical film is adhered to the adherend, exhibiting excellent durability even at high temperature and high humidity, and having characteristics such as light leakage hardly occur. It relates to an adhesive for an optical film having a light, and an optical film having the adhesive.

BACKGROUND ART A liquid crystal display device used in a wide range of fields as a display device is usually a liquid crystal cell, a polarizing film, a retardation film, or a brightness enhancement film sandwiching a liquid crystal component oriented in a predetermined direction between two support substrates such as glass. It consists of optical films, such as these, and an adhesive is often used for lamination | stacking of optical films, and sticking to a liquid crystal cell.

Liquid crystal displays are widely used as display devices for personal computers, televisions, car navigation systems, and the like. Accordingly, there is a demand for an adhesive that is excellent in durability even under use in a harsh environment such as under high temperature and high humidity, that is, does not fall or bubbles are generated even after long use. In addition, in harsh environments such as high temperature and high humidity, the optical film has a large numerical change in shrinkage and expansion. The pressure-sensitive adhesive layer does not relieve the stress caused by this numerical change, and the residual stress of the optical film becomes nonuniform. As a result, a so-called "light leak phenomenon" (hereinafter also referred to as "light leak"), in which light leaks out from the periphery of the liquid crystal display device and becomes white, becomes a problem.

Moreover, in this technical field, when the optical film which has such an adhesive layer is stuck to a to-be-adhered body, when an undesired condition, such as a foreign matter, a position shift, etc. generate | occur | produces, an optical film is peeled off from a to-be-adhered body. Rework is carried out to remove and reattach the new optical film. At this time, when the adhesive strength of the optical film is large, it is difficult to peel the optical film from the adherend, or after peeling the optical film, a part of the adhesive remains on the adherend.

As described above, the pressure-sensitive adhesive used for the optical film is required to be peeled off even when used under high temperature and high humidity, and durability must be adhered to adherends such as liquid crystal cells so as not to generate bubbles. On the other hand, when reworking, a characteristic (hereinafter referred to as reworkability) in which a part of the adhesive does not remain in the adherend is required to be easily peeled off from the adherend. As described above, there is a demand for an adhesive that makes light leakage less likely to occur while achieving conflicting durability and reworkability.

In order to solve the problem, various studies have been made. For example, Japanese Unexamined Patent Application Publication No. 10-279907 discloses a combination of a high molecular weight acrylic copolymer and a low molecular weight acrylic copolymer having a weight average molecular weight of 30,000 or less, and there is a description of durability and light leakage. There is no description, and it is expected that the adherend will be contaminated by the bleed of the low molecular weight copolymer component and the reworkability will deteriorate sufficiently.

In addition, Japanese Patent Application Laid-Open No. 2006-235568 discloses a pressure-sensitive adhesive having excellent durability under high temperature and high humidity by using an active energy pre-cured pressure-sensitive adhesive composition, and having a property of preventing light leakage, but is not described in terms of reworkability. not. The present inventors tested the examples described in the above-mentioned patent publication in the same way, but the obtained pressure-sensitive adhesive was excellent in durability and light leakage, but the adhesive strength after 50 ° C. and 24 hours, which is an index of reworkability, was high, and the reworkability was poor. lost.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-279907

Patent Document 2: Japanese Patent Application Laid-Open No. 2006-235568

An object of the present invention is to provide an optical film adhesive and an optical film which are excellent in durability even under an environment of high temperature and high humidity, and which can suppress light leakage and can be easily reworked when fixing of an optical film is required. do.

MEANS TO SOLVE THE PROBLEM As a result of repeating research so that the said subject might be solved, it turned out that the said subject can be solved by using the ultraviolet curable adhesive which has a specific acrylic resin composition and uses the silane coupling agent of a specific structure. That is, this invention consists of the following structures, in order to solve the said subject.

1. With respect to the acrylic copolymer (A) and 100 parts by weight of the acrylic copolymer (A),

1 to 30 parts by weight of the polyvinyl monomer (B),

0.01 to 5 parts by weight of the crosslinking agent (C),

Adhesive composition containing 0.01-1 weight part of tris (3-trialkoxy silylalkyl) isocyanurate (D).

2. Said adhesive composition of said 1 which further contains 0.001-0.2 weight part epoxy-type silane coupling agent (E) with respect to 100 weight part of acrylic copolymers (A).

3. Acrylic copolymer (A) contains 0.1-10 weight% of hydroxyl-containing monomer and 0.1-3 weight% of carboxyl group-containing monomer as a copolymerization component,

The pressure-sensitive adhesive according to the above 1 or 2, wherein the value obtained by dividing (% by weight of the hydroxyl group-containing monomer contained in the acrylic copolymer (A)) by (% by weight of the carboxyl group-containing monomer included in the acrylic copolymer (A)) is 0.1 to 30. Composition.

4. With respect to an acrylic copolymer (A) and 100 weight part of acrylic copolymers (A),

1 to 30 parts by weight of the polyvinyl monomer (B),

0.01 to 5 parts by weight of the crosslinking agent (C),

An optical film having a pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition containing 0.01 to 1 part by weight of tris (3-trialkoxysilylalkyl) isocyanurate (D).

5. Optical film of said 4 which further contains 0.001-0.2 weight part epoxy-type silane coupling agent (E) with respect to 100 weight part of acrylic copolymers (A).

6. Acrylic copolymer (A) contains 0.1-10 weight% of hydroxyl group containing monomers and 0.1-3 weight% of carboxyl group containing monomers as a copolymerization component, (The hydroxyl group containing monomer contained in an acrylic copolymer (A). (% By weight) divided by (% by weight of the carboxyl group-containing monomer contained in the acrylic copolymer (A)) is 0.1 to 30, the optical film according to the above 4 or 5.

7. After forming the pressure-sensitive adhesive layer, the adhesive force to the alkali free glass plate after 24 hours at 50 ° C is 0.5 to 10 N / 25mm, the adhesive force to the alkali free glass plate after 24 hours at 80 ° C, and 60 ° C, The optical film as described in said 6 whose adhesive force with respect to the alkali free glass plate after 24 hours passes at 90% RH is 10 N / 25 mm or more.

According to the pressure-sensitive adhesive for an optical film and the optical film according to the present invention, it is excellent in durability even under an environment of high temperature and high humidity, and suppresses light leakage, and can be easily reworked when fixing of the optical film is required. A pressure-sensitive adhesive for films and an optical film can be provided.

The adhesive composition which concerns on embodiment of this invention contains an acrylic copolymer (A), a polyvinyl monomer (B), a crosslinking agent (C), and a tris (3-trialkoxy silylalkyl) isocyanurate (D). Include. In the adhesive composition which concerns on this embodiment, the polyvinyl monomer (B) disperse | distributed in an acrylic copolymer (A) is photopolymerized by ultraviolet irradiation, and forms a three-dimensional structure, Furthermore, the crosslinking group in an acrylic copolymer (A) Crosslinking reaction of a crosslinking agent (C) forms the adhesive which has favorable adhesive characteristics.

In this embodiment, as an acrylic copolymer (A), the acrylic ester monomer as a copolymerization component, the methacrylic acid ester monomer (hereafter, the word containing [acryl] and the word containing [methacryl]) are described together in a copolymer. In that case, the (may be described as (meth) acrylic)) means a copolymer containing 80% by weight or more, and a copolymer containing 90% or more by weight of a copolymerization component is preferable.

As a (meth) acrylic acid ester monomer, if it is a monomer which has a (meth) acrylic acid ester structure, it will not specifically limit, For example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate , i-butyl (meth) acrylate, n-octyl (meth) acrylate, i-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-sonyl (meth) acrylate, i-sonyl C1-C18 linear or branched alkyl esters of (meth) acrylic acid, such as (meth) acrylate, n-disyl (meth) acrylate, n-dodecyl (meth) acrylate, and stearyl (meth) acrylate, Furthermore, it is possible to use one kind or two or more kinds of these various derivatives.

An acrylic copolymer (A) can contain monomers other than a (meth) acrylic acid ester monomer as a copolymerization component in the range which does not exceed the definition of an acrylic copolymer (A). As monomers other than a (meth) acrylic acid ester monomer, it is possible to use the diester of saturated fatty acid vinyl ester, an aromatic vinyl monomer, a vinyl cyanide monomer, maleic acid, or formic acid as an example. For example, as a saturated fatty acid vinyl ester, vinyl formate, vinyl acetate, a vinyl propionate, a vinyl basatic acid (brand name), etc. (preferably vinyl acetate); Aromatic vinyl monomers such as styrene, α-methylstyrene, vinyltoluene and the like; Vinyl cyanide monomers such as acrylonitrile, methacrylonitrile; Diesters of maleic acid or formic acid, for example dimethyl maleate, di-N-butyl maleate, di-2-ethylhexyl maleate, di-N-octyl maleate, dimethyl formalate, di-N-butyl Formalate, di-2-ethylhexylfomalate, di-N-octylformalate and the like can be used.

In an acrylic copolymer (A), it is preferable to contain the monomer which has a functional group as a structural component of a copolymer in an acrylic copolymer (A) for the purpose of making an acrylic copolymer (A) and a crosslinking agent (C) react. Moreover, the monomer (meth) acrylic acid ester which has a functional group is also counted as the quantity of the (meth) acrylic acid ester monomer contained as a copolymerization component in an acrylic copolymer (A) at the time of defining an acrylic copolymer.

As a monomer which has a functional group, 1 type, or 2 or more types, such as a carboxyl group containing monomer, a hydroxyl group containing monomer, a glycidyl group containing monomer, an amide group containing monomer, an N-substituted amide group containing monomer, a tertiary amino group containing monomer, etc. It is possible to use.

As a hydroxyl-containing monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth), for example Acrylate, 3-methyl-3-hydroxybutyl (meth) acrylate, 1,1-dimethyl-3-butyl (meth) acrylate, 1,3-dimethyl-3-hydroxybutyl (meth) acrylate, 2,2,4-trimethyl-3-hydroxypentyl (meth) acrylate, 2-ethyl-3-hydroxyhexyl (meth) acrylate, glycerin mono (meth) acrylate, polypropylene glycol mono (meth) acrylic It is possible to use the rate, polyethyleneglycol mono (meth) acrylate, poly (ethyleneglycol-propylglycol) mono (meth) acrylate, N-metholacrylamide, aryl alcohol, methyl alcohol and the like.

Examples of the carboxyl group-containing monomers include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, formic acid, crotonic acid, itaconic acid, citraconic acid, cinnamic acid, monohydroxyethyl (meth) acrylate succinate, and monohydroxy maleic acid. Ethyl (meth) acrylate, monohydroxyethyl (meth) acrylate formate, monohydroxyethyl (meth) acrylate phthalate, 1,2-dicarboxycyclohexane monohydroxyethyl (meth) acrylate, (meth ) Acrylic acid dimer,? -Carboxy-polycaprolactone mono (meth) acrylate, and the like can be used.

As a glycidyl group containing monomer, For example, glycidyl (meth) acrylate, 3, 4- epoxycyclohexylmethyl (meth) acrylate, glycidyl vinyl ether, 3, 4- epoxycyclohexyl vinyl ether, Glycidyl (meth) aryl ether, 3, 4- epoxycyclohexyl (meth) aryl ether, etc. can be used.

As an amide group containing monomer and N-substituted amide group containing monomer, acrylamide, methacrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-methoxymethyl (meth ) Acrylamide, N-ethoxymethyl (meth) acrylamide, N-propoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N-tert-butylacrylamide, N-octyl acrylamide , Diacetone acrylamide and the like can be used.

As the tertiary amino group-containing monomer, it is possible to use dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylateamide and the like.

It is preferable that especially a hydroxyl group containing monomer and a carboxyl group containing monomer are contained in an acryl copolymer (A) as a copolymer component among the monomer which has various functional groups as a copolymer component.

The ratio in which the hydroxyl group-containing monomer is included as the copolymerization component is 0.1% by weight or more, preferably 1% by weight or more, based on the acrylic copolymer (A) for the purpose of increasing the cohesive force of the pressure-sensitive adhesive to improve the durability of the pressure-sensitive adhesive composition. It is done. In addition, the ratio in which a hydroxyl-containing monomer is contained as a copolymer component is 10 weight% with respect to an acrylic copolymer (A) for the purpose of suppressing the fall of the adhesive force of an adhesive composition, and exhibiting durability of the adhesive composition provided practically. Hereinafter, Preferably it is 5 weight% or less.

The ratio in which the carboxyl group-containing monomer is included as the copolymer component is 0.1% by weight or more, preferably 0.2% by weight with respect to the acrylic copolymer (A) for the purpose of increasing the cohesive force of the pressure-sensitive adhesive to improve the durability of the pressure-sensitive adhesive composition. As mentioned above, Especially preferably, it is 0.5 weight% or more. Moreover, the ratio in which the carboxyl group-containing monomer is contained as a copolymer component is 3 weight% or less with respect to an acrylic copolymer (A), Preferably it is 2 weight% or less, especially in order to suppress that the adhesive force of an adhesive composition becomes high too much. Preferably it is 1 weight% or less.

The ratio of the hydroxyl group-containing monomer and the carboxyl group-containing monomer contained in the acrylic copolymer (A) is the weight of the hydroxyl group-containing monomer contained in the acrylic copolymer (A) for the purpose of achieving both durability and reworkability of the pressure-sensitive adhesive composition. It is preferable that the value which divided%) (weight% of the carboxyl group-containing monomer contained in an acrylic copolymer (A)) is 0.1-30.

The weight average molecular weight (Mw) of the acrylic copolymer (A) is 800,000 or more, preferably 1 million or more for the purpose of providing sufficient cohesive force to the pressure-sensitive adhesive composition and suppressing bubble generation. In addition, the weight average molecular weight (Mw) of an acrylic copolymer (A) is 2.5 million or less, Preferably it is 1.8 million or less in order to ensure coating (coating) workability of an adhesive composition.

The weight average molecular weight (Mw) of an acrylic copolymer (A) is the value measured by the following method.

(Measurement method of weight average molecular weight (Mw))

It measures according to following (1)-(3):

(1) An acrylic copolymer (A) solution is apply | coated to a release paper, it is dried for 2 minutes at 100 degreeC, and an acryl copolymer (A) of a film form is obtained.

(2) The acrylic copolymer (A) on the film obtained in the above (1) is dissolved in tetrahydrofuran so as to have a solid content of 0.2%.

(3) Under the following conditions, the weight average molecular weight (Mw) of an acrylic copolymer (A) is measured using gel permeation chromatography (GPC).

(Condition)

GPC: HLC-8220 GPC (manufactured by Higashiso Co., Ltd.)

Column: Use of 4 TSK-GEL GMHXL

Mobile phase solvent: tetrahydrofuran

Flow rate: 0.6 ml / min Column temperature: 40 ℃

The glass transition temperature (Tg) of the acrylic copolymer (A) is -80 ° C or higher, preferably -60 ° C or higher, for the purpose of imparting sufficient cohesive force to the pressure-sensitive adhesive composition and exhibiting sufficient durability. The glass transition temperature (Tg) of the acrylic copolymer (A) is preferably -20 ° C. or lower for the purpose of exhibiting sufficient adhesiveness to the support substrate to the pressure-sensitive adhesive composition and exerting durability without peeling or the like. Preferably, it is below -30 degreeC. In addition, in this embodiment, the glass transition temperature (Tg) of an acrylic copolymer (A) is the value measured by the following measuring method.

(Measuring method of glass transition temperature (Tg))

It measures according to following (1)-(3).

(1) Acrylic copolymer (A) The solution is apply | coated to a release paper, it is dried at 100 degreeC for 2 minutes, and the acrylic copolymer (A) on a film is obtained.

(2) A cylindrical cell having an inner diameter of about 5 mm and a depth of about 5 mm consisting of an aluminum foil having a thickness of about 0.05 mm is weighed and filled with about 10 mg of the sample obtained in (1), and this is used as a measurement sample.

(3) Using a Seiko Electronics Co., Ltd. SSC-5000 type differential scanning calorimeter, the temperature was measured at a temperature increase rate of 10 ° C / min from -150 ° C.

The polymerization method of the acrylic copolymer (A) used in the present embodiment is not particularly limited and can be polymerized by methods such as solution polymerization, emulsion polymerization and suspension polymerization. Moreover, when manufacturing the adhesive composition which concerns on this embodiment using the mixture of the copolymer obtained by superposition | polymerization, it is preferable to superpose | polymerize by solution polymerization so that an adhesive composition can be obtained relatively simple and a short time can be obtained. Do.

For solution polymerization, a predetermined organic solvent, a monomer, a polymerization initiator, and a chain transfer agent used as necessary are put in a polymerization tank, and a method of heating and reacting for several hours while stirring at a reflux temperature of the organic solvent or in an organic solvent is used. It is possible to. Moreover, the molecular weight of the acrylic copolymer (A) which concerns on this embodiment can be made into a desired molecular weight by adjusting reaction temperature, time, a solvent amount, a kind and quantity of a catalyst.

The adhesive composition which concerns on this embodiment contains 1-30 weight part of polyvinyl monomers (B) with respect to 100 weight part of acrylic copolymers (A), and the crosslinking group and crosslinking agent (C) in an acrylic copolymer (A) In addition to the crosslinking reaction), it is possible to photopolymerize the polyvinyl monomer by ultraviolet (UV) irradiation to form a three-dimensional structure. Thereby, it is possible to obtain the adhesive agent with high cohesion force. In addition, in this embodiment, a polyvinyl monomer (B) means the monomer which has some radical vinyl bond.

As a specific example of a polyvinyl monomer (B), for example, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, neopentyl glycol di (meth) Acrylate, 1,6-hexanediol di (meth) acrylate, trimetholpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, divinylbenzene, It is possible to use N, N'-methylenebisacrylamide and the like.

The amount of the polyvinyl monomer (B) used per 100 parts by weight of the acrylic copolymer (A) is 1 part by weight or more, preferably 10 parts by weight for the purpose of suppressing light leakage of the pressure-sensitive adhesive composition and exhibiting sufficient durability. Do as above. In addition, the usage-amount of a polyvinyl monomer (B) with respect to 100 weight part of acrylic copolymers (A) is 30 weight part or less for the purpose of suppressing generation | occurrence | production of peeling in a durability test, and fall of adhesive force, Preferably Shall be 20 parts by weight or less.

In the adhesive composition which concerns on this embodiment, it is preferable to contain a photoinitiator with a polyvinyl monomer (B). As a photoinitiator, it is possible to use the substance which produces a radical by irradiating the ultraviolet-ray of the suitable wavelength which may be a trigger of a polymerization reaction.

As a photoinitiator, benzoin, such as benzoin, benzoin methyl ether, benzoin ethyl ether, o-benzoyl benzoate methyl-p-benzoin ethyl ether, benzoin isopropyl ether, (alpha)-methyl benzoin, for example. , Acetophenones such as benzyl dimethyl ketal, trichloroacetophenone, 2,2-diethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methylpropionphenone, 2-hydroxy-4 Propiophenones such as' -isopropyl-2-methylpropiophenone, benzophenones such as benzophenone, methylbenzophenone, p-chlorobenzophenone and p-dimethylaminobenzopanone, 2-chlorothioxanthone, 2 -Thioxanthones such as ethyl thioxanthone and 2-isopropyl thioxanthone, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, Acylphosphine oxides such as (2,4,6-trimethylbenzoyl)-(ethoxy) -phenylphosphine oxide, benzyl, dibenzo It is possible to use Veron, α- acyl oxime esters. These compounds may be used alone or in combination of two or more compounds.

The amount of the photopolymerization initiator used per 100 parts by weight of the acrylic copolymer (A) is 0.01 parts by weight or more, preferably 0.1 parts by weight or more for the purpose of suppressing light leakage of the pressure-sensitive adhesive composition and exhibiting sufficient durability. . In addition, the usage-amount of a photoinitiator with respect to 100 weight part of acrylic copolymers (A) is 5.0 weight part or less, Preferably it is 2.0 weight for the purpose of suppressing generation | occurrence | production of peeling in a durability test, and fall of adhesive force. It is less than or equal to.

The adhesive composition which concerns on this embodiment contains 0.01-5 weight part of crosslinking agents (C) with respect to 100 weight part of acrylic copolymers (A), and can react with an acrylic copolymer (A), and can form a crosslinked structure. It is formed including the crosslinking agent (C) containing 2 or more functional groups, Preferably it is 2-4 functional groups.

The crosslinking agent (C) is not particularly limited as long as it reacts with the acrylic copolymer (A) to form a crosslinked structure. For example, as a crosslinking agent (C), it is possible to use a polyisocyanate compound, a polyaziridine compound, a polyepoxy compound, a melamine formaldehyde condensate, a metal salt, a metal chelate compound, and the like. Moreover, it is preferable to use a polyisocyanate compound, a poly aziridine compound, and / or a polyepoxy compound from a viewpoint of adhesiveness of an optical film and an adhesive composition, stability after mix | blending with an acrylic copolymer (A), etc. These crosslinking agents (C) can be used individually or in combination of 2 or more types, respectively.

As a polyisocyanate compound, it is possible to use aromatic polyisocyanate, such as xylylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, and triylene diisocyanate, for example. Moreover, as a polyisocyanate compound, it is possible to use aliphatic or alicyclic polyisocyanate, such as hexamethylene diisocyanate, isophorone diisocyanate, and a water additive of an aromatic polyisocyanate compound, for example. Furthermore, it is possible to use polyisocyanate compounds derived from various polyisocyanates such as dimers or trimers of these polyisocyanates or adducts of polyols such as these polyisocyanates with trimetholpropane.

Examples of the polyisocyanate compound include [colonate L], [colonate HX], [colonate HL-S], [colonate 2234] (above Japan Polyurethane Co., Ltd.), and Module N3400 (made by Juwoo Bayer Urethane Co., Ltd.), [Duranate E-405-80T], [Duranate TSE-100] (made by Ukhwa Chemical Co., Ltd.) ), [Takenate D-110N], [Takenate D-120N], and [Takenate M-631N] (above, manufactured by Samjung Electro Chemical Co., Ltd.). It is possible to use.

As the polyaziridine compound, it is possible to use a reaction product of a polyisocyanate compound and ethyleneimine. Moreover, as a polyisocyanate compound, it is possible to use the compound illustrated above. Moreover, it is possible to use the compound which added ethyleneimine to the polyhydric ester, such as polyols, such as a trimethol propane and pentaerythritol, and (meth) acrylic acid, as a crosslinking agent (C) which concerns on this embodiment.

Examples of the polyaziridine compound include N, N'-hexamethylenebis (1-aziridinecarboamide), methylenebis [N- (1-aziridinylcarbonyl) -4-aniline] and tetrameth. It is possible to use tyrolmethane-tris (β-aziridinylpropionite), trimetholpropane-tris (β-aziridinylpropionite), and the like. Here, among these polyaziridine compounds, for example, [TAZO], [TAZM] (above Mutual Pharmaceutical Co., Ltd. make), [Chemite PZ-33] (Japan catalyst) It is possible to use the polyaziridine compound marketed under brand names, such as these.

As a polyepoxy compound, for example, ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl Ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polytetramethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol Triglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, resorcin diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, trimetholol propane triglycidyl Dyl ether, pentaerythritol polyglycidyl ether, sorbitol polyglycidyl ether, adipic acid diglycidyl ester, phthalic acid diglycidyl ester, tris Cydyl) isocyanurate, tris (glycidoxyethyl) isocyanurate, 1,3-bis (N, N-glycidylaminomethyl) cyclohexane, N, N, N'N'-tetraglyci It is possible to use dill-m-xylylenediamine and the like.

Of the polyepoxy compounds, polyepoxy compounds containing three or more epoxy groups are preferred. For example, tris (glycidyl) isocyanurate, tris (glycidoxyethyl) isocyanurate, 1,3-bis (N, N-glycidylaminomethyl) cyclohexane N, N, N Preference is given to using polyepoxy compounds such as', N'-tetraglycidyl-m-xylylenediamine. In particular, it is preferable to use 1,3-bis (N, N-glycidylaminomethyl) cyclohexane, N, N, N ', N'-tetraglycidyl-m-xylylenediamine. As such a polyepoxy compound, it is possible to use the polyepoxy compound marketed by brand names, such as [TETRAD-C] and [TETRAD-X] (made by Mitsubishi Chemical Corporation), for example.

The amount of the crosslinking agent (C) used per 100 parts by weight of the acrylic copolymer (A) is 0.01 parts by weight or more, preferably 0.5 parts by weight or more for the purpose of providing sufficient cohesive force to the pressure-sensitive adhesive composition and suppressing bubble generation. It is done. The amount of the crosslinking agent (C) used per 100 parts by weight of the acrylic copolymer (A) is 5 parts by weight or less, and preferably 3 parts by weight or less for the purpose of suppressing peeling accompanying excessive cohesion of the pressure-sensitive adhesive composition. do.

The adhesive composition which concerns on this embodiment contains 0.01-1 weight part of tris (3-trialkoxy silyl alkyl) isocyanurate (D) with respect to 100 weight part of acrylic copolymers (A). Tris (3-trialkoxysilylalkyl) isocyanurate (D) is represented by the following general formula (Formula 1). R represents an alkyl group having 1 to 3 carbon atoms, and n is an integer of 1 to 3;

Examples of the tris (3-trialkoxysilylalkyl) isocyanurate (D) include tris (3-trimethoxysilylpropyl) isocyanurate, tris (3-triethoxysilylpropyl) isocyanurate, and the like. It is possible to use.

Content of the tris (3-trialkoxy silylalkyl) isocyanurate (D) in an adhesive composition is 100 weight part of acrylic copolymers (A) for the purpose of suppressing generation | occurrence | production, such as peeling of an adhesive composition and foaming in a moist heat environment. 0.01 to 1 part by weight, preferably 0.1 to 0.5 part by weight.

It is preferable that the adhesive composition which concerns on this embodiment further contains 0.001-0.2 weight part epoxy-type silane coupling agent (E) with respect to 100 weight part of acrylic copolymers (A). As the epoxy silane coupling agent (E), it is possible to use a silane compound having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane and 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. .

The content of the epoxy-based silane coupling agent (E) in the pressure-sensitive adhesive composition is a decrease in reworkability due to the increase in the adhesive force of the pressure-sensitive adhesive composition due to the peeling of the pressure-sensitive adhesive composition under the moist heat environment, the inhibition of foaming, and the change of the pressure-sensitive adhesive composition over time. For the purpose of suppression, the amount is 0.001 to 0.2 parts by weight, preferably 0.01 to 0.05 parts by weight based on 100 parts by weight of the acrylic copolymer (A).

In the adhesive composition which concerns on this embodiment, the above-mentioned acrylic copolymer (A), a polyvinyl monomer (B), a crosslinking agent (C), tris (3-trialkoxy silylalkyl) isocyanurate (D), and an epoxy silane In addition to the coupling agent (E), various additives, solvents, weathering stabilizers, tackifiers, plasticizers, softeners, and the like in amounts not exceeding the effects of the pressure-sensitive adhesive composition according to the present embodiment. It is possible to mix | blend dye, a pigment, an inorganic filler, etc. suitably. As for the range of compounding quantity of a weather resistance stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, 30 weight part or less is preferable with respect to 100 weight part of acrylic copolymers (A), More preferably, Is 20 parts by weight or less, most preferably 10 parts by weight or less. By carrying out a compounding quantity in such a range, the balance of adhesive force, leakage property, heat resistance, and electrodeposition resistance of an adhesive composition can be maintained suitably, and the adhesive composition which shows favorable various physical properties can be obtained. .

The optical film which concerns on this embodiment is an optical film which has an adhesive layer formed from the adhesive composition which concerns on this embodiment. The specific manufacturing method forms the adhesive layer which concerns on this embodiment on a peeling sheet, laminates the adhesive side of the laminated body of this peeling sheet / adhesive layer on an optical film, and turns it into the laminated body of a peeling sheet / adhesive layer / optical film. After irradiating ultraviolet rays from the peeling sheet surface side and peeling the peeling sheet from the laminate, the pressure-sensitive adhesive layer side is pressed against the surface of the support substrate of the liquid crystal cell to be bonded. A more specific method of forming an adhesive layer on a peeling sheet is a method of forming by apply | coating the adhesive composition which concerns on this embodiment on a peeling sheet, and drying.

As the release sheet, it is possible to use a synthetic resin sheet such as polyester which has been subjected to a release treatment with a release agent such as fluorine resin, paraffin, wax or silicone. The thickness of the adhesive layer formed on a peeling sheet is 1-100 micrometers in thickness after drying, Preferably it is 5-50 micrometers, More preferably, it is set as thickness of about 15-30 micrometers.

The pressure-sensitive adhesive composition applied on the release sheet can be dried in a hot air dryer under heating conditions of about 70 to 120 ° C. for about 1 to 3 minutes.

The pressure-sensitive adhesive composition coated on the release sheet is laminated on the optical film, and the pressure-sensitive adhesive layer is formed by irradiating ultraviolet rays from the surface when peeling. Here, as irradiation conditions of an ultraviolet-ray, it is set as about 100-1000mJ / cm <2> of accumulated light quantity in wavelength 300-400nm. And an adhesive bond layer is obtained by irradiating an ultraviolet-ray and photopolymerizing an adhesive composition. Ultraviolet irradiation can use a positive electrode lamp such as a high pressure mercury lamp, a low pressure mercury lamp, a metal hydride, or a nonpolar lamp.

In the adhesive composition for optical films which concerns on this embodiment, the polyvinyl monomer (B) disperse | distributes in an acrylic copolymer (A) by ultraviolet irradiation photopolymerizes, and forms a three-dimensional structure. In the pressure-sensitive adhesive composition for an optical film, the crosslinking group and the crosslinking agent (C) in the acrylic copolymer (A) form a crosslinked structure. After the formation of the three-dimensional structure and the crosslinked structure for the purpose of exhibiting sufficient durability to the pressure-sensitive adhesive composition for optical films and suppressing light leakage by sufficient cohesion, the gel powder in the pressure-sensitive adhesive composition for optical films is formed. Silver is preferably 80% by weight or more, more preferably 90% or more.

In addition, gel powder can be measured by the following method.

(Measurement of Gel Part of Adhesive Composition)

It measures according to following (1)-(6).

(1) The solution of the pressure-sensitive adhesive composition is applied to a release sheet surface-treated with a silicone release agent so that the coating amount after drying is 25 g / m 2, dried in a hot air circulation dryer at 100 ° C. for 90 seconds, and the pressure-sensitive adhesive layer on the film is dried. Form.

(2) The formed pressure-sensitive adhesive layer is cured for 10 days at 23 ° C. and 65% RH humidity.

(3) About 0.25 g of the film-form adhesive layer obtained in (2) is affixed on the fixed 250 mesh wire mesh (100 mm x 100 mm), and it wraps so that a gel may not leak. After that, the weight is accurately measured by precision balance to prepare a sample.

(4) The wire mesh is immersed in ethyl acetate solution for 3 days.

(5) After immersion, the wire mesh is taken out, washed with a small amount of ethyl acetate and dried at 120 ° C for 24 hours. The weight is then measured accurately in precision balance.

(6) The gel powder is calculated by the following formula.

Gel powder (wt%) = (C-A) / (B-A) × 100

However, A is the weight (g) of the wire mesh, B is the weight (adhesive weight) (g) of the wire mesh to which the adhesive is affixed, and C is the weight (gel resin weight) (g) of the dried wire mesh after immersion.

The optical film which concerns on this embodiment is 0.5-10 N / 25mm of adhesive force with respect to the alkali free glass plate after 24 hours progress at 50 degreeC after forming an adhesive layer, and the adhesive force with respect to the alkali free glass plate after 24 hours pass at 80 degreeC. The adhesion to the alkali free glass plate after elapse of 24 hours at, and 60 ° C., 90% RH is 10 N / 25 mm or more.

In the case of reworking after forming an adhesive layer in an optical film, it is reworked immediately, or it is reworked after being stored for a long time in a comparatively favorable environment. Since the adhesive force of the adhesive layer formed from the adhesive which concerns on this embodiment rises, so that it is high temperature, high humidity, if it is 10 N / 25mm or less with respect to the alkali free glass plate after 24 hours at 50 degreeC as mentioned above, it will be easily reworked. This is possible.

On the other hand, when the optical film with the pressure-sensitive adhesive layer is provided in actual use, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer when left unchanged under high temperature and humidity is left unchanged under severe environment of high temperature and high humidity. If the later adhesive force characteristics are good, there will be no problem. Moreover, the adhesive force characteristic of the adhesive when it is left under high humidity and also high temperature is a problem if the adhesive force characteristic after being left to stand at 60 degreeC and 90% of a relative humidity (RH) for 24 hours is favorable. When the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition according to the present embodiment is placed as it is under an environment of high temperature and high humidity, the adhesive force increases, and the adhesive force against an alkali-free glass plate after 24 hours has elapsed at 80 ° C., and at 60 ° C. and 90% RH 24. The adhesion to the alkali free glass plate after the passage of time is 10 N / 25 mm or more. Since the adhesive layer which concerns on this embodiment has a suitable crosslinking state represented by gel powder, peeling and bubble generation | occurrence | production which generate | occur | produced in the conventional adhesive layer under high temperature, high humidity are suppressed by strong adhesive force and cohesion force according to crosslinking. It is more preferable that the adhesive force after leaving for 24 hours in the environment of 80 degreeC after bonding the optical film in which the adhesion layer was formed on the alkali free glass, and leaving it for 24 hours in 90% RH environment at 60 degreeC is 20N / 25mm or more.

(Effect of Embodiment)

Since the adhesive composition which concerns on this embodiment, the adhesive layer formed from this adhesive composition, and the optical film provided with this adhesive layer are equipped with the structure mentioned above, an optical film has sufficient adhesive force with respect to a to-be-adhered body, and is predetermined Since it is suppressed by the adhesive force of, it is excellent in reworkability. When the pressure-sensitive adhesive composition, pressure-sensitive adhesive layer, and optical film according to the present embodiment are placed under an environment of high temperature and high humidity, the adhesive force increases, and the adhesive composition, which is usually generated under high temperature and high humidity, has an appropriate crosslinked state represented by gel powder. There is no peeling and foaming, and it is possible to suppress light leakage.

EXAMPLE

An Example and a comparative example are demonstrated below. In addition, preparation of the test piece used in the Example and the comparative example, various test methods, and the evaluation method are as follows.

(1) Preparation of test optical film

As an example of an optical film, a polarizing film having a pressure-sensitive adhesive layer using a polarizing film was produced. On the release film surface-treated with the silicone type mold release agent, the adhesive composition was apply | coated so that the coating amount after drying might be 25 g / cm <2>. Subsequently, the pressure-sensitive adhesive layer was dried in a hot air circulation dryer at 100 ° C. for 90 seconds. Subsequently, a polarizing base film (laminated with a cellulose triacetate (TAC) film on both sides of a polarizer mainly containing a polyvinyl alcohol (PVA) film); The adhesive layer surface was abutted on the back surface of about 190 mu m] and pressed through a pressurized nip roller. After crimping | bonding, 600mJ / cm <2> ultraviolet-rays were irradiated from the peeling film surface side using the high pressure mercury lamp, and the polarizing film which has the adhesive bond layer cured at 23 degreeC and 65% RH for 10 days was obtained.

(2) Measurement of adhesive force

(2-1) Measurement of adhesive force after standing in an environment of 50 ° C

After cutting the polarizing film produced by [(1) Preparation of test optical film] into 25 mm x 150 mm, this polarizing film piece was cut into an alkali free glass plate [# 1737] made by Corning Corporation using a table laminating machine. It was compressed and subjected to a test sample. This sample was autoclave treated (50 ° C., 5 kg / cm 2, 20 minutes). Subsequently, this sample was left to stand on 23 degreeC and 65% RH conditions for 1 hour, and the process was performed at 50 degreeC for 24 hours. Subsequently, after standing for 1 hour (conditioning treatment) under the conditions of 23 and 65% RH, the adhesive force (peel rate: 300 mm / min) was measured at 180 degree peeling. In addition, in embodiment of this invention and an Example, when [the adhesive force with respect to the alkali free glass plate after 24 hours pass at 50 degreeC after forming an adhesive layer], it means the adhesive force measured by this test method. .

(2-2) Measurement of adhesive force after standing in an 80 ° C environment

After the test sample produced in the same manner as in [(2-1) Measurement of adhesion after standing in an environment at 50 ° C.] and subjected to autoclavage treatment was left at 23 ° C. and 65% RH for 1 hour, 80 ° C. Was treated for 24 hours. Subsequently, after leaving for 1 hour (conditioning treatment) under the conditions of 23 degreeC and 65% RH, adhesive force (peel rate: 300 mm / min) was measured at 180 degree peeling. In addition, in embodiment and the Example of this invention, when [adhesion force to the alkali free glass plate after 24 hours pass at 80 degreeC], it means the adhesive force measured by this test method.

(2-3) Measurement of adhesive force after leaving in an environment of 60 ° C. × 90% RH

After the test sample prepared in the same manner as in [(2-1) Measurement of adhesion force after leaving in 50 ° C. environment] and subjected to autoclave treatment was left at 23 ° C. and 65% RH for 1 hour, 60 24 hours of treatment was performed at 90 degreeC and 90 degreeC. Subsequently, after leaving for 1 hour (conditioning treatment) under the conditions of 23 degreeC and 65% RH, adhesive force (peel rate: 300 mm / min) was measured by 180 degree peeling. In addition, in embodiment and the Example of this invention, when [adhesion force to the alkali free glass plate after 24 hours passes at 60 degreeC and 90% RH], it means the adhesive force measured by this test method.

(3) evaluation of reworkability

The adhesive force was evaluated with respect to the alkali free glass plate after 24 hours passed at 50 degreeC measured by [the measurement of the adhesive force after leaving to stand in (2-1) 50 degreeC environment]. Evaluation criteria are as follows.

◎: 10 N / 23 mm or less.

(Circle): It is larger than 10N / 25mm, and is 15N / 25mm or less.

X: It is larger than 15 N / 25 mm.

(4) evaluation of durability

0.7 mm Corning Co., Ltd. using a 70 mm x 140 mm (long side) test piece cut into a polarizing film having a pressure-sensitive adhesive layer prepared in ((1) Preparation of an optical film for test) so that its long side becomes an angle of 45 ° with respect to the absorption axis. It adhere | attached on the single side | surface of the alkali free glass plate [# 1737] using a laminate. Subsequently, this sample was subjected to autoclave treatment (50 ° C., 5 kg / cm 2, 20 minutes), and left to stand (conditioning treatment) for 24 hours under conditions of 23 ° C. and 65% RH. Then, it was left to stand for 1000 hours under the following temperature and humidity conditions, and the state of foaming, peeling, and moxibustion was visually observed and evaluated. Evaluation criteria are as follows.

a) 80 ℃, dry (80 ℃, dry evaluation standard)

(Double-circle): A flaw of 0.3 mm or more is not seen by foaming, peeling, steaming, and the flaw size from an outer peripheral part.

(Circle): A flaw of 0.9 mm or more is not seen by foaming, peeling, steaming, and the flaw size from an outer peripheral part.

X: A defect of 0.9 mm or more is seen in the size of the defect from foaming, peeling off, steaming, and the outer peripheral end.

b) 60 ° C, 90% RH (60 ° C, 90% RH evaluation criteria)

(Double-circle): A flaw of 0.3 mm or more is not seen by foaming, peeling, steaming, and the flaw size from an outer peripheral part.

(Circle): A flaw of 0.9 mm or more of foaming, peeling, steaming, and the flaw size from an outer peripheral part are not seen.

X: The flaw size of foaming, peeling, steaming, and the flaw size from an outer peripheral part is 0.9 mm or more.

(5) Evaluation test of light leakage phenomenon

The test which affixed the polarizing film which has an adhesive bond layer to the polarizing film which has an adhesive bond layer of the same magnitude | size as ((4) durability evaluation) so that the polarization axis may orthogonally cross on both surfaces of 0.7 mm Corning Corporation's alkali-free glass plate [# 1731]. Samples were made. And after conditioning the same as [(2) Measurement of adhesive force], it was left to stand at 80 degreeC and dry conditions for 500 hours. After standing, light leakage was visually observed using a uniform light source under the conditions of 23 ° C. and 65% RH. Evaluation criteria are as follows.

◎: light leakage is not recognized at all

○: light leakage is hardly recognized

×: large light leakage

(Production of Acrylic Copolymer (A))

(Example 1)

96.2 parts by weight of n-butyl acrylate (BA), 0.6 parts by weight of acrylic acid (AA), 2-hydroxyethyl acrylate (2HEA) 3.2 in a reaction tube equipped with a thermometer, a stirrer, a nitrogen introduction pipe, and a reflux cooling pipe. By weight, 100 parts by weight of ethyl acetate (EAc) and 0.2 part by weight of azobisisobutyronitrile (AIBN) are added, and the air of the reaction vessel is replaced with nitrogen gas. Thereafter, in a nitrogen atmosphere, the contents temperature of the reaction vessel was raised to 65 ° C. for 6 hours under stirring, and further heated to 70 ° C. for 2 hours. Then, the solution which melt | dissolved 0.4 weight part of AIBN in 20 weight part of EAc was dripped over 1 hour, and also it was made to react for 2 hours. After completion of the reaction, the reaction mixture was diluted with toluene to obtain an acrylic copolymer solution having a solid content of 17.7% by weight and a viscosity of 5030 mPa · s. The weight average molecular weight of the acrylic polymer was 1.13 million.

(Manufacture example 2)

Instead of the copolymer composition used in Production Example 1, the polymerization was carried out in the same manner as in Production Example 1 except that the copolymer composition was changed to the monomer composition shown in each Production Example in Table 1. In Table 1, the copolymer composition, solid content, glass transition point (Tg), and weight average molecular weight (Mw) of the manufacture example 2 were shown.

(Manufacture example 3)

Instead of the copolymer composition used in Production Example 1, the polymerization was carried out in the same manner as in Production Example 1 except that the copolymer composition was changed to the monomer composition shown in each Production Example in Table 1. In Table 1, the copolymer composition, solid content, glass transition point (Tg), and weight average molecular weight (Mw) of the manufacture example 3 were shown.

Table 1 Composition and Properties of Acrylic Copolymer (A)

Item Preparation Example 1 Preparation Example 2 Preparation Example 3  Copolymerization composition BA (part by weight) 96.2 98.4 98.5 2 HEA (parts by weight) 3.2 One 0.5 AA (part by weight) 0.6 0.6 One OH / COOH 5.3 1.7 0.5  Characteristic value Solid content (% by weight) 17.7 17.6 19.7 Tg (℃) -54.8 -55.6 -54.9 Mw (only) 131 113 167 Viscosity (mPas) 5030 3800 17500

In Table 1, [OH / COOH] is (weight% of the hydroxyl group-containing monomer contained in the acrylic copolymer (A)) in each production example (the amount of the carboxyl group-containing monomer contained in the acrylic copolymer (A). Weight percent). Specifically, in Production Example 1, [OH / COOH] was 5.3. In Production Example 2, [OH / COOH] was 1.7. Furthermore, [OH / COOH] in Production Example 3 was 0.5.

(Manufacture of the pressure-sensitive adhesive composition for polarizing plates)

(Example 1)

565 weight part (100 weight part of acrylic copolymers) for the acrylic copolymer solution synthesize | combined in manufacture example 1 as an acrylic copolymer (A), 10 weight part of trimetholol propane triacrylates as a polyvinyl monomer (B), a crosslinking agent As (C), it is tris (3-trialkoxy silyl alkyl) isocyanurate (D) as a colonate L4 weight part (polyurethane isocyanate type compound made by Nippon Polyurethanes company, 3 weight part of active ingredients), 0.2 parts by weight of 3-trimethoxysilylpropyl) isocyanurate (Silane Chemical Co., Ltd. silane coupling agent, trade name X-12-965, active ingredient 0.2 parts by weight), epoxy silane coupling agent ( 0.01 parts by weight of 3-glycidoxypropyltrimethoxysilane (E) as a silane coupling agent manufactured by Shinwol Chemical Co., Ltd., trade name: KBM-403, 0.01 parts by weight of an active ingredient, and irgacure as a photopolymerization initiator. 0.3 parts by weight of 500) (photopolymerization initiator manufactured by Chiba Specialty Chemicals Co., Ltd.) , Composition: A 1: 1 (weight ratio) mixture of 1-hydroxycyclohexylphenyl ketone and benzophenone and 0.3 parts by weight of an active ingredient) were sufficiently stirred and mixed to obtain an adhesive composition. Using the obtained adhesive composition, the test optical film is produced by the manufacturing method of the said test optical film, the said various measurements are performed, and the result is shown in Table 3-1.

(Examples 2 to 10, Comparative Examples 1 to 4)

The pressure-sensitive adhesive composition (Examples 2 to 10) was prepared in the same manner as in Example 1, except that the formulations of the Examples and Comparative Examples shown in Tables 2-1 and 2-2 and Comparative Examples were employed instead of the formulations in Example 1. Pressure-sensitive adhesive composition, and pressure-sensitive adhesive composition according to Comparative Examples 1 to 4). Using the obtained adhesive composition, the test optical film was produced by the manufacturing method of the test optical film mentioned above, and the various measurements mentioned above were performed. The results are shown in Table 3-1 and Table 3-2.

Table 2-1 Formulation Composition of Pressure-Sensitive Adhesive Composition

Table 2-2 Formulation Composition of Pressure-Sensitive Adhesive Composition

In addition, in Table 2-1 and Table 2-2, the abbreviation of each compound is as follows, and the addition amount of each component is a weight part of an active ingredient.

(a) TMPTA [trimetholpropane triacrylate]

Polyvinyl monomer (B) component

(b) Colonate L [Polyisocyanate compound made by Japanese Polyurethane Company]

75% active ingredient, crosslinking agent (C)

(c) TMSI; [Silane coupling agent made by Shinwol Chemical Co., Ltd.]

product name; X-12-965, 100% active ingredient

Chemical name; Tris (3-trimethoxysilylpropyl) isocyanurate, tris (3-trialkoxysilylalkyl) isocyanurate (D) component

(d) KBM-403 [Silane coupling agent made by Shinwol Chemical Co., Ltd.]

KBM-403, 100% active ingredient

Chemical name; 3-glycidoxypropyltrimethoxysilane, epoxy silane coupling agent (E) component

(e) KBE-9007 [Silane coupling agent made by Shinwol Chemical Co., Ltd.]

KBE-9007, 100% active ingredient

Chemical name; 3-isocyanatepropyltriethoxysilane

(f) irgacure® 500 [photopolymerization initiator made by Chiba Specialty Chemicals]

Composition: 1: 1 (by weight) eutectic mixture of 1-hydroxycyclohexylphenyl ketone and benzophenone, active ingredient 100%

<Table 3-1 Physical Properties of Optical Film>

<Table 3-2 Physical Properties of Optical Film>

As can be seen from Table 3-1, all the optical films according to Examples 1 to 10 had reworkability, durability (80 ° C.), durability (60 ° C. × 90% RH), and all items of light leakage. Evaluation criteria indicated [◎] or [○]. That is, the optical films according to Examples 1 to 10 are excellent in durability even under an environment of high temperature and high humidity, and can suppress light leakage, and reworking is easily performed when fixing of the optical film is required. It was shown possible.

Moreover, since the optical film which has the adhesive for optical films which concerns on this embodiment and the Example is excellent in reworkability, there is no peeling and bubble generation normally occurring under high temperature, high humidity, and light leakage is suppressed, a personal computer, It is applicable to the optical film used for display apparatuses, such as a television and a car navigation system.

As mentioned above, although embodiment and the Example of this invention were described, embodiment and Example which were described above do not limit invention regarding a claim. It should also be noted that all of the embodiments and combinations of features described in the examples are not limited to those necessary as a means for solving the problems of the invention.

Claims (7)

With respect to an acrylic copolymer (A) and 100 weight part of said acrylic copolymers (A), 1 to 30 parts by weight of the polyvinyl monomer (B), 0.01 to 5 parts by weight of the crosslinking agent (C), Adhesive composition containing 0.01-1 weight part of tris (3-trialkoxy silylalkyl) isocyanurate (D). The method of claim 1, Based on 100 parts by weight of the acrylic copolymer (A), The pressure-sensitive adhesive composition further comprising 0.001 to 0.2 parts by weight of an epoxy silane coupling agent (E). The method according to claim 1 or 2, The said acrylic copolymer (A) contains 0.1-10 weight% of hydroxyl group containing monomers, and 0.1-3 weight% of carboxyl group containing monomers as a copolymerization component, The pressure-sensitive adhesive composition having a value obtained by dividing (% by weight of the hydroxyl group-containing monomer contained in the acrylic copolymer (A)) by (% by weight of the carboxyl group-containing monomer included in the acrylic copolymer (A)). With respect to an acrylic copolymer (A) and 100 weight part of said acrylic copolymers (A), 1 to 30 parts by weight of the polyvinyl monomer (B), 0.01 to 5 parts by weight of the crosslinking agent (C), An optical film having a pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition containing 0.01 to 1 part by weight of tris (3-trialkoxysilylalkyl) isocyanurate (D). The method of claim 4, wherein An optical film further comprising 0.001 to 0.2 parts by weight of an epoxy silane coupling agent (E) based on 100 parts by weight of the acrylic copolymer (A). The method according to claim 4 or 5, The acrylic copolymer (A) contains 0.1 to 10% by weight of a hydroxyl group-containing monomer and 0.1 to 3% by weight of a carboxyl group-containing monomer as a copolymerization component, and includes a hydroxyl group-containing monomer contained in the acrylic copolymer (A). An optical film having a value of 0.1 to 30 divided by (% by weight) by (% by weight of the carboxyl group-containing monomer contained in the acrylic copolymer (A)). The method of claim 6, After forming the pressure-sensitive adhesive layer, the adhesive force to the alkali-free glass plate after the elapse of 24 hours at 50 ℃ is 0.5 ~ 10N / 25mm, the adhesive force to the alkali free glass plate after 24 hours at 80 ℃, and 60 ℃, 90 An optical film having an adhesion force of 10 N / 25 mm or more to an alkali-free glass plate after 24 hours at% RH.