KR20130066143A - Adhesive composition for photopolymerization - Google Patents

Abstract

PURPOSE: An adhesive composition for photopolymerization is provided to prevent curing contraction and to facilitate control of physical properties of an adhesive, such as storage stability, durability, curing degree, and adhesion. CONSTITUTION: An adhesive composition for photopolymerization contains a urethane acrylate-based oligomer, a (meth)acrylate monomer, an epoxy monomer, and a photolatent amidine or amine base generator. The photolatent amidine base generator is a benzylalkyl compound which includes one or more compounds selected from tetramethyl guanidine, diazabicyclononene, and diazabicycloundecene. An adhesive film comprises a transparent substrate film, and an adhesive which is cured material of the adhesive composition formed on one side of the transparent substrate film.

Description

Adhesive composition for photopolymerization {ADHESIVE COMPOSITION FOR PHOTOPOLYMERIZATION}

The present invention relates to a pressure-sensitive adhesive composition for photopolymerization capable of simultaneously performing a radical start system and a base start system.

In general, a liquid crystal display device (LCD) includes a liquid crystal cell and a polarizing plate including liquid crystal, and an appropriate adhesive layer or an adhesive layer for bonding them should be used.

The pressure-sensitive adhesive layer (film) is generally produced by photopolymerizing a composition containing an acrylate or urethane acrylate oligomer and a (meth) acrylate monomer.

However, the composition containing the (meth) acrylate-based compound has a problem that the curing process is too slow at the time of photopolymerization and thus the processability is low.The composition containing the urethane acrylate-based compound has a fast curing process at the time of photopolymerization, but it is used as an adhesive layer such as adhesive force. There is a problem that physical properties are lowered.

In addition, the photopolymerization using the composition containing the (meth) acrylate-based monomer has a large curing shrinkage, the thickness of the pressure-sensitive adhesive layer is non-uniform, the adhesion deteriorates due to durability deterioration and internal stress due to low molecular weight due to oxygen degradation There is a disadvantage.

Thus, photopolymerization using a composition containing an epoxy compound instead of an acrylate compound is presented. Epoxy-based compounds have less hardening shrinkage, so that the internal stress of the pressure-sensitive adhesive layer is stable, thereby improving adhesion to the substrate, and improving physical properties such as improving the hardenability without receiving oxygen inhibition. However, there is a disadvantage in that the storage stability due to moisture is lowered and productivity is lowered due to the dark reaction in which the reaction is performed even in the absence of light after curing.

The present invention can be carried out simultaneously in the radical initiation system and the base initiation system to prevent the reduction of the degree of curing, to prevent curing shrinkage and to control the physical properties of the pressure-sensitive adhesive (storage stability, durability, curing degree, adhesive strength) easy to polymerize the pressure-sensitive adhesive composition To provide.

In order to achieve the above object, the present invention provides a pressure-sensitive adhesive composition for photopolymerization comprising a urethane acrylate oligomer, a (meth) acrylate monomer, an epoxy monomer, and a photolatent amidine or amine base generator.

The photolatent amidine base generator may be a benzylalkyl compound including at least one compound selected from the group consisting of tetramethyl guanidine, diazabicyclononene and diazabicycloundecene.

The photolatent amine base generator may be an α-amino ketone compound including a tertiary amine.

The urethane acrylate oligomer may have a weight average molecular weight of 1,000 to 35,000.

The acrylate monomer may be 1 to 6 functional.

The epoxy monomer may be a glycidyl epoxy monomer.

The urethane acrylate oligomer contains 10 to 80% by weight, 5 to 40% by weight of (meth) acrylate monomer, 5 to 40% by weight of epoxy monomer and 0.1 to 10% by weight of photolatent amidine or amine base generator. can do.

The present invention also provides an adhesive for photopolymerization wherein the adhesive composition is cured.

The present invention also relates to a transparent substrate film; And a pressure-sensitive adhesive formed on one surface of the transparent base film.

The pressure-sensitive adhesive may have a thickness of 25 to 1000 mu m.

The pressure-sensitive adhesive composition of the present invention can be carried out simultaneously in the radical start system and the base start system as one component.

In addition, the pressure-sensitive adhesive composition of the present invention can prevent the decrease in the degree of curing due to the oxygen inhibition of the conventional radical start system, it is easy to prevent hardening shrinkage and to control the physical properties of the pressure-sensitive adhesive (storage stability, durability, degree of curing, adhesive strength).

The present invention relates to a pressure-sensitive adhesive composition for photopolymerization capable of simultaneously performing a radical start system and a base start system.

Hereinafter, the present invention will be described in detail.

The pressure-sensitive adhesive composition for photopolymerization of the present invention contains a urethane acrylate oligomer, a (meth) acrylate monomer, an epoxy monomer, and a photolatent amidine or amine base generator.

The urethane acrylate oligomer serves to provide a balance between cohesive strength and adhesive strength by imparting physical properties and flexibility as an adhesive.

The urethane acrylate oligomer may be one obtained by usually reacting a (meth) acrylate monomer having a polyol, a diisocyanate compound and a hydroxy group. Specifically, a (meth) acrylic monomer having a hydroxy group and a urethane functional group generated by the reaction of the main chain portion, the polyol and the isocyanate compound due to the molecular structure of the polyol is bonded to produce an acryloyl functional group at the terminal.

The polyols include polyols, polyesters, polyolefins, polyacrylates, polycarbonates, polycaprolactones, or polyols having a mixed molecular structure thereof, and among these, in terms of ease of viscosity control and price Polyols, polyesters or polyols having a mixed molecular structure thereof are preferred. For example, when using a cyclic ether polyol such as ethylene oxide, propylene oxide or tetrahydrofuran, a urethane acrylate oligomer having an ether main chain can be prepared. In addition, when using a cyclic ester polyol such as ε-caprolactone or pivalolactone, an oligomer having an ester backbone can be prepared.

As the diisocyanate compound, 1,4-butylene diisocyanate, 1,6-hexamethylene diisocyanate, cyclopentylene-1,3-diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, isophorone diisocyanate , Cyclohexene-1,4-diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-methylenebis (phenylisocyanate), 2,2-diphenylpropane-4,4 '-Diisocyanate, p-phenylenedi isocyanate, m-phenylene diisocyanate, xylene diisocyanate, 1,4-naphthylene diisocyanate, 1,5-naphthylene diisocyanate, 4,4'-diphenyl diisocyanate, azobenzene And aliphatic diisocyanate compounds such as -4,4'-diisocyanate, m- or p-tetramethylxylene diisocyanate, 1-chlorobenzene-2,4-diisocyanate, and these may be used alone or in combination of two or more. It can be mixed and used.

As an acrylic monomer which has a hydroxy group, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate Hydroxyalkylene (2-4) glycol (meth) such as 6-hydroxyhexyl (meth) acrylate, 2 hydroxyethylene glycol (meth) acrylate and 2-hydroxypropylene glycol (meth) acrylate An acrylate etc. are mentioned, These can be used individually or in mixture of 2 or more types.

The manufacturing method of a urethane acrylate oligomer is not specifically limited. For example, a polyol and a diisocyanate compound are reacted in excess in an appropriate equivalence ratio, preferably in order to improve the reaction efficiency, so as to obtain a prepolymer having a urethane group, and the (meth) acrylate monomer having a hydroxy group. By reacting in an appropriate equivalence ratio, a monofunctional urethane acrylate oligomer in which one end is formed with an acryloyl group and the other end is formed with an alcohol group can be prepared. At this time, an appropriate amount of alcohol (eg, butanol) can be added.

The weight average molecular weight (Mw) may be 1,000 to 35,000, preferably 1,000 to 30,000.

The urethane acrylate oligomer is preferably contained in 10 to 80% by weight in 100% by weight of the total pressure-sensitive adhesive composition, more preferably 30 to 60% by weight. If the content is less than 10% by weight, the viscosity of the pressure-sensitive adhesive composition is low, the coating property is not good, if it is more than 80% by weight the viscosity is increased, the processability may be lowered and it is difficult to satisfy the adhesive properties at the same time.

The (meth) acrylate monomer is a monomer having a functional group capable of crosslinking with a urethane (meth) acrylate oligomer while controlling the viscosity of the pressure-sensitive adhesive composition that is solventless.

The kind of the monofunctional (meth) acrylate monomer is not particularly limited, and for example, n-butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl (meth) acrylate, isobutyl (meth) acryl Latex, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ethyl (meth) acrylate, methyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, Pentyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-methylbutyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate , Isoamyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, octadecyl (meth) acrylate, isobornyl (meth) acrylate, 4-methyl-2-pentyl ( Meta) acrylate, dodecyl (meth) acrylate, 2-dodecylthio Ethyl (meth) acrylate, lauryl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl ( Meth) acrylate, hydroxybutyl (meth) acrylate, allyl (meth) acrylate, stearyl (meth) acrylate, phenoxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acrylo Ilmorpholine etc. are mentioned. These can be used individually or in mixture of 2 or more types.

In addition, bifunctional (meth) acrylate monomers, trifunctional (meth) acrylate monomers, or mixtures thereof may be mixed with a monofunctional (meth) acrylate monomer within a range that does not impair the effects of the present invention. have. As the bifunctional (meth) acrylate monomer, 1,3-butanedioldi (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, ethylene glycol di (Meth) acrylate, bisphenol A- ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (Meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dish Clopentenyl di (meth) acrylate, ethylene oxide modified phosphate di (meth) acrylate, bis (2-hydroxyethyl) isocyanurate di (meth) acrylate, di (acryloxyethyl) isocyanu Acrylate, allylated cyclohexyldi (meth) acrylate, dimethyloldicyclopentanedi (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclodecanedimethanol (meth) acrylate, neopentyl Glycol modified trimethylolpropanedi (meth) acrylate, adamantanedi (meth) acrylate, and the like. As the trifunctional (meth) acrylate monomer, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tree (Meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, glycerol Tri (meth) acrylate etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The monofunctional (meth) acrylate monomer is preferably contained in 5 to 40% by weight in 100% by weight of the total pressure-sensitive adhesive composition for photopolymerization, more preferably 10 to 30% by weight. When the content is less than 5% by weight, the curing rate may be lowered. When the content is more than 40% by weight, curing shrinkage may occur seriously and the coatability may be reduced.

Epoxy monomers are cyclic ether compounds of three-membered rings in which oxygen atoms have a bridge structure with vinyl groups, and are classified into glycidyl epoxy compounds and alicyclic epoxy compounds. In consideration of economical efficiency, glycidyl epoxy compounds are preferably used.

Specific examples of the glycidyl epoxy compound include bisphenol A diglycidyl ether, novolac epoxy resins, trisphenol methane triglycidyl ether, 1,4-butanediol diglycidyl ether, and 1,6-hexanediol diol. Glycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, propylene glycol diglycidyl ether and the like.

In addition, the alicyclic epoxy group compound is specifically, 2,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, bis (3,4-epoxycyclohexylmethyl) adipate, 2- (3,4 -Epoxycyclohexyl-5, 5-spiro-3, 4- epoxy) cyclohexanone-meth-dioxane, bis (2, 3- epoxycyclopentyl) ether, etc. are mentioned.

Such an epoxy monomer may be contained in 5 to 40% by weight, preferably 10 to 30% by weight in 100% by weight of the total pressure-sensitive adhesive composition. If the content is less than 5% by weight, there is a problem that the curing rate or storage modulus is too low, and when the content exceeds 40% by weight, the curing rate is slow or the dark reaction proceeds, and the storage modulus is too high so that the adhesion is low.

The photolatent amidine or amine base generator acts as an initiator to generate a radical and a base (cation) at the same time by ring opening by light irradiation. In other words, it serves as a photopolymerization initiator that performs curing of the surface as well as the inside of the coated adhesive composition.

The present invention enables the simultaneous polymerization of a (meth) acrylate monomer polymerized with a radical initiation system and an epoxy monomer polymerized with a base initiation system using the photolatent amidine or amine base generator.

Therefore, it is possible to prevent a decrease in the degree of curing due to oxygen inhibition of the radical initiation system, it is possible to introduce the epoxy monomer, it is easy to prevent the curing shrinkage and to control the physical properties of the pressure-sensitive adhesive.

The photolatent amidine base generator may be a benzylalkyl compound including at least one compound selected from the group consisting of tetramethyl guanidine, diazabicyclononene, diazabicyclo undecene.

The photo-latent amine base generator may be used an α-amino ketone compound containing a tertiary amine.

Such a photolatent amidine or amine base generator may be contained in an amount of 0.1 to 10% by weight, preferably 1 to 5% by weight in a total of 100% by weight of the pressure-sensitive adhesive composition for photopolymerization. If the content is less than 0.1% by weight uncured may occur, if it exceeds 10% by weight may be reduced durability due to the bleed out of the unreacted initiator.

In addition to the components as described above, the adhesive composition is used to adjust the adhesion, cohesion, viscosity, modulus, glass transition temperature, color, etc. required according to the application, adhesiveness imparting resin, silane coupling agent, antioxidant, corrosion inhibitor, leveling agent It may further include known additives such as surface lubricants, dyes, pigments, antifoams, fillers, light stabilizers.

The adhesive composition of the present invention can be cured to form an adhesive. In addition, transparent substrate film; An adhesive film may be formed by including the adhesive formed on one surface of the transparent base film.

The pressure-sensitive adhesive may have a thickness of 25 to 1000 mu m.

The transparent base film is not particularly limited as it is excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like.

The curing is used in the art, but is not particularly limited, photocuring using ultraviolet light is generally.

In the polymerization using ultraviolet rays, the light source has a light emission distribution having a wavelength of 400 nm or less, preferably 150 to 400 nm, and more preferably 200 to 380 nm. , Black light lamps, microwave-excited mercury lamps and metal halide lamps.

The intensity of the light irradiation can be appropriately adjusted according to the required physical properties of the pressure-sensitive adhesive, the amount of accumulated light useful for the activity of the free radical photoinitiator is preferably 10 to 5000mJ / ㎠, more preferably 200 to 800mJ / ㎠. It is preferable to have an appropriate curing reaction time within the above range, and do not cause a decrease in cohesion, yellowing or deterioration of the support of the cured product produced by heat radiated from the lamp and exotherm during the polymerization reaction.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Preparation example: Urethane (meth) acrylate oligomer

A 10 L four-necked flask equipped with a thermometer and a stirring device and capable of refluxing nitrogen was immersed in an oil bath, and 3038 g of polypropylene glycol (Sannix PP-4000, Samyang Chemical) with a molecular weight of 4,000 was placed in this flask. 337 g and 0.3 g of dibutyl tin dilaurate as urethane-forming catalysts were added, followed by stirring at a reaction temperature of 60 ° C. for 2 hours to obtain a urethane prepolymer. After the reaction temperature was lowered to 40 ° C., 0.3 g of dibutyltin dilaurate, a urethaneization catalyst, and 0.5 g of 2,6-t-butyl-4-methylphenol (BHT), a polymerization inhibitor, were added thereto. A mixture of 56 g of butanol and 88 g of 2-hydroxyethyl acrylate (Osaka Organic Chemical Co., Ltd.) was reacted with a slow dropwise addition for 30 minutes. The reaction temperature was then raised to 70 ° C. and stirred to obtain a monofunctional urethane acrylate oligomer having a weight average molecular weight of 26,600.

Example 1

(1) pressure-sensitive adhesive composition

69.95% by weight of urethane (meth) acrylate oligomer of Preparation Example 1, 10% by weight of isobornyl acrylate and 10% by weight of hydroxyethyl acrylate with (meth) acrylate monomer, and EX-214 product by ADEKA (ADEKA Co., Ltd.) A pressure-sensitive adhesive composition was prepared by mixing 10% by weight and 0.05% by weight of 1-benzyloctahydropyrrole [1,2-a] pyrimidine as a photolatent amidine base generator.

(2) adhesive film

Apply the pressure-sensitive adhesive composition of (1) to a thickness of 300 μm after curing on a single transparent film coated with a silicone terephthalate (PET) film on a polyethylene terephthalate (PET) film and UV light (600mJ / ㎠) at a speed of 4m / min. Was investigated and fully cured. Thereafter, the same transparent film was bonded onto the cured pressure sensitive adhesive layer to prepare an adhesive film.

Examples 2-6 and Comparative Examples 1-4

To carry out the same as in Example 1, to prepare a pressure-sensitive adhesive film using the composition of Table 1.

division urethane
Acrylate oligomer (Meth)
Acrylate monomer Epoxy monomer Photolatent base generators Initiator A-1 A-2 A-3 B-1 B-2 C-1 C-2 Radical Cation Example 1 69.95 - - 10 10 10 0.05 - - - Example 2 69 - - 10 10 10 One - - - Example 3 59 - - 10 10 10 11 - - - Example 4 67 - - 10 10 10 - 3 - - Example 5 - 69 - 10 10 10 One - - - Example 6 - - 69 10 10 10 One - - - Comparative Example 1 69 - - 10 10 10 - - One - Comparative Example 2 69 - - 10 10 10 - - - One Comparative Example 3 69 - - 10 10 10 - - 0.5 0.5 A-1: Urethane (meth) acrylate oligomer of a manufacture example (monofunctional)
A-2: Atresin, UN-9000PEP (Polycarbonate Backbone, Mw 5,000, Monofunctional)
A-3: Negami Chemical Co., Ltd., KY-101 (polyester backbone, Mw 3,000, bifunctional)
B-1: Isobonylacrylate
B-2: hydroxyethyl acrylate
Epoxy Monomer: ADEKA, EX-214
C-1: BASF, 1-benzyloctahydropyrrolo [1,2-a] pyrimidine (amidine base generator)
C-2: BASF, Irgacure 369 (amine base generator)
Radical initiator: BASF, Darocur 1173
Cationic initiator: ADEKA company, SP500 product

Test Example

Physical properties of the pressure-sensitive adhesive composition and pressure-sensitive adhesive film prepared in Examples and Comparative Examples were measured by the following method, and the results are shown in Table 2 below.

1. Storage stability

The viscosity immediately after the pressure-sensitive adhesive composition was completed and the viscosity increase rate after standing at 23 ° C. for 12 hours were measured using a Brook field viscometer. The viscosity increase rate was calculated by the following Equation 1, and evaluated based on the following criteria.

<Evaluation Criteria>

○: viscosity change rate 5% or less

△: viscosity change rate 10% or less

X: viscosity change rate exceeded 10%

2. Hardness

After peeling the transparent film of the prepared pressure-sensitive adhesive film was rub test by hand, and evaluated based on the following criteria.

<Evaluation Criteria>

(Circle): The adhesive surface is clean, without getting on a hand.

(Triangle | delta): It does not adhere to a hand but marks remain on the adhesive surface

×: stained on the hand, the form of the adhesive cannot be maintained

3. Curing shrink

The pressure-sensitive adhesive composition prepared on the release-coated PET film was coated to have a thickness of 300 μm after curing, and then cured by irradiation with ultraviolet (600 mJ / cm 2) at a speed of 4 m / min. The surface of the cured adhesive layer was reflected-reflected using the external light source, and evaluated based on the following criteria.

<Evaluation Criteria>

○: Shrinkage did not occur in both the pressure-sensitive adhesive layer and the PET film.

(Triangle | delta): Shrinkage generate | occur | produces to one or more of an adhesive layer or a PET film.

X: Shrinkage arises in both an adhesive layer and PET film.

4. Adhesive force (N / 25㎜)

The prepared pressure-sensitive adhesive film was cut into a size of 25 mm × 250 mm using a super cutter, and then the release film was peeled off, bonded to a glass plate, and a specimen was prepared. The prepared specimen was fixed to a universal testing machine (UTM), and then peeled at 180 ° at a speed of 300 m / min to measure adhesion to glass. At this time, the adhesive force means the adhesive force of the surface irradiated with ultraviolet rays.

5. Adhesion durability (heat and moisture resistance)

The prepared pressure-sensitive adhesive film was cut to A4 size using a super cutter, and one transparent film was peeled off, and then bonded to a glass plate. The conjugate was treated in an autoclave for 20 minutes at 50 ° C. and 5 atmospheres to prepare a specimen. Heat-resistant durability was left for 100 hours in the specimen at 80 ℃ oven, heat-resistant durability was left for 100 hours in 60 ℃ and 90% RH oven, and then whether bubbles or peeling occurred on the bonding surface of the glass plate and the adhesive layer It was observed visually and evaluated based on the following criteria.

<Evaluation Criteria>

(Circle): There is no bubble and peeling phenomenon in a joining surface.

(Triangle | delta): Some bubble or peeling phenomenon exists in a joining surface.

X: There exist many bubbles and peeling phenomenon in a joining surface.

division Storage stability Curing degree
(Rubbing test) Hardening shrinkage adhesiveness
(N / 25mm) durability Heat resistance Wet heat Example 1 ○ ○ ○ 14 △ △ Example 2 ○ ○ ○ 17.8 ○ ○ Example 3 ○ ○ ○ 14.5 △ ○ Example 4 ○ ○ ○ 12 ○ ○ Example 5 ○ ○ ○ 13 ○ ○ Example 6 ○ ○ ○ 7 ○ ○ Comparative Example 1 ○ × - Not measurable - - Comparative Example 2 △ × - Not measurable - - Comparative Example 3 △ △ ○ 13.2 × ×

As shown in Table 2, the compositions of Examples 1 to 6 containing the urethane acrylate oligomer, (meth) acrylate monomer, epoxy monomer, and the photolatent amidine or amine base generator according to the present invention have a storage stability. It was confirmed that the hardness and excellent hardness through the rub test. In addition, hardening shrinkage and anti-glare adhesion were well expressed, and it was confirmed that durability was excellent under heat and moisture resistant conditions.

On the other hand, in Comparative Examples 1 and 2 was not carried out curing was not able to measure the physical properties. In addition, in Comparative Example 3, a radical initiator and a cationic initiator were used in place of the photolatent amidine or amine base generator, and the curability was good, but it was confirmed that durability was difficult due to the low anti-adhesive strength under heat and moisture resistant conditions. .

Claims (10)

Adhesive composition for photopolymerization containing a urethane acrylate oligomer, a (meth) acrylate monomer, an epoxy monomer, and a photolatent amidine or an amine base generator.
The pressure-sensitive adhesive composition for photopolymerization according to claim 1, wherein the photolatent amidine base generator is a benzylalkyl compound including at least one compound selected from the group consisting of tetramethyl guanidine, diazabicyclononene, and diazabicycloundecene.
The pressure-sensitive adhesive composition for photopolymerization according to claim 1, wherein the photo-latent amine base generator is an α-amino ketone compound containing a tertiary amine.
The pressure-sensitive adhesive composition for photopolymerization according to claim 1, wherein the urethane acrylate oligomer has a weight average molecular weight of 1,000 to 35,000.
The pressure-sensitive adhesive composition for photopolymerization according to claim 1, wherein the acrylate monomer is 1 to 6 functional.
The pressure-sensitive adhesive composition for photopolymerization according to claim 1, wherein the epoxy monomer is a glycidyl epoxy monomer.
The method according to claim 1, wherein the urethane acrylate oligomer is 10 to 80% by weight, 5 to 40% by weight of (meth) acrylate monomer, 5 to 40% by weight epoxy monomer and 0.1 to latent photo amidine or amine base generator Adhesive composition for photopolymerization containing 10 weight%.
The adhesive for photopolymerization which the adhesive composition of any one of Claims 1-7 hardened | cured.
A transparent base film;
The pressure-sensitive adhesive film according to claim 8, which is formed on one surface of the transparent base film.
The adhesive film according to claim 9, wherein the pressure-sensitive adhesive has a thickness of 25 to 1000 탆.