KR20150040073A - Adhesive composition - Google Patents

Abstract

The present invention relates to an adhesive composition, and more specifically, to an adhesive composition which has excellent anti-static property when using a small amount about 1/5 by containing an acrylic copolymer and a nucleophilic compound having LiI and a double bond, and can improve degradation of durability caused by bleed out due to use of the small amount.

Description

[0001] ADHESIVE COMPOSITION [0002]

The present invention relates to a pressure-sensitive adhesive composition excellent in antistatic property and durability.

2. Description of the Related Art Generally, a liquid crystal display device (LCD) is provided with a liquid crystal cell containing a liquid crystal and a polarizer, and a suitable adhesive layer is used to bond the liquid crystal cell. As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive based on an acrylic copolymer having excellent tackiness and transparency is often used.

When the releasing film is peeled off from the pressure-sensitive adhesive layer in the process of attaching the polarizing plate to the liquid crystal cell, static electricity is generated, and the generated static electricity affects the orientation of the liquid crystal to cause defects or to be introduced between the liquid crystal cell and the pressure- It causes pollution by foreign matter.

In order to solve this problem, an ionic antistatic agent is mixed in a pressure-sensitive adhesive composition. However, bleed-out phenomenon precipitated by surface migration of the ionic antistatic agent may cause lifting, bubbling and peeling. In particular, such problems can be exacerbated by exposure to high temperature and high temperature and high humidity environments.

Accordingly, a pressure-sensitive adhesive composition has been proposed in which an ionic antistatic agent such as a fluorine-containing organic salt or an ionic liquid is used to increase the compatibility with a pressure-sensitive adhesive (Korean Patent Publication No. 2002-0016163 and Japanese Patent Laid-Open No. 2005-290357 ).

In addition, the bleed-out phenomenon can be improved by using an ionic antistatic agent exhibiting excellent antistatic property even when a small amount is used. LiI is known as a compound that can satisfy this requirement. However, since LiI reacts with oxygen in the pressure-sensitive adhesive to form iodine to exhibit color, the use thereof in the field of optical pressure-sensitive adhesives is limited.

An object of the present invention is to provide a pressure-sensitive adhesive composition in which LiI is applied as an ionic antistatic agent to provide an antistatic property even in a small amount, and a bleed-out phenomenon is suppressed, thereby improving durability.

In order to achieve the above object, the present invention provides a pressure-sensitive adhesive composition containing an acrylic copolymer, LiI and a nucleophilic compound having a double bond.

The nucleophilic compound having a double bond may be an allyl group-containing compound or an aromatic compound.

The nucleophilic compound having a double bond may have a molecular weight of 200 or more.

The nucleophilic compound having a double bond may have a boiling point of 200 ° C or higher.

Preferably, the nucleophilic compound having a double bond may be at least one selected from the group consisting of the following formulas (1) to (6).

The nucleophilic compound having a double bond may contain from 0.5 mol to 5 mol based on 1 mol of LiI.

The LiI may be contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the acrylic copolymer.

The nucleophilic compound having a double bond may be contained in an amount of 0.2 to 5 parts by weight based on 100 parts by weight of the acrylic copolymer.

The pressure-sensitive adhesive composition may further contain a crosslinking agent.

The present invention also relates to an acrylic copolymer containing a (meth) acrylate monomer having an alkyl group of 1-12 carbon atoms, an ether having an allyl group (meth) acrylate or allyl group, and a crosslinkable monomer; And LiI. ≪ / RTI >

The pressure-sensitive adhesive composition of the present invention has an advantage that antistatic properties equal to or higher than those of the prior art can be exhibited even though a small amount of an antistatic agent is used at a ratio of about 1/5.

Further, since the pressure-sensitive adhesive composition of the present invention uses a small amount of an antistatic agent, there is an advantage that the durability deterioration due to the bleed-out phenomenon can be improved.

The present invention relates to a pressure-sensitive adhesive composition excellent in antistatic property and durability.

Hereinafter, the present invention will be described in detail.

The pressure-sensitive adhesive composition of the present invention contains an acrylic copolymer, LiI and a nucleophilic compound having a double bond.

The present invention uses LiI as an ionic antistatic agent to significantly reduce the amount of the ionic antistatic agent used compared to the prior art, thereby suppressing the bleed-out phenomenon in which the antistatic agent component migrates to the surface and precipitates, thereby improving durability .

Further, by using a certain amount of the above-mentioned nucleophilic compound having a double bond with LiI, it is possible to inhibit the color expression by the iodine molecule (I ₂ ) generated by the reaction with oxygen. The generated iodine molecule (I ₂ ) reacts with the iodine anion (I ^- ) to form an iodine trimer, whereby the color becomes strong. Therefore, by adding a compound containing a double bond in the molecule as a scavenger of I ₂ produced, the expression of hue can be suppressed by removing I ₂ .

The acrylic copolymer of the present invention preferably contains a (meth) acrylate monomer having an alkyl group of 1-12 carbon atoms and a crosslinkable monomer. In the present invention, (meth) acrylate means acrylate and methacrylate, and the content is based on the solid content.

The acrylic copolymer of the present invention preferably contains a (meth) acrylate monomer having an alkyl group of 1-12 carbon atoms, (meth) acrylate having an allyl group, and a crosslinkable monomer. In this case, it is preferable that the pressure-sensitive adhesive composition further contains no nucleophilic compound having a double bond.

The ether having a (meth) acrylate or an allyl group having an allyl group may specifically be one or more selected from the group consisting of allyl methacrylate, allyl acrylate and styryl allyl ether.

Examples of the (meth) acrylate monomer having an alkyl group of 1-12 carbon atoms include (meth) acrylates derived from an aliphatic alcohol having 1 to 12 carbon atoms such as methyl acrylate, ethyl acrylate, propyl acrylate, n- Butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (Meth) acrylate, decyl (meth) acrylate, and lauryl (meth) acrylate. These may be used alone or in combination of two or more. Of these, n-butyl acrylate, 2-ethylhexyl acrylate or a mixture thereof is preferable.

The crosslinkable monomer has a function of imparting cohesive strength or cohesive strength by chemical bonding with the following crosslinking agent, and examples thereof include monomers having a hydroxyl group, monomers having a carboxyl group, monomers having an amide group, and monomers having a tertiary amine group have. These may be used alone or in combination of two or more.

Examples of the monomer having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl Hydroxypropyleneglycol (meth) acrylate, hydroxyalkylene glycol having 2 to 4 carbon atoms in the alkylene group (e.g., methoxyethyl (meth) acrylate, Hydroxybutyl vinyl ether, 8-hydroxyoctyl vinyl ether, 9-hydroxynonyl (meth) acrylate, 4-hydroxybutyl vinyl ether, Vinyl ether, and 10-hydroxydecyl vinyl ether. Of these, 4-hydroxybutyl vinyl ether is preferable.

Examples of the monomer having a carboxyl group include monovalent acids such as (meth) acrylic acid and crotonic acid; Dicarboxylic acids such as maleic acid, itaconic acid, and fumaric acid, and monoalkyl esters thereof; 3- (meth) acryloylpropionic acid; A succinic anhydride ring-opening addition adduct of 2-hydroxyalkyl (meth) acrylate in which the alkyl group has 2 to 4 carbon atoms, anhydrous succinic ring opening adduct of a hydroxyalkylene glycol (meth) acrylate having 2 to 4 carbon atoms in the alkylene group , Compounds obtained by ring-opening addition of succinic anhydride to caprolactone adducts of 2-hydroxyalkyl (meth) acrylates whose alkyl groups have 2-3 carbon atoms, and among these, (meth) acrylic acid is preferable.

Examples of the monomer having an amide group include (meth) acrylamide, N-isopropyl acrylamide, N-tertiary butyl acrylamide, 3-hydroxypropyl (meth) acrylamide, 4-hydroxybutyl (Meth) acrylamide, 8-hydroxyoctyl (meth) acrylamide and 2-hydroxyethylhexyl (meth) acrylamide. Of these, (meth) acrylamide is preferable.

Examples of the monomer having a tertiary amine group include N, N- (dimethylamino) ethyl (meth) acrylate, N, N- (diethylamino) ethyl (meth) ) Acrylate, and the like.

The crosslinkable monomer is preferably contained in an amount of 0.05 to 10 parts by weight, more preferably 0.1 to 8 parts by weight, based on 100 parts by weight of the (meth) acrylate monomer having an alkyl group having 1-12 carbon atoms. When the content is less than 0.05 part by weight, the cohesive force of the pressure-sensitive adhesive becomes small and durability may be deteriorated. When the content is more than 10 parts by weight, a high gel fraction may lower the adhesive strength and cause durability problems.

In addition, other crosslinking monomers other than the above-mentioned monomers may be further added in an amount not lowering the adhesive force, for example, 40 parts by weight or less based on 100 parts by weight of the total monomers used for producing the acrylic copolymer.

The method for producing the copolymer is not particularly limited and can be produced by methods such as bulk polymerization, solution polymerization, emulsion polymerization or suspension polymerization, which are commonly used in the art, and solution polymerization is preferable. In addition, a solvent, a polymerization initiator, a chain transfer agent for molecular weight control and the like which are usually used in polymerization can be used.

The present invention is characterized in that LiI, which is an ionic antistatic agent, and a nucleophilic compound having a double bond are mixed.

The nucleophilic compound having a double bond may be an allyl group-containing compound or an aromatic compound.

The nucleophilic compound having a double bond may have a molecular weight of 200 or more. If the molecular weight is less than 200, the compound containing a double bond may be volatilized and removed in the course of drying and removing the solvent of the pressure-sensitive adhesive.

In addition, the nucleophilic compound having a double bond may have a boiling point of 200 ° C or higher. If the boiling point is lower than 200 ° C, it may be volatilized during drying due to the same reason as described above.

Preferably, the nucleophilic compound having a double bond may be at least one selected from the group consisting of the following formulas (1) to (6). In view of the heat resistance and the like, the formula (1) or (2) is preferable.

[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

The nucleophilic compound having a double bond is preferably contained in an amount of 0.5 to 5 mol per 1 mol of LiI. If the content is less than 0.5 mol, the iodine removal performance may be insufficient to cause color development. If the content exceeds 5 mol, the bleed-out phenomenon of the compound containing the double bond added And durability due to deterioration of adhesion can be deteriorated.

It is preferable that the LiI is contained in an amount of 0.1 to 3 parts by weight, preferably 0.3 to 1 part by weight based on 100 parts by weight of the acrylic copolymer. If the content is less than 0.1 parts by weight, antistatic properties may be insufficient. If the content is more than 3 parts by weight, durability may deteriorate or color may be developed.

The content of LiI is about 1/5 of the conventional amount of the ionic antistatic agent, and even if a small amount of LiI is used in this manner, the antistatic property equivalent to that of the conventional one can be exhibited.

The nucleophilic compound having a double bond is preferably contained in an amount of 0.2 to 5 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the acrylic copolymer. If the content is less than 0.5 parts by weight, the performance of suppressing color development may be insufficient. If the content is more than 5 parts by weight, durability may be deteriorated.

When the (meth) acrylate having an allyl group or the ether having an allyl group is contained in the acrylic copolymer, the amount of the (meth) acrylate monomer containing 1 to 10 parts by weight relative to 100 parts by weight of the (meth) acrylate monomer having the alkyl group having 1-12 carbon atoms . When the content is less than 1 part by weight, it is difficult to suppress hue. When the content is more than 10 parts by weight, gelation may occur during production of an acrylic copolymer.

The pressure-sensitive adhesive composition of the present invention may further contain a crosslinking agent.

The crosslinking agent can improve the adhesion and durability, and can maintain the reliability at a high temperature and the shape of the pressure-sensitive adhesive.

The cross-linking agent may be an isocyanate-based, epoxy-based, melamine-based, peroxide-based, metal chelating-based, oxazoline-based, or the like. Preferred is a double isocyanate-based or epoxy-based.

Examples of the isocyanate-based isocyanate include isocyanate-based compounds such as tolylene diisocyanate, xylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethyl xylene diisocyanate, Diisocyanate compounds such as isocyanate; An adduct obtained by reacting 3 moles of a diisocyanate compound with 1 mole of a polyhydric alcohol compound such as trimethylolpropane, an isocyanurate compound in which 3 moles of a diisocyanate compound is self-condensed, a diisocyanate obtained from 2 moles of 3 moles of a diisocyanate compound And multifunctional isocyanate compounds containing three functional groups such as burette, triphenylmethane triisocyanate and methylene bistriisocyanate in which the remaining one mole of diisocyanate is condensed in urea.

The epoxy system may be an ethylene glycol diglycidyl ether, a diethylene glycol diglycidyl ether, a polyethylene glycol diglycidyl ether, a propylene glycol diglycidyl ether, a tripropylene glycol diglycidyl ether, a polypropylene glycol di Hexanediol diglycidyl ether, polytetramethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, diethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, Glycerol polyglycidyl ether, polyglycerol polyglycidyl ether, resorcinol diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, trimethylol propane triglycidyl ether, pentaerythritol poly Glycidyl ether, sorbitol polyglycidyl ether, adipic acid diglycidyl ester, phthalic acid diglycidyl ester, tris (glycidyl) isocyanurate N, N, N ', N'-tetraglycidyl-m-hexyldicyclohexyl) isocyanurate, 1,3-bis (N, N-glycidylaminomethyl) cyclohexane, Xylylenediamine, and the like.

Examples of the melamine type include hexamethylol melamine, hexamethoxymethyl melamine, and hexabutoxymethyl melamine.

Such a crosslinking agent may be contained in an amount of 0.1 to 15 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the acrylic copolymer. If the content is less than 0.1 part by weight, the cohesive strength may be decreased due to insufficient crosslinking, which may deteriorate the durability of the adhesive durability and the cutability. If the content is more than 15 parts by weight, the residual stress due to the excessive crosslinking reaction may be deteriorated.

In addition to the above components, the pressure-sensitive adhesive composition may further contain various additives such as a silane coupling agent, a tackifier resin, an antioxidant, a leveling agent, a surface lubricant, a dye, an antioxidant, and the like in order to control the adhesion, cohesion, viscosity, A pigment, a defoaming agent, a filler, a light stabilizer, and the like.

Such an additive can appropriately control the content within a range that does not impair the effect of the present invention.

The pressure-sensitive adhesive composition of the present invention can be used particularly as a pressure-sensitive adhesive for a polarizing plate or a pressure-sensitive adhesive for a surface protective film for bonding with a liquid crystal cell. It can be used not only as a protective film, a reflective sheet, a structural adhesive sheet, a photographic adhesive sheet, a lane marking adhesive sheet, an optical adhesive product, an electronic component adhesive, but also a general commercial adhesive sheet product.

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.

Manufacturing example  1: Acrylic copolymer

90 parts by weight of n-butyl acrylate (BA), 7 parts by weight of methyl acrylate (MA), 2 parts by weight of 2-hydroxyethyl acrylate (manufactured by Nippon Aerosil Co., Ltd.) were added to a 1 L reactor equipped with a cooling device, HEA) and 1 part by weight of acrylic acid (AA), and then 100 parts by weight of acetone was added as a solvent. Nitrogen gas was then purged for 1 hour to remove oxygen and then maintained at 62 ° C. After the mixture was homogenized, 0.07 part by weight of azobisisobutyronitrile (AIBN) was added as a reaction initiator and reacted for 6 hours to prepare an acrylic copolymer having a weight average molecular weight of about 1,000,000.

Manufacturing example  2-1: Acrylic copolymer

88 parts by weight of n-butyl acrylate (BA), 7 parts by weight of methyl acrylate (MA), 2 parts by weight of 2-hydroxyethyl acrylate (HEA), 2 parts by weight of acrylic acid (AA) 1 part by weight and allyl methacrylate 2 parts by weight was used to prepare an acrylic copolymer having a weight average molecular weight of about 1,200,000.

Manufacturing example  2-2 to Manufacturing example  2-5

The acrylic copolymer was prepared in the same manner as in Preparation Example 2-1, but using the monomer mixture shown in Table 1 below.

division
(Parts by weight) BA MA HEA AA Having a double bond
Nucleophilic compound Production Example 2-1 88 7 2 One Allyl methacrylate, 2 Production example 2-2 88 7 2 One Allyl acrylate, 2 Production Example 2-3 88 7 2 One Styryl allyl ether, 2 Production example 2-4 85 7 2 One Allyl methacrylate, 5 Production example 2-5 80 7 2 One Allyl methacrylate, 10

Example  1-17 and Comparative Example  1-4

As shown in Table 2 below, the acrylic copolymer, the crosslinking agent, the ionic antistatic agent and the silane coupling agent of the above preparation examples were mixed and then diluted with an organic solvent to prepare a pressure-sensitive adhesive composition.

division
(Parts by weight) Manufacturing example
Cross-linking agent Daejeon
Inhibitor Nucleophilic compound having a double bond Silane
Coupling agent A-1 A-2 A-3 A-4 C-1 C-2 C-3 C-4 C-5 C-6 Example 1 1,100 One - - - LiI, 0.5 2 - - - - - 0.5 Example 2 1,100 One - - - LiI, 0.5 - 2 - - - - 0.5 Example 3 1,100 One - - - LiI, 0.5 - - 2 - - - 0.5 Example 4 1,100 One - - - LiI, 0.5 - - - 2 - - 0.5 Example 5 1,100 One - - - LiI, 0.2 One - - - - - 0.5 Example 6 1,100 One - - - LiI, 1 4 - - - - - 0.5 Example 7 1,100 - One - - LiI, 0.5 2 - - - - - 0.5 Example 8 1,100 - - One - LiI, 0.5 2 - - - - - 0.5 Example 9 1,100 - - - One LiI, 0.5 2 - - - - - 0.5 Example 10 1,100 One - - - LiI, 0.5 - - - - 2 - 0.5 Example 11 1,100 One - - - LiI, 0.5 - - - - - 2 0.5 Example 12 1,100 One - - - LiI, 4 10 0.5 Example 13 2-1,100 One - - - LiI, 0.5 - - - - - - 0.5 Example 14 2-2,100 One - - - LiI, 0.5 - - - - - - 0.5 Example 15 2-3,100 One - - - LiI, 0.5 - - - - - - 0.5 Example 16 2-4,100 One - - - LiI, 0.5 - - - - - - 0.5 Example 17 2-5,100 One - - - LiI, 0.5 - - - - - - 0.5 Comparative Example 1 1,100 One - - - LiI, 0.5 - - - - 0.5 Comparative Example 2 1,100 One - - - B-1,0.5 - - - - 0.5 Comparative Example 3 1,100 One - - - B-2,0.5 - - - - 0.5 Comparative Example 4 1,100 One - - - B-3,0.5 - - - - 0.5

B-2:

B-3: NaPF₆
C-1:

C-2:

C-3:

C-4:

C-5:

C-6:

A-1: Coronate-L (TDI crosslinking agent, CORONATE-L, Japan Urethane Industry)
A-2: Isocyanate art of TDI (Urethane Japan)
A-3: Coronate-HXR (isocyanurate of HDI, Urethane Company of Japan)
A-4: Takenate-110N (XDI crosslinking agent, TAKENATE-110N Mitsui Chemicals
B-1:

B-2:

B-3: NaPF ₆
C-1:

C-2:

C-3:

C-4:

C-5:

C-6:

The pressure-sensitive adhesive composition prepared above was applied on a release film coated with silicone release agent to a thickness of 25 탆 and dried at 100 캜 for 1 minute to form an adhesive layer.

The pressure-sensitive adhesive layer prepared above was laminated to an iodine-based polarizing plate having a thickness of 185 μm by pressure-sensitive adhesive processing to produce a polarizer with a pressure-sensitive adhesive. The prepared polarizing plate was stored for a curing period under the conditions of 23 캜 and 60% RH.

Test Example

The properties of the pressure-sensitive adhesive composition and the polarizer with a pressure-sensitive adhesive prepared in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 3 below.

1. Surface resistivity (Ω / □)

The prepared polarizer plate with a pressure-sensitive adhesive was measured 10 times at three points of the pressure-sensitive adhesive layer using a surface resistance meter (MCP-HT450, Mitsubishi Chemical Co., Ltd.) and expressed as an average value thereof.

Thereafter, the polarizing plate with a pressure-sensitive adhesive was allowed to stand at 60 DEG C for 24 hours and then measured in the same manner as above.

2. Adhesive durability

The release film of the polarizing plate with a pressure-sensitive adhesive was peeled off, and the surface of the pressure-sensitive adhesive layer was bonded with Corning glass. After leaving for 300 hours at 80 캜 (heat resistance) / 60 캜 and 90RH% (humidity and humidity resistance), appearance was confirmed.

<Evaluation Criteria>

Bubbles and peeling phenomenon are clearly recognized: ×

Bubbles and peeling phenomenon were observed: △

Bubble or peeling phenomenon is slightly observed, but polarizer performance is maintained: ○

Bubbles and peeling phenomenon are observed: ◎

3. Discoloration

The viscoelastic durability of the sample evaluated for discoloration was visually confirmed.

<Evaluation Criteria>

The discoloration was visually confirmed: ×

Discoloration is not confirmed with naked eyes: ○

division Surface resistivity
(Ω / □) Heat resistance Humidity Durability Discoloration Example 1 3X10 ¹⁰ ◎ ◎ ○ Example 2 3X10 ¹⁰ ◎ ◎ ○ Example 3 3X10 ¹⁰ ○ ◎ ○ Example 4 5X10 ¹⁰ ◎ ◎ ○ Example 5 7X10 ¹⁰ ◎ ◎ ○ Example 6 9X10 ⁹ ◎ ◎ ○ Example 7 3X10 ¹⁰ ◎ ◎ ○ Example 8 2X10 ¹⁰ ○ ◎ ○ Example 9 3X10 ¹⁰ ◎ ◎ ○ Example 10 3X10 ¹⁰ ○ ◎ ○ Example 11 3X10 ¹⁰ ◎ ◎ ○ Example 12 3X10 ¹⁰ ◎ ◎ ○ Example 13 3X10 ⁸ ○ ○ ○ Example 14 3X10 ¹⁰ ◎ ◎ ○ Example 15 4X10 ¹⁰ ◎ ◎ ○ Example 16 3X10 ¹⁰ ◎ ◎ ○ Example 17 3X10 ¹⁰ ◎ ◎ ○ Comparative Example 1 3X10 ¹⁰ ◎ ◎ × Comparative Example 2 8X10 ¹¹ △ ◎ ○ Comparative Example 3 4X10 ¹¹ ○ ◎ ○ Comparative Example 4 6X10 ¹¹ × × ○

As shown in Table 3, the pressure-sensitive adhesive compositions of Examples 1 to 17 containing a nucleophilic compound having LiI and a double bond according to the present invention exhibited heat resistance equal to or higher than those of Comparative Examples 1 to 4, It was confirmed that the surface resistivity was excellent.

Claims (10)

Acrylic copolymer, LiI and a nucleophilic compound having a double bond.
The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond is a compound having an allyl group or an aromatic compound.
The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond has a molecular weight of 200 or more.
The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond has a boiling point of 200 ° C or higher.
The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond is at least one selected from the group consisting of the following formulas (1) to (6):
[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond is contained in an amount of 0.5 to 5 mol per 1 mol of LiI.
The pressure-sensitive adhesive composition according to claim 1, wherein the LiI is contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the acrylic copolymer.
The pressure-sensitive adhesive composition according to claim 1, wherein the nucleophilic compound having a double bond is contained in an amount of 0.2 to 5 parts by weight based on 100 parts by weight of the acrylic copolymer.
The pressure-sensitive adhesive composition according to claim 1, wherein the pressure-sensitive adhesive composition further comprises a crosslinking agent.
(Meth) acrylate monomer having an alkyl group having from 1 to 12 carbon atoms, (meth) acrylate having an allyl group, and an acrylic copolymer containing a crosslinkable monomer; And LiI.