KR20150044778A - Adhesive composition for polarizing plate, adhesive film comprising the same, polarizing plate comprising the same and optical display apparatus comprising the same - Google Patents

Abstract

In the present invention, disclosed are an adhesive composition for a polarizing plate including an initiator and a compound of chemical formula 1, an adhesive film for polarizing plates including the same, a polarizing plate including the same and an optical display device including the same.

Description

TECHNICAL FIELD The present invention relates to an adhesive composition for a polarizing plate, an adhesive film for a polarizing plate comprising the same, a polarizing plate including the same, and an optical display device including the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to an adhesive composition for a polarizing plate, an adhesive film for a polarizing plate containing the same, a polarizing plate including the same, and an optical display device including the same.

The polarizing plate may be formed by laminating a triacetyl cellulose (TAC) film on both sides of a polyvinyl alcohol (PVA) polarizer with an aqueous adhesive, or a protective film or an optical compensation film on one side of a polyester resin, a polycarbonate resin, It is common to produce a TAC film on one side with a polyolefin-based resin or a cycloolefin-based resin by using an aqueous adhesive. The TAC film has high moisture permeability and can be adhered to the PVA polarizer using water-based adhesive while drying the water. However, in the case of a polyester resin, a polycarbonate resin, an acrylic resin, an amorphous polyolefin resin or a cycloolefin resin, since the resin is hydrophobic or has a lower moisture permeability than TAC, residual moisture is likely to remain in the PVA- If the water remains, problems such as insufficient bonding strength and poor appearance may occur. For the above reasons, it is possible to use a cationic polymerizable ultraviolet curable adhesive instead of an aqueous adhesive or use a thermosetting adhesive as an adhesive for bonding a PVA polarizer and a protective film having a low moisture permeability. (Japanese Unexamined Patent Application Publication No. 2008-233874, 1997-022007).

However, when an ultraviolet curable adhesive is used in the production of a polarizing plate, an ultraviolet ray blocking agent is used together with the protective film for protection of the polarizing plate. As a result, sufficient ultraviolet ray irradiation is not performed and adhesive strength is lowered. For this, there is a problem of workability such that irradiation is required only in the direction of the protective film in which the ultraviolet screening agent is not used. In addition, the cationic polymerizable ultraviolet curing type adhesive is liable to be influenced by humidity at the time of curing and is liable to cause deviation in curing state, so that the moisture content of the PVA-based polarizer as well as the environmental humidity are strictly controlled Needs to be.

On the other hand, the thermosetting adhesive is excellent in that such a problem is relatively small. When a thermosetting adhesive is used, there is no restriction on whether the protective film is ultraviolet-shielded, and it is much easier to manage the environmental humidity or the moisture content of the PVA-based polarizer.

An object of the present invention is to provide an adhesive composition for a polarizing plate having high adhesiveness, cohesiveness and durability.

Another object of the present invention is to provide an adhesive composition for a polarizing plate capable of preventing lifting and peeling between a polarizer and a protective film under high temperature and high humidity conditions.

It is still another object of the present invention to provide an adhesive film formed of the adhesive composition for a polarizing plate.

It is still another object of the present invention to provide an optical display device including the polarizing plate.

The adhesive composition for a polarizing plate of the present invention may include a compound of the following formula (1) and an initiator:

≪ Formula 1 >

(Wherein R ₁ , R ₂ , R ₃ , R a, R b, X ₁ , X ₂ , X ₃ , m are as defined in the following description).

The adhesive film for a polarizing plate of the present invention may be formed of the adhesive composition for a polarizing plate.

The polarizer of the present invention comprises a polarizer; An optical film formed on one side or both sides of the polarizer; And an adhesive layer formed between the polarizer and the optical film, and the adhesive layer may be formed of the adhesive composition for a polarizing plate.

The optical display device of the present invention may include the polarizing plate.

The present invention provides an adhesive composition for a polarizing plate having high adhesiveness, cohesiveness and durability. The present invention provides an adhesive composition for a polarizing plate capable of preventing lifting and peeling between a polarizer and a protective film under high temperature and high humidity conditions.

1 is a sectional view of a polarizing plate of one embodiment of the present invention.
2 is a cross-sectional view of an optical display device according to an embodiment of the present invention.

As used herein, the term " compound " may include monomers, oligomers, resins, and the like.

The adhesive composition for a polarizing plate of the present invention may be used to adhere an optical film to one or both sides of a polarizer, and the optical film may include at least one of a protective film and an optical compensation film. In an embodiment, the optical film may be, but is not limited to, TAC (triacetylcellulose), PET (polyethylene terephthalate), PC (polycarbonate), COP (cyclic olefin polymer)

Hereinafter, the adhesive composition for a polarizing plate of one embodiment of the present invention will be described.

The adhesive composition for a polarizing plate of one embodiment of the present invention may comprise a compound of the following formula 1:

≪ Formula 1 >

(Wherein R ₁ is hydrogen or an alkyl group having 1 to 3 carbon atoms,

R ₂ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 20 carbon atoms,

R ₃ is hydrogen, an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,

Ra is an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,

Rb is a single bond, an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,

X ₁ , X ₂ and X ₃ are each independently a hydroxyl group, an alkyl group having 1-10 carbon atoms, an aryl group having 6-20 carbon atoms, an alkoxy group having 1-5 carbon atoms, or an aryloxy group having 6-20 carbon atoms, X ₁ , X ₂ , and X ₃ is a hydroxyl group or an alkoxy group having 1-5 carbon atoms,

m is 0 or 1).

In an embodiment, R ₂ may be an alkylene group having 1 to 10 carbon atoms or an arylene group having 6 to 20 carbon atoms, for example, an alkylene group having 1 to 5 carbon atoms, R ₃ is an alkyl group having 1 to 10 carbon atoms, An aryl group of 1 to 20 carbon atoms, for example, an alkyl group of 1 to 5 carbon atoms, Ra may be an alkylene group of 1 to 10 carbon atoms or an arylene group of 6 to 20 carbon atoms, , Rb is, for example, an arylene group of 6 to 20 carbon atoms in the alkylene group or a single bond, a carbon number of 1-10 and may be an alkylene group of a single bond or a carbon number of 1-5, X _1, X _2, X ₃ is C 1 -5 < / RTI > alkoxy group.

The compound of the formula (1) is contained in the adhesive composition for a polarizing plate, so that the adhesiveness and cohesiveness of the adhesive composition for a polarizing plate can be enhanced and there is no lifting and / or peeling between the polarizer and the optical film at high temperature and / or high humidity. The compound of the formula (1) is a thermosetting compound which is contained in an adhesive composition for a polarizing plate, so that there is no restriction on whether the optical film is shielded from ultraviolet rays, and the humidity and the moisture content of the PVA polarizer can be controlled much more easily.

The compound of the formula (1) may have a weight average molecular weight of 400 to 800 g / mol, and the adhesive composition for a polarizing plate in the above range may have a low viscosity and a wettability effect. The compound of formula (1) may have a viscosity of 50 to 150 cPs at 25 占 폚, and within this range, an adhesive layer for a polarizing plate having a uniform thickness can be formed.

The compound of formula (I) may be contained in an amount of 1-50 wt%, for example, 10-50 wt% or 5-30 wt% of the adhesive composition for a polarizing plate based on a solid content, There is an effect that the post-cohesion property is increased.

The compound of formula (1) may be a commercially available product or may be prepared from a silane group-containing amine compound and a radical-curing compound. Specifically, the amine group of the silane group-containing amine compound and the acetoacetoxy group of the radical- ≪ / RTI >

In an embodiment, the silane group-containing amine compound may include a monofunctional amine compound containing a silane group and an amine group, or a polyfunctional amine compound containing a silane group and two or more amine groups. In one embodiment, the silane group amine compound may be represented by the following formula:

(2)

(Ra, Rb, X ₁ , X ₂ , X ₃ , and m are as defined above).

Specifically, the silane group amine compound may include at least one of 3-ureidopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, and a compound of the following formula (2a), and these may be used alone or in combination of two or more.

≪ EMI ID =

In embodiments, the radical curable compound may include a radical curable compound having a functional group of the following formula (e.g., acetoacetoxy group):

(3)

(Wherein * is a linking group and R ₃ is as defined above)

For example, the radical curable compound may be represented by the following formula (4): < EMI ID =

≪ Formula 4 >

(Wherein R ₁ , R ₂ and R ₃ are as defined above).

For example, the radical-curable compound may be at least one of acetoacetoxyethyl (meth) acrylate, acetoacetoxymethyl (meth) acrylate, acetoacetoxypropyl (meth) acrylate, and acetoacetoxybutyl These may be used alone or in combination of two or more.

The reaction of the silane group-containing amine compound and the radical curing compound can be carried out by a conventional method. For example, the silane group-containing amine compound and the radical curing compound may be mixed at a weight ratio of 1:20 to 1: 1 and reacted at room temperature. The initiator may include a photo-curing initiator, a thermal curing initiator, or a mixture thereof. The initiator may be included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the radical-curable compound, So that the decrease in transparency can be prevented.

The adhesive composition for a polarizing plate may further include an initiator.

By curing the compound of the formula (1), the initiator can increase the cohesiveness and adhesion of the adhesive composition for a polarizing plate. The initiator may include a photo-curing initiator, a thermal curing initiator, or a mixture thereof. Accordingly, the adhesive composition for a polarizing plate may be a photocurable or thermosetting adhesive composition.

The photocuring initiator may include phosphorus, triazine, acetophenone, benzophenone, thioxanthone, benzoin, oxime, or a mixture thereof. The thermoset initiator may include a peroxide clock compound, an azo-based compound, a ketal-based compound, a hemi-ketal-based compound, or a mixture thereof. Preferably, the initiator may be a thermal curing initiator. Since the adhesive composition contains a thermosetting initiator, there is no restriction of the ultraviolet shielding by the protective film which may be a problem when using the photo-curing initiator, and the humidity and the water content of the polarizer can be easily managed.

The initiator may be included in an amount of 0.1 to 6 parts by weight based on 100 parts by weight of the compound of formula (1). Within this range, the polymerization of the (meth) acrylate compound can be sufficiently carried out and the remaining amount of the initiator can be prevented from remaining. Preferably 0.1-3 parts by weight.

The initiator may be contained in an amount of from 0.1 to 2% by weight, preferably from 1 to 2% by weight, based on the solid content of the composition. Within the above range, there may be a reliability stabilizing effect after thermosetting.

The adhesive composition for a polarizing plate may contain a conductivity-imparting additive such as an antioxidant, an ultraviolet absorber, an ion-type conductive agent, and a conductive metal oxide fine particle, a light diffusivity-imparting additive, a viscosity modifier, and the like within a range that does not impair the effect of the present invention have.

The adhesive composition for a polarizing plate is blended with the components described above, and the viscosity at 25 ° C may be less than 150 cPs. Within the above range, the coating property of the adhesive composition may be good. Preferably, the viscosity may be 1-135 cPs, more preferably 40-100 cPs.

The adhesive composition for a polarizing plate may contain a solvent to facilitate application, but it is possible to solve problems such as bubbling by using a solventless type solvent-free adhesive composition.

In embodiments, the adhesive composition for a polarizing plate is by reacting a silane-group-containing amine compound, a radical-curable compound to prepare a compound of formula 1, in situ (in situ). < / RTI > At this time, the composition may further include at least one of a silane group-containing amine compound and a radical-curing compound, as well as the compound of the formula (1) and the initiator, and the silane group- The curing compound can realize durability improvement effect under high temperature / high humidity reliability condition. For example, the silane group-containing amine compound in the composition may be contained in an amount of 5-50% by weight, and the radical curing compound in an amount of 30-95% by weight, for example, 50-95% by weight.

For example, the composition may include 5-30 wt% of the compound of Formula 1, 5-10 wt% of the silane group-containing amine compound, 50-85 wt% of the radical curing compound, and 0.1-1 wt% of the initiator based on the solid content. Within this range, there may be an effect of increasing the wettability. In addition, the composition comprises 5-50% by weight of the compound of formula 1, 30-94% by weight of the radical curing compound, for example, 30-50% by weight, for example 49-94% by weight and 0.1-1% can do. In the above range, reliability can be improved.

The adhesive film for a polarizing plate of the present invention may be formed of an adhesive composition for a polarizing plate, and an adhesive film for a polarizing plate may be used for bonding the polarizing film and the protective film.

The thickness of the polarizing plate adhesive film may be 0.1 占 퐉 to 5 占 퐉, preferably 0.1-1 占 퐉. In the above range, it can be used as an adhesive film for a polarizing plate.

The adhesive film for a polarizing plate can be produced by curing an adhesive composition for a polarizing plate. In one embodiment, the curing can be carried out at 80 占 폚 or higher, preferably 80-150 占 폚. In other embodiments, curing may be carried out under the conditions of ^{10-2000mW / cm 2, 10-2000J / cm} 2.

The polarizing plate of the present invention may include an adhesive layer formed of the adhesive composition for a polarizing plate.

1 is a cross-sectional view of a polarizer of an embodiment of the present invention. 1, the polarizing plate 100 includes a polarizer 10, a first protective film 20 formed on the upper side of the polarizer 10, and a second protective film 30 formed on the lower side of the polarizer 10 A first adhesive layer 40 is formed between the first protective film 20 and the polarizer 10 and a second adhesive layer 50 is formed between the second protective film 30 and the polarizer 10 And at least one of the first adhesive layer 40 and the second adhesive layer 50 may be formed of the adhesive composition for a polarizing plate of the embodiment of the present invention.

The polarizer can be produced from a film made of a polyvinyl alcohol-based resin. As the polyvinyl alcohol-based resin, polyvinyl alcohol, polyvinyl formal, polyvinyl acetal, or a saponified product of an ethylene-vinyl acetate copolymer can be used. The degree of saponification of the film made of the polyvinyl alcohol-based resin may be 99 mol% or more, preferably 99-99.5 mol%, the degree of polymerization may be 2000 or more, preferably 2000-2500, and the thickness may be 10 탆 to 200 탆.

The polarizer can be produced by dying iodine to a film made of a polyvinyl alcohol-based resin and stretching it. The stretching ratio may be 2.0-6.0. After stretching, the color correction step may be performed by immersing the boric acid solution and the aqueous potassium iodide solution.

The thickness of the polarizer may be 10 占 퐉 to 200 占 퐉, and may be used for the polarizer in the above range.

The protective film is laminated on one surface or both surfaces of the polarizer, and is not particularly limited as long as it is a transparent film suitable for the use of the polarizing plate. As a concrete example, there can be mentioned cellulose-based materials including triacetylcellulose (TAC), polyester-based materials including polyethylene terephthalate (PET), cyclic polyolefin (COP) -based materials, polycarbonate (PC) A material selected from the group consisting of an ether sulfone type, a polysulfone type, a polyamide type, a polyimide type, a polyolefin type, a polyarylate type, a polyvinyl alcohol type, a polyvinyl chloride type, a polyvinylidene chloride type, Lt; / RTI >

The protective film may have a thickness of 25 占 퐉 to 500 占 퐉. In the above range, it can be used as a polarizing plate when laminated on a polarizing element. And preferably 25 占 퐉 to 100 占 퐉.

The protective film may be subjected to a surface treatment, for example, a corona pre-treatment step of 250 mJ / cm ² or more before the application of the adhesive composition or before the preparation of the polarizing plate.

The adhesive layer may be formed of the adhesive composition for the polarizing plate. The thickness of the adhesive layer may be 0.1 占 퐉 to 5 占 퐉.

The polarizing plate can be produced by a conventional method. For example, an adhesive composition for a polarizing plate is applied to one side of a protective film to produce a protective film having an adhesive composition layer. Drying and the like can be carried out if necessary. As the coating method, for example, a die coating method, a roll coating method, a gravure coating method and a spin coating method can be used. A protective film having the above-mentioned adhesive composition layer is laminated on each of the upper and lower surfaces of the polarizer to obtain a laminate. The adhesive composition layer is cured to form an adhesive layer, from which a polarizing plate is produced. The curing of the adhesive composition may be carried out by the method described above.

The optical display device of the present invention may include the polarizer adhesive composition, the adhesive layer formed of the adhesive composition, or a polarizer including the same. The optical display device may be a conventional optical display device including a polarizing plate, for example, a liquid crystal display, an organic light emitting diode display, or the like.

2 is a cross-sectional view of a liquid crystal display according to an embodiment of the present invention.

2, the liquid crystal display of one embodiment of the present invention includes a liquid crystal display panel 200; And a polarizing plate 100 formed on the upper portion of the liquid crystal display panel 200. The polarizing plate 100 may include an adhesive film formed of an adhesive composition according to one embodiment of the present invention. Although not shown in FIG. 2, a polarizing plate may be further included in the lower portion of the liquid crystal display panel, and the polarizing plate may include an adhesive film formed of the adhesive composition.

In the present specification, 'upper' and 'lower' are defined with reference to drawings, and 'upper' may be changed to 'lower' and 'lower' may be changed to 'upper' according to viewing time.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Specific specifications of the components used in the following examples and comparative examples are as follows.

A. Amine compound containing silane group: N- (2-aminoethyl) -3-aminopropyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd., trade name: KBM-603)

B. Radical curable compound: 2-acetoacetoxyethyl acrylate (Eastman, trade name: AAEM)

C. Initiator: benzoyl peroxide (Yuzawa, Japan)

D. Immune compound: polyethyleneimine (trade name: SP-012)

E. Compound not containing (meth) acrylate: 1,1-dimethylethyl-3-oxobutanoate (Eastman, trade name: TBAA)

Example  One

(A) and (B) were blended in the contents described in Table 1 (unit: parts by weight) without solvent to confirm that the compound of formula (1a) was prepared by NMR and 2 parts by weight of the initiator (C) To prepare an adhesive composition for a polarizing plate.

<Formula 1a>

Example  2 to 4

An adhesive composition for a polarizing plate was prepared in the same manner as in Example 1, except that the contents of (A) and (B) in Example 1 were changed as shown in Table 1 below.

Comparative Example  1 to 4

An adhesive composition for a polarizing plate was prepared in the same manner as in Example 1, except that the contents of (A), (B), (D) and (E) were changed as shown in Table 1 in Example 1.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 A 50 5 20 30 100 - 20 - B 50 95 80 70 - 100 - - D - - - - - - - 20 E - - - - - - 80 80

Production of Polarizer

A polyvinyl alcohol film (degree of saponification: 99.5, degree of polymerization: 2000) having a thickness of 80 mu m was used as a film for polarizer production. The polyvinyl alcohol film was immersed in an aqueous 0.3% iodine solution, and then stretched to give a stretch ratio of 5.0. Subsequently, the stretched polyvinyl alcohol film was immersed in a boric acid solution of 3% concentration and an aqueous solution of 2% potassium iodide to perform color correction, followed by drying at 50 DEG C for 4 minutes to prepare a polarizer.

As the first transparent protective film, 80 mu m thick triacetate cellulose (TAC) was used and subjected to corona treatment at 250 mJ / cm &lt; 2 &gt; or more.

As a transparent second protective film, a cycloolefin resin having a thickness of 30 탆 was subjected to a corona treatment using a resin which was polymerized with cyclic olefin as a polymerization unit, and which was generically referred to as COP, at a rate of 250 mJ / cm 2 or more.

The first protective film-adhesive composition-polarizer-adhesive composition-second protective film under the environment of a temperature of 22 to 25 ° C and a humidity of 20 to 60%, and dried in an oven at 80 ° C for 5 minutes to prepare a polarizing plate.

The following properties of the adhesive composition or polarizing plate for a polarizing plate of Examples and Comparative Examples were evaluated and shown in Table 2.

(1) Number of heat shock cracks: The polarizing plate prepared in Examples and Comparative Examples was laminated to glass after preparing a polarizing film with a size of 100 mm x 100 mm (width x length) in order to examine the crack level under thermal shock condition. -40 ° C to 85 ° C 100 cycles After the thermal shock test, the samples were checked for the occurrence of polarizer cracks in the reflection mode under the fluorescent lamp and in the MD direction in the back light mode, and the number thereof was measured. The total number of test polarizers was 5.

(2) Adhesiveness: In order to confirm the adhesiveness of the polarizing plate adhesive film, a cutter cutter was inserted between the protective film at the end of the polarizing plate and the polarizer. The edge of the protective film did not enter the gap between the protective film and the polarizer, the edge of the edge of the edge was slightly inclined, the edge of the edge of the edge was slightly inclined, The results are shown in the table.

(3) Hot water immersion test (durability): A sample is prepared so that the polarizing plate prepared above has a width X length of 5 cm X 5 cm. And immersed in constant temperature water (60 DEG C) for 2 hours, respectively. The highest values of the decolorization of the polarizer and the contraction length of the one end of the polarizer were measured. The shrinkage length means the minimum value of the distance from the end of the protective film to the end of the polarizer adjacent to the polarizer after the hot water immersion test. The protective film does not shrink in the water resistance test, but the polarizer shrinks when immersed in hot water. A polarizer was peeled off and not discolored.?, A polarizer was peeled off from 1 mm or less to 1 mm or less.?, A polarizer was peeled from 1 mm or more to 2 mm or less and peeled off?

(4) Viscosity of adhesive composition: The viscosity of the adhesive composition at 25 캜 was measured using a Viscometer (Model: DV-II + Pro, manufactured by Broolfield).

Number of heat shock cracks in polarizer Adhesiveness Hot water immersion test Viscosity
(25 C, cPs) TAC cotton COP cotton Example 1 7 ◎ ○ ○ 138 Example 2 2 ◎ ◎ ◎ 47 Example 3 0 ○ ◎ ◎ 74 Example 4 0 ◎ ○ ◎ 91 Comparative Example 1 19 X X X 14 Comparative Example 2 Over 50 X X X 163 Comparative Example 3 One △ △ X 57 Comparative Example 4 Poor quality Poor quality Poor quality Poor quality 4300

As shown in Table 2, the adhesive composition for a polarizing plate of the present invention has good adhesiveness and is excellent in durability because the polarizer and protective film are not peeled off or discolored even in hot water immersion, and the number of cracks is remarkably low even in thermal shock.

On the other hand, Comparative Example 1 containing the silane group-containing amine compound without the compound of the formula (1) had a high occurrence frequency of cracking, and was not durable and adhesive. In addition, in Comparative Example 2, which does not include the compound of Formula 1 and contains a radical-curing compound, there is a problem that adhesion with the substrate is not achieved. Also, in Comparative Example 3, which contains a compound similar in structure to the radical curable compound of the present invention but does not contain a (meth) acrylate group, adhesion and durability became a problem. Further, in Comparative Example 4 including an imine compound which is a component of the conventional water-based adhesive, no gap was formed between the polarizer and the protective film.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

An adhesive composition for a polarizing plate comprising a compound of the following formula (1) and an initiator:
&Lt; Formula 1 >

(Wherein R ₁ is hydrogen or an alkyl group having 1 to 3 carbon atoms,
R ₂ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 20 carbon atoms,
R ₃ is hydrogen, an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,
Ra is an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,
Rb is a single bond, an aliphatic hydrocarbon group having 1-10 carbon atoms or an aromatic hydrocarbon group having 6-20 carbon atoms,
X ₁ , X ₂ and X ₃ each independently represent a hydroxyl group, an alkyl group having 1-10 carbon atoms, an aryl group having 6-20 carbon atoms, an alkoxy group having 1-5 carbon atoms, or an aryloxy group having 6-20 carbon atoms,
At least one of X ₁ , X ₂ and X ₃ is a hydroxyl group or an alkoxy group having from 1 to 5 carbon atoms,
m is 0 or 1). The adhesive composition for a polarizing plate according to claim 1, wherein the compound of Formula 1 is contained in an amount of 10-50 wt% of the composition. The adhesive composition for a polarizing plate according to claim 1, wherein the compound of Formula 1 has a weight average molecular weight of 400-800 g / mol. The adhesive composition for a polarizing plate according to claim 1, wherein the compound of Formula 1 has a viscosity of 50-150 cPs at 25 ° C. The adhesive composition for a polarizing plate according to claim 1, wherein the compound of formula (1) is prepared from a silane group-containing amine compound and a radical-curing compound. 6. The adhesive composition for a polarizing plate according to claim 5, wherein the silane group-containing amine compound is represented by the following formula (2)
(2)

(Ra, Rb, X ₁ , X ₂ , X ₃ , and m are as defined above). 6. The adhesive composition for a polarizing plate according to claim 5, wherein the radical-curable compound is represented by the following formula (4)
&Lt; Formula 4 >

(Wherein R ₁ , R ₂ and R ₃ are as defined above). The method of claim 5, wherein the composition is in-situ (in the silane-group-containing amine compound and the radically curable compound situ reaction product. The adhesive composition for a polarizing plate according to claim 8, wherein the silane group-containing amine compound is contained in an amount of 5-50% by weight. The adhesive composition for a polarizing plate according to claim 8, wherein the radical curing compound is contained in an amount of 50 to 95% by weight. The adhesive composition for a polarizing plate according to claim 1, wherein the initiator is a thermosetting initiator. The adhesive composition for a polarizing plate according to claim 1, wherein the composition is a thermosetting composition. An adhesive film for a polarizing plate formed from the adhesive composition for a polarizing plate according to any one of claims 1 to 12. A polarizer; An optical film formed on one side or both sides of the polarizer; And an adhesive layer formed between the polarizer and the optical film,
Wherein the adhesive layer is formed of the adhesive composition for a polarizing plate according to any one of claims 1 to 12. A display device comprising the polarizer of claim 14.

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