TW201446912A - Adhesive composition - Google Patents

Abstract

Disclosed is an adhesive composition, wherein the adhesive composition includes an acrylic copolymer containing an ionic monomer of Chemical Formula 1 below, and an ionic anti-static agent, and thus is free from lifting, bubbling, delaminating, and the like due to the migration of the anti-static agent to the surface, thereby exhibiting excellent durability and anti-static property, and can effectively suppress the corrosion of a metal layer without containing a separate corrosion inhibitor: wherein in Chemical Formula 1, R1 is hydrogen or a methyl group; Y is O or -NH; R2 is an aliphatic hydrocarbon group having at least 3 carbon atoms with or without a hetero atom; R4, R5, and R6 are each independently an aliphatic hydrocarbon group having 1-12 carbon atoms or an aromatic hydrocarbon group having 6-12 carbon atoms; and adjacent substituents of R4 to R6 may bind to each other to form a cycloaliphatic or aromatic ring.

Description

Adhesive composition

The invention relates to an adhesive composition, which is improved by improving the primary antibody The compatibility of the electric agent with an acrylic acid copolymer containing no acid to suppress bleeding, the adhesive composition can simultaneously improve durability, antistatic property and corrosion resistance.

Generally, a liquid crystal display is provided with a liquid crystal cell including a liquid crystal and a polarizing plate, and an adhesive layer suitable for bonding the liquid crystal cell and the polarizing plate is used. For the adhesive, an acrylate adhesive containing an acrylic polymer having excellent adhesion and transparency as a substrate is often used.

In the process in which the polarizing plate is bonded to the liquid crystal cell, peeling of a release film from the adhesive layer causes static electricity. This static electricity affects the alignment of the liquid crystal, causes the liquid crystal to fail, or induces electrostatic attraction, resulting in contamination of the liquid crystal generated by the foreign matter suspended between the liquid crystal cell and the adhesive.

An ionic antistatic agent is mixed with an adhesive composition to solve these problems. However, an osmotic appearance is caused by migration of the ionic antistatic agent to the surface, which may cause problems such as elevation, bubbling, delamination, and the like. In particular, these defects are at high or high temperatures. Under high humidity, it may be worse.

Further, liquid crystal cells containing an ITO metal layer or the like may be corroded by H2O and O2 in the adhesive, resulting in formation of metal oxides, hydroxides, and other corrosive products. These may deteriorate the electrical or mechanical stability of the liquid crystal display or cause problems of visibility and reliability.

In order to improve metal corrosion, it is preferred to eliminate the necessity to improve the durability of the adhesive composition, and to use hydrogen ions to generate a monomer (for example, a monomer having a carboxyl group).

As described above, there is no hydrogen ion generating monomer, and the demand for an adhesive composition having excellent antistatic properties and durability is increasing.

In this respect, the prior art discloses an acrylic polymer obtained by introducing an amine group or a polyethylene glycol group without hydrogen ion generating monomers to improve compatibility with an antistatic agent (Korea) Patent Publication Nos. 2009-132564 and 2011-136760).

However, the above method has a very poor effect in reducing the deterioration of durability due to the appearance of bleeding.

Accordingly, the present invention has been made to solve the above problems in the prior art, and an object of the present invention is to provide an adhesive composition which is free from the migration of an antistatic agent to a surface due to elevation, bubbling, delamination, and the like. The resulting problems, thus exhibiting excellent durability and antistatic properties, can effectively inhibit the corrosion of the metal layer without the need to include a separate corrosion inhibitor.

In order to achieve the object, there is provided an adhesive composition comprising an acrylic copolymer comprising an ionic monomer and an ionic antistatic agent of the following Chemical Formula 1:

Wherein in Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; R ₂ is an aliphatic hydrocarbon group having at least 3 carbon atoms, with or without a hetero atom; R ₄ , R ₅ And R _{6 are} each independently an aliphatic hydrocarbon group having 1 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms; and adjacent substituents of R ₄ to R ₆ may be bonded to each other To form an alicyclic or aromatic ring.

Here, in the ionic monomer of the above Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; R ₂ is an alkyl group having 3 to 20 carbon atoms, with or without O, N, or S; R ₄ , R ₅ , and R _{6 are} each independently an alkyl group having 1 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms; and R 4 to R 6 Adjacent substituents are preferably bonded to each other to form a cycloaliphatic or aromatic ring.

Here, an anion of the ionic monomer of the chemical formula 1 may be selected from the group consisting of a fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodide ion.

The ionic monomer of the chemical formula 1 may be at least one selected from the group consisting of Chemical Formulas 2 to 7 below: [Chemical Formula 2]

The acrylic copolymer may comprise a (meth) acrylate monomer having an alkyl group having 4 to 12 carbon atoms and the ionic monomer of the chemical formula 1.

The ionic monomer of the Chemical Formula 1 may be contained in an amount of from 0.5 to 30 parts by weight per 100 parts by weight of the (meth) acrylate monomer having an alkyl group having 4 to 12 carbon atoms.

The ionic antistatic agent may be an ionic salt consisting of: a cation selected from the group consisting of an alkali metal salt, a monoammonium salt, a sulfonium salt, and a phosphorus salt; and an anion selected from the group A group consisting of a fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodide ion.

The ionic antistatic agent may be contained in an amount of from 0.1 to 15 parts by weight per 100 parts by weight of the acrylic copolymer.

The adhesive composition may further comprise a crosslinking agent.

The present invention is directed to an adhesive composition for inhibiting the exudation of an antistatic agent by improving the compatibility of an antistatic agent with an acid copolymer containing no acid, which can simultaneously improve durability and antistatic properties. Sex and corrosion resistance.

Hereinafter, the present invention will be described in detail.

The adhesive composition of the present invention comprises an acrylic copolymer comprising an ionic monomer of the following Chemical Formula 1 and an ionic antistatic agent.

Wherein in Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; R ₂ is an aliphatic hydrocarbon group having at least 3 carbon atoms, with or without a hetero atom; R4, R5, and R6 each independently is an aliphatic hydrocarbon group having 1 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms; and adjacent substituents of R4 to R6 may be bonded to each other to form a fat Ring or aromatic ring.

In the adhesive composition of the present invention, the compatibility of the ionic antistatic agent is improved by the ionic monomer which is immobilized during the polymerization of the acrylic copolymer.

By suppressing the appearance of bleeding, the improvement in compatibility leads to an increase in durability in which the antistatic agent component migrates and precipitates on the surface. This phenomenon is suppressed even in an environment of high temperature or high temperature and humidity, thereby maintaining excellent durability.

Further, since the ionic monomer and the ionic antistatic agent together have antistatic properties, the adhesive composition of the present invention has remarkably enhanced antistatic effect as compared with the conventional adhesive composition using only one antistatic agent.

Further, in the ionic monomer of the present invention, the chain between the acrylic group and the amino group is long, so that the ionic functional group is sufficiently long to be bonded from the main chain of the acrylic copolymer. This indicates that the ionic functional group may be located on the surface of the main monomer of the acrylic copolymer, that is, butyl acrylate, and therefore, the ionic functional group is improved between the acrylic copolymer and the antistatic agent and between the acrylic copolymer and the adherend. The beneficial effects of the interaction.

The ionic monomer contained in the acrylic copolymer includes a propylene The acid group is capable of copolymerizing with an acrylic monomer and has the above Chemical Formula 1 to form an ionic bond with the ionic antistatic agent.

In the ionic monomer of the above Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; R ₂ is an alkyl group having 3 to 12 carbon atoms, with or without O, N, or S; R ₄ , R ₅ , and R _{6 are} each independently an alkyl group having 1 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms; and a phase of R ₄ to R ₆ The ortho substituents may be bonded to each other to form an alicyclic or aromatic ring.

More preferably, R ₁ is hydrogen or monomethyl; R ₂ is an alkyl group having from 3 to 6 carbon atoms, with or without O; R ₄ , R ₅ , and R _{6 are} each independently An alkyl group having 1 to 3 carbon atoms, or a phenyl group; and adjacent substituents of R ₄ to R ₆ may be bonded to each other to form a pyridine or imidazole derivative.

Further, the anion of the above ionic monomer of the formula 1 is not particularly limited as long as it is generally used in the art, but may be selected from the group consisting of a fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodide ion. Among them, considering antistatic properties and durability, it is preferably PF6- or TFSI-.

Preferably, the ionic monomer of the above Chemical Formula 1 is at least one selected from the group consisting of Chemical Formulas 2 to 7 below:

The acrylic copolymer of the present invention preferably contains an alkyl (meth) acrylate monomer having from 4 to 12 carbon atoms and the ionic monomer of the above Chemical Formula 1. Herein, the term (meth) acrylate means acrylate and methacrylate, and the content thereof is based on the solid content.

Examples of the mono(meth)acrylate monomer having an alkyl group of 4 to 12 carbon atoms may include n-butyl (meth) acrylate, 2-butyl (meth) acrylate, t-butyl ( Methyl) acrylate, 2-ethylhexyl (meth) acrylate, ethyl (meth) acrylate, m-ethyl (meth) acrylate, n-propyl (meth) acrylate, different Propyl (meth) acrylate, pentyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (methyl) propyl Oleate, mercapto (meth) acrylate, mercapto (meth) acrylate, dodecyl (meth) acrylate, and the like. Among them, n-butyl acrylate, 2-ethylhexyl acrylate, and mixtures thereof may be preferred. These may be used singly or in combination of two or more.

The ionic monomer of the above Chemical Formula 1 is contained in an amount of from 0.5 to 30 parts by weight, more preferably from 1 to 10 parts by weight per 100 parts by weight of the (meth) acrylate monomer having an alkyl group having from 4 to 12 carbon atoms. Less than 0.5 part by weight per 100 parts by weight of the (meth) acrylate monomer may result in insufficient improvement in heat resistance, and more than 30 parts by weight per 100 parts by weight of the (meth) acrylate monomer May cause deterioration of heat and humidity resistance.

In addition to the ionic monomer having a vinyl group, the acrylic copolymer of the present invention further includes a polymerizable monomer having a crosslinkable functional group. The polymerizable monomer has a crosslinkable functional group which enhances the cohesive strength or the adhesive strength of the adhesive composition by chemical bonding, thereby imparting durability and cuttability to the adhesive composition, and the use does not occur. The component of hydrogen ion (H ⁺ ).

Specific examples of the polymerizable monomer having a crosslinkable functional group may include a monomer having a hydroxyl group, a monomer having an amide group, a monomer having a third amine group, and the like. These may be used singly or in combination of two or more.

Specific examples of the monomer having a monohydroxy group may include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxyl Butyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate, 2-hydroxypropanediol (meth) acrylate, alkylene hydroxyalkyl glycol (meth) acrylate having 2 to 4 carbon atoms, 4-hydroxybutyl vinyl ether, 5-hydroxy pentyl Vinyl ether, 6-hydroxyhexyl vinyl ether, 7-hydroxyheptyl vinyl ether, 8-hydroxyoctyl vinyl ether, 9-hydroxydecyl vinyl ether, 10-hydroxydecyl vinyl ether, and the like. Among them, 4-hydroxybutyl vinyl ether is preferred.

Specific examples of the monomer having a monoamide group may include (meth)acrylamide, N-isopropyl ester acrylamide, N-third butyl acrylamide, 3-hydroxypropyl (meth) acrylamide, 4- Hydroxybutyl (meth) acrylamide, 6-hydroxyhexyl (meth) acrylamide, 8-hydroxyoctyl (meth) acrylamide, 2-hydroxyethylhexyl (meth) acrylamide, and the like. Among them, (meth)acrylamide is preferred.

Specific examples of the monomer having a third amino group may include N,N-(dimethylamino)ethyl (meth) acrylate, N,N-(diethylamino)ethyl (meth) acrylate, N,N-(dimethylamino)propyl (meth) acrylate, and the like.

The polymerizable monomer having a crosslinkable functional group is preferably contained in an amount of 0.05 to 10 parts by weight per 100 parts by weight of the (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms, more preferably 0.1 to 8 parts by weight. Less than 0.05 part by weight per 100 parts by weight of the (meth) acrylate monomer may reduce the cohesive force of the adhesive, resulting in deterioration of durability. More than 10 parts by weight per 100 parts of the (meth) acrylate monomer may lower the adhesive strength adhesive due to a high gel fraction, and there is a problem of durability.

Further, in addition to the above monomers, the acrylic copolymer of the present invention may further contain other polymerizable monomers in a content within a range in which the strength of the adhesive is not lowered, for example, 10 parts by weight or less based on the total weight.

The preparation method of the copolymer is not particularly limited. The copolymer can be produced by, for example, bulk polymerization, solution polymerization, emulsion polymerization, suspension polymerization, or the like, which is commonly used in the prior art. Among them, solution polymerization is preferred. Further, a solvent, a polymerization initiator, a chain transfer agent for controlling the molecular weight, and the like are usually used for a substance such as polymerization, and may be used.

The acrylic copolymer has a weight average molecular weight (in terms of polystyrene, Mw), preferably from 50,000 to 2,000,000, more preferably from 400,000 to 2,000,000, as measured by gel permeation chromatography (GPC). If the weight average molecular weight is less than 50,000, the cohesive force between the copolymers is insufficient, causing a problem of durability of the adhesive. If the weight average molecular weight is higher than 200,000, a large amount of a dilution solvent may be required to ensure processability at the time of coating.

The ionic antistatic agent is an ionic salt containing an anion and a cation which can impart ionic conductivity to the adhesive. The type of the ionic antistatic agent is not particularly limited.

Specifically, the ionic antistatic agent may be a cation comprising a group selected from the group consisting of a free alkali metal salt, an ammonium salt, a phosphonium salt, and a phosphorus salt; and a free fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodine An ionic salt of an anion of the group of ions.

The ionic antistatic agent can be included in the weight of the acrylic copolymer It is preferably 0.1 to 15 parts by weight, preferably 0.5 to 10 parts by weight per 100 parts by weight. Less than 0.1 part by weight of the ionic antistatic agent may result in insufficient antistatic properties, and more than 10 parts by weight of the antistatic agent may fail to ensure durability.

The adhesive composition of the present invention may further comprise a crosslinking agent.

Crosslinkers improve adhesion and durability, and maintain reliability at high temperatures in the shape of the adhesive.

Examples of the crosslinking agent may include an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, a peroxide crosslinking agent, a metal chelate crosslinking agent, and an oxazoline crosslinking. Agents, etc. Among them, one type or two types or a mixture of two or more types may be used. Among them, an isocyanate crosslinking agent or an epoxy crosslinking agent is preferred.

Examples of isocyanates may include diisocyanate compounds such as toluene diisocyanate, xylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, cyclohexane diisocyanate, and isophora. Mercapone diisocyanate, tetramethyl xylene diisocyanate, and naphthalene diisocyanate; an adduct obtained by reacting a 3 mol of a diisocyanate compound with a 1 mol of a polyhydric alcohol compound, the polyol The compound is, for example, trimethylolpropane or the like, an isocyanurate compound obtained by self-condensation of a 3 mole of a diisocyanate compound, a biuret compound, by 2 moles in 3 moles. The diisocyanate urea obtained from the diisocyanate compound is obtained by condensation with the remaining 1 molar diisocyanate compound, and a polyfunctional isocyanate compound having a trifunctional group such as triphenylmethane triisocyanate and methylene II Isocyanate, etc.

Examples of the epoxy resin may include ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, polypropylene glycol condensed water. Glycerol ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, glycerol polydiether , polyglycerol polyglycidyl ether, resorcinol diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol polyglycidyl ether , sorbitol polyglycidyl ether, diglycidyl adipate, diglycidyl phthalate, tris(glycidyl)isocyanurate, tris(glycidoxyethyl)isocyanurate An acid ester, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetraglycidyl-m-xylenediamine or the like.

Examples of the melamine may include hexamethylol melamine, hexamethoxymethyl melamine, hexabutoxymethyl melamine, and the like.

The crosslinking agent may be contained in an amount of from 0.1 to 15 parts by weight per 100 parts by weight of the acrylic copolymer, preferably from 0.1 to 5 parts by weight. If the content of the crosslinking agent is less than 0.1 part by weight, the cohesive strength is lowered due to insufficient crosslinking degree, resulting in deterioration of physical properties such as durability and machinability. On the other hand, if the content of the crosslinking agent is more than 15 parts by weight, there is a possibility of causing a problem in terms of reduced residual stress due to an excessive crosslinking reaction.

The adhesive composition can be further packaged in addition to the above ingredients Including additives such as decane coupling agents, tackifier resins, antioxidants, leveling agents, surface lubricants, dyes, pigments, defoamers, fillers, and light stabilizers to adjust the strength, cohesion, viscosity, Modulus of elasticity, glass transition temperature, and the like.

The content of these additives can be appropriately controlled within a range not impairing the effects of the present invention.

The adhesive composition of the present invention can be used as an adhesive for bonding a polarizing plate to a liquid crystal cell or as a surface protective film. Further, the adhesive composition of the present invention can be used for a protective film, a reflective sheet, an adhesive sheet for forming, an adhesive sheet for photography, an adhesive sheet for a landmark, an optical adhesive product, and Electronic products are also used as adhesive sheet products for general use in commercial products.

In the following, although the preferred embodiments are provided to aid the understanding of the invention, the examples provided below are merely illustrative of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the invention and the scope of the invention.

Preparation Example: Preparation of Acrylic Copolymer

Preparation Example 1:

85 parts by weight of n-butyl acrylate, 8 parts by weight of methacrylate, 2 parts by weight of 2-hydroxyethyl acrylate, and 5 parts by weight as an ionic monomer The monomer mixture was fed into a one liter reactor equipped with a cooling device for promoting reflux and temperature control of nitrogen, and 100 parts by weight of acetone, which was written as a solvent, was fed into the reactor. Thereafter, nitrogen gas was purged for 1 hour to remove oxygen, and then maintained at a temperature of 62 °C. The mixture was stirred evenly. Next, 0.07 part by weight of azobisisobutyronitrile as a reaction initiator was fed into the reactor, followed by a reaction for 6 hours to prepare an acrylic copolymer having a weight average molecular weight of about 1,000,000.

Preparation Example 2:

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 3:

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 4:

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 5:

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 6:

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 7:

In addition to 80 parts by weight of n-butyl acrylate, 8 parts by weight of methacrylate, 2 parts by weight of 2-hydroxyethyl acrylate, and 10 parts by weight as an ionic monomer An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Preparation Example 8:

In addition to 55 parts by weight of n-butyl acrylate, 8 parts by weight of methacrylate, 2 parts by weight of 2-hydroxyethyl acrylate, and 35 parts by weight as an ionic monomer An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Comparative Example 1

An acrylic acid copolymer was prepared in the same manner as in Preparation Example 1, except that 90 parts by weight of n-butyl acrylate, 8 parts by weight of methacrylate, and 2 parts by weight of 2-hydroxyethyl acrylate were used.

Comparative Example 2

apart from Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Comparative Example 3

apart from: Use instead An acrylic copolymer was prepared in the same manner as in Preparation Example 1.

Examples 1 to 15 and Comparative Examples 1 to 3

The adhesive composition having a solid content of 15% was prepared by mixing the acrylic copolymer of Preparation Example 1, a crosslinking agent, an ionic antistatic agent, and a decane coupling agent, as shown in Table 1 below. The mixture was then diluted with ethyl acetate.

Each of the adhesive compositions prepared as described above was applied to a release film coated with a release agent, having a thickness of 25 μm , followed by drying at 100 ° C for 1 minute to form an adhesive layer.

The adhesive thus formed was adhered to a 185 μm- thick iodine-based polarizing plate by adhesion treatment, thereby producing an adhesive-adhered polarizing plate. The manufactured polarizing plate was stored at 23 ° C and a relative humidity of 60%.

Test case

The characteristics of the polarizing plate adhered to the adhesive composition obtained in the examples and the comparative examples and the adhesive were measured by the following methods, and the measurement results are shown in Table 2.

1. Surface resistivity (Ω/□)

As for the polarizing plate to which each of the manufactured adhesives was adhered, the surface resistance at three points of the adhesive layer was measured ten times using a surface resistance meter (MCP-HT450, Mitsubishi Chemical), and then the measured values were averaged.

Thereafter, the polarizing plate to which the adhesive adhered was retained at 60 ° C for 24 hours. The above measurement was carried out in the same manner.

2. Heat resistance / heat and humidity resistance

The release film is peeled off from the polarizing plate adhered by the adhesive, and then the Corning glass is bonded to the surface of the adhesive layer. Thereafter, the obtained structure was retained at 80 ° C (heat resistance) / 60 ° C and 90 RH % (damp heat resistance name) for 300 hours, and then observed outside. View.

<Evaluation basis>

Significant recognition of bubbles or peeling: ×

Identify bubbles and peeling: △

The bubbles and peeling are slightly recognized, but the performance of the polarizing plate is maintained: ○

Unrecognizable bubbles and peeling: ◎

3. Corrosion resistance of metal layer

The release film is peeled off from the polarizing plate adhered by the adhesive, and then the aluminum plate is bonded to the surface of the adhesive layer. The resulting laminate was retained at 60 ° C and 90 RH% for 250 hours to prepare a sample.

The adhesive layer was peeled off from the laminate, and the surface of the aluminum plate was in contact with the adhesive layer by visual observation to evaluate the presence or absence of corrosion.

<Evaluation basis>

The surface of the aluminum plate is not corroded: ◎

The surface of the aluminum plate is slightly corroded, but its performance is retained: ○

The surface of the aluminum plate is corroded:

As is apparent from Table 2, the adhesive compositions according to Examples 1 to 15 of the present invention comprise an acrylic copolymer comprising an ionic monomer and an ionic antistatic agent. These adhesive compositions have antistatic properties and corrosion resistance equivalent to or superior to those shown in Comparative Examples 1 to 3, and they also have excellent durability and antistatic properties.

The adhesive composition of the present invention is free from the problems of migration, bubbling, delamination and the like due to migration of the antistatic agent to the surface, and thus has excellent durability and desirable antistatic properties.

The adhesive composition of the present invention can effectively inhibit the corrosion of the metal layer without the need to include an independent corrosion inhibitor.

Therefore, the adhesive composition is expected to be highly used in a plastic product which is liable to generate static electricity, and is used as an antistatic agent, particularly in the fields of electric/electronic equipment and the like.

Claims (9)

An adhesive composition comprising an acrylic copolymer comprising an ionic monomer of the following Chemical Formula 1 and an ionic antistatic agent: Wherein in Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; R ₂ is an aliphatic hydrocarbon group having at least 3 carbon atoms, with or without a hetero atom; R ₄ , R ₅ And R _{6 are} each independently an aliphatic hydrocarbon group having 1 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms; and adjacent substituents of R ₄ to R ₆ may be bonded to each other To form an alicyclic or aromatic ring. The adhesive composition according to claim 1, wherein in the ionic monomer of the above Chemical Formula 1, R ₁ is hydrogen or monomethyl; Y is O or -NH; and R ₂ is an alkyl group; 3 to 20 carbon atoms, with or without O, N, or S; R ₄ , R ₅ , and R _{6 are} each independently an alkyl group having 1 to 12 carbon atoms, or one having 6 to 12 The aromatic hydrocarbon group of one carbon atom; and the adjacent substituents of R ₄ to R ₆ are preferably bonded to each other to form a cycloaliphatic or aromatic ring. The adhesive composition according to claim 1, wherein an anion of the ionic monomer of the chemical formula 1 is selected from the group consisting of a fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodide ion. The adhesive composition according to claim 2, wherein the ionic monomer of the chemical formula 1 is at least one selected from the group consisting of Chemical Formulas 2 to 7 below: The adhesive composition according to claim 1, wherein the acrylic copolymer comprises a (meth) acrylate monomer having a carbon atom having 4 to 12 carbon atoms. An alkyl group and an ionic monomer of the chemical formula 1. The adhesive composition according to claim 5, wherein the ionic monomer of the chemical formula 1 is contained in an alkyl group having 4 to 12 carbon atoms, and the weight of the (meth) acrylate monomer per 100 parts A content of 0.5 to 30 parts by weight. The adhesive composition according to claim 1, wherein the ionic antistatic agent is an ionic salt consisting of: a cation selected from the group consisting of an alkali metal salt, a monoammonium salt, a cesium salt, and a group consisting of a phosphorus salt; and an anion selected from the group consisting of a fluorine-containing inorganic salt, a fluorine-containing organic salt, and an iodide ion. The adhesive composition according to claim 7, wherein the ionic antistatic agent is contained in an amount of from 0.1 to 15 parts by weight per 100 parts by weight of the acrylic copolymer. The adhesive composition of claim 1, further comprising a crosslinking agent.