Adhesive composition, adhesive optical film and image display device

An adhesive optical film comprising:

• an optical film;
• an adhesive layer laminated on at least one surface of the optical film;
• and
• an under coat layer containing an oxazoline group-containing polymer, which is interposed between the optical film and the adhesive layer.

An adhesive optical film comprising an optical film, an adhesive layer laminated on at least one surface of the optical film, and an under coat layer interposed between the optical film and the adhesive layer,

• the adhesive layer being made of an adhesive composition comprising, as raw monomers, an alkyl(meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer represented by the following general formula (1), and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein
• with respect to the proportion of the raw monomers, the amount of the alkyl (meth)acrylate ester is from 60 to 99 parts by weight based on 100 parts by weight of the total amount of the raw monomers, and the total proportion of the carboxyl group-containing vinyl monomer, the phosphoric acid group-containing vinyl monomer and the copolymerizable vinyl monomer is from 1 to 40 parts by weight based on 100 parts by weight of the total amount of the raw monomers, and
• the carboxyl group concentration is from 0.05 to 1.50 mmol/g and the phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers,
• the under coat layer has the oxazoline group-containing polymer:
• in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a polyoxyalkylene group represented by the following general formula (2), and X represents a phosphoric acid group or a salt thereof represented by the following general formula (3),
• in the general formula (2), n represents an integer of 1 to 4, and m represents an integer of 2 or more, and
• in the general formula (3), M1 and M2 each independently represents a hydrogen atom or a cation.

An adhesive optical film, comprising:

• an adhesive layer, the adhesive layer being made of an adhesive composition comprising, as raw monomers, an alkyl(meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer represented by the following general formula (1), and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein
• with respect to a proportion of the raw monomers, an amount of the alkyl(meth) acrylate ester is from 60 to 99 parts by weight based on 100 parts by weight of a total amount of the raw monomers, and a total proportion of the carboxyl group-containing vinyl monomer, the phosphoric acid group-containing vinyl monomer and the copolymerizable vinyl monomer is from 1 to 40 parts by weight based on 100 parts by weight of the total amount of the raw monomers, and
• a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers:
• in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a polyoxyalkylene group represented by the following general formula (2), and X represents a phosphoric acid group or a salt thereof represented by the following general formula (3)
• in the general formula (2), n represents an integer of 1 to 4, and m represents an integer of 2 or more, and
• in the general formula (3), M1 and M2 each independently represents a hydrogen atom or a cation.

An image display device, comprising:

• at least one adhesive optical film having an adhesive layer, the adhesive layer being made of an adhesive composition comprising, as raw monomers, an alkyl(meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer represented by the following general formula (1), and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein with respect to a proportion of the raw monomers, an amount of the alkyl(meth)acrylate ester is from 60 to 99 parts by weight based on 100 parts by weight of a total amount of the raw monomers, and a total proportion of the carboxyl group-containing vinyl monomer, the phosphoric acid group-containing vinyl monomer and the copolymerizable vinyl monomer is from 1 to 40 parts by weight based on 100 parts by weight of the total amount of the raw monomers, and a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers:
• in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a polyoxyalkylene group represented by the following general formula (2), and X represents a phosphoric acid group or a salt thereof represented by the following general formula (3)
• in the general formula (2), n represents an integer of 1 to 4, and m represents an integer of 2 or more, and
• in the general formula (3), M1 and M2 each independently represents a hydrogen atom or a cation.

An image display device comprising:

• an optical film;
• an adhesive layer laminated on at least one surface of the optical film;
• and
• at least one adhesive optical film having an under coat layer interposed between the optical film and the adhesive layer,
• the adhesive layer being made of an adhesive composition comprising, as raw monomers, an alkyl(meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer represented by the following general formula (1), and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein
• with respect to a proportion of the raw monomers, an amount of the alkyl(meth) acrylate ester is from 60 to 99 parts by weight based on 100 parts by weight of a total amount of the raw monomers, and a total proportion of the carboxyl group-containing vinyl monomer, the phosphoric acid group-containing vinyl monomer and the copolymerizable vinyl monomer is from 1 to 40 parts by weight based on 100 parts by weight of the total amount of the raw monomers, and
• a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers:
• in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a polyoxyalkylene group represented by the following general formula (2), and X represents a phosphoric acid group or a salt thereof represented by the following general formula (3)
• in the general formula (2), n represents an integer of 1 to 4, and m represents an integer of 2
• in the general formula (3), M1 and M2 each independently represents a hydrogen atom or a cation.