Adhesive composition for polarizer plate, polarizer plate including adhesive layer including the same, and optical display including the same

摘要

An adhesive composition for a polarizer plate, the adhesive composition including a (meth)acrylic copolymer and a polyisocyanate curing agent containing an isocyanurate structure.

主权项

1. A polarizer plate comprising an adhesive layer formed from an adhesive composition, the adhesive composition comprising:
a (meth)acrylic copolymer; and a polyisocyanate curing agent containing an isocyanurate structure, wherein the polyisocyanate curing agent is represented by Formula 1: wherein R1, R2 and R3 are each independently a substituted or unsubstituted C1-C10 alkylene group, a substituted or unsubstituted C5-C10 cycloalkylene group, or a substituted or unsubstituted C6-C20 arylene group, wherein the polyisocyanate curing agent is present in an amount of 0.1 to 1 parts by weight based on 100 parts by weight of the (meth)acrylic copolymer, wherein the (meth)acrylic copolymer is a copolymer of a hydroxyl group-containing (meth)acrylic monomer and an alkyl group-containing (meth)acrylic monomer, and wherein a difference of Y1-Y2 ranges from about 300 μm to about 1500 μm, when Y1 represents a pushed distance of the adhesive layer measured at 70° C. by subjecting a sample to a load of 2250 gf for 1000 seconds, and Y2 represents a pushed distance of the adhesive layer measured at 25° C. by subjecting another sample to a load of 2250 gf for 1000 seconds, each of the samples being prepared by leaving the adhesive layer having a thickness of 20 μm at 35° C. and a relative humidity of 45% for 4 days to cure the adhesive layer, and cutting the cured adhesive layer into a 15 mm×15 mm piece, which in turn is attached to a glass substrate and left at 25° C. for 1 day.