Optically compensated acrylic pressure-sensitive adhesive composition, polarizing plate and liquid crystal display device containing the same

摘要

The present invention relates to an acrylic pressure-sensitive adhesive composition, a polarizing plate and a liquid crystal display device, using the same. More specifically, the present invention relates to an acrylic pressure-sensitive adhesive composition having optimal stress releasing property which comprises an optically compensated acrylic copolymer (A) containing a cross-linkable functional group, an optically compensated acrylic copolymer (B) containing no cross-linkable functional group, and a multi-functional cross-linking agent (C). A polarizing plate and a liquid crystal display device comprising the pressure-sensitive adhesive composition meets with major properties such as adhesion endurance reliability, with effectively providing optical compensation effect and stress release effect, and has an effect of improving a light leakage phenomenon.

主权项

1. An acrylic pressure-sensitive adhesive composition for a polarizing plate comprising:
an acrylic copolymer (A) containing i) 50 to 75 parts by weight of an alkyl(meth)acrylic acid ester monomer having alkyl of 2 to 14 carbon atoms, ii) 25 to 50 parts by weight of an acrylic ester monomer including an aromatic group copolymerizable with said acrylic monomer, and iii) 0.1 to 10 parts by weight of a vinyl or acrylic monomer including a cross-linkable functional group with respect to 100 parts by weight of the acrylic copolymer (A); an acrylic copolymer (B), that does not contain a cross-linkable functional group, consisting of i) 50 to 75 parts by weight of an alkyl(meth)acrylic acid ester monomer having alkyl of 2 to 14 carbon atoms, and ii) 25 to 50 parts by weight of an acrylic ester monomer including an aromatic group copolymerizable with said acrylic monomer with respect to 100 parts by weight of the acrylic copolymer (B); and a multi-functional cross-linking agent (C) cross-linkable with an acrylic monomer including a cross-linkable functional group of iii) above; wherein a weight ratio of the acrylic copolymer (A) and the acrylic copolymer (B) is 1:9 to 4:1, and weight average molecular weights of acrylic copolymer (A) and acrylic copolymer (B) are each independently 800,000 to 2,000,000.