Pressure-sensitive adhesive composition, pressure-sensitive adhesive and optical film

摘要

A pressure-sensitive adhesive composition which is excellent in durability under high temperature and humidity conditions and can thus inhibit bright defect even when applied to a large-sized optical film; a pressure-sensitive adhesive; and an optical film. A pressure-sensitive adhesive composition including an acrylic copolymer (A) bearing a reactive functional group, an acrylic copolymer (B) and an isocyanate compound (C), wherein the quantity of the isocyanate compound (C) is 5 to 30 parts by weight per 100 parts by weight of a mixture of the acrylic copolymer (A) and the acrylic copolymer (B) and the elongation at break and 200% modulus as determined at 25 degrees C. by the tensile test are 300 to 1000% and 0.2 to 3 N/mm2 respectively.

主权项

1. A pressure-sensitive adhesive composition comprising an acrylic copolymer (A) and an acrylic copolymer (B) that have a reactive functional group respectively, and an isocyanate compound (C), wherein the isocyanate compound (C) is added in an amount of 6 to 30 parts by weight per 100 parts by weight of a mixture of the acrylic copolymer (A) and the acrylic copolymer (B), wherein the acrylic copolymer (A) contains 0.5 to 5% by weight of a carboxyl group containing monomer containing a carboxyl group as the reactive functional group, and not more than 1% by weight of a hydroxyl group containing monomer containing a hydroxyl group as the reactive functional group, as a component of the copolymer,
wherein the acrylic copolymer (B) contains 0.1 to 5% by weight of a carboxyl group containing monomer containing a carboxyl group as the reactive functional group, and 0.3 to 5% by weight of a hydroxyl group containing monomer containing a hydroxyl group as the reactive functional group, as components of the copolymer, wherein the acrylic copolymer (A) and the acrylic copolymer (B) are contained in a weight ratio of 60/40 to 99/1.