Patent ID: 8911854

Claim:
An optical film comprising: a) an acrylic resin; and b) 20-65 parts by weight of a graft copolymer having a core-shell structure in which a conjugated diene-based rubber constitutes a core and an acrylic resin constitutes shell, based on 100 parts by weight of the acrylic resin, the graft copolymer b) including a graft copolymer having a particle size of 50 to 100 nm and a graft copolymer having a particle size of 200 to 400 nm, the acrylic resin a) including a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer; a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acid anhydride; and a copolymer of an acrylic monomer, an aromatic vinyl monomer, an acrylonitrile monomer and an acid anhydride; or a combination thereof, and the conjugated diene-based rubber including ethylene-propylene-diene rubber, butadiene rubber, or a combination thereof, wherein the weight ratio of the conjugated diene-based rubber to the acrylic resin in the graft copolymer b) is 15-45:85-55, and wherein the acrylic resin in the graft copolymer b) is a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer.