Patent ID: 6509097
Filing Date: 2003-01-21
Classification: B32B,C08J,C08L,C09D,Y10T

Abstract:
An acrylic film, comprising:70 to 95 parts by weight of (A), an acrylic rubber-containing polymer; and 5 to 30 parts by weight of (B), an acrylic-based thermoplastic polymer; wherein a total amount of (A), the acrylic rubber-containing polymer, and (B), the acrylic-based thermoplastic polymer, is 100 parts by weight; wherein a gel content is 50 to 70% by weight; and wherein an elongation at break in one direction is 180% or more; wherein (A), the acrylic rubber-containing polymer, comprises (a) an elastic copolymer comprising 50 to 99.9% by weight of an alkyl ester of an acrylic acid monomer unit, 0 to 49.9% by weight of another copolymerizable vinyl monomer unit, and 0.1 to 10% by weight of a copolymerizable crosslinkable monomer unit, and (b) a monomer unit or a mixture thereof comprising 40 to 100% by weight of an ester of a methacrylic acid and 0 to 60% by weight of a vinyl monomer copolymerizable therewith; wherein (A), the acrylic rubber-containing polymer, has a glass transition temperature exceeding 65Â° C., a gel content of at least 60% by weight, a graft rubber particle diameter of 0.08 to 0.16 &mgr;m, and a calcium content of 50 to 500 ppm; and wherein the acrylic rubber-containing polymer (A) is obtained by graft-polymerizing 10 to 400 parts by weight of (b), the monomer unit or the mixture thereof, and 100 parts by weight of (a), the elastic copolymer, and wherein at least 10% of (b) the monomer unit or the mixture thereof is bonded to and is graft-polymerized onto (a), the elastic copolymer, and wherein (B), the acrylic-based thermoplastic polymer, comprises 50 to 100% by weight of an ester of a methacrylic acid monomer unit having an alkyl group of 1 to 4 carbon atoms, 0 to 50% by weight of an ester of an acrylic acid monomer unit, and 0 to 50% by weight of at least one other copolymerizable vinyl monomer unit; and wherein (B), the acrylic-based thermoplastic polymer, has a glass transition temperature of 65Â° C. or less and a weight average molecular weight of 100,000 to 300,000; and wherein the acrylic-based thermoplastic polymer (B) is different from a polymer component of an outermost layer polymer of the acrylic rubber-containing polymer (A).