Methacrylic acid ester resin composition and film made thereof

A methacrylate resin composition comprising:

• (A) 5 to 50% by weight of a crosslinked acrylate elastomer comprising (a-1) 20 to 80% by weight of a crosslinked polymer component having a glass transition temperature of −30 to 10° C. and obtained by polymerization of a monomer mixture containing 50 to 80% by weight of an alkyl acrylate and 50 to 20% by weight of an alkyl methacrylate and 0.1 to 20 parts by weight, per 100 parts by weight of said monomer mixture, of a polyfunctional monomer having at least two non-conjugated double bonds per molecule and copolymerizable with said monomer mixture, and (a-2) 80 to 20% by weight of a crosslinked polymer component having a glass transition temperature of less than −30° C. and obtained by the polymerization of a monomer containing 80 to 100% by weight of an alkyl acrylate and 0 to 20% by weight of an alkyl methacrylate and 0.1 to 20 parts by weight, per 100 parts by weight of said monomer, of a polyfunctional monomer having at least two non-conjugated double bonds per molecule and copolymerizable with said monomer, wherein said crosslinked acrylate elastomer (A) has a two layer structure comprising said component (a-1) located on the inner side and said component (a-2) located on the outer side, or a two layer structure comprising said component (a-2) located on the inner side and said component (a-1) located on the outer side, and
• (B) 95 to 50% by weight of an alkyl methacrylate polymer prepared by polymerizing an acrylic monomer containing 80 to 100% by weight of an alkyl methacrylate and 20 to 0% by weight of an alkyl acrylate in the presence of 0.01 to 10 parts by weight of a chain transfer agent per 100 parts by weight of said acrylic monomer.