Patent Number: 6,310,137

Title: Acrylic polymer having multilayer structure and methacrylic resin composition containing the same

Abstract: A multilayered acrylic polymer comprising an innermost layer polymer (A) formed from a C.sub.1-4 alkyl methacrylate, a C.sub.1-8 alkyl acrylate, etc., an intermediate layer polymer (B) formed from a C.sub.1-8 alkyl acrylate, an aromatic vinyl monomer, etc., and an outermost layer polymer (C) formed from a C.sub.1-4 alkyl methacrylate, a C.sub.1-8 alkyl acrylate, etc., and wherein the average value of the coating ratio, i.e. [(minimum thickness of the intermediate layer).div.(maximum thickness of the intermediate layer)].times.100, is not less than 30%; and a methacrylic resin composition containing the same. This multilayered acrylic polymer can improve the falling-ball or falling-weight impact strength, resistance to impact whitening, transparency and other properties of the methacrylic resin composition.

Inventors: Uno; Hirofumi (New York, NY), Nakauchi; Jun (Tokyo, JP)

Assignee: Mitsubishi Rayon Co., Ltd.

International Classification: C08F 285/00 (20060101); C08L 051/06 (); C08L 033/06 (); C08L 033/12 ()

Expiration Date: 10/30/2018