Mitsubishi Rayon Company, Limited

Hirofumi Uno

Jun Nakauchi

Akihiro Toritani

Kaoru Matsuda

A multilayered acrylic polymer comprising an innermost layer polymer (A) formed from a C,alkyl methacrylate, a C,alkyl acrylate, etc., an intermediate layer polymer (B) formed from a C,alkyl acrylate, an aromatic vinyl monomer, etc., and an outermost layer polymer (C) formed from a C,alkyl methacrylate, a C,alkyl acrylate, etc., and wherein the average value of the coating ratio, i.e. &lsqb;(minimum thickness of the intermediate layer)&divide;(maximum thickness of the intermediate layer)&rsqb;&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.

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

Acrylic multilayer polymer powders containing coagulated powders of emulsified latexes of acrylic multilayer polymers, which are suitable for drying methods using pressure dehydration extruders, etc, comprises not more than 40 wt % of a fine powder of a particle size of 212 .mu.m or less after drying, and have a volume of gaps of a pore size of 5 .mu.m or less after drying of not more than 0.7 cc per unit weight as measured by a mercurial pressure method. A desired monomer is subjected to emulsion polymerization to produce an emulsified latex of an acrylic multilayer polymer, which is then poured into a coagulating solution for coagulation.

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