Mitsubishi Rayon Company, Limited

Katsutoshi Kajimura

Yutaka Toyooka

Atsushi Kimura

Yasunori Tsuneshige

A maleimide copolymer which consists essentially of greater than 28% by weight and less than or equal to 65% by weight of a maleimide monomer unit, greater than or equal to 16% by weight and less than 72% by weight of at least one monomer unit selected from the group consisting of aromatic vinyl compound monomer units and methacrylate monomer units, and 0-25% by weight of another vinyl compound monomer unit and which contains 0.1% by weight or less of the residual maleimide monomer and 0.5% by weight or less of volatile components other than the maleimide monomer and which has a ratio (Mw/Mn) of a weight average molecular weight Mw to a number average molecular weight Mn of 3 or less, a yellowness index of 30 or less and an intrinsic viscosity of from 0.3 to 1.5. The maleimide copolymer of the present invention is excellent in heat resistance, transparency, chemical resistance, impact resistance, moldability and the like.

Maleimide copolymer and a process for producing the same

A heat resistant and impact resistant resin composition is disclosed which composition comprises 5 to 95 parts by weight of a maleimide copolymer (A) prepared by continuous polymerization in the absence of water, containing only small amounts of residual monomers and volatile components, and having a Mw/Mn of not greater than 3, a yellow index of not greater than 30, and an intrinsic viscosity of 0.3 to 1.5, and 5 to 95 parts by weight of a rubber-reinforced resin (B).

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Tokyo, Japan

Katsutoshi Kajimura