PROCESS FOR PRODUCING MALEIMIDE COPOLYMER, AND THERMOPLASTIC RESIN PREPARED BY USING SAID COPOLYMER

摘要

A process for producing maleimide copolymer, which comprises conducting suspension polymerization of a maleimide monomer and at least one monomer selected from the group consisting of an aromatic vinyl monomer, vinyl cyanide monomer, and methyl methacrylate monomer by using a calcium phosphate dispersing agent as a suspending and dispersing agent and dissolving a phosphate nonionic surfactant in the monomers. This process serves to stabilize the polymerization system and minimize adhesion of resulting polymer to the inside wall of a polymerization tank. A thermoplastic resin composition is also disclosed, which is prepared by blending the above-described maleimide copolymer with a specific rubber-modified graft copolymer. This resin composition has excellent heat stability upon high-temperature molding and resistance to coloration, heat and impact.