PROCESS FOR PRODUCING MALEIMIDE COPOLYMER AND THERMOPLASTIC RESIN COMPOSITION COMPRISING THE COPOLYMER

WIPO Patent Application WO/1986/006732

A1

A process for producing a maleimide copolymer by emulsion polymerization of an aromatic vinyl monomer, a vinyl cyanide monomer, and a maleimide monomer in a specific mixture ratio, which comprises feeding an aromatic vinyl monomer in an amount more than a specified amount and, if necessary, a vinyl cyanide in an amount less than a specified amount before initiation of the polymerization, and adding continuously or by portions thereto, after initiation of the polymerization, the rest of the monomer mixture including the whole amount of a maleimide monomer, while keeping the pH of the aqueous phase of the polymerization system at 3 to 9 upon initiation of polymerization and using a redox catalyst comprising an oil-soluble organic peroxide. This process provides a maleimide copolymer having good heat resistance and heat decomposition resistance in a high yield. A thermoplastic resin composition prepared by compounding the maleimide copolymer with a rubber reinforced resin obtained by grafting a vinyl cyanide monomer to a specified elastomer in a specified proportion, which may optionally be further blended with a thermoplastic resin hard at room temperature, is also disclosed. The resin composition has excellent heat resistance, heat decomposition resistance, and impact resistance.

KISHIDA KAZUO (JP)
TOYOOKA YUTAKA (JP)
KIMURA ATSUSHI (JP)

PCT/JP1986/000252

November 20, 1986

May 16, 1986

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MITSUBISHI RAYON CO (JP)

C08F212/04; C08F222/40; C08L25/02; C08L51/04; (IPC1-7): C08F212/04; C08L25/02; C08L51/04

JPS59135210A	1984-08-03
JPS58162616A	1983-09-27
JPS52996B1	1977-01-11
US2971939A	1961-02-14

See also references of EP 0222924A1

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