The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 1984
Filed:
Sep. 23, 1982
Mitsuo Abe, Yokkaichi, JP;
Syuji Tsuchikawa, Yokkaichi, JP;
Teizo Fukuta, Yokkaichi, JP;
Tsugio Asakawa, Suzuka, JP;
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Abstract
A thermoplastic resin having an excellent thermal stability and a high heat resistance is prepared by initiating polymerization of 65-85 parts by weight of a monomer mixture (A) consisting of 50-85% by weight of .alpha.-methylstyrene, 3-20% by weight of methyl methacrylate, 2-20% by weight of acrylonitrile, and 0-25% by weight of an aromatic alkenyl compound other than .alpha.-methylstyrene, continuously or intermittently adding, on the way of the polymerization, 2-15 parts by weight of a monomer (B) consisting of acrylonitrile or a mixture thereof with an aromatic alkenyl compound other than .alpha.-methylstyrene to the polymerization system while continuing the polymerization, further adding to the polymerization system 5-25 parts by weight of a monomer (C) consisting of an aromatic alkenyl compound other than .alpha.-methylstyrene, or a mixture thereof with acrylonitrile, and continuing the polymerization to complete the polymerization, the total amount of monomers (A), (B), and (C) being 100 parts by weight. Further, a thermoplastic resin composition having an excellent thermal stability, a high heat resistance and a high impact strength is prepared by mixing the thermoplastic resin thus obtained with a graft copolymer obtained by grafting 60-30 parts by weight of a monomer mixture consisting of 65-80% by weight of an aromatic alkenyl compound and 35-20% by weight of acrylonitrile on 40-70 parts by weight of a diene rubbery polymer in such a proportion that the composition contains 10-30% by weight of the rubbery polymer.