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:
Dec. 07, 1982
Filed:
Dec. 09, 1981
Kazumasa Kamata, Ohtake, JP;
Kazuo Kishida, Ohtake, JP;
Kazuo Ueda, Ohtake, JP;
Norihisa Osaka, Nagoya, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
A composition with high impact resistance and little fish eyes content, comprising 97 to 60 parts by weight of a polyvinyl chloride-base resin and 3 to 40 parts by weight of a graft copolymer obtained by the three-stage graft-polymerization of 65 to 25 parts by weight of a monomer combination (B) comprising 12 to 57% by weight of methyl methacrylate, 1 to 24% by weight of at least one of alkyl acrylates having a C.sub.1-8 -alkyl group, 80 to 40% by weight of styrene and 0 to 3% by weight of a polyfunctional crosslinking agent having one or more alkyl groups in the molecule onto 35 to 75 parts by weight of a butadiene-base elastomer (A) containing 30% by weight or more of 1,3-butadiene units, said three-stage graft polymerization being carried out in the following way: at first at least one member selected from the group consisting of electrolytes and carboxyl-containing polymer latices is added to the reaction system; then in the first stage monomer mixture consisting of major amount of methyl methacrylate and minor amount of an alkyl acrylate or acrylates, which has a proportion of 50 to 90% by weight based on total weight of methyl methacrylate and alkyl acrylate or acrylates, and, if included in said monomer combination, a polyfunctional crosslinking agent are graft-polymerized; in the second stage, styrene is graft-polymerized; and in the third stage, the remaining 10 to 50% by weight of methyl methacrylate and an alkyl acrylate or acrylates are graft-polymerized.