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:
Apr. 26, 1994
Filed:
Mar. 27, 1992
Koji Matsumoto, Otake, JP;
Masaru Morimoto, Otake, JP;
Mitsubishi Rayon Company Ltd., Tokyo, JP;
Abstract
Rubber-containing graft copolymer particles excellent in powder properties are prepared by a process comprising mixing, with 100 parts by weight (as solid content) of rubber-containing graft copolymer (A) in a state of slurry, 0.1 to 10 parts by weight of a rigid non-elastic multi-stage polymer (B), in a state of slurry, consisting of 30 to 80% by weight of a (co)polymer component comprising 40 to 100% by weight of methyl methacrylate and 0 to 60% by weight of one or more other monomers copolymerizable therewith being polymerized at least in the first stage and 5 to 70% by weight of a (co)polymer component comprising 70 to 100% by weight of methyl methacrylate and 0 to 30% by weight of one or more other monomers copolymerizable therewith being polymerized in the final stage, the total amount of the (co)polymer components in the respective stages being 100% by weight and the content of polymeric units derived from an acrylic ester in the multi-stage polymer (B) being from 5 to 30% by weight.