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. 06, 1980
Filed:
Feb. 28, 1978
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Abstract
A homopolymer or copolymer having extremely high weight-average molecular weight of about 3,000,000 to about 50,000,000 with a narrow molecular weight distribution is prepared by emulsion polymerization of at least one monomer of an aromatic alkenyl compound such as styrene, an .alpha.,.beta.-unsaturated carboxylic acid ester such as methyl methacrylate, or a conjugated diolefin such as butadiene or isoprene using an initiator consisting of (a) at least one peroxide of dialkyl peroxides and peroxy esters, and (b) at least one reducing agent such as alkyl primary amines, alkyl tertiary amines, polyalkylenepolyamines, alkylamino alcohols, and the like at a temperature of 0.degree. to 70.degree. C.