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:
Sep. 04, 1979
Filed:
Nov. 11, 1976
Applicant:
Inventors:
Masaki Kambe, Fujisawa, JP;
Tadamichi Takada, Yokohama, JP;
Nobuyuki Miyazaki, Fujisawa, JP;
Masanori Yokokawa, Fujisawa, JP;
Shohei Inoue, Tokyo, JP;
Assignee:
Nippon Oil Seal Industry Company Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528405 ; 528413 ;
Abstract
A copolymer having carbonate linkages is produced by copolymerizing an epoxy compound with carbon dioxide in the presence of an isoprene-magnesium complex compound or a reaction mixture of said complex compound with an active hydrogen compound as a catalyst. The catalyst has a much improved polymerization activity when treated with carbon dioxide in advance.