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:
Jul. 07, 1987
Filed:
Mar. 04, 1985
Applicant:
Inventors:
Tamae Yoshizawa, Kurashiki, JP;
Kiyoto Otsuka, Kurashiki, JP;
Shiro Nagata, Kurashiki, JP;
Hideo Takamatsu, Hasaki, JP;
Assignee:
Kuraray Company, Ltd., Kurashiki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525353 ; 5253331 ; 5253332 ; 525371 ;
Abstract
A method of producing a cyclized polydiene comprising cyclizing a polydiene in an organic solvent with the aid of a binary catalyst comprising tin halide or titanium halide and an organosulfonic acid or a haloacetic acid. The method provides a cyclized polydiene having a narrow molecular weight distribution in a short reaction time and with high reproducibility. The method does not entail side reactions causing gelation or discoloration.