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. 11, 2017
Filed:
Aug. 07, 2013
Applicant:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Inventors:
Yoshinori Isahaya, Tokyo, JP;
Atsushi Hirashima, Tokyo, JP;
Hidefumi Harada, Tokyo, JP;
Maki Ito, Tokyo, JP;
Jun-ya Hayakawa, Tokyo, JP;
Takehiko Isobe, Tokyo, JP;
Taichi Tokutake, Tokyo, JP;
Yousuke Shinkai, Tokyo, JP;
Assignee:
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/06 (2006.01); C08G 64/14 (2006.01); C08G 63/00 (2006.01);
U.S. Cl.
CPC ...
C08G 64/14 (2013.01);
Abstract
The present invention provides a method for producing a branched aromatic polycarbonate resin that is molecular weight-increased, which comprises subjecting an aromatic polycarbonate prepolymer and a linking agent comprising a trifunctional or more of an aliphatic polyol compound to transesterification reaction in the presence of a transesterification catalyst under a reduced pressure condition.