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:
Oct. 04, 2016
Filed:
Nov. 15, 2013
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Yoshinori Isahaya, Ibaraki, JP;
Atsushi Hirashima, Chiba, JP;
Hidefumi Harada, Hyogo, JP;
Maki Ito, Ibaraki, JP;
Jun-ya Hayakawa, Chiba, JP;
Takehiko Isobe, Chiba, JP;
Taichi Tokutake, Tokyo, JP;
Yousuke Shinkai, Chiba, JP;
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Abstract
The present invention provides a process for preparing a highly polymerized aromatic polycarbonate resin which not only has excellent quality such that it has high molecular weight and high fluidity, but also has more excellent heat resistance. The process of the present invention comprises a highly polymerizing step for reacting an aromatic polycarbonate prepolymer with an aliphatic diol compound of the following formula (I) having hydroxymethyl groups (HO—CH—) each bonded to a quaternary carbon atom in the presence of a transesterification catalyst to obtain a highly polymerized aromatic polycarbonate resin: wherein Ra to Rf, n, and m are as defined in the present specification and claims.