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:
Mar. 03, 2015
Filed:
Feb. 09, 2012
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, 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, Tokyo, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A branched aromatic polycarbonate resin having a degree of branching (N value) controlled within a specific range is manufactured by subjecting an aromatic polycarbonate prepolymer that has a branched structure introduced using a specific amount of a branching agent to molecular-weight-increasing linking reaction with an aliphatic diol compound in the presence of a transesterification catalyst under the condition of a reduced pressure. The amount (A) of the branching agent used is adjusted on the basis of the correlation between the amount (A) of the branching agent used and the N value of the branched aromatic polycarbonate resin.