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:
Jun. 01, 2021
Filed:
Mar. 24, 2017
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
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;
Yousuke Shinkai, Tokyo, JP;
Keisuke Shimokawa, Tokyo, JP;
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Abstract
Provided is a manufacturing method for a high molecular weight aromatic polycarbonate resin that has superior fluidity and for which a good color and a sufficiently high molecular weight can be achieved. A manufacturing method for a high molecular weight aromatic polycarbonate resin includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is kept in a molten state, and is mixed with an aromatic polycarbonate prepolymer within ten hours after obtaining the catalyst composition, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.