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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.:

US 5527875 B1

PDFFull Text
Date of Patent:
Jun. 18, 1996

Filed:

Feb. 09, 1995

Process for producing aromatic polycarbonate

Applicant:
Inventors:

Masuzo Yokoyama, Mie, JP;

Fumio Keitoku, Mie, JP;

Junji Takano, Mie, JP;

Masami Hasegawa, Mie, JP;

Yukiko Tatsukawa, Mie, JP;

Assignee:

Mitsubishi Chemical Corporation, Tokyo, JP;

Attorney:

Dilworth & Barrese

Primary Examiner:

James J Seidleck

Assistant Examiner:

Terressa Mosley

Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528196 ; 528198 ; 528200 ; 528204 ; 502150 ; 502152 ; 502157 ; 502164 ; 502171 ;
Abstract

A process for producing an aromatic polycarbonate having a weight average molecular weight of from 7,000 to 60,000 is disclosed, comprising melt polycondensing an aromatic diol compound (e.g., bisphenol A) and a diaryl carbonate compound (e.g., diphenyl carbonate) in the presence of a combination of (a) an alkali metal compound and (b) a phosphonium hydroxide compound (e.g., tetraethylphosphonium hydroxide) as an interesterification catalyst. The aromatic polycarbonate has improved heat resistance and hue.

Find Patent Forward Citations

Yokoyama, Masuzo. (1996). Process for producing aromatic polycarbonate (U.S. Patent No. 5527875). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5527875

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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