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. 26, 2001
Filed:
Oct. 13, 1999
Applicant:
Inventors:
Kazuki Hatono, Yamaguchi, JP;
Hiroaki Kaneko, Yamaguchi, JP;
Toru Sawaki, Yamaguchi, JP;
Katsushi Sasaki, Yamaguchi, JP;
Assignee:
Teijin Limited, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G 6/378 ;
U.S. Cl.
CPC ...
C08G 6/378 ;
Abstract
The purpose of this invention is to produce a stabilized terminal-blocked polycarbonate resin with a limited number of the terminal hydroxy groups having excellent thermal stability, color stability and hydrolysis resistance by an industrially advantageous method using a terminal blocking agent. In the production of a polycarbonate by the melt-polycondensation of an aromatic dihydroxy compound with an aromatic carbonic acid diester in the presence of a polycondensation catalyst, a terminal blocking agent expressed by the following formula (1)