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:
Nov. 15, 1988
Filed:
Dec. 29, 1987
Applicant:
Inventors:
Masahiro Kouno, Manazurumachi, JP;
Akihiro Yamaguchi, Kamakura, JP;
Masanori Osawa, Yokohama, JP;
Kohei Shizuka, Fujisawa, JP;
Hiromi Nakano, Zushi, JP;
Kazumi Mizutani, Yokohama, JP;
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528 51 ; 528 52 ; 528 53 ;
Abstract
Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.