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:
Sep. 19, 1978
Filed:
Nov. 01, 1976
Applicant:
Inventors:
Gerhard Henes, Leverkusen, DE;
Hans Jurgen Muller, Cologne, DE;
Pramod Gupta, Bedburg-Erft, DE;
Joachim Zirner, Leverkusen, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C08G / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
528 48 ; 260 / ; 260 / ; 2604 / ; 528 53 ; 528 73 ;
Abstract
This invention relates to a new process for the production, in inert organic solvents, of physiologically compatible polyisocyanates containing isocyanurate groups which have a monomeric diisocyanate content, based on solids, of at most 0.7%, by weight. The process uses Mannich bases as the trimerizing catalyst at temperatures below 60.degree. C and the reaction is terminated at the desired degree of trimerization by thermally decomposing the catalyst or by deactivating with a catalyst poison.