Patent · US Expired

Process for the production of polyisocyanates containing isocyanurate groups

US4115373A · kind A · utility

27Cited by

5References

10Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gerhard Henes · Leverkusen, DE
Hans-Jurgen Muller · Solms, DE
Pramod Gupta · Bedburg, DE
Joachim Zirner

Key dates

Filing date	Nov 1, 1976
Grant date	Sep 19, 1978
Priority date	—
Expiry date	Nov 1, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/791
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.