Patent · US Expired

Process for the production of polyisocyanates of isocyanurate structure

US3996223A · kind A · utility

52Cited by

2References

11Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Pramod Gupta · Bedburg, DE
Roland Nast
Erwin Windemuth

Key dates

Filing date	Oct 28, 1975
Grant date	Dec 7, 1976
Priority date	—
Expiry date	Oct 28, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S521/902
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Soluble polyisocyanates of isocyanurate structure are produced by heating polyisocyanates in the presence of Mannich bases and carbamic acid esters of isocyanates and secondary alcohols. When such a process is used, the polymerization reactions begin without incubation times and the catalysts need not be inactivated by introducing additives because they deactivate themselves at high temperatures.

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