Patent · US Expired

Process for the production of isocyanurate polyisocyanates, and products by the process

US4255569A · kind A · utility

46Cited by

8References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hans-Jurgen Muller · Solms, DE
Rudolf Hombach · Leverkusen, DE
Manfred Dollhausen · Odenthal, DE
Joachim Zirner

Key dates

Filing date	May 4, 1979
Grant date	Mar 10, 1981
Priority date	—
Expiry date	May 4, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09J175/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The instant invention is directed to a process for the production of isocyanate polyisocyanates containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of isocyanurate-free diisocyanate. The process comprises catalytically trimerizing the organic diisocyanates free from isocyanurate groups and terminating the trimerization reaction by deactivation of the catalyst after 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized. The unreacted isocyanurate-free diisocyanate is then distilled off in the presence of from 1 to 30%, by weight, based on the end product obtained as distillation residue, of an inert liquid distillation aid which boils at a temperature at least 50.degree. C. above the boiling point of the isocyanurate-free diisocyanate. The invention is also directed to the products produced by this process.

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