Patent · US Expired

Mixed anhydrides of isocyanates and carboxylic acids, mixtures thereof with carboxylic acids, and the use thereof as blowing agents for the production of cellular plastics

US4377644A · kind A · utility

6Cited by

7References

15Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Richard Kopp · Cologne, DE
Gerhard Grogler · Leverkusen, DE
Max Mann · Odenthal, DE

Key dates

Filing date	Oct 16, 1981
Grant date	Mar 22, 1983
Priority date	—
Expiry date	Oct 16, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J9/08
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

This invention relates to solid reaction products of aliphatic, cycloaliphatic or araliphatic mono- and/or polyisocyanates and organic, weakly acid mono- and/or polycarboxylic acids for the production of cellular plastics articles and particularly polyurethane foams. The products of the present invention may also be in the form of mixtures with carboxylic acids. The products are suitable for the production of cellular or porous plastics articles, but are preferably used in the preparation of cellular thermoplastic polyurethanes and semi-rigid and particularly rigid polyurethane integral skin foams having a compact outer skin formed by foaming the reaction mixture in closed molds.

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