Patent · US Expired

Cycloaliphatic diisocyanates, optionally in the form of isomeric mixtures and a process for their preparation

US4879409A · kind A · utility

3Cited by

3References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hartmut Knofel · Odenthal, DE
Michael Brockelt · Bensberg, DE
Stefan Penninger · Pulheim, DE
Herbert Stutz · Karlsruhe, DE

Key dates

Filing date	Apr 7, 1987
Grant date	Nov 7, 1989
Priority date	—
Expiry date	Apr 7, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/758
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A diisocyanate corresponding to the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, m and n are as defined herein is prepared by phosgenating a diamine corresponding to the formula ##STR2## in which R.sup.1, R.sup.2, R.sup.3, m and n are as defined herein. The diisocyanate may contain C.sub.1 -C.sub.12 -monoalkyl-substituted methylene-bis-(cyclohexylisocyanate)isomers in an amount of up to 40 wt. %. These new diisocyanates which are liquid at room temperature and compatible with polyols are particularly useful in the production of polyurethanes.

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