Patent · US Active

Method for producing light-coloured polyisocyanates

US9279029B2 · kind B2 · utility

1Cited by

10References

10Claims

0Family size

Assignee

Bayer Intellectual Property GmbH · DE

Inventors

Thomas Mueller · Leonberg, DE
Christoph Guertler · Cologne, DE
Axel Scherer-Werke · Itzehoe, DE
Stefan Wershofen · Mönchengladbach, DE
Henning Vogt · Aachen, DE
Walter Leitner · Aachen, DE

Key dates

Filing date	Oct 18, 2012
Grant date	Mar 8, 2016
Priority date	—
Expiry date	Oct 18, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for producing light-coloured polyisocyanates by phosgenation of mixtures comprising MDA and polycyclic aromatic polyamines that have o-phenylenediamine units incorporated via methylene bridges. The invention further relates to the polyisocyanate mixtures obtainable by this method.

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