Patent · US Active

Low chlorine, multi-staged method for producing cycloaliphatic disocyanates

US8536370B2 · kind B2 · utility

3Cited by

2References

45Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Gerda Grund · Coesfeld, DE
Manfred Kreczinski · Herne, DE
Stephan Kohlstruk · Marl, DE
Christian Lettmann · Coesfeld, DE

Key dates

Filing date	May 18, 2009
Grant date	Sep 17, 2013
Priority date	—
Expiry date	Apr 25, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C265/14
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.

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