Patent · US Expired

Process for the production of poly(O-alkylurethanes) of the diphenyl methane series

US5347034A · kind A · utility

4Cited by

2References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gunter Hammen · Dormagen, DE
Thomas Schieb · Rösrath, DE
Stefan Wershofen · Mönchengladbach, DE

Key dates

Filing date	Apr 21, 1992
Grant date	Sep 13, 1994
Priority date	—
Expiry date	Apr 21, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to an improved process for the production of monomeric and polymeric poly(O-alkylurethanes) of the diphenyl methane series. The process comprises the reaction of the corresponding amines with dialkyl carbonates in the presence of a catalyst, followed by the isolation of the products in a highly pure form. The invention also relates to the use of the produced monomeric and polymeric poly(O-alkylurethanes) for the production of the corresponding isocyanates.

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