Patent · US Expired

Preparation of aliphatic oligocarbonate diols

US7238825B2 · kind B2 · utility

0Cited by

1References

3Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Steffen Hofacker · Rockenberg, DE
Rolf Bachmann · Busswil, CH
Lothar Backer · Gräfenhainichen, DE
Herbert Witossek · Leipzig, DE

Key dates

Filing date	Sep 15, 2004
Grant date	Jul 3, 2007
Priority date	—
Expiry date	Sep 25, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/0208
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.

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