Patent · US Expired

Process for producing aliphatic oligocarbonate diols

US6818784B2 · kind B2 · utility

7Cited by

11References

28Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Jörg Tillack · Bensberg, DE
Jörg Laue · Olfen, DE
Herbert Witossek · Leipzig, DE
Andreas Schlemenat · Neuss, DE

Key dates

Filing date	Jun 26, 2002
Grant date	Nov 16, 2004
Priority date	—
Expiry date	Oct 18, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/305
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.

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