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.
Type:
Grant
Filed:
June 26, 2002
Date of Patent:
November 16, 2004
Assignee:
Bayer Aktiengesellschaft
Inventors:
Jörg Tillack, Jörg Laue, Herbert Witossek, Andreas Schlemenat