Bayer Aktiengesellschaft

Andreas Schlemenat

Herbert Witossek

J&ouml;rg Laue

J&ouml;rg Tillack

Jörg Tillack

Jörg Laue

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.

Process for producing aliphatic oligocarbonate diols

A process for the production of aliphatic oligocarbonate diols is disclosed. The optionally catalyzed high yield process entails the multistage transesterification of aliphatic diols with dimethyl carbonate. In the process DMC-methanol mixtures that have been distilled off are recycled to the reaction solution with further conversion and depletion of the contained DMC in the same or in a following reaction batch.

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Krefeld, Germany

Andreas Schlemenat