Bayer Aktiengesellschaft

Bayer Materialscience Ag

Herbert Witossek

Steffen Hofacker

Andreas Schlemenat

Lothar Bäcker

Rolf Bachmann

J&ouml;rg Laue

J&ouml;rg Tillack

Wolfgang Fischer

Jan Weikard

Jörg Tillack

Manfred M&uuml;ller

Thomas F&auml;cke

Jörg Laue

Manfred Müller

Thomas FÄCKE

Thomas Faecke

Manfred Mueller

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

Preparation of aliphatic oligocarbonate diols

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

Preparation of aliphatic oligocarbonate polyols

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.

Method for producing aliphatic oligocarbonate diols

The invention relates to new, low viscosity radiation-hardenable urethane acrylates prepared from oxalkylated polyols with 25 to 75 mole % of a polyol having a degree of oxalkylation between 3 and 5 and 75 to 25 mole % of a polyol having a degree of oxalkylation between 8 and 25, the resulting coatings having improved abrasion resistance, as well as their use as coating compositions, in particular for flooring materials.

Radiation-hardening coating compositions

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Leipzig, Germany

Herbert Witossek