Bayer Aktiengesellschaft

Bayer Polymers LLC

Helmut Greiving

Manfred Jautelat

Jan Weikard

Herbert Hugl

Martin Melchiors

Michael Schelhaas

Rolf Gertzmann

Ulrich Freudenberg

Christoph G&uuml;rtler

Peter J Miller

The invention relates to water-dilutable polyurethanes containing structural units derived from 3,4-epoxy-1-butene and also to aqueous dispersions comprising these polyurethanes, to a process for preparing them and to use as aqueous oxidatively drying and/or UV-crosslinking coating compositions.

Aqueous coating compositions based on epoxybutene polyethers

The invention relates to a process for preparing a polymer by polymerizing a component containing 3,4-epoxy-1-butene in the presence of a double metal cyanide (DMC) catalyst and a hydroxy-functional starter and it also relates to the obtained polymers.

Process for preparing a polymer from 3,4-epoxy-1-butene

A process for preparing aliphatic C &agr;,&ohgr;-dicarboxylic acids by oxidation of C &agr;,&ohgr;-dienes with hydrogen peroxide or compounds which release hydrogen peroxide under the reaction conditions as is characterized in that the reaction is carried out in the presence of a transition metal catalyst of group VI and of a mixture containing at least one organic acid and one aprotic organic solvent. A specific temperature profile is maintained at different phases of the reaction, which increases yield and selectivity.

Preparation of aliphatic &agr;, &ohgr;-dicarboxylic acids

Using the process according to the invention, it is possible to provide, with few reaction steps, a novel route to &agr;-substituted ring systems which optionally have further substituents.

Process for synthesizing khi-substituted ring systems

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Wuppertal, Germany

Helmut Greiving