Bayer Aktiengesellschaft

Bayer Corporation

Robert-Joseph Kumpf

Pieter Ooms

Pramod Gupta

J&ouml;rg Hofmann

Walter Sch&auml;fer

Burkhard Kohler

Harald Pielartzik

Yun Chen

Duane B Priddy, Jr

Michael Schneider

Double-metal cyanide catalysts containing polyester for preparing polyether polyols

The present invention relates to highly active, substantially crystalline double metal cyanide (DMC) catalysts, a process for the preparation of these double metal cyanide catalysts, a process for producing polyether polyols by the polyaddition of alcohol ethers onto starter compounds containing active hydrogen atoms from these DMC catalysts, and to the polyether polyols produced by this process. The DMC catalysts of the invention comprise a) double metal cyanide compounds, b) organic complexing ligands, and c) functionalized polymers. These catalysts exhibit increased activity in the process for the production of polyether polyols.

Crystalline double metal cyanide catalysts for producing polyether polyols

A process for the manufacture of cyclic oligocarbonate is disclosed. The process comprises a reaction of a bis-chlorocarbonic acid ester with isatinbisphenol or with a bis-chlorocarbonic ester thereof. The mixture of cyclic oligocarbonates thus prepared is useful as a precursor in the preparation of modified polycarbonate or polyester resins.

Mixtures of cyclic oligocarbonates and their manufacture

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Düsseldorf, Germany

Robert-Joseph Kumpf