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Bayer Materialscience Ag

Bayer Aktiengesellschaft

Bayer Technology Services Gmbh

Lars Obendorf

Frank Herre

Bernd Klinksiek

J&ouml;rg Hofmann

Wolfgang Ebert

Harald Pielartzik

Hans-Jürgen Nolte

Markus Mechtel

Harry Krumma

Jose F Pazos

Bert Klesczewski

Johan Vanden Eynde

Christoph Irle

Christian Kords

Rolf Gertzmann

Nusret Yuva

Christian Steinlein

Stephan Ehlers

Rolf Bachmann

Karlheinrich Meisel

Bernd Thiele

Bert Ruytinx

Gerd-Friedrich Renner

Martin Poggel

Reinhold Rose

Johann Seeba

Armin Spaniol

Dietmar Fuchs

Branislav Boehmer

Thomas Huebbe

Olaf Behrend

Continuous processes for preparing polycarbonates having a weight average molecular weight M, of 15,000 to 200,000 g/mol, the processes comprising reacting a dihydroxydiarylalkane and phosgene in the presence of a catalyst in a phase boundary process comprising: continuously dispersing in a disperser an organic phase comprising at least a portion of the phosgene and a solvent suitable for the polycarbonate and an aqueous phase comprising the dihydroxydiarylalkane, water and an alkali solution present in an amount of 1.5 to 2.5 moles per mole of the dihydroxydiarylalkane, to form a mixture; reacting the mixture in a first reactor with a residence time of less than 0.5 seconds; further reacting the mixture in a second reactor with addition of further alkali solution and, optionally, a chain terminator; and effecting further condensation in a third reactor with addition of further alkali solution and, optionally, a chain terminator, in the presence of the catalyst.

Phase boundary processes for preparing polycarbonates

A process for the continuous production of an aqueous polyurethane dispersion based on at least one aliphatic and/or aromatic polyisocyanate is described, which is characterised by the following steps:

Process for the continuous production of an aqueous polyurethane dispersion

A process for the preparation of polymeric condensates, wherein the reaction mixture is fed at least once during the condensation reaction through a zone of high energy density which has an energy density of at least 10J/m.

Process for the preparation of polymeric condensates and their use

The present invention relates to a process for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds containing active hydrogen atoms conducted in the presence of a double-metal cyanide catalyst wherein a reaction mixture is guided at least once through a zone which has an energy density of at least 10 J/m and wherein the residence time of the reaction mixture in this zone is at least 10 seconds per pass.

Process for the preparation of polyether polyols

The present invention relates to a process for the production of a polyether polyol by polyaddition of an alkylene oxide onto a starter compound containing active hydrogen atoms conducted in the presence of a double metal cyanide catalyst comprising conducting a reaction mixture at least once through a zone which has an energy density of at least 5&times;10 J/m , wherein the dwell time of the reaction mixture in this zone is at least 10 seconds per pass.

Process for producing polyether polyols

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Kö'ln, Germany

Lars Obendorf