Covestro Deutschland Ag

Bayer Aktiengesellschaft

Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Frank Bruynseels

Johann Rechner

Johan Vanden Eynde

Thomas König

Michael Bierdel

Bert Ruytinx

Ing Johan Vaes

Wolfgang Ebert

Wolfgang Alewelt

Ulrich Liesenfelder

Klemens Kohlgrüber

Jörg Kirchhoff

Torsten Hagen

Jan Heijl

Thomas Koenig

Stefan Westernacher

Erik Sluyts

Ursula Tracht

Johan Vaes

Joerg Kirchhoff

Stephan Laue

Klemens Kohlgrueber

Frank Doebert

Andreas Stremmel

Christoph Biedron

Frank Quaeyhaegens

Johan Decloedt

Paul Van Dorst

Uwe Arndt

Ivan Sluijs

Thomas Fritz

Dirk Jahn

The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same

The present invention relates to a melt transesterification process for the production of (co)polycarbonates from diaryl carbonates and cycloalkylidene diphenols, which process comprises the addition of a monohydroxyaryl compound in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture. The invention further relates to a (co)polycarbonate obtained by the process.

Preparation of highly heat-resistant (co)polycarbonates by the transesterification method

The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discolored and is free of insoluble constituents.

Process and apparatus for the preparation of polycarbonate

The present invention relates to a process for working up solutions of polymers in organic solvents contaminated by alkaline constituents, using homogeneously soluble acids, especially by the introduction of an acid gas, and subsequent washing, and to the polymers so obtainable, which are distinguished by the fact that, on treatment with moist heat (sterilisation), only few defects caused by decomposition are formed, to the use thereof in the production of extrudates and molded specimen, and to the extrudates and molded specimen produced from those polymers themselves.

Working up of polymer synthesis solutions

Growing community of inventors

Sint Gillis, Belgium

Frank Bruynseels