Bayer Aktiengesellschaft

Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Claus-Ludolf Schultz

Heinz Pudleiner

Alexander Meyer

Knud Reuter

Uwe Hucks

Wilfried Haese

Stephan Konrad

Annett K&ouml;nig

Ute Wollborn

G&uuml;nther Jeromin

Polycarbonate resin containing small amounts of carbamate compounds is disclosed. The resin that contains at least one of compounds conforming to whereinRand Rindependently of one another denote hydrogen or C-C-alkyl, or together denote C-C-alkylidene, Rand Rindependently of one another represent hydrogen, C-C-alkyl, or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, and Rdenotes hydrogen, C-C-alkyl, C-C-cycloalkyl, phenyl or cumyl, are characterized by their low electrostatic field and therefore suitable for making optical storage media.

Polycarbonates having a good wettability

A process for the production of polyether block copolysulfones via trans-etherification is disclosed. In the inventive process, an aromatic sulfone polymer is reacted with an aliphatic polyether having on average at least one terminal OH function, preferably in the presence of a basic catalyst. In a preferred embodiment the reaction is carried out in a dipolar aprotic solvent.

Process for the production of polyether block copolysulfones

The present invention relates to a transesterification method for producing solvent-free polycarbonate, using N-alkyl-substituted piperidines or N-alkyl-substituted morpholines comprising C,-C,N-alkyl substituents, preferably C,-C,N-alkyl substituents, most preferably C,-C,N-alkyl substituents, as catalysts.

Method for producing polycarbonate

Growing community of inventors

Krefeld, Germany

Claus-Ludolf Schultz