Bayer Materialscience Ag

Frx Polymers, Inc.

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Stephan Konrad

Helmut-Werner Heuer

Karl-Heinz Köhler

Michael Prein

Rolf Wehrmann

Pieter Ooms

Alexander Meyer

Johann Rechner

Wilfried Haese

Dieter Freitag

Lawino Kagumba

Pin Go

Christian Münnich

Marc Buts

Dieter Wittmann

Wolfgang Ebert

Ralf Hufen

Torsten Hagen

Berit Krauter

Daniel Koch

Pierre Moulinie

Heinrich Hähnsen

Uli Franz

Claus-Ludolf Schultz

Helmut Einberger

Frank Guldentops

Karl-Heinz KÖHLER

The invention relates to a polycarbonate composition having reduced subsequent yellowing of the mouldings produced therefrom on heat ageing and having good optical properties of the polycarbonate composition on processing.

Polycarbonate composition having improved heat stability

Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.

High molecular weight, random, bisphenol based copoly(phosphonate carbonate)s

The present invention is directed to a composition comprising a tris-hydroxyaryl compound having a metal ion impurity content of less than 10 ppm and to a process for the purification of tris-hydroxyaryl compound having a metal ion impurity, comprising at least the following steps:

Purification of tris-hydroxyaryl compounds

The present invention relates to an aromatic branched polycarbonate, produced via melt transesterification of a bisphenol with a diaryl carbonate in the presence of a branching agent, wherein the aromatic branched polycarbonate comprises branching point structures and structures of formula (D) wherein X is a single bond, C1- to C6-alkylene, C2- to C5-alkylidene or C5- to C6-cycloalkylidene, optionally substituted by C1- to C6-alkyl; wherein the amount of D in the aromatic branched polycarbonate is in the range of from 5 to 450 mg per kg of the aromatic branched polycarbonate; and wherein the ratio of the total branching point structures to the total structures of the formula D in the aromatic branched polycarbonate is in the range of from 8 to 200.

Branched melt polycarbonate with low content of defective structures

The invention relates to a polycarbonate composition with improved melt-flowability together with good optical properties and together with good hydrolysis resistance.

Polycarbonate composition with improved melt-flowability

The present invention relates to compositions comprising

Impact-modified polyalkylene terephthalate/polycarbonate compositions

The present invention provides a polycarbonate resin produced by the continuous interfacial process characterized in that after alkaline hydrolysis with sodium hydroxide, the polycarbonate resin contains an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1) said amount measured by high pressure liquid chromatography, wherein Rand Rindependently of one another denote hydrogen or C-C-alkyl, or together denote C-C-alkylidene, and Rand Rindependently of one another denote hydrogen. C-C-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, the process comprising phosgene reacting with at least one bisphenol at 8 to 17% molar excess of phosgene relative to the bisphenol.

Polycarbonates with good wettability

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

Growing community of inventors

Dormagen, Germany

Stephan Konrad