Bayer Materialscience Ag

Bayer Aktiengesellschaft

Frx Polymers, Inc.

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

Bayeraktiengesellschaft

Heraeus Precious Metals Gmbh & Co. Kg

Helmut-Werner Heuer

Rolf Wehrmann

Andreas Elschner

Alexander Meyer

Stephan Konrad

Horst Berneth

Friedrich-Karl Bruder

Pieter Ooms

Michael Erkelenz

Melanie Möthrath

Marc Buts

Johann Rechner

Michael Prein

Dieter Freitag

Ralf Neigl

Alexander Karbach

Lawino Kagumba

Karl-Heinz Köhler

Pin Go

Lydia Simon

Berit Krauter

Friedrich Jonas

Uwe Hucks

Harald Pielartzik

Thomas König

Ralf Hufen

Rafael Oser

Johan Vanden Eynde

Wolfgang Nising

Siegfried Anders

Anke Boumans

Ulrich Blaschke

Claus Rüdiger

Lothar Bunzel

Rüdiger Gorny

Christian Münnich

Martin Deussen

Jürgen Röhner

Thomas Pfingst

Bert Ruytinx

Marco Roelofs

Sylvia Braun

Peter Snobl

Heiner Onckels

Jos M J Paulusse

Martin H&uuml;ppauff

Frank Guldentops

Daniel Koch

The present invention relates to thermoplastic high-Tg polycarbonates and molding materials which are distinguished by improved thermal properties and improved mechanical properties, in particular by reduced thermal expansion. The present invention furthermore relates to a process for the preparation of these polycarbonates. In particular, this invention relates to polycarbonates which the structural unit which derives from phthalimide of the formula (I) and polycarbonate compositions and molding materials therefrom as well as a process for the preparation of these polycarbonates, and the use thereof, in particular as reflectors and display substrates.

Polycarbonate having improved thermal and mechanical properties and reduced coefficients of thermal expansion

The present invention relates to polycarbonate compositions and copolycarbonate compositions having improved optical properties, and to their production and their use for the production of shaped parts, and to shaped parts which can thereby be obtained, the compositions containing a polycarbonate or copolycarbonate which comprises bisphenol-A and at least one pair of a phosphorus compound having the oxidation number +3 and a phosphorus compound having the oxidation number +5, and the phosphorus compound having the oxidation state +5 in a pair respectively corresponding to the oxidized form of the phosphorus compound having the oxidation state +3 and the amount of more highly oxidized compound contained being less than that of the compound with the lower oxidation number.

Polycarbonate compositions having improved optical properties

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 relates to polycarbonates comprising imide-containing aryl mono- or dihydroxy compounds as chain terminators and, respectively, monomer units, and also to compositions comprising the said polycarbonates, to their use for the production of mouldings, and to mouldings obtainable therefrom.

Modified polycarbonates having improved surface properties

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 present invention relates to polycarbonate compositions having improved surface hardness, processes for the preparation thereof and the use thereof for the production of blends, shaped articles and extrudates.

Polycarbonate compositions having improved surface hardness

The present invention relates to copolycarbonates having improved surface hardness, processes for the preparation thereof and the use thereof for the production of blends, shaped articles and extrudates.

Copolycarbonates having improved surface hardness

The invention relates to the use of alkylphenols for adjusting the molecular weight of polycarbonates and compositions of these polycarbonates with additives chosen from the group of heat stabilizers, mold release agents and light stabilizers, the use thereof for the production of moldings and moldings obtainable therefrom.

Alkylphenol for adjusting the molecular weight, and polycarbonate compositions having improved properties

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 having improved rheological properties which are based on polycarbonate having rearrangement structures and cyclic and linear oligomers and also moldings and extrudates composed of these polycarbonate compositions.

Polycarbonates having rearrangement structures, cyclic and linear oligomers and also flow behavior

The invention relates to polycarbonates that comprise defect structures and cyclic oligomers and have improved properties. The invention also relates to molded articles and extrudates made from said polycarbonates.

Polycarbonates comprising cyclic oligomers and having an improved flow behavior

Copolycarbonates comprising alkylphenolchain terminator groups for adjusting the molecular weight, compositions of these copolycarbonates with additives chosen from the group of heat stabilizers and mold release agents, the use thereof for the production of moldings and moldings obtained therefrom.

Alkylphenol-terminated copolycarbonates, processes for preparing the same, molding compositions containing the same, and articles prepared therefrom

The present invention relates to a process for the continuous preparation of polycarbonates or diaryl carbonates by the method of the phase boundary process, in which both the mixing of the organic and aqueous phase and the upstream oligomerization step or aryl chloroformate and/or diaryl carbonate preparation step are effected in a special pump.

Process for the preparation of polycarbonates and diaryl carbonate

A multi-layer article is disclosed. The article contains a base layer that contains at least one thermoplastic resin and a second layer containing a thermoplastic (co)polyformal superimposed over the base layer. The (co)polyformal conforms to formulae (1) or (1), in which O-D-O and O-E-O independently denote a diphenolate group, -D- and -E- independently denote an aromatic group having 6 to 40 carbon atoms, k is a whole number from 1 to 1500, o stands for numbers from 1 to 1500, and m is z/o and n is (o-z)/o wherein z is 0 to o.

Polyformals as a coextrusion protective layer on polycarbonate

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Krefeld, Germany

Helmut-Werner Heuer