Bayer Aktiengesellschaft

Miles Inc.

Bayer Corporation

Mobay Corporation

Klaus Kircher

Hans-Jurgen Kress

Klaus Horn

Wolfgang Ebert

Gerhard Fennhoff

Sivaram Krishnan

Helmut-Martin Meier

Ralf Hufen

Charles E Lundy

Rolf Dhein

Ludwig Bottenbruch

Burkhard Kohler

Ulrich R Grigo

Thomas Scholl

Richard Weider

Heinz Hammer

Johann Piontek

Christian Lindner

Karl-Heinz Ott

Rolf-Volker Meyer

Karsten-Josef Idel

Volker Serini

Harald Pielartzik

Dieter Neuray

Wolfgang Alewelt

Rudiger Schubart

Ernst Roos

Jurgen Kirsch

Mark W Witman

Wolfgang Cohnen

Rick L Archey

Klaus D Berg

Peter R Muller

Erich Eimers

Russell P Carter, Jr

Aaron D Meltzer

Holger Ohst

Dietrich Rathmann

Douglas G Powell

Udo Oels

Ulrich Koemm

Edwin Woldenberg

Helmut M Meier

Mark Witman

Helmut Pilzecker

Hans J Meissner

Ross Savage

Burkhart Kohler

Charles-Earl Lundy

The present invention provides polycarbonates stabilized against .gamma.-radiation and their use for the production of medical equipment.

Radiation-resistant polycarbonates

A thermoplastic molding composition stabilized against .gamma.-rays and its application for manufacture of medical equipment is disclosed. The composition contains an aromatic polycarbonate and (i) dialkyl and/or dicycloalkyl monosulfides or polysulfides in an amount of 0.001 to 5 weight %, and optionally (ii) aliphatic or cycloaliphatic monoalcohols or polyalcohols or their derivatives in an amount of 0.001 to 2 weight % said percent being relative to 100 weight % of aromatic polycarbonate.

A thermoplastic molding composition resistant to the degradation induced by ionizing-radiation is disclosed. The composition contains an aromatic polycondensate and an agent which is a compound conforming structurally to formula (I) ##STR1## or which is a member selected from the group consisting of oligocarbonate, polycarbonate, copolycarbonate, polyestercarbonate and polyesters which contain structural units conforming to formula (Ia) ##STR2## wherein R.sup.1 to R.sup.10 and X are defined. The composition is suitable for the manufacture of shaped articles, especially articles useful in medical applications.

Polycondensates which can be sterilized by .gamma.-radiation

The invention relates to silicon compounds, to mixtures thereof in aromatic polycarbonates and aromatic polyester carbonates and to their use as heat stabilizers in aromatic polycarbonates and aromatic polyester carbonates.

Heat stabilization or aromatic polycarbonates

Flame-resistant polycarbonate molding compositions containing halogen-free sulphonic acid salts of aromatic aldehydes or acetals of these aldehydes in quantities of about 0.005 to 10% relative to the total weight of the composition are disclosed. The compositions optionally further containing inorganic sulphates, exhibit flame retardance and little tendency to dripping in comparison to prior art compositions.

Flame-resistant polycarbonate molding compositions

A process for producing foamed articles containing thermoplastic aromatic polycarbonates is disclosed. Accordingly, thermoplastic aromatic polycarbonates are mixed with about 0.01 to 10% by weight of Al.sub.2 O.sub.3 (H.sub.2 O).sub.3 and the mixture is either extruded in an extruder at temperatures from 220.degree. C. to 320.degree. C. without application of a vacuum to produce foamed molded articles or it is injection molded in injection molding machines without application of vacuum at temperatures from 290.degree. C. to 330.degree. C. to produce molded foam articles.

Process for foaming thermoplastic polycarbonates

A thermoplastic molding composition containing a polycarbonate resin, glass fibers and oxidized polyethylene is disclosed. The composition is suitable for the preparation of molded articles having an improved level of impact strength.

Ternary mixtures

A thermoplastic molding composition containing a ternary mixture of (i) a polycarbonate and/or a polyester carbonate, (ii) glass fibers and (iii) a terpolymer of C.sub.2-8 olefine/acryllic acid ester/maleic acid anhydride is disclosed. The composition is suitable for molding articles having rigidity and toughness properties. A process for the preparation of the composition is also disclosed.

A process for the production of polycarbonate foam moldings is disclosed. Accordingly, a composition is prepared comprising mixing a thermoplastic polycarbonate resin and 0.01 to 1 mole-% of a transesterification catalyst and

Polycarbonate foam articles

A foamable thermoplastic molding composition comprising:

Polycarbonate foams

The invention relates to trimerized aliphatic isocyanates produced by special processes, to their use as mold release agents in thermoplastic aromatic polycarbonates and/or thermoplastic aromatic polyestercarbonates and/or thermoplastic aromatic polyesters, optionally using standard additives, to the readily demoldable molding compounds thus obtained on the basis of the thermoplastic polycarbonates, polyestercarbonates and/or polyesters and to processes for the production of these readily demoldable molding compounds.

Mold releasel agents for poly(ester) carbonates

The invention relates to a process for the production of carboxylic acid esters from carboxylic acids and alcohols which is characterized in that neutral phosphites containing oxetane groups are used as esterification catalysts.

Process for the production of carboxylic acid esters

Optionally substituted 3-benzalphthalides are effective UV stabilizers for thermoplastic aromatic polyesters, polycarbonates and polyester carbonates.

Use of 3-benzalphthalides as UV stabilizers for thermoplastic, aromatic

The present invention relates to phthalimide compounds of the formula (I) ##STR1## wherein X denotes H or halogen, for example chlorine or bromine,

Flameproofing agents, their preparation and their use for providing

The present invention relates to the use of perfluoroalkanesulphonic acid aryl esters as anti-drip agents in flame-repellant moulding compositions based on thermoplastic aromatic polycarbonates, moulding compositions containing flameproofing agents and these anti-drip agents and a process for the preparation of such moulding compositions.

Perfluoroalkanesulphonic acid aryl esters as anti-drip agents in

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Leverkusen, Germany

Klaus Kircher