Bayer Aktiengesellschaft

Siegfried Adelmann

Dieter Margotte

Hugo Vernaleken

Werner Nouvertne

Dieter Freitag

Josef Merten

Manfred Schreckenberg

Hans Niederprum

Frank Gerald Kleiner

Johann Nikolaus Meussdoerffer

Hans Rudolph

Hans J Rosenkranz

Alfred Pischtschan

Hans-Eberhard Braese

Dietrich Hardt

Hans-Heribert Burgdorfer

Gunther Lehnert

Werner Nouverine

This development is concerned with an improved process of preparing polycarbonate molding compositions and molded articles having superior hydrolysis resistance, stress crack resistance and flame retardancy, by thermoplastically processing a partially crosslinked aromatic polycarbonate. A crosslinkable aromatic thermoplastic polycarbonate is subject to irradiation to cause crosslinking on its surface such that between about 5 and 50 wt. % of the polymer is crosslinked and it is then thermoplastically processed. This partially crosslinked polycarbonate may be blended with uncrosslinked thermoplastic aromatic polycarbonate or known flame retardant agents. This development is also concerned with the compositions or articles so produced.

Process for the preparation of modified polycarbonate molding

The present invention is directed to cross-linkable, thermoplastically processable, segmented, high molecular weight polycarbonate elastomers, to the process for their preparation and to their use in their cross-linked form.

Cross-linkable polycarbonate elastomers, a process for their preparation

Thermoplastic molding compositions are provided comprising from about 80 to 98% by weight of a polycarbonate obtained from diphenols, having a mean weight-average molecular weight M.sub.w from about 10,000 to 200,000 and from about 20 to 2% by weight of a polyester-carbonate and/or polyether-carbonate with mean weight-average molecular weights M.sub.w of from about 50,000 to 300,000, which contain between about 50 and 70% by weight of soft polyester segments or soft polyether segments with mean number-average molecular weights M.sub.n of from about 10,000 to 20,000. The instant invention also relates to a process for the production of said thermoplastic molding compositions. These thermoplastic molding compositions show markedly improved resilience properties compared with known polycarbonates and can be employed as films and shaped articles in all cases where, on the one hand, high notched impact strength at low temperatures, high toughness properties at relatively high wall thicknesses, and transparency are required.

Polycarbonate molding compositions with improved resilience properties

The present invention relates to high-molecular weight aromatic polycarbonates, based on diphenols and monofunctional chain stoppers, corresponding to the formula (I) ##STR1## in which Z denotes the radical of a diphenol,

Polycarbonates with end groups containing bonds which can be crosslinked

High molecular weight aromatic polycarbonates having molecular weights M.sub.w (weight average) of between about 10,000 and 200,000, which are based on diphenols and monofunctional chain stoppers, which correspond to the general formula ##STR1## in which Z denotes the radical of a diphenol,

Polycarbonates with end groups containing double bonds which can be

The present invention relates to a process for the modification of thermoplastic aromatic polycarbonates containing aromatically bonded halogen, primary alkyl, secondary alkyl and/or alkenyl substituents, characterized in that these polycarbonates are irradiated with UV light, after adding between about 1 and 5% by weight, preferably between about 1 and 3% by weight, relative to the weight of polycarbonate, of photoinitiators and optionally between about 0.05 and 5% by weight, preferably between about 0.1 and 2% by weight, relative to the weight of polycarbonate, of flame-proofing agents. The present invention also relates to the modified polycarbonates obtainable by the process according to the invention.

Modified polycarbonates and a process for their preparation

ABS moulding compositions containing 0.1 to 10% by weight of at least one ester of an aliphatic saturated C.sub.10 to C.sub.22 -monocarboxylic acid and an aliphatic or aromatic hydroxy compound having 1 to 6 hydroxyl groups as a processing auxiliary.

Thermoplastic ABS moulding compositions with improved impact strength

The invention relates to a thermoplastic moulding composition comprising a high molecular, thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound and containing 0,01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C. atoms per molecule and an aromatic hydroxy compound with from 1 to 6 OH groups.

Thermoplastic polycarbonate moulding compositions with improved ease of

The present invention is concerned with thermoplastic molding materials of high molecular weight, thermoplastic, aromatic polycarbonates based on aromatic dihydroxy compounds and containing from about 0.01 to 0.1% by weight of esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and 4-hydric to 6-hydric alcohols.

Thermoplastic polycarbonate molding materials with improved mold release

The invention relates to a thermoplastic moulding composition comprising a thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound and containing 0.01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C atoms per molecule and an aromatic hydroxy compound with from 1 to 6 hydroxyl groups.

The present invention relates to glass fiber reinforced thermoplastic polycarbonate molding compositions whose toughness and elastic properties have been improved by the incorporation of 1 to 5 wt.% of poly-(2,6-dialkyl-1,4-phenyleneoxide). These compositions contain between 10 and 30 wt.% glass fibers and display improved properties even after extended times at high humidity. The polyphenylene oxides preferably have M.sub.w between 2,000 and 100,000, most preferably 20,000 and 60,000. A particularly suitable additive is poly-(2,6-dimethyl-1,4-phenylene oxide).

Glass fiber-reinforced thermoplastic polycarbonate molding compositions

This invention relates to thermoplastic polycarbonate molding materials having improved flame resistance and hydrolysis resistance. These materials comprise intimate blends of aromatic high molecular weight polycarbonates and about 0.5 to 50 wt. % of polyphenylene sulphides. This invention also relates to a process for improving the flame resistance and hydrolysis resistance of aromatic polycarbonates by intimately blending them with about 0.5 to 50 wt. % polyphenylene sulphide.

Polycarbonate molding materials

The invention relates to thermoplastic molding materials, of high heat distortion point, comprising polyvinyl chloride or copolymers of vinyl chloride with other vinyl compounds, and polyphenylene oxides. The molding materials according to the invention comprises a blend consisting of

Molding materials based on polyvinyl chloride and polyphenylene oxide

The present invention is concerned with a process for molding thermoplastic, high molecular weight aromatic polycarbonates the improvement which comprises adding to the aromatic polycarbonate from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides, cyclimmonium salts of perfluoroalkanesulphonic acids and ammonium salts of perfluoroalkanesulphonic acids.

Process for molding aromatic polycarbonates having

The present invention is concerned with molding compositions which contain an aromatic polycarbonate and from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides and cyclimmonium salts of perfluoroalkanesulphonic acids.

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Krefeld, Germany

Siegfried Adelmann