Bayer Aktiengesellschaft

Harald Medem

Dieter Freitag

Klaus Reinking

Rolf Dhein

Ludwig Bottenbruch

Werner Nouvertne

Manfred Schreckenberg

Manfred Schmidt

Helmut Waldmann

Hans Rudolph

Karsten J Idel

Peter R Muller

Udo Birkenstock

Carl Heynemann

Herbert Schmidt

Zoltan Kricsfalussy

Burkhard Lachmann

Gunter Stammann

Harry Rohr

Hans Hespe

Joachim Schneider

Supported catalysts containing palladium on a support material are improved by added bases which remain on the material. These supported catalysts are useful for hydrogenating optionally substituted phenols to give the corresponding cyclohexanols as the predominant product.

Supported hydrogenation catalysts

Catalysts for the gas-phase reduction of aromatic nitro compounds to aromatic amines are regenerated by treatment of the catalyst, at elevated temperature, with a gas mixture which contains oxygen, inorganic and/or organic amines and/or nitrogen oxides and, where appropiate, steam.

Process for the regeneration of catalysts for the gas-phase reduction of

The present invention relates to high molecular weight thermoplastic hexahydro-furo-(3,2-b)-furane-3,6-diol based copolycarbonates useful as molding resins and to a method for their preparation.

Thermoplastic polycarbonates, their preparation and their use as shaped

The present invention relates to mixtures of polycarbonates containing hydrogenated dimeric fatty acid esters as condensed units, and polyolefines and, if appropriate, other high-molecular weight, aromatic thermoplastic polycarbonates.

Mixtures of polycarbonate elastomers, containing hydrogenated dimeric

Aromatic polyesters based on diphenols, terephthalic and isophthalic acid and particular chain terminators exhibit an improved color number, an improved flowability and increased dimensional heat stability with otherwise comparable mechanical characteristics.

Process for the preparation of aromatic polyesters and the use thereof

Polyester phosphonates based on aromatic dicarboxylic acids and aromatic dihydroxy compounds exhibit a low flammability and surprisingly improved mechanical characteristics, particularly an excellent dimensional heat stability.

Aromatic polyester phosphonates

High-molecular polyesters which are distinguished by good processability, a high glass transition temperature, mechanical strength and clear transparency are reproducibly obtained by transesterifying and polycondensing bisphenols with diaryl terephthalates and/or diaryl isophthalates in the presence of an aromatic polycarbonate having a molecular weight of 600 to 15,000.

Process for the preparation of aromatic polyesters

Thermoplastic aromatic polyesters comprising cocondensed bisphenol residues generally have a refractive index n.sub.d of from 1.60 to 1.66, an Abbe coefficient v.sub.d of from 27 to 21 and a color triplet of about 5.1, 0.1, O and are excellent starting materials for the production of optical components, particularly high quality lenses for still and cine cameras.

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Krefeld, Germany

Harald Medem