Bayer Aktiengesellschaft

Other

Agfa Gevaert Nv

Klaus D Berg

Ulrich R Grigo

Alfred Eitel

Claus H Wulff

Hans-Josef Buysch

Georg Malamet

Wolfgang Ebert

Gerhard Fennhoff

Dieter Freitag

Ludwig Bottenbruch

Karsten-Josef Idel

Uwe Westeppe

Ralf Hufen

Ralf Pakull

Heidemarie Pantke

Bernhard Wehrle

Manfred Schmidt

Rolf-Volker Meyer

Karl-Erwin Piejko

Bernd Baasner

Helmut Waldmann

Volker Serini

Klaus Horn

Marcel J Monbaliu

Ralf Dujardin

Otto Immel

David R Terrell

Jurgen Kirsch

Leo Morbitzer

Klaus Kircher

Gunther Weymans

Helmut-Martin Meier

Richard Weider

Carl Casser

Manfred Hajek

Wolfgang Jakob

Wolfgang Wehnert

Bernd Griehsel

Tony Van Osselaer

Klaus Summermann

Franz Backes

Guther Weymans

Kurt P Meurer

J Urgen Hinz

Clauss Wulff

The present invention relates to a process for the manufacture of bis(4-hydroxyaryl)alkanes by heterogeneous acid-catalyzed reaction of aromatic hydroxy compounds with ketones in reactors connected in series, which in the direction of advancing conversion are operated with rising temperature and optionally with increasing loading.

Process for the manufacture of bis(4-hydroxyaryl)alkanes

The present invention provides polycarbonate moulding compositions containing polycarbonates, stabilisers of the general formula (I)

(Co)polycarbonates stabilized against .gamma.-radiation

(Co) polycarbonates stabilised against .gamma.-radiation

The invention relates to a process for the synthesis of bis-(4-hydroxyphenyl)-alkanes on ion-exchange resins or mixtures of ion-exchange resins which are modified with alkyl-SH groups, wherein the monophenols and carbonyl compounds to be used have first been purified to remove substances which can transfer alkyl groups.

Bisphenol synthesis on modified ion-exchange resins using specially

The present invention provides flame-resistant polycarbonate moulding compositions with a concentration of alkali metal or alkaline earth metal salts and of silicon compounds and their preparation.

Flame-resistant polycarbonate moulding-compositions

The present invention provides a process for the production of high purity bisphenol A by special in-process-crystallisation of bisphenol A/phenol adduct crystallisates.

Process for the continuous production of high purity bisphenol A

The invention relates to repeatedly regeneratable ion exchanger resins with a thin covering of alkyl-SH groups.

Process of regenerating sulfonic acid cation exchange resins with a

The invention relates to a process for increasing (improving) the volume/time yield of fixed-bed reactors in the production of bisphenol A.

Optimized ion exchanger beds for the synthesis of bisphenol A

The invention relates to a process for the production of bisphenols from acetone and phenols in the presence of sulfonic acid ion exchanger resins modified with alkyl-SH groups, in which 0.6 to 5% by weight H.sub.2 O is added to the mixture of phenol and acetone before the reaction.

Process for the production of bisphenols

A process for the purification of bisphenols by distillation.

Process for the purification of bisphenols

This invention relates to a process for the preparation of substituted cycloalkylidene bisphenols from phenols and special cycloalkanones in the presence of acid condensation catalysts and in the presence of water.

Process for the preparation of substituted cycloalkylidene bisphenols

The invention relates to the use of the diphenol corresponding to formula (I) ##STR1## for the production of high molecular weight, thermoplastic, aromataic polycarbonates, to a process for the production of these polycarbonates and to the new thermoplastic having improved heat resistance obtainable by the process.

Polycarbonate from bi(tetrahydrofuran)di phenol

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

This invention relates to halogen-free binary mixtures of two fully aromatic polycarbonates each having a disperse solubility of from 18 to 35 (J/ccm).sup.1/2, in which both polycarbonates are of high molecular weight and each contains not more than 70 mol-% of bisphenol A. The invention further relates to the use of these mixtures for optical data stores and to moulded parts produced from the mixtures.

Moulding compounds of polycarbonate mixtures having a high disperse

The invention relates to the use of thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether in quantities of 3% by weight to 30% by weight for modifying filsm of other thermoplastics than the thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether, to a process for modifying films of these other thermoplastics, to the films obtainable by this process and to mixtures containing the homopolycarbonates mentioned and the other thermoplastics.

Use of homopolycarbonates of 3,3'-dihydroxydiphenyl ether for modifying

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Krefeld, Germany

Klaus D Berg