Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Bayer Ag Konzernverwaltung Rp

Alfred Eitel

Claus H Wulff

Klaus D Berg

Georg Malamet

Gerhard Fennhoff

Ernst Meisert

Hans-Josef Buysch

Wilhelm Goyert

Georg Niederdellmann

Hans Wagner

Dieter Wittmann

Bernd Quiring

Ralf Pakull

Tony Van Osselaer

Wolfgang Grimm

Hans-Bernhard Hauertmann

Ricarda Nothelle

Michael König

Dorothy Rose

Bernhard Wehrle

Dieter Freitag

Herbert Eichenauer

Thomas Eckel

Heinrich Alberts

Helmut Waldmann

Uwe Westeppe

Otto Immel

Jurgen Kirsch

Ulrich Liesenfelder

Michael Zobel

Heiko Herold

Rainer Neumann

Martin Ullrich

Carl Casser

Manfred Hajek

Frieder Heydenreich

Klemens Kohlgrüber

Kaspar Hallenberger

Steffen K&uuml;hling

Bernd Keller

Rolf Lanze

Hans-Jürgen Thiem

Jurgen Hinz

Hans-Peter Wirges

Rainer Bellinghausen

Werner Verhoeven

Bernd Griehsel

Helmut Meyer

Johan Vaes

Kurt-Peter Meurer

Stefan Moss

Hans Hespe

Frank Weyrich

Ignace Hooftman

Andreas Frankenau

Haakan Jonsson

Clauss Wulff

Stephen Böhmer

Peter Rudolph

Franz Backes

Kurt P Meurer

J Urgen Hinz

Willy Van Herck

A continuous process for the production of an elastomer-modified thermoplastic is disclosed. The process entails (i) obtaining graft elastomer (D) having residual moisture content of 1 to 50 wt. %, particularly 5 to 50 wt. %, particularly preferably 10 to 40 wt. %, (ii) introducing (D) and thermoplastic resin (B) through an inlet to a reactor operating under conditions calculated to melt (D) and (B) and to remove organic volatile components C) to produce a molten blend, the reactor being equipped with a plurality of kneading bars, that convey a portion of the molten blend towards the reactor inlet.

Process and device for the production of elastomer-modified thermoplastics

Rubber-free copolymers of unsaturated monomers selected from the group comprising styrenes and vinyl cyanides are disclosed. The copolymers that contain 65 to 80 wt. %, of styrene and 20 to 35 wt. % of acrylonitrile are characterized in their low content of residual monomers and improved physical properties. Also disclosed are a process and a device for the preparation of these copolymers.

Copolymers, devoid of rubber, with low residual monomer content and a method and device for producing the same

Homo- and/or copolymers of one or more ethylenically unsaturated monomers, suitable for the preparation of molded articles that feature improved properties, especially improved fracture properties, heat stability and notched impact strength are disclosed. These homo- and/or copolymers are characterized in that they contain less than 400 particles per mof surface area with a diameter greater than 200 &#x3bc;m.

Thermoplastic molding compounds with improved surface properties and improved structural homogeneity

The invention relates to homopolymers and/or copolymers containing <100 ppm coarse particles with a particle diameter of between 200 and 500 &mgr;m, to thermoplastic moulding materials containing said homopolymtrs and/or copolymers, to the use of the homopolymers and/or copolymers and moulding materials for the production of moulded parts and to the moulded parts themselves.

Thermoplastic resins with a low proportion of coarse particles

A method for producing bisphenol A in prill form is disclosed. Molten bisphenol is top-fed into a prilling tower via a plate containing a plurality of nozzles. A gas coolant guided through a circuit is led into said tower in a counter flow direction. The prills are cooled to about room temperature, collected at the bottom of the tower and removed. Also disclosed is the device for carrying out the inventive method and the prills thus produced.

Method and device for producing bisphenol a prills and bisphenol a prills produced according to this method

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

A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.

Process for the purification of bisphenol

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 invention relates to the synthesis of bisphenols from monophenols and carbonyl compounds such as aldehydes and ketones with concentrated mineral acids such as hydrochloric acid and/or hydrogen chloride gas as acid catalysts and a mercaptan as cocatalyst, which is fixed by an ion-pair bond to a matrix insoluble in the reaction medium.

Process for the production of bisphenols with the use of new cocatalysts

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

The invention relates to a special process for the production of high-purity bisphenol A from acetone and phenol in the presence of acidic catalysts.

Process for the production of high-purity bisphenol A

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

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Dormagen, Germany

Alfred Eitel