Bayer Aktiengesellschaft

Udo Rudolph

Dieter Freitag

Claus H Wulff

Manfred Schmidt

Norbert Bachem

Ludwig Bottenbruch

Werner Nouvertne

Horst Peters

Volker Serini

Josef Buekers

Hermann Kauth

Frank Gerald Kleiner

Jurgen Hinz

This invention relates to a catalyst modified with mercapto amines, its preparation and its use for the preparation of bisphenols.

Ion exchangers modified with mercapto amines

Ion exchange modified with mercapto amines

This invention relates to a process for the preparation of bisphenols and bisphenol mixtures by the isomerization of bisphenols on acid or alkaline catalysts in the presence of the corresponding phenols.

Isomerization of bisphenols

This invention relates to an ionic exchanger modified with thiazolines, to its preparation and to its use for the preparation of condensation products, particularly bisphenols.

Ionic exchangers modified with thiazolines

The invention relates to a process for the preparation of polyphosphonic acid amides by condensation of 0.5-2 moles of a phosphonic acid diaryl ester and 1 mole of an aliphatic, aromatic, araliphatic or heterocyclic primary or secondary diamine in the melt at 50.degree.-350.degree. C., if appropriate in the presence of a catalyst which accelerates the condensation and under an inert gas atmosphere, the corresponding phenol being split off.

Process for the preparation of polyphosphonic acid amides

This invention relates to flame-resistant polymer mixtures of polycarbonate, styrene polymer and/or graft polymer and polyphosphate, which mixtures may contain organic chlorine and bromine compounds and polytetrafluoroethylene used for the production of moulded articles such as electrical housings, electrical insulators, and for moulded automobile parts such as coverings, dashboards and so forth.

Flame-resistant polymer mixtures

A single-stage process for the production of pure, particularly sulphur-free, aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid containing from 1 to 3 carboxyl groups or a corresponding mixture of aromatic carboxylic acids with thionyl chloride in the presence of a catalyst, wherein tertiary phosphine oxides or their reaction products with thionyl chloride and/or the acid chloride to be formed are used as catalysts, and the use of the aromatic dicarboxylic acid dichlorides and tricarboxylic acid trichlorides obtained for the production of polycondensates.

Process for the production of aromatic carboxylic acid chlorides

A single-stage process for the production of pure aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid or an aromatic carboxylic acid mixture with thionylchloride in the presence of tert. phosphine as the catalyst.

Growing community of inventors

Krefeld, Germany

Udo Rudolph