Bayer Aktiengesellschaft

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Karsten J Idel

Dieter Freitag

Edgar Ostlinning

Ludwig Bottenbruch

Hugo Vernaleken

Volker Serini

Josef Merten

Wolfgang Cohnen

Gunther Reiff

Wolfgang Ebert

Ulrich R Grigo

Hans Rudolph

Dieter Margotte

Hans-Josef Buysch

Rolf-Volker Meyer

Klaus Reinking

Horst Peters

Uwe Westeppe

Wolfgang Alewelt

Friedemann Muller

Walter Heitz

Volker Eckhardt

Wolfgang Koch

Carl Casser

Manfred Hajek

Frank Gerald Kleiner

Joachim Genz

Klaus-Christian Paetz

Otto Neuner

Heinz-Josef Fullmann

Thomas Joswig

Manfred Schmidt

Werner Nouvertne

Rudiger Schubart

Ottfried Schlak

Josef Buekers

Gerd Fengler

Ralf Pakull

Frank Druschke

Harald Medem

Bernd Willenberg

Wolfgang M Eisermann

Hans-Rytger Kricheldorf

Sabine Kern

Volker Doring

The invention relates to a process for the preparation of optionally branched, high molecular weight polyarylene sulphides with melt viscosities which can be established at defined values and low corrosion. These polyarylene sulphides are obtained by reacting alkali metal sulphides, if appropriate mixed with alkali metal bisulphides and reaction accelerators, with dihalogenoaromatics and, if appropriate, polyhalogenoaromatics, with the addition of particular monohalogenoaromatics as chain stoppers.

Process for preparation of high molecular weight, optionally branched

The invention relates to an anhydrous process for the preparation of high molecular weight, optionally branched polyarylene sulphides. These can be prepared in a polar organic solvent in the absence of water by reaction of dihalogenoaromatics with sodium sulphides and bisulphide or potassium sulphides and bisulphide in the presence of catalysts in a polar organic solvent.

Process for the preparation of high molecular weight, optionally

The present invention relates to a process for the production of high molecular weight crystalline aromatic polyether ketones from an aromatic dihydroxy compound and an aromatic dihalogeno compound which contains a keto group, characterized in that N-C1-C5 alkyl caprolactam solvents and a mixture of alkali metal compounds consisting of at least one alkali metal carbonate and at least one compound selected from alkali metal hydroxides, bicarbonates, fluorides, hydrides, alkoxides (e.g. methylates or ethylates) and alkylates (e.g. ethyls or butyls) are used.

Process for the production of aromatic polyether ketones

Thermoplastic blends containing polycarbonates based on substituted

Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical, halogen and

Polycarbonate of alkyl cyclohexylidene bisphenol

Thermoplastic aromatic polycarbonates having average molecular weight Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 -hydrocarbon, halogen,

Polycarbonate of cycloalkylidene bisphenol

The thermotropic aromatic polyesters according to the invention which contain recurring units corresponding to the following formulae ##STR1## show improved resistance to chemicals, low melting points and, hence, good processibility in addition to the well-known favorable mechanical properties of liquid-crystal materials. The thermotropic aromatic polyesters are used for the production of moldings, filaments, fibers and films.

Thermotropic aromatic polyesters, a process for their production and

The invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulfides from alkali sulfides and aromatic dihalogen compounds, in which the reaction is carried out in a polar solvent, such as an N-alkyl lactam, containing from 0.5 to 100 mole %, based on the moles of aromatic dihalogen compound, of a lactam.

Process for the production of high molecular weight, optionally branched

Flame-resistant, thermoplastic polyamide moulding materials which contain 0.01-4% by weight of polyphenylene oxides as flameproofing agent and which are prepared by mixing the components in the melt.

Flame-resistant polyamides

This invention relates to a process for the preparation of optionally branched polyarylene sulphides which are distinguished by their substantially lower corrosiveness.

Process for the preparation of optionally branched polyarylene sulphides

Flameproof thermoplastic polyamide moulding materials which contain 2 to 20% by weight, based on the polyamide, of at least one non-halogenated cyclic aromatic inside compound.

Flameproof polyamides

The invention relates to a process for the preparation of high-molecular, optionally branched polyarylene sulphides. These can be prepared without a catalyst in a polar organic solvent by reacting dihalogenoaromatic compounds with mixtures of sodium and potassium sulphides and hydrogensulphides.

Process for the preparation of high-molecular, optionally branched

The invention relates to a process for the preparation of high molecular weight, optionally branched polyarylene sulphides with melt viscosities which can be adjusted within a defined range, a high stability of the melt and low corrosion. These polyarylene sulphides are obtained by reacting alkali metal sulphides, if appropriate mixed with alkali metal bisulphides and reaction accelerators, with dihalogenoaromatics and, if appropriate, polyhalogenoaromatics, with the addition of particular monomercapto compounds.

The invention relates to a process for the preparation of optionally branched, high molecular weight polyarylene sulphides with melt viscosities which can be established within a defined range and low corrosion. These polyarylene sulphides have been obtained by reacting alkali metal sulphides, if appropriate mixed with alkali metal bisulphides and reaction accelerators, with dihalogenoaromatics and polyhalogenoaromatics, with the addition of monohalogen and monomercapto compounds.

Process for the preparation of polyarylene sulphide with monohalogeno

This invention relates to optionally branched polyarylene sulphides and a process for the production thereof in a polar solvent, from 0.2 to 100 mole %, based on the aromatic dihalogen compounds, of an amino acid being added to the reaction mixture.

Polyarylene sulphide having high melt viscosity

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Krefeld, Germany

Karsten J Idel