Huls Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Wilfried Ribbing

Martin Bartmann

Hans Jadamus

Roland Feinauer

Klaus Burzin

Hanns-Jorg Bax

Srinivasan Sridhar

Wolfgang Neugebauer

Christian Gerth

Michael Droscher

Wolfgang Schafer

Wolfgang Schaefer

Hans-Eberhard Von Portatius

A process for the preparation of PPE and/or PPE-containing moulding materials. Styrene or a styrene derivative is added to the organic PPE solution in order to improve the color quality.

Process for improving the quality of PPE-containing moulding materials

The invention relates to thermoplastic compositions made up of:

Thermoplastic compositions based on polyphenylene ethers and

A process for the production of polyphenylene ethers with reduced inherent color by the addition of a boron compound after the termination of the oxidative coupling reaction and removal of the metallic catalyst residues.

Process for the production of polyphenylene ethers with reduced inherent

A process for improving the color quality of PPE or molding compounds containing PPE, comprising adding an .alpha.,.beta.-unsaturated ester of the formula: ##STR1## to the organic PPE solution prior to heating it to temperatures above 150.degree. C. R.sub.a and R.sub.b are independently H, CH.sub.3, COOR.sub.c, or Ph, and R.sub.c is a C.sub.1-10 alkyl group.

Process for improving the color quality of polyphenylene oxide with

The invention relates to a method for the manufacture of molding materials containing polyphenylene ether (PPE) and to the materials obtained according to this method. Molten PPE containing at least 0.1% volatile components is degasified until it reaches a residual content of volatile components of less than 500 ppm. Subsequently, additional molten polymers and/or additives are added to this molten mass at the lowest possible temperature and both components are mixed.

Method for the manufacture of a thermoplastic molding material

The invention relates to the method of manufacturing polyphenylene ethers by an oxidative coupling reaction of monomeric phenols in a solvent mixture comprised of an aromatic hydrocarbon with 6-8 carbon atoms and an aliphatic alcohol with 1-4 carbon atoms in a volumetric ratio of the hydrocarbon to the alcohol of 92.5:7.5 to 50:50, in the presence of a catalyst comprised of cupric chloride, a secondary diamine, and morpholine.

Method of manufacturing polyphenylene ethers

A thermoplastic resin composition, which comprises (a) from 5 to 85 parts by weight of a melted or remelted preliminary molding compound consisting of from 60 to 98 parts by weight of polyphenylene ethers, 40 to 2 parts by weight of polyoctylenes, from 0.1 to 5 parts by weight of maleic anhydride and from 0.1 to 5 parts by weight of a further acid derivative which has a melting point below 100.degree. C. and which is selected from the group consisting of an unsaturated mono- or dicarboxylic acid having up to 14 carbon atoms, an anhydride thereof, which excludes maleic anhydride, and an ester of mono- or dicarboxylic acid with an alcohol of up to 6 carbon atoms; and (b) from 95 to 15 parts by weight of an aliphatic homopolyamide or a copolyamide containing a preponderant amount of aliphatic monomer units.

Impact-resistant thermoplastic molding compounds based on polyphenylene

The invention relates to a process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of di-ortho-substituted phenols, where in said process the reaction mixture is subjected to a 'reaction-extraction' (i.e., an extraction which is accompanied by reaction) with water or stream, at a temperature of 60.degree. to 150.degree. C. It is particularly advantageous if the starting mixture in the inventive process comprises a solution of the polyphenylene oxide wherein the reaction has been interrupted by water and CO.sub.2, which solution is mixed into a toluene/water mixture; and further if the 'reaction-extraction' is carried out in the presence of an alkanolamine and a stabilizer.

Process for purifying polyphenylene oxides obtained by interruption of

The invention relates to thermoplastic compositions comprising mixtures of

Thermoplastic compositions comprised of the following components:

Thermoplastic compositions based on polyphenylene ethers, styrene

A process for the production of polyphenylene oxides by the oxidative coupling of a diorthosubstituted phenol of the formula: ##STR1## wherein R and R' are an n-alkyl radical with 1 to about 6 carbon atoms or a phenyl radical in the presence of an oxidizing gas and an activated copper(II)-amine catalyst made of copper(II) salts, secondary aliphatic or cyclic amines having about 4 to 10 carbon atoms, and hydrobromides of the same or different secondary aliphatic or cyclic amines having about 4 to 10 carbon atoms, in a solvent mixture of a C.sub.6 -C.sub.8 aromatic hydrocarbon and a C.sub.1 -C.sub.4 aliphatic alcohol.

Process for the production of polyphenylene oxides

A method for producing high molecular-weight polyphenylene oxides which comprises the oxidative coupling of a diortho-substituted phenol in the presence of a copper-amine complex, and an activator of a polyvalent alcohol, an alkali or alkaline earth hydroxide, and, if necessary, the hydrobromide of a secondary amine.

Method of producing high-molecular weight polyphenylene oxides

A high molecular-weight polyphenylene oxide is produced by the oxidative coupling of a diortho-substituted phenol in the presence of a copper amine complex and an activator of morpholinium bromide and an alkali metal hydroxide or alkaline earth hydroxide.

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Dorsten, Germany

Wilfried Ribbing