Basf Aktiengesellschaft

Basf Aktiwngesellschaft

Juergen Hofmann

Rainer Moors

Ehrenfried Baumgartner

Rudolf H Jung

Hansjoerg Schaech

Andreas Deckers

Volker Warzelhan

Walter Heckmann

Anton Hesse

Siegmund Besecke

Hilmar Ohlig

Rainer Bueschl

Harald Kroeger

Polymers essentially comprising units of the formula I ##STR1## in which R.sup.1 and R.sup.2 are hydrogen or methyl and

Imidation of polymers based on esters of methacrylic acid and acrylic

Rubber-modified, impact-resistant molding materials contain, based on the sum of A, B1 and B2,

ABS molding materials having a bimodal rubber particle size distribution

A process for the continuous preparation of high-impact polystyrene-acrylonitrile (ABS) by free radical-initiated polymerization of a mixture of from 60 to 90% by weight of at least one vinylaromatic monomer and from 10 to 40% by weight of least one further ethylenically unsaturated monomer, in the presence of from 5 to 30% by weight, based on the sum of the monomers, of polybutadiene having a solution viscosity (5% strength by weight in styrene at 25.degree. C.) from 25 to 95 mPa.s and in the presence or absence of a solvent, in at least three consecutive reactors operated essentially without back-mixing, at from 50.degree. to 170.degree. C., phase inversion taking place in one of the reactors, involves carrying out the polymerization as far as phase inversion at 90.degree. C. or below and initiating the polymerization by free radicals from the decomposition of tert-butyl peresters whose half life period at 90.degree. C. is not more than 20 minutes, the polybutadiene content, based on the total reaction mixture, being at least 10% by weight and at most 25% of the total amount of chain-transfer agent (regulator) required being added up to the time of phase inversion and the remainder being added thereafter.

Preparation of ABS molding materials

A curable molding material based on a dispersion of a finely divided ethylene polymer in an unsaturated polyester resin is prepared by a process in which a melt of the ethylene polymer is uniformly distributed in a melt of an unsaturated polyester in an extruder or stirred kettle.

Preparation of a curable molding material

A rubber-modified, impactresistant acrylonitrile-butadiene-styrene (ABS) molding material, as obtained by polymerizing styrene and acrylonitrile in the presence of a preformed rubber, dissolved in monomeric styrene and acrylonitrile and, if necessary, a solvent, wherein the rubber is a styrene-butadiene block copolymer and at least one further polymer which is compatible with the styrene-butadiene block rubber or its polystyrene component and is incompatible with polystyrene-acrylonitrile.

ABS molding materials

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Ludwigshafen, Germany

Juergen Hofmann