Basf Aktiengesellschaft

Other

Horst Schuch

Manfred Weilbacher

Wolfgang Schrof

Reinhold Weber

Gerhard Alicke

Heinz Voelker

Klaus Bronstert

Peter Bauer

Daniel Wagner

Klemens Mathauer

Peter Klaerner

Claudia Wood

Son Nguyen-Kim

Rainer Konrad

Gerhard Wegner

Herbert Morgenstern

Wolfgang Meyer

Peter Hossel

Uwe Blumenstein

Hans-Michael Walter

Walter M&auml;chtle

Thomas Kaiser

Timo Rager

The present invention relates to an ampholytic copolymer, to polyelectrolyte complexes which comprise such an ampholytic copolymer, and to cosmetic or pharmaceutical compositions which comprise at least one ampholytic copolymer or one polyelectrolyte complex.

Ampholytic copolymer and use thereof

Process and apparatus for the parallel analysis of colloidal particles using field-flow fractionation

In a process for the preparation of an aqueous polymer dispersion by the free radical aqueous emulsion polymerization method, the polymerization is carried out in the presence of frozen micelles of amphiphilic substances.

Preparation of an aqueous polymer dispersion by the free radical aqueous emulsion polymerization method

Foam boards of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent which contains

Production of foam boards of high compressive strength using a blowing

A thermoplastic molding material contains, based on the sum of A and B,

Thermoplatic molding materials

Foam sheets of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent mixture containing

Production of foam sheets of high compressive strength

For the production of extrudates of ultra-high molecular weight polyethylene, finely divided polyethylene or polyethylene powder is introduced into the cooled feed zone of a single-screw extruder and compressed therein, melted in a transport zone of the extruder and discharge with shaping of the extrudate and cooling. The polyethylene is processed in the transport zone using a velocity gradient of from 50 to 1,000 sec.sup.-1 in the radial play between the screw and the extruder barrel, heated to 180.degree.-280.degree. C. and then transferred to a screw-free zone in which final shaping of the extrudate is effected.

Production of hardwearing and shock-resistant extrudates of ultra-high

In block copolymers of the general formula A--B--A' which have a molecular weight of less than 300,000 and consist of from 18 to 40% by weight of a vinylaromatic hydrocarbon and from 60 to 82% by weight of one or more partially or completely hydrogenated hydrocarbons and in which A and A' are each a polymer block of a vinylaromatic hydrocarbon and B is a polymer block of a diene hydrocarbon, the weight ratio of the polymer blocks A to A' is less than or equal to 1:5 and greater than 1:10 and the mean molecular weight of polymer block A is from 2,000 to 20,000 and that of the polymer block A' is from 10,000 to 110,000 and the molecular weight of the B block is not less than 18,000. The block copolymers are prepared by a process in which, in a first polymerization stage, the vinylaromatic hydrocarbon is completely polymerized to form the A or A' block, in the second polymerization stage the diene hydrocarbon is completely converted to form the B block and thereafter the second portion of the vinylaromatic hydrocarbon is polymerized on to form the A or A' block, the portion of a vinylaromatic compound for the preparation of the A' block being not less than five times, and not more than 10 times, the weight used to form the A block. The block copolymers are used for the preparation of molding materials.

Butadiene/sytrene block copolymers having an asymmetric structure, their

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Ilvesheim, Germany

Horst Schuch