Abstract: 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.

Abstract: 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.

Abstract: The present invention relates to an apparatus for the simultaneous analysis of at least two samples by the field-flow fractionation method, where the apparatus has at least the following elements: a) a source of a defined liquid stream, preferably a pump, b) at least two separation channels, each with at least one inlet and each with at least one outlet for passing the at least two samples through in each case one of the at least two separation channels, c) at least one controllable unit which is connected to the at least two separation channels via their at least one outlet each, and which can pass on the at least two samples, which can be passed through in each case one of the at least two separation channels, separately from one another to at least one unit downstream of the controllable unit.

Abstract: 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.

Abstract: 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 containsa) from 3 to 70% by weight of an alcohol or ketone having a boiling point of from 56.degree. to 100.degree. C.,b) from 0 to 50% by weight of carbon dioxide,c) from 0 to 88% by weight of a saturated C.sub.3 - to C.sub.5 -hydrocarbon,d) from 2 to 90% by weight of at least one fluorinated hydrocarbon which has a boiling point of from -30 .degree. to +30.degree. C.

Abstract: A thermoplastic molding material contains, based on the sum of A and B,A: from 75 to 97% by weight of a polystyrene A as a hard matrix andB: from 3 to 25% by weight of a particulate, elastomeric (co)polymer B based essentially on butadiene or its copolymers, in turn consisting of, based on B,B1: from 40 to 98% by weight of a (co)polymer B1 having a mean particle size of from 100 to 600 nm andB2: from 2 to 60% by weight of a particle blend B2 which in turn consists of, based on B2,B21: from 1 to 60% by weight of a (co)polymer B21 having a particle size of from 200 to 1,200 nm andB22: from 40 to 99% by weight of a (co)polymer B22 having a mean particle size of from 1,200 to 8,000 nm,(co)polymer B1 having an encapsulated-particle morphology and (co)polymers B21 and B22 having a cellular and/or coiled particle morphology.

Abstract: 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 containinga) from 3 to 70% by weight of an alcohol or ketone having a boiling point of from 56.degree. to 100.degree. C.,b) from 5 to 50% by weight of carbon dioxide andc) from 0 to 90% by weight of a saturated C.sub.3 - to C.sub.5 -hydrocarbon and/or of a hydrogen-containing chlorofluorocarbon or fluorinated hydrocarbon boiling at from -30.degree. to +30.degree. C.

Abstract: 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.

Abstract: 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.