Basf Aktiengesellschaft

Basf Se Corporation

Styrolution Gmbh

Styrolution Europe Gmbh

Bernhard Czauderna

Norbert G&uuml;ntherberg

Hilmar Ohlig

Norbert Niessner

Christian Schade

Klaus Bus

Peter Ittemann

Graham E McKee

Gerhard Olbert

Sven Grabowski

Hartmut Heinen

Klaus Muehlbach

Kaspar Bott

Marco Krüger

Norbert Guntherberg

Jurgen Hofmann

Elmar Mailahn

Michael Breulmann

Karl Hennig

Carola Hedtmann-Rein

J&uuml;rgen Koch

Wil Duijzings

Sabine Oepen

Graham Edmund Mc Kee

Anton Hesse

Dietmar Nissen

Klaus-Dieter Hungenberg

Gerd Ehrmann

Karl-Heinz Wassmer

Martin Welz

Norbert Güntherberg

Roland Peter

Joachim Seibring

Andreas Kleinke

Peter Barghoorn

J&uuml;rgen Hofmann

Doris Zeltner

Juergen Nieberle

Tsung-Chieh Cheng

Rainer Nachtrab

Jens-Uwe Schierholz

Andreas Einwiller

Norbert Mosbach

Jürgen Hofmann

Hellmut Buensch

Paulus Schmaus

Marian Mours

Harmut Heinen

Alexander Ludwig

Martina Von Deessen

Michael Sauer

Heike Feldman

Peter Steieri

Karl-Heinz Stoffel

Rainer Bardon

A polybutadiene latex is prepared by a process in which butadiene is polymerized by free radical emulsion polymerization in the presence of initiator and, if required, dispersants and further conventional assistants, the polymerization being carried out in the presence of reactive comonomers in such a way that the heat flow of 43 watt/kg solids content of the polymerization mixture is not exceeded. Owing to the presence of reactive comonomers, the reaction rate at the beginning of the reaction is increased, with the result that an overall flatter heat flow profile is obtained. A preferred reactive comonomer is styrene. Preferably, the process is carried out by a semi-batch procedure in which

Method for producing polybutadiene latex with an optimized thermal current profile

Thermoplastic molding materials containing the following ingredients with regard to components A-F: A) 5-70 wt. % of at least one graft copolymer A) consisting of a rubber elastic base with a glass transition temperature below 0&deg; and a grafted overlay made of a styrene compound and acrylonitrile or methacrylonitrile or mixture thereof in addition to, optionally, other monoethylenically unsaturated monomers, B) 29-90 wt. % of a hard copolymer made of at least one styrene compound, acrylonitrile or methacrylonitrile or mixtures thereof and, optionally, other monoethylenically unsaturated monomers, C) 0-5 wt. % of at least one three-block copolymer X-Y-X with a middle block Y propylenoxide units and terminal block X made of ethyleneoxide units, D) 0.01-5 wt. % of at least one butylated reaction product of cresol with dicyclopentadiene, E) 0.01-5 wt. % of at least one thiocarboxylic acid ester, F) 0.01-5 wt. % of at least one alkaline metal salt or alkaline earth metal salt of a C -C carboxylic acid, G) 0-30 wt. % in relation to constituents A)-G), of other usual additives. The moulding materials exhibit a db* -value, after exposure to the atmosphere, of less than &plus;5,0 after 100 hours of exposure to light and the atmosphere according to ISO 4892/2, method A, black temperature 65&deg; C. colour measurement according to CIE-Lab in accordance with DIN 6174 and DIN 5033.

Stabilized thermoplastic molding materials

The invention relates to a method for producing caoutchouc particles (K) by means of emulsion polymerisation in the presence of an emulsifier and a polymerisation initiator. Said particles contain A) 80 to 100 wt. % of one or more conjugated diene monomers (A) in relation to (K) and B) 0 to 20 wt. % of one or more monoethylenically unsaturated comonomers (B) in relation to (K) in the polymerised form. The inventive method is characterised in that 1) a mixture (M ) containing water and an emulsifier is provided, 2) a mixture (M ) containing one or more monomers in the monomer or polymerised form selected from styrole, &agr;-methylstyrole, butadiene, n-butylacrylate, MMA and acrylnitrile and optionally comonomers is added, 3) polymerisation of the obtained mixture starts in the presence of a polymerisation initiator at temperature of 5 to 95&deg; C., 4) a mixture (M ) containing 0 to 100 wt. % of the comonomers (B) in relation to (B) and 0 to 25 wt. % of the diene monomers (A) in relation to (A) is added, 5) a mixture (M ) containing the (remaining) diene monomers (A) and the (remaining) comonomers (B) is proportioned and polymerised and 6) polymerisation is terminated when there is conversion of more than 90 and less than 95% in relation to the sum of the monomers.

Method for producing caoutchouc particles

Shear forces are used for essentially salt-free coagulation of plastics dispersions or rubber dispersions. For this, method of use is made of an apparatus with at least one shearing module which has a stator and a rotor arranged within the stator, where the surfaces facing toward one another in the stator and in the rotor are in each case smooth, or at least the rotor exhibits a structure formed on its surface and facing from this in the direction of the stator, and between the stator and the rotor there is a gap of predetermined gap width. The process is carried out by passing the dispersion to be coagulated through the gap between stator and rotor and precipitating the dispersion by rotation of the rotor with predetermined shear rate and shear deformation.

Method for coagulating plastics dispersions using a device with shearing elements

In a process for precipitating microsuspension polymers from a suspension comprising them, a polymer dispersion prepared by emulsion polymerization is added to the suspension.

Method for precipitating microsuspension polymers

A thermoplastic molding composition having little intrinsic color is produced from a graft copolymer and a thermoplastic polymer. The graft copolymer is produced from a soft elastomeric particulate graft base obtained by polymerization of a conjugated diene alone or with a small amount of a monoethylenically unsaturated monomer, upon which is grafted a vinylaromatic monomer and acrylonitrile and optionally another monoethylenically unsaturated monomer. The thermoplastic polymer is a copolymer of a vinylaromatic monomer and acrylonitrile and optionally an additional monoethylenically unsaturated monomer. The thermoplastic molding composition has a low level of intrinsic color coupled with good mechanical properties and can be processed by, for example, extrusion, injection molding, calendaring, blow molding, compression molding, or sintering.

Low individual color thermoplastic molding material

Process for producing thermoplastics

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 50% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in a mixing unit, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating screws and essentially includes, in the transport direction,

Preparation of thermoplastics

Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 60% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in an extruder, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case double-flight, screws and essentially includes, in the transport direction,

Toughened thermoplastics are prepared by mixing a water-moist elastomer component A containing up to 60% by weight of residual water with a thermoplastic polymer B and further polymers C and additives D in an extruder with mechanical dewatering of the elastomer component A, by a process in which the components A, B, C and D are fed to a twin-screw extruder which has corotating screws and essentially comprises, in the transport direction,

Polyphenylene ethers are prepared from monohydric phenols by oxidative coupling with oxygen-containing gases in the presence of an oxidation catalyst in an organic solvent by carrying out the polycondensation in the presence of a defoamer.

Preparation of polyphenylene ethers in the presence of defoamer

A process for preparing polyphenylene ethers from monohydric phenols which have alkyl substituents in both ortho positions and possibly also in one meta position but not in the para position, by oxidative coupling with oxygen-containing gases in the presence of an oxidation catalyst and of an electrically conducting compound which counteracts the electrostatic charge in the reaction mixture, in organic solution, comprises using as electrically conducting compound a salt of a carboxamide derivative of the formula I ##STR1## or mixtures of such salts, where R.sup.1 is a saturated or singly or multiply unsaturated aliphatic group which can have a terminal phenyl group and which contains a total of 8-30 carbon atoms, it also being possible for these carbon atoms to be interrupted by isolated oxygen atoms,

Preparation of polyphenylene ethers

Vinyl ester resins possess unsaturated terminal groups and are based on polyphenols of the formula

Vinyl ester resins

A laminate consists of a layer A of a polyolefin, reinforced with from 10 to 50% of glass fiber mats, and a metal layer D, which are bonded to one another by means of a mechanically adhesion-promoting layer B and an adhesive layer C. The adhesive is a thermoplastic polyurethane elastomer, preferably having a melting range of from 110.degree. to 250.degree. C. The laminates are used as automobile components, and as housings and containers.

Laminate bonded by adhesion promoting layer and adhesive layer

A hardenable polyester molding material contains a mixture of

Hardenable polyester molding materials

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Hirschberg, Germany

Bernhard Czauderna