Bayer Aktiengesellschaft

Ineos Abs Limited

Hans-Bernhard Hauertmann

Herbert Eichenauer

Dieter Wittmann

Heinrich Alberts

Alfred Eitel

Dorothy Rose

Thomas Eckel

Eckhard Wenz

Michael Zobel

Ulrich Jansen

Karl Zabrocki

Bernd Keller

Hans-Erich Gasche

Stefan Moss

Michael König

Liqing-Lee Sun

Homo- and/or copolymers of one or more ethylenically unsaturated monomers, suitable for the preparation of molded articles that feature improved properties, especially improved fracture properties, heat stability and notched impact strength are disclosed. These homo- and/or copolymers are characterized in that they contain less than 400 particles per mof surface area with a diameter greater than 200 &#x3bc;m.

Thermoplastic molding compounds with improved surface properties and improved structural homogeneity

A molding composition having good surface gloss, high elongation at break and good thermoplastic processability is disclosed. The composition contains (A) a graft polymer that is obtained by free-radical polymerization of resin-forming vinyl monomers in the presence of rubber in latex form, (B) a copolymer of styrene and acrylonitrile and an optional (C) a resin selected from the group consisting of polycarbonates, polyester-carbonates, polyesters and polyamides. The preparation of the graft polymer is characterized in that (i) before the start of the grafting polymerization reaction the rubber latex is brought to a pH of 9 to 11, (ii) the redox initiator components are employed in amounts of 0.1 to 2.5 wt. % (based on the monomers metered in) and (iii) during the entire grafting polymerization reaction the pH remains constant&plusmn;0.5 and in the range of 11.0 to 8.8, and (iv) the temperature difference between the start and end of the reaction is at least 10&deg; C.

Thermoplastic molding materials based on special graft rubber components

The invention relates to homopolymers and/or copolymers containing <100 ppm coarse particles with a particle diameter of between 200 and 500 &mgr;m, to thermoplastic moulding materials containing said homopolymtrs and/or copolymers, to the use of the homopolymers and/or copolymers and moulding materials for the production of moulded parts and to the moulded parts themselves.

Thermoplastic resins with a low proportion of coarse particles

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Dormagen, Germany

Hans-Bernhard Hauertmann