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Basf Se (Ellwanger & Baier Patentanwälte)

Eckhard Neufeld

Jan Holoch

Klaus Hahn

Andreas Deckers

Konrad Knoll

Gunnar Schornick

Dietrich Scherzer

Roland Minges

Thomas Heitz

Siegmund Besecke

Franz-Josef Dietzen

Jurgen Hofmann

Klaus-Dieter Hungenberg

Bernhard Schmied

Ingo Bellin

Hermann Fischer

Thomas Anstock

Wolfram Husemann

Olaf Kriha

Birgit Reinhard

Michel Pepers

Pascal Hesse

Jun Gao

Tim Diehlmann

Peter Merkel

Michael Gehde

Renata Jovanovic

Wolfgang Kasten

Carsten Sandner

Barbel Arnold-Mauer

Petra Wieland

Christoph Sachsenweger

Hans-J Urgen Krauss

J Urgen Tropsch

Hans-Joachim H Ahnle

Wolfgang Ferstl

Rudolf Süttinger

Ping Zhang

Herbert Schall

Andreas DAIß

Brominated vinylaromatic-diene block copolymers (Br-SBC) comprising a vinylaromatic polymer block S and a brominated diene polymer block BB, wherein before bromination the weight-average molar mass Mof the block S is greater than or equal to Mof the block BB, use thereof as flame retardants, and also polymer compositions comprising these for unfoamed and foamed thermoplastic polymers, for example EPS and XPS.

Brominated flame retardant

The invention relates to a process for the production of at least two-layer thermoplastic sheets via thermal welding of at least one thinner thermoplastic sheet with density (D1) and of at least one second thinner thermoplastic sheet with density (D2), where the density (D1) of the first thinner thermoplastic sheet is smaller than the density (D2) of the second thinner thermoplastic sheet. The process introduces at least one first heating element and at least one second heating element along mutually offset planes between the two thinner thermoplastic sheets, where the surfaces of the thinner thermoplastic sheets do not touch the surfaces of the heating elements. The first heating element transfers a quantity of energy (E1) to the surface of the first thinner thermoplastic sheet, and the second heating element transfers a quantity of energy (E2) to the surface of the second thinner thermoplastic sheet, where the quantity of energy (E1) is smaller than the quantity of energy (E2).

Method for producing multi-layered thermoplastic plates by means of thermal welding of different plates

The invention provides a process for preparing expandable styrene polymers which comprises the steps of:

Preparing expandable styrene polymers

Process for the preparing high molecular weight polymers by polymerization of water-soluble, monoethylenically unsaturated moonomers and, if desired, crosslinkers, and, if desired, water-insoluble monoethylenically unsaturated monomers, in aqueous solution in the presence of polymerization initiators in a tubular reaction which at the end has a conical taper, the ratio of the diameter of the reactor (D1) to the diameter at the end of the conical taper of the reactor (D2) being from 2:1 to 25:1 and the angle between D1 at the beginning of the conical taper and the inner cone wall being &gt;45.degree. and &lt;90.degree., and discharge of the gelatinous reaction mixture from the reactor by injection of an inert gas.

Preparation of high molecular weight polymers

For the preparation of polyarylene ether ketones by Friedel-Crafts polycondensation, a reaction mixture consisting of

Preparation of polyarylene ether ketones

Abstract of the Disclosure: Particles of poly(meth)acrylimides obtainable by reacting a polymer based on C.sub.1 -C.sub.22 -alkyl esters of acrylic and/or methacrylic acid with ammonia and/or at least one primary amine RNH.sub.2 are produced by

Production of particulate poly(meth)acrylimides

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Limburgerhof, Germany

Eckhard Neufeld