Basf Aktiengesellschaft

Basf Se Corporation

Michael Kerber

Marianna Pierobon

Karl Kolter

Eberhard Schupp

Werner Bertleff

Klemens Mathauer

Helmut Meffert

Rainer Hummerich

Peter Spang

Tobias Petsch

Richard Baur

Eckehardt Wistuba

Robert Bayer

Bernhard Fussnegger

Peter Weyland

Reinhard Schneider

Lothar Maempel

Ralf Widmaier

Klaus Schnell

Angelika Maschke

Simone Schillo

Frank Müller

Marcos Gomez

Erik Bohrer

Uwe Bueltjer

Frank Fischer

Hubertus Folttmann

Karl-Otto Heilmann

Harald Armbruster

Jorg Kroker

Process for the preparation of low-peroxide crosslinked vinyllactam polymer by free-radical polymerization in the presence of at least one organic substance acting as antioxidant, low-peroxide crosslinked vinyllactam polymer obtainable by this process, and its use.

Process for the preparation of low-peroxide crosslinked vinyllactam polymer

Use of crosslinked polyvinylpyrrolidone with an average particle size of 5-60 &#x3bc;m and a hydration capacity of greater than 7 g/g as tablet disintegrant.

Fine-particle crosslinked polyvinylpyrrolidone as tablet disintegrant

Process for removal of residual styrene monomers from polystyrene and from blends comprising water-insoluble, crosslinked polyvinylpyrrolidone, via treatment with water, which comprises carrying out the treatment on a particulate solid blend.

Method for producing blends consisting of polystyrene and of a cross-linked polyvinyl pyrrolidone having a reduced styrene residual monomer content

Process for production of polymer blends which are suitable as filter aids and are composed of polystyrene and of crosslinked water-insoluble polyvinylpyrrolidones via processing of the two components in an extruder, which comprises melting polystyrene in an extruder and then treating it with the polyvinylpyrrolidone, and adding, to the mixture of the components, from 0.1 to 10% by weight of water, based on the total amount of polystyrene and popcorn polymer, and extruding and comminuting the mixture.

Method for producing polymer blends suited for use as filters

Incorporation of crosslinked polyvinylpyrrolidone in a specific particle composition as a disintegrant in compact particulate laundry detergents or cleaning products, such a particle composition and the compact particulate laundry detergents themselves, a process for preparing such a compact particulate laundry detergents or cleaning products, and a process for preparing specific particle compositions.

Use of cross-linked polyvinylpyrrolidone as a disintegrant in compact, particulate detergents and cleaning agents

The invention relates to the aqueous preparation of a polymer. Said preparation contains a copolymer consisting of a) 30 to 79.5 wt. % N-vinylpyrrolidone, b) 20 to 69.5 wt. % vinylacetate, c) 0.5 to 25 wt % of a monovinyl ester of a C to C monocarboxylic acid and d) 0 to 40 wt. % of an additional, copolymerisable, ethylenically unsaturated compound.

Thickeners for aqueous dispersions

The particle size of popcorn polymers is established during the popcorn polymerization by a process in which reaction mixtures forming popcorn polymers and comprising monoethylenically unsaturated monomers and a crosslinking agent are polymerized in the absence of oxygen and polymerization initiators at up to 200&deg; C. and in which the popcorn polymerization is carried out as a precipitation polymerization in water or in the absence of a solvent and the particle size of the popcorn polymers is controlled in the range from 1 &mgr;m to 10 mm by passing an inert gas stream into the reaction mixture, and popcorn polymers having a mean particle diameter of from >400 &mgr;m to 1500 &mgr;m are used as beverage clarifiers, antidiarrheal drugs and disintegration accelerators for tablets.

Method for adjusting the particle size of popcorn polymers during popcorn polymerization

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Weinheim, Germany

Michael Kerber