Basf Aktiengesellschaft

Rolf Moeller

Erhard Stahnecker

Hans G Keppler

Bruno Sander

Eckhard Bonitz

Rupert Schick

Werner Simmler

Harro Voss

Styrene polymers are prepared by suspension polymerization using, as suspension stabilizers, mixtures of

Manufacture of styrene suspension polymers

Particulate expandable styrene polymers having short minimum molding times which are coated with from 0.005 to 0.5% by weight, based on the expandable styrene polymer, of a mono- and/or poly-urethane melting below 150.degree. C. and obtained by reaction of

Particulate expandable styrene polymers having short minimum molding

Process for the manufacture of styrene polymers optionally containing blowing agent by polymerization in aqueous suspension using as the suspension stabilizer a calcium phosphate which after its manufacture by precipitation has been heated in aqueous dispersion for at least 2 hours at from 70.degree. to 130.degree. C. The styrene polymers may be used for the manufacture of foams.

A process for the manufacture of fibrids by dissolving, in a solvent, macromolecular waste materials from the bead polymerization of styrenes, and introducing the solution into a precipitation medium under the action of shearing forces to form fibrids.

Utilization of constituents of effluent from the manufacture of styrene

A process for the manufacture of expandable styrene polymers by suspension polymerization of the monomers in the presence of blowing agents and suspension stabilizers, the latter having been manufactured by polymerization of vinyl monomers in the presence of vinylpyrrolidone polymers. The expandable styrene polymers can be further processed to give foams.

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Ludwigshafen, Germany

Rolf Moeller