Basf Aktiengesellschaft

Basf Akteingesellschaft

Roland Gellert

Klaus Hahn

Uwe Guhr

Guiscard Gl&uuml;ck

Hans Hintz

Eckehardt Wistuba

Rolf Dersch

Johannes Vinke

Wolf-Dieter Back

Dietrich-Wolfgang Mueller

Heinrich Dehne

The invention relates to a process for preparing styrene polymers which comprise water as sole blowing agent, by polymerizing styrene in aqueous suspension in the presence of from 0.1 to 15% by weight of a solid substance insoluble in water and in styrene, for example carbon black or graphite.

Method for producing water expandable styrene polymers

The invention relates to a process for preparing styrene polymers comprising water as sole blowing agent, by polymerizing styrene in aqueous suspension. The polymerization is carried out in the presence of from 5 to 30% by weight of recycled EPS material dissolved in styrene and comprising customary coating agents deriving from production of the EPS.

Process for the preparation of polymer particles

Water expanded polystyrene particles

Bead-like expandable molding materials having high heat distortion resistance contain from 80 to 99% by weight of a styrene polymer, from 1 to 20% by weight of poly-(2,6-dimethyl)-1,4-diphenylene ether and from 3 to 10% by weight of a C.sub.3 -C.sub.6 -hydrocarbon as a blowing agent and may contain conventional additives. They are obtained by suspension polymerization of a solution of the polyphenylene ether in styrene.

Bead-like expandable molding materials having high heat distortion

Aqueous polymer dispersions essentially containing a copolymer of

Aqueous polymer dispersions for coating wood

Expandable styrene polymers formed from 50 to 83% by weight of polystyrene and from 17 to 50% by weight of styrene-soluble styreneacrylonitrile copolymer having a total acrylonitrile content of not less than 5% by weight, containing from 3 to 10% by weight of a C.sub.3 -C.sub.6 -hydrocarbon with or without customary additives, are notable for high oil resistance and can be prepared by suspension polymerization of a solution of the styrene-acrylonitrile copolymer in styrene.

Expandable styrene polymer of high oil resistance and preparation thereof

Styrene polymer foam particles of from 10 to 30 kg/m.sup.3 in density are obtained by foaming styrene polymers which, per kg, contain from 0.7 to 3 moles of blowing agent mixture composed of from 60 to 90 mol % of water and from 10 to 40 mol % of the C.sub.4 - or C.sub.5 -hydrocarbon with the aid of microwaves.

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Neustadt, Germany

Roland Gellert