Fast cooling styrene polymer foams

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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260 25H, 260 25HB, 260827, C08F11208, C08F21208, C08J 904, C08J 906

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active

040174271

ABSTRACT:
Expandable styrene polymer particles which have fast cooling rates during molding are produced by suspending styrene polymer particles in an aqueous medium and impregnating a blowing agent into the particles in the presence of 0.05 to 0.4 parts of silicone surfactant per 100 parts of polymer particles. The silicone surfactant is selected from the siloxane-oxyalkylene copolymers having at least one polysiloxane block which contains mers of the general formula R.sub.2 SiO, where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and at least one polyoxyalkylene block containing mers of general formula C.sub.n H.sub.2n O, where n is 2, 3 or 4, attached to said polysiloxane block and terminated by hydroxyl groups.

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Frisch et al., Plastic Foams I, Part II, pp. 532-536, 538-540, 542, 543, (Dekker 1973).
Benning, Plastic Foams II, pp. 320-325 (Wiley-Inter-Science 1969).

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