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AssigneeChemische Werke Huls Aktiengesellschaft
InventorsJosef K. Rigler, Ekkehard Wienhofer, Horst Leithauser, Karl Trukenbrod
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Fire retardant, expanded styrene polymer shaped objects are perpared by: (a) mixing styrene monomer or a mixture thereof with at least one comonomer, an expanding agent and a fire retardant, organic halogen compound in a aqueous dispersion; (b) adding to (a) either before or during polymerization from about 0.0001 to 0.1 percent by weight esters soluble in the organic phase of (a), these esters of aliphatic dicarboxylic acids and aliphatic epoxy alcohols having at least 11 carbon atoms; (c) polymerizing the aqueous dispersion of (a) and (b) using radical forming initiators at a temperature of about 80.degree. to 130.degree. C.; (d) separating bead polymers having diameters between about 0.4 and 3 mm; (e) pre-foaming the beads; (f) ageing the pre-foamed beads; and (g) final forming the aged and pre-foamed beads in a pressure resistant mold.
In a process for the preparation of shaped bodies based on expanded styrene or a mixture thereof with at least one monomer copolymerizable therewith, the addition of an expanding agent and a five retardant organic halogen compound, pre-forming of the resulting expandable particles, ageing of the formed particles, and molding thereof in a pressure resistant mold, the improvement comprising:
Dependencies are inferred from the claim text.