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AssigneeWacker Polymer Systems GmbH & Co. KG
InventorsAbdulmajid Hashemzadeh, Klaus Kohlhammer, Thomas Lehmann, Peter Weiler
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Particulate materials are cold molded by preheating a binder and the material to be bound to a temperature of from 160 to 240° C., and then press molding at a temperature less than 80° C. and at a pressure of from 1 to 120 bar to give a molding, wherein the binder contains a polymer powder or aqueous polymer dispersion thereof, the polymer having a glass transition temperature Tg greater than 80° C. and a complex viscosity less than 15,000 Pa.s at 190° C., and derived from one or more comonomer units from the group of vinyl esters of optionally branched C1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C1-15 alcohols, dienes, olefins, vinylaromatics, and vinyl halides. The moldings exhibit excellent properties including resistance to sagging at elevated temperatures, and are recyclable.
A process for the cold molding of particulate materials employing a binder, comprising preheating the binder and the material to be bound to a temperature of from 160 to 240° C., followed by press molding at a temperature less than 80° C. and at a pressure of from 1 to 120 bar to produce a molding, wherein said binder comprises a polymer powder or an aqueous polymer dispersion thereof, the glass transition temperature Tg of the polymer being greater than 80° C. and the complex viscosity of the polymer being less than 15,000 Pa.s at 190° C., said polymer containing one or more comonomer units selected from the group consisting of vinyl esters of optionally branched C1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C1-15 alcohols, dienes, olefins, vinylaromatics, and vinyl halides.
Dependencies are inferred from the claim text.