Process for the cold molding of particulate materials
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United States of America Patent
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Aug 10, 2004
Grant Date -
Aug 14, 2003
app pub date -
Jan 30, 2003
filing date -
Feb 14, 2002
priority date (Note) -
Expired
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Abstract
Particulate materials are cold molded by preheating a binder and the material to be bound to a temperature of from 160 to 240.degree. C., and then press molding at a temperature less than 80.degree. 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.degree. C. and a complex viscosity less than 15,000 Pa.multidot.s at 190.degree. C., and derived from one or more comonomer units from the group of vinyl esters of optionally branched C.sub.1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C.sub.1-15 alcohols, dienes, olefins, vinylaromatics, and vinyl halides. The moldings exhibit excellent properties including resistance to sagging at elevated temperatures, and are recyclable.
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