专利内容由知识产权出版社提供
专利名称：Method for the manufacture of lightweight
foam materials from crystalline
thermoplastic materials and the resultantproducts
发明人：Ernst Lohmar申请号：US06/129166申请日：19800310公开号：US043522A公开日：19821005
摘要：This application is directed to light-weight and hard foam materials. The foamsof this invention are prepared by extruding thermoplastic crystalline plastics in thepresence of highly volatile organic liquids as the foaming agents. In accordance with thepresent method crystalline polyolefins, in the presence of polybutadiene,
ethylenevinylacetate copolymers, ethylene-propylenes and/or ethylene- propyleneterpolymer rubbers, and optionally radical formers such as suitable peroxides, azidene,sulfonyl azidene or the like, and inhibitors for radical decomposition, such astriallylcyanurate or an acrylate selected from the group consisting of
trimethylolpropane-trimethacrylate, allyl- methacrylate, tetrahydrofurfurylmethacrylate,triethyleneglycol- dimethacrylate, polyethyleneglycol-dimethacrylate or the like, areconverted into foam-like molded bodies by means of a highly volatile organic liquidfoaming agent. The foaming agent is employed in an amount of from about 5 to about30% by weight, based on the weight of the polyolefins. The foaming agent and thepolyolefins are mixed in an extruder at a temperature of from about 180° to about 280°
C., and at a pressure which is greater than the vapor pressure of the foaming agent. Themixture is subsequently extruded.
申请人：FIRMA CARL FREUDENBERG
代理机构：Kenyon & Kenyon
更多信息请下载全文后查看
