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    • 9. 发明申请
    • Polymeric thickener for molding compounds
    • 聚合增稠剂用于模塑料
    • US20050182205A1
    • 2005-08-18
    • US11037908
    • 2005-01-18
    • Probir GuhaMichael SiwajekBrian Beach
    • Probir GuhaMichael SiwajekBrian Beach
    • C08F20/00C08F283/00C08F290/14C08G18/10C08G18/50C08L51/08
    • C08F283/00C08F283/006C08F290/147C08G18/10C08G18/5024C08L51/08C08G18/50C08L2666/02
    • A molding composition is provided that includes a thermoset cross-linkable polymeric resin, a fibrous filler and a thickener system. The thickener system includes an amine and an isocyanate that are reactive to form a polyurea. The polyurea is operative to thicken the molding composition formulation prior to polymeric resin thermoset with superior properties relative to conventional thickener systems. A molded article produced from a cross-linked thermoset polymeric resin containing fibrous filler and a polyurea present from 0.05 to 15 total weight percent of the article either forms an interpenetrating network between the resin and the polyurea or the resin and polyurea crosslink upon resin thermoset to further strengthen the resulting article. A process for thickening a molding compound includes adding a quantity of an isocyanate having an isocyanate group equivalent number and a quantity of an amine having an amine equivalent group number such that the isocyanate equivalent group number:amine equivalent group number ratio is between 10:1 and 1:10 to a molding composition formulation that contains a thermoset cross-linkable polymeric resin and a fibrous filler. A period of time is provided to allow the amine and isocyanate to react to form a polyurea prior to cross-linking of the thermoset cross-linkable resin.
    • 提供了一种模制组合物,其包括热固性交联聚合物树脂,纤维填料和增稠剂体系。 增稠剂体系包括胺和异氰酸酯,其可形成聚脲反应。 在聚合树脂热固性材料之前,聚脲可以使模制组合物配方变厚,相对于常规的增稠剂体系具有优异的性能。 由含有纤维填料的交联的热固性聚合物树脂制成的模制品和存在于该制品的总重量的0.05至15%的聚脲在树脂与聚脲或树脂之间形成互穿网络,并且在树脂热固化时交联聚脲 进一步加强所产生的文章。 增塑模塑料的方法包括加入一定量的具有异氰酸酯基当量数的异氰酸酯和一定量的具有胺当量数的胺,使得异氰酸酯当量数:胺当量数比为10:1 和1:10至含有热固性交联聚合物树脂和纤维填料的模塑组合物制剂。 提供一段时间以允许胺和异氰酸酯在热固性交联树脂交联之前反应形成聚脲。