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1.发明授权Polyisocyanate based upon 4,4'- and 2,4'-diphenylmethane diisocyanates and use thereof in a rim process 失效基于4,4'-和2,4'-二苯基甲烷二异氰酸酯的多异氰酸酯及其在边缘工艺中的用途
公开(公告)号：US5350778A
公开(公告)日：1994-09-27
申请号：US144269
申请日：1993-10-28
CPC分类号： C08G18/6511 , C08G18/6529 , C08G18/7671 , C08G2120/00
摘要： Novel liquid, room temperature polyisocyanate having isocyanate group contents of from 6 to 31% by weight, are prepared by reacting:a) a methylene-bis(phenyl isocyanate) containing1) from 65 to 90% by weight of the 4,4'-isomer,2) from 10 to 35% by weigh of the 2,4'-isomer, and3) no more than 2% by weight of the 2,2'-isomer, with the percents of components a)1), a)2), and a)3) totalling 100%, andb) a mixture of:1) one or more organic compounds having molecular weights of from 400 to 6000 and containing from 2 to 8 isocyanate reactive groups, and2) one or more organic diols having molecular weights of from 60 to 200, excluding tripropylene glycol, the weight ratio of component b)1) to b)2) being from 150:1 to 5:1.When used in a RIM process, molded products are obtained which have improved tear strength, improved flexural modulus, improved impact resistance, and improved tensile strength.
摘要翻译： 异氰酸酯基含量为6〜31重量％的室温多异氰酸酯的液体，通过以下方法制备：a）含有1）的亚甲基双（苯基异氰酸酯）65至90重量％的4,4' 异构体，2）10至35重量％的2,4'-异构体，和3）不超过2重量％的2,2'-异构体，组分a）1）的百分比， a）2）和a）3）总计100％，和b）混合物：1）一种或多种分子量为400至6000的含有2至8个异氰酸酯反应性基团的有机化合物，和2）一种 或更多分子量为60至200的有机二醇，不包括三丙二醇，组分b）1）至b）2）的重量比为150:1至5:1。 当用于RIM工艺时，获得了具有改善的撕裂强度，改进的弯曲模量，改进的耐冲击性和改进的拉伸强度的模制产品。
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