公开(公告)号：US6133481A

公开(公告)日：2000-10-17

申请号：US21502

申请日：1998-02-10

申请人： Sachchida Nand Singh ,  Michael John Cartmell ,  James Holloway

发明人： Sachchida Nand Singh ,  Michael John Cartmell ,  James Holloway

IPC分类号： C08G18/10 ,  C08G18/48 ,  C08G18/76 ,  C07C49/23

CPC分类号： C08G18/4837 ,  C08G18/10 ,  C08G18/7671 ,  C08G2101/0008 ,  C08G2101/005 ,  C08G2101/0083

摘要： Improved low density polyurethane foams are prepared from an isocyanate-terminated prepolymer having an NCO content of more than about 31 to about 33.5% by weight comprising:(a) a polyphenylene polymethylene polyisocyanate comprising(i) about 30 to about 100% by weight of diphenylmethane diisocyanate and(ii) the remainder selected from the group consisting essentially of higher homologues of polyphenylene polymethylene polyisocyanate, isocyanate-containing ester groups, urea groups, biuret groups, aliphatic groups, carbodiimide groups, isocyanurate groups, uretdione groups and urethane groups; and(b) a polyoxyalkylene polyol having an oxyethylene content of about 30 to about 90%, a molecular weight of about 1000 to about 12000 and a functionality of about 2 to about 8.

摘要翻译： 改进的低密度聚氨酯泡沫由NCO含量大于约31至约33.5重量％的异氰酸酯封端的预聚物制备，包括：（a）聚亚苯基多亚甲基多异氰酸酯，其包含（i）约30至约100重量％ 二苯基甲烷二异氰酸酯和（ii）选自基本上由聚亚苯基多亚甲基多异氰酸酯，含异氰酸酯的酯基，脲基，缩二脲基，脂族基，碳二亚胺基，异氰脲酸酯基，脲二酮基和氨基甲酸酯基的较高同系物组成的组中的余量。 和（b）具有约30至约90％的氧化乙烯含量，约1000至约12000的分子量和约2至约8的官能度的聚氧化烯多元醇。