Isocyanate compositions for low density polyurethane foam
    10.
    发明授权
    Isocyanate compositions for low density polyurethane foam 失效
    用于低密度聚氨酯泡沫的异氰酸酯组合物

    公开(公告)号:US6133481A

    公开(公告)日:2000-10-17

    申请号:US21502

    申请日:1998-02-10

    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。