会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 76. 发明授权
    • Polyether polyol and rigid polyurethane foam
    • 聚醚多元醇和硬质聚氨酯泡沫
    • US5112876A
    • 1992-05-12
    • US426226
    • 1989-10-25
    • Yoshihiko TairakaKatsumi Inaoka
    • Yoshihiko TairakaKatsumi Inaoka
    • C08G18/48C08G18/50
    • C08G18/4845C08G18/5033C08G2101/0025C08G2101/005
    • The present invention relates to a polyether polyol which is prepared by(i) reacting 3.0 to 4.0 molecular equivalents of ethylene oxide with one molecular equivalent of 2,3- or 3,4-tolylenediamine, or a mixture thereof in the absense of catalyst, and thereafter,(ii) reacting 2.8 to 4.8 molecular equivalents of propylene oxide with one molecular equivalent of the reaction product in the presence of an alkali metal hydroxide in an amount of not more than 0.8% by weight based on the 2,3- or 3,4-tolylenediamine, or the mixture thereof.The present invention also relates to a rigid polyurethane foam which is prepared by reacting a polyol mixture containing not less than 50 wt % of the above-mentioned polyether polyol with an isocyanate. The rigid polyurethane foam is obtained with reduced fron requirements.
    • 本发明涉及一种聚醚多元醇,其通过以下步骤制备:(i)使3.0至4.0分子当量的环氧乙烷与一种分子当量的2,3-或3,4-甲苯二胺或其混合物在催化剂的缺失中反应, 然后,(ii)在碱金属氢氧化物存在下使2.8至4.8分子当量的环氧丙烷与一种分子当量的反应产物反应,其量为不超过0.8重量%,基于2,3-或 3,4-甲苯二胺或其混合物。 本发明还涉及一种刚性聚氨酯泡沫,其通过使含有不少于50重量%的上述聚醚多元醇的多元醇混合物与异氰酸酯反应而制备。 刚性聚氨酯泡沫塑料获得了较少的fron要求。