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    • 8. 发明授权
    • Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for
closed-cell polymer foam production
    • 含有1,1,2,2-四氟乙烷(HFC-134)用于闭孔聚合物泡沫生产的组合物
    • US6121337A
    • 2000-09-19
    • US898980
    • 1997-07-23
    • Howard Sims HammelJoseph Anthony Creazzo
    • Howard Sims HammelJoseph Anthony Creazzo
    • C08J9/14
    • C08J9/146C08J2205/052
    • An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e.g., HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e.g., organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value. The present invention further relates to compositions comprising a blowing agent and an active hydrogen-containing compound, commonly referred to in the art as B-side compositions or blends, and using such compositions for producing polyurethane and polyisocyanurate foams in which the blowing agent comprises a major proportion of 1,1,2,2-tetrafluoroethane (HFC-134).
    • 涉及使用含氢卤代烃发泡剂(例如,HCFC-22)与有效量的形成氢键的封闭剂(例如有机醚,酯或酮)组合的改进的闭孔聚合物泡沫和发泡剂, 。 显示出阻塞剂的存在显着地减少了发泡剂从泡沫中逸出并进入泡沫中,导致较长时间内的低导热性和改善的绝热值。 本发明还涉及包含发泡剂和含活性氢的化合物的组合物,本领域通常称为B侧组合物或共混物,并且使用这种组合物制备聚氨酯和聚异氰脲酸酯泡沫,其中发泡剂包含 主要比例为1,1,2,2-四氟乙烷(HFC-134)。