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    • 26. 发明授权
    • Two-stage process for the preparation of polycarbonate copolyether diols
    • 用于制备聚碳酸酯共聚醚二醇的两阶段方法
    • US5795952A
    • 1998-08-18
    • US818939
    • 1997-03-17
    • Alberto Greco
    • Alberto Greco
    • B01J23/02C07B61/00C07C68/06C07C69/96C08G18/44C08G64/18C08G64/30C08G64/32C08G64/00
    • C08G64/305C08G18/44C08G64/183
    • A process for the preparation of polycarbonate copolyether diols comprising two successive reaction stages wherein in the first stage the precursor, bisdimethylcarbonate of polyether diols is synthesized by reacting, in a reactor equipped with a distillation column, one or more polyetherglycols with dimethyl carbonate, in the presence of a basic catalyst selected from the group consisting of an oxide, a hydroxide, a carbonate and an alcoholate of a metal belonging to the group of alkaline or earth-alkaline metals and in the second stage, the precursor, after being freed from the catalyst and excess dimethylcarbonate, is converted to polycarbonate copolyether diols by transesterification reaction with polyetherglycols in the presence of a solvent and an organometallic catalyst selected from compounds of tin, lead, titanium, zirconium and antimonium, said polycarbonate polyether diols having utility as additives in the field of polyurethane end-products, thermoelastomers, paints and adhesives.
    • 一种制备聚碳酸酯共聚醚二醇的方法,包括两个连续的反应阶段,其中在第一阶段中,聚醚二醇的前体,双二甲基碳酸酯通过在装有蒸馏塔的反应器中与一种或多种聚醚二醇与碳酸二甲酯反应合成, 存在选自属于碱金属或碱土金属组的金属的氧化物,氢氧化物,碳酸盐和醇化物的碱性催化剂,并且在第二阶段中,所述前体在从 催化剂和过量的二甲基碳酸酯通过在溶剂和选自锡,铅,钛,锆和锑的化合物的有机金属催化剂的存在下与聚醚二醇进行酯交换反应而转化为聚碳酸酯共聚醚二醇,所述聚碳酸酯聚醚二醇可用作添加剂 聚氨酯最终产品领域,热弹性体,涂料和粘合剂 活塞