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    • 7. 发明授权
    • Process for the preparation of aqueous dispersions or solutions of
isocyanate polyaddition products
    • 制备水分散体或异氰酸酯加成产物溶液的方法
    • US4240942A
    • 1980-12-23
    • US925674
    • 1978-07-18
    • Wolfgang WenzelWalter MeckelJosef Pedain
    • Wolfgang WenzelWalter MeckelJosef Pedain
    • C08G18/00C08G18/08C08G18/10C08G18/12C08G18/83C08G18/84C09D175/04C08J3/08C08L75/04
    • C08G18/12C08G18/0804C08G18/10C08G18/831C08G18/84C09D175/04
    • The present invention relates to a process for the preparation of aqueous dispersions or solutions of isocyanate polyaddition products characterized in that oligourethanes(a) which have an average molecular weight of less than about 15,000,(b) which contain from about 0 to 120 milliequivalents, per 100 g of solid content, of built-in ionic groups and/or from about 0 to 25% by weight, based on the total weight of the oligourethane, of built-in ethylene oxide units --CH.sub.2 --CH.sub.2 --O-- present within a polyether chain and/or from about 0 to 30% by weight, based on the total weight of the oligourethane, of external emulsifiers which are not chemically fixed, the total quantity of the aforesaid hydrophilic groups or external emulsifiers being sufficient to ensure the dispersibility or solubility of the oligourethanes in water, and(c) which contain primary or secondary amino end groups or semicarbazide end groups with at least one NH end groupare reacted in the aqueous phase with a chain lengthening agent which is at least difunctional and which undergoes an addition reaction or condensation reaction with the amino end groups or semicarbazide end groups to effect chain lengthening of the oligourethanes. The present invention also relates to the dispersions or solutions obtainable by this process and to their use for the production of films and coatings.
    • 本发明涉及一种制备异氰酸酯加成产物的水性分散体或溶液的方法,其特征在于平均分子量小于约15,000的低聚氨酯(a),(b)含有约0至120毫当量的 每100克固体含量的内置离子基团和/或约0至25重量%,基于低聚氨酯的总重量,内置的环氧乙烷单元-CH2-CH2-O-存在于 聚醚链和/或约0至30重量%,基于寡聚氨酯的总重量,未化学固定的外部乳化剂,上述亲水基团或外部乳化剂的总量足以确保分散性 或寡氨基甲酸酯在水中的溶解度,和(c)含有具有至少一个NH端基的伯或仲氨基端基或氨基脲端基在水相中与链长反应 该化合物至少是双官能的,并且与氨基端基或氨基脲端基进行加成反应或缩合反应,以实现低聚氨酯的链延长。 本发明还涉及通过该方法获得的分散体或溶液及其用于生产膜和涂料的用途。