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    • 2. 发明授权
    • Bismuth/carboxylic acid catalysts for preparing elastomers
    • 用于制备弹性体的铋/羧酸催化剂
    • US4742090A
    • 1988-05-03
    • US846441
    • 1986-03-31
    • Douglas L. HunterDavid E. Schiff
    • Douglas L. HunterDavid E. Schiff
    • C07C53/128C08G18/22C08G18/14
    • C07C53/128C08G18/227C08G2120/00
    • This invention is a polyurethane-urea elastomer which is the reaction product of a reaction mixture comprising (1) a liquid active hydrogen-containing composition which comprises a relatively high equivalent weight active hydrogen-containing compound, and an amine-terminated, relatively low equivalent weight compound, (2) a polyisocyanate which is present in an amount to provide about 0.8 to about 1.5 isocyanate groups per active hydrogen-containing group present in the mixture, and (3) a catalytically effective amount of a bismuth carboxylate catalyst.With the use of the bismuth carboxylate catalyst, excellent pot-life, yet rapid cures are achieved. In addition the so-called "green strength" of the elastomer, i.e., its physical strength at the time of its removal from the mold, is improved with the practice of this invention. Further, the post-cured elastomer exhibits excellent properties.
    • 本发明是聚氨酯 - 脲弹性体,其是反应混合物的反应产物,其包含(1)含有相对高当量的含活性氢的化合物的含液体活性氢的组合物和胺封端的相对低的当量 重量化合物,(2)多异氰酸酯,其存在量为每混合物中存在的每个含活性氢基团提供约0.8至约1.5个异氰酸酯基团,和(3)催化有效量的羧酸铋催化剂。 通过使用羧酸铋催化剂,具有极好的适用期,而且快速固化。 此外,通过本发明的实践,弹性体的所谓“生坯强度”(即,其从模具移除时的物理强度)得到改善。 此外,后固化弹性体显示出优异的性能。