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    • 81. 发明授权
    • Process for the production of segmented polyurethane urea elastomer
solutions and filaments and films thereof
    • 用于生产分段聚氨酯脲弹性体溶液及其长丝及其膜的方法
    • US5032664A
    • 1991-07-16
    • US586246
    • 1990-09-21
    • Beatrix FrauendorfMichael KauschRolf-Volker Meyer
    • Beatrix FrauendorfMichael KauschRolf-Volker Meyer
    • C08J5/18C08G18/08C08G18/10C08G18/65D01F6/70
    • C08G18/10C08G18/0852D01F6/70
    • The invention relates to a process for the production of highly concentrated and, surprisingly, viscosity-stable solutions of segmented polyurethane urea elastomers in highly polar solvents, such as dimethyl formamide and dimethyl acetamide, having little or no tendency to turn to paste, characterized by the use of certain primary and secondary cycloaliphatic monoamines or cycloaliphatic monisocyanates as chain-extending agents/blocking agents in the reaction of NCO prepolymers based on relatively high molecular weight dihydroxy compounds and (preferably aromatic) diisocyanates with aliphatic and and/or cycloaliphatic diamine chain-extending agents. The chain terminators according to the invention also show unexpected iprovements in the color of the elastomer solution and also in the stability of the end products, preferably filaments, to light and noxious gases.The invention also relates to elastomers of corresponding composition containing special terminators, preferably in the form of filaments, films or coatings showing improved stability to light and waste gases.
    • 本发明涉及在高极性溶剂如二甲基甲酰胺和二甲基乙酰胺中生产高度浓缩且令人惊奇的粘度稳定的分散聚氨酯脲弹性体溶液的方法,其具有很少或没有倾向于糊化的特征, 在基于相对高分子量的二羟基化合物和(优选芳族)二异氰酸酯的NCO预聚物与脂族和/或脂环族二胺链 - 二羧酸酯反应的反应中,使用某些伯和仲脂环族单胺或脂环族单异氰酸酯作为扩链剂/ 扩展代理。 根据本发明的链终止剂还显示出弹性体溶液的颜色的意想不到的渗透性,以及最终产物(优选长丝)对轻质和有毒气体的稳定性。 本发明还涉及包含特殊终止剂的相应组合物的弹性体,优选以丝,膜或涂层的形式显示出对光和废气的稳定性的改善。