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95 条记录 (耗时 0.031 秒)

    Process for the production of segmented polyurethane urea elastomer solutions and filaments and films thereof
    81.
    发明授权
    Process for the production of segmented polyurethane urea elastomer solutions and filaments and films thereof 失效
    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

    公开(公告)号：US5032664A

    公开(公告)日：1991-07-16

    申请号：US586246

    申请日：1990-09-21

    申请人： Beatrix Frauendorf ,  Michael Kausch ,  Rolf-Volker Meyer

    发明人： Beatrix Frauendorf ,  Michael Kausch ,  Rolf-Volker Meyer

    IPC分类号： C08J5/18 ,  C08G18/08 ,  C08G18/10 ,  C08G18/65 ,  D01F6/70

    CPC分类号： C08G18/10 ,  C08G18/0852 ,  D01F6/70

    摘要： 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.

    摘要翻译： 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。

    Aromatic polyesters and polyester carbonates containing terminal aralkylphenyl groups, their production and use
    87.
    发明授权
    Aromatic polyesters and polyester carbonates containing terminal aralkylphenyl groups, their production and use 失效
    芳族聚酯和含有末端芳烷基苯基的聚酯碳酸酯，其生产和使用

    公开(公告)号：US4937311A

    公开(公告)日：1990-06-26

    申请号：US336692

    申请日：1989-04-12

    申请人： Ralf Dujardin ,  Rolf-Volker Meyer

    发明人： Ralf Dujardin ,  Rolf-Volker Meyer

    IPC分类号： C08G63/21 ,  C08G63/12 ,  C08G63/20 ,  C08G63/64

    CPC分类号： C08G63/64 ,  C08G63/20

    摘要： The new aromatic thermoplastic polyesters and polyester carbonates based on diphenols, dicarboxylic acids, chain terminators and, optionally, branching agents, which are characterized in that the chain terminators correspond to the following formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 may be the same or different and represent C.sub.2 -C.sub.12 alkyl or C.sub.8 -C.sub.20 aralkyl and at least one of the substituents R.sub.1 or R.sub.2 is a C.sub.8 -C.sub.20 aralkyl radical andn has a value of 0.5 to 1,are suitable for the production of moldings, films, fibers and filaments. The polyesters and polyester carbonates are distinguished by good thermal stability.

    摘要翻译： 基于二酚，二羧酸，链终止剂和任选的支化剂的新型芳族热塑性聚酯和聚酯碳酸酯，其特征在于链终止剂对应于下式（IMAGE），其中R 1，R 2和R 3可以是 相同或不同，代表C 2 -C 12烷基或C 8 -C 20芳烷基，并且至少一个取代基R 1或R 2是C 8 -C 20芳烷基，n具有0.5至1的值，适于制备模制品，薄膜 ，纤维和细丝。 聚酯和聚碳酸酯具有良好的热稳定性。