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    • 7. 发明授权
    • Prepolymers containing isocyanate groups and a method for the production thereof
    • 含有异氰酸酯基团的预聚物及其制备方法
    • US06495652B1
    • 2002-12-17
    • US09673046
    • 2000-10-09
    • Michael ReicheltUdo RotermundRenate HempelPeter FalkePeter von MalotkiHolger Seifert
    • Michael ReicheltUdo RotermundRenate HempelPeter FalkePeter von MalotkiHolger Seifert
    • C08G1876
    • C09K3/1021C08G18/10C08G18/5006C08G18/7664C08G2101/0008C08G2101/0025C08G2101/0083C08G18/6674
    • Prepolymers which contain isocyanate groups, have an NCO content of at least 30.0% by weight and can be prepared by reacting an isocyanate mixture consisting predominantly of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates and having a proportion of two-ring isomers of not more than 74% by weight with at least 4-functional polyols or a mixture of polyols having a mean functionality of at least 4, where the polyols or polyol mixtures have a hydroxyl number of from 200 to 1650 mg KOH/g and a number average molecular weight of less than 1100 g/mol. The present invention also provides a process for preparing these prepolymers containing isocyanate groups, provides for their use for producing polyurethanes and provides a process for producing polyurethanes by reacting at least one novel prepolymer containing isocyanate groups, if desired in admixture with further organic and/or modified organic isocyanates (a), with compounds having at least two reactive hydrogen atoms (b) in the presence of, if desired, blowing agents (c), catalysts (d) and, if desired, further auxiliaries and/or additives (e).
    • 含有异氰酸酯基的预聚物的NCO含量至少为30.0重量%,可以通过使主要由二苯基甲烷二异氰酸酯和聚苯基聚亚甲基多异氰酸酯组成的异氰酸酯混合物与二苯基聚亚甲基多异氰酸酯的比例为不超过74%的双环异构体比例 重量与至少4-官能多元醇或平均官能度至少为4的多元醇的混合物,其中多元醇或多元醇混合物的羟值为200至1650mg KOH / g,数均分子量小于 1100g / mol。 本发明还提供了制备这些含有异氰酸酯基团的预聚物的方法,提供了它们用于生产聚氨酯的方法,并且提供了通过使至少一种含有异氰酸酯基团的新型预聚物(如果需要)与另外的有机和/或 如果需要,发泡剂(c),催化剂(d)和(如果需要的话)其它助剂和/或添加剂(e)的存在下,改性有机异氰酸酯(a),具有至少两个反应性氢原子的化合物(b) )。
    • 8. 发明授权
    • Microcellular polyurethane elastomer containing urea groups
    • 含有尿素基团的微孔聚氨酯弹性体
    • US6037383A
    • 2000-03-14
    • US91638
    • 1998-10-07
    • Ruediger KrechUdo RotermundHeinz BollmannRenate HempelWolfgang ScholzManfred Genz
    • Ruediger KrechUdo RotermundHeinz BollmannRenate HempelWolfgang ScholzManfred Genz
    • C08J9/36C08G18/08C08G18/76C08G18/04
    • C08G18/7664C08G18/089C08G2101/0066C08G2101/0083C08G2350/00
    • A microcellular PU elastomer having improved dynamic mechanical properties and based on an isocyanate component consisting essentially of 4,4'-MDI and further customary constituents has a physicochemical structure which, in the gel permeation chromatograph (GPC) of a solution of the microcellular polyurethane elastomer prepared at 90.degree. C. in N,N-dimethylformamide containing 1 percent of di-n-butylamine measured against polymethyl methacrylate (PMMA) as standard, displays a signal occurring in addition to low molecular weight main signal and comprising one or more peaks at an (apparent) molar mass of greater than 250,000 g/mol which becomes smaller or disappears on addition of lithium chloride to this solution, and a urea content of from 14 to 18% by weight.A process is also provided for preparing such a microcellular PU elastomer having improved dynamic mechanical properties. The microcellular PU elastomers can be used for producing damping elements.
    • PCT No.PCT / EP96 / 05640 Sec。 371日期:1998年10月7日 102(e)日期1998年10月7日PCT 1996年12月16日PCT公布。 出版物WO97 / 23535 日期1997年7月3日具有改善的动态力学性能并基于由4,4'-MDI和其他常规组分组成的异氰酸酯组分的微孔PU弹性体具有物理化学结构,其在溶液的凝胶渗透色谱(GPC) 在90℃下在含有1%二正丁胺的N,N-二甲基甲酰胺中制备的聚氨基甲酸甲酯(PMMA)作为标准的微孔聚氨酯弹性体显示除了低分子量主信号之外还发生的信号,并且包含 摩尔质量大于250,000g / mol的一个或多个峰变得更小或在向该溶液中加入氯化锂时消失,尿素含量为14至18重量%。 还提供了一种制备这种具有改进的动态力学性能的微孔PU弹性体的方法。 微孔PU弹性体可用于制造阻尼元件。