Polyurethane elastomers with reduced gas permeability
    1.
    发明授权
    Polyurethane elastomers with reduced gas permeability 失效
    具有降低透气性的聚氨酯弹性体

    公开(公告)号:US5710233A

    公开(公告)日:1998-01-20

    申请号:US779198

    申请日:1997-01-06

    摘要: Polyurethane elastomers with reduced gas permeability are prepared by reaction of: a) diisocyanates, b) compounds with a molecular weight of 500 to 10,000 having at least two hydrogen atoms that are reactive towards isocyanates, c) compounds with a molecular weight of 61 to 499 having at least two hydrogen atoms that are reactive towards isocyanates, and optionally d) further auxiliaries and additives, characterized in that i) the ratio of the isocyanate groups in a) to the sum of the isocyanate-reactive groups in b) and c) is between 1:0.80 and 1:1.05 (isocyanate:isocyanate-reactive), and ii) the compound b) contains 3 to 15% by wt. of amide bonds ##STR1##

    摘要翻译: 具有降低的透气性的聚氨酯弹性体通过以下反应制备:a)二异氰酸酯,b)分子量为500至10,000的具有至少两个对异氰酸酯反应的氢原子的化合物,c)分子量为61至499的化合物 具有至少两个对异氰酸酯具有反应性的氢原子,以及任选地d)其它助剂和添加剂,其特征在于i)a)中的异氰酸酯基团与b)中的异氰酸酯反应性基团的总和的比例和c) 为1:0.80〜1:1.05(异氰酸酯:异氰酸酯反应性),ii)化合物b)含有3〜15重量% 的酰胺键