知搜-全球专利检索

  1. 登录
  2. 注册
发明授权
US6096238A Preparation of CFC-free, highly resilient, flexible polyurethane foams, and diphenylmethane diisocyanate-based polyisocyanate mixtures modified by means of urethane groups which can be used for this purpose 失效
制备无CFC，高弹性，柔性聚氨酯泡沫和通过可用于此目的的氨基甲酸酯基团改性的二苯基甲烷二异氰酸酯基多异氰酸酯混合物

Preparation of CFC-free, highly resilient, flexible polyurethane foams, and diphenylmethane diisocyanate-based polyisocyanate mixtures modified by means of urethane groups which can be used for this purpose
摘要：
The present invention relates to a process for the preparation of CFC-free, flexible polyurethane (molded) foams by reactingA) liquid polyisocyanate mixtures containing bonded urethane groups having a content of NCO groups of from 22 to 30% by weight which are themselves prepared by reacting a mixture of diphenylmethane diisocyanates and polyphenyl-polymethylene polyisocyanates having a content of diphenylmethane diisocyanate isomers of from 55 to 99% by weight, based on the total weight, with at least one trifunctional polyoxypropylene-polyol having a hydroxyl number of from 20 to 60, withB) relatively high-molecular-weight polyhydroxyl compounds and, if desired,C) low-molecular-weight chain extenders and/or crosslinking agents,in the presence ofD) blowing agents,E) catalysts and, if desired,F) auxiliaries and/or additives,and to the polyisocyanate mixtures (A) modified by means of urethane groups which can be used according to the invention.
摘要（中）：

本发明涉及一种制备无CFC的柔性聚氨酯（模制）泡沫的方法，其方法是使A）含有NCO基团含量为22-30％重量的结合氨基甲酸酯基团的液体多异氰酸酯混合物本身制备 通过使二苯基甲烷二异氰酸酯和聚苯基 - 多亚甲基多异氰酸酯的混合物与二苯基甲烷二异氰酸酯异构体的含量相对于总重量为55-99重量％与至少一种羟基数为20〜20的三官能聚氧丙烯 - 多元醇反应， 60，B）相对高分子量的多羟基化合物，如果需要，C）低分子量增链剂和/或交联剂，在D）发泡剂，E）催化剂存在下，如果需要， F）助剂和/或添加剂，以及通过可根据本发明使用的氨基甲酸酯基团改性的多异氰酸酯混合物（A）。

公开/授权文献
信息查询
Global Dossier Espacenet
0/0