发明名称 |
Preparation of chlorofluorocarbon-free flexible polyurethane foams using diphenylmethane diisocyanate-based polyisocyanate mixtures containing urethane groups, and modified polyisocyanate mixtures of this type |
摘要 |
The invention relates to a process for the preparation of CFC-free, flexible polyurethane foams or molded foams by reacting A) liquid polyisocyanate mixtures containing bonded urethane groups and having a content of NCO groups of from 20 to 30% by weight, these mixtures themselves being prepared by reacting a mixture of diphenylmethane diisocyanates and polyphenyl-polymethylene polyisocyanates (crude diphenylmethane diisocyanate) with a polyether-polyol mixture, having a hydroxyl number of from 120 to 25, of at least one polyoxypropylene glycol and at least one trifunctional polyoxypropylene-polyoxyethylene glycol having a content of ethylene oxide units of from 90 to 10% by weight or by reacting 4,4'-diphenylmethane diisocyanate (diphenylmethyl diisocyanate) or an diphenylmethane diisocyanate isomer mixture with said polyether-polyol mixture to give an NCO-containing quasi-prepolymer and diluting this quasi-prepolymer with crude diphenylmethane diisocyanate, with B) relatively high-molecular-weight polyhydroxyl compounds.
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申请公布号 |
US5596063(A) |
申请公布日期 |
1997.01.21 |
申请号 |
US19950430924 |
申请日期 |
1995.06.08 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
LUTTER, HEINZ-DIETER;BRUCHMANN, BERND;SPANG, CLAUDIA;MINGES, ROLAND;SCHERZER, DIETRICH;LUGMAYR, MICHAEL;ZSCHIESCHE, RUTH |
分类号 |
C08G18/12;C08G18/48;(IPC1-7):C08G18/10 |
主分类号 |
C08G18/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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