发明名称 |
A PROCESS FOR PREPARING POLYURETHANE ELASTOMER FROM A SOFT-SEGMENT ISOCYANATE-TERMINATED PREPOLYMER |
摘要 |
This invention relates to a process of preparing polyurethane polymers by reaction of an isocyanate composition having an isocyanate equivalent weight of from 180 to 300 and comprising in from at least 50 weight percent a prepolymer, with an active hydrogen-containing substance in the presence of water which provides for at least 50 mole percent of the total blowing requirement. The prepolymer is obtained by reacting a molar excess of a polyisocyanate comprising, in from at least 70 weight percent, 4,4'-methylene diphenylisocyanate with an isocyanate-reactive composition containing (a) a branched diol or triol having a molecular weight of from 60 to 300, and (b) a polyoxyalkylene polyol or mixtures thereof having an average functionality of from 2 to 4 and a molecular weight of from 3000 to 12000, wherein the parts by weight ratio of (a):(b) is from 0.01:1 to 0.25:1. |
申请公布号 |
WO9222595(A1) |
申请公布日期 |
1992.12.23 |
申请号 |
WO1992US04954 |
申请日期 |
1992.06.11 |
申请人 |
THE DOW CHEMICAL COMPANY;DOW ITALIA S.P.A. |
发明人 |
BROOS, RENE;PAAP, FRANS;MACCARI, BRUNO |
分类号 |
C08G18/76;C08G18/10;C08G18/12;C08G18/42;C08G18/48;C08G18/65;C08G18/66;C08G101/00;C08J9/02;C08J9/14 |
主分类号 |
C08G18/76 |
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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