发明授权
US5510432A Mixed blocked isocyanate prepolymers, a process for their production and
their use for the production of flexible epoxy resin systems
失效
混合的封端异氰酸酯预聚物，其生产方法及其用于生产柔性环氧树脂体系的用途
- 专利标题： Mixed blocked isocyanate prepolymers, a process for their production and their use for the production of flexible epoxy resin systems
- 专利标题（中）： 混合的封端异氰酸酯预聚物，其生产方法及其用于生产柔性环氧树脂体系的用途
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申请号： US454796申请日： 1995-05-31
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公开(公告)号： US5510432A公开(公告)日： 1996-04-23
- 发明人: Lutz Schmalstieg , Rainer Rettig , Eberhard Konig
- 申请人： Lutz Schmalstieg , Rainer Rettig , Eberhard Konig
- 申请人地址： PA Pittsburgh
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： PA Pittsburgh
- 优先权： DEX4421816.8 19940622
- 主分类号： C07D231/12
- IPC分类号： C07D231/12 ; C08G18/10 ; C08L63/00 ; C08L75/08 ; C08G18/80
摘要：
Isocyanate prepolymers based on an aromatic diisocyanate and a polyether polyol in which at least 95% of the isocyanate groups are blocked by blocking agents selected fromA) about 50 to about 97 equivalent % of a phenol or substituted phenol,B) about 30 to about 50 equivalent % of a pyrazole or a substituted pyrazole andC) 0 to about 10 equivalent % of a blocking agent different from A) and B).These blocked isocyanate prepolymers are particularly useful for the production of flexible epoxy resin systems.