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公开(公告)号:US5216040A
公开(公告)日:1993-06-01
申请号:US617005
申请日:1990-11-21
IPC分类号: F25D23/08 , C08G18/00 , C08G18/48 , C08G18/50 , C08G18/72 , C08G18/80 , C08G101/00 , C08J9/02 , C08J9/14
CPC分类号: C08J9/144 , C08G18/4812 , C08G18/482 , C08G18/8029 , C08G2101/0025 , C08G2101/005 , C08J2375/04
摘要: A rigid polyurethane foam obtained by foaming a special polyol component and an isocyanate component in the presence of a blowing agent comprising water and at least one member selected from the group consisting of 1,1-dichloro-2,2,2-trifluoroethane and 2,2-dichloro-2-monofluoroethane possesses balanced excellent properties, has no surface void, and shows only slight expansion after molding. Therefore, it can be effectively used as a heat insulator, in particular, a heat insulator for refrigerators.