公开(公告)号：US4752626A

公开(公告)日：1988-06-21

申请号：US90008

申请日：1987-08-27

申请人： Robert J. Hoye ,  Vabilisetti S. Murty ,  Kaneyoshi Ashida ,  Chin-Jui Chang

发明人： Robert J. Hoye ,  Vabilisetti S. Murty ,  Kaneyoshi Ashida ,  Chin-Jui Chang

IPC分类号： B29C73/02 ,  C08G18/28 ,  C08G18/40 ,  C08G18/69 ,  C08G18/70 ,  C08G18/14

CPC分类号： B29C73/02 ,  C08G18/28 ,  C08G18/4063 ,  C08G18/698 ,  C08G18/70 ,  B29K2075/00 ,  B29K2105/045 ,  C08G2101/0008 ,  C08G2101/005 ,  C08G2101/0058

摘要： This invention generally relates to a high resilience urethane foam (HR foam) having low compression set at a wide range of isocyanate index for use in small void filling in integrated foam parts.The small voids formed in the molding process of integrated foam parts can be filled without penetration of foaming liquids into existing foam cells. In addition, resulting foams have very low compression set values at a wide range of isocyanate index.The foaming system of the present invention is composed of two components, i.e., thixotropic polyisocyanate component and thixotropic polyol component. Their thixotropicity is obtained by adding benzal sorbitol into respective components. The polyisocyanate is selected from organic polyisocyanates and the polyol component is prepared by mixing a polyol blend composed of a polyolefinic polyol and a polyoxyalkylene polyol in a weight ratio between 95/5 to 50/50, a blowing agent, a surfactant and a catalyst.

摘要翻译： 本发明一般涉及在广泛的异氰酸酯指数范围内具有低压缩永久变形的高回弹性聚氨酯泡沫（HR泡沫），用于集成泡沫部件的小空隙填充。 在一体化泡沫部件的成型过程中形成的小空隙可以填充而不会将泡沫液渗透到现有的泡沫单元中。 此外，所得泡沫在异氰酸酯指数的宽范围内具有非常低的压缩永久变形值。 本发明的发泡体系由触变性多异氰酸酯成分和触变性多元醇成分两部分组成。 通过将苯甲酸山梨糖醇加入到相应的组分中来获得它们的触变性。 多异氰酸酯选自有机多异氰酸酯，多元醇组分通过以95/5至50/50的重量比混合由聚烯烃多元醇和聚氧化烯多元醇组成的多元醇共混物，发泡剂，表面活性剂和催化剂来制备。