申请人:Bayer MaterialScience LLC
公开号:EP1873179A1
公开(公告)日:2008-01-02
This invention relates to low resilience, viscoelastic foams which have slower recovery and improved tear strength, and to a process for the production of these foams. The viscoelastic foams of the invention comprise the reaction product of a polyisocyanate with an isocyanate-reactive component, in the presence of a blowing agent, a surfactant and a catalyst. Suitable isocyanate-reactive components comprise at least about 5% by weight of at least one polyether polyol having about 2 to about 4 reactive hydroxyl groups per molecule, an equivalent weight of about 280 to about 2,000, and which is the alkoxylation product of an organic compound which contains at least two aromatic rings, contains from about 2 to about 4 Zerewitinoff active hydrogen atoms and has an equivalent weight of about 100 to about 575.
本发明涉及恢复速度较慢、撕裂强度较高的低回弹粘弹性泡沫塑料,以及生产这种泡沫塑料的工艺。本发明的粘弹性泡沫包括多异氰酸酯与异氰酸酯反应组分在发泡剂、表面活性剂和催化剂存在下的反应产物。合适的异氰酸酯反应组分包括至少约 5%(按重量计)的至少一种聚醚多元醇,其每个分子具有约 2 至约 4 个活性羟基,当量重量约为 280 至约 2,000,是一种有机化合物的烷氧基化产物,该有机化合物至少含有两个芳香环,含有约 2 至约 4 个 Zerewitinoff 活性氢原子,当量重量约为 100 至约 575。