首页>
外国专利>
Surfactant for polyisocyanurate foams made with alternative blowing agents
Surfactant for polyisocyanurate foams made with alternative blowing agents
展开▼
机译:用其他发泡剂制成的聚异氰脲酸酯泡沫表面活性剂
展开▼
页面导航
摘要
著录项
相似文献
摘要
A closed cell, rigid polyisocyanurate foam which comprises the reaction product of a polyisocyanate and a polyol in the presence of (a) a hydrogen-containing blowing agent or a mixture of a hydrogen-containing blowing agent and at least one co-blowing agent, and (b) a siloxane oxyalkylene copolymer (i) having a molecular weight below about 7500 and oxyalkylene portion containing greater than 60 weight percent of oxyethylene units and (ii) being prepared by the reaction of an organohydrogensiloxane with a polyoxyalkylene in an essentially solventless system or in the presence of a high boiling point polar polyol.
展开▼