首页>
外国专利>
New organosilicones polymers and their application to the production of cellular urethanes of the polyester type
New organosilicones polymers and their application to the production of cellular urethanes of the polyester type
展开▼
机译:新型有机硅聚合物及其在生产聚酯型多孔聚氨酯中的应用
展开▼
页面导航
摘要
著录项
相似文献
摘要
Organosilicone compositions are provided which comprise polysiloxane- polyoxyalkylene copolymers containing monofunctional siloxy units and difunctional siloxy units, an average of between about 2 and about 20 silicon-bonded cyano-bearing ether groups for every two moles of monofunctional units, said cyano-bearing ether groups having the formula, --(O).sub.q R'OR"CN, wherein q is zero or one, R' is bivalent alkylene of 3 to 8 carbon atoms and R" is bivalent alkylene of 2 to 4 carbon atoms, and an average of between about 2 and about 30 silicon-bonded, organic- capped polyoxyalkylene blocks for every two moles of monofunctional units, at least 75 weight percent of the polyoxyalkylene content of said copolymers being constituted of oxyethylene units, said monofunctional units having at least two alkyls bonded to the respective silicon atoms thereof and the difunctional units having at least one alkyl bonded to the respective silicon atoms thereof, the remaining organic group bonded to silicon of the respective monofunctional and difunctional siloxy units being alkyl, said cyano-bearing ether group or said polyoxyalkylene block. The polymers of the invention are effective stabilizers of flexible polyester polyol-based polyurethane foam and offer particular advantage in the formation of flame-retarded foam.
展开▼