| 摘要 |
Organosilicone compositions are provided which comprise polysiloxane-polyoxyalkylene copolymers containing monofunctional siloxy units (Mo) and, for every two moles of Mo, an average of between about 10 and about 200 difunctional dialkylsiloxy units, an average of between about 2 and about 100 silicon-bonded cyano-bearing ether groups (Q) having the formula, -(O)qR'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 (E), the polyoxyalkylene content of said copolymers being constituted of between about 20 and about 65 weight percent of oxyethylene units, said Mo units having at least two alkyls bonded to the respective silicon atoms thereof, the remaining organic group of Mo being alkyl, Q or E, said copolymers also containing difunctional monoalkylsiloxy units the remaining organic group bonded to the respective silicon atoms thereof being Q or E. The polymers of the invention are effective stabilizers of flexible polyether polyol-based polyurethane foam and offer particular advantage in the formation of flame-retarded foam. |
