| 摘要 |
There is now provided a polyol composition containing a polyol having polyester linkages and a number average molecular weight of 400 or more, and at least abou t 8 php of a silicone-containing surfactant polymer. Either mixed into the polyol compo sition at the time of foaming, mixed into an isocyanate, or both, is an aliphatic or cycloalip hatic C4-C7 hydrocarbon. The polyol composition is used to make a polyisocyanate based clos ed cell rigid foam by reacting an organic isocyanate and the polyol composition in the p resence of an aliphatic or cycloaliphatic C4-C7 hydrocarbon blowing agent. A method of mak ing a polyisocyanate-based closed cell rigid foam using the inventive polyol is also d isclosed.
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