Polyurethane foams containing high levels of silicone-containing surfactant polymer to improve flame retardance and aged K-factors
First Claim
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1. A polyisocyanate based closed cell rigid foam comprising reacting an organic isocyanate and a polyol composition in the presence of a blowing agent comprising an aliphatic or cycloaliphatic C4 -C7 hydrocarbon, said polyol composition comprising:
- a) a polyol having polyester linkages and a number average molecular weight of 400 or more; and
b) at least about 8 php of a silicone-containing surfactant polymer.
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Abstract
There is now provided a closed cell rigid polyurethane foam made from a polyol composition containing a polyol having polyester linkages and a number average molecular weight of 400 or more, and at least about 8 php of a silicone-containing surfactant polymer. Either mixed into the polyol composition at the time of foaming, mixed into an isocyanate, or both, is an aliphatic or cycloaliphatic C4 -C7 hydrocarbon.
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21 Claims
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1. A polyisocyanate based closed cell rigid foam comprising reacting an organic isocyanate and a polyol composition in the presence of a blowing agent comprising an aliphatic or cycloaliphatic C4 -C7 hydrocarbon, said polyol composition comprising:
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a) a polyol having polyester linkages and a number average molecular weight of 400 or more; and b) at least about 8 php of a silicone-containing surfactant polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification