Polyurethane foams containing high levels of silicone-containing surfactant polymer to improve flame retardance and aged K-factors
AssigneeBASF SE
InventorThomas L. Fishback
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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 C.sub.4 -C.sub.7 hydrocarbon.
Claims21
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 C.sub.4 -C.sub.7 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.
Dependencies are inferred from the claim text.