Intumescent flexible polyurethane foam
AssigneeG.F.C. Foam Corporation
InventorsHerman Stone, Peter D. Pauly, ; Michael P. Pcolinsky, Jr.
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Abstract
Flexible, resilient, polyurethane foam having improved flame retardancy and intumescent properties is prepared from a reaction mixture comprising a polyether polyol, an organic polyisocyanate, a blowing agent, a surfactant, a catalyst, a flame retardant, and hydrated alumina. Alternatively, the mixture also comprises a low-viscosity linear polyester. The hydrated alumina is predispersed in a mixture comprising flame retardant and low-viscosity linear polyester, and alternatively a char former and a fugitive viscosity modifier.
Claims36
In the process for the manufacture of a flexible, resilient, flame retardant and intumescent polyurethane foam from a reaction mixture consisting essentially of at least one polyether polyol, at least one organic polyisocyanate, at least one flame retardant, at least one blowing agent, at least one surfactant, and at least one catalyst, the improvement wherein the amount of said flame retardant is from about 30 to about 160 phr, and said reaction mixture also contains from about 200 to about 400 phr of hydrated alumina uniformly dispersed in from about 10 to about 100 phr of a low-viscosity, linear, polyester diol.
Dependencies are inferred from the claim text.