Intumescent flexible polyurethane foam

Details Intumescent flexible polyurethane foam Intumescent flexible polyurethane foam

C - Chemistry, Metallurgy

08

K

403/9

C08K 3/22 (2006.01) C08G 18/42 (2006.01) C08J 9/00 (2006.01) C08K 5/34 (2006.01)

Patent

CA 1152698

ABSTRACT OF THE DISCLOSURE Flexible, resilient, polyurethane foam having improved flame retardancy and intumescent properties is prepared from a reaction mixture comprising a polyester polyol, an organic polyisocyanate, a blowing agent, a surfactant, and a catalyst, the improvement consisting of adding at least one melamine derivative wherein one or more hydrogens have been replaced by a methylol and/or lower alkoxymethyl group, a flame retardant, and hydrated alumina in substantially greater amounts than previously known. In a preferred embodiment, the hydrated alumina is predispersed in a mixture comprising the melamine derivative, the flame retardant, and a low-viscosity linear polyester polyol. These intumescent foams cease to burn within 0 - 10 seconds after removal of a torch flame, with little damage to the interior of the foam due to the formation of a heavy char layer.

377673

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