Silicate extended polyurethane foam

Details Silicate extended polyurethane foam Silicate extended polyurethane foam

C - Chemistry, Metallurgy

08

L

403/28

C08L 75/06 (2006.01) C08G 18/08 (2006.01) C08G 18/38 (2006.01) C08G 18/40 (2006.01) C08J 9/00 (2006.01) C08J 9/04 (2006.01) C08L 61/00 (2006.01)

Patent

CA 1074950

(B) ABSTRACT OF THE DISCLOSURE Polyurethane foam products having relatively noncombus- tible properties, low flame spread ratings and low smoke generating tendencies when burned can be produced by com- bining aqueous alkali metal silicate into the foam forming composition which customarily includes a polyol and a poly- isocyanate along with a suitable catalyst, surfactant and inert blowing agent. The aqueous alkali metal silicate content of the foam forming ingredients constitutes from about 10 to 60 percent by weight. Aqueous sodium silicate having a weight ratio of SiO2/Na2O of 2.40 to 3.25 is pre- ferred as the silicate ingredient.

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