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US 4,908,161 AGranted
Fire retardant for isocyanate-based foams comprising ammonium sulfate and a cyanuric acid derivative
AssigneeHarry Fischer
InventorKaneyoshi Ashida
Life of this patent
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Abstract
Ammonium sulfate powder is employed, alone, or in conjunction with a weakly basic powder to neuturalize the acidity of the sulfate, as a flame retardant for isocyanate-based foams and, in particular, rigid and flexible polyurethane foams.
Claims5
A flame retardant for a foam product prepared from an isocyanate and a polyhydric compound consisting essentially of an admixture of:
- (a) ammonium sulfate powder present in an amount ranging from from about 50 parts to about 150 parts by weight per 100 parts by weight of the polyhydric compound and
- (b) a cyanuric acid derivative selected from the group consisting of cyanamide, melamine, guanidine and biguanidine and mixtures thereof and present in an amount ranging from about 5 parts to about 100 parts by weight per 100 parts of ammonium sulfate.
Dependencies are inferred from the claim text.