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US 4,045,173 AGranted
Textiles flame retarded with hydroxymethylphosphorus compounds in combination with poly(ethyleneureas) and poly(N-methylolethyleneureas)
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorStanley P. Rowland
Life of this patent
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Abstract
Hydroxymethylphosphorus compounds are insolubilized in and reacted with cellulosic textiles by combination with poly(ethyleneureas) and poly(N-methylolethyleneureas) to impart durable flame retardancy to the textile. The poly(ethyleneurea) or poly(N-methylolethyleneurea) may be employed as the sole coreactant for the hydroxymethyl phosphorus compound or as a supplement to urea, N-methylolureas, and the like.
Claims2
A process for imparting durable flame retardancy to textiles comprising:
- (a) impregnating a textile fabric in an aqueous solution containing a nitrogeneous compound selected from the group consisting of a poly(ethyleneurea) made by reacting urea with a polyamine from the class of polyethylenamine or polyethyleneimine and a poly(N-methylolethyleneurea) made by the methylolation of the above-mentioned poly(ethyleneurea) and a phosphorus containing compound selected from the group consisting of tetrakis(hydroxymethyl)phosphonium chloride, tetrakis(hydroxymethyl)phosphonium hydroxide and tris(hydroxymethyl)phosphine;
- and
- (b) drying and curing the impregnated fabric from (a).
A process for imparting durable flame regardancy to textiles comprising:
- (a) reacting in an aqueous solution a nitrogeneous compound selected from the group consisting of a poly(ethyleneurea) made by reacting urea with a polyamine from the class of polyethyleneamine or polyethyleneimine and a poly(N-methylolethyleneurea) made by the methylolation of the abovementioned poly(ethyleneurea) and a phosphorus containing compound selected from the group consisting of tetrakis(hydroxymethyl)phosphonium chloride, tetrakis(hydroxymethyl)phosphonium hydroxide and tris(hydroxymethyl)phosphine;
- (b) impregnating a textile fabric in the solution from (a);
- and
- (c) drying and curing the impregnated fabric from (b).
1 more element
Dependencies are inferred from the claim text.