Quaternary ureidomethyl phosphonium salts
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorArlen W. Frank
Life of this patent
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Abstract
Novel quaternary ureidomethyl phosphonium salts having the general formula ##STR1## are prepared by condensing a urea having the formula RNHC(O)NR'R" with a quaternary hydroxymethyl phosphonium salt having the formula (HOCH.sub.2).sub.4 P.sup.+ X.sup.- in a molar ratio of at least 2:1. The products, which are characterized by the absence of residual hydroxymethyl groups, are useful as finishing agents for imparting flame retardant properties to cotton fabrics.
Claims2
A process for imparting flame-retardant character to a cellulosic textile comprising:
- (a) impregnating the cellulosic textile with an approximately 1:1 molar mixture of octakis(ureidomethyl)diphosphonium sulfate and octakis(hydroxymethyl)diphosphonium sulfate in water;
- (b) squeezing the impregnated textile to about 100% wet pick-up;
- (c) curing the impregnated textile for about 10 minutes at about 100.degree. C.;
- and
- (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
A process for imparting flame-retardant character to a cellulosic textile, comprising:
- (a) impregnating the cellulosic textile with an approximately 4:1 molar mixture of urea and octakis(hydroxymethyl)diphosphonium sulfate in water;
- (b) squeezing the impregnated cellulosic textile to about a 100% wet pick-up;
- (c) curing the impregnated cellulosic textile for about 30 minutes at about 100.degree. C.;
- and
- (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
Dependencies are inferred from the claim text.