Flame retardant finish for textiles
AssigneeAmerican Cyanamid Company
InventorsRobert George Weyker, William Frederick Baitinger, Jr.
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Abstract
Stable, aqueous, flame retardant finishes for cellulosic textile materials employing tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate and urea or a urea-formaldehyde condensate, and, processes employing said finishes are disclosed, together with processes for the preparation of the phosphonium compounds from tris(hydroxymethyl)phosphines.
Claims5
A process for preparing an aqueous flame retardant composition comprising tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and a urea or a urea-formaldehyde condensate, or both comprising
- reacting 1 mole of tris(hydroxymethyl)phosphine, at least 1 mole of formaldehyde and 1 mole of combined orthophosphoric acid and a carboxylic acid, the phosphoric acid representing between 10 and 75 mole percent and the carboxylic acid between 90 and 25 mole percent of the combined acids to obtain a concentrated solution and
- diluting the concentrated solution with water and adding urea or a urea-formaldehyde condensate in sufficient amount to provide a flameproofing composition containing between 0.5 and 3.0 moles of urea and/or urea-formaldehyde condensate per mole of combined phosphonium salts.
A process for imparting flame retardant properties to cellulosic textile materials comprising (1) applying a finish of tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and urea or a urea-formaldehyde condensate, or both to the textile material and (2) heating the textile material to effect a cure of finish thereon.
Dependencies are inferred from the claim text.