Flameproofing textiles
AssigneeAlbright & Wilson Limited
InventorsRobert Cole, James E. Stephenson
Life of this patent
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Abstract
The cure efficiency for the treatment of fabrics with tetra(hydroxymethyl) phosphonium compounds and their precondensates e.g. with urea especially from THP sulphate, is improved by passing gaseous ammonia through impregnated fabric then wetting the fabric and completing the cure with more ammonia, preferably again passed it through the fabric.
Claims16
A process for flameproofing a cellulosic textile fabric, which comprises impregnating said fabric with an aqueous solution of pH 4-8 comprising a tetrakis(hydroxymethyl phosphonium) compound or a precondensate thereof with a nitrogen containing compound in a molar ratio of nitrogen containing compound to tetrakis(hydroxymethyl)phosphonium group of 0.05-0.5:1, drying the impregnated fabric, treating the fabric by passing it in contact with at least one duct having at least one orifice, through which gaseous ammonia is caused to issue and pass through the fabric, then wetting the treated fabric to give it a moisture content of 10-60%, and then passing said wetted fabric in contact with at least one duct having at least one orifice through which gaseous ammonia is caused to issue and pass through the fabric to give a cured fabric.
Dependencies are inferred from the claim text.