Albright & Wilson Limited

James E Stephenson

Robert Cole

Glynn Miller

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.

Flameproofing textiles

An improved process for manufacturing tetrakis (hydroxymethyl) phosphonium amide condensation product without the formation of a precipitate. Urea or thiourea is added to the tetrakis (hydroxymethyl) phosphonium salt having an anion formed from a dibasic or tribasic or polybasic acid. The said salt is in aqueous solution. The pH of the aqueous solution of said salt is adjusted to the range of 4-6.5 when the urea or thiourea is added to the salt. The proportion of said salt to said urea or thiourea is 1:0.05-0.5 (molar). The sulphuric acid salt is preferred. The process produces an improved aqueous product substantially free of insolubles.

Flameproofing agents

The invention provides a homogenous stable aqueous dispersion containing an organo-tin biocide and certain ammonium polyphosphate flame retardants which can be diluted and used to treat timber. The compositions further comprise a quaternary ammonium compound having surfactant activity, a derivative of carbamic acid and a hydrotrope which is an organic phosphate ester or an alkaryl sulphonate in order to maintain the active compounds in suspension. The biocidal activity is unaffected by the presence of the polyphosphate species.

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Birmingham, United Kingdom

James E Stephenson