Process for making flame-resistant cellulosic fabrics
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United States of America Patent
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Aug 24, 1993
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N/A
app pub date -
Mar 23, 1992
filing date -
Jun 5, 1986
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Expired
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Abstract
Cellulosic fabrics are rendered flame resistant in a two-step procedure by applying first a tetrakis(hydroxymethyl) phosphonium salt/urea precondensate ammoniated to crosslink and form an insoluble phosphorus-containing polymer within the fiber structure followed by treatment with a tetrakis(hydroxymethyl) phosphonium salt. The two-step process using these chemically related phorphorus-containing flame retardants provide sufficient phosphorus in and on the cellulosic fabric to impart a predetermined minimum flame resistance. Cellulosic fabrics, primarily cotton, having flame resistant properties durable to washing yet retaining pliant, nont-stiff hand result.
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