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A Study of Nitrogen – Phosphorus Synergism in the Flame-retardant Finishing of Resin-treated Polyester-Cotton Blends

The effects of N-methylol finishing treatments on the flammability of a range of polyester-cotton blends treated with a flame retardant, namely diammonium hydrogen orthophosphate (DAP), are reported. Of the three resin systems studied only urea-formaldehyde (UF) in the UF-DAP-treated fabrics gives rise to nitrogen-phosphorus (N-P) synergism. The mechanism for N-P synergism in this treatment is shown to depend on a dual phase or (1>2) Inter Step mode of flame inhibition

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