Prepolymers of tris(1,3-dichloro-2-propyl) phosphate (DCPP) with polyethylenimine (PEI) were prepared, applied to cotton-containing fabrics, and cured at 155°C. The prepolymers imparted flame resistance to all-cotton and cotton/polyester blends. The most effective prepolymers were prepared from 3:1 and 5:1 mole ratios of DCPP: PEI. Practical potentialities for these finishes are limited because their durability to laundering is low.
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