Importance

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Abstract

A method for achieving the flame retardancy of polypropylene fiber and for fabrics which include such fibers has been devised which has a low add-on finish. The finish comprises a mixture containing a bromochlorinated paraffin having a high concentration of bromine, up to 80% by weight, but, notwithstanding low add-on, the invention will produce an extremely effective fire retardancy where the bromine and chlorine constituents equal 20% and 40% respecively by weight of the bromochlorinated paraffin. Antimony oxide, preferably a antimony pentoxide is used, having a preferred particulate size in the range of 30-50 millimicrons. The quantity of antimony oxide to be used may be 1/3 mole to 1 mole of bromine. After the bromochlorinated paraffin is combined with emulsifiers to form a stable premix, the premix and antimony pentoxide are preferably combined with a binder consisting of an ethylacrylate latex. The foregoing mixture is used as a finish for polypropylene fibers or fabrics and when applied, produces a dry weight gain no greater than 5%-30%; however, for certain applications where seamslippage of the fabric is not important, the binder may be omitted. Since the binder is approximately 50% of the total weight when the binder is used, the coating without binder will produce a gain of 2.5% to 15% with only 8% gain as an average.

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First Claim