Patent ID: 6537473
Filing Date: 2003-03-25
Classification: D01F,Y10T

Abstract:
A method for producing polyolefin fibers of high strength and elongation by processing a polypropylene, the method comprising the steps of:a), mixing polypropylene particles in a continuous mixer with about 0.05% to 3% by weight of a free radical-forming agent, based on an amount of the polypropylene particles used; b) adding a bifunctional monomer to the polypropylene particles of step a) from a gas phase at a temperature of about 20Â° to 120Â° C. and an average absorption time ts of about 10 seconds to 1,000 seconds wherein a proportion of the bifunctional monomer in the polypropylene particles being about 0.001% to 10% by weight, based on an amount of the polypropylenes particles used; c) melting the polypropylene particles of step b) under an atmosphere of inert gas at a temperature of about 110Â° to 210Â° C. to form a melt; d) heating the melt step c) to about 220Â° C. to 300Â° C. wherein unreacted monomer and decomposition products are removed; e) granulating the melt; and f) forming said polyolefin fibers from the granulate.