Process for preparing hollow microporous polypropylene fibers

Details Process for preparing hollow microporous polypropylene fibers Process for preparing hollow microporous polypropylene fibers

D - Textiles, Paper

01

D

18/15, 18/615

D01D 5/247 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) B01D 71/26 (2006.01) D01D 5/24 (2006.01) D01F 6/06 (2006.01)

Patent

CA 1167211

Abstract of the Disclosure The present invention provides a process for pre- paring hollow microporous polypropylene fibers having an oxygen gas permeability of at least 35 cc/cm2.min at 10 psi. The high gas permeability is achieved by melt spinning isotactic polypropylene at a temperature of at least 230°C to form precursor hollow fibers having an average inner diameter of at least 140 microns, and an average inner diameter to average wall thickness ratio of from about 8:1 to about 40:1, annealing the precursor fibers at a temperature of about 50°C to not greater than 165°C, and subsequently cold stretching, hot stretching and then heat setting the microporus fibers. The resulting hollow microporous fibers exhibit an average inner diameter of at least 100 microns.

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