Patent ID: 6552123
Filing Date: 2003-04-22
Classification: D01F,D04B,D04H,Y10T

Abstract:
A thermoplastic polyvinyl alcohol fiber which comprises, as at least one component, a water-soluble polyvinyl alcohol, wherein the water-soluble polyvinyl alcoholcontains from 0.1 to 25 mol % of C1-4 &agr;-olefin units and/or vinyl ether units, has a molar fraction, based on vinyl alcohol units, of a hydroxyl group of vinyl alcohol unit located at the center of 3 successive vinyl alcohol unit chain in terms of triad expression of from 70 to 99.9 mol %, has a carboxylic acid and lactone ring content of from 0.02 to 0.15 mol %, and has a melting point (Tm) falling between 160Â° C. and 230Â° C., and contains an alkali metal ion in an amount in terms of sodium ion of 0.0003 to 1 part by weight based on 100 parts by weight of the polyvinyl alcohol.