Patent ID: 8173558
Filing Date: 2012-05-08
Classification: D04B,D10B,Y10T

Abstract:
1. A polyurethane elastomeric filament-containing weft knit fabric obtained by providing a polymer obtained by reacting a diisocyanate-terminated prepolymer (A) and a dihydroxy-terminated prepolymer (B), melt spinning the polymer without prior solidification to obtain a bare yarn of highly fusible, alkali-resistant polyurethane elastomeric filament having at least 50% retention of tenacity following dry heat treatment under 100% extension at 150° C. for 45 seconds, a melting point of 150 to 175° C., and at least 60% retention of tenacity following treatment in a 2 g/L aqueous sodium hydroxide solution under 100% extension at 100° C. for 60 minutes, separately feeding (i) the bare yarn and (ii) at least one type of non-elastomeric yarn, in order to form a weft knit fabric having a 1×1 rib knit structure by plating, such that the bare yarn is plated on the non-elastomeric yarn at every loop of the weft knit fabric, and then dry heat setting the plated structure at a temperature of 140 to 200° C. for 10 seconds to 3 minutes so as to thermally fuse the filaments of the bare yarn to each other or to the non-elastomeric yarns at crossover points therebetween, wherein 100 wt % of the total polymeric diol is polyether diol, and wherein the fabric has cut edges which are left in an as-cut state.