Patent ID: 7470748

Claim:
A process for preparing fibers by spinning a polymeric composition consisting of: (i) from 80 wt. % to 98 wt. % of a random propylene copolymer comprising from 80 wt. % to 94 wt. % of propylene-derived units and from 6 wt. % to 20 wt. % of ethylene-derived units; and (ii) from about 2 wt. % to about 20 wt. % of a low density polyethylene, produced through a metallocene catalyzed polymerization reaction, having a density of 0.86 g/cm 3 to 0.92 g/cm 3 , a melt index of from 15 to 50 g/10 minutes, and a molecular weight distribution of 1.5 to 4.0, wherein the spinning is accomplished by first melting the composition at from 200 to 300° C. in an extruder, delivering the molten composition at a constant rate into a filter assembly to filter the molten polymeric composition followed by passing the molten polymer to one or more spinnerets having spinneret holes; wherein as molten polymeric composition passes through the spinneret holes, the forming fiber is drawn away and attenuated by a draw-down force applied by a forwarding or windup roll at a rate of greater than 2500 m/min.