Patent ID: 8283426
Filing Date: 2012-10-09
Classification: C08F,D01F,D04H,Y10T

Abstract:
1. A process for the production of fibers and filaments comprising: (a) polymerizing propylene and one or more optional comonomers in presence of a Ziegler-Natta catalyst and an organoaluminium compound to produce a polypropylene having a molecular weight distribution M (b) feeding the polypropylene to an extruder; (c) subsequently melt-extruding the polypropylene to obtain a molten polypropylene stream; (d) extruding the molten polypropylene stream of step (c) through a number of fine capillaries of a spinneret, thus obtaining filaments of molten polypropylene; and (e) subsequently reducing the diameter of the filaments obtained in the previous step to a final diameter, wherein the polypropylene produced in step (a) is either a propylene homopolymer or a random copolymer of propylene with one or more comonomers, said comonomers being ethylene or a C