Fibres and nonwoven prepared from polypropylene having a large dispersity index

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 Mw/Mn of at least 7;
• (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 C4-C10 alpha-olefin, said random copolymer comprising up to 6% by weight of comonomer, relative to the total weight of the random copolymer;
• and wherein the Ziegler-Natta catalyst comprises a titanium compound, which has at least one titanium-halogen bond, and an internal donor, both supported on a magnesium halide in active form, with the internal donor comprising at least 80 wt %, with respect to the total weight of the internal donor, wherein the internal donor is a di-ketone or a enamino-imine.