Abstract: The present invention relates to thermal bondable fibers comprising a random polymer of propylene with one or more olefins comonomers different from ethylene, to the process for preparing said fibers, and to the thermally bonded articles obtained from said fibers. Fibers of certain thermoplastic materials are used widely in the manufacturing of thermally bonded products.

Abstract: Process for the production of a high tenacity propylene polymer fiber which comprises:spinning fiber from a molten propylene polymer composition consisting essentially of an olefin polymer (I) and a high molecular weight propylene polymer (II) having a branching index less than 1 and melt strength from 5 to 40 cN; said propylene polymer (II) being present in a concentration from 0.1 to 10% by weight with respect to the total weight of the composition; anddrawing the solid fiber thus obtained with a draw ratio greater than 4.5 when the spinning step is continuous and greater than 5 when the spinning step is discontinuous.

Abstract: Process for the production of a high tenacity propylene polymer fiber which comprises:spinning fiber from a molten propylene polymer composition consisting essentially of an olefin polymer (I) and a high molecular weight propylene polymer (II) having a branching index less than 1 and melt strength from 5 to 40 cN; said propylene polymer (II) being present in a concentration from 0.1 to 10% by weight with respect to the total weight of the composition; anddrawing the solid fiber thus obtained with a draw ratio greater than 4.5 when the spinning step is continuous and greater than 5 when the spinning step is discontinuous.

Abstract: Process for the production of a high tenacity propylene polymer fiber which includes:spinning fiber from a molten propylene polymer composition which essentially includes an olefin polymer (I) and a high molecular weight propylene polymer (II) having a branching index less than 1 and melt strength from 5 to 40 cN; the propylene polymer (II) being present in a concentration from 0.1 to 10% by weight with respect to the total weight of the composition; anddrawing the solid fiber thus obtained with a draw ratio greater than 4.5 when the spinning step is continuous and greater than 5 when the spinning step is discontinuous.

Abstract: Polyolefin fibers, suitable for the preparation of nonwoven fabrics, prepared by using a spinneret or extruder with dies having a real or equivalent output diameter of the capillaries or holes greater than 0.4 mm, with the proviso that for fibers having a denier greater than or equal to 4 dtex, the ratio of the output capillary or hole diameter to the denier is greater than or equal to 0.06 mm/dtex.

Abstract: An olefin polymer composition is disclosed which comprises (by weight):(a) from 0.3 to 3% of a complex of general formula:R.(MeX.sub.3).sub.ywherein R is an amine; Me is bismuth or antimony; X is chlorine or bromine; y is a number from 0.3 to 4.0;(b) from 0.1 to 1% of poly(1,4-diisopropylbenzene);(c) from 0.1 to 0.5% of an organic epoxide;the balance to 100% being an olefin polymer.

Abstract: Disclosed is a simple, undrawn, 1-10 dtex, propylene polymer fiber, the thermowelding stength of which is at least 5 Newtons, the flexibility index of which is greater than 800, and which has good resistance to yellowing and aging. Also disclosed are a nonwoven fabric of said fiber, and a process of making the fiber.

Abstract: An olefin polymer composition is disclosed which contains (by weight):(a) from 0.3 to 3% of a complex of general formula:R.(MeX.sub.3).sub.ywherein R is an amine; Me is bismuth or antimony; X is chlorine or bromine; y is a number from 0.3 to 4.0;(b) from 0.1 to 1% of poly(1,4-diisopropylbenzene);(c) from 0.1 to 0.5% of an organic epoxide; the balance to 100% being an olefin polymer.