High tenacity propylene polymer fiber and process for making it
AssigneeMontell North America Inc.
InventorsLeonardo Pinoca, Renato Africano, Giancarlo Braca
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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; and drawing 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.
Claims4
A process for the production of a high tenacity polypropylene 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 centiNewton (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;
- and
- drawing 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.
Dependencies are inferred from the claim text.