POLYESTER-STAPELFASERN UND VERFAHREN ZU DEREN HERSTELLUNG

摘要

Polyester staple fibres consisting of a polyester, from 0.1 to 2.0% by weight of an incompatible, thermoplastic, amorphous, polymeric additive having a glass transition temperature of from 90 to 170° C. and a ratio of its melt viscosity to that of the polyester component of from 1:1 to 10:1, and from 0 to 5.0% by weight of conventional additives, where the polymeric additive is present in the staple fibres in the form of fibrils having a mean diameter of <=80 nm.Process for the production of these staple fibres by mixing with shearing of the polyester and of the polymeric additive and, optionally, of the conventional additives, spinning at a spinning take-off speed of <2500 m/min to give spun filaments, which are combined to form tows and stretched in a separate fibre stretching stage, crimped, dried and chopped to give staple fibres.