Patent · US Expired

Polyester-staple fibres and method for the production thereof

US6576339B1 · kind B1 · utility

2Cited by

2References

17Claims

0Family size

Assignee

Lurgi Zimmer GmbH · DE

Inventors

Ingo Cordes · Maintal, DE
Dietmar Wandel · Hanau, DE
Helmut Schwind · Hanau, DE
Wolfgang Janas · Geiselbach, DE
Werner Ude · Darmstadt, DE

Key dates

Filing date	Jun 24, 2002
Grant date	Jun 10, 2003
Priority date	—
Expiry date	Jun 24, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2969
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

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 &lE;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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.