Patent · US Expired

Process for producing cross-sectionally stable, hygroscopic fibers and filaments having a core-jacket structure

US4438060A · kind A · utility

2Cited by

20References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Ulrich Reinehr · Dormagen, DE
Toni Herbertz · Dormagen, DE
Hermann-Josef Jungverdorben · Dormagen, DE

Key dates

Filing date	Nov 24, 1980
Grant date	Mar 20, 1984
Priority date	—
Expiry date	Nov 24, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2975
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Hygroscopic filaments or fibers with a core-jacket structure of hydrophobic, filament-forming synthetic polymers having a water retention capacity of at least 10% and having uniform round to oval cross-sectional profiles are obtained by a dry-spinning process which comprises addition of a substance to the spinning solvent which PA0 (a) has a higher boiling point than the spinning solvent used, PA0 (b) is readily miscible with the spinning solvent and with water, PA0 (c) is a non-solvent for the polymer to be spun, and addition of another substance which PA0 (a) is soluble in the non-solvent for the polymer to be spun, PA0 (b) is soluble in the solvent for the polymer PA0 (c) remains dissolved in the non-solvent for the polymer during solidification of the filaments, PA0 (d) is insoluble in water, and PA0 (e) does not evaporate to any significant extent during the spinning process, to the system in quantities of at least 1% by weight, based on polymer solids/spinning solvent/non-solvent carrying out the spinning process in such a way that the non-solvent does not evaporate to any significant extent in the spinning duct and washing out the non-solvent from the solidified filaments.

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