Patent · US Expired

Preparation of low residual solvent content polyacrylonitrile filaments

US4505870A · kind A · utility

0Cited by

5References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

Filing date	Jun 17, 1983
Grant date	Mar 19, 1985
Priority date	—
Expiry date	Jun 17, 2003

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD01D5/04
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Polyacrylonitrile filaments having a residual solvent content of less than 5% by weight and a total linear density of over 100,000 dtex can be prepared without contact with an extracting agent for the spinning solvent by a process in which PA0 (a) the spinning solution spun has a viscosity at 100.degree. C. of 10 to 60 falling-ball seconds, PA0 (b) the filaments are treated while still hot, directly at the end of the spinning cell, inside it or immediately outside the end of the cell, with a spin-finish which contains a lubricant and an antistat and which gives the filaments a moisture content of at most 10% by weight, relative to the solids content of the fibre, and PA0 (c) the filaments are immediately exposed to a heat treatment without cooling down first.

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