Patent · US Expired

Set polyacrylonitrile filaments and fibers, and a process for their production

US4446206A · kind A · utility

7Cited by

4References

1Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Walter Fester · Königstein, DE
Bernd Huber · Schorndorf, DE

Key dates

Filing date	Mar 18, 1982
Grant date	May 1, 1984
Priority date	—
Expiry date	Mar 18, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2913
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The invention relates to filaments and fibers spun from at least 98% by weight of polyacrylonitrile and relative viscosities of between 2.5 and 6.0 which have tensile strengths of more than 50 cN/tex with an elongation at break of at most 15% and a shrinkage at the boil of less than 5% and to a process for their production which comprises at least 2 stretching stages with a minimum stretching ratio of 1:9 as well as a concluding setting stage in which the filaments are treated without shrinkage in dry heat at 170.degree. to 280.degree. C. Such filaments and fibers are distinguished by an increased resistance to swelling and hydrolysis and they are particularly suitable for reinforcing organic and inorganic materials.

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