METHOD FOR DYEING ARAMID FIBERS AND DYED ARAMID FIBERS

WIPO Patent Application WO/2012/133662

A1

[Problem] To provide a method for dyeing aramid fibers which is applicable to any of para-aramid fibers, para-coaramid fibers, and meta-aramid fibers and by which aramid fibers are dyed in practical concentrations required for new applications of aramid fibers. The dyed aramid fibers have suffered neither considerable dyeing unevenness nor a considerable dimensional change nor a considerable decrease in material property. The dyed fibers further have satisfactory color fastness, in particular, light fastness. Also provided are dyed aramid fibers. [Solution] A dyeing method which comprises one or more dyeing operations each comprising a combination of the following steps: a dye application step in which a vat dye or a sulfur dye is applied to aramid fibers; a solvent treatment step in which the aramid fibers are treated with a treating liquid comprising a polar solvent; and a heat treatment step in which after the solvent treatment step, the aramid fibers are heat-treated according to need.

OIWA NORIHIRO (JP)
IMAI KAZUKI (JP)
SAYAMA SHOHEI (JP)
ITO TAKAHIRO (JP)
YASUI AKIRA (JP)

PCT/JP2012/058390

October 04, 2012

March 29, 2012

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TOKAI SENKO K K (JP)
OIWA NORIHIRO (JP)
IMAI KAZUKI (JP)
SAYAMA SHOHEI (JP)
ITO TAKAHIRO (JP)
YASUI AKIRA (JP)

D06P3/24; D06P1/22; D06P1/30; D06P5/02; D06P5/04

JP2008133552A	2008-06-12
JPS62268876A	1987-11-21
JPH0345790A	1991-02-27
JPH0376879A	1991-04-02
JPH0987979A	1997-03-31
JP2007262589A	2007-10-11
JPS5237882A	1977-03-24
JP2010059556A	2010-03-18

See also references of EP 2692942A4
J.E. MARK: "Physical Properties of Polymers Handbook", 1996, WOODBURY

MASE, Keichiro et al. (JP)
Mase けい Ichiro (JP)

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