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US 5,723,570 AGranted
Wholly aromatic polyamide fiber with improved dyeability
AssigneeIndustrial Technology Research Institute
InventorsJen-Chang Yang, Jin-Chyueh Lin, Lien-Tai Chen
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Abstract
A wholly aromatic polyamide fiber containing above about 600 ppm (about 0.2 mole percent) of sulfonate in the polymer main chain is provided. The sulfonate is represented by the general formulas (III) or (IV): ##STR1## where M is hydrogen, a metal cation, or a quaternary ammonium ion. The fiber exhibits excellent dyeability and can be cation-dyed without the use of a dye carrier.
Claims13
A fiber of wholly aromatic polyamide containing at least 85 mole percent of recurring structural units represented by the following general formulas (I) or (II):
- ----NR.sub.1 --Ar.sub.1 --NR.sub.2 --CO--Ar.sub.2 --CO--!--(I)
- ----NR.sub.3 --Ar.sub.3 --CO--!-- (II)
- wherein Ar.sub.1, Ar.sub.2 and Ar.sub.3 are aromatic radicals, and Ar.sub.1 and Ar.sub.2 are the same or different, R.sub.1, R.sub.2 and R.sub.3 are a lower alkyl group or hydrogen, and R.sub.1 and R.sub.2 are the same or different, and containing at least about 0.2 mole percent of sulfonate in the polymer main chain as represented by the general formulas (III) or (IV):
- ##STR6## wherein M is hydrogen, a metal cation, or a quaternary ammonium ion.
1 more element
Dependencies are inferred from the claim text.