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US 5,232,461 AGranted
Method of dyeing aromatic polyamide fibers with water-soluble dyes
AssigneeE. I. Du Pont de Nemours and Company
InventorHamid M. Ghorashi
Life of this patent
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Abstract
Poly(p-phenylene terephthalamide) (PPD-T) fibers which have been dried are dyed with cationic dyes, or with disperse or acid dyes, by heating the fibers under a high pressure from 29 to 108 psi and at a temperature from 130.degree. to 180.degree. C.
Claims5
A method of dyeing poly(p-phenylene terephthalate) fibers including the steps of:
- placing the dry and crimped fibers in an aqueous bath containing a cationic, basic water-soluble dye,
- heating the fibers under a pressure of 29 to 108 p.s.i. and a temperature of 130.degree. to 180.degree. C. for a time sufficient to dye the fibers.
Dependencies are inferred from the claim text.