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US 5,096,459 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
Aromatic polyamide fibers, which have been dried and/or crystallized, are steam dyed with a water-soluble dye padded onto the surface of fibers, along with a small amount of a carrier.
Claims22
A method of dyeing a tow of poly(m-phenylene isophthalamide) fibers, which tow has been dried, comprising the steps of
- padding onto the surface of the fibers of the tow an aqueous solution of from about 0.5 to 5 wt. % of a acetophenone carrier, based on the weight of the fibers, and from about 0.5 to 5 wt. % of a water-soluble cationic dye, based on the weight of the fibers, and thereafter
- heating the tow with steam at a temperature of about at least 120.degree. C. for a time sufficient to dye the fibers on and closely adjacent the surface thereof.
A method of dyeing a tow of poly(m-phenylene isophthalamide) fibers, which tow has been dried, comprising the steps of
- padding onto the surface of the fibers of the tow an aqueous solution of from about 0.5 to 5 wt. % of acetophenone carrier, based on the weight of the fibers, and from about 0.5 to 5 wt. % of a cationic water-soluble dye, based on the weight of the fibers, and thereafter
- heating the two with steam at a temperature of about 165.degree. C. for a time sufficient to dye the fibers to the center thereof.
A method of dyeing a tow of poly(m-phenylene isophthalamide) fibers, which tow has been dried, comprising the steps of
- padding onto the surface of the fibers of the tow an aqueous solution of from about 0.5 to 5 wt. % of a carrier, based on the weight of the fibers wherein said carrier is benzyl alcohol or a cyclic phosphorate ester, and from about 0.5 to 5 wt. % of a water-soluble cationic dye, based on the weight of the fibers, and thereafter
- heating the tow with steam at a temperature of about at least 120.degree. C. for a time sufficient to dye the fibers on and closely adjacent the surface thereof.
Dependencies are inferred from the claim text.