Vat acid dyeing of textile fibers
AssigneeInvista North America S.A.R.L.
InventorsStephen M. Birkinshaw, Samit N. Chevli, Michael O. Hunt, Jr., Lee D. Jones, David M. Lewis, David J. Marfell
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Abstract
A process for dyeing certain textile fibers, utilizing vat acid dyeing and specific additional (second) reducing agents such as α-hydroxyalkylsulfinic acids, their salts and 1,2,4-trithiolane, resulting in excellent depth of shade and washfastness, is provided.
Claims2
A solid mixture comprising at least one vat acid dye, at least one carboxylic acid comprising 12-22 carbon atoms, at least one reducing agent selected from the group consisting of sodium dithionite, α-hydroxyalkylsulfinic acids comprising 1-6 carbon atoms, water-soluble salts of such acids, 1,2,4-trithiolane, and mixtures thereof, and at least one surfactant.
Dependencies are inferred from the claim text.