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US 4,057,389 AGranted
Process for the printing with developing dyes
AssigneeHoechst Aktiengesellschaft
InventorsErich Feess, Willy Gronen
Life of this patent
Estimating the term…
Abstract
Cellulosic material is printed with a paste containing the alkaline solution of a coupler, the dispersion of a diazotable aromatic amine, a nitrite and a thickener, and the dyestuff is developed on the fiber by adding solutions of organic acids and, after a short air passage, contacting the dyeing or print with an alkaline agent.
Claims16
A process for printing cellulosic textile material with a printing paste containing
- a. the alkaline solution of a coupling component capable of forming developing dyes,
- b. the dispersion of a diazotable amine capable of forming developing dyes,
- c. sodium nitrite and
- d. a thickener,
- which process comprises developing the dyestuff on the fiber by adding a dilute aqueous solution of an organic acid of which at least 30 g are soluble in 100 g water, having at 20.degree. C a pK value of 4 to 2.5 and at normal pressure a boiling point above 175.degree. C, followed by a short air passage and a subsequent contact with an alkaline agent.
2 more elements
Dependencies are inferred from the claim text.