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US 4,094,637 AGranted
Process for the printing with developing dyes
AssigneeHoechst Aktiengesellschaft
InventorsErich Feess, Willy Gronen, Hasso Hertel
Life of this patent
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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 acidic steaming or by adding solutions of organic acids and steaming or drying.
Claims10
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 diazotble amine capable of forming developing dyes, said amine having an average particle size of 0.002 mm or less,
- c. sodium nitrite and
- d. a thickener,
- which process comprises printing said textile material with said printing paste, drying said printed material, developing the dyestuff on the fiber either by acidic steaming or 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, and steaming said material with neutral steam or immediately drying it.
2 more elements
Dependencies are inferred from the claim text.