Aziende Colori Nazionali Affini Acna S.p.a.

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Sisto S Papa

Antonino Condo

Renzo Ferrario

Francesco De Feo

Enrico Traverso

Ugo Marangelli

Giancarlo Ciocci

The present invention relates to concentrated solutions in organic solvents of special mixtures of 1-4-dialkyl-amino-anthraquinone dyes particularly useful for the coloring of hydrocarbons. The solutions of this invention are particularly useful for the coloring of hydrocarbons obtained by distillation of crude oil such, for example, as petrol kerosene and gas oil. The invention also includes the preparation of the aforementioned concentrated solutions, including direct preparation of the solutions during the synthesis phase of the anthraquinone dyes.

Concentrated coloring solutions of a blue tinge based on mixture of

The sulfonated disazo dyestuff of the formula: ##STR1## is useful in dyeing cotton and other cellulosic fibers.

Water-soluble disazo dyestuff derived from 4,4-diaminobenzanilide

The present invention concerns a new acid trisazo dye suited for the dyeing of natural and synthetic polyamidic fibres and particularly for the dyeing of leather. The dye has the following structural formula: ##STR1## and dyes in a full black shade. The present invention also includes a process for the preparation of dye (I) and comprises tetrazotizing 4-4' diaminoazobenzene and then coupling the tetrazo-compound thus formed with 2 molecules of 2-carboxymethylamino-8-naphtol-6-sulphonic acid (carboxy methyl-gamma acid) in an alkaline medium.

Symmetrical trisazo dye obtained by coupling tetrazotized

A water-soluble triazo dyestuff of the formula: ##STR1## The dyestuff, which is useful in dyeing cotton and other cellulosic fibers, is prepared by diazotizing 2-aminophenol-4-sulfonic acid, coupling the diazotized sulfonic acid with resorcinol, treating the reaction mixture with a copper complexing agent at 35.degree.-40.degree. C and a pH of 5-5.5, separately tetraazotizing 4,4'-diaminobenzanilide, coupling the tetraazotate with the previously formed reaction product to form a diazo-disazoic reaction product, and coupling the latter product with m-aminophenol to produce the desired dyestuff.

Water-soluble trisazosulfonated dyestuff derived from

Azo dyes which are highly soluble in organic solvents are disclosed. The dyes have the general formula ##STR1## in which M = 1 TO 3;

Organic solvent-soluble azo dyes

Sulphonated azoic dyestuffs of the formula: ##SPC1## Are useful in dyeing cotton, other cellulosic fibers, natural and synthetic polyamide fibers and leather.

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Milan, Italy

Sisto S Papa