SU11028A1 - The method of obtaining water-insoluble azo dyes - Google Patents

Description

The proposed method for the preparation of water-insoluble azo-dyes is based on the combination of a diazo tetrazo or diazo azo compounds not containing a sulfo or carboxyl group with an acyl acetyl amino amino, or acyl acetyl amine azo-oxo compounds of the general formula:

W. CO. SI ,. with Nn. where / and denote two identical or different aromatic radicals, or their substituted, Y - aliphatic, or aromatic residue, and X - azo - or azoxy group. Azo dyes from such acylacetic arylides have not yet been known. The affinity of these azocomponents to the plant fiber permits the formation of dyes on the fiber by the method of ice dyeing, without pre-drying of the refilled product, and thus obtaining colors that are completely durable to soap. When mixed with substrates commonly used in the manufacture of varnishes, new dyes provide valuable pigments. The following diazo components are used: aniline, its homologues and substitution products, such as toluidines, anisidines, chloro- and nitroanilines, chloro- and nitrotoluidines, chloro-and nitro-anisidines, then naphthylamines, amino-anthraquinones, amino-azo compounds, diamine compounds bases such as dianisidine, dichlorobenzidine, diaminodiphenyl ether, diamino - azo and azoxy compounds, etc. Unknown hitherto acyl acetyl amino azo or azo compounds can be prepared by heating the amino azo or azo compounds with acyl acetic esters. The properties of some of the compounds prepared in this way are indicated in the table below.

Example 1-25.5 parts of o-chloroaniline are diazotized in the usual manner and the diazo solution is poured into an alkaline solution of 64.5 parts of acetoacetyl-4-amino-4-chloro-benzene containing the necessary amount of sodium acetate. At the end of the combination, the dye is filtered off, washed thoroughly and rubbed into a paste. Mixed with commonly used substrates, it forms a very durable yellow varnish.

Example 2.-The formation of dyes on the fiber. Well-boiled and dried yarn is impregnated with a solution containing 10 g of aceto-acetyl-4-amino-azobenzene in a liter, or 10 g of aceto-acetyl-4-amino-3-nitro-azobenzene, 15 cc. soda solution of caustic soda

34 ° Be and 20 cu. see alizarin oil, squeeze thoroughly and, without pre-drying, exhibit a neutralizing solution with sodium acetate acetate containing 3 g of 5-nitro-1,2-toluidine per liter. So get with aceto-acetyl-4-amino-azobenzene yellow with acetoacetyl - 4-amino - 3 -nitro - azobenzene yellow with a reddish tinge, bright, strong color. New dyes can also be obtained by printing a diazo solution on the primed product in the usual way, as well as by the method of printing with nitrosamines.

The table below shows the shades of some dyes prepared in this way.

Patent Subject

The method for the preparation of insoluble i in water azo dyes in a substance, I on substrates or on fibers, characterized by the fact that the diazo components, containing neither sulfo or carboxyl groups, are combined with acyl-acetyl -amino;

azo - or acyl-acetyl-amino-azoxy compounds of general formula

y С6.СН2. CO.NH. R.X.R where R h R means two identical or different aromatic radicals, a y-fat or aromatic residue, and X-azo - or azoxy group.