AZO DYES, METHOD FOR THEIR PREPARING AND THEIR USING IN STAINING HYDROPHOBIC FIBROUS MATERIALS OR PRINTING ON THEM Russian patent published in 2006 - IPC C09B29/42 C09B31/153 C09B67/22 

FIELD: organic chemistry, azo dyes.

SUBSTANCE: invention relates to azo dyes designated for coloring or printing on synthetic or semisynthetic fibrous materials. Invention describes azo dyes of the formula (1) given in the invention description comprising residue 2-NHR₃-3-cyano-4-methyl-NHR₂-methylpyridine as azo-containing component wherein R₂ means unsubstituted or substituted aryl radical or unsubstituted or substituted aralkyl radical; R₃ means unsubstituted or substituted aryl radical or unsubstituted or substituted aralkyl radical under condition that one of substitutes R₂ and R₃ represents unsubstituted or substituted aryl radical and another substitute represents unsubstituted or substituted aralkyl radical wherein indicated substituted aralkyl radical is not 2-hydroxy-2-phenylethyl. Also, invention describes mixtures comprising at least two structurally different azo dyes of the formula (1), and tricolor mixture based on red azo dye of the formula (1), sky-blue and yellow dye. Dye mixtures based on azo dye of the formula (1) possess the enhanced staining capacity as compared with individual dyes and increased stability of coloring to light and alkali at high temperatures.

EFFECT: improved and valuable properties of azo dyes.

10 cl, 2 tbl, 2 ex