GB995875A - Reactive metallised azo dyestuffs - Google Patents

Abstract

The invention comprises the copper, chromium or cobalt complexes of sulphonated mono-, dis- or tris-azo dyes which contain in o,o1-position to a least one azo group two hydroxy groups or a hydroxy group and a carboxy group, and which contain attached to a benzene or naphthalene ring in the dyes, one or two groups of formula <FORM:0995875/C4-C5/1> wherein V is a phenylene or sulphophenylene radical; m and p are 1 or 2: R is a hydrogen atom or a C1- 4 alkyl group; R1 and R2 are methyl groups and R3 and R4 are hydrogen atoms or methyl groups, or when R3 and R4 are hydrogen atoms R1 and R2 are joined to form a tetra- or penta-methylene radical, or R1 and R3 and R2 and R4 are joined together to form in each case a trimethylene radical and X is a divalent mono- or di-chloropyrimidyl, 5-cyanomonochloropyrimidyl radical or divalent 1,3,5-triazinyl radical substituted in the 6-position by a hydrogen atom, C1- 4 alkyl, C1- 4 alkoxy, phenyl, phenoxy, amino or substituted amino group. The dyes are prepared by reacting an appropriate metallized dye containing a group of formula <FORM:0995875/C4-C5/2> with a hydrazine of formula <FORM:0995875/C4-C5/3> Specified hydrazines include N,N,N1-trimethyl-and N,N,N1,N1 - tetramethyl - hydrazine, N-aminopiperidine or - pyrrolidine, 1,5 - diazabicyclo - (0: 3: 3) - octane and, preferably, N,N - dimethyl - hydrazine. The dyes may be used to colour wool, silk, polyamide and, preferably, cellulose fibres by the usual processes for reactive dyes. Examples describe the preparation of the dyes. Specifications 846,949, 850,559, 859,198, 863,758, 870,985, 882,890, 887,867, 895,449, 896,675, 896,785, 902,726 and 923,886 are referred to.