GB960243A - Improvements in or relating to reactive disazo dyestuffs - Google Patents

Abstract

The invention comprises dyes of formula <FORM:0960243/C4-C5/1> where A is a radicle which contains at least one substituent capable of reacting with the substrate with formation of a chemical link between the dye molecule and the substrate and C is the residue of a naphthalenic coupling component and B may contain substituents including an alkylene chain to form a second ring. The dyes may be made by treating the corresponding dye, in which A-HN-of the above formula is NH2, with an appropriate reagent for the introduction of A. A is preferably the radicle of an acid having at least one mobile halogen atom and/or unsaturated double or tryile carbon to carbon link in vicinal position to the CO group capable of addition, representative of those specified being chloroacetic; b -bromopropionic, propiolic, methacrylic, a -chloracrylic, b ,b - dibromoacrylic, trichloroacrylic, a -, b -, g - chlorocrotonic, maleic, mono-and di-bromomaleic, fumaric acid monoesters and dibromosuccinic or one of the following heterocyclic radicles cyanuric chloride and bromide, tetrameric cyanogen bromide and chloride, compounds of formula <FORM:0960243/C4-C5/2> where Y may be the residue of an aliphatic, alicyclic, aromatic or heterocyclic primary or secondary amine, hydroxy compound or thiol, 2,4,6-trichloro and -bromopyrimidines which may be substituted in the 5 position with e.g. methyl, carboxylic acid or sulphonic acid amide, carbomethoxy, acyl, alkylene, substituted alkyl, or a methylene group between two pyrimidine nuclei, 2,4,5,6-tetra-chloro- and -bromopyrimidines and 2,6-dichloro-pyrimidine-4-carboxylic acid ethyl ester. A may also be a diaryloxcyanuric, arylurethane, aryl-SO2-O-alkyl, HO-SO2-O alkyl, epoxy or b -chloro-or bromo-ethyl radicle. Indicated C components are naphthol-mono-, -di- and -tri-sulphonic acids, b -naphthol and aminonaphthol-mono- and -di-sulphonic acids and their N-acyl, -alkyl and -aryl derivatives e.g. 1-naphthol - 5 - sulphonic acid, 2 - naphthol -6,8 - disulphonic acid, 1 - naphthol - 3,6,8 - trisulphonic acid, 2 - amino - 8 - naphthol - 6 - mono - and - 3,6 - di-sulphonic acids, 1,8 - dihydroxynaphthalene-3,6 - disulphonic acid, 2 - acetylamino - 5-naphthol - 7 - sulphonic acid, 2 - (21,41,61 - trimethyl) - phenylamino - 8 - naphthol - 6 - sulphonic acid, 2N - carbomethoxyamino - 5-naphthol - 1,7 - disulphonic acid, 1 - (41,61 - di-chloro - 11,31,51 - triazinyl - (21) - amino - 8-naphthol -3,6 - disulphonic acid and 2 - (41,61 -dichloropyrimidyl - (21) - amino) - 5 - naphthol-1,7-disulphonic acid. Illustrative of specified B components are aniline, 3-acetyl-1-aminobenzene, 1 - amino - 2,5 - dimethoxybenzene, 1,3-diaminobenzene and 1 - amino - 2,3 - tetramethylenebenzene. The dyes colour animal, vegetable and synthetic fibres e.g. wool, silk, nylon, leather, cotton, hemp, linen, viscose and cuprammonium rayon. Animal and polyamide fibres are treated in an acid, neutral or weakly alkaline medium and cellulosic fibres preferably in an alkaline medium, heat usually being required for fixing. Acetate, triacetate and polyethylene terephthalate fibres are reserved. Numerous examples are provided of the preparation of the dyes and their use in dyeing processes. Red shades are obtained. Reference has been directed by the Comptroller to Specification 797,946, 822,047, 831,371, 858,183, 868,492, 886,379, 904,581, 908,109 and 916,094.