GB1080252A - Improvements relating to reactive disazo dyestuffs and their use - Google Patents

Abstract

The invention comprises reactive dyestuffs of general formula <FORM:1080252/C4-C5/1> wherein D is a sulphonated benzene or naphthalene radical containing neither hydroxyl or acylatable amino groups, Y1 is hydrogen or a C1-C2 alkyl or alkoxy group; Y2 is hydrogen, C1-C2 alkyl or alkoxy group or an acylamino group; R is hydrogen or a C1-C2 alkyl group; Z is a reactive acyl radical capable of reacting with cellulose and polyamide fibrous material to form a chemical bond and is an a - or b -halogeno-alkanoyl radical, an a - or b -halogeno- or an a ,b -di-halogeno-alkenoyl radical, an a ,b -alkenoyl radical, an a ,b -alkynoyl radical, a halogeno-nitrobenzene carboxylic or sulphonic acid radical in which the halogen is o and/or p to the nitro group or groups, or a mono or dicyclic radical comprising a 5- or 6-membered heterocyclic ring of aromatic character having at least one reactive grouping <FORM:1080252/C4-C5/2> which forms part of the heterocycle and ring A may also contain a sulphonic acid group. Preferably, D is a naphthalene 1-sulphonic 2-azo radical having 1 or 2 additional sulphonic acid groups. They are prepared by acylating the corresponding amino substituted disazo dye to introduce the Z radical or alternatively the diazonium compound of an amine D-NH2 is coupled with an appropriate coupling component. Conventional condensing and coupling procedures are used. The reactive dye products dye staple fibre, jute, ramie, hemp, cotton, wool, silk and synthetic polyamides, e.g. nylon in orange-red shades.ALSO:Staple fibre, jute, ramie, hemp, cotton, mercerised cotton, wool silk, and synthetic polyamides, e.g. nylon are dyed in orange-red shades using reactive disazo-dyes of the general formula <FORM:1080252/D1-D2/1> wherein D is a sulphonated benzene or naphthalene radical free from hydroxyl and acylatable amino groups, Y1 is hydrogen or a C1-C2 alkyl or alkoxy group; Y2 is hydrogen, a C1-C2 alkyl or alkoxy group or an acylamino group; R is hydrogen or a C1-C2 alkyl group and Z is a reactive acyl radical capable of reacting with cellulose or polyamide fibrous material to form a chemical bond, e.g. an a or b -halogen-alkanoyl radical; a or b halogeno or a , b dihalogeno-alkenoyl radical; a or b alkenoyl or alkynoyl radical, a halogeno-nitrobenzene carboxylic or sulphonic acid radical wherein the halogen is o and/or p to the nitro group or groups or is a mono or dicyclic radical comprising a 5 or 6 membered ring having at least one <FORM:1080252/D1-D2/2> group which forms part of the heterocycle.