GB1085018A - Process for dyeing, padding and printing - Google Patents

Abstract

Azo dyes free from carboxylic and sulphonic acid groups and having the general formula <FORM:1085018/C4-C5/1> wherein A is the radical of an azo dye, y is a divalent organic radical, Z is a divalent radical which together with the shared N atoms forms a 5- or 6-membered saturated or unsaturated heterocyclic ring system, R1 is a substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical, R2 is also such a radical or a hydrogen atom or R1 and R2 together with the shared N atom forms a saturated or unsaturated 5- or 6-membered heterocyclic system, X is an anion and n is 1 or 2, are prepared by reacting one mole of a compound B-(-y - E)n, where B represents A or a group capable of formation of A with n moles of a compound <FORM:1085018/C4-C5/2> after which if necessary B is converted into A. Specifically, N-ethyl-N-b -chloro-ethyl aniline is reacted with trimethylene-pyrazolidine and the product coupled with a diazonium salt of 1-amino-2-chloro-4-nitro benzene. Other analagous azo dyes are named.ALSO:Textile materials are dyed, padded or printed using basic dyes free from sulphonic and carboxylic acid groups and having the formula:- <FORM:1085018/D1-D2/1> wherein A represents the radical of a dye, y is a divalent organic radical, R1 is a substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical, R2 is hydrogen or a substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical, or R1 and R2 together with the two N atoms bearing the substituents form a saturated or unsaturated 5- or 6- membered hetero cyclic ring system, Z is a divalent radical forming together with the two N- atoms a saturated or unsaturated 5- or 6- membered hetero cyclic ring system, X is an anion and n is 1 or 2. The dyes providing A may be, for example, of the mono or poly azo, metallised if desired, nitro, stilbene, poly aryl methane, methine, sulphur, anthraquinone, phthalocyanine and indigo series among others. The bridge member y is preferably a substituted or unsubstituted alkylene group whose carbon atoms can be separated from each other by hetero atoms. The terminal heterocyclic grouping may be derived from a pyrazolidine, pyridazine or pyrazoline and the anion X may be an organic or inorganic ion, including a complex anion e.g. that of a zinc chloride double salt. Dyeing may be carried out in aqueous medium especially in a neutral or acid medium at the boil. The preferred textile materials are made of acrylonitrile polymers or copolymers. The dyes can also be applied to leather and blend fabrics containing an acrylic fibre component; reference is also made to cotton, wool, silk, cellulosic fibres, polyamide fibres and paper. Examples describe the colouring of a polyacrylonitrile fibre fabric using a dyebath, padding liquor or printing paste comprising as dye the azo dyestuff obtained by coupling the diazonium salt of 1-amino-2-chloro-4-nitro benzene with the product obtained by reacting trimethylene-pyrazolidine with N-ethyl-N-b -chloro-ethyl aniline. Other similar azo dyestuffs are named.