GB913604A - Water-insoluble disazo-dyestuffs derived from diamino-tetrachloro-diphenyl and process for their manufacture - Google Patents

Abstract

Water-insoluble dyes of the formula <FORM:0913604/IV(a)/1> where Z is a polycyclic aryl radical, are used to colour nitrocellulose and polyvinyl chloride resins. Values indicated for Z are of the naphthalene, anthracene, acenaphthene, pyrene, chrysene and phenanthrene series, naphthalenic residues being preferred. In Example (1) the dye 4,41-diamino-2,21,5,51-dichlorodiphenyl \sQ 1-acetoacetylaminonaphthalene is used to colour, in greenish-yellow shades, a nitrocellulose lacquer and a polyvinyl chloride composition consisting of the dye, P.V.C., dioctyl- and dibutyl-phthalates and titanium dioxide.ALSO:The invention comprises water-insoluble dyes of formula <FORM:0913604/IV (b)/1> where Z is a polycyclic aryl radical. The dyes are made in conventional fashion from appropriate diaminodiphenyl tetrazo and acetoacetyl coupling components. Coupling is preferably effected in the presence of a dispersing agent. The dyes may be made in substance, on the fibre or on another substratum. Coupling components indicated are of the naphthalene, anthracene, acenaphthene, pyrene, chrysene or phenanthrene series and they may contain substituents. e.g. halogen, alkyl, alkoxy, nitro, cyano or acylamino groups. Naphthalenic coupling components are preferred. Yellow dyeings are obtained on vegetable fibres, e.g. of regenerated cellulose, and rayon and viscose or cellulose ethers or esters, polyamides or polyurethanes may also be coloured. They also colour lacquers and solutions of acetylcellulose, nitrocellulose, natural and synthetic resins, e.g. amino- and pheno-plasts, polystyrene, polypropylene, polyacrylic compounds, polyvinyl chloride and acetate, caoutchouc, casein and silicone resins and are used in lake formation. Examples are provided of the preparation of the dyes and their use in colouring processes.