GB469139A - Improvements in the manufacture and production of dyestuffs - Google Patents

Abstract

Dyestuffs are produced by heating chlorinated or brominated phthalocyanines with organic hydroxyl compounds or their metal derivatives. The starting material may be a free chlorinated or brominated phthalocyanine or a metal derivative; examples are tetrachlor-phthalocyanine, copper phthalocyanines containing 4, 5 and 14 atoms of chlorine per molecule, and copper phthalocyanines containing 25, 45 and 47 per cent of chlorine. Suitable hydroxyl compounds are monohydric and polyhydric alcohols of the aromatic and aliphatic series and hydroxy compounds of the benzene, naphthalene and anthracene series; these are generally used in the form of their alkali metal derivatives and either singly or as mixtures, and also in the form of their nitro-, amino- and halogen compounds. Examples are alpha- and beta-naphthol, hydro-quinone, phloroglucin, amyl, dodecyl, cetyl, butyl, hexyl and benzyl alcohols, p-hydroxy-benzaldehyde, 8 - hydroxyquinoline, 1 - hydroxyanthraquinone, 1 : 5 - dihydroxynaphthalene, phenol, p-cresol, cyclohexanol, resorcinol. As diluents excess of the free hydroxyl compound or substances which do not take part in the reaction may be used, such as naphthalene, alkylnaphthalenes, aromatic nitro - hydrocarbons, dialkylanilines, pyridine, quinoline; it is advantageous to work under pressure. Metals which favour the splitting off of halogen may be added, e.g. copper or silver powder. When starting with a metal-free phthalocyanine, the replacement of the halogen and the introduction of a metal into the dyestuff may take place simultaneously. Samples have been furnished under Sect. 2 (5) of (1) a blue compound formed from a brominated copper phthalocyanine and alpha-naphthol, and (2) a blue-green compound formed from a copper phthalocyanine containing both chlorine and bromine, and alpha-naphthol.