Phthalocyanines, compositions derived therefrom and processes for their preparation

Abstract

Compounds falling within the formula: ##EQU1## in which Pc represents the residue of a phthalocyanine, R.sub.1 represents an alkyl group of low molecular weight or a cycloalkyl group, R.sub.2 represents a hydrogen atom, an alkyl group of low molecular weight or a cycloalkyl group, R.sub.3 represents a hydrogen atom or an alkyl group of low molecular weight, R.sub.1 and R.sub.2 or R.sub.1, R.sub.2 and R.sub.3 may also form a heterocyclic residue with the nitrogen atom and m and n each represent a whole or fractional number from 1 to 4; mixture of phthalocyanine pigments comprising a phthalocyanine pigment unstable to flocculation or sedimentation and at least one compound of the above formula; process for the stabilization of a phthalocyanine pigment comprising incorporating therein at least one compound of the above formula; process for the preparation of a compound of the above formula comprising reacting a phthalocyanine-sulphonate of the formula: Pc (SO.sub.3 M).sub.n (III) with an acetic solution of a phthalocyanine of the formula: ##EQU2## OR WITH AN AQUEUOS SOLUTION OF A PHTHALOCYANINE OF THE FORMULA: ##EQU3## at the rate of (n/mmoles of phthalocyanine of formula (IV) or (V) to one mole of compound of formula (III) and the solid is filtered off, drained and dried, wherein Pc, m, R.sub.1 and R.sub.2 have the meanings given in claim 1, R'.sub.3 represents either an alkyl group of low molecular weight or, together with R.sub.1 and R.sub.2, forms a heterocyclic residue and M represents sodium or potassium or the ammonium group, and paints, lacquers, ink and plastic material colored by means of a mixture of a phthalocyanine pigment unstable to flocculation or sedimentation and at least one compound of the above formula.

Dependencies are inferred from the claim text.