Abstract: A process for the production of a highly pure copper phthalocyanine at high yields while improving the state of a reaction system, the improvement in which a dispersing agent of the formula (1) in the form of a polymer is added to the reaction system,A--(O--R.sup.1 --CO).sub.n --B (1)wherein A is hydrogen, a linear or branched alkyl group having 1 to 20 carbon atoms, a linear or branched alkenyl group having 1 to 20 carbon atoms or a polyisobutylene residue having a polymerization degree of 50 to 500, R.sup.1 is a linear or branched aliphatic residue having up to 20 carbon atoms, n is a number in the range of 0.ltoreq.n.ltoreq.20, and when n=0, B is a compound of the formula (2), ##STR1## wherein P is (CH.sub.2 CH.sub.2 NH).sub.k CH.sub.2 CH.sub.2 NH.sub.2 in which k is an integer of 0 to 20 or an alkyleneamine group having 3 to 20 carbon atoms, or when n.noteq.0, B is a compound of the formula (3),--X--(C.sub.m --H.sub.2m)--Q (3)wherein X is --NH-- or --O--, m is a number of 0 to 6 and Q is --NR.sup.2 R.sup.

Abstract: A process for the manufacture of an azo metal salt pigment, wherein a transparent or translucent alkaline aqueous solution of a resin and a dispersant of formula (1) or formula (3) is added to an azo compound, said formula (1) beingYCO--OM (1)whereinYCO is the residue of a polyester derived from a hydroxycarboxylic acid, andM is H, a metal or optionally substituted ammonium, and said formula (3) beingYCO--Z--R (3)whereinZ is a divalent bridging group containing an oxygen or a nitrogen atom through which Z is attached to the carbonyl groupR is a primary, secondary or tertiary amino group or a salt thereof with an acid, or a quaternary ammonium salt group, andYCO is as herein defined.