Direct Synthesis of Finely Powdered Copper Phthalocyanine Pigment

Abstract

Finely powdered copper phthalocyanine was synthesized by the reaction of phthalonitrile with urea and Cu(CH3COO)2.H2O in glycerine for about 15 min in two stages. In the first stage phthalonitrile (1mol) and urea (2-3mol) were heated in glycerine at 135-140 C for 5min. In the next stage powdered Cu(CH3COO)2.H2O or urea-glycerine solution of Cu(CH3.COO)2.H2O was added to this reaction mixture at 150-160 C during 10 min. under vigorous agitation.
Subsequently, glycerine was removed and the filter cake of pigment was washed to obtain fine powder copper phthalocyanine pigment for practical use. The Products was polymorphous metastable α-form with greenish blue color (λ=478.Onm) and the average particle size of the product was 0.25μ.