PROCESS FOR MAKING A NON-AQUEOUS DISPERSION OF A COOPER PHTHALOCYANINE

摘要

A method of preparing a non-aqueous dispersion of copper phthalocyanine (CuPc) which comprises milling crude CuPc in a high boiling liquid at a temperature from 50 to 150 DEG C in the presence of a polyester amine or polyesterammonium salt and a CuPc fluidising agent. Preferred polyesterammonium salt is obtainable by reacting polyhydroxystearic acid with 3-dimethylaminopropylamine quaternised with dimethylsulphate.