Production process of phthalocyanine concentrates for paints

摘要

A process for the preparation of a paint concentrate which comprises (a) milling or acid pasting a crude metal phthalocyanine to reduce the particles size thereof, thereby forming a modified crude metal phthalocyanine and (b) kneading a mixture of the modified crude metal phthalocyanine together with a paint vehicle comprising one or more paint solvents, the metal phthalocyanine being present in an amount of 20 to 80% by weight of the kneaded mixture, to give a paint concentrate containing the metal phthalocyanine in pigmentary form dispersed in the paint vehicle.