PROCESS FOR THE PRODUCTION OF INK CONCENTRATES

摘要

1. A process for the preparation of an ink concentrate which comprises (a) milling a crude metal phthalocyanine to reduce the particle size thereof, t hereby forming a modified crude metal phthalocyanine and (b) kneading a mixture of the modified crude metal phthalocyanine together with an ink vehicle comprising one or more ink solvents, the metal phthalocyanine being pres ent in an amount of 20 to 80% by weight of the kneaded mixture, to give an ink concentrate containing the metal phthalocyanine in pigmentary form dispersed in the ink vehi cle.