PRODUCTION OF BETA-TYPE COPPER PHTHALOCYANINE PIGMENT

摘要

PROBLEM TO BE SOLVED: To obtain a greenishβ-type copper phthalocyanine pigment with the aspect ratio of its primary particles of 1-3. SOLUTION: This pigment with the aspect ratio of its primary particles of 1-3 is obtained by dry grinding of a crude copper phthalocyanine at 110-200 deg.C to form anα/βmixed crystal-type copper phthalocyanine which is then treated with an organic solvent or its mixture with water to transform theα-type crystal to theβ-type crystal.