Process for the preparation of copper phthalolcyanine

The production of copper phthalocyanine in accordance with German Offenlegungsschrift No. 2,432,564 is improved by the process which is characterized in that the reaction product formed at 130 DEG -300 DEG C from optionally substituted phthalic anhydride, reaction products of optionally substituted phthalic anhydride with ammonia, or the dehydration products thereof, urea and, optionally, a catalyst is reacted with a copper salt and, optionally, a catalyst at temperatures of 150 DEG -350 DEG C and preferably 170 DEG -300 DEG C with the proviso that the catalyst is added either during the preparation of the starting material or during the reaction with the copper salt.