Patent ID: 7255734

Claim:
A copper phthalocyanine pigment preparation comprising a copper phthalocyanine pigment and at least one pigment dispersant, wherein the at least one pigment dispersant is a compound of the formula (I) wherein T is a copper phthalocyanine radical substituted by 1 to 4 chlorine atoms or is chlorine-free; n is a number from 1 to 4; and E + is H + or the equivalent M s+ /s of a metal cation M s+ , s being one of the numbers 1, 2 or 3, and wherein the copper phthalocyanine pigment preparation exhibits a) at least one of a dynamic viscosity of not more than 180 mPas or a thixotropy of not more than 800 Pa/s, the dynamic viscosity and the thixotropy being determined with a rotational viscometer at a temperature of 23° C. in a pigment dispersion consisting of 28% by weight of dry copper phthalocyanine pigment preparation, 9% by weight of nitrocellulose, according to ISO 14 446, standard 27A, 62.3% by weight of ethanol and 0.7% by weight of ethyl acetate, and wherein the phthalocyanine pigment preparation exhibits b) a color strength that achieves ⅓ standard color strength if a printing ink consists of an ethanol/nitrocellulose gravure varnish containing 75% to 85% by weight of ethanol and 9% to 11% by weight of nitrocellulose in a ratio of 2:7.5 and a dry copper phthalocyanine pigment preparation content, based on the total weight of the printing ink, of not more than 6.6% by weight.