Phthalocyanine pigment preparations

Abstract

The invention relates to a copper phthalocyanine pigment preparation containing a copper phthalocyanine pigment and at least one pigment dispersant from the group of copper phthalocyanine sulfonic acids and copper phthalocyanine sulfonic acid salts. The inventive pigment preparation is characterized by a) a maximum dynamic viscosity of 180 mPas and/or a maximum thixotropy of 800 Pa/s, the dynamic viscosity and the thixotropy being determined by means of a rotary viscometer at a temperature of 23° C. in a pigment dispersion comprising 28 percent by weight of the (dry) copper phthalocyanine pigment preparation, 9 percent by weight of nitrocellulose (according to ISO 14446, standard 27A), 62.3 percent by weight of ethanol, and 0.7 percent by weight of ethyl acetate; and b) a color intensity that is so high that a printing ink consisting of an ethanol/nitrocellulose gravure varnish (containing 75 to 85 percent by weight of ethanol and 9 to 11 percent by weight of nitrocellulose according to ISO 14446, standard 27A and 30A at a ratio of 2 to 7.5) and a maximum amount of (dry) copper phthalocyanine pigment preparation of 6.6 percent by weight relative to the total weight of the printing ink, reaches the ⅓ standard depth of shade according to DIN 53235 of the corresponding tone.

Dependencies are inferred from the claim text.