Patent ID: 8152915

Claim:
A process for producing a pigment composition, comprising the step of milling together at 0 to 70° C. a composition comprising (a) a crude pigment; (b) from 8 to 15% by weight, based on the amount of crude pigment (a), of a chromophore substituted by sulfo; SO 3 R 1 ; alkali, earth alkali or N + R 1 R 2 R 3 R 4 sulfonato; SO 2 NR 1 R 2 ; CH 2 NR 1 R 2 , phthalimidomethyl, N-pyrazolylmethyl or N-saccharinylmethyl, wherein R 1 , R 2 , R 3 and R 4 are independently from each other hydrogen or C 1 -C 24 alkyl, C 3 -C 24 cycloalkyl, C 2 -C 24 alkenyl, C 7 -C 24 aralkyl or C 6 -C 24 aryl each unsubstituted or substituted by hydroxy and/or halogen, whereby alkyl may be uninterrupted or optionally interrupted from one to ten times by O, N(C 1 -C 8 alkyl) or NH, and phthalimido is unsubstituted or substituted by halogen or nitro; (c) from 20 to 55% by weight, based on the amount of crude pigment (a), of a resin selected from the group consisting of rosin, phenol-modified rosins, metal salts of rosin, metal salts of chemically modified rosins and mixtures thereof; (d) from 2 to 18% by weight, based on the total weight of (a) and (b), of an extender; and (e) optionally from 1 to 10% by weight, based on the amount of crude pigment (a), of an antioxidant and further optional components, wherein the composition remains pulverulent or granular during milling.