Patent ID: 7166158

Claim:
A quinacridone pigment composition comprising (a) at least one symmetrical quinacridone of formula (b) at least one unsymmetrical quinacridone of formula and (c) at least one symmetrical quinacridone of formula in which R 1 is methyl, R 3 is hydrogen, and R 2 , and R 4 are each independently of the other hydrogen, C 1 –C 4 alkyl unsubstituted or substituted by halogen, C 1 –C 4 alkoxy, halogen, carbamoyl, N—C 1 –C 4 alkylcarbamoyl, N,N-di-C 1 –C 4 alkylcarbamoyl, N,N-di-C 1 –C 4 alkylamino, carboxy or nitro, wherein at least one of R 1 and R 2 is different from each of R 3 and R 4 and/or at least one of the positions of R 1 and R 2 is different from each of the positions of R 3 and R 4 , with the proviso that the unsymmetrical b) quinacridone is not 1,10-dimethylquinacridone or 1,10-dichloroquinacridone and comprising from 65 to 95% by weight of at least one symmetrical component of formula (1), and from 5 to 35% by weight of the sum of at least one unsymmetrical component of formula (2) and at least one symmetrical component of formula (3), based on the total weight of the components of formulae (1), (2) and (3) in the composition.