Patent ID: 8128848

Claim:
A pigment composition of compounds of the formulae (I), (II) and (III), wherein the pigment composition has a median particle size (d 50 ) in the range from 10 to 60 nm, and less than 5% by volume of the particles being greater than 70 nm, obtained by reacting 1 mol of a succinic diester with 2 mol of a nitrile mixture A-CN and B-CN, the molar ratio of A-CN and B-CN in the nitrile mixture being in the range from 99.5:0.5 to 85.0:15, relative to each other, A-CN being 4-chlorobenzonitrile and B-CN being a nitrile of the formula (IV) wherein n is a number from 0 to 4; and X is OH, F, Cl, Br, CN, CF 3 , nitro, C 1 -C 8 -alkyl, C 5 -C 7 -cycloalkyl C 2 -C 8 -alkenyl, C 1 -C 8 -alkoxy, phenyl or benzyl.