Patent ID: 8075683

Claim:
A pigment of formula wherein R 1 is CONR 4 R 5 or C(═NR 6 )NR 7 R 8 , R 2 , R 3 , R 4 and R 5 are each independently of the others H, C 1 -C 5 alkyl, or phenyl which is unsubstituted or substituted from 1 to 5 times by C 1 -C 5 alkyl or by halogen, R 6 is phenyl which is unsubstituted or substituted from 1 to 4 times by C 1 -C 5 alkyl or by halogen, R 7 is H or C 1 -C 5 alkyl, and R 8 is a direct bond or a carbonyl bridge to R 6 , which pigment consists of primary particles having an average aspect ratio from 4 to 1, and/or having an average numerical eccentricity ε of from 0 to 0.80, the numerical eccentricity ε being defined as ɛ = a 2 - b 2 a , wherein a is the semimajor axis and b is the semiminor axis of the equivalent ellipse; wherein the pigment contains ≧90% by weight particles ≦0.50 μm and ≧50% by weight particles ≦0.40 μm.