Sorbitan ester treated pigments for plastics applications

Composition consisting essentially of

• (a) from 1 to 20% by weight of a sorbitan ester of the formula I
• wherein
• R1 is —C1-C20alkyl or —C2-C20alkenyl, and
• each R2 is independently of one another hydrogen or —COC17alkenyl, and
• (b) from 99 to 80% by weight of a metal or ammonium laked monoazo pigment of formula II
• wherein
• R3, R4, R5, R6, R7 and R8 independently from each other stand for hydrogen, C1-C20alkyl, C1-C20alkoxy, C2-C20alkenyl, C1-C20alkylthiol, C1-C20alkoxycarbonyl, hydroxyC1-C4alkoxy, phenyl, benzyl, phenylthio, fluoro, chloro, bromo, iodo, —CN, —NO2, —CF3, —COR9, —COOR9, —CONR9R10, —SO2R9, —SO2NR9R10, —NR9NR10 in which each R9 and R10 are each independently from each other hydrogen, —OH, C1-4-alkyl or phenyl, where at least one of R3, R4, R5, R6, R7 and R8 is either —COOH or —SO3H, and M is NH4+, or a cation of an alkali metal, an alkaline earth metal or a transition metal.