| 摘要 |
Composition comprising (a) from 1 to 20, preferably from 1 to 10 % by weight of a sorbitan ester of formula (I) wherein R1 and R2, independently from eac h other, stand for C1-C20alkyl or C2-C20alkenyl, and (b) from 99 to 80, preferably from 99 to 90 % by weight of a metal or ammonium laked monoazo pigment of formula (II) or formula (III) 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 R 10 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, an d M may be NH4+, or a cation of an alkali metal, an alkaline earth metal, such as Na, K, Mg, Ca, Sr, Ba, or a cation of a transition metal such as Mn, Co, Ni, Cu, Fe or Al, as well as a process for its preparation and its use as we ll as the use of the sorbitan ester I as additive to improve color strength and dispersion properties.
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