Stabilization of C.I. pigment yellow 139

摘要

An alkali-resistant pigment composition is provided comprising (a) a C.I. Pigment Yellow 139 and (b) an adduct containing a compound of formula (II) or a tautomeric form thereof, wherein X is O, S or NR¹; Y is O, S or NR¹; the group -A-B— is selected from the group consisting of —CR²═CR³⁻, —CR⁴R⁵—CR⁶R⁷⁻, —CY—CR⁸R⁹⁻, —CX—NR¹⁰⁻, —CR¹¹═N—, —CR¹²R¹³⁻NR¹⁴⁻and R¹ is hydrogen, C₁-C₈alkyl, C₃-C₇cycloalkyl, C₆-C₁₀aryl or C₇-C₁₀aralkyl; R², R³, R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³ and R¹⁴ are independently of each other hydrogen, halogen, C₁-C₈alkyl, C₂-C₈alkenyl, or C₆-C₁₀aryl, or R² and R³ form a benzoannellated ring; and/or a melamine- or pyrimidine-based compound, which is optionally substituted. The pigment composition may be used as colorant in various applications, especially in coloring high molecular weight organic material, for example, coating compositions, paints, printing inks, liquid inks, plastics, films or fibers.;