MANUFACTURING METHOD OF DIARYLIDE YELLOW PIGMENTS WITH AN INCREASED TINTING STRENGTH AND AN IMPROVED DISPERSIBILITY

摘要

The present invention relates to a method for preparing a diarylide yellow organic pigment having high coloring power and dispersibility, and in particular, in order to use the diarylide yellow organic pigment in a plastic molded article immediately before the coupler recrystallization step. By treating with ammonium salts or polyamines, it is possible to prevent agglomeration of coupler particles to be recrystallized, to prevent agglomeration between pigment particles formed at the time of coupling, and to increase the binding speed to increase the color development or coloring power of the plastic molded article and to improve dispersibility. The present invention relates to a method for producing a diarylidene-based yellow organic pigment.;Diarylide type organic pigments, plastic moldings, coloring power, dispersibility, coupler recrystallization