Near-infrared reflective / transmissive azo pigment, process for producing near-infrared reflective / transmissive azo pigment, colorant composition using these azo pigments, coloring method of article and colored article

摘要

It can be used for paints, plastics, synthetic fibers, printing inks, stationery or image recording, coloring agents for image display, etc. In particular, when used as a thermal barrier paint, it is of a color of a dark color However, azo pigments with high near-infrared reflectance and transparency are provided, thereby providing colored articles having the above characteristics, and in the case of dark color systems and black color systems in particular, as printing inks in the security field as well , Useful articles are provided. Specifically, it is an azo pigment having a plurality of chromophores of an azomethine group and an azo group in the molecule, which is obtained by coupling reaction of a specific diazo component with a specific coupling component, wherein the diazo component is 3-(4-aminophenylimino)-1-oxo-4,5,6,7-tetrachloroisoindoline.