Organic Pigments Used In UV Inks
The colorant in UV-cured inks is a pigment. The role of organic pigments in the film layer or ink can not only provide the desired color; but also add pigments to the ink coloring system, which involves the pigment dispersion and pigment colorant variety selection in the processing process. The application performance of inks is largely affected by the performance of pigments, such as light resistance, weather fastness, heat stability and organic solvent stability, ink film strength, fluidity and ink printability.
As a colorant, it should have high tinting strength, bright color, good stability, durability (light resistance, heat stability, chemical resistance), no migration, processability and good printability. Especially the flow performance in the connecting material medium.
Classic yellow spectrum pigments used in UV-curing inks are still mainly benzidine-based, with high tinting strength, bright color and transparency. Some Hansa-based yellow spectrum pigments can also be used in UV-curing inks; if used for color-adjusting photoresist inks for liquid crystal display (LCD) color filters (CF), heterocyclic organic pigments with excellent durability should be selected.
Given that classic organic pigments, such as lake pigments, pigment red 57:1, pigment red 49, etc., have high tinting strength, bright color and transparency, they are still the main coloring varieties; if used for UV-curing photoresist inks for liquid crystal color filters, organic pigments with excellent durability should be selected, such as C.I. Pigment Red 122, Pigment Red 254, etc.
finelandchem is an organic pigment manufacturer. The pigment varieties produced for UV light-curing inks include Pigment Yellow 13, Pigment Yellow 83, Pigment Red 57:1, Pigment Red 53:1, etc., which are bright in color, easy to disperse, and have excellent performance.