RED COLOR RESIST INK AND COLOR FILTER

摘要

PURPOSE: To provide a red color resist ink which can give a high level of lightness and chroma when used in color filters for liquid crystal displays. CONSTITUTION: In the red color resist ink obtained by dispersing a red pigment into a photosensitive resin composition, (D) a diketopyrrolopyrrole pigment and (E) a diketopyrrolopyrrole-sulfonic acid derivative or (A) a diketopyrrolopyrrole pigment whose surface has been treated with a diketopyrrolopyrrole-sulfonic acid derivative is used as the pigment component, and (B) a graft polymer obtained by reacting (a) a poly(lower alkyleneimine) or (b) a polyallylamine with (i) a polyester having a free carboxylic group, (ii) a polyamide or (iii) a polyesteramide to form an amide or a salt is used as the dispersing agent for dispersing this pigment component, and (C) a sulfonic acid derivative of an organic pigment is used as the crystal growth inhibitor.