A coloring agent dispersion which contains a satisfactorily dispersed pigment, and results in a photosensitive resin composition capable of forming a cured film when mixed in the photosensitive resin composition; a photosensitive resin composition containing the coloring agent dispersion; a cured product of the composition; an organic EL element provided with the cured product; a method for forming a pattern using the composition; and a method for producing a photosensitive resin composition using the dispersion. In a coloring agent dispersion including a coloring agent which contains a pigment and a dispersant, a dispersant containing a silsesquioxane compound of a specific structure is used.

A pigment dispersion composition includes, a pigment; a dispersant; and a dispersion medium, wherein, the pigment includes a sulfo group or a sulfonic acid derivative group, and the dispersant is polyallylamine including an alkyl ester side chain. In one embodiment, the dispersion medium is acrylate or methacrylate. In one embodiment, a 1-octanol/water partition coefficient C Log P value, which is a predicted value, of the dispersion medium is in a range of 2.0 to 2.4.

A non-aqueous ink composition which, even when containing a perinone-based pigment, can be suitably used as a non-aqueous ink composition that is ejected by an inkjet method. The non-aqueous ink composition ejected by an inkjet method contains a pigment, a pigment dispersant, an organic solvent, and a resin, wherein the pigment contains a pigment A represented by formula (1), and the content of the pigment dispersant is smaller than the content of the pigment.

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(In formula (1), X1-X12 each independently represent a hydrogen atom, a halogen atom, an optionally branched alkyl group having 1 to 5 carbon atoms, or an aromatic hydrocarbon group optionally substituted with a hydrogen atom, a cyano group, a nitro group, an amino group, OH, COOH, COOM.sup.+, SO.sub.3H, SO.sub.3.sup.M.sup.+, a phthalimido group in which a hydrogen atom may be substituted, a phthalimidomethyl group, or a heterocyclic compound, and M.sup.+represents a cation.)

An electrophoretic medium comprises a plurality of a first type of charged particles in a non-polar liquid. Each of the plurality of the first type of charged particles has a core and a shell. The core comprises an organic pigment and a graphene oxide layer. The shell comprises an organosilane layer and a polymeric layer. The electrophoretic medium may be incorporated in a color electrophoretic device to improve its electro-optic performance.

Colorant particles are provided which comprise an anthocyanin-based colorant extract from red Sweet potato. The mean particle diameter (Dos) of said particles provides good suspension stability. An oil-based colorant composition comprising said particles is provided, as is a food product comprising the oil-based colorant composition.

An active energy ray-curable ink jet ink includes: a coloring pigment; a polymerizable compound; a polymer-type pigment dispersing agent having a glass transition temperature of 80 C. or higher; and a polymer-type pigment dispersing agent having a glass transition temperature of 0 C. or lower, in which, in a case where a concentration of the polymer-type pigment dispersing agent having a glass transition temperature of 80 C. or higher is indicated by M1 and a concentration of the polymer-type pigment dispersing agent having a glass transition temperature of 0 C. or lower is indicated by M2, 0.2M1/M2 is satisfied.