Patent ID: 8808948

Claim:
A method of producing a dispersion composition comprising titanium black, a solvent and a dispersant including at least a first dispersant and a second dispersant, the method comprising: dispersing a mixed liquid containing the titanium black, the first dispersant and the solvent using a bead mill; and adding the second dispersant to the dispersed mixed liquid and dispersing the same using a bead mill, wherein at least a part of the dispersant has an acid value of 50 mgKOH/g or more, and wherein the first dispersant and the second dispersant are the same as or different from each other, and wherein each of the first dispersant and the second dispersant is a graft copolymer comprising at least one selected from the group consisting of structural units represented by the following Formulae (1) to (5): wherein, in Formulae (1) to (5), each of X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 independently represents a hydrogen atom or a monovalent organic group; each of Y 1 , Y 2 , Y 3 , Y 4 , and Y 5 independently represents a divalent linking group; each of Z 1 , Z 2 , and Z 5 independently represents a hydrogen atom or a monovalent organic group; each of Z 3 and Z 4 independently represents a hydrogen atom or an alkyl group having 5 to 24 carbon atoms; and each of n, m, p, q, and r independently represents an integer from 1 to 500.