Patent ID: 8853717

Claim:
A dye dispersion liquid comprising a dye (A), a dispersant (B) and a solvent (C), the dye (A) being dispersed in the solvent (C) by the dispersant (B), wherein the dye (A) is a dye having a sulfonic acid group; the dispersant (B) is a graft copolymer having an amine value (b) of 30 mg KOH/g or more and comprising a monomer and a polymerizable oligomer as copolymerizable components, the monomer having a tertiary amine and an ethylenically unsaturated double bond and being represented by the following formula (I′), and the polymerizable oligomer comprising a polymer chain and at a terminal thereof a group having an ethylenically unsaturated double bond, the polymer chain having at least one of the repeating units represented by the following general formulae (II) and (III); the solvent (C) is a solvent having a solubility of the dye (A) of 0.2 (g/100 g solvent) or less at 23° C.; and a micelle is formed by an acid-base interaction between the tertiary amine of the dispersant (B) and the sulfonic acid group of the dye (A): wherein R 1 is a hydrogen atom or a methyl group; A is a direct bond or a divalent linking group; R 2 is one selected from the group consisting of an alkylene group having 1 to 8 carbon atoms and divalent organic groups represented by —[CH(R 5 )—CH(R 6 )—O] x —CH(R 5 )—CH(R 6 )— and —[CH 2 ) y —O] z —(CH 2 ) y —; each of R 3 and R 4 is independently a chain and/or cyclic hydrocarbon group which can be substituted, or R 3 and R 4 are bound to each other to form a cyclic structure; each of R 5 and R 6 is independently a hydrogen atom or a methyl group; “x” is an integer of 1 to 18; “y” is an integer of 1 to 5; and “z” is an integer of 1 to 18, and wherein R 7 is a hydrogen atom or a methyl group; R 8 is one selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a benzyl group a phenyl group, a biphenyl group, a cyano group and monovalent groups described by —[CH(R 9 )—CH(R 10 )—O] x —R 11 , —[(CH 2 ) y —O] z —R 11 , —[CO—(CH 2 ) y —O] z —R 11 , —CO—O—R 12 and —O—CO—R 13 ; each of R 9 and R 10 is independently a hydrogen atom or a methyl group; R 11 is one selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, and monovalent groups described by —CHO, —CH 2 CHO and —CH 2 COOR 14 ; R 12 is one selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a benzyl group, a phenyl group, a biphenyl group, a cyano group and monovalent groups described by —[CH(R 9 )—CH(R 10 )—O] x —R 11 , —[(CH 2 ) y —O] z —R 11 and —[CO—(CH 2 ) y —O] z —R 11 ; R 13 is an alkyl group having 1 to 18 carbon atoms; R 14 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; “m” is an integer of 1 to 5; “n” and “n” are each an integer of 5 to 200; “x” is an integer of 1 to 18; “y” is an integer of 1 to 5; and “z” is an integer of 1 to 18.