Toner

A toner comprising toner particles, each of which contains a binder resin, a pigment and an azo compound and manufactured in an aqueous medium by the manufacturing method of (i) or (ii) below:

• (i) dispersing and granulating a polymerizable monomer composition containing a polymerizable monomer, a pigment and an azo compound in an aqueous medium, and polymerizing the polymerizable monomer contained in granulated particles to thereby produce a toner;
• (ii) dissolving or dispersing a toner composition containing a binder resin, a pigment and an azo compound in an organic solvent, dispersing and granulating the resulting mixed solution in an aqueous medium, and removing the organic solvent contained in granulated particles to thereby produce a toner,
• wherein the pigment is at least one selected from the group consisting of Carbon black, C.I. Pigment Yellow 3, 7, 10, 12, 13, 14, 15, 17, 23, 24, 60, 62, 75, 83, 94, 95, 99, 100, 101, 104, 108, 109, 110, 111, 117, 123, 129, 138, 139, 147, 148, 150, 166, 168, 169, 177, 179, 181, 183, 185, 191:1, 191, 192, 193and 199, C.I. Pigment Red 6, 7, 48:3, 48:4, 81:1, 122, 150, 169, 177, 184, 202, 206, and 254, C.I. Pigment Violet 19, C.I. Pigment Blue 1, 7, 15, 15:1, 15:2, 15:3, 15:4, 60, 62 and 66,
• wherein the azo compound contains a polymer component, and the part other than the polymer component is represented by General Formula (1) below:
• (in Formula (1), any one of R1, R2 and Ar is bound to the polymer component with a single bond or a linking group;
• R1 not bound to the polymer component represents a monovalent group selected from the group consisting of an alkyl group, phenyl group, OR5 group and NR6R7 group wherein R5 to R7 each independently represent a hydrogen atom, alkyl group, phenyl group or aralkyl group),
• R1, which is bound to the polymer component with a single bond or a linking group, represents a divalent group of which a hydrogen atom is removed from the corresponding monovalent group of R1, and the linking group is a divalent linking group selected from the group consisting of an amide group, an ester group, a urethane group, a urea group, an alkylene group, a phenylene group, —O—, —NR3— and —NHCH(CH2OH)CH2—, wherein R3 represents a hydrogen atom, alkyl group, phenyl group or aralkyl group;
• R2 not bound to the polymer component represents a monovalent group selected from the group consisting of an alkyl group, phenyl group, and NR10R11 group wherein R10 and R11 each independently represent a hydrogen atom, alkyl group, phenyl group or aralkyl group,
• R2, which is bound to the polymer component with a single bond or a linking group, represents a divalent group of which a hydrogen atom is removed from the corresponding monovalent group of R2, and the linking group is a divalent linking group selected from the group consisting of an alkylene group, a phenylene group, —O—, —NR8—, —NHCOC(CH3)2— and —NHCH(CH2OH)CH2— wherein R8 represents a hydrogen atom, alkyl group, phenyl group or aralkyl group;
• Ar not bound to the polymer component represents an aryl group,
• Ar, which is bound to the polymer component with a single bond or a linking group, represents a divalent group of which a hydrogen atom is removed from the corresponding aryl group, and the linking group is a divalent linking group selected from the group consisting of an amide group, an ester group, a urethane group, a urea group, an alkylene group, a phenylene group, —O—, —NR3— and —NHCH(CH2OH)CH2— wherein R3 represents a hydrogen atom, alkyl group, phenyl group or aralkyl group and
• an absolute value of a difference in zeta potential between the binder resin and the azo compound is 25 mV or less.