Patent ID: 8394567

Claim:
A toner comprising: a binder resin; carbon black whose surface is treated with a diisocyanate compound or a triisocyanate compound including a plurality of isocyanate groups, a part of the plurality of isocyanate groups being unbonded; and a release agent having an acid value of about 5 mgKOH/g or higher and/or a hydroxyl value of about 5 mgKOH/g or higher, wherein the diisocyanate compound or the triisocyanate compound comprises at least one member selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenyl methane diisocyanate, polymeric diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, 3,3′-dimethyldiphenyl-4,4′-diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, trans cyclohexane 1,4-diisocyanate, diphenyl ether diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, 2,6-diisocyanatocaproic acid, tetramethyl-m-xylene diisocyanate, tetramethyl-p-xylene diisocyanate, trimethylhexamethylene diisocyanate, triphenylmethane triisocyanate, tris(isocyanatophenyl)thiophosphate, isocyanatoalkyl-2,6-diisocyanato capronate, 1,6,11-undecane triisocyanate, 1,8-diisocyanato-4-isocyanatomethyloctane, 1,3,6-hexamethylene triisocyanate, bicycloheptane triisocyanate, naphthalene-1,4-diisocyanate, diphenyl methane-4,4-diisocyanate, 3,3′-dimethoxy-4,4-biphenyl diisocyanate, 3,3′-dimethylphenylmethane-4,4′-diisocyanate, xylylene-1,4-diisocyanate, 4,4′-diphenylpropanediisocyanate, trimethylenediisocyanate, hexamethylenediisocyanate, propylene-1,2-diisocyanate, butylene-1,2-diisocyanate, cyclohexylene-1,2-diisocyanate, cyclohexylene-1,4-diisocyanate, 4,4′,4″-triphenylmethanetriisocyanate, and toluene-2,4,6-triisocyanate.