Patent ID: 7442480

Claim:
A positively chargeable color toner comprising: a resin binder composed of a polyester and/or a hybrid resin in which a polyester component and a vinyl resin component are partially chemically bonded to each other; a compound represented by the formula (I): wherein each of R 1 to R 4 , which may be identical or different, is hydrogen atom, an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms; each of R 5 to R 12 , which may be identical or different, is a hydrogen atom, an alkyl group having 1 to 30 carbon atoms or an alkenyl group having 2 to 30 carbon atoms; and M is a hydrogen atom or a monovalent metal ion; lithium stearate; and at least one colorant selected from the group consisting of Pigment Yellow 185,Pigment Red 122, and Pigment Blue 16, wherein the compound represented by the formula (I) is contained in an amount of from 0.1 to 3 parts by weight based on 100 parts by weight of the resin binder, and wherein a total amount of the lithium stearate is from 0.5 to 3 parts by weight based on 100 parts by weight of the resin binder, and wherein the toner is prepared by a method comprising the steps of mixing raw materials comprising the resin binder, the compound represented by the formula (I), the lithium stearate, and the colorant, and melt-kneading the mixture.