Patent ID: 7442480
Filing Date: 2008-10-28
Classification: G03G

Abstract:
1. 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; 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.