Patent ID: 8084178
Filing Date: 2011-12-27
Classification: G03G

Abstract:
1. A non-magnetic toner comprising: toner particles; and an inorganic fine powder, wherein: each of the toner particles contains at least a binder resin, a colorant, a polyester resin, and a wax component; the binder resin is a styrene-acrylic copolymer or a styrene-methacrylic copolymer; a storage elastic modulus at 110° C. (G′ a storage elastic modulus at 150° C. (G′ in a differential curve obtained by differentiating a temperature-storage elastic modulus curve in which an axis of abscissa indicates a temperature and an axis of ordinate indicates a common logarithm LogG′ of a storage elastic modulus G′ with respect to a temperature, when a temperature at which the differential curve shows a minimum value in a temperature region of 60 to 130° C. is denoted by T a straight line having a largest gradient out of straight lines each of which is drawn to connect a straight line having a smallest gradient out of straight lines each of which is drawn to connect [where “b” represents an integer of 0 or more] is denoted by B, and a straight line having a largest gradient out of straight lines each of which is drawn to connect [where “c” represents an integer larger than “a value “b” providing the straight line B”] is denoted by C, a temperature width ΔT a temperature T the toner particles are obtained by dispersing a polymerizable monomer composition containing vinyl-based polymerizable monomers, divinylbenzene, the colorant, the wax component, the polyester resin, and a low-molecular weight polymer into an aqueous medium, granulating the dispersed polymerizable monomer composition, and polymerizing the vinyl-based polymerizable monomers and divinylbenzene in granulated particles; the low-molecular weight polymer has a weight average molecular weight (Mw) measured by means of gel permeation chromatography (GPC) in a range of 2000 to 5000; and the wax component has a maximum heat absorption peak in a temperature range of 60 to 120° C. measured by using a differential scanning calorimeter (DSC).