Patent ID: 7470497

Claim:
A two-component developer comprising: a carrier for electrophotography in which a surface of at least a core material is coated with a resin; and a toner, wherein the coating resin contains a fluorine modified silicone resin and an aminosilane coupling agent, wherein the aminosilane coupling agent is included in a range of 5 to 40 weight parts with respect to 100 weight parts of the coating resin, wherein the fluorine modified silicone resin is a crosslinked fluorine modified silicone resin obtained by reacting an organic silicon compound containing a perfluoro alkyl group with polyorganosiloxane within a range of 3 to 20 weight parts with respect to 100 weight parts of the polyorganosiloxane, wherein the toner contains (1) a binding resin and (2) wax, and is charged negatively, wherein the binding resin includes a polyester resin in which at least one molecular weight maximum peak is in a region of 2×10 3 to 3×10 4 in a molecular weight distribution measured with gel permeation chromatography, in which the content of components in a high molecular weight region with a molecular weight of at least 3×10 4 is at least 5% with respect to the entire binding resin, in which the weight-average molecular weight ranges from 10,000 to 500,000, in which a Z-average molecular weight ranges from 20,000 to 5,000,000, in which a ratio between a weight-average molecular weight and a number-average molecular weight (weight-average molecular weight/number-average molecular weight) ranges from 3 to 150, in which a ratio between the Z-average molecular weight and the number-average molecular weight (Z-average molecular weight/number-average molecular weight) ranges from 10 to 2000, in which the melting temperature ranges from 80° C. to 150° C. measured by a ½ method with a capillary rheometer flow-tester of a constant pushing force type, in which a flow-beginning temperature ranges from 80° C. to 120° C., and in which the glass transition point of the resin ranges from 45° C. to 68° C., and wherein the polyester resin is obtained by a condensation polymerization between an alcohol component and a carboxylic acid component.