Patent ID: 7049040

Claim:
A toner for developing an electrostatically charged image, the toner comprising (a) a binder resin comprised of at least one polyolefin resin having a cyclic structure, wherein the polyolefin resin having a cyclic structure comprises: (i) a first resin or a first resin fraction with a number average molecular weight (Mn), as measured by GPC, of less than 7,500, and (ii) a second resin or a second resin fraction with a number average molecular weight (Mn) of 7,500 or more, Mw of 15,000 or more, a heat distortion temperature as measured by the DIN 53461-B method of 70° C. or higher and an intrinsic viscosity of 0.25 dl/g or more; (b) a colorant; (c) a function imparting agent; and (d) a charge control agent and wherein said first resin or said first resin fraction and said second resin or said second resin fraction must be present and said second resin or second resin fraction is contained in a proportion of less than 50% by weight based on the entire binder resin.