Patent ID: 7374847

Claim:
A toner for developing an electrostatic image, comprising: a resin binder and, not less than 0.1% by weight of an element which is provided in the form of a colorant pigment comprising copper phthalocyanine wherein the element is copper; wherein the toner has an isolation ratio of the element of not more than 10% and greater than 0.1% by number; where the isolation ratio of the element is determined by measuring light emission voltage caused by carbon and the element of particles present in the toner with a fluorescent X-ray analysis and defined as 100 times the number of particles exhibiting emission from the element but not exhibiting emission from carbon divided by the sum of the number of particles exhibiting emission from the element but not exhibiting emission from carbon and the number of particles exhibiting emission from the element and exhibiting emission from carbon, and wherein the colorant pigment has an average primary particle diameter of 10 to 200 nm, and the resin binder has an Mn of 1,000 to 100,000, an Mw of 2,000 to 1,000,000, and a molecular weight distribution (Mw/Mn) of 1.5 to 100.