Toner and imaging method

Application Number: 00108779
Application Date: 2000.06.02
Publication Number: 1276542
Publication Date: 2000.12.13
Priority Information: 2000/2/21 JP 043662/2000; 1999/6/2 JP 154473/1999
International: G03G9/083;G03G13/00
Applicant(s) Name: Canon K. K.
Inventor(s) Name: Ito Masanori;Kuki Motoka;Takiguchi Katashi
Patent Agency Code: 11038
Patent Agent: chen jizhuang
Abstract A toner is formed of toner particles each comprising a binder resin and iron oxide particles dispersed therein. The toner particles are characterized by uniform but non-surface-exposed dispersion of the iron oxide particles within the toner particles as represented by (i) a carbon content (A) and an iron content (B) giving a ratio B/A < 0.001 at surfaces of the toner particles as measured by X-ray photoelectron spectroscopy, (ii) an average circularity of at least 0.970, and (iii) at least 50 % by number of toner particles satisfying D/C </= 0.02. Because of the above features, the toner can exhibit good long-term continuous image forming performances especially in an electrophotographic image forming process wherein some members contact the image-bearing member, e.g., for charging, developing and/or transfer.