Patent ID: 7217486
Filing Date: 2007-05-15
Classification: G03G

Abstract:
1. A toner obtained by a process comprising, in the following order: a step of externally adding negatively electrifiable silica fine particles to toner mother particles containing a binder resin and a colorant; a step of externally adding titanium oxide fine particles; a step of externally adding positively electrifiable silica fine particles; and a step of externally adding particles comprising a long chain fatty acid or a salt thereof, wherein the titanium oxide fine particles are rutile-anatase type titanium oxide fine particles having a long axis length of 10 to 30 nm, the isolation rate of the titanium oxide fine particles is 0.7% or less, and the isolation rate of the negatively electrifiable silica fine particles and the positively electrifiable silica fine particles is 0.43% or less.