Patent ID: 6994942
Filing Date: 2006-02-07
Classification: G03G

Abstract:
1. A non-magnetic single-component toner prepared by adding at least external additives to toner mother particles, wherein said external additives comprise: at least a hydrophobic negatively chargeable silica which has a negative charging property relative to said toner mother particles, of which entire work function is set to be smaller than the work function of said toner mother particles, and which has a small mean primary particle diameter; a hydrophobic negatively chargeable silica which has a negative charging property relative to said toner mother particles, of which entire work function is set to be smaller than the work function of said toner mother particles, and which has a mean primary particle diameter larger than said small mean primary particle diameter; a hydrophobic rutile/anatase type titanium oxide which has a work function larger than or nearly equal to the work function of said toner mother particles and of which each particle is in a spindle shape; and a hydrophobic positively chargeable silica, surface-treated with a material having a positive charging property to said toner mother particles and of which entire work function is set to be smaller than the work function of said toner mother particles.