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AssigneeSeiko Epson Corporation
InventorsNobuhiro Miyakawa, Takuya Kadota, Hidehiro Takano, Shinji Yasukawa, Masanao Kunugi
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A non-magnetic single-component toner 8 of the present invention has toner mother particles 8a, and external additives 12 comprising: two hydrophobic silicas 13, 14 of which particle diameters are different from each other, i.e. a mean primary particle diameter of 7 nm to 12 nm and a mean primary particle diameter of 40 nm to 50 nm, and a hydrophobic rutile/anatase type titanium oxide 15 having a spindle shape of which major axial diameter is in a range from 0.02 nm to 0.10 nm and the ratio of the major axial diameter to the minor axial diameter is set to be 2 to 8, wherein the external additives 12 adhere to the toner mother particles 8a. By the hydrophobic silicas 13, 14 having work function smaller than the work function of the toner mother particles 8a, the negative charging property is imparted to the toner mother particles 8a and the fluidity is also insured. On the other hand, by mixing and using hydrophobic rutile/anatase type titanium oxide particles 15 having work function larger than or equal to the work function of the toner mother particles 8a together with the hydrophobic silicas 13, 14, the non-magnetic single-component toner 8 is prevented from excessively charged. Therefore, the amount of fog toner on non-image portions is reduced, the transfer efficiency is further improved, the charging property is further stabilized, and the production of reverse transfer toner is further inhibited.
A non-magnetic single-component toner having toner mother particles and external additives externally adhering to said toner mother particles, wherein
A non-magnetic single-component toner prepared by adding at least a hydrophobic negatively chargeable external additive which has a negative charging property to toner mother particles and of which entire work function is set to be smaller than the work function of said toner mother particles, wherein
A non-magnetic single-component toner prepared by adding at least a hydrophobic negatively chargeable external additive having a negative charging property to toner mother particles, wherein
An image forming apparatus which has a predetermined gap between a latent image carrier and a development roller and is structured such that the development roller carries a non-magnetic single component toner comprising toner mother particles coated with external additives to develop an electrostatic latent image on said latent image carrier according to the non-contact development, wherein
An image forming apparatus which is structured such that an electrostatic latent image on a latent image carrier is developed with a non-magnetic single component toner comprising toner mother particles coated with external additives to form a toner image and the toner image is transferred to an intermediate transfer medium, wherein
A non-magnetic single-component toner prepared by adding at least a negatively chargeable external additive having a negative charging property to toner mother particles, wherein
A non-magnetic single-component toner having toner mother particles and external additives externally adhering to toner mother particles, wherein
A negatively chargeable dry toner, wherein aluminum oxide-silicon dioxide combined oxide particles, obtained by flame hydrolysis, and silicon dioxide particles are added to externally adhere to toner mother particles.
A negatively chargeable dry toner, wherein aluminum oxide-silicon dioxide combined oxide particles, obtained by flame hydrolysis, and silicon dioxide particles are added to externally adhere to toner mother particles, wherein said combined oxide particles has two work functions:
Dependencies are inferred from the claim text.