One-component toner and image forming method

An image forming apparatus comprising:

• a plurality of developing units configured to form a color image by using black and color nonmagnetic toners,
• wherein the developing unit comprises a controlling blade applied with a negative bias with respect to a developing roller,
• wherein the toner is a nonmagnetic one-component toner comprising:
• a colorant, and
• a binder resin,
• wherein metal oxide fine particles are fixed on a toner surface with an adhesion strength of 95% to 99%, the toner has a direct current resistance of 1E7 Ω·cm to 1E9 Ω·cm, and an electrostatic capacity of 1.0E-12F to 1.5E-11F.

A process cartridge comprising:

• a latent electrostatic image bearing member configured to bear a latent electrostatic image,
• a developing unit configured to develop the latent electrostatic image borne on the latent electrostatic image bearing member by using a toner so as to form a visible image, and comprises a controlling blade applied with a negative bias with respect to a developing roller,
• wherein the process cartridge is mounted to an image forming apparatus, and the image forming apparatus comprises:
• a plurality of the developing units configured to form a color image by using black and color nonmagnetic toners,
• wherein the toner is a nonmagnetic one-component toner comprising:
• a colorant, and
• a binder resin,
• wherein metal oxide fine particles are fixed on a toner surface with an adhesion strength of 95% to 99%, the toner has a direct current resistance of 1E7 Ω·cm to 1E9 Ω·cm, and an electrostatic capacity of 1.0E-12F to 1.5E-11F.

An image forming method comprising:

• forming a color image by using a plurality of developing units containing black and color nonmagnetic toners,
• wherein the developing unit comprises a controlling blade applied with a negative bias with respect to a developing roller,
• wherein the toner is a nonmagnetic one-component toner comprising:
• a colorant, and
• a binder resin,
• wherein metal oxide fine particles are fixed on a toner surface with an adhesion strength of 95% to 99%, and the toner has a direct current resistance of 1E7 Ω·cm to 1E9 Ω·cm, and an electrostatic capacity of 1.0E-12F to 1.5E-11F.