Carrier, developer using the carrier, and developing device, image forming method, image forming apparatus and process cartridge using the developer
A carrier for use in a two component developer for developing an electrostatic latent image is provided. The carrier includes a particulate core material; and a cover layer located on a surface of the core material and including a silicone resin and barium sulfate. The cover layer includes Ba and Si at an atomic ratio of from 0.01 to 0.08 as determined by X-ray photoelectron spectroscopy.
1. A carrier for use in a two component developer for developing an electrostatic latent image, comprising:
a particulate core material; and
a cover layer located on a surface of the core material and including a silicone resin and barium sulfate, wherein the cover layer includes Ba and Si at an atomic ratio of from 0.01 to 0.08 as determined by X-ray photoelectron spectroscopy.
2. The carrier according to claim 1 , wherein the cover layer further includes tin oxide.
3. The carrier according to claim 1 , wherein the carrier has a logarithmic volume resistivity of from 10 log(Ω·cm) to 15 log(Ω·cm).
4. The carrier according to claim 1 , wherein the carrier has a volume average particle diameter of from 15 μm to 40 μm.
5. A two component developer for developing an electrostatic latent image, comprising:
the carrier according to claim 1 ; and
a toner including at least a binder resin and a colorant.
6. The two component developer according to claim 5 , used as a supplementary developer, wherein a weight ratio (C/T) of the carrier (C) to the toner (T) is from ½ to 1/50.
7. An image forming method comprising:
forming an electrostatic latent image on an image bearing member;
developing the electrostatic latent image with the two component developer according to claim 5 to form a toner image on the image bearing member;
transferring the toner image to a recording material; and
fixing the toner image to the recording material.