Toner for electrostatic latent image development, electrostatic latent image developer, toner cartridge, process cartridge, and image forming apparatus
View Patent ↗A toner for electrostatic latent image development is disclosed. The toner for electrostatic latent image development includes toner particles, the toner particles includes a binder resin and a release agent, and the toner has a linear thermal expansion coefficient in accordance with JIS K 7197-1991 of from about 6×10 −5 /C.° to about 1×10 −3 /C.°. An electrostatic latent image developer, a toner cartridge, a process cartridge, and an image forming apparatus are also disclosed.
1. A toner for electrostatic latent image development comprising toner particles, the toner particles including:
a silicone resin,
a binder resin comprising a polyester resin containing an alcohol component and a polyhydric carboxylic acid component, the polyhydric carboxylic acid component comprising a component derived from terephthalic acid and fumaric acid, and the alcohol component comprising a component derived from ethylene glycol and a component derived from a member selected from the group consisting of an ethylene oxide adduct of bisphenol A, a propylene oxide adduct of bisphenol A, and both thereof,
a release agent,
a colorant, and
a C.I. Pigment Yellow 180, of which amount is smaller than an amount of the colorant, wherein, the toner has a linear thermal expansion coefficient in accordance with JIS K 7197-1991 of from 6×10 −5 /° C. to 1×10 −3 /° C.; wherein
the number-average particle size distribution index (GSDp) of the toner is in the range of from 1.20 to 1.27.
2. The toner for electrostatic latent image development according to claim 1 , wherein the toner particles have a shape factor (SF 1 ) of from about 145 to about 170.
3. The toner for electrostatic latent image development according to claim 1 , wherein the release agent includes polypropylene, polyethylene, or paraffin.
4. The toner for electrostatic latent image development according to claim 1 , wherein the toner particles further include a material having an effect of increasing viscosity in a high-temperature area in a content from about 0.1% by weight to about 10% by weight with respect to a total weight of the toner.
5. The toner for electrostatic latent image development according to claim 1 , wherein the toner particles further include a material having an effect of decreasing viscosity in a low-temperature area.
6. The toner for electrostatic latent image development according to claim 5 , wherein a content of the material having an effect of decreasing viscosity in a low-temperature area is from about 0.1% by weight to about 10% by weight with respect to a total weight of the toner.
7. The toner for electrostatic latent image development according to claim 5 , wherein the material having an effect of decreasing viscosity in a low-temperature area is rosin.
8. The toner for electrostatic latent image development according to claim 1 , wherein the toner further comprises, as an external additive, silica having a volume average particle diameter of 20 nm to 50 nm, and the silica is present in an amount of from about 0.8% by weight to about 3.0% by weight with respect to a total weight of the toner.
9. The toner for electrostatic latent image development according to claim 1 , wherein the binder resin has a glass transition temperature of from about 35° C. to about 50° C.
10. The toner for electrostatic latent image development according to claim 1 , wherein the toner has a volume average particle size distribution index (GSDv) of about 1.30 or less.
11. The toner for electrostatic latent image development according to claim 1 , wherein the toner particles are obtained by kneading a toner forming material including the binder resin and the release agent to obtain a kneaded product, and by pulverizing the kneaded product.
12. An electrostatic latent image developer comprising the toner for electrostatic latent image development according to claim 1 .
13. A toner cartridge which stores the toner for electrostatic latent image development according to claim 1 and is attachable to and detachable from an image forming apparatus.
14. A process cartridge which stores the electrostatic latent image developer according to claim 12 , comprises a developing unit that develops a latent image formed on a latent image holding member with the electrostatic latent image developer to form a toner image, and is attachable to and detachable from to an image forming apparatus.
15. An image forming apparatus comprising:
a latent image holding member;
a charging unit that charges the surface of the latent image holding member;
an electrostatic latent image forming unit that forms an electrostatic latent image on the surface of the electrostatic latent image holding member;
a developing unit that develops the electrostatic latent image with the electrostatic latent image developer of claim 12 to form a toner image;
a transfer unit that transfers the toner image to a recording medium; and
a fixing unit that fixes the toner image to the recording medium.
16. The toner for electrostatic latent image development according to claim 8 , wherein all the silica in the external additive has the volume average particle diameter of 20 nm to 50 nm.