Electrostatic-image-developing toner and preparation process thereof, electrostatic image developer, toner cartridge, process cartridge, image forming method and image forming apparatus

1. An electrostatic-image-developing toner, comprising:

a binder resin; and

a yellow pigment in an amount of from about 5 to about 50 ppm.

2. The electrostatic-image-developing toner according to claim 1 ,

wherein the binder resin contains a polyester resin.

3. The electrostatic-image-developing toner according to claim 1 ,

wherein the binder resin contains a polyester resin in an amount of from about 70 to about 100 wt. %.

4. The electrostatic-image-developing toner according to claim 1 ,

wherein the binder resin contains a crystalline polyester resin in an amount of from about 5 to about 30 wt. %.

5. The electrostatic-image-developing toner according to claim 2 ,

wherein the polyester resin contains a non-crystalline polyester resin having a bisphenol structure.

6. The electrostatic-image-developing toner according to claim 1 ,

wherein the yellow pigment is selected from the group consisting of monoazo pigments, disazo pigments and benzimidazolone disazo pigments.

7. The electrostatic-image-developing toner according to claim 1 ,

wherein the yellow pigment is selected from the group consisting of C.I. Pigment Yellow 74, C.I. Pigment Yellow 93 and C.I. Pigment Yellow 180.

8. The electrostatic-image-developing toner according to claim 1 , further comprising:

a releasing agent that contains carnauba wax.

9. A process for preparing the electrostatic-image-developing toner according to claim 1 , the process comprising:

in a dispersion in which binder resin particles and yellow pigment particles are dispersed, aggregating the binder resin particles and the yellow pigment particles to obtain aggregated particles; and

fusing the aggregated particles by heating.

10. An electrostatic image developer, comprising:

the electrostatic-image-developing toner according to claim 1 ; and

a carrier.

11. A toner cartridge, comprising:

the electrostatic-image-developing toner according to claim 1 .

12. A process cartridge, comprising:

a developing unit that houses therein the electrostatic image developer according to claim 10 and develops an electrostatic latent image formed on a surface of a latent image support with the electrostatic image developer to form a toner image; and

at least one unit selected from the group consisting of the latent image support, a charging unit that charges the surface of the latent image support and a cleaning unit that removes a toner which has remained on the surface of the latent image support,

wherein the process cartridge is detachably mounted on an image forming apparatus.

13. An image forming method, comprising:

charging a latent image support;

forming an electrostatic latent image on a surface of the latent image support;

developing the electrostatic latent image formed on the surface of the latent image support with a toner to form a toner image;

transferring the toner image formed on the surface of the latent image support to a surface of a transfer-receiving material;

fixing the toner image; and

detecting a concentration of the toner from a color difference between a reference toner image and the latent image support containing a phthalocyanine pigment and controlling a supply amount of the toner to the latent image support,

wherein the toner is the electrostatic-image-developing toner according to claim 1 .

14. An image forming apparatus, comprising:

a latent image support;

a charging unit that charges the latent image support;

an exposing unit that exposes the charged latent image support to form an electrostatic latent image on the latent image support;

a developing unit that develops the electrostatic latent image with a developer to form a toner image;

a transferring unit that transfers the toner image from the latent image support to a transfer-receiving material;

a fixing unit that fixes the toner image; and

an image density controlling unit that detects a concentration of a toner from a color difference between a reference toner image and the latent image support containing a phthalocyanine pigment and controls a supply amount of the toner to the latent image support,

wherein the electrostatic-image-developing toner according to claim 1 is used as the developer.

15. The image forming apparatus according to claim 14 ,

wherein the transferring unit includes:

a primary transferring unit that transfers the toner image to an intermediate receiving material; and

a secondary transferring unit that transfers the toner image from the intermediate receiving material to a recording medium.