Electrostatic-image-developing toner, electrostatic image developer, image forming apparatus, and image forming method

1. An electrostatic-image-developing toner comprising:

a polyester resin;

two or more pigments that are (i) at least one azo-containing pigment having one or more azo groups in the molecule thereof, and (ii) at least one azo-free pigment;

a polyethylene wax; and

a polyolefin-polyvinyl-based graft copolymer,

wherein the electrostatic-image-developing toner satisfies the relationships represented by the following equations (1) and (2):

0.2 ≦wd/wp≦ 5.0  (1); and

0.05 ≦wp 1 /wp≦ 0.80  (2),

wherein

wp represents a total content (wt. %) of the pigments in the toner,

wd represents a content (wt. %) of the polyolefin-polyvinyl-based graft copolymer in the toner, and

wp1 represents a content (wt. %) of the azo-free pigment in the toner.

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

the azo-free pigment contains at least one yellow pigment selected from the group consisting of isoindoline pigments, isoindolinone pigments, quinophthalone pigments, and anthraquinone pigments.

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

the azo-free pigment contains at least one magenta pigment selected from the group consisting of quinacridone pigments, anthraquinone pigments, diketopyrrolopyrrole pigments, and perylene pigments.

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

a content of the azo-containing pigment is within a range of from about 0.5 wt. % to about 10 wt. %.

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

the content of the azo-free pigment is within a range of from about 0.1 wt. % to about 6 wt. %.

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

the azo-containing pigment is C.I. Pigment Yellow 155 and the azo-free pigment is C.I. Pigment Yellow 139.

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

the azo-containing pigment is C.I. Pigment Red 238 and the azo-free pigment is C.I. Pigment Red 122.

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

the polyethylene wax has an endothermic peak, in DSC measurement (differential scanning calorimetry), at from about 50° C. to about 160° C.

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

a content of the polyethylene wax is from about 0.5 wt. % to about 8 wt. % relative to the toner.

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

the polyolefin-polyvinyl-based graft copolymer has a Tg (transition glass temperature) of from about 40° C. to about 80° C.

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

the polyolefin-polyvinyl-based graft copolymer has a weight average molecular weight of from about 3,000 to about 50,000.

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

the polyester resin has a weight average molecular weight of from about 5,000 to about 100,000.

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

the polyester resin has a Tg (transition glass temperature) of from about 40° C. to about 80° C.

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

a diimmonium compound as an infrared absorbing material.

15. An electrostatic image developer comprising:

the electrostatic-image-developing toner as claimed in claim 1 ; and

a carrier.

16. An image forming method comprising:

charging a surface of an image holding member;

forming an electrostatic latent image on the surface of the image holding member;

developing the electrostatic latent image with a developer containing a toner to form a toner image;

transferring the toner image to a transfer-receiving material,

fixing the transferred toner image to the transfer-receiving material in accordance with an optical fixing system, and

cleaning the toner which has remained on the surface of the image holding member without being transferred,

wherein

a developer holding member that holds the developer has a peripheral speed of about 1,000 mm/s or greater,

the cleaning of the toner is performed by suctioning and collecting the toner, which has been removed using a cleaning blade, by utilizing an air stream, and

the developer is the electrostatic image developer as claimed in claim 15 .