Developer, developer cartridge, and image forming apparatus

1. A method of producing a developer comprising the steps of:

kneading at least a resin and a colorant;

reducing said kneaded resin and colorant to coarse powders;

adding an additive agent to said coarse powders;

reducing said coarse powders with said additive agent to fine powders; and

classifying said fine powders to provide said developer.

2. The method according to claim 1 , wherein said additive agent is selected from the group consisting of a silica, titanium, a titanium oxide, a clay, an alumina, a calcium carbonate, a methacrylic resin abradant, a melamine resin, and a silicon abradant.

3. A cartridge comprising said developer according to claim 1 .

4. An image forming apparatus, comprising:

an image holding device;

a charging device for charging said image holding device;

an exposing device for forming an electrostatic latent image on said charged image holding device;

a developing device for making said electrostatic latent image visible; and

said cartridge according to claim 3 .

5. A cartridge comprising said developer according to claim 2 .

6. An image forming apparatus, comprising:

an image holding device;

a charging device for charging said image holding device;

an exposing device for forming an electrostatic latent image on said charged image holding device;

a developing device for making said electrostatic latent image visible; and

said cartridge according to claim 5 .

7. The method according to claim 1 , further comprising a step of mixing the resin and the colorant to form a mixture before the step of kneading the resin and the colorant.

8. The method according to claim 7 , further comprising a step of melting the mixture at a temperature above a melting temperature of the resin before the step of reducing the resin and the colorant.

9. The method according to claim 1 , wherein said coarse powders have a first diameter, and said fine powders have a second diameter smaller than one tenth of the first diameter.