Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method

1. An electrostatic charge image developing toner comprising:

a polyester resin that has a glass transition temperature of about 45° C. or higher and in which a proportion of repeating units derived from fumaric acid in repeating units derived from acid components is from 10 mol % and 40 mol % and a proportion of repeating units derived from alkenylsuccinic acid in the repeating units derived from acid components is 10 mol % or greater; and

a photopolymerization initiator,

wherein a content of the photopolymerization initiator is from about 0.5% by weight to about 10% by weight.

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

wherein the repeating unit derived from alkenylsuccinic acid is a repeating unit derived from dodecenylsuccinic acid.

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

wherein the photopolymerization initiator is at least one of an alkylphenone-based compound having a melting temperature of 60° C. or higher and an acylphosphine oxide-based compound having a melting temperature of 60° C. or higher.

4. The electrostatic charge image developing toner according to claim 2 ,

wherein the photopolymerization initiator is at least one of an alkylphenone-based compound having a melting temperature of 60° C. or higher and an acylphosphine oxide-based compound having a melting temperature of 60° C. or higher.

5. The electrostatic charge image developing toner according to claim 3 ,

wherein the alkylphenone-based compound is 2,2-dimethoxy-1,2-diphenylethan-1-one, and the acylphosphine oxide-based compound is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

6. The electrostatic charge image developing toner according to claim 4 ,

wherein the alkylphenone-based compound is 2,2-dimethoxy-1,2-diphenylethan-1-one, and the acylphosphine oxide-based compound is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

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

wherein the solubility of the photopolymerization initiator in water at 25° C. is less than 0.1% by weight.

8. The electrostatic charge image developing toner according to claim 3 ,

wherein the solubility of the photopolymerization initiator in water at 25° C. is less than 0.1% by weight.

9. An electrostatic charge image developer comprising:

the electrostatic charge image developing toner according to claim 1 .

10. The electrostatic charge image developer according to claim 9 ,

wherein the photopolymerization initiator of the electrostatic charge image developing toner is at least one of an alkylphenone-based compound having a melting temperature of 60° C. or higher and an acylphosphine oxide-based compound having a melting temperature of 60° C. or higher.

11. The electrostatic charge image developer according to claim 10 ,

wherein the alkylphenone-based compound is 2,2-dimethoxy-1,2-diphenylethan-1-one, and the acylphosphine oxide-based compound is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

12. A toner cartridge comprising:

a toner accommodation chamber,

wherein the toner accommodation chamber contains the electrostatic charge image developing toner according to claim 1 .

13. A process cartridge for an image forming apparatus comprising:

a developer holding member; and

a developer,

wherein the developer is the electrostatic charge image developer according to claim 9 .

14. An image forming apparatus comprising:

an image holding member;

a charging unit that charges the image holding member;

an electrostatic charge image forming unit that forms an electrostatic charge image on the charged image holding member;

a developing unit that develops the electrostatic charge image formed on the image holding member as a toner image by using the electrostatic charge image developer according to claim 9 ;

a transfer unit that transfers the toner image onto a transfer medium;

a fixing unit that fixes the toner image transferred onto the transfer medium on the transfer medium; and

a light irradiation unit that irradiates the toner image fixed on the transfer medium with light.

15. The image forming apparatus according to claim 14 ,

wherein the photopolymerization initiator of the electrostatic charge image developing toner in the electrostatic charge image developer is at least one of an alkylphenone-based compound having a melting temperature of 60° C. or higher and an acylphosphine oxide-based compound having a melting temperature of 60° C. or higher.

16. The image forming apparatus according to claim 14 ,

wherein the alkylphenone-based compound is 2,2-dimethoxy-1,2-diphenylethan-1-one, and the acylphosphine oxide-based compound is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

17. 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 formed on the surface of the image holding member as a toner image by using a developer;

transferring the developed toner image onto a transfer medium;

fixing the toner image transferred onto the transfer medium on the transfer medium; and

irradiating the toner image fixed on the transfer medium with light,

wherein the developer is the electrostatic charge image developer according to claim 9 .

18. The image forming method according to claim 17 ,

wherein the photopolymerization initiator of the electrostatic charge image developing toner in the electrostatic charge image developer is at least one of an alkylphenone-based compound having a melting temperature of 60° C. or higher and an acylphosphine oxide-based compound having a melting temperature of 60° C. or higher.

19. The image forming method according to claim 17 ,

wherein the alkylphenone-based compound is 2,2-dimethoxy-1,2-diphenylethan-1-one, and the acylphosphine oxide-based compound is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.