Electrophotographic photoreceptor, process cartridge, and image forming apparatus

1. An electrophotographic photoreceptor comprising:

a conductive substrate;

a photosensitive layer that is provided on the conductive substrate; and

a surface layer that is provided on the photosensitive layer,

wherein the surface layer is formed of a cured film of a composition including

a guanamine compound;

a first reactive charge transport material having a hydroxyl group and a second reactive charge transport material having methoxy groups; and

a catalyst,

wherein the cured film has an elastic deformation ratio R satisfying the following Expression (1):

0.40 ≦R≦ 0.51  (1),

and

a blending ratio of the catalyst is from 0.1% by weight to 50% by weight with respect to all of the solid contents of the surface layer excluding any fluorine resin particles present in the composition and any fluorinated alkyl group-containing copolymers present in the composition.

2. The electrophotographic photoreceptor according to claim 1 , wherein a ratio of the first reactive charge transport material to the second reactive charge transport material is from 2 to 20 in terms of weight ratio.

3. The electrophotographic photoreceptor according to claim 1 ,

wherein the photoreceptor satisfies the following Expression (2):

3.8 ≦M 1≦5  (2)

wherein M1 represents a Young's modulus (GPa) of the surface layer when the surface layer is laminated.

4. The electrophotographic photoreceptor according to claim 1 ,

wherein the photoreceptor satisfies the following Expression (3):

M 1≦1.1 ×M 2  (3)

wherein M1 represents a Young's modulus (GPa) of the surface layer when the surface layer is laminated, and M2 represents a Young's modulus (GPa) of the surface layer when the surface layer has been peeled off.

5. The electrophotographic photoreceptor according to claim 1 ,

wherein the elastic deformation ratio R satisfies the following Expression (1-2):

0.43 ≦R≦ 0.50  (1-2).

6. The electrophotographic photoreceptor according to claim 1 ,

wherein the elastic deformation ratio R satisfies the following Expression (1-3):

0.45 ≦R≦ 0.50  (1-3).

7. The electrophotographic photoreceptor according to claim 1 ,

wherein the photoreceptor satisfies the following Expression (2-3):

4.0 ≦M 1≦4.5  (2-3)

wherein M1 represents a Young's modulus (GPa) of the surface layer when the surface layer is laminated.

8. The electrophotographic photoreceptor according to claim 1 , wherein the photoreceptor satisfies the following Expression (3-2):

0.9 ×M 2 ≦M 1 ≦M 2  (3-2)

wherein M1 represents a Young's modulus (GPa) of the surface layer when the surface layer is laminated, and M2 represents a Young's modulus (GPa) of the surface layer when the surface layer has been peeled off.

9. The electrophotographic photoreceptor according to claim 1 , wherein the first reactive charge transport material has a plurality of hydroxyl groups.

10. The electrophotographic photoreceptor according to claim 1 ,

wherein the photoreceptor further contains fluorine resin particles.

11. The electrophotographic photoreceptor according to claim 10 , wherein an average primary particle diameter of the fluorine resin particles is from 0.05 μm to 2 μm.

12. The electrophotographic photoreceptor according to claim 10 , wherein the fluorine resin is selected from polytetrafluoroethylene, a perfluoroalkoxy fluorine resin, polychlorotrifluoroethylene, polyvinylidene fluoride, polydichlorodifluoroethylene, tetrafluoroethylene-perfluoroalkylvinyl ether copolymers, tetrafluororoethylene-hexafluoropropylene copolymers, tetrafluoroethylene-ethylene copolymers, and tatrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymers.

13. An image forming apparatus comprising:

an electrophotographic photoreceptor;

a charging unit that charges a surface of the electrophotographic photoreceptor;

a latent image forming unit that forms an electrostatic latent image on a charged surface of the electrophotographic photoreceptor;

a developing unit that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a toner to form a toner image; and

a transfer unit that transfers the toner image formed on the surface of the electrophotographic photoreceptor onto a recording medium,

wherein the electrophotographic photoreceptor is the electrophotographic photoreceptor according to claim 1 .

14. The image forming apparatus according to claim 13 , wherein in the photoreceptor, a ratio of the first reactive charge transport material to the second reactive charge transport material is from 2 to 20 in terms of weight ratio.

15. A process cartridge comprising:

an electrophotographic photoreceptor; and

a cleaning unit that cleans the electrophotographic photoreceptor,

wherein the electrophotographic photoreceptor is the electrophotographic photoreceptor according to claim 1 .

16. The process cartridge according to claim 15 , wherein in the photoreceptor, a ratio of the first reactive charge transport material to the second reactive charge transport material is from 2 to 20 in terms of weight ratio.

17. The electrophotographic photoreceptor according to claim 1 , wherein the blending ratio of the catalyst is from 10% by weight to 30% by weight with respect to all of the solid contents of the surface layer excluding the fluorine resin particles present in the composition and the fluorinated alkyl group-containing copolymers present in the composition.