Organic photoreceptor, image forming apparatus, and process cartridge

1. An organic photoreceptor, comprising:

a conductive support;

a photosensitive layer provided on the conductive support; and

a protective layer provided on the photosensitive layer,

wherein the protective layer contains

a curable compound B having a functional group with a carbon-carbon double bond, and

alumina particles which contain 2 to 50 ppm of phosphorus atoms and are subjected to a surface treatment with a compound A having a reactive functional group, and

the compound A is a silane compound represented by Formula (1):

in Formula (1), R 3 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an aralkyl group having 1 to 10 carbon atoms, R 4 represents an organic group having a polymerizable double bond, X represents a halogen atom, an alcoxy group, an acyloxy group, an aminoxy group or a phenoxy group, and n represents an integer of 1 to 3, and

wherein the protective layer is a cured layer including a cured product formed by at least the compound A on the surface of the alumina particles and the curable compound B such that the compound A and the curable compound B bond with each other through a reaction between the polymerizable double bond of the compound A and the carbon-carbon double bond of the compound B in the cured product material.

2. The organic photoreceptor described in claim 1 , wherein the alumina particles have a number-based 50% particle size of 10 to 100 nm.

3. The organic photoreceptor described in claim 1 , wherein the alumina particles contain 5 to 30 ppm of sodium atoms.

4. The organic photoreceptor described in claim 1 , wherein the alumina particles have a crystal structure of one of γ-alumina, δ-alumina, θ-alumina, and α-alumina.

5. The organic photoreceptor described in claim 1 , wherein the alumina particles have a crystal structure of γ-alumina.

6. The organic photoreceptor described in claim 1 , wherein R 4 represents an organic group having an acryloyl group or a methacryloyl group.

7. The organic photoreceptor described in claim 1 , wherein the functional group of the curable compound B is an acryloyl group or a methacryloyl group.

8. The organic photoreceptor described in claim 1 , wherein the curable compound B has two or more of the functional group.

9. The organic photoreceptor described in claim 1 , wherein the curable compound B has a curable reactive group equivalent weight of 1000 or less.

10. An image forming apparatus, comprising:

the organic photoreceptor described in claim 1 ;

a charging section, an exposing section, and a developing section which are provided on the periphery of the organic photoreceptor,

wherein the image forming apparatus forms images repeatedly.

11. A process cartridge for use in an image forming apparatus, comprising:

the organic photoreceptor described in claim 1 ; and

at least one of a charging section, an exposing section, and a developing section which are provided on the periphery of the organic photoreceptor,

wherein the organic photoreceptor, and at least one of a charging section, an exposing section, and a developing section are made in a single body with the process cartridge, and the process cartridge is structured to be mounted detachably in the image forming apparatus.

12. The organic photoreceptor described in claim 1 , wherein the curable compound B contains at least one of a styrene type monomer, an acrylic type monomer, a methacrylic type monomer, a vinyltoluene type monomer, a vinyl acetate type monomer, and a N-vinyl-pyrrolidone type monomer.

13. The organic photoreceptor described in claim 1 , wherein the curable compound B is at least one of a monomer having a styrene group, a monomer having an acryloyl group, a monomer having a methacryloyl group, a monomer having a vinyltoluene group, a monomer having a vinyl acetate group, and a monomer having an N-vinyl-pyrrolidone group.