Positive charging single-layer electrophotographic photoconductor, image-forming apparatus and method for forming an image

1. A positive charging single-layer electrophotographic photoconductor configured to serve as an image-bearing member for use in an image-forming apparatus, comprising:

a photosensitive layer on a conductive base, the photosensitive layer including

a charge-generating material,

a hole-transport material,

an electron-transport material, and

a binder resin,

wherein the photosensitive layer includes a polysiloxane oil; and

wherein the polysiloxane oil is a dimethylpolysiloxane oil in an amount at least about 0.005% by mass and not greater than about 0.021% by mass with respect to the total mass of materials.

2. The positive charging single-layer electrophotographic photoconductor according to claim 1 ,

wherein the amount of dimethylpolysiloxane oil is at least 0.005% by mass and not greater than 0.0105% by mass with respect to the total mass of materials in the photosensitive layer.

3. The positive charging single-layer electrophotographic photoconductor according to claim 1 ,

wherein the dimethylpolysiloxane oil has a viscosity-average molecular weight of 1,000 to 10,000.

4. The positive charging single-layer electrophotographic photoconductor according to claim 1 ,

wherein the charge-generating material is metal-free phthalocyanine.

5. The positive charging single-layer electrophotographic photoconductor according to claim 1 , further comprising:

an intermediate layer provided between the conductive base and the photosensitive layer.

6. The positive charging single-layer electrophotographic photoconductor according to claim 1 , further comprising:

a protective layer provided on the photosensitive layer.

7. An image-forming apparatus comprising:

an image-bearing member;

a charging portion configured to charge a surface of the image-bearing member;

an exposure portion configured to expose the charged image-bearing member to form an electrostatic latent image on the surface of the image-bearing member;

a developing portion configured to develop the electrostatic latent image to form a toner image; and

a transfer portion configured to transfer the toner image from the image-bearing member to an object,

wherein the image-bearing member comprises the positive charging single-layer electrophotographic photoconductor according to claim 1 .

8. The image-forming apparatus according to claim 7 ,

wherein the charging portion is configured to apply a direct voltage by a contact charging method.

9. The image-forming apparatus according to claim 7 ,

wherein the charging portion includes a charging roller configured to come into contact with the surface of the positive charging single-layer electrophotographic photoconductor to charge the photosensitive layer.

10. The image-forming apparatus according to claim 9 ,

wherein the charging roller includes a resin layer comprising a resin,

wherein the resin contains at least one of silicone resins, urethane resins, and silicone-modified resins.

11. A method for forming an image, comprising:

charging a surface of a image-bearing member;

exposing the charged image-bearing member to form an electrostatic latent image on the surface of the image-bearing member;

developing the electrostatic latent image to form a toner image; and

transferring the toner image from the image-bearing member to an object,

wherein the image-bearing member comprises the positive charging single-layer electrophotographic photoconductor according to claim 1 .

12. A method for forming an image according to claim 11 ,

wherein in the charging of the surface of the image-bearing member, the surface of the image-bearing member is applied by a direct voltage with a contact charging method.

13. The method for forming an image according to claim 11 ,

wherein in the charging of the surface of the image-bearing member, a charging roller charges the surface of the image-bearing member by a contact charging method.