Electrophotographic photosensitive body and wet electrophotographic apparatus

A wet electrophotographic apparatus comprising;

• an electrophotographic photosensitive body having an image holding surface comprising
• a substrate having a conductive surface, and
• a photosensitive layer formed on the conductive surface of the substrate and changing in a charged state upon being irradiated with light, an exposed surface of the photosensitive layer constituting the image holding surface, C—F bonds and C—H bonds existing on the image holding surface for which the ratio of the number NCF of C—F bonds to the number Ncl of C—H bonds satisfies, on the image holding surface, a relationship represented by
• 2/100<NCF/NCH<300/100,
• a latent image formation unit forming a latent image on the image holding surface;
• a developing unit forming a developer image on the image holding surface having the latent image using a liquid developer;
• and
• a transfer unit transferring the developer image from the image holding surface onto a recording medium,
• wherein the photosensitive layer comprises a photoconductive layer formed on the conductive surface of the substrate and changing in a charged state upon being irradiated with light, and a surface layer formed on the photoconductive layer and having the exposed surface,
• wherein the exposed surface contains a fluorosilicone resin and a silicone resin.

An electrophotographic photosensitive body used in a wet electrophotographic apparatus, comprising:

• a substrate having a conductive surface, and
• a photosensitive layer formed on the conductive surface of the substrate and changing in a charged state upon being irradiated with light, the photosensitive layer having, on an exposed surface, C—F bonds and C—H bonds for which the ratio of the number NCF of C—F bonds to the number NCH of C—H bonds satisfies, on the exposed surface of the photosensitive layer, a relationship represented by
• 2/100<NCF/NCH<300/100,
• wherein the photosensitive layer comprises a photoconductive layer formed on the conductive surface of the substrate and a surface layer formed on the photoconductive layer and having the exposed surface, and
• wherein the ratio NCF/NCH on the exposed surface side of the surface layer is higher than the ratio NCF/NCH on a side of the surface layer at the interface between said surface layer and the photoconductive layer.

A wet electrophotographic apparatus comprising;

• an electrophotographic photosensitive body having an image holding surface comprising
• a substrate having a conductive surface, and
• a photosensitive layer formed on the conductive surface of the substrate and changing in a charged-state upon being irradiated with light, an exposed surface of the photosensitive layer constituting the image holding surface, C—F bonds and C—H bonds existing on the image holding surface for which the ratio of the number NCF of C—F bonds to the number NCH of C—H bonds satisfies, on the image holding surface, a relationship represented by
• 2/100<NCF/NCH<300/100,
• a latent image formation unit forming a latent image on the image holding surface;
• a developing unit forming a developer image on the image holding surface having the latent image using a liquid developer;
• and
• a transfer unit transferring the developer image from the image holding surface onto a recording medium,
• wherein the photosensitive layer comprises a photoconductive layer formed on the conductive surface of the substrate and a surface layer formed on the photoconductive layer and having the exposed surface, and
• wherein the ratio NCF/NCH on the exposed surface side of the surface layer is higher than the ratio NCF/NCH on a side of the surface layer at the interface between said surface layer and the photoconductive layer.