Method for producing electrophotographic photosensitive member
A method for producing an electrophotographic photosensitive member including: forming a photosensitive layer; and forming a protective layer, wherein the step of forming the photosensitive layer forms a photosensitive layer having an amount of residual solvent of a first solvent in the photosensitive layer of 0.05% to 2.50% and an amount of residual solvent of a second solvent in the photosensitive layer of 0.50% to 2.50%, and the step of forming the protective layer includes step (A) of forming a cured film and step (B) of forming the protective layer having wrinkle shapes, wherein, in step (A), the irradiated coating film is heated at a heating temperature lower than a boiling point of the first solvent and in step (B), the cured film is heated at a heating temperature higher than a boiling point of the first solvent.
1. A method for producing an electrophotographic photosensitive member comprising, in this order, a support, a charge generation layer, a charge transport layer, and a protective layer having an outer surface with wrinkles,
the method comprising the steps of:
forming the charge generation layer on the support;
forming the charge transport layer on the charge generation layer by forming a coating film for the charge transport layer using a coating solution comprising a first solvent, a second solvent having a boiling point higher than a boiling point of the first solvent, a charge transport substance and a resin, and then heating the coating film for the charge transport layer to form the charge transport layer, wherein an amount of residual first solvent in the charge transport layer is 0.05 to 2.50% by mass based on a total mass of the charge transport layer, and an amount of residual second solvent in the charge transport layer is 0.50 to 2.50% by mass based on a total mass of the charge transport layer, and
forming the protective layer on the charge transport layer, wherein
the protective layer is formed by
(A) forming a coating film for the protective layer using a coating solution comprising a compound having a chain polymerizable functional group, and irradiating, under a nitrogen atmosphere having an oxygen concentration of 10 ppm or less, the coating film to be cured for the protective layer with radiation, followed by heating, under a nitrogen atmosphere having an oxygen concentration of 10 ppm or less, the coating film to be cured at a temperature lower than the boiling point of the first solvent to form a cured film with a film thickness of 1.5 μm or less, and
(B) further heating, in the air, the cured film at a temperature higher than the boiling point of the first solvent to form the protective layer having the wrinkled outer surface.
2. The method for producing an electrophotographic photosensitive member according to claim 1 , wherein a ratio of the amount of residual second solvent to the amount of residual first solvent in the photosensitive layer is 1.00 to 15.00.
3. The method for producing an electrophotographic photosensitive member according to claim 1 , wherein the heating temperature in step (B) is lower than the boiling point of the second solvent.
4. The method for producing an electrophotographic photosensitive member according to claim 1 , wherein the boiling point of the first solvent is 90 to 150° C., and the boiling point of the second solvent is 153 to 230° C.
5. The method for producing an electrophotographic photosensitive member according to claim 3 , wherein the boiling point of the first solvent is 90 to 150° C., and the boiling point of the second solvent is 153 to 230° C.
6. The method for producing an electrophotographic photosensitive member according to claim 4 , wherein a difference between the boiling points of the second and first solvents is 40 to 100° C.
7. The method for producing an electrophotographic photosensitive member according to claim 5 , wherein a difference between the boiling points of the second and first solvents is 40 to 100° C.
8. The method for producing an electrophotographic photosensitive member according to claim 1 , wherein the radiation is electron beam.