Electrophotographic photosensitive member, production method therefor, process cartridge, and electrophotographic image-forming apparatus
Provided is an electrophotographic photosensitive member that suppresses image smearing at the time of its repeated use, and expresses satisfactory wear resistance and electric characteristics. The electrophotographic photosensitive member includes a support and a photosensitive layer in the stated order, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a chain-polymerizable functional group and a specific compound having maleimide groups.
1. An electrophotographic photosensitive member comprising in this order:
a support; and
a photosensitive layer, wherein
a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a chain-polymerizable functional group and a compound represented by formula (1)
where X represents a divalent group obtained by removing two hydrogen atoms from a hydrocarbon having 2 to 18 carbon atoms.
2. The electrophotographic photosensitive member according to claim 1 , wherein the hydrocarbon has 6 to 18 carbon atoms.
3. The electrophotographic photosensitive member according to claim 1 , wherein the hydrocarbon comprises a saturated hydrocarbon.
4. The electrophotographic photosensitive member according to claim 3 , wherein the saturated hydrocarbon comprises a chain saturated hydrocarbon.
5. The electrophotographic photosensitive member according to claim 4 , wherein the chain saturated hydrocarbon has 6 to 12 carbon atoms.
6. The electrophotographic photosensitive member according to claim 5 , wherein the compound represented by formula (1) comprises a compound represented by formula (2)
where n represents an integer of 6 to 12.
7. The electrophotographic photosensitive member according to claim 1 , wherein the chain-polymerizable functional group is selected from an acryloyloxy group and a methacryloyloxy group.
8. The electrophotographic photosensitive member according to claim 1 , wherein the hole-transportable compound comprises two of the chain-polymerizable functional groups.
9. The electrophotographic photosensitive member according to claim 1 , wherein 0.05≤(Wb/Mb)/{(Wa/Ma)+(Wb/Mb)}≤0.50, where Wa and Ma respectively represent a mass and a molecular weight, of the hole-transportable compound contained in the copolymer, and Wb and Mb respectively represent a mass and a molecular weight of the compound represented by formula (1) contained in the copolymer.
10. A method for producing an electrophotographic photosensitive member comprising in this order:
providing a support;
forming a photosensitive layer; and
forming a surface layer, wherein
forming the surface layer comprises
preparing a coating liquid for the surface layer containing a hole-transportable compound having a chain-polymerizable functional group and a compound represented by formula (1)
where X represents a divalent group obtained by removing two hydrogen atoms from a hydrocarbon having 2 to 18 carbon atoms,
forming a coat of the coating liquid, and
curing the coat to form the surface layer.
11. The method for producing an electrophotographic photosensitive member according to claim 10 , wherein the compound represented by formula (1) comprises a compound represented by formula (2)
where n represents an integer of 6 to 12.
12. The method for producing an electrophotographic photosensitive member according to claim 10 , wherein 0.05≤(Wb/Mb)/{(Wa/Ma)+(Wb/Mb)}≤0.50, where Wa and Ma respectively represent a mass and a molecular weight, of the hole-transportable compound contained in the coating liquid, and Wb and Mb respectively represent a mass and a molecular weight of the compound represented by formula (1) contained in the coating liquid.
13. A process cartridge comprising:
an electrophotographic photosensitive member including a support and a photosensitive layer in the stated order;
at least one unit selected from the group consisting of a charging unit, a developing unit, and a cleaning unit; and
the process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, and being removably mounted onto a main body of an electrophotographic image-forming apparatus, wherein
a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a chain-polymerizable functional group and a compound represented by formula (1)
where X represents a divalent group obtained by removing two hydrogen atoms from a hydrocarbon having 2 to 18 carbon atoms.
14. An electrophotographic image-forming apparatus comprising:
an electrophotographic photosensitive member including a support and a photosensitive layer in the stated order; and
at least one unit selected from the group consisting of a charging unit, an exposing unit, a developing unit, and a transferring unit, wherein
a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a chain-polymerizable functional group and a compound represented by formula (1)
where X represents a divalent group obtained by removing two hydrogen atoms from a hydrocarbon having 2 to 18 carbon atoms.