Electrophotographic member, process cartridge, and electrophotographic apparatus
Provided is an electrophotographic member in which the increase in tackiness is small even in an environment of high temperature and high humidity. The electrophotographic member includes an electroconductive substrate and a surface layer, the surface layer contains resin including at least one of a urethane bond and an amide bond, the resin includes a cationic structure and an anionic structure in a molecule, and also includes a particular main-chain structure with hydrophobicity.
1. An electrophotographic member, comprising:
an electroconductive substrate; and
a surface layer, the surface layer containing resin including at least one of a urethane bond and an amide bond, and the resin having a cationic structure and an anionic structure in a molecule, wherein
the resin includes at least one structure selected from the group consisting of formulae (1), (2) and (4)
CH 2 —CR1=CH—CH 2 (1),
R2-O (2), and
where R1 represents a hydrogen atom or a methyl group, R2 represents an all group with 5 to 0.14 carbons, and R4 represents an alkylene group with 6 to 0.14 carbons, wherein
a ratio of the number of moles of cations and anions that are not covalently bound to the resin to the total number of moles of the cationic structure and the anionic structure that are held by a covalent bond, and cations and anions that are not covalently bound to the resin is 30 mol % or less.
2. The electrophotographic member according to claim 1 , wherein a ratio of the structure expressed by formulae (1), (2) and (4) to the entire mass of resin in the surface layer is 10 mass % or more.
3. The electrophotographic member according to claim 1 , wherein the cationic structure includes a nitrogen-containing aromatic ring.
4. An electrophotographic member, comprising:
an electroconductive substrate; and
a surface layer, the surface layer containing resin including at least one of a urethane bond and an amide bond, and the resin having a cationic structure and an anionic structure in a molecule, wherein
the resin includes at least one structure selected from the group consisting of formulae (1) to (4)
CH 2 —CR1=CH—CH 2 (1),
R 2 —O (2),
and
where R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group with 5 to 14 carbons, R3 represents an alkylene group with 5 to 14 carbons, and R4 represents an alkylene group with 6 to 14 carbons, and
a ratio of the number of moles of cations and anions that are not covalently bound to the resin to the total number of moles of the cationic structure and the anionic structure that are held by a covalent bond, and cations and anions that are not covalently bound to the resin is 30 mol % or less.
5. The electrophotographic member according to claim 4 , wherein a ratio of the structure expressed by formulae (1) to (4) to the entire mass of resin in the surface layer is 10 mass % or more.
6. The electrophotographic member according to claim 4 , wherein the cationic structure includes a nitrogen-containing aromatic ring.