Electrophotographic photosensitive member, process cartridge, and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorsTomofumi SHIMIZU, Makoto SHISHIDO, Kazuaki EZURE, Kiichiro OJI, Katsuya TAKANO
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Abstract
An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer and contains a charge generating material, a hole transport material, an electron transport material, and a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), and (3). A ratio n1/n2 of the number n1 of repeats of the repeating unit represented by formula (1) to the number n2 of repeats of the repeating unit represented by formula (2) is at least 1.0.
Claims20
An electrophotographic photosensitive member comprising:
- A conductive substrate and a photosensitive layer, wherein
- The photosensitive layer is a single layer,
- The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a polyarylate resin,
- the polyarylate resin includes a repeating unit represented by formula (1), a repeating unit represented by formula (2), and a repeating unit represented by formula (3), and
- a ratio n1/n2 of a number m of repeats of the repeating unit represented by the formula (1) to a number n2 of repeats of the repeating unit represented by the formula (2) is at least 1.0,
- where in the formula (1):
- R1 and R2 each represent a methyl group, and R3 and R4 are bonded to each other to represent a cycloalkylidene group with a carbon number of 5 or 6;
- or
- R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group, R3 represents a methyl group, and R4 represents a hydrogen atom or an alkyl group with a carbon number of 2 or 3.
Dependencies are inferred from the claim text.