Electrophotographic photosensitive member, process cartridge, and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorsTomofumi Shimizu, Makoto Shishido
Life of this patent
Estimating the term…
Abstract
A single-layer photosensitive layer included in an electrophotographic photosensitive member contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4). The percentage of the number of repeats of the repeating unit represented by formula (3) relative to a total of the number of repeats of the repeating unit represented by formula (1) and the number of repeats of the repeating unit represented by formula (3) is greater than 0% and less than 20%.
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 binder resin,
- the binder resin includes a polyarylate resin,
- the polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4), and
- a percentage of the number of repeats of the repeating unit represented by the formula (3) relative to a total of the number of repeats of the repeating unit represented by the formula (1) and the number of repeats of the repeating unit represented by the formula (3) is greater than 0% and less than 20%,
- the repeating unit represented by the formula (1) is adjacent and bonded to the repeating unit represented by the formula (2), and/or the repeating unit represented by the formula (1) is adjacent and bonded to the repeating unit represented by the formula (4),
- the repeating unit represented by the formula (3) is adjacent and bonded to the repeating unit represented by the formula (2), and/or the repeating unit represented by the formula (3) is adjacent and bonded to the repeating unit represented by the formula (4),
- wherein the formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group and X represents a divalent group represented by formula (X1) or (X2), and
- in the formula (2), W represents a divalent group represented by formula (W1) or (W2),
- wherein the formula (X1), t represents an integer of at least 1 and no greater than 3 and represents a bond, and
- in the formula (X2), R3 and R4 each represent a hydrogen atom or an alkyl group with a carbon number of at least 1 and no greater than 4, R3 and R4 represent chemical groups different from each other, and * represents a bond,
- wherein the formulas (W1) and (W2), * represents a bond.
Dependencies are inferred from the claim text.