Electrophotographic photosensitive member, process cartridge, and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorsTomofumi Shimizu, Hideki Okada
Life of this patent
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Abstract
An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer containing at least a charge generating material, an electron transport material, a hole transport material, and a binder resin. The electron transport material includes a naphthoquinone derivative represented by general formula (1). An amount of triboelectric charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer (3) is at least +7 μC/g. In general formula (1), R11 and R12 are respectively the same as R11 and R12 described in the description.
Claims14
An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein
- the photosensitive layer is a single-layer photosensitive layer containing at least a charge generating material, an electron transport material, a hole transport material, and a binder resin,
- the electron transport material includes a naphthoquinone derivative represented by a general formula (1),
- an amount of triboelectric charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer is at least +7 μC/g,
- in the measurement of the amount of triboelectric charge of the calcium carbonate,
- (i) two of the photosensitive layers are prepared, one of the two photosensitive layers being a first photosensitive layer, another of the two photosensitive layers being a second photosensitive layer, the first photosensitive layer having a film thickness of 30 μm and being formed on a first overhead projector sheet, the second photosensitive layer having a film thickness of 30 μm and being formed on a second overhead projector sheet, the first overhead projector sheet and the second overhead projector sheet each having a length of 5 cm and a width of 5 cm,
- (ii) 0.007 g of the calcium carbonate is placed on the first photosensitive layer to form a calcium carbonate layer formed from the calcium carbonate, and the second photosensitive layer is placed on the calcium carbonate layer,
- (iii) the first photosensitive layer is rotated at a rotational speed of 60 rpm for 60 seconds while the second photosensitive layer is kept stationary in an environment at a temperature of 23° C. and a relative humidity of 50% to charge the calcium carbonate through friction between the calcium carbonate and each of the first photosensitive layer and the second photosensitive layer, and
- (iv) the charged calcium carbonate is sucked using a charge measuring device, and a total amount of electricity Q and a mass M of the sucked calcium carbonate are measured using the charge measuring device to calculate the amount of triboelectric charge of the calcium carbonate by an equation “amount of triboelectric charge=Q/M”,
- where in the general formula (1),
- R11 and R12 each represent, independently of each other, a chemical group selected from the group consisting of:
- an alkyl group having a carbon number of at least 1 and no greater than 8;
- an aryl group having a carbon number of at least 6 and no greater than 14 and optionally having a substituent;
- an aralkyl group having a carbon number of at least 7 and no greater than 20 and optionally having a substituent;
- and a cycloalkyl group having a carbon number of at least 3 and no greater than 10 and optionally having a substituent, and
- at least one of the chemical groups respectively represented by R11 and R12 is substituted with one or more halogen atoms.
Dependencies are inferred from the claim text.