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 (3c) containing a charge generating material and an electron transport material. The electron transport material includes a compound represented by general formula (1) shown below. An amount of charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer (3) is at least +7.0 μC/g. In general formula (1), R1 and R2 each represent, independently of each other, a halogen atom, for example. Further, m, n, and Y are as described in the description.
Claims15
An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein
- the photosensitive layer is a photosensitive layer of a single-layer structure containing a charge generating material and an electron transport material,
- the electron transport material includes a compound represented by a general formula (1) shown below,
- an amount of charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer is at least +7.0 μC/g, and
- in the measurement of the amount of the 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 and second photosensitive layers each having a circular shape with a diameter of 3 cm,
- (ii) 0.007 g of the calcium carbonate is applied over the first photosensitive layer to obtain a calcium carbonate layer made 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 fixed in an environment at a temperature of 23° C. and a relative humidity of 50% to charge the calcium carbonate contained in the calcium carbonate layer 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 electric amount Q and a mass M of the sucked calcium carbonate are measured using the charge measuring device to calculate the amount of the charge of the calcium carbonate according to an expression Q/M,
- where in the general formula (1),
- R1 and R2 each represent, independently of each other:
- a halogen atom;
- an alkyl group having a carbon number of at least 1 and no greater than 8 and having at least one halogen atom;
- an aryl group having a carbon number of at least 6 and no greater than 14, having at least one halogen atom, and optionally having an alkyl group having a carbon number of at least 1 and no greater than 6;
- an aralkyl group having a carbon number of at least 7 and no greater than 20 and having at least one halogen atom;
- or
- a cycloalkyl group having a carbon number of at least 3 and no greater than 10 and having at least one halogen atom,
- m and n each represent, independently of each other, an integer of at least 0 and no greater than 5, with the proviso that at least one of the integers represented by m and n is not 0, and
- Y represents —CO—O—CH2—, —CO—, or —CO—O—.
Dependencies are inferred from the claim text.