| 主权项 |
1. An electrophotographic photosensitive member comprising an electrically conductive support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer, the photosensitive layer comprising a charge generation material and a hole transport material,
wherein the undercoat layer comprises a polymer having a repeating structural unit represented by the following formula (1) with the proviso that a polymer further having a repeating structural unit represented by the following formula (2) is excluded from the polymer having the repeating structural unit represented by the following formula (1):
[Formula 1]Z1-A1-Z2-W1-B1-W2 (1)Z3-A2-Z4-W3-B2-W4 (2) wherein, in the formulae (1) and (2), Z1 to Z4 each independently represents a single bond, an alkylene group, an arylene group, an arylene group substituted with an alkyl group, or an aralkylene group; W1 to W4 each independently represents a single bond, a urethane bond, or a urea bond; B1 represents an arylene group substituted with a carboxyl group or a sulfo group, an arylene group substituted with a carboxyl group and an alkyl group, or an alkylene group substituted with a carboxyl group or a sulfo group; B2 represents an arylene group, an alkylene group, an aralkylene group, an arylene group substituted with an alkyl group, a halogen atom, a cyano group or a nitro group, an alkylene group substituted with a halogen atom, a cyano group or a nitro group, an aralkylene group substituted with an alkyl group, a halogen atom, a cyano group or a nitro group, an arylene group interrupted by ether or sulfonyl, or an alkylene group interrupted by ether; and A1 and A2 each independently represents a divalent group represented by any of the following formulae (A-1) to (A-8): wherein, in the formula (A-1), R101 to R104 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, or a bonding site; and R105 and R106 each independently represents an aryl group, an aryl group substituted with an alkyl group or a halogen atom, an alkyl group, or a bonding site; provided that two of R101 to R106 are each a bonding site; in the formula (A-2), R201 to R208 independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, or a bonding site; and R209 and R210 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with an alkyl group or a halogen atom, an alkyl group, or a bonding site; provided that two of R201 to R210 are each a bonding site; in the formula (A-3), R301 to R308 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, or a bonding site; R309 represents an oxygen atom, or a dicyanomethylene group; R310 and R311 each independently represents a carbon atom, or a nitrogen atom; in the case where R310 is a nitrogen atom, R304 is not present, and in the case where R311 is a nitrogen atom, R305 is not present; provided that two of R301 to R308 are each a bonding site; in the formula (A-4), R401 to R406 independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, or a bonding site; and R407 represents an oxygen atom, or a dicyanomethylene group; provided that two of R401 to R406 are each a bonding site; in the formula (A-5), R501 to R508 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, or a bonding site; R509 and R510 each independently represents an oxygen atom, or a dicyanomethylene group; R511 and R512 each independently represents a carbon atom, or a nitrogen atom; in the case where R511 is a nitrogen atom, R501 is not present, and in the case where R512 is a nitrogen atom, R505 is not present; provided that two of R501 to R508 are each a bonding site; in the formula (A-6), R601 to R608 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, a carboxylate ester group, or a bonding site; R610 and R611 each independently represents a carbon atom, or a nitrogen atom; in the case where R610 is a nitrogen atom, R604 is not present, and in the case where R611 is a nitrogen atom, R605 is not present; and R609 represents a dicyanomethylene group; provided that two of R601 to R608 are each a bonding site; in the formula (A-7), R701 to R713 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, a carboxylate ester group, or a bonding site; R714 and R715 each independently represents a carbon atom, or a nitrogen atom; in the case where R714 is a nitrogen atom, R704 is not present, and in the case where R715 is a nitrogen atom, R705 is not present; provided that two of R701 to R713 are each a bonding site; and in the formula (A-8), R801 to R808 each independently represents a hydrogen atom, an aryl group, an aryl group substituted with a halogen atom, a nitro group, a cyano group, an alkyl group or a halogenated alkyl group, an alkyl group, a cyano group, a nitro group, or a bonding site; provided that two of R801 to R808 are each a bonding site. |
