| 摘要 |
A naphthalene tetracarboxylic diimide based polymer having formula (1) below, and an electrophotographic photoreceptor, an electrophotographic cartridge, an electrophotographic drum and an electrophotographic image forming apparatus including the same, inhibit an injection of holes from an electroconductive substrate to minimize an image defect, where R1 is selected from the group consisting of: a hydrogen atom, a halogen atom, a C1-C20 substituted or unsubstituted alkyl group, a C1-C20 substituted or unsubstituted alkoxy group, a C6-C30 substituted or unsubstituted aryl group, and a C7-C30 aralkyl group; R2 is selected from the group consisting of: a C1-C20 substituted or unsubstituted alkylene group, a C1-C20 substituted or unsubstituted oxyalkylene group, a C6-C30 substituted or unsubstituted arylene group, and a C7-C30 aralkylene group, in which a substituting group is a halogen atom, an alkyl group, a halogenated alkyl group, an oxyalkyl group, or an aryl group; and n is an integer between 3 and 200, and preferably between 5 and 50.
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