| 摘要 |
An electrophotographic photosensitive member and an electrophotographic apparatus, a device unit and a facsimile machine using an electrophotographic photosensitive member which comprises a conductive support, a photosensitive layer and a protective layer, the protective layer containing resin formed by hardening a light-setting type acrylic monomer, and the photosensitive layer containing at least one compound selected from the group consisting of (A), (B) and (C) below: (A) styryl compounds having a structure expressed by the following formula (1) and a melting point not higher than 135 DEG C.; <IMAGE> (1) wherein Ar1 and Ar2 are aromatic ring groups, Ar3 is a bivalent aromatic ring group or a bivalent heterocyclic group, R1 is an alkyl group or an aromatic ring group, R2 is a hydrogen atom, an alkyl group or an aromatic ring group, and n1 is 1 or 2, R1 and R2 possibly linking to form a ring when n1=1; (B) triarylamine compounds having a structure expressed by the following formula (2) and a melting point not higher than 150 DEG C.; <IMAGE> (2) wherein Ar4, Ar5 and Ar6 are each an aromatic ring group or a heterocyclic group: (C) hydrazone compounds having a structure expressed by the following formula (3) and a melting point not higher than 155 DEG C.; <IMAGE> (3) wherein R3 is a hydrogen atom or an alkyl group, R4 and R5 are alkyl groups, aralkyl groups or aromatic ring groups, n2 is 1 or 2, A is an aromatic ring group, a heterocyclic group or -CH=C(R6)R7 (R6 and R7 are hydrogen atoms, aromatic ring groups or heterocyclic groups, but will never be hydrogen atoms at the same time). The photosensitive member suppresses the occurrence of cracks during forming of the protective layer, has high durability, and is free from any image defects.
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