Kyocera Document Solutions Inc.

Seiki Hasunuma

Jun Azuma

Kensuke Okawa

Tomofumi Shimizu

Kenji Kitaguchi

An electrophotographic photosensitive member () includes a conductive substrate () and a photosensitive layer () disposed directly or indirectly on the conductive substrate (). The photosensitive layer () has a charge generating layer () and a charge transport layer () disposed in order from the conductive substrate (). The charge generating layer () contains a charge generating material. The charge transport layer () contains a charge transport material, a binder resin, and a pigment that absorbs light having an irradiation wavelength. The binder resin includes a polyarylate resin including a repeating unit represented by general formula (1):   

Electrophotographic photosensitive member and image forming apparatus

An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4). 

Polyarylate resin and electrophotographic photosensitive member

A polyarylate resin is represented by general formula (1) shown below. In general formula (1), Rand Reach represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another. 

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Seiki Hasunuma