Kyocera Document Solutions Inc.

Yohei Yamamoto

Eiichi Miyamoto

Hiroki Tsurumi

Hideki Okada

Fumio Sugai

Kensuke Kojima

Tomofumi Shimizu

An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. A hole mobility &#x3bc;is at least 1.00&#xd7;10cm/V/second and an electron mobility &#x3bc;is at least 4.00&#xd7;10cm/V/second in the photosensitive layer as measured under conditions of a temperature of 23&#xb0; C. and an electric field intensity of 1.50&#xd7;10V/cm. A ratio (&#x3bc;/&#x3bc;) of the hole mobility &#x3bc;to the electron mobility &#x3bc;is at least 1.0 and no greater than 50.0.

Electrophotographic photosensitive member

A triarylamine derivative is represented by general formula (I). In general formula (I), Rand Reach represent, independently of one another, a chemical group selected from the group consisting of a halogen atom, an optionally substituted alkyl group having a carbon number of 1-6, an optionally substituted alkoxy group having a carbon number of 1-6, and an optionally substituted aryl group having a carbon number of 6-12. In general formula (I), k and l each represent an integer of at least 0 and no greater than 4. When k and l represent integers greater than 1, chemical groups Rbonded to the same aromatic ring and chemical groups Rbonded to the same aromatic ring may be the same or different to one another. In general formula (I), m and n each represent a different integer of at least 1 and no greater than 3. 

Triarylamine derivative, electrophotographic photosensitive member, and image forming apparatus

A triphenylamine derivative is represented by general formula (1). In general formula (1), Rto Reach represent, independently of one another, a chemical group selected from the group consisting of a halogen atom, an optionally substituted alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, and an optionally substituted aryl group having a carbon number of at least 6 and no greater than 12. Also, k, l, m, n, o, and p each represent, independently of one another, an integer of at least 0 and no greater than 4. When any of k, l, m, n, o, or p represents an integer greater than 1, chemical groups R, R, R, R, or Rbonded to the same aromatic ring may be the same or different. 

Triphenylamine derivative, electrophotographic photosensitive member, and image forming apparatus

A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below. 

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Osaka, Japan

Yohei Yamamoto