A triarylamine derivative represented by general formula (1) below. In the general formula (1), R.sub.1, R.sub.2, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9 each represent, independently from one another, a hydrogen atom, an optionally substitute 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, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, R.sub.3 represents an alkyl group having a carbon number of at least 1 and no greater than 4, X represents an alkylene group having a carbon number of at least 1 and no greater than 6 or an oxygen atom, and n represents an integer of 1 to 3.

##STR00001##

Provided is a lamination-type electrophotographic photoreceptor comprising a conductive substrate, and a charge transport layer and a charge generation layer both on the conductive substrate, wherein the charge transport layer comprises a charge transport substance represented by the general formula (1), a binder resin, and a particulate silicon compound.

A multi-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a charge transport material, a binder resin, and silica particles. The charge transport layer is a monolayer. The charge transport layer is disposed as an outermost surface layer of the multi-layer electrophotographic photosensitive member. The silica particles have a content of at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of the binder resin. The binder resin includes a polyarylate resin. The polyarylate resin has a repeating unit represented by general formula (I) shown below. In general formula (I), R.sub.1-R.sub.3 and Y are defined as those described in the specification.

##STR00001##

A multi-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge generating material contains a titanyl phthalocyanine that exhibits a main peak at a Bragg angle (20.2) of 27.2 in a CuK characteristic X-ray diffraction spectrum. The hole transport material contains a triarylamine derivative represented by generic formula (1). The hole transport material has a mass ratio of at least 0.30 and no greater than 0.55 relative to the binder resin in the charge transport layer. In general formula (1), R.sub.1, R.sub.2, l, and m are the same as those defined in the specification.

##STR00001##

An electrophotographic photosensitive member includes a photosensitive layer containing a charge generating material, a charge transport material, and a binder resin. The photosensitive layer is a multi-layer type photosensitive layer or a single-layer type photosensitive layer. The multi-layer type photosensitive layer includes a charge generating layer that contains the charge generating material and a charge transport layer that contains the charge transport material and the binder resin, and in which the charge transport layer is located on the charge generating layer. The single-layer type photosensitive layer contains the charge generating material, the charge transport material, and the binder resin. The charge transport material is an enamine derivative represented by general formula (1). In general formula (1), R.sub.1, R.sub.2, l, m, and n are each as defined in the specification. ##STR00001##

An electrophotographic photosensitive member has a photosensitive layer. The photosensitive layer is a multi-layer photosensitive layer having a charge transport layer being an outermost layer or a single-layer photosensitive layer. The amount of silica particles contained in the photosensitive layer is at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of a binder resin contained in the photosensitive layer.

A triphenylamine derivative is represented by general formula (1). In the general formula (1): R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 each represent, independently of one another, a hydrogen 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, an optionally substituted alkenyl group having a carbon number of at least 2 and no greater than 6, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14; m represents an integer of at least 1 and no greater than 3; and n represents an integer of at least 0 and no greater than 2.

##STR00001##

A diamine compound is represented by general formula (1). In the general formula (1), R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 each represent, independently of one another, a hydrogen atom, 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, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14. m represents an integer of at least 1 and no greater than 3. n represents an integer of at least 0 and no greater than 2.

##STR00001##

A benzidine derivative is represented by general formula (1). In the general formula (1), R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 each represent, independently of one another, a hydrogen atom, 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, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14. n represents an integer of at least 0 and no greater than 2.

##STR00001##

The subject invention relates to a charge transport layer forming coating liquid containing a charge transport material, at least one selected from the group consisting of polycarbonate resins and polyester resins, at least one of xylene and toluene, and cyclopentanone. The proportion of cyclopentanone in the charge transport layer forming coating liquid is in the range of 50% by mass to 85% by mass relative to the total mass of at least one of xylene and toluene and cyclopentanone.