The invention relates to a multilayer type electrophotographic photoreceptor comprising: a conductive support; and, on the conductive support, a charge generation layer containing a hydroxygallium phthalocyanine pigment and a charge transport layer, wherein the content of α-chloronaphthalene in hydroxygallium phthalocyanine pigment in the charge generation layer is in a range of 0 ng/cm.sup.2 to 0.1 ng/cm.sup.2, the charge transport layer contains a non-halogen organic solvent having a boiling point of 140° C. or more, and the content of the non-halogen organic solvent having a boiling point of 140° C. or more is in a range of 0.1 μg/cm.sup.2 to 5 μg/cm.sup.2.

The present invention provides an electrophotographic photosensitive member in which a photosensitive layer has strong close adhesiveness even when used repeatedly, and a positive ghost is reduced. An undercoat layer of the electrophotographic photosensitive member contains a cured product of an electron transport material having a polymerizable functional group; a polyolefin resin having at least one group/structure selected from the group consisting of a carboxyl group, an alkoxycarbonyl group and an anhydrous carboxylic acid structure, and a substituted or unsubstituted phenyl group; and an isocyanate compound having two or more isocyanate groups.

The present invention provides an electrophotographic photosensitive member in which a photosensitive layer has strong close adhesiveness even when used repeatedly, and a positive ghost is reduced. An undercoat layer of the electrophotographic photosensitive member contains a cured product of an electron transport material having a polymerizable functional group; a polyolefin resin having at least one group/structure selected from the group consisting of a carboxyl group, an alkoxycarbonyl group and an anhydrous carboxylic acid structure, and a substituted or unsubstituted phenyl group; and an isocyanate compound having two or more isocyanate groups.

Electrophotographic photoreceptor including a conductive substrate, an organic photosensitive layer on an outer peripheral surface of the conductive substrate, and an inorganic protective layer on an outer peripheral surface of the organic photosensitive layer, the inorganic protective layer containing gallium and oxygen. A volume resistivity of an inner region of the inorganic protective layer, the inner region extending 0.2 m or about 0.2 m from an inner peripheral surface of the inorganic protective layer in a thickness direction, and a volume resistivity of an outer region of the inorganic protective layer, the outer region extending 0.2 m or about 0.2 m from an outer peripheral surface of the inorganic protective layer in the thickness direction, are both 6.010.sup.7 .Math.cm or more and 4.010.sup.8 .Math.cm or less or about 6.010.sup.7 .Math.cm or more and about 4.010.sup.8 .Math.cm or less.

Provided is an electrophotographic photosensitive member including in this order: a support; an undercoat layer, and a photosensitive layer, wherein the undercoat layer comprises at least one kind of polymer selected from the group consisting of: a polymer having a structural unit represented by the following formula (1); and a polymer having a structural unit represented by the following formula (2).

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The invention relates to a multilayer type electrophotographic photoreceptor comprising: a conductive support; and, on the conductive support, a charge generation layer containing a hydroxygallium phthalocyanine pigment and a charge transport layer, wherein the content of -chloronaphthalene in hydroxygallium phthalocyanine pigment in the charge generation layer is in a range of 0 ng/cm.sup.2 to 0.1 ng/cm.sup.2, the charge transport layer contains a non-halogen organic solvent having a boiling point of 140 C. or more, and the content of the non-halogen organic solvent having a boiling point of 140 C. or more is in a range of 0.1 g/cm.sup.2 to 5 g/cm.sup.2.

Electrophotographic photoreceptor including a conductive substrate, an organic photosensitive layer on an outer peripheral surface of the conductive substrate, and an inorganic protective layer on an outer peripheral surface of the organic photosensitive layer, the inorganic protective layer containing gallium and oxygen. A volume resistivity of an inner region of the inorganic protective layer, the inner region extending 0.2 m or about 0.2 m from an inner peripheral surface of the inorganic protective layer in a thickness direction, and a volume resistivity of an outer region of the inorganic protective layer, the outer region extending 0.2 m or about 0.2 m from an outer peripheral surface of the inorganic protective layer in the thickness direction, are both 6.010.sup.7 .Math.cm or more and 4.010.sup.8 .Math.cm or less or about 6.010.sup.7 .Math.cm or more and about 4.010.sup.8 .Math.cm or less.