JP2003186225A5 - - Google Patents

Claims (25)

In an electrophotographic photosensitive member having a photosensitive layer and a protective layer in this order, directly or via an underlayer on a conductive support, the electrophotographic photosensitive member has at least a fluorine-containing resin as a binder resin for the photosensitive layer, and at least as a charge generation material. An electrophotographic photoreceptor comprising an azo pigment represented by the following formula (1) :
A- (N = N-Cp) _n (1)
(In the formula, A represents a central skeleton and represents a substituted or unsubstituted aromatic hydrocarbon ring group or heterocyclic group which may be bonded directly or via a bonding group. Cp has a phenolic hydroxyl group. N represents an integer of 1 to 3, provided that a plurality of —N═N—Cp are not bonded to the same benzene ring) . In an electrophotographic photosensitive member having a single layer type photosensitive layer in which a charge generating material and a hole transporting material are dispersed in a binder resin and a protective layer in this order on a conductive support. ,
The binder resin contains a fluorine-containing resin, and
An electrophotographic photoreceptor, wherein the charge generating material contains an azo pigment represented by the formula (1). The electrophotographic photosensitive member according to claim 1 or 2 containing a resin is formed by the protective layer to polymerize the curable compound. The electrophotographic photosensitive member according to any one of claims 1 to 3, wherein the protective layer contains a resin formed by polymerizing a thermosetting compound. The electrophotographic photosensitive member according to claim 4 , wherein the thermosetting compound is a phenol resin. The electrophotographic photosensitive member according to claim 5 , wherein the phenol resin is a resol type. The electrophotographic photoreceptor according to any one of claims 1 to 3, wherein the protective layer contains a resin formed by polymerizing a photocurable compound. The electrophotographic photosensitive member according to any one of claims 1-3 and 7, containing a resin formed by the protective layer is photocurable acrylic monomer or oligomer is polymerized. The protective layer is a conductive metal oxide fine particles, a lubricant particles, or conductive electrophotographic photosensitive member according to any one of claims 1-8 containing the oxide fine particles and a lubricant particles. Formula (1) electrons according to any one of claims 1 to 9, the central skeleton A charge generating material represented has one of four structures shown below in photoreceptor:

. The electrophotographic photosensitive member according to claim 10 , wherein the central skeleton A of the charge generation material represented by the formula (1) has a structure represented by the following formula (2) :

(In the formula, R ₁ represents O or C (CN) ₂ , R ₃ represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen group or a cyano group, and Y is bonded directly or via a bonding group. Represents a substituted or unsubstituted aromatic ring) . The electrophotographic photosensitive member according to claim 11 , wherein the central skeleton A of the charge generation material represented by the formula (1) has a structure represented by the following formula (3) :

(Wherein R ₃ , R ₄ and R ₅ represent a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom or a cyano group) . The electrophotographic photosensitive member according to any one of claims 1 to 12 , wherein at least one of the coupler residues Cp of the charge generation material represented by the formula (1) is a coupler residue represented by the following formula (4). Body :

(In the formula, X represents a residue necessary for forming a polycyclic aromatic ring or a heterocyclic ring by condensing with a benzene ring, and R ₆ and R ₇ are a hydrogen atom and an alkyl group which may have a substituent. R ₆ and R ₇ may form a cyclic amino group via a nitrogen atom, Z represents an oxygen atom or a sulfur atom, and m represents 0 or 1. a). The electrophotographic photosensitive member according to claim 13 , wherein the azo pigment is a bisazo pigment represented by the following formula (5) :

Wherein W represents a hydrogen atom or a halogen atom, and R ₈ and R ₉ are a hydrogen atom, a halogen atom, a nitro group, a cyano group, an alkyl group which may have a substituent, an alkoxy group, an aralkyl group, an aryl A group or an alkylamino group, and j and k are 1 or 2) . The electrophotographic photosensitive member according to any one of claims 1 to 14, wherein the fluororesin is a solvent-soluble. The electrophotographic photosensitive member according to claim 15 , wherein the fluororesin has at least a fluoroethylene structure as one of repeating units. The electrophotographic photosensitive member according to claim 15 , wherein the fluorine-containing resin contains a carboxyl group. The electrophotographic photoreceptor according to claim 17 , wherein the fluororesin is a copolymer of a polymerization active monomer and a polymerization active monomer having a carboxyl group in the molecule. The electrophotographic photosensitive member according to any one of claims 1 to 18, wherein the binder resin is a resin obtained by reacting cure the fluorine-containing resin and a melamine curing agent. The electrophotographic photosensitive member according to any one of claims 1 to 18, wherein the binder resin is a resin obtained by reacting cure the fluorine-containing resin and isocyanate curing agent. The electrophotographic photosensitive member according to any one of claims 1 to 20 charging type electrophotographic photoreceptor is negatively charged. The electrophotographic photosensitive member according to any one of claims 1 to 21 , which has a threshold value in a light attenuation curve of a potential at the time of light irradiation and is used for digital light input. The electrophotographic photosensitive member according to any one of claims 1 to 20 containing an organic hole transport material in the photosensitive layer. The electrophotographic photosensitive member according to any one of claims 1 to 23 , a charging means for charging the electrophotographic photosensitive member, a developing means for developing the electrophotographic photosensitive member on which an electrostatic latent image is formed, and a transfer step. A process cartridge which is integrally supported together with at least one means selected from the group consisting of cleaning means for collecting toner remaining on a later electrophotographic photosensitive member and is detachable from an electrophotographic apparatus main body. The electrophotographic photosensitive member according to any one of claims 1 to 23 charging means for charging the electrophotographic photoreceptor, exposing means for forming an electrostatic latent image was exposed to the charged electrophotographic photosensitive member, electrostatic An electrophotographic apparatus comprising: a developing unit that develops toner on an electrophotographic photosensitive member on which a latent image is formed; and a transfer unit that transfers a toner image on the electrophotographic photosensitive member onto a transfer material.