Abstract: A method of forming an electrophotographic photoreceptor capable of forming a smooth coating film free of pinholes, bubbles, surface unevenness, etc. in a short time as a coating film for forming a photosensitive layer is provided. The method includes heating and drying a coating film formed by coating a coating solution containing ingredients of the photosensitive layer and a solvent medium containing 30% by weight or more of a solvent having a relative evaporation rate of less than 1.7 represented by the following formula (1) in an air stream at a temperature of 50° C. or higher and 130° C. or lower supplied from a blowing nozzle, by a far infrared ray heating method and an induction heating method, by using, for example, a drying apparatus, thereby manufacturing the electrophotographic photoreceptor: (relative evaporation rate)=(time for evaporating n-butyl acetate)/(time for evaporating solvent)??(1).

Abstract: An electrophotographic photoreceptor comprising a layered-type photosensitive layer in which a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material are stacked, formed on a conductive supporting member made of a conductive material, wherein the electrophotographic photoreceptor has high sensitive characteristics to a semiconductor laser beam having a wavelength ranging from 380 to 500 nm; the charge transporting layer of the layered-type photosensitive layer contains as the charge transporting material, a triarylamine dimer compound represented by the general formula (1): wherein Ar1 and Ar2 may be the same or different, and represent an unsubstituted or substituted arylene group or heterocyclic derivative bivalent group, Ar3 and Ar4 may be the same or different, and represent an unsubstituted or substituted aryl group or heterocyclic group, R1 and R2 may be the same or different, and represent an alkyl group, m and n rep

Abstract: There provides an electrophotographic photoreceptor using a novel amine compound which has an excellent effect of ozone resistance and can be used for providing an electrophotographic photoreceptor having no adverse effect on other characteristics, and an image forming apparatus including the photoreceptor. The aim is attained by an electrophotographic photoreceptor formed by stacking a single layer type photosensitive layer containing a charge generating material and a charge transporting material, or a layered photosensitive layer, in which a charge generation layer containing a charge generating material and a charge transporting layer containing a charge transporting material are stacked in this order, on a conductive substrate made of a conductive material, wherein the single layer type photosensitive layer or the charge transporting layer of the layered photosensitive layer contains a specific amine compound.

Abstract: An object of the invention is to provide a highly reliable electrophotographic photoreceptor having high sensitivity, excellent in light responsivity, not suffering from lowering of such characteristics even when it is used under a low temperature circumstance or in a high speed electrophotographic process, and with less fatigue degradation upon repetitive use. In a photosensitive layer of an electrophotoreceptor, an enamine compound represented by the following general formula (1), for example, the following structural formula is contained as a charge transporting substance, and further at least one of an antioxidant and a light stabilizer is contained. Accordingly, an electrophotographic photoreceptor excellent in sensitivity and light responsivity in various environments, and with less fatigue degradation upon repetitive use is realized.

Abstract: To provide a novel triamine compound usable for providing an electrophotographic photoreceptor having excellent in effect of an ozone resistance, and causing no adverse effect in other characteristic aspects, and a method for producing the same, as well as an electrophotographic photoreceptor using the triamine compound, and an image forming apparatus having the same, there is provided the electrophotographic photoreceptor formed by laminating a monolayer type photosensitive layer containing a charge generating material and a charge transporting material, or a laminate type photosensitive layer having a charge generating layer containing the charge generating material and a charge transporting layer containing the charge transporting material laminated in this order, on a conductive supporting member made of a conductive material, the monolayer type photosensitive layer or the charge transporting layer of the laminate type photosensitive layer containing a specific triamine compound.

Abstract: An image forming apparatus having excellent chargeability, sensitivity and light responsivity of an electrophotographic photoconductor and capable of forming images of high quality and high resolution at a high speed in various circumstances, is provided. An electrophotographic photoconductor having a photosensitive layer containing the enamine compound represented by the following general formula (1), for example, the enamine compound represented by the following structural formula (1-1) as a charge transportation substance is mounted to an image forming apparatus and the volume average particle size of the toner contained in a developer 50 housed in a developing device 33 is set to a size from 4 to 7 ?m.

Abstract: An electrophotographic photoreceptor comprising laminating a monolayer type photosensitive layer containing a charge generation material and a charge transport material or a laminate type photosensitive layer obtained by laminating a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material in this order, on a conductive support, wherein the charge transport layer of the monolayer type photosensitive layer or laminate type photosensitive layer contains an enamine compound represented by the following formula (1).

Abstract: An electrophotographic photoreceptor of excellent durability having high sensitivity and light responsiveness, not suffering from lowering of the electric characteristics by exposure to light, change of circumstance, or repetitive use, and excellent in the cleaning property and not suffering from lowering of the picture quality of formed images for a long times, in which an enamine compound represented by the general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is incorporated in a photosensitive layer 14, and the surface energy (?) on the surface of the photosensitive layer 14 is set to 20.0 mN/m or more and 35.

Abstract: According to the present invention, an enamine compound having a specific structure is used as an organic photoconductive material. This enamine compound is obtained based on asymmetrical secondary naphtylamine which is readily available at a lowest price, by introducing phenyl groups containing substituents, as constituents units of the enamine part and presents excellent compatibility with binder resins, will not present detrimental effects such as partial crystallization at film forming and have a high charge mobility. The compound is able to realize highly reliable electrophotographic photoreceptor and an image forming apparatus which present a high electrostatic potential, high sensitivity and high enough light response and are excellent in durability and will not degrade in these characteristics under a low-temperature environment or in a high-speed process and will not lower in these characteristics even due to exposure to light.

Abstract: In an electrophotographic photoreceptor including a conductive substrate and a single layer type photosensitive layer, the aromatic polycarbonate is contained to a single layer type photosensitive layer, which aromatic polycarbonate includes a constituent unit represented by the following general formula (1) derived from a compound having a basic asymmetric bishydroxy enamine skeleton represented by the general formula: Accordingly, the electrophotographic photoreceptor is obtained which is excellent in charge transportability, mechanical strength, electric property, durability, etc. and can form good images for a long time.

Abstract: A coating liquid to be used for coating has a loss tangent tan ? of from 1 to 10 at a frequency of 6.28 radians/sec. A coating liquid supplying roll has a fine concave portion in at least a part of the circumferential length thereof, and in the vicinities of the both circumferential ends of the fine concave portion, the fine concave portion 8 has concave depth decreasing portions formed in such a manner that the depth of a fine concave decreases. The fine concave portion is constructed in such a manner that the sum L (=L1+L2) of a circumferential length L1 of a portion in which the fine concaves are formed in substantially the same depth and a circumferential length L2 of one concave depth decreasing portion becomes an integral multiple (1 or more) of a circumference Lc of the cylindrical substrate.

Abstract: The present invention provides an electrophotographic photoconductor comprising an electroconductive substrate and a photosensitive layer provided on the electroconductive substrate, wherein the photosensitive layer comprises a charge-generating material and a charge-transporting material, the charge-transporting material comprising a compound represented by the general formula (1): wherein Ar1 and Ar2 each independently represent an optionally-substituted arylene or bivalent heterocyclic group; Ar3 and Ar4 each independently represent a hydrogen atom, or an optionally-substituted aryl or monovalent heterocyclic group, but are not simultaneously hydrogen atoms; or Ar3 and Ar4 may be taken together to form an optionally-substituted bivalent cyclic hydrocarbon or heterocyclic group; and n is 0 or 1.

Abstract: To suppress generation of a joint when detaching an applicator roll and cylindrical substrate from each other in a simple control to form a coating film having a uniform thickness efficiently on the cylindrical substrate is provided. A coating liquid is supplied from a pan to an applicator roll via a metalling roll, the applicator roll supplied with the coating liquid and a cylindrical substrate provided so as to be close to or in contact with the applicator roll are rotated. The coating liquid is transferred from the applicator roll to the cylindrical substrate, and the cylindrical substrate is rotated in a predetermined number. Thereafter, such control is carried out that the circumferential speed V1 of one of the applicator roll and the cylindrical substrate is higher than the circumferential speed V2 of the other when detaching the applicator roll and the cylindrical substrate from each other.

Abstract: An amine compound represented by the following general formula (1) is incorporated as a charge-transporting substance into a charge-transporting layer of an electrophotographic photoreceptor.

Abstract: A charge transporting substance having three stilbene structures or butadiene structures in a molecule, represented by the following general formula is used as an organic photoconductive material. An electrophotographic photoconductor is prepared by causing a photosensitive layer which is disposed on a conductive support, to contain the organic photoconductive material in order to dispose the photoconductor to an image forming apparatus.

Abstract: An organic photoconductive material which is useful as a raw material compound for a variety of functional materials and makes it possible to implement an electrophotoconductor which is excellent in terms of the charge transporting performance, excellent in terms of dissolution in solvents and compatibility with resins, and excellent in terms of both the electrical properties and durability is provided. An example is an asymmetric bishydroxy compound which can be represented by the following structural formula (1aa). This compound is contained in a charge transforming layer 4 or a surface protective layer 5 of an electrophotoconductor 18. As a result, an electrophotoconductor 18 which is excellent in terms of the electrical properties and durability and can stably form high quality images without image defects such as black dots can be implemented.

Abstract: An electrophotographic photoreceptor having excellent electric characteristics such as sensitivity characteristic and light responsiveness with an excellent life duration of abrasion resistance so that no flaw and density unevenness are generated on to-be-formed images for a long period of time, is provided. In an electrophotographic photoreceptor (1), an enamine compound represented by the following general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is contained in a charge transporting layer (6), and a creep value (CIT) in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of 25° C. and relative humidity of 50%, is set to 2.70% or more and 5.00% or less, and a plastic deformation hardness value (Hplast) of the surface is set to 220 N/mm2 or more and 275 N/mm2 or less.

Abstract: A coating liquid to be used for coating has a loss tangent tan ? of from 1 to 10 at a frequency of 6.28 radians/sec. A coating liquid supplying roll has a fine concave portion in at least a part of the circumferential length thereof, and in the vicinities of the both circumferential ends of the fine concave portion, the fine concave portion 8 has concave depth decreasing portions formed in such a manner that the depth of a fine concave decreases. The fine concave portion is constructed in such a manner that the sum L (=L1+L2) of a circumferential length L1 of a portion in which the fine concaves are formed in substantially the same depth and a circumferential length L2 of one concave depth decreasing portion becomes an integral multiple (1 or more) of a circumference Lc of the cylindrical substrate.

Abstract: The invention is to provide an organic photoconductive material capable of realizing electrophotographic photoreceptors of high reliability that have high charge potential, high sensitivity, good responsiveness to light and good durability, of which the characteristics do not lower even when they are driven at low temperatures or at high speed and even when they are exposed to light, and to provide an electrophotographic photoreceptor that comprises the material and an image-forming apparatus. An organic photoconductive material of the following general formula (1), for example, an enamine compound of the following structural formula (1-1) is produced.

Abstract: An electrophotographic photoreceptor of high durability capable of providing stable excellent electrical characteristics over a prolonged period of time which electrophotographic photoreceptor excels in mechanical strength. A photosensitive layer (14) of an electrophotographic photoreceptor (1) includes a polyarylate resin having structural units, for example, those of the aforementioned formula (1-3) and an enamine compound represented by, for example, aforementioned formula (2-1). By virtue of these, the electrophotographic photoreceptor (1) of excellent mechanical strength and favorable electrical characteristics can be realized.