Abstract: An electrophotographic photoreceptor includes: a conductive supporting member; a photosensitive layer that is disposed on the conductive supporting member; and a non-contact IC tag that retains inspection information including a previously measured characteristic parameter of the photosensitive layer.

Abstract: An image forming apparatus includes a photoreceptor, a latent image-forming unit that forms an electrostatic latent image on the surface of the photoreceptor with light, a developing unit that develops the electrostatic latent image using a toner to form a toner image, a color data-applying unit that applies the color data with light to the toner image, a transferring unit that transfers the toner image onto a surface of a recording medium, a fixing unit that fixes the toner image onto the surface of the recording medium, and a color formation unit that forms color of the toner image, the photoreceptor having a surface layer that scatters or absorbs the light which the color data applying unit applies to the toner image and that transmits the light which the latent image-forming unit applies to form the electrostatic latent image.

Abstract: An image forming method includes a photoreceptor preparation step, a coated paper preparation step, a charging step, an exposure step, a development step, and a transfer step. The electrophotographic photoreceptor has a conductive support and a photosensitive layer disposed on the conductive support. The photosensitive layer on the farthest side from the conductive support, includes a surface layer containing at least one selected from the group consisting of fluorine based resin fine particles, a carbonate resin, an arylate resin. The coated paper has a substrate and a coated layer, disposed on at least one surface of the substrate. The coated layer contains an adhesive containing latex having a glass transition temperature of 20° C. or higher and a pigment, and the surface, opposite to the substrate, of the coated layer has a glossiness of 10% or more.

Abstract: An electrophotographic photoreceptor includes: a conductive supporting member; a photosensitive layer that is disposed on the conductive supporting member; and a non-contact IC tag that retains inspection information including a previously measured characteristic parameter of the photosensitive layer.

Abstract: An image forming method includes a photoreceptor preparation step, a coated paper preparation step, a charging step, an exposure step, a development step, and a transfer step. The electrophotographic photoreceptor has a conductive support and a photosensitive layer disposed on the conductive support. The photosensitive layer on the farthest side from the conductive support, includes a surface layer containing at least one selected from the group consisting of fluorine based resin fine particles, a carbonate resin, an arylate resin. The coated paper has a substrate and a coated layer, disposed on at least one surface of the substrate. The coated layer contains an adhesive containing latex having a glass transition temperature of 20° C. or higher and a pigment, and the surface, opposite to the substrate, of the coated layer has a glossiness of 10% or more.

Abstract: An electrophotographic photoreceptor having, between an electroconductive substrate and a photosensitive layer, an interlayer which contains fine metal oxide particles and a binder resin and which, when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH, has a volume resistivity of from 108 to 1013 &OHgr;·cm and, when an electric field of 106 V/m is applied thereto at 15° C. and 15% RH, has a volume resistivity which is up to 500 times the volume resistivity thereof as measured when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH.

Abstract: An electrophotographic photoreceptor having, between an electroconductive substrate and a photosensitive layer, an interlayer which contains fine metal oxide particles and a binder resin and which, when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH, has a volume resistivity of from 108 to 1013 &OHgr;·cm and, when an electric field of 106 V/m is applied thereto at 15° C. and 15% RH, has a volume resistivity which is up to 500 times the volume resistivity thereof as measured when an electric field of 106 V/m is applied thereto at 28° C. and 85% RH.

Abstract: Provided are a process for producing a high-molecular-weight polycarbonate, which comprises polymerizing a diol and a carbonate diester through transesterification with heating in the presence of a basic oxide catalyst, and an electrophotographic photoreceptor containing this high-molecular-weight polycarbonate as a binder resin. This process can easily produce the high-molecular-weight polycarbonate safely without having an adverse effect on humans and environment. This electrophotographic photoreceptor can provide a high-quality image having a high stability at high speed over a long period of time.

Abstract: An electrophotographic photoreceptor is disclosed which comprises an electrically-conductive substrate having provided thereon an undercoat layer and a photosensitive layer, wherein said undercoat layer comprises a crosslinkable matrix and an electron-transporting material.

Abstract: An electrophotographic photoreceptor is disclosed which comprises an electroconductive support, a first interlayer formed on the support and containing low-resistance electroconductive particles having a specific resistance of from 10.degree. to 10.sup.4 .OMEGA.cm, a second interlayer formed on the first interlayer and containing high-resistance electroconductive particles having a specific resistance of from 10.sup.4 to 10.sup.8 .OMEGA.cm, and a photosensitive layer formed on the second interlayer. In the electrophotographic photoreceptor, in which the interlayers have an increased thickness for hiding defects present on the support and contain electroconductive particles dispersed therein, the photosensitive layer is free from the electrification performance decrease caused by charge injection thereinto and the interlayers have excellent leak-preventive properties.

Abstract: An electrophotographic photoreceptor excellent in electric characteristics and having few defects in image quality, and an image forming method for forming an image free from defects in image quality by the contact charging system. The inventive electrophotographic photoreceptor comprising a conductive substrate having thereon an undercoat layer and a photosensitive layer, in which the undercoat layer comprises a copolymer resin having a hydrolytic silyl group. The copolymer resin having hydrolytic silyl groups is preferably an acrylic copolymer resin. Further, the undercoat layer may contain electrically conductive particles. When an image is formed using this electrophotographic photoreceptor, a method comprising contacting a charging device with a surface of the electrophoto-graphic photoreceptor and supplying charge from the outside to charge the photoreceptor can be employed.

Abstract: A process for the preparation of an electrophotographic photoreceptor having a high sensitivity and stability and an excellent product quality stability without being affected by the production environment is disclosed, which comprises coating on a substrate a functional layer-forming coating solution containing a compound which undergoes polycondensation upon hydrolysis, adjusting a temperature of said substrate having the coated layer such that relationship (1) is satisfied, and then moistening said coated layer at a temperature of 30.degree. C. to 180.degree. C. in an atmosphere of a dew point of 25.degree. C. to 80.degree. C.:DP.ltoreq.ST.ltoreq.DP+40.degree. C. (1)wherein DP represents the dew point upon said moistening and ST represents the temperature of the substrate just before said moistening.

Abstract: A novel dichlorotin phthalocyanine crystal having distinct diffraction peaks at 8.5.degree., 11.2.degree., 14.5.degree., and 27.2.degree. of the Bragg angles (2.theta..+-.0.2) in the X-ray diffraction spectrum; a process for producing the dichlorotin phthalocyanine crystal, comprising mechanically grinding a known dichlorotin phthalocyanine crystal together with an inorganic salt, followed by, if desired, a solvent treatment; an electrophotographic photoreceptor containing, in the photosensitive layer thereof, the dichlorotin phthalocyanine crystal; and a coating composition for producing an electrophotographic photoreceptor, comprising the dichlorotin phthalocyanine crystal, a binder resin, and an acetic ester solvent. The photoreceptor exhibits high sensitivity and excellent durability. The coating composition maintains the dichlorotin phthalocyanine crystal in its desired form either while being prepared or after being coated.

Abstract: An electrophotographic photoreceptor comprising an electroconductive support having thereon a light-sensitive layer. At least the outermost layer of the light-sensitive layer contains (1) fine grains of at least one of a melamine-formaldehyde condensate and a benzoguanamine-formaldehyde condensate, and, as a binder resin, a polycarbonate resin comprising a constitutive unit represented by formula (II); or (2) fine grains of a benzoguanamine-melamine-formaldehyde condensate having an average grain size of from 0.03 to 4 .mu.m.

Abstract: Crystals of chlorogallium phthalocyanine, having distinct diffraction peaks at (i) 7.4.degree., 16.6.degree., 25.5.degree. and 28.3.degree., (ii) 6.8.degree., 17.3.degree., 23.6.degree. and 26.9.degree., or (iii) 8.7.degree. to 9.2.degree., 17.6.degree., 24.0.degree., 27.4.degree. and 28.8.degree. of the Bragg angle (2.theta..+-.0.2) to a CuK.alpha. characteristic X-ray; a photoconductive material for electrophotographic photoreceptor comprising the chlorogallium phthalocyanine; and an electrophotographic photoreceptor comprising an electroconductive support having thereon a light-sensitive layer containing at least one or more of chlorogallium phthalocyanine crystals. The electrophotographic photoreceptor has excellent sensitivity and durability.

Abstract: A novel dichlorotin phthalocyanine crystal having distinct diffraction peaks at 8.5.degree., 11.2.degree., 14.5.degree., and 27.2.degree. of the Bragg angles (2.theta..+-.0.2) in the X-ray diffraction spectrum; process for producing the dichlorotin phthalocyanine crystal, comprising mechanically grinding a known dichlorotin phthalocyanine crystal together with an inorganic salt, followed by, if desired, a solvent treatment; an electrophotographic photoreceptor containing, in the photosensitive layer thereof, the dichlorotin phthalocyanine crystal; and a coating composition for producing an electrophotographic photoreceptor, comprising the dichlorotin phthalocyanine crystal, a binder resin, and an acetic ester solvent. The photoreceptor exhibits high sensitivity and excellent durability. The coating composition maintains the dichlorotin phthalocyanine crystal in its desired form either while being prepared or after being coated.

Abstract: An electrophotographic method for image formation comprising forming an electrostatic latent image on an electrophotographic photoreceptor comprising a conductive substrate having formed thereon a photosensitive layer containing a high polymeric arylamine compound represented by formula (I): ##STR1## wherein n represents an integer of from 5 to 5000; m represents 0 or 1; y represents 1, 2, or 3; Ar represents ##STR2## wherein R represents a methyl group, an ethyl group, a propyl group, or a butyl group; Ar' represents ##STR3## wherein R is as defined above; X represents an alkylene or isoalkylene group having from 2 to 10 carbon atoms; and Z represents ##STR4## or --Ar--(W).sub.k --Ar--, wherein Ar is as defined above; W represents --CH.sub.2 --, --C(CH.sub.3).sub.

Abstract: An electrophotographic photoreceptor excellent in durability is disclosed, which has a conductive substrate having provided thereon a photosensitive layer, wherein said photosensitive layer contains a copolymerized polycarbonate resin comprising repeating units represented by structural formula (I) and repeating units represented by structural formula (II) as a binder resin: ##STR1## wherein m/(n+m) is from 0.1 to 0.9 by molar ratio.

Abstract: An electrophotographic photoreceptor comprising an electrically conductive substrate having thereon a photosensitive layer is disclosed, wherein the photosensitive layer contains, as a charge generating material, a dispersion of selenium or a selenium alloy and at least one squarylium compound represented by formula (I): ##STR1## wherein A represents a fluorine atom, a hydrogen atom or a hydroxyl group, with B representing a hydroxyl group; or A represents a hydrogen atom or a fluorine atom, with B representing a methyl group, in the same binder resin. The electrophotographic photoreceptor not only has broad spectral sensitivity from the visible to infrared region but is excellent in other electrophotographic properties.

Abstract: An electrophotographic photoreceptor for use in electrophotography having a photosensitive layer on an electrically conductive substrate. A fluorine-containing lubricating layer is further place upon the photosensitive layer. The fluorine-containing lubricating agent is selected from perfluoroalkyl polyether or its derivatives.