Abstract: Disclosed is an electrophotographic photoreceptor comprising an electrically conductive support and thereon formed a light-sensitive layer containing a carrier generation material, a carrier transport material and a binder resin, wherein said light-sensitive layer comprises a copolymer having a structural unit represented by Formula B.sub.1 and Formula B.sub.2 ; ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group, R.sub.1 and R.sub.2 may combine together to form a cyclic hydrocarbon residue having 4 to 10 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyclic hydrocarbon residue having 4 to 10 carbon atoms, or an aryl group, l, m, p and q independently represent an integer of 1 to 4. The electrophotographic photoreceptor has high sensitivity and high durability.

Abstract: Disclosed is an electrophotographic photoreceptor comprising a conductive support and provided thereon an intermediate layer, a carrier generation layer and a carrier transport layer, wherein an outermost layer of said electrophotographic photoreceptor contains silica particle each containing an aluminium ingredient of not more than 1000 ppm, a calcium ingredient of not more than 300 ppm and a iron ingredient of not more than 1000 ppm, and said silica particles have a volume average particle size of 0.05 through 5 .mu.m.

Abstract: An electrophotographic image-forming method is disclosed. The image forming method comprises the steps of (1) forming an electrostatic latent image on a rotating electrophotographic photoreceptor having an organic photoconductive layer, (2) developing the electrostatic latent image with a toner comprising toner particles which contain a releasing agent existing in the toner particle in a form of insular domain having a number average diameter of 0.1 .mu.m to 1.1 .mu.m to form a toner image, (3) transferring the toner image to an image receiving member, and (4) cleaning the surface of the photoreceptor after the transferring step by a cleaning member having a rubber elastic cleaning blade having an impact resilience of 35 to 75% which is contacted to the surface of the photoreceptor in the direction counter to the rotating direction of the photoreceptor with a pressure of 5 to 40 g/cm, and the coefficient of static friction between the cleaning blade and the surface of the photoreceptor is not more than 1.0.

Abstract: An electrostatic image forming method is disclosed. The photoreceptor containing an organic photosensitive material has a layer containing fine particles at the photoreceptor surface; toner has at least binder resin, coloring agent, and releasing agent made of polyolefines in which the ratio, Mz/Mn, is is 3-20, and Mz is 20,000-70,000 wherein Mz is Z-average molecular weight in terms of polypropylene and Mn is the number average molecular weight in terms of polypropylene. No offset phenomenon occurs, and a stable image having no fogging and no black-spots can be formed for a long period of time by the invention.

Abstract: Disclosed is an image forming method using an electrophotographic photoreceptor comprising the steps of:(1) charging the electrophotographic photoreceptor, wherein said electrophotographic photoreceptor comprising a conductive support and provided thereon, a carrier generation layer and a carrier transportation layer, said carrier generation layer comprising a carrier generation material represented by formula 1 or 2 and having X-ray diffraction pattern having peaks at 6.3.degree..+-.0.2.degree., 12.4.degree..+-.0.2.degree., 25.3.degree..+-.0.2.degree. and 27.1.degree..+-.0.2.degree. in Bragg angle (2.theta.) when using Cu-K.alpha. ray as a X-ray radiation source in which said peak of 12.4.degree..+-.0.2.degree. has a maximum intensity and has a half width of 0.65.degree. or more; no peak being present at 11.5.degree..+-.0.2.degree.,(2) imagewise exposing the charged photoreceptor for an exposure time of 1.times.10.sup.-4 to 3.times.10.sup.

Abstract: Disclosed is an electrophotographic photoreceptor contains a carrier generation material represented by Formula 1 or 2 having peaks at 2.theta.=6.3.degree., 12.4.degree., 25.3.degree. and 27.1.degree. in the Bragg angle (2.theta..+-.0.2.degree.) as measured by X-ray diffraction under radiation of Cu-K.alpha. rays; said peak of 12.4.degree. has a maximum intensity and has a half width of 0.65.degree. or more; no peak being present at 11.5.degree.

Abstract: The present invention is directed to a photoreceptor having an electroconductive support, a barrier layer, a charge generation layer and a charge transport layer, all formed on the support in this order, wherein the barrier layer consists of an alcohol-soluble copolymerized polyamide resin, the charge generation layer contains a compound represented by formula I or II, and the charge transport layer contains a polycarbonate resin having a molecular weight of not less than 100,000, ##STR1## wherein Z represents a groups of atoms necessary to form a substituted or unsubstituted divalent aromatic ring.

Abstract: Disclosed is a method for preparing an electrophotographic photoreceptor comprising the steps of:(a) preparing a dispersion solution comprising a carrier generation material, a binder resin and an organic solvent; and(b) coating said dispersion solution on a conductive support; wherein said carrier generation material is a fluorenone type bisazo pigment represented by Formula F.sub.1, and main component of said organic solvent is selected from the group consisting of a ketone type solvent, an ester type solvent and an alcohol type each having a branched alkyl group: ##STR1## wherein X.sub.1, X.sub.2, p, q, and A, are defined as in the Specification.

Abstract: An electrophotographic photosensitive member having improved anti-oxidation properties by ozone, comprising a conductive substrate, disposed thereon, a photosensitive layer which includes, as principal constituents, a charge generating material and a charge transporting material, wherein the photosensitive layer contains at least one type of compound selected from a group of those represented by any of the following [A] through [D]:[A] Compounds represented by the following general formula [I]; ##STR1## [B] Bisspiroindene compounds represented by the following general formula [II]; ##STR2## [C] Bisspiroindene compounds represented by the following general formula [III]; ##STR3## [D] Compounds having in the molecular structure thereof at least one structure selected from the following groups; ##STR4## [wherein R represents a hydrogen atom, or organic substituent group.

Abstract: An image forming method which employs an electro-photographic photoreceptor having high sensitivity, high resistance to damage, high durability, and high resistance to ozone oxidation. The method comprises charging the surface of the photoreceptor with positive charge, the photoreceptor including a photoconductive base, a photoreceptive layer formed on the base and consisting of at least a layer having a charge transport function and a layer having a charge generating function, and a resin-containing non-photoreceptive layer formed on the photoreceptive layer as required, and in which one layer placed above the layer having a charge transport function contains an antioxidizing agent, forming an electrostatic latent image on the surface of the photoreceptor by image-like exposure, then developing the electrostatic latent image.