Abstract: Disclosed is a flexible photosensitive layer containing a polymeric binder, which is capable of being laminated and is applied to a preferably flexible support. The photosensitive layer comprises a photoconductor layer composed of a substantially organic photoconductor, the binder, a sensitizer and/or activator, in which the binder comprises at least one copolymer having repeating units of the general formula ##STR1## wherein R.sub.1 denotes ##STR2## and R.sub.2 denotes H or --CH.sub.3.

Abstract: An aggregate-type xerographic photoconductor wherein primary or secondary amines are used not only to solubilize the photoconductor's light sensitive organic dye, but also to act as a cross-linker for an epoxy binder of the bisphenol class. A combined CTL/CGL layer is described, having both hole transport and charge generating dye molecules. The resulting layer is useful either as single-layer, bimodal photoconductor, or as the CGL of a two-layer photoconductor.

Abstract: In an electrophotographic light-sensitive material comprising at least one electric charge generation layer comprising a charge generating substance and a binder resin therefor and at least one electric charge transport layer on an electrically conductive base, said electrophotographic light-sensitive material is a laminate type electrophotographic light-sensitive material wherein the binder resin for the electric charge generating substance contains at least one polyvinylpyridine resin.

Abstract: Disclosed is a method for making a complex layer type lithographic printing plate by forming a toner image on a printing original plate having organic electrophotographic photosensitive layer by electrophotographic process and treating non-image area other than the toner image area with an etching solution mainly composed of an alcohol solvent and/or an alkali solvent, said photosensitive layer being a complex layer type photosensitive layer which comprises a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said resin and having a group soluble in alcohol solvent and/or alkali solvent and a charge carrier transport layer containing a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent and thereafter treating non-image area other than the toner image area with the etching

Abstract: Photoconductive elements comprising a support, a .beta.-phase indium phthalocyanine charge generation layer and a charge transport layer have excellent photosensitivity in the infrared region of the electromagnetic spectrum.

Abstract: An image-forming member for electrophotography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.

Abstract: An etchable electrophotographic printing plate comprising a coating on a surface of an electroconductive support such as grained, anodized aluminum of effective amounts of photoconductive ZnO and of a sensitizing dye dispersed in an organic resin binder comprised of about 60-90 wt. % of C.sub.2 -C.sub.4 alkenyl C.sub.2 -C.sub.8 alkanoate, about 5-30 wt. % of di(C.sub.1 -C.sub.8 alkyl) C.sub.4 -C.sub.8 alkenedionate, about 2-8 wt. % of C.sub.3 -C.sub.8 alkenoic acid or C.sub.4 -C.sub.8 alkenedioic acid, and about 0.5-5.0 wt. % of a cross-linking agent. The preferred thermally cross-linkable organic resin binder is a random copolymer of 70 wt. % vinyl acetate, 24 wt. % dibutyl maleate; 5 wt. % acrylic acid and 1 wt. % glycidyl methacrylate. The etchable printing plate of the present invention is environmentally safe, has excellent shelf life and high sensitivity to actinic radiation.

Abstract: A photosensitive material for electrophotography is provided which has a very high sensitivity to rays having a wavelength included in the oscillation wavelength region of a laser printer, especially a semiconductor laser printer, and which also has a high charge potential. This photosensitive material comprises a phthalocyanine pigment, poly-N-vinylcarbazole, and an organic resin in which said phthalocyanine pigment and poly-N-vinylcarbazole are dispersed, wherein the weight ratio of phthalocyanine pigment to poly-N-vinylcarbazole is in the range of from 1.2 to 12 and the content of the organic resin is 35% to 70% by weight based on the total amount of the photosensitive material.

Abstract: An electrophotographic photoreceptor is disclosed, which is comprised of a conductive support having thereon an electrophotographic photoreceptive layer containing a charge generating material and a charge transporting material. The charge generating material is a particular compound having both a barbituric acid nucleus or thiobarbituric acid nucleus and a heterocyclic ring residue.

Abstract: An electrophotographic photosensitive member comprises a layer containing a hydrazone compound represented by the following formula (1) or (2): ##STR1## wherein, Z is an atomic group necessary to complete a substituted or unsubstituted heterocyclic ring; R.sub.11, R.sub.12, R.sub.21, R.sub.22 and R.sub.23 represent substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl, and the combinations of R.sub.11 with R.sub.12 and of R.sub.22 with R.sub.23 can form each a pyrrolidine ring, piperidine ring, or morpholine ring; n is 1 or 2; and A is a monovalent heterocyclic compound residue.

Abstract: This invention is directed to an improved photoresponsive device comprised in the order stated of (1) an optional supporting substrate, (2) a conductive layer, (3) a photogenerating layer comprised of an inorganic photoconductive composition, or an organic photoconductive composition, dispersed in a resinous binder material comprised of a poly(hydroxyether) material selected from the group consisting of those of the following formulas: ##STR1## wherein X and Y are independently selected from the group consisting of aliphatic groups and aromatic groups, Z is hydrogen, an aliphatic group or an aromatic group, and n is a number of from about 50 to about 200, and (4) in contact with the photogenerating layer a charge transport layer comprised of an electrically active composition dispersed in an insulating organic resinous binder, which composition is of the following formula: ##STR2## wherein X is selected from the group consisting of ortho (CH.sub.3), meta (CH.sub.3), para (CH.sub.

Abstract: A process for the production of lithographic printing plates, and a light-sensitive material for use in the process are described. The light-sensitive material comprises an electrically conductive support having a hydrophilic surface, and a positive type light-sensitive layer and a photoconductive insulative layer on the support, wherein the positive type light-sensitive layer and the photoconductive insulative layer are provided on the support as a unit layer or individually in that order, and the photoconductive insulative layer can be charged either positively or negatively. The desired lithographic printing plate can be prepared by treating the light-sensitive material by the simple process of the invention.

Abstract: A reusable electrophotographic element comprising a photoconductive layer containing sensitized zinc oxide particles and first and second binding agents that are incompatible is produced by employing as the first binding agent a macromolecular compound that has a higher affinity to zinc oxide than the second binding agent, is largely deposited on the zinc oxide, has an average molecular weight of at least 12,000 and is present in the photoconductive layer in an amount of 1.5 to 9% by weight calculated on the zinc oxide, with the second binding agent present in substantially larger amount. The photoconductive layer is formed of agglomerates of zinc oxide particles substantially enveloped in the first binding agent, which agglomerates have a diameter of between 2.5 and 6 .mu.m and are stuck together by portions of the second binding agent, thus providing a substantially porous photoconductive layer having a negative charge density of at most 1 m Coulomb per m.sup.2.

Abstract: In a complex type electrophotographic plate comprising an electroconductive support, superposed thereon a charge generating material (CGL) layer and a charge transport material layer superposed on the CGL layer when there is used as said charge transport material at least one compound of the formula:X--(CH.dbd.CH).sub.n --CH.dbd.Ywherein X is a heterocyclic group of the formula: ##STR1## Y is a heterocyclic group of the formula: ##STR2## these heterocyclic groups may be substituted by one or more lower alkyl groups, halogen atoms, or phenyl groups; Z is an oxygen, sulfur or selenium atom; R is an alkyl group having 1 to 7 carbon atoms; n is an integer of 1 or 2; and one hydrogen atom in the group of the formula --(CH.dbd.CH).sub.n -- may be substituted by an alkyl group having 1 to 4 carbon atoms, a halogen atom, a phenyl group, a styryl group or a group of the formula: ##STR3## electrophotographic characteristics such as light sensitivity, dark decay characteristics, repetition characteristics, etc.

Abstract: An electrophotographic photosensitive member comprises a photoconductive layer composed of photoconductive powders dispersed in a deionized resin.

Abstract: A novel photosensitive composition including a photoconductive cadmium sulfide-group compound and a water-soluble prepolymer capable of forming a network structure by cross-linking, the composition being applied as a photosensitive layer of a photosensitive article for electrophotography having a conductive substrate.

Abstract: There is disclosed an electrophotographic lithographic printing plate having a precoat layer having improved water resistance and organic solvent resistance and an improved photoconductive layer which comprises:(1) a paper base;(2) a precoat layer on one side of said paper base, which precoat layer contains at least(a) 10% by weight or less (based on total solids) of a film-forming water-soluble polymer,(b) about 30 to about 80% by weight (based on total solids content) of a water-dispersible resin, and(c) an inorganic pigment;(3) a photoconductive layer provided on said precoat layer, which photoconductive layer contains(a) photoconductive zinc oxide, and(b) at least 2 binder resins different in acid value from each other by 5 or more, said mixed binder resins in the photoconductive layer having an average acid value of 5 to 30; and(4) a conductive back-coat layer on the other side of said paper base, which back-coat contains at least(a) 10% by weight or less (based on total solids) of a film-forming water-s

Abstract: Disclosed is a photosensitive plate for electrophotography, which comprises a conductive substrate and a layer of a composition formed by dispersing a photoconductor in a binder resin, which is formed on the substrate, wherein the resin binder comprises an epoxy resin component and an amine type curing agent component and the resin binder further comprises an acid anhydride as the ozone deterioration preventing agent.This photosensitive plate is excellent in the ozone resistance and the moisture resistance.

Abstract: An aqueous composition-sensitive photoconductive composition useful in the preparation of aqueous composition decoatable electrophotographic elements, such elements and low cost lithographic printing plates prepared from said elements the aqueous composition-sensitive photoconductive composition comprising the admixture of an inorganic photoconductor, an organic photoconductor and an aqueous composition-sensitive resin, and, if desired, to increase exposure speed, a dyestuff photosensitizer.

Abstract: Disclosed are electrophotographic elements comprising a support having coated thereon a photoconductive composition comprising a photoconductor dispersed in a linear film-forming polyester resin having its terminal hydroxyl and carboxyl groups endblocked with aprotic groups. The aprotic groups reduce hydrogen bonding within the resin matrix, and enhance the flowability of the resin when heated. Electrophotographic elements utilizing polyester resin binders endblocked in accordance with the present invention possess improved fusibility as compared with similar electrophotographic elements containing equivalent but protic endblocked polyester matrices, and as a result can be readily developed by flash fusing. In addition, such electrophotographic elements containing polyester resin binders endblocked in accordance with the instant invention possess improved photographic speed, and often improved dark decay properties, as compared with electrophotographic elements containing protic endblocked polyester matrices.

Abstract: A triphenylmethane polymer, a process for production thereof, and photoconductive compositions and a member containing the polymer are described; the polymer is represented by formula (I) ##STR1## wherein R is an alkyl group, X is H or a methyl group, Z is an alkylene group or a p-xylylene group, Y is H, a methyl group, a methoxy group, a tertiary amino group, halogen, a nitro group or a cyano group, Q is H or a methyl group, and n represents a polymerization degree sufficient to obtain the intrinsic viscosity [.eta.] of the polymer from 0.005 to 1.000.

Abstract: In an electrophotographic photosensitive member having a photoconductive layer composed of a photoconductive material and a binder, improvement wherein said binder is a curable rubber.

Abstract: Organic photoconductive elements which are stable and sensitive over a broad range of the spectrum, including the near infrared band, having a charge generating layer and a charge transport layer carried on an electroconductive support are disclosed. The invention involves the use of a first layer between the support and the charge generating layer which is capable of functioning as (i) an adhesive bonding layer on the electroconductive support to provide a receptive and retentive base layer for the charge generating layer and (ii) as a barrier layer to prevent substantially any leakage of charge from the surface of the photoconductor, characterized by the first layer comprising at least one polycarbonate having a weight average molecular weight ranging from about 25,000 to about 45,000, in combination with a charge generating layer that comprises at least one organic pigment which is sensitive to near infrared radiation.

Abstract: An improvement in the method of preparing a coating or layer of reprographic material upon a substrate which includes the conventional steps of coating the substrate surface with a layer of resinous binder curable upon exposure to radiant energy including electron beam and ultraviolet radiation, the binder layer containing reprographic solids. The resinous binder is applied as a fluid and is irradiated until a coherent and adherent layer is formed. The method includes the steps of forceably applying and tautly maintaining a sheet of a smooth flexible film against the surface of the curable resinous binder while directing a beam of radiant energy through the sheet and onto the binder while the layer of flexible film is held thereagainst. The exposure to radiant energy is continued until the resinous binder is substantially completely cured, whereupon the sheet of flexible film is removed from the surface of the binder.

Abstract: A photosensitive material for electrophotography having an improved photosensitivity is provided, which comprises copper phthalocyanine as a photoconductor, 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole as a charge transport material and a binder resin in which said photoconductor and charge transport material are dispersed. The content of the binder resin is 50 to 70% by weight based on the total amount of the photosensitive material and the weight ratio of copper phthalocyanine to 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole is in the range of from 2.5 to 6.5.

Abstract: A process for preparing a lithographic printing plate from an electrophotographic photosensitive material comprising a photoconductive insulating layer containing photoconductive zinc oxide and a thermoplastic insulating resin disposed on a waterproof support, said method comprising the steps of electrical charging, imagewise exposure, and development of the material in a wet developer having toner particles containing an oleophilic component dispersed in an insulating liquid carrier, thereby providing an oleophilic toner image, and heating the developed photosensitive material under such conditions that when an adhesive tape having a tackiness of 280 to 350 g/10 mm wide portion as measured by the 180.degree. peeling method of JIS C2107 (passed once between pressure rollers at 50 mm/sec) and which has been contact-bonded to the surface of said toner image-bearing photosensitive material by passage between a metal roll and a rubber roll pressed against said roll at a pressure of 6000 g/cm.sup.

Abstract: A noncrystalline silicon powder having excellent photoconductivity is described, comprising silicon and hydrogen, exhibiting an infrared absorption spectrum characterized by absorption peaks centered at about 2000 cm.sup.-1 and 630 cm.sup.-1, wherein the height of the absorbance peak at 2000 cm.sup.-1 is at least one-tenth the height of the peak centered at 630 cm.sup.-1, and exhibiting a spin density of not more than 10.sup.18 cm.sup.-3 determined by electron spin resonance spectroscopy; the noncrystalline silicon powder is used as highly efficient photoconductor in photoconductive compositions utilized for the production of electrophotographic photoreceptors.

Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises an electrically conductive layer. The second layer comprises a charge transport layer. The third layer is a photoconductive layer contiguous with the transport layer. The photoconductive layer is capable of photogenerating and injecting photogenerated holes into the contiguous or adjacent electrically active part. The electrically active material comprises a polycarbonate resin material having dispersed therein from about 25 to 75 percent by weight of one or more compounds having the general formula: ##STR1## wherein X is selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms (e.g. methyl, ethyl, propyl, butyl, etc.) and chlorine in the ortho, meta or para position. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.

Abstract: An electrophotosensitive member having a photoconductive layer prepared by dispersing in a binding resin, photoconductive powder particles coated with a thermoplastic resin. By the use of the such photoconductive powder particles coated with the resin, there can be provided an electrophotosensitive member particularly excellent in the moisture resistant property.

Abstract: A sensitizing dye and a hydrophilic resin are dissolved in a first solvent, and a second solvent is added to the solution. The second solvent is less volatile than the first solvent, miscible therewith and does not dissolve both of the sensitizing dye and the hydrophilic resin. A powder of the sensitized zinc oxide is incorporated into the solution. After blending, the mixture is dried and pulverized to obtain a powder of sensitized zinc oxide. This powder is then mixed with a bonding agent consisting of a resinous material having an acid value of 5-30 to form a mixture which is formed into a thin photosensitive layer for use in electrophotography.

Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises an electrically inactive organic resinous material containing from about 10 to about 75 percent by weight of: ##STR1## The above compound has the chemical name bis(4-diethylamino-2-methylphenyl)-4-diphenylaminophenyl methane. The charge transport layer while substantially non-absorbing in the spectral region of intended use is "active" in that it allows injection of photogenerated holes from the photoconductive layer, and allows these holes to be transported through the charge transport layer. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.

Abstract: A method of rendering a surface of substrate photoconduction comprising applying to the substrate a layer of N-vinyl carbazole and a prepolymer formed thereupon and completely polymerizing the monomer or prepolymer in situ on the substrate.

Abstract: The present invention relates to a photosensitive element for electrophotography comprising on an electrically conductive support a charge carrier generating phase and a charge carrier transport phase containing a P-type organic semiconductor, a poly-N-vinylcarbazole and/or its derivative, a Lewis Acid and a Bronsted acid.

Abstract: An electrophotographic element comprising, in successive layers; a conductive substrate, a charge generation layer and a charge transport layer, the charge generation layer being formed by the steps of; adding to a dispersion comprising a photoconductive organic pigment, a solvent and a resin being superior in mutual solubility with said solvent a resinous solution comprising said solvent and a resin being relatively inferior in mutual solubility with said solvent to the former resin; dispersing (or stirring) the resulting mixture again, thereby obtaining a photoconductive organic pigment-dispersed resinous solution; and applying said resinous solution onto the conductive substrate and drying.

Abstract: Photoconductive layers containing a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of photoconductors represented by the following formula ##STR1## wherein R is selected from the group consisting of alkyl, aralkyl, and substituted and unsubstituted aryl;X and X' which may be the same or different are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyl, NO.sub.2 and halogen;Y and Y' which may be the same or different are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyl, halogen and NO.sub.

Abstract: An electrophotographic element comprising a conductive substrate and a mono-layer type or multi-layer type photosensitive layer, superposed thereon, containing a photoconductive material in which said photoconductive material is a hydrazone compound having the following general formula (I) or an anile compound having the following general formula (II): ##STR1## [where R.sub.1 is a methyl, ethyl 2-hydroxyethyl or 2-chloroethyl group; R.sub.2 is a methyl, ethyl, benzyl or phenyl group; and R.sub.3 is chlorine, bromine, a C.sub.1 -C.sub.4 alkyl group, a C.sub.1 -C.sub.4 alkoxy group, a dialkylamino group with C.sub.1 -C.sub.4 alkyl or a nitro group.] ##STR2## [where R.sub.1 is the same as the said general formula (I); and R.sub.4 is a substituted or non-substituted phenyl, naphthyl, heterocyclic or C.sub.1 -C.sub.10 alkyl group.

Abstract: The present invention provides a photosensitive material for use in electrophotography which is superior in durability, resistance to solvents and light sensitivity, which comprises a photoconductive layer consisting essentially of an inorganic or organic photoconductor and an ionizing radiation-curable resin as formed on a conductive support, said photoconductive layer having been cured by applying said radiation.

Abstract: A multilayer photoconductive element containing a photoconductive insulating composition and a conducting layer, such element having in association with the photoconductive composition an amorphous, water-insoluble polyester selected from the group consisting of(a) polyesters prepared from units derived from at least one aromatic dicarboxylic acid component and at least one diol component, at least one of said acid or diol components being a non-linear monomer selected from the group consisting of an isophthalic acid component or a branched-chain alkylene diol having the formulaHO--CH.sub.2 --R.sup.1 --CH.sub.2 --OHwherein R.sup.

Abstract: Disclosed is an adhesive generating layer for use in an overcoated photoreceptor system, this layer containing a generating pigment dispersed in a copolymer of a siloxane and a dihydroxy compound of the formula: ##STR1## wherein R and R' are independently selected from the group consisting of alkyl, substituted alkyl, alkenes, substituted alkenes, aryl and substituted aryl; Y is a dihydroxy radical; and n is a number of sufficient value that the average molecular weight of the resulting silicone copolymer is between about 2,000 and 250,000. Examples of copolymers include those wherein R and R' are alkyl groups such as methyl and Y is a biphenol such as 2,2-bis-(4-hydroxy phenyl)-propane, one preferred material being a methyl octyl siloxane 2,2-bis-(4-hydroxy phenyl)-propane copolymer.

Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises a polycarbonate resin containing from about 25 to about 75 percent by weight of one or more of a compound having the general formula: ##STR1## wherein X is selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms (e.g. methyl, ethyl, propyl, butyl, etc.) and chlorine in the ortho, meta or para position. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.

Abstract: An imaging member comprising a charge generation layer comprising a layer of photoconductive material and a contiguous charge transport layer of a charge transport material dissolved in a polymer of the following structure: ##STR1## wherein R', R", R'" and R"" are independently selected from the group consisting of alkyl and alkylene groups having from 1 to 12 carbon atoms, there being no more than 1 alkylene group present, x is from 4 to 5, y is from 0 to 1, n is a whole number and said polymer has a molecular weight ranging from about 1500 to about 120,000, said transport layer being substantially nonabsorbing in the spectral region at which the photoconductive layer generates and injects photogenerated holes, but is capable of supporting the injection of photogenerated holes from said photoconductive layer and transporting said holes through said charge transport layer.

Abstract: Photoconductive layers and elements and methods for their use are disclosed. The layers and elements include polycarbonate binders and overcoats having pendant polar groups.

Abstract: A photoconductive element giving prolonged service without appreciable deterioration of its properties as the imaging medium in an indirect electrophotograpic copier is obtained by the provision, on an electrically conductive support that preferably is electrically conductive paper coated with a thin layer of hydroxyethyl cellulose, of a photoconductive layer composed essentially of continuous tone zinc oxide and at least one other photoconductive zinc oxide dispersed in a binder consisting predominantly of an organic polymer having an acid number between 10 and 30, such as an acrylic resin or such resin with 1 to 15% of styrene-modified alkyd resin, at a weight ratio of between 5 and 3 parts of zinc oxide per part of binder. The content of continuous tone zinc oxide preferably is limited to a minor proportion amounting to between 6 and 30% of the total zinc oxide content.

Abstract: A sintered high sensitive electrophotographic plate free of cracks in a photoconductive layer and exfoliation of it from a substrate can be obtained by adding an inorganic material, whose melting or softening temperature is higher than a firing temperature, into a mixture composed essentially of photoconductive material and a glass binder having a softening temperature lower than the firing temperature.

Abstract: This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, optionally an insulating intermediate layer, and a photoconductive layer composed of at least one layer comprising charge carrier-producing and charge transporting compounds, a binder, and conventional additives, the improvement that the recording material comprises a 75 to 250 .mu.m thick support, and, in the form of a photoconductor web, is sufficiently flexible that it is not prone to the formation of hairline cracks when repeatedly conducted over rollers of at least 12 mm diameter, said binder being a cellulose nitrate with a viscosity of 400.+-.25 cPoises at concentrations between about 4 and 12 percent in a 5 percent aqueous acetone solution, according to DIN 53 179 (standard type 4-12).

Abstract: The method for forming an electrostatic image according to the present invention comprises the steps of charging an electrophotographic photoreceptor, which is subjected to dark decay after the charging step, and effecting an exposure by activation light and an imagewise exposure on the electrophotographic photoreceptor. The exposure by activation light is effected prior to the imagewise exposure and in a step including at least a portion of the charging step or dark decay. This causes a remarkable sensitization effect in the electrophotographic photoreceptor, suitably adapted for use in an electrophotographic copying machine of a repeated transfer type.