Abstract: A binder resin for high image quality toners used in copying machines and printers by electrophotography which are excellent in anti-offset property, fixing property, blocking resistance, and image characteristics obtained by controlling the molecular weight, blend ratio, acid value, and ratio of a high molecular weight polymer and a low molecular weight polymer of the binder resin to specific values.

Abstract: A photoconductive recording material described containing a support and a charge generating layer (CGL) in contiguous relationship with a charge transporting layer (CTL) containing a p-charge transporting material (p-CTM), wherein the charge generating layer (CGL) does not contain a charge transporting material but comprises a charge generating material and a binder, wherein the binder is made insoluble in methylene chloride by crosslinking and the binder which is composed essentially of one or more polyepoxy compounds self-crosslinked under the influence of an amine catalyst and/or crosslinked by reaction with at least one primary and/or secondary poly NH-group amine.

Abstract: An electrophotographic light-sensitive material which has improved electrostatic characteristics and image forming performance and is excellent particularly in reproducibility of highly accurate image using a liquid developer and image forming performance upon a scanning exposure system using a laser beam of a low power.The electrophotographic light-sensitive material contains, as a binder resin, at least one resin (A) which has a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and contains not less than 30% by weight of a polymer component of the formula (I) and from 0.5 to 15% by weight of a specified polar group-containing polymer component and at least one resin (B) which is an AB block copolymer having a weight average molecular weight of from 3.times.10.sup.4 to 1.times.10.sup.6 and comprising an A block containing a specified polar group-containing polymer component and a B block containing a polymer component of the formula (I). ##STR1## wherein a.sup.1 and a.sup.

Abstract: Disclosed are a coating solution for forming a charge generation layer, which comprises:(A) a phthalocyanine composition,(B) a binder resin represented by the formula: ##STR1## wherein R represents an alkylene group, R.sup.1 represents an alkyl group; and m, n and k each represent a ratio of recurring unit numbers and are numerals satisfying the relations of k+m+n=1, n>m>0 and 0.3.gtoreq.k.gtoreq.0,(C) at least one of a melamine resin and a benzoguanamine resin in a 1- to 5-fold amount in terms of the weight ratio of the amount of the binder resin, and(D) a solvent having both a hydroxyl group and an ether group in one molecule,and an electrophotographic photoreceptor using the same.

Abstract: The present invention is directed to an electrophotographic photoreceptor which is smooth without orange peel, inhibits the rise of a residual potential and the drop of a charged potential, and is excellent in stability even when it is repeatedly used.The photoreceptor comprises a charge generation material, a charge transport material, a polyarylate having a polymerization degree of 10 to 5,000, a polycarbonate having a polymerization degree of 10 to 5,000, and a polydimethylsiloxane having a polymerization degree of 0 to 2,000.

Abstract: The method of producing a binder resin has the steps of blending in advance (a) a starting material monomer mixture for two polymerization reaction types, (b) a compound which can react with both of starting material monomers for the two polymerization reaction types, and (c) a tricarboxylic or higher polycarboxylic acid or a derivative thereof, the two polymerization reaction types having independent reaction paths to each other in one reaction vessel; and concurrently carrying out the two polymerization reactions in one reaction vessel to give the binder resin. According to the present invention, the binder resin which has an excellent environmental stability in the tribo electric charge and the image quality, and also has good pulverizability and transparency can be produced. Moreover, in a fixing method using a heat roller, fixing at a low temperature can be performed without using an offset inhibiting liquid.

Abstract: An electrophotographic imaging member includes a charge generating layer, a charge transport layer and an interphase region. The interphase region includes a mixture of a charge generating material and a charge transport material, in intimate contact, and may be formed, for example, by applying a charge transport material prior to drying or curing an underlying charge generating layer to produce an interphase structure that is different from the charge generating and charge transport layers.

Abstract: The present invention is to provide an electrophotography type lithographic form plate having a high sensitivity and a superior photosensitive characteristic as a photosensitive material for a semiconductor laser beam as well as having an excellent printability as a lithographic form plate. The form plate comprises an electroconductive support member and a photosensitive layer formed thereon and containing a sensitizer mainly consisting of zinc oxide and a binder resin, wherein the sensitizer is at least one compound selected from a group of dye compounds represented by the following general formula (I), and a total acid value of the binder resin is within a range of 3.0 through 10.0. ##STR1## wherein, in the above formula, n represents 2 or 3; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent hyrogen atoms, lower alkyl groups, lower alkoxy groups, or halogen atoms, and X-represents an acid anion.

Abstract: An electrophotographic light-sensitive material which is excellent in image reproducibility, moisture resistance and anti-abrasion property, provides clear images of good quality and is particularly useful in a scanning exposure system using a semiconductor laser beam is provided.The electrophotographic light-sensitive material contains, as a binder resin, a resin (A) which has an acid value of from 5 to 120 and contains a component of the formula (I) shown below and a specified polar group-containing component and a resin (B) which is an AB or ABA block copolymer comprising an A block containing a component of the formula (II) shown below and a B block containing a component derived from a specific macromonomer having a specified polar group.In the formulae (I) and (II) below, a.sup.1 and a.sup.2 each represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, --COOR.sup.4 or --COOR.sup.4 bonded via a hydrocarbon group (R.sup.4 represents a hydrocarbon group); and R.sup.11 and R.sup.

Abstract: An electrophotographic photoreceptor showing no reduction in charge property and no increase in residual potential when repeatedly used under the circumstances of high temperature and humidity for a long time and exhibiting excellent environmental stability, which comprises an electrically conductive substrate having thereon at least a charge generating layer and a charge transporting layer, wherein a binder contained in said charge generating layer comprises at least one organic metal compound selected from the group consisting of organic metal alkoxides and organic metal chelate compounds.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer is disclosed, said photosensitive layer containing, as a binder resin, a polycarbonate resin comprising at least a repeating unit represented by formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represent a hydrogen atom, a halogen atom, an alkyl group having from 1 to 5 carbon atoms, a cycloalkyl group having from 5 to 7 carbon atoms or a phenyl group; and R.sub.5 and R.sub.6 are taken together to form a 5- to 8-membered carbonaceous ring substituted with at least two alkyl groups each having from 1 to 5 carbon atoms. The photoreceptor has high mechanical durability and satisfactory surface smoothness, resistance against reduction in image quality and sensitivity, and stability against environmental change and repeated use.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer comprising a binder resin having dispersed therein a phthalocyanine composition is disclosed, in which said binder resin is a curing fluorine resin, and said phthalocyanine composition comprises (A) an unsubstituted phthalocyanine compound and (B) a phthalocyanine derivative having a halogen atom(s) and/or electron attractive group(s) at the benzene nuclei, such that the ratio of the number of the halogen atom(s) and/or electron attractive group(s) to the total number of the phthalocyanine units in (A) and (B) is from 0.001 to 0.5. The photoreceptor has a low threshold value of photosensitive characteristics and exhibits high sensitivity in a digital behavior. Besides applicable to a digital recording system, the photoreceptor, when applied to a conventional PPC system, provides a sharp-edged high quality image.

Abstract: A photosensitive lithographic printing plate comprises a conductive support and provided thereon, a photoconductive layer of a composition comprising a photoconductor and an esterified compound of o-naphtho-quinonediazide sulfonic acid with a phenol resin, the phenol resin being a polycondensation compound of a monovalent phenol with an aldehyde or a ketone, and the content of the o-naphthoquinonediazide sulfonic acid residue being 0.4.times.10.sup.-3 to 3.0.times.10.sup.-3 mole per gram of the photoconductive layer.

Abstract: An electrophotographic imaging member including a substrate, a charge generating layer, a charge transport layer, and an overcoat layer comprising a hole transporting hydroxy arylamine compound having at least two hydroxy functional groups, hydroxy terminated diorgano siloxane and a polyamide film forming binder capable of forming hydrogen bonds with the hydroxy functional groups of the hydroxy arylamine compound and the hydroxy terminated diorgano siloxane.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having formed thereon a photosensitive layer containing at least a charge generating material, a charge transporting material, and a binder resin, wherein said charge transporting material comprises a benzidine compound and/or a low-molecular weight charge transporting material having a molecular weight of from 200 to 400 and said binder resin mainly comprises a polycarbonate resin comprising a recurring unit represented by formula (I): ##STR1## and having a viscosity-average molecular weight ranging from 50,000 and 100,000, said charge transporting material and said binder resin being at a weight ratio of from 25:75 to 60:40. The photoreceptor exhibits improved abrasion resistance and improved peeling resistance while retaining excellent electrical and image characteristics.

Abstract: There is disclosed an electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided thereon, wherein the photosensitive layer contains a random copolymer having a structural unit represented by the following Formula (I): ##STR1## and a structural unit represented by the following Formula (II): ##STR2##

Abstract: The present invention relates to an electrophotographic photosensitive member comprising an electroconductive support and a photosensitive layer formed thereon: the surface layer of the electrophotographic photosensitive member containing a first copolymer of a first construction unit represented by Formula (1) and a second construction unit represented by Formula (2), and a second copolymer of a third construction unit represented by Formula (3) and a fourth construction unit represented by Formula (4): ##STR1##

Abstract: Disclosed is an electrophotographic member containing as a charge transport material a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative which is remarkably excellent in solubility in an organic solvent and/or a binder such as polycarbonate resin, etc., can show very excellent electrophotographic properties such as high sensitivity, low residual potential and high durability. Further, a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative usable as a charge transport material, and a process for producing the same are disclosed. Furthermore, a fluorine-containing diarylamine usable for producing the fluorine-containing N,N,N',N'-tetraarylbenzidine derivative, and a process for producing the same are disclosed.

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: Disclosed is electrophotolithographic plate precursor having on a conductive support at least one photoconductive layer containing at least a random copolymer binder resin (P) (i) having a weight average molecular weight of from 5.times.10.sup.4 to 5.times.10.sup.5, (ii) comprising (a) a polymer component comprising particular methacrylate or acrylate monomers, (b) a polymer component containing at least one particular polar group and (c) a polymer component having a Fedors' solution parameter of 9.0 or more and containing at least a particular aprotic polar group, and (iii) having at least a particular polar group at one end of the main chain of the copolymer. The plate precursor may be etched with a combination of an etchant and a wetting water both having no problem in the environmental sanitation, to be formed into an offset printing plate not generating background staining. The printing plate has high printing durability and has excellent rubbing resistance.

Abstract: An electrophotographic material for color proofing which comprises a substrate, a photoconductive layer and a transfer layer in this order, wherein said photoconductive layer comprises a polymer (P) which contains at least one polymer segment (X) containing not less than 50% by weight of units having fluorine atom(s) and/or silicon atom(s) and at least one polymer segment (Y) containing units having photosetting and/or thermosetting group(s); a polymer (Q) which contains not less than 30% by weight of units represented by the formula (I):--CH(b.sup.1)--C(b.sup.2)(COOR.sup.3)--wherein b.sup.1 and b.sup.2 each represents independently a hydrogen atom, and R.sup.3 represents a hydrocarbon group, and contains at least one one-functional macromonomer containing one or more units having polar group such as --PO.sub.3 H.sub.2, --SO.sub.

Abstract: A photoconductive imaging member comprised of a supporting substrate, a photogenerating layer comprised of photogenerating pigments dispersed in a polystyrene/polyvinyl pyridine (A.sub.n -B.sub.m) block copolymer wherein n represents the degree of polymerization of A and m represents the degree of polymerization of B, and a charge transport layer.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having formed thereon a photosensitive layer containing, as binder resins, (A) a polycarbonate resin comprising a recurring unit represented by formula (I): ##STR1## and (B) a polycarbonate resin comprising a recurring unit represented by formula (II) or (III): ##STR2## wherein X.sub.1 and X.sub.2 each represent a hydrogen atom or an alkyl group, or (B') a copolycarbonate resin comprising a recurring unit represented by formula (II) and a recurring unit represented by formula (IV): ##STR3## said polycarbonate resin (B) or copolycarbonate resin (B') having a lower molecular weight than that of said polycarbonate resin (A). The photoreceptor had high film strength against abrasion and causes no toner filming or adhesion of any other foreign substances and is therefore excellent in electric characteristics and image characteristics.

Abstract: An electrophotographic light-sensitive material which has improved electrostatic characteristics and image forming performance and is excellent particularly in reproducibility of highly accurate image using a liquid developer and image forming performance upon a scanning exposure system using a laser beam of a low power.The electrophotographic light-sensitive material contains, as a binder resin, a low molecular weight resin (A) comprising an organic molecule having bonded thereto at least three polymer chains each containing a polymer component of formula (I) and a polymer component having a specified polar group, and a resin (B) which is a medium to high molecular weight AB block copolymer comprising an A block containing a specified polar group and a B block containing a polymer component of formula (I). ##STR1## wherein a.sup.1 and a2: hydrogen, halogen, a cyano group, a hydrocarbon group, --COOR.sup.4 or --COOR.sup.4 bonded via a hydrocarbon group (R.sup.4 : hydrocarbon group); and R.sup.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having formed thereon a photosensitive layer is disclosed, wherein said photosensitive layer contains, as a binder resin, a polyiminocarbonate resin comprising at least one of recurring units represented by formulae (I), (II) and (III): ##STR1## wherein the symbols are as defined in the specification. The polyiminocarbonate resin exhibits satisfactory solvent solubility and high compatibility with a charge transporting material and a charge generating material to provide a coating composition having satisfactory stability with time and a uniform coating film. The photoreceptor therefore has excellent electrophotographic characteristics and satisfactory productivity.

Abstract: Disclosed herein is an electrophotographic photoconductor comprising:a conductive substrate;a charge-generation layer formed on said conductive substrate; anda charge-transport layer formed on said charge-generation layer, said charge-transport layer comprising a charge-transport material and a binder resin which comprises a polycarbonate composed of at least one specified structural unit derived from benzophenone or a derivative thereof and at least one another specified structural unit derived from diphenylmethan or a derivative thereof.

Abstract: The present invention provides an electrophotographic photosensitive member which has a surface layer of high hardness, high resistance to abrasion and scratching, and high durability. The surface layer of the photosensitive member contains a polymerization product of a monomer compound represented by the formula (1) or (2).

Abstract: According to the The present invention, there are provided an electrophotographic photosensitive member, an electrophotographic apparatus comprising the electrophotosensitive member, and a facsimile system comprising the electrophotographic apparatus. The electrophotographic photosensitive member comprises a conductive support, a photosensitive layer and an intermediate layer interposed therebetween. The intermediate layer comprises a material derived from an isocyanate compound and a plurality of kinds of polyether polyol compounds, the polyether polyol compounds meeting at least one of the following requirements i) and ii):i) a ratio of a weight average molecular weight of at least one polyether polyol compound to a weight average molecular weight of at least one other polyether polyol compound is 1.3 or more; andii) at least one polyether polyol compound has different functionality from that in at least one other polyether polyol compound.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having provided thereon a photoconductive layer is disclosed, said photoconductive layer containing a high polymeric compound comprising a repeating unit comprised of a tetracarboxylic acid anhydride skeleton and a divalent organic group skeleton having an aromatic nucleus, said two skeletons being bonded via a nitrogen atom. Said high polymeric compound is formed by co-deposition of a tetracarboxylic acid anhydride compound and an aromatic diamine compound. The photoreceptor exhibits high sensitivity, high durability, and excellent image quality retention even when used repeatedly or in a high humidity environment.

Abstract: Disclosed is an electrophotographic member containing as a charge transport material a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative which is remarkably excellent in solubility in an organic solvent and/or a binder such as polycarbonate resin, etc., can show very excellent electrophotographic properties such as high sensitivity, low residual potential and high durability. Further, a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative usable as a charge transport material, and a process for producing the same are disclosed. Furthermore, a fluorine-containing diarylamine usable for producing the fluorine-containing N,N,N',N'-tetraarylbenzidine derivative, and a process for producing the same are disclosed.

Abstract: A compound represented by the formula (1): ##STR1## wherein Ar.sub.1 represents an arylene group; Ar.sub.2 and Ar.sub.3 independently represent an aryl group or an arylene group; R.sub.2 and R.sub.3, which may be identical or not, independently represent a hydrogen atom or an alkyl group having a carbon number of 4 or less, or R.sub.2 and R.sub.3 both represent --SiR.sub.4 R.sub.5 R.sub.6 (R.sub.4, R.sub.5 and R.sub.6, which may be identical or not, independently represent an alkyl group, aralkyl group or aryl group which may be substituted); R.sub.1 represents --SiR.sub.7 R.sub.8 R.sub.9 (R.sub.7, R.sub.8 and R.sub.9, which may be identical or not, independently represent an alkyl group, cycloalkyl group, aralkyl group or aryl group which may be substituted, or none (only in the case where R.sub.2 and R.sub.3 represent --SiR.sub.4 R.sub.5 R.sub.6), one or two of R.sub.7, R.sub.8 and R.sub.9 represent the following: ##STR2## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, R.sub.2 and R.sub.

Abstract: Disclosed is an electrophotographic receptor provided with an overcoat layer comprising a cured fluororesin and a nitrogen-containing compound selected from the group consisting of an aromatic amine antioxidant and a charge transport substance on the surface of a photosensitive layer containing a charge generating substance.

Abstract: Provided is an electrophotographic photoreceptor which comprises an electrically conductive support and a photoconductive layer comprising at least an organic photoconductive compound and an alkali and/or alcohol soluble binder resin provided on said support and which is used for making a lithographic printing plate therefrom by electrophotographically forming a toner image and decoating the photoconductive layer of non-image portion other than the toner image portion by contacting with an alkaline decoating solution, wherein an arithmetical mean deviation of profile (Ra.sub.1) of the surface of said electrically conductive support having said photoconductive layer thereon is 0.3-1.0 .mu.m and a ratio of Ra.sub.2 /Ra.sub.1 of an arithmetical mean deviation of profile (Ra.sub.2) of the surface of said photoconductive layer and the (Ra.sub.1) is 0.5-1.0. The image formed on the printing plate is free from indentation at the edge of the image. Resolution and sharpness of the image are improved.

Abstract: An electrophotographic lithographic printing plate precursor having a photoconductive layer containing resin (A) having a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and containing a polymer component of the specified repeating unit and a polymer component having a polar group and dispersed resin grain (L) which is obtained by dispersion polymerization of monomer (C) containing a functional group capable of forming a carboxy group upon decomposition in the presence of a dispersion stabilizing resin soluble in a non-aqueous solvent and which has a silicon and/or fluorine atom-containing substituent.The electrophotographic lithographic printing plate precursor has good electrophotographic characteristics and water retentivity due to the suitable interaction between zinc oxide, a spectral sensitizing dye, the resin (A) and the dispersed resin grain (L) and provides a printing plater having excellent printing image and good printing durability even under severe conditions.

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon at least one photoconductive layer containing an inorganic photoconductive substance, a spectral sensitizing dye and a binder resin, wherein the binder resin comprises at least one resin (A) and at least one resin (B) as described in the specification.

Abstract: An electrophotographic photosensitive member is disclosed which has an electroconductive support and a photosensitive layer formed thereon. The photosensitive layer contains at least one polycarbonate selected from the group consisting of polycarbonates (1) to (3); and a charge-transportion substance having the structure represented by the formula (4) or (5) and having an oxidation potential of not less than 0.6 eV. Also, an electrophotographic apparatus, device unit and facsimile machine employing the electrophotographic photosensitive member are disclosed.

Abstract: The present invention provides a new amino compound represented by the following general formula [I] excellent in charge transporting properties. ##STR1## The present invention provides a photosensitve member and an electroluminescence device both of which comprise the amino compound of the general formula [I] as a charge transporting material.

Abstract: A core for photographic light-sensitive material use made of wooden source material which can be recycled or decomposed in natural environment is disclosed. The core center is made of paper covered with a buffer layer made of 100% wooden pulp having a density of not more than 0.1 g/cm.sup.3. The buffer layer is covered with a reinforcing sheet made of paper with a tensile strength of 0.3 kg/15 mm width or more.

Abstract: An electrophotographic photoconductor is composed of a substrate and a photoconductive layer formed thereon. The photoconductive layer is composed of a polymer including an acrylic acid ester moiety of formula (I) as repeat unit: ##STR1## wherein R.sup.1 represents hydrogen or a methyl group; R.sup.2, R.sup.3, and R.sup.4 each represent an alkyl group having 1 to 4 carbon atoms, a benzyl group, a phenyl group, a phenoxyl group, chlorine or bromine; n is an integer of 1 to 4; m is 0 or 1; and k is 0 or 1.The polymer and the monomer from which the polymer is prepared are synthesized.

Abstract: A layered photoconductive imaging member comprised of a supporting substrate, a photogenerator layer comprised of perylene photoconductive pigments dispersed in a resin binder mixture comprised of at least two polymers, and a charge transport layer.

Abstract: An organic, positive-charging photoconductor for laser printers is disclosed. The photoconductor has a conductive substrate, a hydroxy-containing binder which forms a layer greater than or equal to about 1 micron thick on the substrate, a phthalocyanine pigment uniformly distributed throughout said binder, and a reactive stabilizer containing silicon, also uniformly distributed throughout said binder. The silicon-containing stabilizer reacts with the hydroxy group in the binder, the effect of which is to improve the electrical stability of the photoconductor in the severe laser printing electrophotographic environment, and to improve surface release characteristics of the photoconductor for more efficient toner image transfer.

Abstract: An electrophotographic imaging member including a charge generating layer and a charge transport layer, the charge transport layer including a charge transporting small molecule dissolved or molecularly dispersed in a film forming charge transporting polymer comprising charge transporting moieties in the backbone of the film forming charge transporting polymer, the charge transporting moieties having a structure substantially identical to the structure of the charge transporting small molecule, the charge transporting small molecule having an ionization potential substantially identical to the ionization potential of the polymer, and the charge transport layer being substantially free of electrically inactive film forming binder. This imaging member may be employed in an electrophotographic imaging process.

Abstract: A process for the preparation of layered photoconductive imaging members which comprises forming layers comprised of a mixture of cyclic oligomers with degrees of polymerization of from about 2 to about 20 and a catalyst, wherein one layer contains a conductive filler, the second layer contains a photogenerating pigment and the third layer contains charge transporting molecules, and heating said layers to convert the cyclic oligomer mixture in each layer to a polycarbonate resin.

Abstract: A photoconductive recording material containing a support and a charge generating layer (CGL) in contiguous relationship (contact) with a charge transporting layer (CTL), containing a n-charge transporting material (n-CTM), wherein the binder of said charge generating layer (CGL) is made insoluble in methylene chloride by crosslinking, and said binder is composed essentially of one or more polymeric reaction products of at least one epoxy resin with at least one polyamide resin having amino groups and being called herein polyaminoamide resin.

Abstract: An electrically conductive roll including (a) a cylindrical core body, (b) an electrically conductive, resilient layer located radially outwardly of the core body, the resilient layer containing a softening agent, (c) a preventive layer located radially outwardly of the resilient layer, the softening agent being prevented from spreading by the preventive layer, the preventive layer being formed of N-methoxymethylated nylon as a major constituent thereof, and containing an electrically conductive material, and (d) a resistance adjusting layer located radially outwardly of the preventive layer, the adjusting layer being formed of epichlorohydrin-ethylene oxide copolymer rubber as a major constituent thereof, the core body, resilient layer, preventive layer and adjusting layer constituting an integral cylindrical body.

Abstract: A lithographic plate blank for imaging on a laser printer comprises a sheet of flexible electrically non-conductive material and an image receiving etchable layer coating bonded on a surface thereof, the coating including zinc oxide, a resin binder, and an electrical property regulating agent and being effective to provide the plate with a surface resistance of between 10.sup.11 and 10.sup.14 ohms per square and a dark decay rate of at least 15 volts per second. A method of preparation of a blank plate and a method of preparation of an imaged plate are disclosed.

Abstract: Photosensitive materials which comprise, on a conductive support, a layer structure having at least one layer. The at least one film is made of a cured film of a dispersion of a photoconductor in a binder polymer which has recurring units of the following general formula ##STR1## wherein each m is individually from 0 to 4, but at least one m is not 0, X.sub.1 and X.sub.2 are bromine atoms and n is an integer. The photoconductor may be X-type metal-free phthalocyanine or .tau.-type metal-free phthalocyanine dispersed partially in a molecular state and partially in a particulate state. Alternatively, combinations of carrier generation and carrier transport agents may be used. The layer structure is either a single-layer structure or a double-layer structure.

Abstract: A process for the preparation of supporting substrates which comprises heating a mixture of cyclic oligomers with degrees of polymerization of from about 2 to about 20 and a catalyst.

Abstract: A process for the preparation of photoconductive imaging members which comprises coating a supporting substrate with a photogenerator layer comprised of photogenerating pigments, and subsequently applying to the photogenerating layer a mixture comprised of charge transport molecules and cyclic oligomers, and wherein said mixture is heated to obtain polycarbonate resin binder from said cyclic oligomers.

Abstract: An electrophotographic lithographic printing plate precursor having a photoconductive layer containing resin (A) having a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and containing a polymer component of the specified repeating unit and a polymer component having a polar group and dispersed resin grain (L) which is obtained by dispersion polymerization of monomer (C) containing a functional group capable of forming at least one group selected from a thiol group, a sulfo group, an amino group and a ##STR1## group upon decomposition in the presence of a dispersion stabilizing resin soluble in a non-aqueous solvent and which has a silicon and/or fluorine atom-containing substituent.The electrophotographic lithographic printing plate precursor has good electrophotographic characteristics and water retentivity due to the suitable interaction between zinc oxide, a spectral sensitizing dye, the resin (A) and the dispersed resin grain (L).