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 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: A smoothing device for a power supply is provided comprising a rectifier for rectifying an output of an alternating current power supply and at least a pair of electrolytic capacitors for smoothing an output of said rectifier. The pair of electrolytic capacitors have a non-polarized structure in which a pair of electrode foils each having an oxide film on a surface are wound into a roll with a separator containing an electrolyte interposed therebetween. A pair of electrodes are connected to each of said pair of electrode foils. At least one of the pair of electrodes has a mark for distinguishing them from each other. The pair of electrolytic capacitors are so connected that magnetic fluxes generated by said electrode foils are cancelled with each other.

Abstract: A lithographic printing plate precursor of direct image type, adequately prevented from occurrence of background stains and having excellent printing durability is provided, comprising a base and an image receptive layer provided on the base, in which the image receptive layer contains one or more types of non-aqueous solvent-dispersed resin grains obtained by subjecting to dispersion polymerization reaction in a non-aqueous solvent, a monofunctional monomer (A) being soluble in the non-aqueous solvent but insoluble after polymerization and containing at least one functional group capable of producing at least one polar group through decomposition and a monofunctional polymer [M] comprising a polymer principal chain containing at least recurring units each containing a silicon atom and/or fluorine atom-containing substituent, to only one end of which a polymerizable double bond group represented by General Formula (I), as described herein, is bonded.

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: A liquid developer for electrostatic photography which comprises a non-aqueous solvent having an electric resistance of at least 10.sup.9 .OMEGA..multidot.cm and a dielectric constant of not higher than 3.5, at least toner grains comprising a resin as a main component, and (a) at least one compound (A) having an effect for increasing the amount of charge and (b) at least one compound (B) having an effect for reducing the amount of charge. There is also disclosed a duplicating method using a liquid developer as described above, which is useful for developing a large number of electrophotographic materials over a long period of time.

Abstract: An electrophotographic lithographic printing plate precursor which utilizes an electrophotographic light-sensitive material comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein the binder resin contains at least one graft-type copolymer comprising at least (1) a monofunctional monomer containing a functional group which has at least one atom selected from a fluorine atom and a silicon atom and is capable of forming at least one hydrophilic group selected from a sulfo group, a phosphono group, a carboxy group and a hydroxy group through decomposition, and (2) a monofunctional macromonomer which has a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4, and has a polymerizable double bond group represented by the general formula (I) described herein bonded to only one terminal of the main chain thereof.

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance, a spectral sensitizer and a binder resin, wherein the binder resin contains (1) at least one resin (Resin (A)) which contains at least 30% by weight of a polymer component represented by the general formula (I) and a polymer component containing at least one acidic group selected from ##STR1## (wherein R represents a hydrocarbon group or --OR') and a cyclic acid anhydride-containing group, and which has at least one acidic group selected from the above-mentioned acidic groups at one terminal of the main chain of the copolymer; ##STR2## and (2) at least one graft type copolymer (Resin (B)) formed from at least one monofunctional macromonomer (M) and comprising an AB block copolymer composed of an A block comprising at least one polymer component containing at least one acidic group selected from ##STR3## and a cyclic acid anhydride-cont

Abstract: According to the present invention, a lithographic printing plate of direct image type capable of preventing the occurrence of background stains and having good printing durability and a process for the production thereof are provided. The process comprises (a) forming an image on a lithographic printing plate precursor comprising a base and a light-insensitive image receptive layer provided on the base, wherein the image receptive layer comprises resin grains comprising at least one polymer component having (1) at least one of a functional group represented by at least one of Formula (I) and Formula (II): ##STR1## wherein --W.sub.1 -- and --W.sub.2 -- each respectively represents --SO.sub.2 --, --CO-- or --OOC--; n.sub.1 and n.sub.2 each respectively represents 0 or 1; and X represents a halogen atom, or (2) having at least one of a formyl group and a functional group represented by Formula (III): ##STR2## wherein R.sub.1 and R.sub.2, which are the same or different, each represents hydrocarbon groups or R.

Abstract: An electrophotographic lithographic printing plate precursor having a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein the photoconductive layer contains at least one of the following non-aqueous solvent-dispersed resin grains having an average grain diameter of same as or smaller than the maximum grain diameter of the photoconductive zinc oxide grains: wherein the non-aqueous solvent-dispersed resin grains comprise copolymer resin grains obtained by (i) subjecting to a polymerization reaction in a non-aqueous solvent, a monofunctional monomer (A) being soluble in the non-aqueous solvent but insoluble after polymerization and containing at least one polar group, as described herein, and a monofunctional polymer [M] comprising a polymer principal chain containing at least recurring units each containing a silicon atom and/or fluorine atom-containing substituent, to only one end of which a polymerizable double bond gr

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance, a spectral sensitizer and a binder resin, wherein the binder resin contains (1) at least one resin (Resin (A)) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 which contains at least 30% by weight of a polymer component represented by the general formula (I) described below and from 0.1 to 10% by weight of a polymer component containing at least one acidic group selected from --PO.sub.3 H.sub.2, --SO.sub.3 H, --COOH, ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group), and a cyclic acid anhydride-containing group, and which has at least one acidic group selected from the above-described acidic groups at one terminal of the main chain of the copolymer; ##STR2## wherein a.sub.1 and a.sub.

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance, a spectral sensitizer and a binder resin, wherein the binder resin contains (1) at least one resin (Resin (A)) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 which contains at least 30% by weight of a polymer component represented by the general formula (I) described below and from 0.1 to 10% by weight of a polymer component containing at least one acidic group selected from ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group) and a cyclic acid anhydride-containing group, and (2) at least one resin (Resin (B)) having a weight average molecular weight of 5.times.10.sup.

Abstract: A lithographic printing plate precursor of direct image type, adequately prevented from occurrence of background stains and having excellent printing durability is provided, comprising a base and an image receptive layer provided on the base, in which said image receptive layer contains at least one resin grains containing at least one functional group capable of producing at least one polar group through decomposition, optionally at least a part of the resin being crosslinked.

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon at least one photoconductive layer containing an inorganic photoconductive substance and a binder resin, wherein the binder resin comprises (A) at least one resin having a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and containing not less than 30% by weight of a copolymerizable component corresponding to a repeating unit represented by the general formula (I) described below and from 0.5 to 20% by weight of a copolymerizable component having at least one acidic group selected from the group consisting of --PO.sub.3 H.sub.2, --SO.sub.3 H, --COOH, --OH, ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group)) and a cyclic acid anhydride-containing group; ##STR2## wherein a.sub.1 and a.sub.2 each represents a hydrogen atom, a halogen atom, a cyano group or a hydrocarbon group; and R.sub.

Abstract: An electrophotographic light-sensitive material is disclosed. The light-sensitive material comprises a support having provided thereon a photoconductive layer containing at least inorganic photoconductive particles and a binder resin, wherein the binder comprises a copolymer comprising at least a monofunctional macromonomer (M) having a weight average molecular weight of not more than 2.times.10.sup.4 and a monomer represented by the formula (III) as defined in the specification, the macromonomer (M) comprising at least one polymer component represented by the formulae (IIa) and (IIb) as defined in the specification and at least one polymer component containing at least one polar group, and the macromonomer (M) having a polymerizable double bond group represented by the formula (I) as defined in the specification bonded to only one terminal of the main chain of the polymer. The electrophotographic light-sensitive material has excellent electrostatic characteristics, moisture resistance and durability.

Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon at least one photoconductive layer containing an inorganic photoconductive substance and a binder resin, wherein the binder resin comprises at least (A) a low-molecular weight resin (resin A) of a graft copolymer formed from at least a monofunctional macromonomer (MA) and a monomer represented by the general formula (III) (monomer A), and having a specific acidic group bonded to only one terminal of the polymer main chain, and (B) a high-molecular weight resin (resin B) of a graft copolymer formed from at least one polyester type macromonomer (MB) represented by general formula (VIa), (VIb), (VIc) and (VId), wherein all the formulas are as defined in the specification. In a preferred embodiment the high-molecular weight resin (B) has at least one acidic group at the terminal of the main chain of the polymer.

Abstract: An electrophotographic light-sensitive material comprising a support having thereon a photoconductive layer containing at least inorganic phohtoconductive particles and a binder resin, wherein the binder resin contains (A) at least one resin comprising a graft copolymer having a weight average molecular weight of from 1.0.times.10.sup.3 to 2.0.times.10.sup.4 and containing, as copolymer components, at least (i) a monofunctional macromonomer (M) having a weight average molecular weight of not more than 2.times.10.sup.4 and containing at least one polymer component represented by formula (IIa) or (IIb) shown below and at least one polymer component having at least one polar group selected from the group consisting of --COOH, --PO.sub.3 H.sub.2, --SO.sub.3 H, --OH, and ##STR1## wherein R.sub.1 represents a hydrocarbon group or --OR.sub.2 (wherein R.sub.

Abstract: An electrophotographic lithographic printing plate precursor which utilizes an electrophotographic light-sensitive material comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein the binder resin contains at least one graft-type copolymer comprising, as a polymerizable component, at least one monofunctional macromonomer which has a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4, comprises at least one polymerizable component containing a functional group which has at least one atom selected from a fluorine atom and a silicon atom and is capable of forming at least one hydrophilic group selected from a sulfo group, a phosphono group, a carboxy group and a hydroxy group through decomposition, and has a polymerizable double bond group.

Abstract: An electrophotographic light-sensitive material is disclosed. The light-sensitive material comprises a support having provided thereon a photoconductive layer containing at least one inorganic photoconductive substance, a spectral sensitizer, and a binder resin which contains at least one binder resin (A) and at least one binder resin (B) as defined in the specification. The light-sensitive material is excellent in electrostatic charging characteristics and pre-exposure fatigue resistance.

Abstract: A process for producing an electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing an inorganic photoconductive substance and a binder resin is disclosed. The method comprises mixing the inorganic photoconductive substance and the binder resin to prepare a dispersion for forming the photoconductive layer, and coating the dispersion on the support, wherein the binder resin contains at least one resin (A) which has a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 contains a repeating unit represented by the formula (I) specified above as a polymer component, has a crosslinked structure prior to the preparation of the dispersion for forming the photoconductive layer, and has at least one acidic group bonded at only one terminal of at least one polymer main chain.