Abstract: The present invention provides a photosensitive composition for an infrared laser used for direct plate making, which has high sensitivity and good developing latitude and storage stability, and provides a planographic printing plate in which this composition is used. The positive-type photosensitive composition of the present invention has (a) a macromolecular compound having alkali-soluble groups and (b) a compound that has a phthalocyanine skeleton and has in its molecule at least one group which can form a bond by interaction with an alkali-soluble group in the macromolecular compound (a).

Abstract: A negative working image recording material which comprises the following four components (A) to (D): (A) at least one of compounds represented by following general formulas (I) to (V), or at least one of polymers obtained by radical polymerization using at least one of monomers represented by following general formulas (VI) to (X): (B) at least one cross-linking agent; (C) at least one infrared absorbing agent; (D) at least one novolak resin.

Abstract: An image recording material comprises at least a diazonium salt represented by following general formula (1), an infrared ray absorbing agent, a cross-linking agent which is cross-linked in the presence of an acid, and a binder. The image recording material enables direct planographic printing plate production from digital computer signals by conducting recording by using an infrared laser. Further, the image recording material has excellent storability.

Abstract: The present invention provide a planographic printing plate comprising a substrate having thereon a recording layer which comprises at least one of a polymer compound carrying on a side chain a functional group which generates sulfonic acid under influence of an acid, base or heating; and a photo acid-generating agent or acid-generating agent; thermal base-generating agent; or an infrared ray absorbing agent, and by this structure, a high sensitive positive type planographic printing plate which can be developed with water or requires no developing is provided.

Abstract: Disclosed is an image recording material which comprises a binder, a substance capable of generating heat by the absorption of light and a heat decomposable substance capable of substantially lowering the solubility of the binder when the substance is in an undecomposed state.

Abstract: A negative-working image-recording material containing both a substance which absorbs light and generates heat and a diazonium compound having two or more diazohio groups in the molecule and a negative-working lithographic plate for direct platemaking by heat mode writing, the lithographic plate comprising a support having provided on at least one surface a substance which absorbs infrared or near infrared light and generates heat and a diazonium compound having two or more diazonio groups in the molecule.

Abstract: A photosensitive lithographic printing plate which provides a wide range of proper conditions for development, high impression capacity, a flexible film sufficient in adhesion to a support and excellent processing suitability with a weakly alkaline developer (pH 12.5 or less) is disclosed. The photosensitive lithographic printing plate comprises a support and a photosensitive layer provided thereon, wherein the photosensitive layer is formed from a photosensitive composition containing at least a two-equivalent coupler residue-containing compound and a photosensitive compound or a photosensitive mixture acting as a positive type.

Abstract: An electrophotographic photosensitive material comprising a conductive support having thereon (a) a layer containing a charge transporting compound and a charge generating compound or (b) a combination of a layer containing a charge transporting compound and a layer containing a charge generating compound, wherein a novel disazo compound is contained as the charge generating compound, and a printing plate for electrophotographic process, which is prepared by subjecting an electrophotographic photosensitive material comprising a conductive support having thereon a photoconductive layer containing at least a charge generating material, a charge transporting material and a binder resin to an imagewise exposure and a development to form a toner image, and by removing a non-image area of the photoconductive layer other than the toner image area thereof, wherein at least one charge generating material is a novel disazo compound.

Abstract: A novel electrophotographic photoreceptor is provided, comprising on an electrically conductive support a light-sensitive layer containing at least one acetylene disazo compound represented by the general formula (I):Cp--N.dbd.N--Ar.sup.1 --C.tbd.C--Ar.sup.2 N.dbd.N--Cp (I)wherein Ar.sup.1 and Ar.sup.2 each represents an unsubstituted or substituted arylene group, divalent condensed polycyclic aromatic group or divalent aromatic heterocyclic group, with the proviso that Ar.sup.1 and Ar.sup.2 are not phenylene groups at the same time; and Cp represents a coupler residue.

Abstract: The present invention provides 4 embodiments of a new image forming method. The image forming method uses a light-sensitive material and an image receiving material. The light-sensitive material comprises a support and a light-sensitive polymerizable layer provided thereon. The light-sensitive polymerizable layer contains silver halide, a reducing agent, an ethylenically unsaturated polymerizable compound or/and a cross-linkable polymer and a colorant. The image forming method comprises an exposing step, a developing step, a removing step, a transferring step and a repeating step. Some embodiments of the method further contain a laminating step. The present invention is characterized in that a multicolor image is formed on an image receiving material by the repeating step.

Abstract: The present invention provides 6 embodiments of a new image forming method. The image forming method uses a light-sensitive material and an image receiving material. The light-sensitive material comprises a support and a light-sensitive polymerizable layer provided thereon. Some embodiments of the light-sensitive material further have an adhesive layer. The light-sensitive polymerizable layer contains silver halide, a reducing agent and an ethylenically unsaturated polymerizable compound or/and a cross-linkable polymer. Some embodiments of the light-sensitive polymerizable layer further contain a colorant. The image forming method comprises an exposing step, a developing step, a removing step and a transferring step or a laminating step. Some embodiments of the image forming method further contains a peeling step or a toning step. The present invention is characterized in the combination of the removing step with the transferring step or the laminating step.

Abstract: The present invention provides 3 embodiments of a new image forming method. The image forming method uses a light-sensitive material and an removing sheet. The light-sensitive material comprises a support and a light-sensitive polymerizable layer provided thereon. Some embodiments of the light-sensitive material further have an adhesive layer. The light-sensitive polymerizable layer contains silver halide, a reducing agent and an ethylenically unsaturated polymerizable compound or/and a cross-linkable polymer. Some embodiments of the light-sensitive polymerizable layer further contain a colorant. The image forming method comprises an exposing step, a developing step and a removing step. Some embodiments of the image forming method further contains a toning step. The present invention is characterized in the removing step using a removing sheet.

Abstract: An novel electrophotographic photoreceptor is provided comprising on an electrically conductive support a layer containing a charge-transporting compound and a charge-generating compound or a charge-transporting compound-containing layer and a charge-generating compound-containing layer, wherein said charge-generating compound is a trisazo compound represented by the general formula (1): ##STR1## wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, Ar.sup.5 and Ar.sup.6 each represents an arylene group, divalent condensed polycyclic aromatic group or divalent group derived from a monocyclic or condensed polycyclic heterocyclic aromatic group, each of which may have one or more substituents; C.sub.p respresents a coupler residual group; and n represents 1 or 2.

Abstract: A novel electrophotographic photoreceptor is provided comprising on an electrically conductive support a layer containing a charge-transporting compound and a charge-generating compound or a charge-transporting compound-containing layer and a charge-generating compound-containing layer, characterized in that as said electric charge-generating compound there is contained an azo compound containing an organic residue represented by general formula (1): ##STR1## wherein Ar.sup.2 represents a divalent aromatic hydrocarbon or aromatic heterocyclic group; Ar.sup.3 represents an aromatic hydrocarbon group or aromatic heterocyclic group; and Q represents a hydrogen atom, halogen atom, alkyl group, trifluoromethyl group, nitro group, cyano group or alkoxy group. In a preferred embodiment, the azo compound is represented by the general formula (2): ##STR2## wherein Ar.sup.1 represents an aromatic hydrocarbon group or aromatic heterocyclic group which may be connected thereto via a connecting group; Ar.sup.2 and Ar.sup.

Abstract: A novel electrophotographic photoreceptor is provided comprising on an electrically conductive support a layer containing a charge-transporting compound and a charge-generating compound or a charge-transporting compound-containing layer and a charge-generating compound-containing layer, characterized in that as said electric charge-generating compound there is contained a tetrakisazo compound represented by the general formula (1): ##STR1## wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, Ar.sup.5, Ar.sup.6 and Ar.sup.7 each represents an arylene group, divalent condensed polycyclic aromatic group or divalent heterocyclic aromatic group; and Cp represents a coupler residue.

Abstract: An electrophotographic photoreceptor comprising an electroconductive support having thereon a layer containing a charge carrier-transporting compound and a charge carrier-generating compound or having thereon a layer containing a charge carrier-transporting compound and a layer containing a charge carrier-generating compound, wherein the photoreceptor contains a tetrakisazo compound of the following formula (I) as the charge carrier-generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4, Ar.sub.5 and Ar.sub.6, which may be the same or different, each represents an arylene group, a divalent condensed polycyclic aromatic group or a divalent heterocyclic aromatic group;A represents ##STR2## X represents an atomic group necessary to form an aromatic ring or heterocyclic ring condensed with the benzene ring of the formula having the hydroxyl group and Y bonded thereto;Y represents ##STR3## R.sup.1 represents an alkyl group or a phenyl group; R.sup.

Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having thereon a layer which contains a charge carrier transporting compound and a charge carrier generating compound, or a layer which contains charge carrier transporting compound and a layer which contains a charge generating compound, wherein at least one type of tris-azo compound represented by formula (I) is included as a charge carrier generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4 and A are as defined in the specification.

Abstract: An electrophotographic photoreceptor comprising: (1) an electrophotographic photosensitive layer which comprises a charge carrier transporting compound and a charge carrier generating compound, or (2) an electrophotographic photosensitive layer which comprises a charge carrier transporting compound layer and a charge carrier generating compound layer, on an electrically conductive support, wherein said charge carrier generating compound is a bis-azo compound represented by formula (I): ##STR1## wherein, Ar.sup.1, Ar.sup.2, Ar.sup.5 and Ar.sup.6 represent aryl groups, Ar.sup.3 and Ar.sup.4 represent arylene groups, and R.sup.1 represents a hydrogen atom or an SO.sub.3 Na group.

Abstract: A liquid developer for electrostatic charge images comprising a polymer selected from (a) a polymer containing at least one polymerizable monomer represented by the following general formula (1) as a component of the polymer, and (b) a polymer containing at least one polymerizable monomer represented by the following general formula (2) and chloromethylstyrene a copolymer components, the polymer being dispersed in a carrier liquid having an electric resistance of at least 10.sup.9 .OMEGA..cm and a dielectric constant of at most 3, ##STR1## wherein all the symbols are defined in the specification.

Abstract: An electrophotographic photosensitive material is disclosed, containing (1) an organic photoconductive substance, and (2) at least one of a specific type of pyrylium compound, and, optionally (3) at least one of a specific type of amide compound. The material exhibits high sensitivity in a wavelength region of a semi-conductor laser and is stable to heat and humidity.