Abstract: Radiation sensitive thermally developable imaging elements comprise:a) photosensitive silver halide,b) light insensitive silver salt oxidizing agent,c) reducing agent for silver ions, andd) an antifoggant or speed enhancing compound comprising hydrobromic acid salts of nitrogen-containing heterocyclic ring compounds which are further associated with a pair of bromine atoms. The antifoggants are effective in reducing spurious background image densities.

Abstract: Photothermographic emulsions sensitive to ultraviolet radiation can be coated on both sides of polymeric film which is inherently absorptive of the ultraviolet radiation, preventing crossover effects in cassette loading of the film.

Abstract: An image-forming method employs a light-sensitive material comprising a support and a light-sensitive layer provided thereon which contains a silver halide, a reducing agent, an ethylenically unsaturated polymerizable compound and a specific development inhibitor precursor. The image-forming method comprises heat-developing the light-sensitive material after or simultaneously with imagewise exposure of the material so as to imagewise polymerize the polymerizable compound in the presence of a development inhibitor released from the precursor in the course of the heat development. The image-forming method may be also performed under such condition that a liquid such as water is contained in the light-sensitive layer of the light-sensitive material within the specific amount.

Abstract: An image is formed in a photographic element by a process comprising a step of heating a heat-developable photosensitive material in the presence of a specific compound which typically releases a phenylmercaptotetrazole having a substituted benzene ring and serving as a development retarder.

Abstract: A heat developing photosensitive material is disclosed, comprising silver halide, a binder, a reducing agent and a heat solvent, wherein said heat solvent is at least one selected from the group consisting of compounds represented by Formulae I, II and III: ##STR1##

Abstract: A heat developable color photographic material is disclosed, which has a high speed and lowered fog. The photographic material comprises a blue-sensitive silver halide, a reducing agent and a binder, and a layer containing blue-sensitive silver halide contains a compound represented by the following formula I: ##STR1## wherein Z represents a group of atoms necessary for completing an aromatic ring or a heterocyclic ring which may have a condensed ring.

Abstract: A heat developable color light-sensitive material comprising a support having thereon at least light-sensitive silver halide, a reducing agent and/or a reducing agent precursor, a binder, a dye providing substance which releases a mobile dye in counter-correspondence to a latent image formed by imagewise exposure, and an oxidizable compound which has a single bond cleaved by reduction and which does not release any substance having a photographic effect.

Abstract: A heat-developable light-sensitive material comprising a support having provided thereon a light-sensitive layer comprising a silver halide which is spectrally sensitized with at least one dye represented by formula (I): ##STR1## wherein R.sub.0 and R.sub.1, which may be the same or different, each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, an alkoxycarbonyl group, an acylamino group, an acyl group, a cyano group, a carbamoyl group, a sulfamoyl group, a carboxyl group, or an acyloxy group; provided that at least one of R.sub.0 and R.sub.1 represents a group other than a hydrogen atom; R.sub.2 represents a hydrogen atom, an alkyl group, or an aryl group; R.sub.3 represents an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyl group, an acyloxy group, an alkoxycarbonyl group, or an acylamino group; provided that when R.sub.3 represents an aryl group, R.sub.0 and R.sub.

Abstract: A process for forming an image comprising heating a heat-developable light-sensitive material comprising a support having thereon at least a light-sensitive silver halide and a high molecular weight compound containing a repeating unit derived from a vinyl monomer having at least one of a group -COOM and a group -SO.sub.3 M wherein M represents a hydrogen atom or an alkali metal atom, simultaneously with or after imagewise exposure thereof in the presence of water and at least one of a base and a base precursor.

Abstract: A light-sensitive material comprising a light-sensitive layer provided on a support wherein the light-sensitive layer contains silver halide, a reducing agent, a polymerizable compound, and an additive compound selected from the group consisting of a 5- or 6-membered nitrogen containing heterocyclic compound, thiourea, a thiourea derivative, a thioether compound, polyethylene glycol and a polyethylene glycol derivative. Thermal image-forming methods utilizing the light-sensitive materials are also disclosed.

Abstract: A process which comprises transferring a dye imagewise formed on a silver halide light-sensitive material comprising a support having thereon a light-sensitive silver halide, a binder and a mobile dye-forming compound which forms a dye in a chemical relation of the compound upon a reduction reaction of the silver halide to silver by a heat development of the light-sensitive material after or simultaneously with an image exposure, into a dye fixing layer in the presence of a thermal solvent at a high-temperature at which the thermal solvent is in a molten state. The process can be conducted without supplying solvent from the outside.

Abstract: A light-sensitive material comprises a support and a light-sensitive layer containing silver halide, a polymerizable compound and a hydrazine derivative. The light-sensitive layer further contains a reducing agent having the following formula (I): ##STR1## in which each of Ar.sup.1 and Ar.sup.2 independently is an aryl group; and each of R.sup.1, R.sup.2 and R.sup.3 independently is a monovalent group such as hydrogen, a halogen atom, an alkyl group, a cycloalkyl, group, an aralkyl group, an aryl group, an alkenyl group, an alkynyl group, a heterocyclic group, an alkoxy group, an alkylthio group and an acylamino group.

Abstract: The present invention relates to an image-forming layer which comprises a polymer having a carboxyl group-containing group which can be decarboxylated by exposure. According to the present invention, an image-forming layer having an improved coating strength and adhesion to a support, can be obtained.

Abstract: Silver sodalites with cages containing anions such as oxalate, formate, halide, carbonate, sulphide etc. have silver compositions entrapped or encapsulated in the cages of a microporous sodalite lattice. The cages of the sodalite lattice have very small but very even sizes e.g. 6.6 A diameters, so that the silver compositions trapped therein are also of very small but very even sizes. The silver compositions may be sensitive to the application of light, and may be sensitive to thermal or pressure stimuli. Thus, images produced by, for example, irradiation of the materials can be of very high resolution. The silver sodalite materials are prepared by a silver ion exchange process, from synthetic sodium sodalites.

Abstract: A thermally processable imaging element having a hydrophobic imaging layer, an adhesion promoting polymer layer and an overcoat layer comprising poly(silicic acid) provides improved adhesion of the overcoat layer during thermal processing. The adhesion promoting layer comprises a terpolymer that promotes adhesion between the hydrophobic imaging layer and the overcoat layer without adversely affecting sensitometric properties of the imaging element. The adhesion promoting layer is useful in photothermographic and thermographic elements and processes.

Abstract: A light-sensitive material comprises a support and a light-sensitive layer containing silver halide, a reducing agent, an ethylenic unsaturated polymerizable compound and a base precursor in the form of a salt of an organic base with a carboxylic acid. The silver halide, reducing agent, polymerizable compound and base precursor are contained in microcapsules which are dispersed in the light-sensitive layer. The organic base of the base precursor is a diacidic to tetraacidic base which is composed of two to four amidine moieties and at least one linking group for the amidine moieties. The linking group is a residue of a hydrocarbon or a heterocyclic ring. The amidine moiety corresponds to an atomic group formed by removing one or two hydrogen atoms from an amidine having the following formula (I): ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.

Abstract: A light-sensitive material comprises a support and a light-sensitive layer containing silver halide, a reducing agent, a polymerizable compound and a base or base precursor. The silver halide, reducing agent and polymerizable compound are contained in microcapsules which are dispersed in the light-sensitive layer. The base or base precursor is arranged outside of the microcapsules. The light-sensitive layer further contains a polar compound having a melting point in the range of 30.degree. to 250.degree. C., which is arranged outside of the microcapsules. The polar compound may be arranged inside and outside of the microcapsules.

Abstract: A silver halide light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, and containing a compound containing a repeating unit, said compound containing a repeating unit being connected at the repeating unit to a compound represented by formula (I) at the position of the PWR or Time moiety:PWR--Time.sub.t PUG (I)wherein PWR represents a moiety capable of releasing (Time.sub.t PUG upon reduction, and PUG represents a group which can fulfil a photographically useful function after the release; Time represents a moiety capable of releasing PUG through a reaction subsequent to the release from PWR in the form of --Time.sub.t PUG; and t represents 0 or 1.

Abstract: A light-sensitive material and an image recording method using the same are disclosed. The material comprises a support having provided thereon a light sensitive layer containing at least a light-sensitive silver halide, a reducing agent, a polymerizable compound, and a color image forming substance, wherein at least the polymerizable compound and the color image forming substance are encapsulated in the same microcapsules. The material exhibits high sensitivity and excellent stability with time.

Abstract: A light-sensitive photohardenable composition comprising a reducing agent, a light-sensitive silver halide, a polymerizable compound, and a coumarin or a ketocoumarin.

Abstract: A light-sensitive material is described, comprising a support having provided thereon a light-sensitive layer containing at least a light-sensitive silver halide, a developing agent, a polymerizable compound, a color image forming substance, and a hydrazine derivative represented by at least one of the following formula (I) and a hydrazine derivative represented by the following formula (II), in which said color image forming substance is immobilized by imagewise exposure to light, followed by heat development under conditions substantially not containing water: ##STR1## wherein R.sub.1 represents a substituted or unsubstituted alkyl, aralkyl, aryl, alkenyl, alkynyl, or heterocyclic group; and R.sub.2 represents a hydrogen atom or a substituted or unsubstituted alkyl, cycloalkyl, aralkyl, aryl, alkenyl, alkynyl, heterocyclic, alkoxy, aryloxy, alkylthio, arylthio, or amino group; ##STR2## wherein R.sub.

Abstract: Dye diffusion images can be produced by a rapid process in which a first sheet material which contains at least one light sensitive silver halide emulsion on a layer support and at least one color producing compound capable of releasing a diffusible dye on development and/or a second, light insensitive sheet material containing a layer of binder in which is incorporated a salt of a weakly acidic organic compound and a strong organic base is or are moistened with an aqueous liquid and the two sheet materials are then heated to 40.degree.-120.degree. C. with their coated surfaces in contact and subsequently separated.

Abstract: In a thermally processable imaging element and process an imaging layer comprising a photothermographic or thermographic imaging composition and 2.5 to 20% by weight of the layer of at least one hydrolyzed polyalkoxysilane (hydrolyzed Si(OR.sub.1).sub.4 or hydrolyzed R.sub.2 --Si(OR.sub.3).sub.3) enables increased maximum image density. Such a hydrolyzed polyalkoxysilane in a hydrophobic imaging layer of such an element enables increased adhesion of the imaging layer to a contiguous hydrophobic hydrophilio layer, particularly a hydrophilic overcoat layer.

Abstract: A photographic silver halide photosensitive material is provided comprising a substantially water-insoluble basic metal compound and a water-soluble salt of the same metal ion as the basic metal compound which inhibits dissolution of the basic metal compound. An image is formed by combining the photosensitive material with a complexing compound in the presence of water and causing complexing reaction of the basic metal compound and the complexing compound to occur, increasing the pH of the system.

Abstract: A heat developable color photographic recording material is improved in its D.sub.min /D.sub.max ratio and sensitivity if it contains a silver halide emulsion in which the grains have at least three zones differing in their silver halide composition.

Abstract: A novel heat-developable light-sensitive material is provided comprising at least one light-sensitive silver halide emulsion layer provided on a support, and further containing an acetylene compound represented by the general formula (I):R.sub.1 --L--C.tbd.C--R.sub.2).sub.n (I)wherein L represents a mere bond or a divalent connecting group; n represents an integer of 1 to 4; R.sub.1 represents a hydrogen atom, a carboxyl group, or a substituted or unsubstituted alkyl group, cycloalkyl group, alkenyl group, alkynyl group, aralkyl group, aryl group, or heterocyclic group when n is 1, and represents a divalent, trivalent or tetravalent residual group when n is 2, 3 or 4; and R.sub.2 represents a hydrogen atom, a carboxyl group, or a substituted or unsubstituted alkyl group, cycloalkyl group, alkenyl group, alkynyl group, aralkyl group, aryloxycarbonyl group, alkoxycarbonyl group, aryl group, heterocyclic group, or carbamoyl group, with the following two provisos: (1) when n is 2, 3 or 4, the plurality of --L--C.

Abstract: Supersensitization of photothermographic silver halide emulsions is effected by the addition of a metal chelating agent to a photothermographic emulsion which is or becomes spectrally sensitized.

Abstract: A positive image forming method is disclosed. Said method comprises in sequence the steps of subjecting to imagewise exposure a silver halide photographic material having a silver halide emulsion layer containing a non-prefogged internal image forming silver halide, increasing the surface sensitivity of said silver halide in the substantial absence of water and performing development.

Abstract: A heat-developable photosensitive material having, on a support, a layer comprising a binder, a light-sensitive silver halide, a reducing agent, and at least one compound selected from cyclic imino compounds or mercapto compounds, which can produce images of high quality by heat development when said light-sensitive silver halide is selected from the group consisting of silver chloride, silver bromide, silver chlorobromide, mixed crystals of silver iodide and silver chloroiodide, mixed crystals of silver iodide and silver iodobromide, and mixed crystals of silver iodide and silver chloroiodobromide.

Abstract: Water-soluble substantially non-hardening aldehydes or water-soluble substantially non-hardening aldehyde precursor compounds are suitable as fog-reducing compounds for the photographic dye diffusion transfer process in which an imagewise-exposed color photographic recording material containing light-sensitive silver salt and a non-diffusing dye-releasing compound in at least one binder layer arranged on a layer support, is developed, preferably under the effect of heat, to produce a diffusible dye image and in which the diffusible dye image is transferred to an image receptor layer.

Abstract: An image-forming process involving a heating step is disclosed, which comprises conducting the heating in the presence of a compound represented by the following general formula (I): ##STR1## wherein: R.sup.1 and R.sup.2, which may be the same or different, each represents a group selected from an aryl group, a substituted aryl group, a heterocyclic group, and a substituted heterocyclic group;R.sup.3 represents a hydrogen atom, an alkyl group, a substituted alkyl group, a cycloalkyl group, a substituted cycloalkyl group, an aralkyl group, a substituted aralkyl group, or a group selected from those which are referred to with respect to R.sup.1 and R.sup.2 ;R.sup.1, R.sup.2, and R.sup.3 may form a ring structure via a hydrocarbon chain, a hetero atom-containing hydrocarbon chain or a hetero atom, or may be directly bound to each other to form a ring structure; andPUG represents a photographically useful group.

Abstract: A light-sensitive material comprises a light-sensitive layer which contains silver halide, a reducing agent, a polymerizable compound and a base or base precursor provided on a support. The silver halide and polymerizable compound are contained in microcapsules to form light-sensitive microcapsules which are dispersed in the light-sensitive layer. The base or base precursor is contained in particles which are arranged outside of the light-sensitive microcapsules. At least 30% of the particles are adsorbed on the surface of the light-sensitive microcapsules.

Abstract: Process for the production of color images by the color photographic dye diffusion process in which development is brought about by heat and water. The combination of antifoggants added to the light-sensitive material, in particular the combination of compounds of formulae I and II, produces a marked improvement in storage stability and constancy of sensitivity with good D.sub.min /D.sub.max ratios. ##STR1## R.sup.1 denotes hydrogen, alkyl with up to 6 carbon atoms, hydroxy, halogen, alkoxy or substituents which together form a condensed benzene ring, and in formula II below: ##STR2## R.sup.2 denotes a group which can be split off in the process of development of the material andR.sup.3 denotes hydrogen, halogen, alkyl with up to 4 carbon atoms, alkoxy, carboxy, carbalkoxy, carbonamido or sulphonamido.

Abstract: A heat-developable photosensitive material comprising (1) a silver halide emulsion, (2) a reducing agent, and (3) a binder on a support can be quickly heat developed to produce images having a high density and less fog by using the silver halide emulsion comprising an emulsion of silver halide grains having a distinct double-layered structure, that is, core/shell structure in the grain interior and an average grain size of at least 0.3 .mu.m in combination with (4) a specific compound of formula (I) or (II).

Abstract: A thermally developable light-sensitive material is disclosed that the said material has at least one light-sensitive silver halide containing layer on a support and which further contains a compound represented by the general formula (I):X (J.sub.m F).sub.n (I)wherein X is the residue of the development restrainer; J is a divalent linkage; F is an immobilizing group that is capable of reducing the diffusibility of the compound of formula (I) or a silver salt or silver complex thereof during thermal development; m is 0 or 1; and n is an integer of 1 to 3.

Abstract: Photothermographic elements of the dry silver type may be sensitized to the infrared with sensitizing dyes of the formula: ##STR1## in which: R.sup.1 represents a lower alkyl group of from 1 to 5 carbon atoms andX.sup.- represents an anion.

Abstract: A method for forming an image, which comprises heating a light-sensitive material in the presence of a compound capable of forming a 2-mercaptobenzazole ring by a ring closing reaction when heated.In accordance with the method of the present invention, development is stopped at an appropriate time of development whereby an image having a high maximum density and low fog is obtained.A heat-developable light-sensitive material containing the compound is also disclosed.

Abstract: In a photographic element amenable to heat development or mobile dye heat transfer, an electroconductive layer is formed from a composition containing an electroconductive substance, typically carbon black, a hydrophilic binder, typically gelatin, and a water-insoluble compound having a melting point of up to 120.degree. C. and a boiling point of at least 175.degree. C., for example, trinonyl phosphate, such that the conductive layer undergoes a minimized change in electric resistance when folded.

Abstract: Compounds of the formula I are suitable as thermal development and diffusion promoting agents for the heat development process. With the aid of said compounds higher color transfer densities can be achieved and/or the development time can be shortened. ##STR1## wherein X.sub.1 denotes --SO.sub.2 -- or--CO--;R.sup.1 to R.sup.4 denote alkyl, cycloalkyl, aralkyl or aryl;R.sup.5 and R.sup.6 denote acyl or a group as defined for R.sup.1 to R.sup.4 ; and R.sup.1 together with R.sup.5, R.sup.2 together with R.sup.6, R.sup.3 together with R.sup.4 and/or R.sup.1 together with R.sup.2 may in each case form a heterocyclic ring containing at least one nitrogen atom.

Abstract: In a photographic element amenable to heat development or mobile dye heat transfer, an electroconductive layer is formed from a composition containing an electroconductive substance, typically carbon black and a high molecular weight compound having a glass transition temperature of not higher than 40.degree. C. at a relative humidity of 20% or a melting point of not higher than 180.degree. C., for example, polyethylene glycol, such that the conductive layer undergoes a minimized change in electric resistance when folded.

Abstract: In a heat developable color photographic recording material containing, in a common layer of binder, a light-sensitive silver halide, optionally combined with a substantially light-sensitive silver salt, and a non-diffusible dye releasing compound, the binder of the said layer consists to an extent of at least 30% by weight of a polyurethane containing anionic groups. The recording material has a considerably increased sensitivity combined with improved D.sub.min /D.sub.max relationship.

Abstract: A light-sensitive material comprising a light-sensitive layer which contains silver halide, a reducing agent and a polymerizable compound and a layer containing a base or base precursor, both of which are provided on the same side of a support. A barrier layer which keeps the base or base precursor from the light-sensitive layer and, when heated, allows transmission of the base or base precursor therethrough can be provided between the light-sensitive layer and the layer containing a base or base precursor.

Abstract: A light-sensitive material is described, comprising a support having provided thereon a light-sensitive layer containing at least a light-sensitive silver halide, a polymerizable compound, a color image forming substance, and a hydrazine derivative represented by formula (I): ##STR1## wherein R.sub.1 represents a monovalent group derived from a substituted or unsubstituted aromatic ring or aromatic heterocyclic ring; R.sub.2 and R.sub.3 each represents a substituted or unsubstituted aryl group; and R.sub.4 represents a hydrogen atom or a substituted or unsubstituted alkyl, aryl, alkoxycarbonyl, or carbamoyl group,in which the color image forming substance is immobilized by imagewise exposure to light followed by heat development under conditions substantially not containing water. The material exhibits high sensitivity and provides a color image through a simple, easy, and rapid dry processing step, with a reduced exposure time.

Abstract: A method for forming an image comprising heating in the presence of at least one of a base and a base generating agent, a heat-developable color light-sensitive material which comprises a support having thereon at least: (1) a light-sensitive silver halide, (2) a coupler capable of coupling with an oxidation product of a developing agent, (3) a hydrophilic binder, and (4) at least one compound represented by formula (Z) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, a hydroxy group, an amino group, a substituted amino group, an alkoxy group, an acylamino group, an alkylsulfonylamino group, an arylsulfonylamino group, an aryl group, a carbamoyl group, a substituted carbamoyl group, a sulfamoyl group, a substituted sulfamoyl group, an acyl group, an acyloxy group, or an alkoxycarbonyl group, or R.sub.1 and R.sub.2, or R.sub.3 and R.sub.

Abstract: An imaging material comprising a support and a layer of photosensitive microparticles on one surface of said support, said microparticles including an image-forming agent and a photosensitive composition containing a polymer which is capable of undergoing cationically-initiated depolymerization and a photoinitiator including a silver halide and an organo silver salt, wherein, after exposing said microparticle to radiation, said microparticles, directly or with additional processing, release said image-forming agent or become permeable to a developer which reacts with said image-forming agent to form a visible image.

Abstract: Radiation sensitive thermally developable imaging elements comprise:(a) photosensitive silver halide,(b) light insensitive silver salt oxidizing agent,(c) reducing agent for silver ions, and(d) a benzoyl acid class of antifoggant.The antifoggants are effective in both reducing spurious background image densities and in stabilizing the film against sensitometric changes during storage.

Abstract: The present invention provides silver halide photographic materials containing a havel compound, which when reduced, releases a photographically useful group as triggered off by the cleavage of the nitrogen-oxygen single bond in the compound and which is represented by the following general formula (I): ##STR1## wherein EAG represents a group which accepts an electron from a reducing substance; N and O each represents nitrogen atom and an oxygen atom, respectively; R.sup.1 and R.sup.2 each represents a substituent other than a hydrogen atom, and when R.sup.1 or R.sup.2 is bonded to --(Time).sub.t PUG, R.sup.1 or R.sup.2 is a mere bond or a substituent other than a hydrogen atom, and R.sup.1 and R.sup.

Abstract: A heat-developable photosensitive material comprising at lesat (1) a photosensitive silver halide, (2) a binder, (3) a dye-providing substance, and (4) a specific reducing agent other than commonly used reducing agents for silver halide on a support can be heat developed to produce images having a high density and less fog and has improved shelf stability.

Abstract: A heat developable color photographic material is disclosed. The color photographic material is comprised of a support having thereon a light-sensitive mixed crystal silver haloiodide having a silver iodide content of 4 to 40 mole %, a binder and a dye-providing substance capable of providing a mobile dye, when the silver haloiodide is reduced to silver by heating, in chemical relation to the reaction. The color photographic material is capable of producing an image by quick development in a substantially water free state. Even when the color photographic material is used in combination with an organic silver salt it is capable of providing excellent color sensitivity.

Abstract: A heat-developable photographic element containing a light-sensitive silver halide and a binder on a support, and in addition, a base precursor and a photographic reagent capable of releasing a compound represented by the general formula (I) by reaction with a base in a light-sensitive layer and/or an image receiving layer. ##STR1## wherein Y is an atomic group necessary for forming a 5-, 6- or 9-membered heterocyclic ring.The photographic material has excellent temperature compensation capability and low fog.