Abstract: A silver halide photographic emulsion, wherein at least 70% of the total projected area of silver halide grains contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver chloride content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as CL mol %, a silver chloride content of each epitaxial protrusion portion of each grain falls within the range of 0.7 CL to 1.3 CL.

Abstract: The present invention relates to a method for preparing a silver halide photographic emulsion, comprising the steps of a) providing a nucleation medium comprising an aqueous composition based on a hydrophilic colloid and a non-ionic antifoaming agent; b) precipitating silver halide nuclei in said nucleation medium; c) growing said silver halide nuclei to form a silver halide photographic emulsion; and d) removing the non-ionic antifoaming agent from the nucleation medium by contacting the silver halide photographic emulsion resulting from step c) with a material that has surface lipophilic functions.

Abstract: A process for producing a silver halide emulsion is disclosed, which comprises disposing a mixer equipped with a first channel and a second channel brought into partial contact therewith; and allowing a silver salt solution (Fluid 1) and a halide solution (Fluid 2) to pass through said first channel and said second channel, respectively, to thin said two fluids into lamellae having an open interface therebetween and having a thickness of 1 to 500 &mgr;m in a normal line direction on the contact interface, thereby inducing diffusion, transfer and reaction of silver ions and halogen ions between said two thin layers, and thus forming silver halide grains continuously.

Abstract: A producing method of a silver halide emulsion comprising the steps of adding silver halide fine grains AgX0 having an to a silver halide seed crystal emulsion containing at least water, dispersion medium 1 and silver halide crystal, and growing the seed crystal by dissolving the added AgX0, wherein AgX0 are formed in dispersion medium solution 2 containing dispersion medium 2, the pH of dispersion medium solution 2 of the time when AgX0 are formed is from 7.3 to 12.2, the average equivalent-circle projected area diameter of AgX0 is from 0.001 to 0.2 &mgr;m, and AgX0 are non-twin crystal grains not substantially having twin planes.

Abstract: A silver halide emulsion is disclosed, comprising tabular grains having dislocation lines in the fringe portion, the tabular grains comprising a silver halide phase (V3) having a maximum iodide content, a silver halide phase (V6), internal to V3, having an average iodide content of A6 mol %, and a silver halide phase (V7), external to V3, having an average iodide content of A7 mol %, and 0≦A6/A7≦1.0; and wherein the dislocation line forming region comprises a shell accounting for 10 to 50% by volume of the grain and having an average iodide content of 4 to 20 mol %; the shell comprising an outermost sub-shell accounting for to 15% by volume of the grain and having an average iodide content of 0 to 3 mol %.

Abstract: A process of sensitizing a tabular grain emulsion containing the steps of (i) providing a tabular grain host emulsion comprised of a dispersing medium and silver halide grains including tabular grains having {111} major faces and an aspect ratio of at least 2, which contain greater than 50 mole percent bromide, based on silver, and which account for greater than 50 percent of total grain projected area; (ii) adding a thiosulfonate compound of the following Formula I at the surface of the tabular grains of the host emulsion: Z1SO2SZ2  (I) where Z1 represents is a substituted or unsubsituted aliphatic, aromatic, or heterocyclic group, and Z2 represents a substituted or unsubsituted aliphatic, aromatic, or heterocyclic group, or a monovalent metal or organic cation, where Z1 and Z2 may combine together to form a ring structure or either of Z1 or Z2 may comprise a polymeric backbone wherein the thiosulfonate group may be repeated; and (iii) adding silver and halide ions, where the halide

Abstract: In the apparatus for liquid preparation, the silver halide emulsion contained in a dedicated pot is transferred as liquid by a mohno pump via a piping into a measuring tank. The silver halide emulsion transferred into the measuring tank is measured with a load cell and is melted by heating with a jacket while being stirred by a stirrer. Accordingly, even when a small amount is used as in the case of the silver halide emulsion used in the heat-developable photosensitive material, the time for heating the silver halide emulsion, within the time range from the liquid preparation of the silver halide emulsion to its utilization, can be made short to the utmost, and hence the time elapse in melt can be suppressed. Thus, the time elapse in melt, reagent loss, and mutual contamination in the liquid preparation of photographic reagents can be effectively prevented.

Abstract: A silver halide photographic emulsion is disclosed, comprising silver chloroiodide grains or silver chloroiodobromide grains, having 90 mol % or more of a silver chloride content, wherein the silver chloroiodide grains or silver chloroiodobromide grains have a layer having a silver iodide content of decreasing in the depth direction from the grain surface.

Abstract: Silver halide emulsions are disclosed comprising tabular silver halide grains containing dislocation lines in the peripheral region of the major faces; the tabular grains comprising a high iodide phase which is internal to and along the dislocation lines and an internal region which is surrounded by the high iodide phase and comprised of substantially homogeneous silver halide phase and having an average iodide content of not more than 1 mol %. Silver halide photographic materials by the use of the emulsion are also disclosed.

Abstract: The present invention provides a silver halide photographic material that is excellent in photographic speed as well as image graininess and exhibits low residual color even after rapid processing. The silver halide photographic material contains a compound represented by formula (I) and a compound represented by formula (II), as defined.

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing (i) a first dopant comprising an iridium coordination complex containing at least one thiazole ligand and (ii) a second dopant comprising an iridium coordination complex containing at least one substituted thiazole ligand. The combined use of first and second iridium dopants in accordance with the invention provides enhanced toe contrast softening, and can also result in improved latent image keeping stability relative to that expected from the individual effects of such dopants.

Abstract: A process for the treatment of a photographic material particularly a high speed photographic material, comprising an emulsion containing silver halide grains the treatment being to reduce the sensitivity of the material to ionizing radiation comprises prior to exposure, subjecting the material to a treatment that reduces the surface image dispersity so that fewer centers develop on each grain. The process may involve subjecting the photographic emulsion to physical pressure to deform the grains to introduce internal trapping centers for latent image formation so that a proportion of the latent image can be formed within the grains rather than on the grain surface.

Abstract: A method has been described for preparing an ultrathin tabular grain emulsion rich in silver bromide, having {111} major faces, wherein tabular grains having a thickness of less than 0.08 &mgr;m exhibit an average aspect ratio of more than 5:1 and account for at least 75% by number of hexagonal grains and a coefficient of variation on average equivalent surface area of less than 0.50. The process is characterized in that during formation, (a) pH is maintained from 0.8 to 10; (b) a gelatino-peptizer is present in a concentration of 0 to 50 g per liter of dispersing medium, and (c) pBr having a value of at least 1.8 is maintained during grain nucleation and pBr is maintained at less than 2.4 during growth provided that a gelatin peptizer which is free from calcium ions and has a methionine content of less than 30 micromoles per gram of gelatino-peptizer is present.

Abstract: A silver halide emulsion is disclosed, comprising tabular silver halide grains having an average iodide content of 3 to 15 mol % and comprising silver halide phases differing in halide composition, at least 50% of the total projected area of the tabular silver halide grains being accounted for by grains having an aspect ratio of not less than 12, wherein the first silver halide phase (A) has an average iodide content of not more than 3 mol % and accounting for 50 to 85% of total silver, the second phase (B) locating outside the phase (A), having an average iodide content of 8 to 25 mol % and accounting for 10 to 35% of total silver, and the third outermost phase having an average iodide content of not more than 4 mol % 0.5 to 15% of total silver.

Abstract: A silver halide photographic emulsion in which tabular grains each having an equivalent-circle diameter of 0.6 &mgr;m or more, a thickness of 0.3 &mgr;m or less, and an aspect ratio of 2 or more account for 70% or more in number of all the grains contained therein, wherein each of the tabular grains has a multilayered structure including two or more layers, at least one of the layers contains 1 to 20 mol % of a chloride with respect to the silver amount contained in the at least one of the layers, and each of the tabular grains contains a metal complex represented by formula (C-1) or (C-2) below: [M1(CN)6-aLa]n  (C-1) [M2(CN)4-bLb]m  (C-2) wherein M1 represents Fe, Ru, Re, Os, Ir, or Pt; M2 represents Pt or Au; L represents a ligand except for CN; a represents 0, 1, or 2; b represents 0, 1, or 2; n represents 2-, 3-, or 4-; and m represents 1- or 2-.

Abstract: Disclosed is a silver halide photographic emulsion which comprises silver halide particles containing a polynuclear metal complex in which an organic compound is contained as a bridging ligand, wherein 50% or more of a projected area of the particles is occupied by tabular particles having a particle thickness of 0.3 &mgr;m or less. This photographic emulsion is high in sensitivity, as well as give high contrast and good graininess. Also disclosed are a light-sensitive material for photographing of high image quality, which contains the photographic emulsion, and a simple method for forming a color image wherein the light-sensitive material is used.

Abstract: A silver halide photographic emulsion comprising silver halide grains is disclosed, which is obtained through a process including at least one step of forming grains using a dispersion medium having a low viscosity, wherein 50% or more of the entire projected area of all silver halide grains in the emulsion is occupied by silver halide tabular grains having an aspect ratio of 4 or more and a twin plane spacing of 0.012 &mgr;m or less. Further disclosed is a silver halide color photographic light-sensitive material using the emulsion.

Abstract: A silver halide emulsion is disclosed, comprising silver halide grains which each have a host tabular grain part and a part grown on the outside thereof, wherein in said host tabular grains parts, at least 50% of total projected area of the silver halide grains are accounted for by silver halide tabular grains having {111} main surfaces, and said silver halide grains comprises the main surface of the host tabular grain part subjected to junction with high-iodide epitaxial phases comprising silver halide containing at least 97 mole % of silver iodide and the lateral face of the host tabular grain part comprises silver halide having an iodide content of substantially 5 mole % or below; and a method of preparing a silver halide photographic emulsion is disclosed, comprising silver halide grains which each have a host tabular grain part and a part grown on the outside thereof.

Abstract: Variation of charged amount accompanying production amount change does not affect photograph performance, a flexible production of an optimal amount corresponding to commercial scene needs may be performed, and a silver halide emulsion having monodispersibility may be produced with sufficient productivity. In the first line a series of continuous operations are performed that a silver salt aqueous solution, a halide salt aqueous solution, and a hydrophilic dispersion medium aqueous solution are mixed and reacted to generate silver halide grain nuclei, and a mother liquor containing the silver halide grain nuclei is stored in cooled state until a amount of production reaches a desired production amount of a silver halide emulsion.

Abstract: A silver halide photographic emulsion which contains silver halide grains having light absorption strength of 100 or more.

Abstract: A silver halide photographic lightsensitive material comprises at least one lightsensitive silver halide emulsion layer on a support. The lightsensitive material exhibits a speed at 3×10−9 sec exposure time being lower than a speed at 10−5 sec exposure time by 30 or more in terms of speed unit.

Abstract: A silver halide photographic emulsion containing silver halide grains. A variation coefficient of distribution of equivalent circle diameters of all the silver halide grains of the silver halide photographic emulsion is 40 to 3%. The silver halide photographic emulsion and contains tabular grains, which satisfy the following requirements (i) to (iv), in an amount of 50% or more of the total projected area of the silver halide grains: (i) silver bromoiodide or silver bromochloroiodide tabular grains having (111) faces as main planes, (ii) the equivalent circle diameter is 1.0 &mgr;m or more and a thickness is 0.10 &mgr;m or less, (iii) ten or more dislocation lines per grain are present at a fringe portion of the grain, and (iv) when the grain is viewed from a direction perpendicular to the (111) main plane, it has a hexagonal or triangular shape whose edge and/or corner are partly substantially hollowed.

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I) and a second dopant of Formula (II): [RuL6]n  (I) wherein n is zero, −1, −2, −3 or −4, and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; [TE4(NZ)E′]r  (II) wherein T is Os or Ru; E4 represents bridging ligands which can be independently selected; E′ is E or NZ; r is zero, −1, −2 or −3; and Z is oxygen or sulfur; wherein the dopant of Formula (II) is selected from hexacoor

Abstract: This invention comprises a multicolor photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said layers comprises large tabular grains having an average circular diameter of greater than 2 &mgr;m and contains a fragmentable electron donating compound is of the formula: X—Y′ or a compound which contains a moiety of the formula —X—Y′; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a pr

Abstract: A process for producing a silver halide emulsion is disclosed, which comprises disposing a mixer equipped with a first channel and a second channel brought into partial contact therewith; and allowing a silver salt solution (Fluid 1) and a halide solution (Fluid 2) to pass through said first channel and said second channel, respectively, to thin said two fluids into lamellae having an open interface therebetween and having a thickness of 1 to 500 &mgr;m in a normal line direction on the contact interface, thereby inducing diffusion, transfer and reaction of silver ions and halogen ions between said two thin layers, and thus forming silver halide grains continuously.

Abstract: Preparation method of a silver halide emulsion is disclosed, in which the silver halide emulsion contains tabular grains having a mean equivalent circle diameter of 0.1 to 10.0 &mgr;m, a mean grain thickness of 0.01 to 0.3 &mgr;m and an aspect ratio of 1.5 to 300, the emulsion is prepared by a process comprising: (a) forming the tabular silver halide grains in the presence of fine silver halide grains containing at least a metal selected from the group of indium, gallium and metals in Groups 8, 9 and 10 of the periodical table and (b) subjecting the tabular silver halide grain emulsion to ultrafiltration to remove a salt-containing solution from a reaction mixture solution in the growth process of the tabular grains.

Abstract: This invention relates to a multicolor silver halide photographic element comprising a support and at least one high bromide silver halide emulsion layer comprising low fogging tabular silver halide grains, said element further comprising an antifoggant represented by the following Structure I: R1—SO2—C(R2)R3—(CO)m—(L)n—SG  I wherein R1 is an aliphatic or cyclic group, R2 and R3 are independently hydrogen or bromine as long as at least one of them is bromine, L is a divalent linking group, m and n are independently 0 or 1, and SG is a solubilizing group that has a pKa of 8 or less.

Abstract: A method of imaging employing sensitized high chloride silver halide emulsions which exhibit improved speed and high intensity reciprocity performance for use with short duration, high intensity exposure optical and digital exposure systems. The method comprising providing a photographic element comprising at least one high chloride silver halide emulsion layer, exposing said element utilizing a high intensity actinic radiation exposure for an exposure time of less than {fraction (1/100)} second, and developing said element to produce a photographic image, wherein the high chloride silver halide emulsion layer is comprised of silver halide emulsion grains containing at least 90 mole percent chloride, based on silver, obtained by providing a high chloride host emulsion, bringing a Lippmann emulsion comprising primarily fine silver bromide grains doped with iridium into contact with said high chloride host emulsion, and subsequently chemically sensitizing the high chloride emulsion.

Abstract: A multicolor photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said silver halide emulsion layers contains a tabular grain silver halide emulsion having a halide content of at least 95% bromide and less than about 5% iodide, said iodide being substantially uniformly distributed in the silver halide grains of said emulsion, and said emulsion is sensitized with a fragmentable electron donor of the formula X—Y′ or an electron donor which contains an —XY′ moiety; wherein

Abstract: A radiation-sensitive emulsion comprised of an aqueous dispersing medium and a coprecipitated grain population including tabular grains containing greater than 50 mole percent bromide, based on silver, having {111} major faces, and accounting for greater than 90 percent of total grain projected area, wherein said dispersing medium is comprised of (a) a gelatin which has been modified to convert at least one carboxylic acid group thereof to a group that does not exhibit pH-dependent ionization within the pH range from 4.0 to 7.0, and (b) a polyalkylene oxide block copolymer surfactant.

Abstract: The invention relates to an emulsion comprising chemically and spectrally sensitized silver halide grains having formate on the surface of said grams.

Abstract: This invention comprises a photographic element comprising a support and at least one blue sensitive silver halide emulsion layer containing a tabular grain silver halide emulsion, or an emulsion in which the halide content is at least 50% chloride and no more than 5% iodide, wherein the emulsion is spectrally sensitized with at least one dye providing a peak sensitization between 446 and 500 nm and at least one dye providing a peak sensitization between 400 and 445 nm and additionally sensitized with a fragmentable electron donor of the formula: X—Y′. or an electron donor which contains an —XY′ moiety; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is H a base, &bgr;−, is covalently linked directly or indirectly to X. and wherein: 1) X—Y′ has an oxidation potential between 0 and about 1.

Abstract: A method for the preparation of silver haloiodide photographic emulsions, in particular the preparation of tabular grains haloiodide photographic emulsions. The method comprises the steps of adding pulsed jets of iodide salt and silver salt to a host emulsion.

Abstract: A silver halide photographic emulsion comprising grains, wherein 50% or more (numerical ratio) of all the grains are occupied by tabular grains meeting the requirements (i) to (iii):

Abstract: The present invention relates to a method for preparing a silver halide photographic emulsion, comprising the steps of

Abstract: A black-and-white silver halide photographic material has been disclosed, coated on a support with at least one light-sensitive emulsion layer, comprising a spectrally sensitized prefogged direct-positive silver halide emulsion, providing peak absorption in the wavelength range from 600 nm up to 700 nm, wherein said emulsion comprises a binder and core-shell emulsion crystals having silver bromide in a total amount of at least 80 mole %, characterized in that said emulsion is spectrally sensitized with a combination of a desensitizing dye having an absorption maximum wavelength in a range from 600 nm up to 700 nm, if present as a sole dye in said emulsion, and at least one azacyanine dye having an absorption maximum at a more hypsochromic wavelength.

Abstract: A silver halide photographic material is disclosed, comprising a support having provided thereon at least one silver halide emulsion layer, wherein the silver halide emulsion layer contains, in the dispersion medium phase of the emulsion, one or more kinds of inorganic fine particles having a refractive index the total weight of the fine particles contained in the unit volume of the dispersion medium phase is from 1.0 to 95 wt %, the dispersion medium phase containing the fine particles is substantially transparent to the photosensitive peak wavelength light of the emulsion layer, and the photographic material is exposed and processed in the development process comprising at least a developing step and a fixing step.

Abstract: A radiation-sensitive emulsion comprised of an aqueous dispersing medium and a coprecipitated grain population including tabular grains containing greater than 50 mole percent bromide, based on silver, having {111} major faces, and accounting for greater than 90 percent of total grain projected area, wherein said dispersing medium is comprised of (a) a gelatin which has been modified to convert at least one carboxylic acid group thereof to a group that does not exhibit pH-dependent ionization within the pH range from 4.0 to 7.0, and (b) a polyalkylene oxide block copolymer surfactant.

Abstract: A silver halide emulsion comprises silver halide grains. The variation coefficient of equivalent-circle diameters of all the silver halide grains is 40% or less.

Abstract: A method of making a monodisperse regular grain silver halide high bromide emulsion is described comprising precipitating regular silver halide grains comprising greater than 50 mole percent bromide, based on total silver, in a reaction vessel, and adding to the reaction vessel before or during precipitation a disulfide compound represented by the following formula (I): where Y and Z are H atoms or substituents, which may be connected to form a carbocyclic or heterocyclic ring, X is —O—, —NH— or —NR—, where R is a substituent; M is —H— or a cationic species; and L is a linking group, where p is 0 or 1. The invention further provides a silver halide emulsion prepared by the method, and a photographic element comprising a silver halide emulsion prepared by the method.

Abstract: A method of making a monodisperse regular grain silver halide high bromide emulsion is described comprising precipitating regular silver halide grains comprising greater than 50 mole percent bromide, based on total silver, in a reaction vessel, and adding to the reaction vessel before or during precipitation a disulfide compound represented by the following formula (I): 1

Abstract: Provided is a photothermographic material having, on one surface of its support, at least one type of photosensitive silver halide grains, a non-photosensitive silver salt of an organic acid, a reducing agent for silver ions, and a binder; which contains a compound of the following general formula (I) and in which the silver halide grains have a hexacyano-metal complex of the following general formula (II) in their outermost surfaces: wherein R11, R12, R13 and R14 may be the same or different, and each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group, a carboxyl group or its salt, a sulfo group or its salt, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, or a group of R15—D—; where R15 represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group a carboxyl group or its salt, a sulfo group or its salt, an alkyl group, an alk

Abstract: A silver halide photographic light-sensitive emulsion containing, at a ratio of 50% or more of the total projected area of silver halide grains, tabular silver halide grains each having faces as parallel major faces and an aspect ratio of 2 or more and including 10 or more dislocation lines per grain, and containing at least one compound represented by formula (1) or (2) below: wherein A represents an atomic group required to form a nitrogen-containing hetero ring, each of B and E independently represents a divalent group containing at least one divalent group selected from the group consisting of alkylene, arylene, —O—, —S—, —SO2—, —CO2—, and —N(R5)-, wherein R5 represents a hydrogen atom, an alkyl group, or an aryl group, provided that each of —O—, —S—, —SO2—, —CO2—, and —N(R5)- is adjacent to and connects with alkylene or arylene, and that B does not bond to the nitrogen atom which

Abstract: Photothermographic imaging materials having increased photospeed are provided by certain tellurium chemical sensitizers that are added during the formulation of a photothermographic emulsion.

Abstract: A light-sensitive silver halide photographic film material has been provided, said film material comprising a transparent support and on both sides thereof at least one light-sensitive emulsion layer having spectrally and chemically sensitized tabular silver halide grains rich in silver bromide, further having silver iodide in an amount of less than 3 mole % based on silver, with two flat parallel {111} crystal faces, said grains accounting for a total projective surface of said parallel crystal faces in said emulsion of at least 50%, further having an average aspect ratio of at least 2:1, a grain thickness of from 0.05 up to 0.

Abstract: A silver halide emulsion comprising tabular grains having a very small thickness with the main surfaces thereof having a very large surface area and being (111) face, is disclosed.

Abstract: A silver halide photographic emulsion comprises silver iodochlorobromide tabular grains each having (111) faces as main planes thereof. 70% or more of the total projected area of all the grains contained in the emulsion is occupied by grains each meeting conditions (i) to (iv): (i) a hexagonal tabular grain whose ratio of the length of an edge having the maximum length with respect to the length of an edge having the minimum length, is 2 or less; (ii) an epitaxial junction portion having a silver chloride content of 5 mol % or more and 25 mol % or less, is provided on at least one apex portion of the hexagon; (iii) a silver chloride content thereof is 0.5 mol % or more and 6 mol % or less; and (iv) a silver iodide content thereof is 0.5 mol % or more and 10 mol % or less.

Abstract: An apparatus and method for mixing at least two reactants is taught wherein a first reactant is delivered to a reaction zone through a first annular flow path and a second reactant is delivered to the reaction zone through a second annular flow path. The first and second annular flow paths are concentric with one another and the two reactants intermix with one another in the reaction zone. There is a rotating disc having a surface, defining one boundary of the reaction zone. The flow of the first and second reactants across the rotating disc and through the reaction zone is generally radial and has a residence time in the reaction zone of not more than about 100 msec, and preferably not more than about 50 msec. The reaction zone resides in a main reactor vessel and there is a driven agitator residing in the main reactor vessel to stir the contents thereof.

Abstract: A photosensitive element including a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment the dopant is represented by formula (I): R—COOM  (I) wherein R is hydrogen, an alkyl group, an aryl group, an aralkyl group or hetero-aryl group, and M is hydrogen or any metal or organic group which can form a salt or by formula (II):  wherein: X and Y are independently selected from O, S, Se, m is 1 and n is 1 or 2, R1 and R2 are hydrogen, an alkyl group, an aryl or aralkyl group or a heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring, E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair, M+ is a proton or an organic or inorganic (metal) counterion. Moreover a photosensitive element is provided where the photosensitive element can be a photoaddressable thermographic element.

Abstract: A silver halide emulsion is disclosed, comprising silver halide grains, wherein a variation coefficient of grain diameter of the whole silver halide grains is not more than 25%, wherein at least 50% of the total grain projected area is accounted for by tabular grains having two twin planes and an aspect ratio of not less than 6 and meeting the following requirement, 1.0≦b/a≦1.3. Photographic materials containing the silver halide emulsion is also disclosed.