摘要:
A silver halide photographic element comprises at least one silver halide emulsion layer comprising a silver halide emulsion comprising core/shell silver halide grains wherein the core region comprises silver bromide with from about 5 to about 20% silver iodide and the shell region comprises silver bromide with about 0.1 to about 10% silver iodide and said layer contains a fragmentable electron donor compound 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 proton, a base, beta , is covalently linked directly or indirectly to X, and wherein: 1) X-Y' has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X-Y' undergoes a bond cleavage reaction to give the radical X and the leaving fragment Y'; and, optionally, 3) the radical X has an oxidation potential ≤-0.7V.an
摘要:
A compound represented by the general formula I R1, R2, R4, and R5 each represents alkyl or aryl, or R1 and R2 and/or R4 and R5 may be bonded to each other to form a ring R3 represents hydrogen or sulfo R6, R7, R8, and R9 each represents hydrogen, halogeno, alkyl, alkoxy, amino, nitro, or cyano X1 and X2 each represents alkyl or aryl m1 to m3 each is 0 or 1 L1 to L7 each represents methine, provided that when two or more of the methines each has a substituent, then the substituents may be bonded to each other to form a ring M represents hydrogen, a metal, or a quaternary ammonium salt and n is an integer of 1 to 7 necessary for charge neutralization or a salt of the compound. They are usable as a novel cyanine dye useful as an infrared-sensitive dye which exerts no adverse influence on the photographic properties of a photographic emulsion and is reduced in residual color after development.
摘要:
An imaging element comprising at least one silver halide emulsion wherein the silver halide emulsion grains incorporate dopant (i) which comprises a hexacoordination metal complex which satisfies the formula ÄML6Ü wherein n is zero, -1, -2, -3 or -4; M is a filled frontier orbital polyvalent metal ion, other than iridium; and L6 represents bridging ligands which can be independently selected, provided that 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; and wherein the emulsion has been spectrally sensitized with a sensitizing dye and contains a filter dye that (a) has a wavelength of absorbance maximum which is less than about 15 nm different than the maximum wavelength of emulsion sensitivity provided by the spectral sensitizing dye, and (b) has a half band width that is approximately equal to the half bandwidth of the sensitizing dye, thereby resulting in an emulsion which has a sensitivity at a wavelength of about 50 nm shorter than the maximum wavelength of sensitization which is about 65% or greater of the emulsion speed at the maximum wavelength of spectral sensitivity.
摘要:
This invention comprises a photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula X-H, wherein X is an electron donor moiety to which a base, B-, is covalently linked and H is a leaving hydrogen atom, and wherein: 1) X-H has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X-H undergoes deprotonation reaction with the base B-, to give the radical X. and the protonated base B-H. In a preferred embodiment of the invention, the radical X. has an oxidation potential
摘要:
A radiographic screen/film combination or system has been provided comprising a duplitized film sandwiched between a pair of supporting or self-supporting X-ray intensifying screens, characterized in that i) said pair of supported or self-supporting X-ray intensifying screens essentially consists of luminescent phosphor particles emitting at least 50 % and more preferably at least 80 % of their emitted radiation in the wavelength range shorter than 380 nm, as e.g. a niobium and gadolinium doped, monoclinic M, yttriumtantalate (MYT) phosphor corresponding to formula I YTaO4:Gd:Nb ii) said film comprises (1111 tabular silver halide grains rich in silver chloride, spectrally sensitive to irradiation in the said wavelength range shorter than 380 nm by the presence of at least one azacyanine dye as a spectral sensitizer.
摘要:
This invention relates to an imaging element comprising a dye represented by Formulae II and IIA below: wherein; R 1 represents a hydrogen, an aryl group containing 6 to 14 carbon atoms, or an alkyl group containing 1 to 12 carbon atoms; R 2 and R 3 together form an aromatic carbocyclic or heterocyclic ring system containing 6 to 14 atoms; X represents a sulfoxidc (S=O), sulfone (SO 2 ), carbonyl (C=O) or dicyanovinyl (C(CN) 2 ) group, and Y represents a sulfoxide (S=O), sulfone (SO 2 ), carbonyl (C=O) or dicyanovinyl (C(CN) 2 ) group, with the proviso that X and Y cannot both be carbonyl; L 1 , L 2 , and L 3 represent methine groups, wherein the methine groups may combine to form a 5- or 6-membered ring when m is equal to or >1; m is 0, 1, 2, or 3; W is an aryl group; and D is a moiety in conjugation with the X and Y groups.
摘要:
A process for preparing a concentrated photographic spectral sensitizing dye-water composition which comprises adding an anionic sensitizing dye to an aqueous medium in the substantial absence of organic solvent, and agitating the combined dye and aqueous medium, wherein the anionic dye forms a liquid-crystalline dye phase in the aqueous medium and the agitation is performed in the presence of a nonionic surfactant having an HLB of less than 12 and an aqueous solubility at 25°C of greater than 10 ppm, which nonionic surfactant is in the aqueous medium at a level of from 10 to 1000 ppm. In a specific embodiment of the invention, where the viscosity (at 0.1 s -1 shear rate) of the dye-water composition in the absence of the nonionic surfactant would be greater than 100 cp and especially where such viscosity would be greater than 500 cp, the surfactant is preferably present at a level sufficient to substantially reduce air entrainment during agitation of the dye-water composition.
摘要:
Disclosed is a silver halide photographic light-sensitive material comprising at least one silver halide emulsion layer on a support, wherein 40 mol % or more of silver halide contained in the silver halide emulsion layer is silver bromide and the silver halide contains 1 × 10 -6 mole or more per mole of silver of a metal complex containing one or more cyanide ligands, and the silver halide photographic light-sensitive material has a characteristic curve drawn in orthogonal coordinates of logarithm of light exposure (x-axis) and optical density (y-axis) using equal unit lengths for the both axes, on which gamma is 4.0 or more for the optical density range of 0.1-1.5. There is provided a silver halide photographic light-sensitive material showing high contrast and high sensitivity.
摘要:
An imaging element comprising at least one silver halide emulsion wherein the silver halide emulsion grains incorporate dopant (i) which comprises a hexacoordination metal complex which satisfies the formula[ML 6 ] n wherein n is zero, -1, -2, -3 or -4; M is a filled frontier orbital polyvalent metal ion, other than iridium; and L6 represents bridging ligands which can be independently selected, provided that 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; and wherein the emulsion has been spectrally sensitized with a sensitizing dye and contains a filter dye that(a) has a wavelength of absorbance maximum which is less than about 15 nm different than the maximum wavelength of emulsion sensitivity provided by the spectral sensitizing dye, and(b) has a half band width that is approximately equal to the half bandwidth of the sensitizing dye, thereby resulting in an emulsion which has a sensitivity at a wavelength of about 50 nm shorter than the maximum wavelength of sensitization which is about 65% or greater of the emulsion speed at the maximum wavelength of spectral sensitivity.