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:
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:
An internal latent image-type direct positive silver halide emulsion comprising a core/shell structure silver halide which is composed of a chemically sensitized core and a chemically sensitized shell and which is not prefogged, and a compound of formula (I): Formula (I) (X) k -(L) m -(A-B) n wherein X represents a light-absorbing group or a silver halide-adsorbing group having at least one atom selected from the group consisting of N, S, P, Se and Te; L represents a divalent linking group having at least one atom selected from the group consisting of C, N, S and O; A represents an electron-donating group; B represents a leaving group or a hydrogen atom, which leaves or undergoes deprotonation after being oxidized, to form a radical A • ; k and m each independently are an integer of 0 to 3; and n is 1 or 2. A color diffusion transfer light-sensitive material containing the emulsion.
摘要:
A color photographic element comprises a support and at least one dye image forming layer unit comprising gelatin-peptized radiation-sensitive silver halide grains, a fragmentable electron donating compound; and an electron transfer agent releasing compound.
摘要:
A photographic element comprises 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 emulsion layers comprises
a) an emulsion with 3D, core/shell grains of at least 0.40 µm average diameter having a high iodide content in the core of the grain with a shell containing a lesser amount of iodide, b) a one-equivalent image-dye forming coupler, and c) a fragmentable electron donating 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, β - , 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 (that is, equal to or more negative than about -0.7V).
摘要:
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 µm 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 proton, a base, β - , 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 (that is, equal to or more negative than about -0.7V).
摘要:
Disclosed are photothermographic materials having, on a support, a layer that contains at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the mean silver iodide content of the photosensitive silver halide falls between 5 and 100 mol%, preferably between 40 and 100 mol%.
摘要:
A photographic element comprises 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 emulsion layers comprises a) an emulsion with 3D, core/shell grains of at least 0.40 mu m average diameter having a high iodide content in the core of the grain with a shell containing a lesser amount of iodide, b) a one-equivalent image-dye forming coupler, and c) a fragmentable electron donating 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 (that is, equal to or more negative than about -0.7V).