Abstract: Compounds suitable for use as acutance, antihalation and filter dyes in silver halide imaging materials having a nucleus represented by a compound comprising a nucleus represented by one of the following general formulae (I) and (II): in which; A and B independently represent those non-metallic atoms necessary to complete a neutral heterocyclic ring in which at least one ring atom is nitrogen, R represents hydrogen or an alkyl group, and Y represents a divalent aliphatic linking group.

Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by laser irradiation, which is useful in the production of colored images.

Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.

Abstract: An organic photoreceptor that includes:(a) a charge transport compound having the formula ##STR1## where n is an integer between 2 and 6, inclusive; R.sup.1 and R.sup.2, independently, are an alkyl group, a cycloalkyl group, or an aryl group, or R.sup.1 and R.sup.2 combine with the nitrogen atom to form a ring;Y is a bond, a carbon atom, a --CR.sup.3 group, an aryl group, a cycloalkyl group, or a cyclosiloxyl group;R.sup.3 is hydrogen, an alkyl group, or an aryl group; andX is a linking group having the formula --(CH.sub.2).sub.m -- wherein m is an integer between 4 and 10, inclusive, and one or more of the methylene groups is optionally replaced by an oxygen atom, a carbonyl group, or an ester group;(b) a charge generating compound; and(c) an electroconductive substrate.

Abstract: An organic photoreceptor that includes:(a) a charge transport compound having the formula ##STR1## where n is an integer between 2 and 6, inclusive; R.sup.1 and R.sup.2, independently, are an alkyl group, a cycloalkyl group, or an aryl group, or R.sup.1 and R.sup.2 combine with the nitrogen atom to form a ring;Y is a bond, a carbon atom, a --CR.sup.3 group, an aryl group, a cycloalkyl group, or a cyclosiloxyl group;R.sup.3 is hydrogen, an alkyl group, or an aryl group; andX is a linking group having the formula --(CH.sub.2).sub.m -- where m is an integer between 4 and 10, inclusive, and one or more of the methylene groups is optionally replaced by an oxygen atom, a carbonyl group, or an ester group;(b) a charge generating compound; and(c) an electroconductive substrate.

Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.

Abstract: A thermographic element comprising in a non-aqueous binder medium a silver salt oxidizing agent in reactive association with a compound comprising a plurality of redox color releasing moieties such that oxidation of each redox color releasing moiety causes release from said compound of a thermally diffusible dye.The compounds many of which are new incorporate two or more developer moieties into a single molecule to minimize the diffusibility of the compound. Following oxidation, either directly by the silver salt or by means of a cross-oxidizing agent, each oxidized developer moiety releases a thermally diffusible dye. The compounds are of sufficient size and molecular weight to slow or prevent diffusion in imaging systems and yet possess several active developer moieties per molecule which is advantageous over known ballasted dye releasers which comprise bulky molecules with only a single developer moiety.

Abstract: A method of chemical sensitisation which comprises providing a silver halide emulsion containing negative-acting silver halide grains, and adding to said silver halide emulsion a sulphur releasing organic polymer having multiple sulphur releasing groups per polymer molecule. The polymer preferably has at least 10 sulphur releasing groups per molecule which may be selected from thiocarbonate, dithiocarbonate, trithiocarbonate, dithioester, thioamide, thiocarbamate, dithiocarbamate, thiouram, thiourea, dithiooxamide, thioketone and trisulphide.

Abstract: A compound having a nucleus of the formula: ##STR1## The compounds are suitable for use as image stabilisers and antifoggants in photothermographic materials and exhibit acceptably low sensitization of human skin.

Abstract: A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive reducible silver source; and(d) a binder;wherein the reducing agent is a hydrazide redox-dye-releasing compound of the general formulae: ##STR1## wherein: D represents the chromophore of a thermally mobile dye; X represents a single bond or a divalent linking group; R.sup.1 and R.sup.2 independently represent an organic group; and n.gtoreq.1.

Abstract: A medical radiographic element comprising a base bearing on each of its two major surfaces a layer of photographic silver halide emulsion sensitive to green light, said element having between the base and at least one silver halide layer a hydrophilic colloid layer containing a dye having a nucleus of the general formula: ##STR1## wherein: each R independently represents an alkyl group,each Y independently represents an electron attracting group andeach X represents a water solubilising group.

Abstract: A compound having a nucleus of the formula: ##STR1## The compounds are suitable for use as image stabilizers and antifoggants in photothermographic materials and exhibit acceptably low sensitization of human skin.

Abstract: A compound of the formula: ##STR1## wherein; R is a member selected from a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group.The compounds find utility as antifoggants and image stabilisers in photothermographic materials.

Abstract: A photothermographic material comprising photographic silver halide, a reducible silver source, a reducing agent for silver ion and a binder, and as an antifoggant and/or stabilizer, a compound of the formula (I): ##STR1## wherein R is a member selected form the group consisting of a hydrogen atom, an alkyl group, an aryl group and a heterocyclic group.

Abstract: A silver halide photographic light sensitive emulsion containing a hydrazine of the general formulaR.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I)in whichR.sup.3 represents an aryl group,one of R.sup.4 and R.sup.5 is a hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl,G represents carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidized hydroquinone a cyclization reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X.

Abstract: A silver halide photographic light sensitive emulsion containing a hydrazine of the general formulaR.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I)in which:R.sup.3 represents an aryl group,one of R.sup.4 and R.sup.5 is a hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl,G represents carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or unsubstituted imino group andX is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidized hydroquinone a cyclization reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X.