Abstract: A photosensitive composition comprising a photooxidant, leuco dye and a substituted hydroxylamine compound of the formula R.sub.1 R.sub.2 NOH wherein R.sub.1 and R.sub.2, e.g., are alkyl, cyclic alkyl, aryl, aralkyl, alkaryl and R.sub.1 and R.sub.2 taken together form a heterocyclic ring of 5 to 7 carbon atoms. Optionally monomers and polymeric binders can be present. The compositions are useful for photoimaging and in solvent and aqueous developable resist-forming films.

Abstract: Stable print-out dye systems are provided for photopolymerizable compositions, finding particular use as photoresists. The dye compositions comprise a triarylmethane leuco dye in combination with a high-boiling, relatively thermally-insensitive polyhalo alicyclic compound having at least five bromines. The print-out dye system is incorporated with an addition polymerizable composition, a light-sensitive initiator, and minor amounts of other additives.

Abstract: Negative-working diazography material is comprised of (i) at least one diazonium compound, (ii) at least one acid labile enolic, preferably phenolic blocked-coupler adapted to be converted in the presence of acid to an active azo-coupling component, (iii) at least one light-sensitive acid progenitor, and (iv) at least one carboxylic acid anhydride. The diazonium compound can itself concurrently function as the acid progenitor, e.g., when complexed with a Lewis acid. Upon imagewise exposure to light, acid catalyst is photochemically liberated, thus unblocking coupler molecules such that dye image forms under alkaline developing conditions only where the material has been irradiated. Under alkaline developing conditions, the anhydride reacts to render the unused diazo component remaining in the unexposed areas inactive.

Abstract: Imaging means, such as a tetrazolium salt, capable of reduction to form a visible image is present in a radiation-sensitive layer in combination with a photoreductant incorporating one or more labile hydrogen atoms and capable of producing a reducing agent precursor in radiation-struck areas of the layer. An image is produced in the layer by processing the layer after imagewise exposure to actinic radiation.

Abstract: A stabilized photosensitive composition comprising a leuco dye, a photooxidizing agent, and further a 2,4-dihydroxybenzaldoxime which is suitable for use in lithography, photoresists, etc., for obtaining visible contrast between the exposed and unexposed areas.

Abstract: A recording method for directly forming a visible image, which method comprises exposing a recording material information-wise to ultra-violet radiation having a wave-length in the range of 200 nm to 400 nm, with a radiation intensity of at least 5.times.10.sup.11 erg/sq.cm.s so that the recording material receives a radiation energy dose of at least 1.times.10.sup.7 erg/sq.cm, the said recording material containing in a layer in admixture with an organic binder medium:(A) at least one dye precursor compound, which is a spiropyran compound or a compound corresponding to one of the general formulae ##STR1## wherein: R represents hydrogen, a lower alkyl (C.sub.1 -C.sub.3) group, a lower alkyl group, a phenyl group or phenyloxy,R.sup.1 represents an organic group,Z.sup.1 represents the necessary atoms to close a homocyclic ring or ring system,Z.sup.2 represents the necessary atoms to close a homocyclic ring or ring system,R.sup.2 represents a lower alkyl (C.sub.1 -C.sub.

Abstract: A photosensitive resin composition comprising:(a) a photopolymerizable or photocrosslinkable ethylenically unsaturated compound;(b) a compound of the formula (I): ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 may be the same or different and each represents a hydrogen atom, a chlorine atom or a bromine atom and at least one of X.sub.1, X.sub.2 and X.sub.3 representing a chlorine atom or a bromine atom; Y represents a --CX.sub.1 X.sub.2 X.sub.3 group where X.sub.1, X.sub.2 and X.sub.3 are as defined above, --NH.sub.2, --NHR', --NR'.sub.2, --SR', --OR' or --R' wherein R' is an alkyl group or an aryl group; R is an alkyl group, an aryl group or an alkenyl group, and may be substituted;(c) a compound of the formula (II): ##STR2## where Z represents the non-metallic atoms necessary to complete a nitrogen-containing heterocyclic ring; R.sub.1 is an alkyl group or a substituted alkyl group; R.sub.2 is an alkyl group, an aryl group or a substituted aryl group; and(d) a dye precursor.

Abstract: Negative-working diazography material is comprised of (i) at least one diazonium compound, (ii) at least one acid labile enolic, preferably phenolic blocked-coupler adapted to be converted in the presence of acid to an active azo-coupling component, and (iii) at least one light-sensitive acid progenitor. The diazonium compound can itself concurrently function as the acid progenitor, e.g., when complexed with a Lewis acid. Upon imagewise exposure to light, acid catalyst is photochemically liberated, thus unblocking coupler molecules such that dye image forms under alkaline developing conditions only where the material has been irradiated.

Abstract: A light-sensitive image recording material comprising, as a self-supporting film or in one or more layers on a support, at least(a) a heat sensitive coloring element comprising at least one polyvinyl pyridine and at least one polyvinylidene halide, and(b) a light sensitizing element comprising at least one of(1) a compound which, on exposure to actinic radiation, is capable of complexing the polyvinyl pyridine of element (a) or is capable of forming a quaternary salt with the polyvinyl pyridine of element (a), or(2) a compound which, on exposure to actinic radiation, is capable of releasing a precursor which is capable of complexing the polyvinyl pyridine of element (a) or is capable of forming a quaternary salt with the polyvinyl pyridine of element (a) under heating,and a dry process for recording a light image comprising(1) imagewise exposing to actinic radiation the light-sensitive image recording material described above, and(2) uniformly heating the imagewise exposed light-sensitive image recording mate

Abstract: A non-silver photosensitive image forming composition containing at least one substituted bis-diaryl vinylidene compound and/or at least one substituted bis-diaryl imine compound and tetraiodoethylene in a dried photosensitive layer thickness not exceeding 3 microns in layer thickness, the nature of the substitution being such that substantially any high extinction absorption peak or combination of high extinction absorption peaks is available from a family of compositions covering the range of 350 to 900 nm in wavelength, said composition being placed on a transparent or reflective substrate fitted with a compatible adhesive for the photosensitive layer not more than 0.