Abstract: A transfer imaging system is disclosed wherein images are formed by image-wise exposing a layer comprising a chromogenic material and pressure rupturable capsules containing, as an internal phase, a photosensitive composition. In a preferred embodiment, the chromogenic material is encapsulated with the photosensitive composition. Upon exposure and capsule rupture the chromogenic material is image-wise transferrable to a developer or copy sheet where the chromogenic material reacts with a developer to form an image. Preferred systems are sensitive to U.V. or blue light in the wavelength range of 380 to 480 nm.

Abstract: An optical recording medium is prepared by the use of spiropyrane whose molecular structure contains an alkyl chain having at least 10 more carbon atoms, and by the use of an LB film method or a spin coating method. This recording medium is of a structure wherein when irradiated with the UV, the spiropyrane is photo-isomerized to photomerocyane and, thereafter, when subsequently heated at 35.degree. to 40.degree. C. for 15 minutes, a J-aggregate of the photomerocyane is formed in very stabilized form. When the recording medium is irradiated with light of wavelength of visible spectrum, the color is bleached with the information consequently recorded. The optical recording medium herein disclosed is rewritable and can retain the recorded information for 5,000 hours or more.

Abstract: Disclosed is photo- and pressure-sensitive recording paper which comprises a support coated with first microcapsules each enclosing contents including a substance which has hardness changeable corresponding to a quantity of light irradiation thereon and which includes a dye precursor, and with second microcapsules each enclosing a developer which is a thermoplastic substance, and further disclosed is a pressure developing apparatus suitable for pressure developing such photo- and pressure-sensitive recording paper as described above.

Abstract: Upon imagewise exposure, a photopolymerizable composition which contains(a) a polymeric binder;(b) a compound that has at least one terminal ethylenic double bond and a boiling temperature, at standard pressure, of above 100.degree. C., and that can form a polymer by polymerization initiated by a free-radical process;(c) a photoinitiator;(d) a leuco base of a triarylmethane dye; and(e) a photochromic spiro-indolino-benzopyran compound represented by the formula ##STR1## wherein R denotes a hydrogen atom or a C.sub.1 -to-C.sub.16 alkyl group,R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different, and each denotes a hydrogen or a halogen atom, a C.sub.1 -to-C.sub.4 alkyl or alkoxy group, or a nitro group, andR.sup.5, R.sup.6, R.sup.7 and R.sup.8 are identical or different, and each denotes a hydrogen or a halogen atom, a nitro or an amino group, a C.sub.1 -to-C.sub.5 alkyl or alkoxy group, or a C.sub.6 -to-C.sub.

Abstract: The present invention provides a transfer imaging sheet wherein an image is invisible in visible light but apparent under ultraviolet or infrared radiation. The transfer imaging sheet comprises an imaging sheet having a coating on one surface thereof of an image forming agent selected from the group consisting of an ultraviolet-readable fluorescer and an infrared-readable dye, and a radiation curable composition which undergoes an increase in viscosity upon exposure to actinic radiation. The radiation curable composition is encapsulated in rupturable microcapsules as an internal phase, and preferably, the image forming agent is encapsulated with the radiation curable composition.

Abstract: A photosensitive and pressure-sensitive recording sheet and a process for recording an image using such recording sheet, said recording sheet comprising microcapsules, which enclose a first component, held on one side surface of a sheet and a second component, which causes color change of the surface of sheet when it reacts with the first component that is held on said one side surface of the sheet, held on the opposing side surface of the sheet and, moreover, one other component, which causes a change in the mechanical breaking strength of the microcapsule in response to exposure to light, enclosed in the microcapsules; and said process comprising exposing said one side surface of the sheet holding the microcapsules to a light, putting the so exposed surface of the sheet together with the surface, which holds the second component, of another recording sheet of the same construction and pressing the so laminated two sheets with each other.

Abstract: The present invention provides a photosensitive material having a support, a layer containing opacifying agent, a layer containing microcapsules and a layer of developer material. The layer containing opacifying agent, the layer containing microcapsules and the layer of developer material are positioned such that upon rupturing the microcapsules, the color former diffuses to the developer material layer to form an image in the developer material layer. The final image is viewed against the opacifying agent.

Abstract: A contrast mask for a transparent photographic original may be formed by illuminating a photochromic body (11,41) through the original with white light. Preferably the photochromic body (11,41) is optically neutral (grey) and contains a silver halide as a photochromically active substance. Preferably the mask-forming exposure is performed separately from the photographic exposure of a recording medium through the original and the mask, by a different light source (27). The optical contrast range of the mask can be varied in response to the optical contrast range of the original by varying the amount of the mask-forming exposure. This variation is preferably effected by varying the number of flashes of the light source (27).The photochromic body is preferably incorporated in the holder (1,33) for the transparent original.Photographic reproduction apparatus may include an automatic densitometer, the output of which controls the amount of the mask-forming exposure.

Abstract: An optical recording medium including a substrate and a photosensitive layer thereon, the photosensitive layer containing as its major ingredients, the combination of a polymeric binder resin and an indolinospirobenzothiopyran compound represented by the general formula (I): ##STR1## where R.sub.1, R.sub.2 and R.sub.3 are each a hydrogen atom, a halogen atom, an alkyl group containing from 1 to 5 carbon atoms, an alkoxy group containing from 1 to 5 carbon atoms, an alkoxymethyl group containing from 1 to 5 carbon atoms in the alkoxy group, a hydroxymethyl group or an alkylaminomethyl group containing 2 to 6 carbon atoms in the alkyl group. The optical recording medium has a colored image which is very stable against heat and visible light.

Abstract: A series of novel 3-pyrryl fulgides and fulgimides are disclosed which are photochromic. The photochromic compounds are coloured by subjecting them to irradiation in the near ultraviolet and will revert to the colourless form on exposure to visible light, especially light having a wavelength in 600 to 650 nm band.

Abstract: This invention is directed to a method for modifying the coloration produced in a silver halide-containing photochromic glass when heat treating the glass at a temperature not exceeding 450.degree. C. under reducing conditions. The method comprises subjecting such a glass having a base composition which contains at least 1% by weight Li.sub.2 O, at least 2% by weight Na.sub.2 O, and at least 6% by weight Li.sub.2 O+Na.sub.2 O+K.sub.2 O to an ion exchange reaction, wherein lithium ions, and potassium ions, when the latter are present in the composition, in the glass surface are exchanged with sodium ions from an external source, prior to the reduction heat treatment.

Abstract: A photochromic photosensitive composition comprising a indolinobenzothipyran-based spiropyran compound, a transparent, high molecular weight film forming resin, and a compound represented by the general formula (I): ##STR1## wherein R.sub.1, R.sub.3, R.sub.4 and R.sub.6 each represents a hydrogen atom, a halogen atom or a hydroxyl group, R.sub.2 and R.sub.5 each represents a hydrogen atom or a hydroxyl group, and X represents --NH--, --S--, ##STR2## (where R.sub.7 and R.sub.8 each represents a hydrogen atom, --CH.sub.3, --C.sub.2 H.sub.5, --CH.sub.2 CH.sub.

Abstract: An optical recording medium comprising a substrate and an information recording layer which consists of monolayer assemblies comprising a photochromic compound of which is based on cis-trans isomerization such as an amphipathic derivative of azobenzene, indigo or thioindigo having a long chain substituent, which monolayers are formed on the substrate by the Langmuir-Blodgett method and oriented in a two-dimensional plain. When the recording medium is irradiated by light, light absorption spectrum of the recording layer changes so that information is recorded. Since the photochromic compound is oriented in a monolayer, its photochromism lasts long.

Abstract: A recording medium and an image recording process in which a change in enzyme activity by light irradiation is utilized.

Abstract: Novel photochromic compounds are disclosed, which compounds are represented by the general formula ##STR1## in which R.sub.1 represents an alkyl group having 1 to 20 carbon atoms, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a halogen atom, a nitro group, a cyano group or a dimethylamino group, and R.sub.6, R.sub.7 and R.sub.8 independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom, and correspondingly 97 to 50 wt % of a film-forming polymer. Photosensitive compositions and materials comprising the compounds are also described.

Abstract: A photochromic photosensitive composition contains a benzothiazolinospiropyran compound represented by the general formula: ##STR1## wherein R.sub.1 represents an alkyl group containing 1 to 10 carbon atoms, R.sub.2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R.sub.3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms, and R.sub.4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, dissolved or dispersed in a bisphenol A type polyether resin for enhancing thermal stability of the compound in a colored state. Addition of a phenol to the composition serves to further enhance the heat stability. As compared with conventional photochromic compositions, this photochromic photosensitive composition is thermally extremely stable in a colored state, and the developed color image can be stored for an enough long time to be suited for long-time recording.

Abstract: An improved positive-working resist material capable of forming on a substrate either a positive resist pattern or a negative resist pattern. The positive-working resist material comprises a positive-working resist resin having incorporated therein one or more photochromic compounds, such as spiropyrans, triphenylmethane dyes, anils and the like. A positive or negative resist pattern having a remarkably improved definition can be obtained. The use of such a positive-working resist material in the formation of a negative resist pattern on the substrate is also disclosed.

Abstract: The photosensitivity of lead lanthanum zirconate titanate (PLZT) ceramic material used in high resolution, high contrast, and non-volatile photoferroelectric image storage and display devices is enhanced significantly by positive ion implantation of the PLZT near its surface. Implanted ions include H.sup.+, He.sup.+, Ne.sup.+, Ar.sup.+, as well as chemically reactive ions from Fe, Cr, and Al. The positive ion implantation advantageously serves to shift the absorption characteristics of the PLZT material from near-UV light to visible light. As a result, photosensitivity enhancement is such that the positive ion implanted PLZT plate is sensitive even to sunlight and conventional room lighting, such as fluorescent and incandescent light sources. The method disclosed includes exposing the PLZT plate to the positive ions at sufficient density, from 1.times.10.sup.12 to 1.times.10.sup.17, and with sufficient energy, from 100 to 500 KeV, to provide photosensitivity enhancement.

Abstract: The light sensitive recording material which is suitable for use as recording material in computers and oscillographs contains as light sensitive substance a photochromic film forming cyclic polyimide compound.

Abstract: An initial step of inspecting a positive color transparency is performed to determine the darkest detail area thereof to be reproduced and is subsequently followed by the superposing of the positive color transparency on a panel of photochromic (light sensitive) glass to form a laminate-type assembly. Thereafter, the assembly has a beam of light directed therethrough from the transparency side thereof. The beam intensity and the duration of illumination is sufficient to cause the more heavily illuminated portions of the glass panel to darken. Thereafter, trial enlarger exposing of a trial color separation negative film sheet through the assembly and a half-tone screen with sufficient light determined to properly expose the area of the trial negative film sheet corresponding to the prior mentioned darkest detail area of the transparency is accomplished.

Abstract: This invention is concerned with hydrated glass articles having base compositions within the Na.sub.2 O and/or K.sub.2 O-ZnO-Al.sub.2 O.sub.3 -SiO.sub.2 -Cl field and having at least a surface layer thereon containing Ag-AgCl crystals which impart photo-anisotropic effects to the glass articles. Silver ions are introduced into the surface layer through a solution ion exchange process with sodium and/or potassium ions of the parent glass. The silver remains in the ionic state until exposure to ultraviolet radiation which results in the development of silver-containing aggregates, i.e., Ag-AgCl, via a photolytic reaction. The aggregates contribute to photo-anisotropic absorption bands which are centered around 340 nm and 700 nm. Polarization of the photo-dichroic and photo-birefringent effects of the inventive products can be altered reversibly between two arbitrary directions without fatigue. The photo-anisotropic image can be read cyclically essentially indefinitely without destruction.

Abstract: The properties of a dichromated hydrophilic colloid photosensitive composition are improved by the incorporation of certain copolymer latices. More particularly, the copolymer particles in the latex conform to the structure:--A).sub. (B --.phi.-awherein A is a polymerized monomer or monomers having the structure: ##STR1## and B is a polymerized monomer or monomers having the structure: ##STR2## wherein each R.sup.1 is independently hydrogen or methyl;R.sup.2 is phenyl, substituted phenyl or a straight- or branched-chain alkoxycarbonyl group of about 2-8 carbon atoms;R.sup.3 is --NR.sup.4 R.sup.5 or --OR.sup.6 wherein R.sup.4 and R.sup.5 are independently selected from hydrogen, alkyl of about 1-8 carbon atoms including substituted alkyl, and alkyl containing hetero atoms in the alkyl chain, and R.sup.6 is hydroxyalkyl of about 1-8 carbon atoms; anda represents a weight percent of about 75-95.

Abstract: Photochromic aziridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 separately are hydrogen, lower alkyl, phenyl, or ortho or para lower alkyl or lower alkoxy substituted phenyl, and together are alkylene having 4 to 7 carbon atoms inclusive, are coated onto a substrate to provide a microcrystalline deposit thereon preferably followed by application of a barrier coating which is substantially oxygen-impermeable. In this manner, a thermally stable optically erasable imaging medium is provided.

Abstract: The present invention relates to a photopolymerizable mixture comprising a compound with at least two terminal ethylenically-unsaturated groups, a boiling point above 100.degree. C. and which is capable of addition polymerization, a polymeric binder, a photoinitiator, and a monoazo dye corresponding to Formula I: ##STR1## R.sub.2 and R.sub.3 are alkyl or alkenyl groups which may be substituted, and R.sub.4 and R.sub.5 are hydrogen or halogen atoms, or alkyl or alkoxy groups.

Abstract: A photochromic spiropyran compound is uniformly dispersed in a vinyl chloride homopolymer or copolymer resin binder. The resulting photosensitive composition provides an image which is highly stable against exposure to light, darkness, and heat when the composition is exposed to a light source emitting radiation of wavelength which includes the absorption band of the spiropyran compound.

Abstract: Photochromic aziridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 taken separately are hydrogen, lower alkyl, phenyl, or ortho or para lower alkyl or lower alkoxy substituted phenyl, and wherein R.sub.1 and R.sub.2 taken together are alkylene having 4 to 7 carbon atoms, inclusive, are vapor deposited on a substrate, followed by application of a barrier coating which is substantially oxygen-impermeable to thereby provide a thermally stable optically erasable recording medium.

Abstract: Photochromic compounds and useful applications thereof having the general formula: ##STR1## in which X represents oxygen or NR.sub.6, R.sub.6 being hydrogen, alkyl, aryl or aralkyl, R.sub.1 represents hydrogen, alkyl, aryl, or aralkyl, Y and Y.sub.1 being the same or different represent hydrogen, alkyl, halogen, or alkoxy, Z represents hydrogen, halogen, alkyl, alkoxy, or aryloxy R.sub.5 represents hydrogen, alkyl, alkoxy, or aryloxy, R.sub.4 represents alkyl or aryl, and R.sub.2 and R.sub.3 represent the same or different alkyl, aralkyl or aryl groups or one of R.sub.2 and R.sub.3 represents hydrogen and the other is alkyl, aralkyl, or aryl, and with the proviso that when Z or Y is alkoxy or aryloxy, R.sub.1 is other than hydrogen.