Abstract: The present invention provide a dye-sensitized photopolymerizable composition comprising a free radical addition polymerizable material, and a photoinitiator, the photoinitiator consisting essentially of a photoreducible dye, a thiol, and an N,N'-dialkylaniline.

Abstract: A developer sheet useful in forming reproductions which have a controllable gloss finish or in forming transparencies comprising a support having a layer of a finely divided, thermoplastic, developer material on the surface thereof, said developer material being capable of reacting with a color precursor to produce a visible image and being capable of coalescing into a thin film which imparts gloss to said image upon application of heat and/or pressure.The developer sheet comprising a support having a layer of a finely divided thermoplastic developer material on the surface thereof can additionally comprise oil-containing microcapsules such that upon microcapsule rupture, the oil plasticizes the developer material.

Abstract: A method for forming images which comprises image-wise exposing a photosensitive material to heat while simultaneously exposing said material to non-infrared actinic radiation, said material including a support and a layer of microcapsules containing an image-forming agent and a radiation curable composition on the surface of said support; said radiation curable composition being liquid at ambient temperatures and being substantially unhardened in the areas in which said material is simultaneously exposed to said heat and radiation and being substantially hardened in the areas in which said material is not simultaneously exposed to said heat and radiation; and subjecting said microcapsules to a uniform rupturing force such that said microcapsules image-wise release said image-forming agent.

Abstract: The present invention provides magnetic recording compositions containing magnetic particles and a photohardenable composition wherein the photohardenable composition contains a free radical addition polymerizable or crosslinkable compound and an ionic dye-reactive counter ion compound. The ionic dye-reactive counter ion compound is capable of absorbing actinic radiation and producing free radicals within initiate free radical polymerization or crosslinking of the polymerizable or crosslinkable compound. The present invention also provides magnetic recording media incorporating the aforementioned magnetic recording compositions.

Abstract: A radiation dosimeter comprising a support having a layer of microcapsules on the surface thereof, said microcapsules containing an image-forming agent and radiation curable composition, said composition being essentially insensitive to visible light and ultraviolet radiation and being sensitive to gamma and electron beam radiation; and a process for measuring gamma and electron beam radiation.

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 developer sheet having reduced tack useful in forming reproductions having a controllable gloss finish or in forming transparencies is provided. The developer sheet has a support with a layer on the surface of the support of a finely divided thermoplastic developer material and a non-reactive, non-scattering pigment. The developer material is capable of reacting with a color precursor to produce a visible image while the pigment reduces tack. Both the developer material and the pigment are capable of forming an essentially transparent film upon the application of heat and/or pressure.

Abstract: The present invention provides radiation-curable ink compositions comprising pigment and a photohardenable composition; the photohardenable composition comprises a free radical addition polymerizable or crosslinkable compound and an ionic dye-reactive counter ion compound which is capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization or crosslinking of the polymerizable or crosslinkable compound.

Abstract: Imaging systems employing photosensitive microcapsules having improved film speed are disclosed wherein the microcapsules contain a photosensitive composition in which the photoinitiator system includes a photobleachable sensitizer such as a 3-substituted coumarin compound; the invention is particularly useful in providing self-contained imaging systems which are sensitive at 390-500 nm but which can be photobleached to reduce background yellow; an imaging process including a photobleaching step following exposure and development is also disclosed.

Abstract: Methods for forming relief images are disclosed employing photosensitive microcapsules; typically, the internal phase of the microcapsules includes a photohardenable composition such as an ethylenically unsaturated compound and a photoinitiator; release of the composition is controlled by exposure and the application of a uniform rupturing force such as pressure; in one embodiment, the released composition functions as a resist image for subsequent processing with an etching agent such as an acid.

Abstract: An improved means for developing photosensitive sheets employing a microencapsulated radiation sensitive composition wherein the microcapsules typically contain a thermally activatable gas generating compound and following exposure the imaging sheet is heated to rupture the microcapsules and develop the image.

Abstract: Imaging systems employing photosensitive microcapsules having improved film speed are disclosed wherein the microcapsules contain a 4-(4'-aminophenyl)-pyridine compound in the internal phase as a color former.

Abstract: An imaging material and process employing photosensitive microcapsules useful in forming two or more image colors by exposure with an intensity or time modulated radiation source such as a laser; the imaging material comprises a support having at least two sets of photosensitive microcapsules on the surface, one set of microcapsules is made up of high speed microcapsules which are more sensitive to a predetermined actinic radiation than a second set of microcapsules made up of lower speed microcapsules; the microcapsules include a photosensitive composition which undergoes a change in viscosity upon exposure to actinic radiation; first and second image-forming agents are respectively associated with each set of microcapsules; the imaging material is useful in forming images of two or more colors by a process which comprises image-wise exposing the imaging material to actinic radiation at a first exposure amount which is substantially quantitatively different than the second exposure amount, and subjecting the

Abstract: Photosensitive microcapsules having radiation absorbers associated therewith such that the sensitivity of the microcapsules is reduced over a portion of their spectral sensitivity range; the spectral sensitivity of the microcapsules is thereby adjusted such that three sets of microcapsules having distinctly different spectral sensitivities and individually containing color formers for full color imaging can be provided on a single support surface and discriminately exposed in a manner which corresponds to the red, green and blue components of an original.

Abstract: A transfer imaging system employing photosensitive microcapsules useful in obtaining high gloss images wherein the developer sheet is overcoated with a discontiuous layer of a thermoplastic polymeric pigment which is fused into a thin essentially transparent polymeric film following development.

Abstract: An improved means for exposing and developing photosensitive sheets employing a microencapsulated radiation sensitive composition wherein a cover sheet is adhered to a layer of the microcapsules and following exposure the cover sheet is peeled away to rupture the microcapsules and develop the image. The cover sheet also reduces the oxygen concentration at the surface of the microcapsules and thereby enhances the sensitivity of the imaging sheet.

Abstract: An imaging material of the type in which a radiation sensitive composition is encapsulated in a plurality of microcapsules and exposure controls the release of the internal phase from the microcapsules and mobilization of an image-forming agent in which faster toe speed and higher gamma are obtained by sequestering a predetermined amount of the image-forming agent mobilized upon rupturing the microcapsules.

Abstract: An imaging material in which images are formed by exposing a sheet having on a surface a layer of microcapsules containing a radiation sensitive internal phase, and rupturing the microcapsules; wherein images in the form of transparent windows are formed in an opaque image-receiving layer containing a light-scattering pigment by rendering the pigment transparent with the internal phase released from the ruptured microcapsules.

Abstract: A self-contained silver halide diffusion transfer imaging sheet is provided which contains three layers on a substrate. The first layer is a silver halide emulsion formed in a non-ionic material. The intermediate layer is a water barrier. The third layer is a nucleating region which contains collodial silver. A developer, base and silver transport agent can also be located in these layers. For example, the base and silver transport agent can be located in the nucleating layer, with the developer located in the emulsion layer. After the emulsion is exposed to actinic radiation, a non-aqueous activating medium is supplied which initiates the development and diffusion transfer processes. The final result is a positive image in the nucleating layer.

Abstract: A process for improving the sensitivity of imaging materials employing an encapsulated radiation sensitive composition including a photoinitiator; wherein the imaging material is subjected to a uniform exposure which does not produce images but sequesters oxygen present in the capsules and converts it to a non-inhibiting form. An imaging material is also disclosed wherein the radiation sensitive composition additionally includes an oxygen sequestering agent.