Claims
- 1. An imaging sheet useful in forming images by exposure-controlled, image-wise reaction of a chromogenic material and a developer, said sheet comprising:
- a support having a layer of microcapsules on one surface thereof,
- said microcapsules having discrete capsule walls which encapsulate an internal phase,
- said internal phase, including a photosensitive composition which undergoes a change in viscosity sufficient to control the release of the internal phase from said microcapsules,
- a chromogenic material associated with said microcapsules such that, upon image-wise exposing said layer of microcapsules to actinic radiation and subjecting said layer of microcapsules to a uniform rupturing force, said chromogenic material image-wise becomes available for reaction with a developer to form an image.
- 2. The imaging sheet of claim 1, wherein said chromogenic material is present in said internal phase with said photosensitive composition.
- 3. The imaging sheet of claim 2, wherein said chromogenic material is a substantially colorless electron donating compound.
- 4. The imaging sheet of claim 3, wherein said photosensitive composition is sensitive to ultraviolet and/or visible radiation.
- 5. The imaging sheet of claim 4, wherein said photosensitive composition includes an ethylenically unsaturated compound.
- 6. The imaging sheet of claim 5, wherein said photosensitive composition includes a photoinitiator.
- 7. The imaging sheet of claim 3, wherein said substantially colorless electronic donating compound is a compound having a lactone, a lactam, a sultone, a spiropyran, an ester, or an amido structure.
- 8. The imaging sheet of claim 5, wherein said discrete capsule wall is formed from a urea-formaldehyde resin or a melamine-formaldehyde resin.
- 9. An imaging sheet comprising a support having thereon pressure rupturable microcapsules encapsulating an internal phase including a radiation curable composition and a color precursor which forms a colored material upon contact with a co-reactant, said microcapsules having discrete capsule walls which encapsulate the internal phase.
- 10. A process comprising imagewise exposing an imaging sheet comprising a support having thereon pressure rupturable microcapsules encapsulating a radiation curable composition and a color precursor which forms a colored material upon contact with a co-reactant to immobilize the color precursor in the exposed areas; and rupturing said microcapsules in the unexposed areas in the presence of co-reactant to form a color image.
- 11. The imaging sheet of claim 1 wherein said photosensitive composition includes a substituted coumarin compound.
Parent Case Info
This application is a continuation of U.S. application Ser. No. 520,023 filed Aug. 3, 1983, now U.S. Pat. No. 4,551,407, which in turn is a continuation of U.S. application Ser. No. 320,356, filed Nov. 12, 1981, now U.S. Pat. No. 4,399,209.
US Referenced Citations (12)
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Continuations (2)
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Number |
Date |
Country |
Parent |
520023 |
Aug 1983 |
|
Parent |
320356 |
Nov 1981 |
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