Claims
- 1. A method for producing images comprising the steps of:
- providing a substrate having front and back surfaces, said substrate having a coating comprising photosensitive microcapsules located on either of said front or back surfaces, said microcapsules having an internal phase containing an image-forming agent, a photohardenable composition comprising a free radical addition polymerizable or crosslinkable compound, a photoinitiator comprising an ionic dye=reactive counter ion compound, and a viscosity modifier being a different compound than said free radical addition polymerizable or crosslinkable compound, wherein the presence of said viscosity modifier in said internal phase has the effect of shortening the reversal time of said photosensitive microcapsules;
- image-wise exposing said photosensitive microcapsules to actinic radiation of an intensity exceeding about 2000 ergs/cm.sup.2 sec; and subjecting said microcapsules to a uniform rupturing force to enable said image-forming agent to form an image.
- 2. The method according to claim 1 comprising the additional step of:
- providing a developer material capable of reacting with said image-forming agent to form an image;
- wherein said subjecting said microcapsules to a uniform rupturing force step comprises rupturing said microcapsules in the presence of said developer material.
- 3. The method according to claim 2 wherein said image-wise exposing step comprises exposing said microcapsules to radiation having an intensity between about 2000 ergs/cm.sup.2. sec. and about 32000 ergs/cm.sup.2. sec.
- 4. The method according to claim 2 wherein said method is capable of producing full color images and wherein said photosensitive microcapsules comprises three sets of microcapsules.
- 5. The method according to claim 4 wherein said three sets of microcapsules comprise a first set of microcapsules containing a cyan color-forming agent, a second set of microcapsules containing a magenta color-forming agent and a third set of microcapsules containing a yellow color-forming agent.
- 6. The method according to claim 5 wherein said image-wise exposing step comprises exposing said three sets of microcapsules to radiation emitted from a broad band visible light source.
- 7. The method according to claim 1 wherein said photoinitiator comprises a cyanine dye borate.
- 8. The method according to claim 1 wherein said viscosity modifier comprises a compound capable of polymerizing or crosslinking by free radical addition polymerization.
- 9. The method according to claim 8 wherein said viscosity modifier is selected from the group consisting of dipentaerythritol hydroxypentaacrylate and ethoxy ethoxylated bisphenol A discrylate.
- 10. The method according to claim 9 wherein said viscosity modifier comprises dipentaerythritol hydroxypentaacrylate.
- 11. The method according to claim 1 wherein said viscosity modifier comprises a non-reactive modifier.
- 12. The method according to claim 11 wherein said viscosity modifier is selected from the group consisting of beeswax, hydrocarbon waxes, free wax acids, esters of wax acids, carnauba wax, Japan wax, Jojoba wax, mineral waxes, petroleum waxes and synthetic waxes.
- 13. The method according to claim 2 wherein said free radical addition polymerizable or crosslinkable compound is trimethylolpropane triacrylate.
- 14. The method according to claim 1 wherein said photosensitive microcapsules ar exposed to actinic radiation of an intensity exceeding about 2000 ergs/cm.sup.2. sec for a period of time longer than the reversal time.
Parent Case Info
This is a continuation of co-pending application Ser. No. 255,907, filed Oct. 11, 1988, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2163563 |
Aug 1985 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Journal of Imaging Science, "Oxidation Kinetics and Reciprocity Behavior in the Microencapsulated Acrylate Imaging Process", J. S. Arney, pp. 27-30, 1987. |
Continuations (1)
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Number |
Date |
Country |
Parent |
255907 |
Oct 1988 |
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