Radiation imagery chemistry: process – composition – or product th – Microcapsule – process – composition – or product
Patent
1987-07-02
1988-10-11
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Microcapsule, process, composition, or product
430 10, 430 21, 430139, 430211, 430235, 430933, 430962, G03C 168, G03C 554
Patent
active
047771089
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. Images are formed by image-wise exposing the coating to actinic radiation and rupturing the microcapsules in the image areas with the coating in facial contact with a receiver sheet such that the internal phase is image-wise released from the ruptured microcapsules and is transferred to the receiver sheet to form an image on the receiver sheet. The image is then read under ultraviolet radiation with the naked eye or infrared radiation with an instrument designed to read the image.
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Schilling Richard L.
The Mead Corporation
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