초록 ▼

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 particul

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.

대표청구항 ▼

An imaging sheet useful in forming full color images comprising a support having on a surface thereof a layer containing three sets of microcapsules having distinct sensitivities and containing respectively cyan, magenta, and yellow image-forming agents; one of said three sets of microcapsules being

An imaging sheet useful in forming full color images comprising a support having on a surface thereof a layer containing three sets of microcapsules having distinct sensitivities and containing respectively cyan, magenta, and yellow image-forming agents; one of said three sets of microcapsules being blue light-sensitive and including in the internal phase thereof a free radical addition polymerizable material and a photoinitiator system including a photobleachable sensitizer, said sensitizer being bleachable upon exposure to radiation in the wavelength range of 390 to 500 nm and being represented by formula (I): [Figure] (I) wherein Q is －Z－R1, Z is carbonyl, R1 is a hydroxyl group, an alkenyl group, an alkoxy group, an alkyl group, an aryl group, a carboxyclic group or a heterocyclic group; R2, R3, R4 and R5 each independently represent hydrogen, an alkoxy group, a dialkylamino group, a halogen atom, an acyloxy group, a nitro group, a 5- or 6-membered heterocyclic group, or a group having the formula (II): [Figure] (II) wherein R9 is an alkylene group; R6 is hydrogen, an alkyl group or an aryl group; and wherein two or three of R2, R3, R4 and R5 and the nuclear carbon atoms to which they are attached can together form a fused ring or fused ring system, each ring being a 5- or 6-membered ring.