Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Migration imaging – process – composition – or product – e.g.,...
Patent
1993-09-27
1997-03-25
Lesmes, George F.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Migration imaging, process, composition, or product, e.g.,...
430 39, 430106, 430109, 430110, 430130, 430334, 430339, 430340, 430348, 2503161, 2503171, 250318, 2521861, 252583, 252586, 252587, G03G 1300, G03G 900, G03G 516, G02F 100
Patent
active
056143400
ABSTRACT:
A bleachable composition, including an acid photogenerator and a near-infrared radiation-absorbing dye or pigment, is utilized in a method of migration imaging to prevent unwanted absorptions. This composition can be incorporated either in the thermoplastic imaging surface layer of the imaging element, in the marking particles applied to the element, or both. Alternatively, the components of the bleachable composition can be separated with one in the thermoplastic imaging surface layer and the other in the marking particles. After the imaging element is marked and exposed with near-infrared radiation, the bleachable composition caused exposed portions of the imaging element to be bleached. If further bleaching is needed, the element can subsequently be exposed with near-ultraviolet radiation. A migration imaging method, which does not employ the bleachable composition of the present invention, wherein marking particles are magnetically attracted to the imaging element, is also provided.
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Bugner Douglas E.
Kamp Dennis R.
Mey William
Codd Bernard
Eastman Kodak Company
Everett John R.
Lesmes George F.
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