Radiation imagery chemistry: process – composition – or product th – Dye image from radiation sensitive dye or dye former by dry... – Multiple image formation – multiple image exposure – or...
Patent
1995-01-20
1996-11-26
Letscher, Geraldine
Radiation imagery chemistry: process, composition, or product th
Dye image from radiation sensitive dye or dye former by dry...
Multiple image formation, multiple image exposure, or...
430332, 430336, 430944, G03C 1725, G03C 173, G03C 1735, G03C 500
Patent
active
055784240
ABSTRACT:
Acid can be generated by exposing a mixture of a superacid precursor and a dye to actinic radiation of a first wavelength which does not, in the absence of the dye, cause decomposition of the superacid precursor to form the corresponding superacid, thereby causing absorption of the actinic radiation and decomposition of part of the superacid precursor, with formation of a protonated product derived from the dye, then irradiating the mixture with actinic radiation of a second wavelength, thereby causing decomposition of part of the remaining superacid precursor, with formation of unbuffered superacid. Preferably, following these irradiations, the imaging medium is heated while the superacid is admixed with a secondary acid generator capable of being thermally decomposed to form a second acid, the thermal decomposition of the secondary acid generator being catalyzed by the presence of the superacid. The acid generation process may be used for imaging by bringing the superacid or second acid into contact with an acid-sensitive material which changes color on contact with acid, or the superacid may be used to trigger polymerization, depolymerization or other reactions.
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Grasshoff Jurgen M.
Marshall John L.
Minns Richard A.
Puttick Anthony J.
Taylor Lloyd D.
Cole David J.
Letscher Geraldine
Polaroid Corporation
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