Fixing of tetra(hydrocarbyl)borate salt imaging systems
AssigneeMinnesota Mining and Manufacturing Company
InventorsGeorge V. D. Tiers, Steven M. Aasen, Rex J. Dalzell, Brian N. Holmes
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Abstract
Imaging systems comprising a tetra(hydrocarbyl)borate and a bleachable dye may be rendered desensitizable by the inclusion of a second bleachable dye which absorbs radiation in a different portion of the electromagnetic spectrum than the first bleachable dye.
Claims16
A desensitizable and imageable article having at least one layer comprising a tetra(hydrocarbyl)borate, a first bleachable dye, and a second bleachable dye present in a molar ratio of at least 0.8/1.0 with respect to said borate and said first bleachable dye providing an optical density to said sheet, and having a spectral absorption curve different from the said second bleachable dye wherein said second bleachable dye is a substantially non-visible dye absorbing in the infrared or ultraviolet regions of the spectrum.
A process comprising exposing a desensitizable and imageable article having at least one layer comprising a tetra(hydrocarbyl)borate, a first bleachable dye, and a second bleachable dye present in a molar ratio of at least 0.8/1.0 with respect to said borate and said first bleachable dye providing an optical density to said sheet, and having a spectral absorption curve different from the said second bleachable dye to an imagewise distribution of radiation to bleach said first bleachable dye in an imagewise fashion and then generally exposing said article to radiation to bleach said second bleachable dye.
Dependencies are inferred from the claim text.