Thermal dye bleach construction sensitive to ultraviolet radiation
US5258274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | May 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/165
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a styryl dye having a nucleus of general formula (I): ##STR1## representing the nucleus of a styryl dye in which R=methyl or ethyl group PA1 Y=alkoxy of 1 to 20 carbon atoms PA1 m=1 or 2, PA1 n=1, 2, or 3, and PA1 x.sup..crclbar. =an anion The aromatic fused benzene portion of the indolenine ring may be further substituted with commonly acceptable dye substituents such as alkyl and substituted alkyl (of 1 to 10 carbon atoms) groups, alkoxy groups (preferably of 1 to 10 carbon atoms), fused aromatic rings (as to make the benzene ring a fused naphthalene ring), halogen (including fluoro), cyano, nitro, carboxamido, amido, etc. One or two substituents chosen variously from said group may also be present on the phenyl ring to which the alkoxy group is attached. These substituents and their combinations should not be chosen so as to alter the absorption characteristics of the dye greatly enough to remove the maximum absorption from between 300 and 490 nm. X.sup..crclbar. may be any anion, but certain classes of anions and certain particular anions are preferred. Aromatic and perfluori…
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