Cinnamal-nitrile dyes for laser recording element
AssigneeEastman Kodak Company
InventorLee W. Tutt
Life of this patent
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Abstract
A laser recording element comprising a support having thereon a dye layer comprising an image dye dispersed in a polymeric binder, said dye layer having an infrared-absorbing material associated therewith, and wherein said dye layer also contains a cinnamal-nitrile UV-absorbing dye.
Claims6
A laser recording element comprising a support having thereon a dye layer comprising an image dye dispersed in a polymeric binder, said dye layer having an infrared-absorbing material associated therewith, and wherein said image dye is a cinnamal-nitrile UV-absorbing dye, with a .lambda.-max in the UV of 300 -400 nm, wherein said cinnamal-nitrile UV-absorbing dye has the following structure:
- ##STR5## wherein R.sub.2 represents hydrogen or an alkyl group having from 1 to about 6 carbon atoms;
- R.sub.2 represents cyano or a carboxylic ester group;
- and
- R.sub.3 -R.sub.7 each independently represents hydrogen, cyano, alkoxy, an alkyl group having from 1 to about 6 carbon atoms, nitro, a carboxylic ester group or an electron-withdrawing moiety.
A process of forming a dye image comprising imagewise-heating, by means of a laser, a recording element comprising a support having thereon a dye layer comprising an image dye dispersed in a polymeric binder, said dye layer having an infrared-absorbing material associated therewith, said laser exposure taking place through the dye side of said element and causing dye to be removed imagewise to obtain said dye image in said recording element, wherein said image dye is a cinnamal-nitrile UV-absorbing dye, with a .lambda.-max in the UV of 300 -400 nm, wherein said cinnamal-nitrile UV-absorbing dye has the following structure:
- ##STR6## wherein R.sub.1 represents hydrogen or an alkyl group having from 1 to about 6 carbon atoms;
- R.sub.2 represents cyano or a carboxylic ester group;
- and
- R.sub.3 -R.sub.7 each independently represents hydrogen, cyano, alkoxy, an alkyl group having from 1 to about 6 carbon atoms, nitro, a carboxylic ester group or an electron-withdrawing moiety,
- whereby a dye image is obtained having improved stability to UV density loss from light exposure.
Dependencies are inferred from the claim text.