Photosensitive reproduction elements for forming negative tonable images
AssigneeE. I. Du Pont de Nemours and Company
InventorWerner Abele
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Abstract
A nonsilver photosensitive reproduction element which comprises a support bearing a layer of a photosensitive composition which comprises (1) at least one thermoplastic binder, (2) a photosensitive system consisting essentially of (a) a hexaarylbiimidazole compound and (b) a dihydropyridine compound; and optionally (3) a plasticizer, and (4) a thioamide, thiolactam or thiocarbanilic acid ester of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are as defined. The photosensitive element is useful in preparing negative tonable images.
Claims6
Photosensitive nonsilver reproduction element for the preparation of negative tonable images comprising a support bearing a layer of a photosensitive composition which comprises
- (1) at least one thermoplastic binder,
- (2) a photosensitive system consisting essentially of
- (a) at least one hexaarylbisimidazole compound;
- (b) a dihydropyridine compound;
- and
- (c) a thioamide, thiolactam or thiocarbanilic acid ester of the formula:
- ##STR6## wherein R.sub.1 and R.sub.2 can be the same or different and can be H, alkyl of 1 to 4 carbon atoms and aryl of 6 to 10 carbon atoms;
- R.sub.1 is aryl of 6 to 10 carbon atoms and R.sub.2 is either oxyalkyl wherein alkyl is of 1 to 8 carbon atoms or thioaryl wherein aryl is phenyl, tolyl, naphthyl;
- and R.sub.1 and R.sub.2 when taken together can be members of a 5 to 7 membered heterocyclic ring which may contain oxygen, sulfur and nitrogen as additional heteroatoms;
- and optionally (3) a plasticizer.
Dependencies are inferred from the claim text.