2-substituted malondialdehyde compounds as co-developers for black-and-white photothermographic and thermographic elements
AssigneeMinnesota Mining and Manufacturing Company
InventorThomas J. Murray
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Abstract
2-Substituted malondialdehyde compounds are useful as co-developers in combination with hindered phenol developers to produce high contrast black-and-white photothermographic and thermographic elements. The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.
Claims27
A black-and-white photothermographic element comprising a support bearing at least one photosensitive, image-forming, photothermographic emulsion layer comprising:
- (a) a photosensitive silver halide;
- (b) a non-photosensitive, reducible silver source;
- (c) a reducing agent system for silver ion;
- and
- (d) a binder;
- wherein the reducing agent system comprises:
- (i) at least one hindered phenol;
- and
- (ii) at least one 2-substituted malondialdehyde compound of the formula ##STR9## wherein:
- R represents an aryl group or an electron withdrawing group.
A black-and-white thermographic element comprising a support bearing at least one, image-forming, thermographic emulsion layer comprising:
- (a) a non-photosensitive, reducible silver source;
- (b) a reducing agent system for silver ion;
- and
- (c) a binder;
- wherein said reducing agent system comprises:
- (i) at least one hindered phenol;
- and
- (ii) at least one co-developer of the formula ##STR10## wherein:
- R represents an aryl group or an electron withdrawing group.
Dependencies are inferred from the claim text.