Amine compounds as contrast enhancers for black-and-white photothermographic and thermographic elements
AssigneeMinnesota Mining and Manufacturing Company
InventorSharon M. Simpson
Life of this patent
Estimating the term…
Abstract
Hydroxylamine, alkanolamine, and ammonium phthalamate compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-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.
Claims37
A black-and-white photothermographic element comprising a support bearing at least one photosensitive, black-and-white image-forming, photothermographic emulsion layer comprising:
- (a) a photosensitive silver halide;
- (b) a non-photosensitive, reducible silver source;
- (c) a reducing agent system for said non-photosensitive, reducible silver source;
- and
- (d) a binder;
- wherein said reducing agent system comprises:
- (i) at least one hindered phenol;
- (ii) at least one co-developer of the formula
- R.sup.1 --(C.dbd.O)--NHNH--R.sup.2
- wherein:
- R.sup.1 represents hydrogen and R.sup.2 represents an aryl or substituted aryl group;
- or,
- R.sup.1 represents hydrogen, alkyl, or alkenyl groups of 1 to 20 carbon atoms;
- alkoxy, alkylthio, or amido groups of 1 and 20 carbon atoms;
- aryl, alkaryl, or aralkyl groups of up to 20 carbon atoms;
- aryloxy, arylthio, or anilino groups of up to 20 carbon atoms;
- aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms;
- carbocyclic ring groups comprising up to 6 ring carbon atoms;
- and R.sup.2 represents a trityl group;
- and
- (iii) a hydroxylamine, an alkanolamine, or an ammonium phthalamate compound.
A black-and-white thermographic element comprising a support bearing at least one, black-and-white image-forming, thermographic emulsion layer comprising:
- (a) a non-photosensitive, reducible silver source;
- (b) a reducing agent system for said non-photosensitive, reducible silver source;
- and
- (c) a binder;
- wherein said reducing agent system comprises:
- (i) at least one hindered phenol;
- (ii) at least one co-developer of the formula
- R.sup.1 --(C.dbd.O)--NHNH--R.sup.2
- wherein:
- R.sup.1 represents hydrogen and R.sup.2 represents an aryl or substituted aryl group;
- or,
- R.sup.1 represents hydrogen, alkyl or alkenyl groups of 1 to 20 carbon atoms;
- alkoxy, alkylthio, or amido groups of 1 and 20 carbon atoms;
- aryl, alkaryl, or aralkyl groups of up to 20 carbon atoms;
- aryloxy, arylthio, or anilino groups of up to 20 carbon atoms;
- aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms;
- carbocyclic ring groups comprising up to 6 ring carbon atoms;
- and R.sup.2 represents a trityl group;
- and
- (iii) a hydroxylamine, an alkanolamine, or an ammonium phthalamate compound.
A black-and-white photothermographic element comprising a support bearing at least one photosensitive, black-and-white image-forming, photothermographic emulsion layer comprising:
- (a) a photosensitive silver halide;
- (b) a non-photosensitive, reducible silver source;
- (c) a reducing agent system for said non-photosensitive, reducible silver source;
- and
- (d) a binder;
- wherein said reducing agent system comprises:
- (i) at least one hindered phenol;
- (ii) at least one co-developer of the formula
- R.sup.1 --(C.dbd.O)--NHNH--R.sup.2
- wherein:
- R.sup.1 represents hydrogen and R.sup.2 represents an aryl or substituted aryl group;
- or,
- R.sup.1 represents hydrogen, alkyl, or alkenyl groups of 1 to 20 carbon atoms;
- alkoxy, alkylthio, or amido groups of 1 and 20 carbon atoms;
- aryl, alkaryl, or aralkyl groups of up to 20 carbon atoms;
- aryloxy, arylthio, or anilino groups of up to 20 carbon atoms;
- aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms;
- carbocyclic ring groups comprising up to 6 ring carbon atoms;
- and R.sup.2 represents a trityl group;
- and
- (iii) an alkanolamine, or an ammonium phthalamate compound.
Dependencies are inferred from the claim text.