Thermally developable emulsions and materials containing phthalazine compounds

A black-and-white thermographic material that comprises a support having thereon one or more thermally-developable imaging layers comprising a binder and in reactive association, a non-photosensitive source of reducible silver ions, and a reducing composition for said non-photosensitive source of reducible silver ions, and

• a phthalazine compound represented by the following Structure I or II:
• wherein R1 is an alkyl, cycloalkyl, alkenyl, or aryl group, R2 and R4 independently are alkyl groups, carbocyclic or heterocyclic aliphatic groups, carbocyclic or heterocyclic aromatic groups, alkoxy groups, aryloxy groups, alkylthio groups, arylthio groups, alkyl (or aryl)-SO2— groups, alkyl (or aryl)-SO— groups, —SO3H groups, —SO3− groups, halo groups, nitro groups, cyano groups, primary, secondary or tertiary amino groups, alkyl(or aryl)-(C═O)— groups, alkyl(or aryl)-(C═O)O— groups, alkyl(or aryl)—O(C═O)— groups, and R″R′″N(C═O)— groups, or R″R′″NSO2— groups, R″ and R′″ are independently hydrogen, alkyl or aryl groups, m is 0 or an integer up to 4, r is 0 or an integer of up to 4, and when m or r is greater than or equal to 2, a plurality of R2 or a plurality of R4 groups may be the same or different and when a plurality of R2 groups or a plurality of R4 groups are close to each other, they may form a fused aliphatic, aromatic, or heterocyclic ring, R3 is a multivalent organic linking group, q is 1, 2, or 3, provided that when q is 2 or 3, the R4 groups can be the same or different on the multiple phthalazine moieties, X is an anion, and n and p are 0 or an integer of up to 4 and represent sufficient counterions necessary to provide a net charge of zero.

A photothermographic material that comprises a support having thereon one or more thermally developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, a reducing composition for said non-photosensitive source reducible silver ions, and

• a phthalazine compound represented by the following Structure I or II:
• wherein R1 is an alkyl, cycloalkyl, alkenyl, or aryl group, R2 and R4 independently are alkyl groups, carbocyclic or heterocyclic aliphatic groups, carbocyclic or heterocyclic aromatic groups, alkoxy groups, aryloxy groups, alkylthio groups, arylthio groups, alkyl (or aryl)-SO2— groups, alkyl (or aryl)-SO— groups, —SO3H groups, —SO3− groups, halo groups, nitro groups, cyano groups, primary, secondary or tertiary amino groups, alkyl(or aryl)-(C═O)— groups, alkyl(or aryl)-(C═O)O— groups, alkyl(or aryl)—O(C═O)— groups, and R″R′″N(C═O)— groups, or R″R′″NSO2— groups, R″ and R′″ are independently hydrogen, alkyl or aryl groups, m is 0 or an integer up to 4, r is 0 or an integer of up to 4, and when m or r is greater than or equal to 2, a plurality of R2 or a plurality of R4 groups may be the same or different and when a plurality of R2 groups or a plurality of R4 groups are close to each other, they may form a fused aliphatic, aromatic, or heterocyclic ring, R3 is a multivalent organic linking group, q is 1, 2, or 3, provided that when q is 2 or 3, the R4 groups can be the same or different on the multiple phthalazine moieties, X is an anion, and n and p are 0 or an integer of up to 4 and represent sufficient counterions necessary to provide a net charge of zero.

A black-and-white aqueous-based photothermographic material that comprises a transparent support having a front side thereof:

• a) one or more thermally developable imaging layers each comprising a hydrophilic binder, and in reactive association,
• a preformed photosensitive silver bromide or silver iodobromide provided in predominantly as tabular grains,
• a non-photosensitive source of reducible silver ions that includes one or more silver carboxylates at least one of which is silver salt of benzotriazole,
• a reducing composition for said non-photosensitive source reducible silver ions that includes at least one hindered phenol or an ascorbic acid, and
• b) a protective overcoat disposed over said one or more thermally developable imaging layers,
• wherein said one or more thermally developable imaging layers further comprises a phthalazine compound represented by the following Compounds I-1 and I-3: