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US 7,029,834 B2Granted
Thermally developable imaging materials having backside stabilizers
AssigneeEastman Kodak Company
InventorsSteven H. Kong, Kumars Sakizadeh
Life of this patent
Estimating the term…
Abstract
Thermally developable photothermographic materials comprise a backside layer that includes a backside stabilizer to reduce fog formation in high humidity conditions, thereby providing improved shelf stability. Useful backside stabilizers are nitrogen-containing aromatic heterocyclic compounds. These backside stabilizers can be provided particularly in non-photosensitive compositions that include an antihalation composition.
Claims24
A photothermographic material that comprises a support having on a frontside thereof, 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, and a reducing composition for said non-photosensitive source reducible silver ions,
- and on a nonphotosensitive backside of said support, a backside layer comprising a binder and a backside stabilizer present in an amount of at least 0.01 mmol/m2,
- said backside stabilizer being a nitrogen-containing aromatic heterocyclic compound represented by one of the following Structures I and II:
- wherein each X in Structure I is independently N, or C—R4 provided that at least one of X is N, and each X in Structure II is independently N, N—R2, or provided that no more than 3 of X is N or N—R2,
- m is 1 or 2, and
- when m is 1, R1 represents one hydroxy group or represents one or more of the same or different groups that are hydrogen, mercapto, carboxy, alkyl or aryl carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, alkenyl, halo, or haloalkyl groups, or two adjacent R1 groups can be combined to form a substituted or unsubstituted alicyclic, heterocyclic, aromatic, or heteroaromatic fused ring,
- R3 represents hydrogen, hydroxy, carboxy, alkyl or aryl carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, alkenyl, halo, or haloalkyl groups,
- R2 represents hydrogen, alkyl, or alkali metal groups,
- R4 represents one or more of the same or different groups that are hydrogen, halo, carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, or alkenyl groups, or two adjacent R4, or R1 and R4, or R2 and R4, or R3 and R4 groups can be combined within their respective structures to form a substituted or unsubstituted alicyclic, heterocyclic, aromatic, or heteroaromatic fused ring,
- R5 represents hydrogen, alkyl, alkenyl, alicyclic, heterocyclic, aryl, or heteroaryl groups, and
- when m is 2, each L independently represents a direct bond or a non-conjugated organic linking group comprising from 1 to 5 carbon atoms in the chain.
7 more elements
A photothermographic material that comprises a transparent polymer support having on a frontside thereof:
- a) one or more thermally-developable imaging layers comprising a hydrophobic binder and in reactive association:
- a photosensitive silver bromide, silver iodobromide, or a mixture thereof,
- a non-photosensitive source of reducible silver ions that comprises one or more silver carboxylates at least one of which is silver behenate,
- a reducing composition for said non-photosensitive source reducible silver ions, and
- b) on a non-photosensitive backside of said support, an antihalation layer comprising an antihalation composition and a backside stabilizer that is one or more of the following compounds NCH-1 through NCH-29 and NCH-31 through NCH-35, or a mixture of two or more of these compounds, said backside stabilizer being present in an amount of from about 0.05 to about 2 mmol/m2:
2 more elements
A photographic film pack or stack comprising a plurality of photothermographic materials,
- each photothermographic material comprising a support having, on a frontside thereof, 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, and a reducing composition for said non-photosensitive source reducible silver ions,
- and on a nonphotosensitive backside of said support, a backside layer comprising a binder and a backside stabilizer present in an amount of at least 0.01 mmol/m2,
- said backside stabilizer being a nitrogen-containing aromatic heterocyclic compound represented by one of the following Structures I and II:
- wherein each X in Structure I is independently N, or C—R4 provided that at least one of X is N, and each X in Structure II is independently N, N—R2, or C—R4, provided that no more than 3 of X is N or N—R2,
- m is 1 or 2, and
- when m is 1, R1 represents one hydroxy group or represents one or more of the same or different groups that are hydrogen, mercapto, carboxy, alkyl or aryl carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, alkenyl, halo, or haloalkyl groups, or two adjacent R1 groups can be combined to form a substituted or unsubstituted alicyclic, heterocyclic, aromatic, or heteroaromatic fused ring,
- R3 represents hydrogen, hydroxy, carboxy, alkyl or aryl carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, alkenyl, halo, or haloalkyl groups,
- R2, represents hydrogen, alkyl, or alkali metal groups,
- R4 represents one or more of the same or different groups that are hydrogen, halo, carboxy, alkyl or aryl sulfonyl, alkyl, aryl, alkyloxy, aryloxy, or alkenyl groups, or two adjacent R4, or R1 and R4, or R2 and R4, or R3 and R4 groups can be combined within their respective structures to form a substituted or unsubstituted alicyclic, heterocyclic, aromatic, or heteroaromatic fused ring,
- R5 represents hydrogen, alkyl, alkenyl, alicyclic, heterocyclic, aryl, or heteroaryl groups, and
- when m is 2, each L independently represents a direct bond or a non-conjugated organic linking group comprising from 1 to 5 carbon atoms in the chain.
8 more elements
Dependencies are inferred from the claim text.