Photothermographic material
OwnerTokuju Oikawainventor
Life of this patent
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Abstract
In a photothermographic material having an image-forming layer and a protective layer on a support, (A) a nucleating agent having a particular structure is added to at least one of the layers formed on the image-forming layer side of the support and NH4+ content in all the layers formed on the image-forming layer side is controlled to be 0.06 mmol/m2 or less, or (B) a nucleating agent and an organic acid compound having a particular structure are added to at least one of the layers formed on the image-forming layer side so that film surface pH is substantially unchanged. This photothermographic material is characterized by low fog, high Dmax, little increase of fog during storage and little temperature and humidity dependency upon heat development.
Claims20
A photothermographic material having, on a support, at least an image-forming layer containing a non-photosensitive silver salt, a photosensitive silver halide and a binder and a protective layer outer than the image-forming layer on the support, and the photothermographic material satisfies at least one of the following Conditions I and II:
- Condition I
- At least one of the layers formed on the image-forming layer side of the support contains at least one compound selected from compounds represented by the following formula (1), (2) or (3), and the NH4+ content in all the layers formed on the image-forming layer side of the support is 0.06 mmol/m2 or less:
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- wherein:
- in the formula (1), R1, R2 and R3 each independently represents a hydrogen atom or a substituent, Z represents an electron-withdrawing group, and R1 and Z, R2 and R3, R1 and R2, or R3 and Z may be combined with each other to form a ring structure,
- in the formula (2), R4 represents a substituent,
- in the formula (3), X and Y each independently represents a hydrogen atom or a substituent, A and B each independently represents an alkoxy group, an alkylthio group, an alkylamino group, an aryloxy group, an arylthio group, an anilino group, a heterocyclyloxy group, a heterocyclylthio group or a heterocyclylamino group, and X and Y or A and B may be combined with each other to form a ring structure:
- Condition II
- At least one of the layers formed on the image-forming layer side of the support contains a nucleating agent, and at least one of the layers formed on the image-forming layer side of the support contains at least one compound represented by the following formula (A) and film surface pH of the image-forming layer side of the support is substantially unchanged:
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- wherein:
- in the formula (A), T represents a monovalent substituent, k represents an integer of 0-4;
- when k is 2 or more, two or more of T may be the same or different from each other or one another and may be bonded together to form a ring;
- L1 and L2 each independently represents a bridging group;
- and n1 and n2 each independently represents an integer of 0-30.
Dependencies are inferred from the claim text.