Thermographic or photothermographic image recording elements
AssigneeFuji Photo Film Co., Ltd.
InventorsNaoki Asanuma, Tatsuya Ishizaka, Hisashi Okamura
Life of this patent
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Abstract
Thermographic or photothermographic image recording elements comprising (a) a reducible silver salt, (b) a reducing agent, (c) a binder, (d) a specific phthalazine derivative and (e) an organic acid compound experience a minimized drop of image density when stored under warm humid conditions.
Claims17
A thermographic or photothermographic image recording element comprising (a) a reducible silver salt, (b) a reducing agent, (c) a binder, (d) a compound of formula (I-a):
- ##STR44## wherein R.sub.1 is an alkyl, aryl, alkoxy, aryloxy, halogen, cyano or nitro group and is attached to the benzene ring in formula (I-a), and m.sub.1 is an integer of 1 to 4, with the proviso that when m.sub.1 .gtoreq.2, a plurality of R.sub.1 groups may be the same or different, and a plurality of R.sub.1 groups may form an aromatic ring or a heterocyclic ring, and (e) an organic acid compound of formula (II):
- ##STR45## wherein A represents an n-valent aromatic ring group which is a monocyclic or fused ring, Y represents --COOH, --SO.sub.2 H or --SO.sub.3 H, and n is equal to 1 or 2.
A thermographic or photothermographic image recording element comprising (a) a reducible silver salt, (b) a reducing agent, (c) a binder, (d) a compound of formula (I-a):
- wherein R.sub.1 is an alkyl, aryl, alkoxy, aryloxy, halogen, cyano or nitro group and is attached to the benzene ring in formula (I-a), and m.sub.1 is an integer of 1 to 4, with the proviso that when m.sub.1 .gtoreq.2, a plurality of R.sub.1 groups may be the same or different, and (e) an organic acid compound of the general formula (II);
- ##STR52## wherein A represents an n-valent monocyclic or fused ring aromatic ring group, Y represents --COOH, --SO.sub.2 H or --SO.sub.3 H, and n is equal to 1 or 2.
Dependencies are inferred from the claim text.