Silver halide emulsion
AssigneeFuji Photo Film Co., Ltd.
InventorTakanori Hioki
Life of this patent
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Abstract
Disclosed is a silver halide emulsion having at least one methine compound of formula (I) (MET).sub.k1 --[(Q) --Ar].sub.k2, wherein MET represents an atomic group having a methine compound structure; Q represents a divalent linking group composed of atom(s) or atomic group(s) containing at least one carbon, nitrogen, sulfur or oxygen atom; Ar represents an aromatic group containing monocyclic compound(s) each composed of 5 or more atoms; k1 represents an integer of 1 or more; and k2 represents an integer of 2 or more. A photographic material containing the emulsion has high sensitivity and high storage stability.
Claims12
A silver halide emulsion containing at least one methine compound of general formula (I):
- (MET).sub.k1 --[(Q)--Ar].sub.k2 (I)
- wherein
- Q represents a divalent linking group composed of one or more than one atoms or one or more than one atomic groups containing at least one carbon, nitrogen, sulfur or oxygen atom;
- Ar represents an aromatic group containing one monocyclic compound each composed of 5 or more atoms;
- k1 represents an integer of 1;
- and
- k2 represents an integer of 2 or more;
- wherein the methine compound of formula (I) has an oxidation potential of 0.60 (VvsSCE) or less;
- and wherein MET in formula (I) represents an atomic group which has a hexamethine-merocyanine structure of general formula (II) or a heptamethine-cyanine structure of general formula (III):
- ##STR15## wherein Z.sub.1, Z.sub.2 and Z.sub.3 each represents an atomic group necessary for forming a 5-membered or 6-membered nitrogen-containing hetero ring;
- the dotted line between D and D' groups may or may not indicate that those groups are linked;
- D and D' each represents an atomic group necessary for forming a non-cyclic or cyclic acidic nucleus;
- R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, wherein the substituent --(Q)--Ar groups are substituted onto any of R.sub.1, R.sub.2 and R.sub.3 or on the nitrogen atoms in the acidic nucleus of D or D';
- L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7, L.sub.8, L.sub.9, L.sub.10, L.sub.11, L.sub.12, L.sub.13, L.sub.14, L.sub.15, L.sub.16, L.sub.17, L.sub.18, L.sub.19, L.sub.20 and L.sub.21 each represents a methine group or a substituted methine group, wherein at least one combination of L.sub.2 and L.sub.4, L.sub.3 and L.sub.5, and L.sub.4 and L.sub.6 forms a ring and wherein at least one combination of L.sub.12 and L.sub.14, L.sub.13 and L.sub.15, and L.sub.14 and L.sub.16 forms a ring;
- n.sub.1, n.sub.2, n.sub.3 and n.sub.4 each represents 0 or 1;
- M.sub.1 and M.sub.2 each represents a charge-neutralizing pair ion;
- and
- m.sub.1 and m.sub.z each represents a number of 0 or more which is necessary for neutralizing the charge in the atomic group.
A silver halide photographic material comprising a support having provided thereon at least one silver halide emulsion layer, said at least one silver halide emulsion layer containing at least one methine compound of general formula (I):
- (MET).sub.k1 --[(Q)--Ar].sub.k2 (I)
- Q represents a divalent linking group composed of one or more than one atoms or one or more than one atomic groups containing at least one carbon, nitrogen, sulfur or oxygen atom;
- Ar represents an aromatic group containing one monocyclic compound each composed of 5 or more atoms;
- k1 represents an integer of 1;
- and
- k2 represents an integer of 2 or more;
- wherein the methine compound of formula (I) has an oxidation potential of 0.60 (VvsSCE) or less;
- and wherein MET in formula (I) represents an atomic group which has a hexamethine-merocyanine structure of general formula (II) or a heptamethine-cyanine structure of general formula (III):
- ##STR16## wherein Z.sub.1, Z.sub.2 and Z.sub.3 each represents an atomic group necessary for forming a 5-membered or 6-membered nitrogen-containing hetero ring;
- the dotted line between D and D' groups may or may not indicate that those groups are linked;
- D and D' each represents an atomic group necessary for forming a non-cyclic or cyclic acidic nucleus;
- R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, wherein the substituent --(Q)--Ar groups are substituted onto any of R.sub.1, R.sub.2 and R.sub.3 or on the nitrogen atoms in the acidic nucleus of D or D';
- L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7, L.sub.8, L.sub.9, L.sub.10, L.sub.11, L.sub.12, L.sub.13, L.sub.14, L.sub.15, L.sub.16, L.sub.17, L.sub.18, L.sub.19, L.sub.20 and L.sub.21 each represents a methine group or a substituted methine group, wherein at least one combination of L.sub.2 and L.sub.4, L.sub.3 and L.sub.5, and L.sub.4 and L.sub.6 forms a ring and wherein at least one combination of L.sub.12 and L.sub.14, L.sub.13 and L.sub.15, and L.sub.14 and L.sub.16 forms a ring;
- n.sub.1, n.sub.2, n.sub.3 and n.sub.4 each represents 0 or 1;
- M.sub.1 and M.sub.2 each represents a charge-neutralizing pair ion;
- and
- m.sub.1 and m.sub.2 each represents a number of 0 or more which is necessary for neutralizing the charge in the atomic group.
Dependencies are inferred from the claim text.