Photographic silver halide emulsion containing tabular grains of high chloride content

Claim 2

A photographic silver halide emulsion comprising high silver chloride content tabular grains wherein at least 50 mol% of the silver halide is a chloride and at least 50%, based on the total projected area of emulsion grains, are the tabular grains having a ratio of diameter corresponding to a circle of the projected area to thickness of from 3/1 to 8/1.

Claim 3

A photographic silver halide emulsion as in claim 1, wherein the silver chloride content of the silver halide is not less than 70 mol%.

Claim 4

A photographic silver halide emulsion as in claim 1, wherein the silver chloride content of the silver halide is not less than 90 mol%.

Claim 5

A photographic silver halide emulsion as in claim 1, wherein the average volume weighted by volume of silver halide grains is not more than 0.8 μm 3 .

Claim 6

A photographic silver halide emulsion as in claim 1, wherein a layer comprising mainly silver bromide is localized on the surface of the silver halide grains.

Claim 7

A photographic silver halide emulsion as in claim 5, wherein the amount of the silver bromide in the layer comprising mainly silver bromide is from 0.01 to 10 mol% based on the total silver halide.

Claim 8

A photographic silver halide emulsion as in claim 1, wherein the high silver chloride content tabular grains are formed in the presence of a compound represented by formula (I) ##STR11## wherein Z 1 is an atomic group forming a substituted or unsubstituted saturated or unsaturated heterocyclic ring in combination with a sulfur atom.

Claim 9

A photographic silver halide emulsion as in claim 1, wherein the high silver chloride content tabular grains are formed in the presence of a compound represented by formula (II) ##STR12## wherein Z 2 represents an unsubstituted or substituted atomic group forming a 5- or 6-membered saturated or unsaturated heterocyclic ring in combination with a sulfur atom and a carbonyl group, and n represents 1, 2, or 3.

Claim 10

A photographic silver halide emulsion as in claim 1, wherein the high silver halide chloride content tabular grains are subjected to spectral sensitization using a sensitizating dye represented by formula (Ia) ##STR13## wherein Z 11 is an oxygen atom, a sulfur atom, or a selenium atom, and Z 12 is a sulfur atom or a selenium atom; R 11 and R 12 are substituted or unsubstituted alkyl or alkenyl groups having not more than 6 carbon atoms, provided that one of R 11 and R 12 is a sulfo substituted alkyl group; V 11 is a hydrogen atom, or an alkoxy or alkyl group having not more than 4 carbon atoms; V 14 is a hydrogen atom, an alkoxy group having not more than 4 carbon atoms, or alkyl group having not more than 5 carbon atoms; when Z 11 is an oxygen atom, V 12 represents a phenyl group, or V 12 and V 13 are linked to each other to form a condensed benzene ring; when Z 11 is a sulfur atom or a selenium atom, V 12 represents an alkoxy group having not more than 4 carbon atoms, a substituted or unsubstituted phenyl group, or a chlorine atom, or V 12 and V 13 are linked to each other to form a condensed benzene ring; when Z 12 is a selenium atom, V 15 represents an alkoxy group having not more than 4 carbon atoms, a chlorine atom, or a substituted or unsubstituted phenyl group, or V 15 and V 16 are linked to each other to form a condensed benzene ring; when Z 12 is a sulfur atom, V 15 represents a substituted or unsubstituted phenyl group, or V 15 and V 16 are linked to each other to form a condensed benzene ring; X 11 .sup.⊖ is an acid anion radical; and m 11 is 0 or 1.

Claim 11

A photographic silver halide emulsion as in claim 1, wherein the high silver halide content tabular grains are subjected to spectral sensitization using a sensitizing dye represented by formula (IIa) ##STR14## wherein Z 21 and Z 22 are each an oxygen atom, a sulfur atom, a selenium atom, or N-R 26 ; R 21 and R 22 are substituted or unsubstituted alkyl or alkenyl groups having not more than 6 carbon atoms, provided that one of R 21 and R 22 is a sulfo substituted alkyl group, but when n 21 is 2 or 3, cannot be a sulfo group having substituents at the same time; when at least one of Z 21 and Z 22 is N-R 26 , R 23 is a hydrogen atom; when neither Z 21 nor Z 22 is N-R 26 , R 23 is a lower alkyl group or a phenetyl group; when n 21 is 2 or 3, different R 23 groups are linked to each other to form a 5- or 6-membered ring; R 24 and R 25 are each a hydrogen atom; when Z 21 is an oxygen atom, V 21 is a hydrogen atom; when Z 21 is a sulfur atom or a selenium atom, V 21 is a hydrogen atom, an alkyl group having not more than 5 carbon atoms, or an alkoxy group having not more than 5 carbon atoms; when Z 21 is N-R 26 , V 21 is a hydrogen atom or a chlorine atom; when Z 22 is an oxygen atom, V 22 is a hydrogen atom; when Z 22 is a sulfur atom or a selenium atom, V 22 is a hydrogen atom, an alkyl group having not more than 5 carbon atoms, or an alkoxy group having not more than 5 carbon atoms; when Z 21 is N-R 26 , V 22 is a hydrogen atom or a chlorine atom; when Z 21 is N-R 26 , V 22 represents a chlorine atom, a trifluoromethyl group or a cyano group; when Z 22 is N-R 26 , V 25 represents a chlorine atom, a trifluoromethyl group or a cyano group; when Z 21 is an oxygen atom, a sulfur atom, or a selenium atom, V 22 represents an alkoxy group having not more than 5 carbon atoms or a substituted or unsubstituted phenyl group, or V 22 and V 23 are linked to each other to form a condensed benzene ring; when Z 22 is an oxygen atom, a sulfur atom, or a selenium atom, V 25 represents an alkoxy group having not more than 5 carbon atoms or a substituted or unsubstituted phenyl group, or V 25 and V 26 are linked to each other to form a condensed benzene ring; further, when Z 21 is an oxygen atom, V 21 and V 22 are linked to each other to form a condensed benzene ring; when Z 22 is an oxygen atom, V 25 and V 24 are linked to each other to form a condensed benzene ring; V 26 is a hydrogen atom; X 21 .sup.⊖ is an acid anion radical; m 21 is 0 or 1; and n 21 is 1 or 2.

Claim 12

A photographic silver halide emulsion as in claim 1, wherein the high silver halide chloride content tabular grains are subjected to spectral sensitization using a sensitizing dye represented by formula (IIIa) ##STR15## wherein Z 31 is an atomic group to form a substituted or unsubstituted heterocyclic nucleus selected from thiazoline, thiazole, benzothiazole, naphthothiazole, selenazoline, selenazole, benzoselenazole, naphthoselenazole, benzimidazole, naphthoimidazole, oxazole, benzoxazole, naphthooxazole, and pyridine; R 33 is a hydrogen atom, an alkyl group having not more than 5 carbon atoms, a phenetyl group, a phenyl group, or a 2-carboxyphenyl group; R 31 and R 32 are substituted or unsubstituted alkyl or alkenyl groups having not more than 6 carbon atoms, provided that one of R 31 and R 32 is a sulfo substituted alkyl group; Q 31 is a sulfur atom or N-R 34 ; n 31 is 0, 1, or 2; and k is 0 or 1.

Claim 13

A color printing paper having formed thereon at least one layer comprising a photographic silver halide emulsion wherein at least 50 mol% of the silver halide is a chloride and at least 50%, based on the total projected area of emulsion grains, are tabular grains having a ratio of diameter corresponding to a circle of the projected area to particle thickness of from 2/1 to 10/1.

Claim 14

A color printing paper having formed thereon at least one layer comprising a photographic silver halide emulsion wherein at least 50 mol% of the silver halide is a chloride and at least 50%, based on the total projected area of emulsion grains, are tabular grains having a ratio of diameter corresponding to a circle of the projected area to particle thickness of from 2/1 to 10/1.

Claim 15

A color printing paper as in claim 12, wherein as a magenta coupler at least one coupler selected from a 5-pyrazolone coupler, a pyrazolobenzimidazole coupler, a pyrazolotriazole coupler, and a pyrazolotetrazole coupler, and as the cyan coupler, at least one coupler selected from a coupler having an ethyl group in the meta-position of a phenolic nucleus, a 2,5-diacylamino substituted phenolic coupler, a phenolic coupler having an acylamino group in the 5-position and a phenylureido group in the 2-position, and a coupler substituted by a sulfonamide group or an amide group in the 5-position of a naphtholic group is used.