Organic compounds -- part of the class 532-570 series – Organic compounds – Hydroxamic acids – chalcogen analogs or salts thereof
Reexamination Certificate
2000-02-25
2002-08-13
Killos, Paul J. (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Hydroxamic acids, chalcogen analogs or salts thereof
C562S623000, C562S567000
Reexamination Certificate
active
06433223
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a light-sensitive silver halide photographic material and, more particularly, to a photographic material which generates less fluctuation in photographic capabilities after storage and generates less fluctuation in photographic capabilities after photographing until development processing.
Further, the present invention relates to a silver halide photographic material which generates less fog.
Still further, the present invention relates to a novel hydroxamic acid based compound which provides photographically useful effect.
BACKGROUND OF THE INVENTION
In a silver halide color photographic material, it is required, as well as high sensitivity, that fluctuations in photographic characteristics are less during storage after manufacture of a photographic material and also after photographing until development processing.
Of the fluctuations in photographic characteristics after photographing until development processing, with respect to the prevention of latensification, a method by the combined use of a hardening agent having an active vinyl group with a triazine based compound is disclosed, for example, in JP-A-59-162546 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”).
However, the above method is not sufficient in the preventing effect and a further improvement has been desired.
On the other hand, in a full color photographic material, a multilayer structure comprising a plurality of emulsions having different spectral sensitivities is used to achieve the object of a full color photograph. However, although the emulsions for such a usage have been considerably improved, fog, intensification and fading of a latent image are liable to occur, therefore, they are not necessarily sufficient. 2-Hydroxyamino-1,3,5-triazines, for example, are useful for the improvement of such storage stabilities. However, the above storage stability improver used in each layer varies according to the emulsion used in each layer. Accordingly, a method to improve the storage stability of the latent image of the emulsion of rather a specific layer has been strongly desired in recent years.
Many of known 2-hydroxylamine-1,3,5-triazines are diffusible, therefore, these compounds have a drawback such that their function is exerted also to emulsions of layers other than the objective layer. On the other hand, hydroxamic acids having specific structures are disclosed in JP-A-59-198453 and JP-A-3-293666, but their use purposes are different from the object of the present invention and, further, their effect of the improvement of the storage stability of a latent image and the function to the emulsion of solely a specific layer are not sufficient. Accordingly, the development of a method to largely improve the storage stability of the latent image of only the objective layer has been strongly desired.
The present invention is to provide a method for improving the above-described storage stability of the emulsion and the stability of the latent image of a specific layer.
The present inventors have eagerly studied the method of improving the storage stability of an emulsion produced and the storage stability of a latent image to solve the above problems. As a result of various investigations particularly about the carbon atom number and the kind of substituents of storage stability improvers, a completely novel N-alkylhydroxamic acid based compound of the present invention which has a specific substituent and a carbon atom number has been discovered.
Further, it has been found that the compound of the present invention can achieve the objects of the present invention, when added to a silver halide photographic material, without changing the hue of the dye formed, affecting the dye-forming speed of a coupler, accelerating the decomposition of a coupler and the dye formed, deteriorating the film strength, or fogging an emulsion.
Still further, it has been found that the hydroxamic acid based compound according to the present invention shows a sufficient improving effect of the storage stability of a latent image and an emulsion with a reduced amount of addition.
Moreover, the compound according to the present invention is a completely novel compound which has not been known in the past. The photographic usefulness of this compound has become clear solely by the investigations of the present inventors.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a compound which is very effective to improve the storage stability of a silver halide emulsion and the storage stability of a latent image and also to provide a method for improving the storage stability of a latent image using said compound.
Another object of the present invention is to provide a compound which can improve the storage stability of the latent image of solely a specific layer and also to provide a method for improving the storage stability of a latent image using said compound.
A further object of the present invention is to provide a compound which can improve the storage stability of a latent image without adversely affecting various photographic characteristics when added to a photographic material and also to provide a method for improving the storage stability of a latent image using said compound.
A still further object of the present invent on is to provide a compound which can achieve a sufficient improvement of the storage stability of a latent image and the storage stability of an emulsion with a reduced amount of addition.
The above objects of the present invention have been achieved by the following (1), (2) and (3).
(1) A silver halide photographic material which contains the compound represented by the following formula (I):
wherein R
1
represents a substituted or unsubstituted alkylene group having from 1 to 5 carbon atoms; X represents a water-soluble group; and R represents a substituted or unsubstituted alkyl group having the sum total of from 14 to 40 carbon atoms, an alkenyl group, an aryl group, an alkoxyl group, —NR
3
R
4
(R
3
and R
4
each independently represents an alkyl group having from 1 to 40 carbon atoms, a hydrogen atom, or an aryl group), a bicycloalkyl group, a bicycloalkenyl group, a cycloalkyl group, a cycloalkenyl group or a heterocyclic group, provided that when X represents a quaternary ammonium salt structure, R
2
does not represent an alkyl group having from 14 to 17 carbon atoms.
(2) The silver halide photographic material described in the above (1), wherein R
1
represents a substituted or unsubstituted alkylene group having from 1 to 5 carbon atoms; and X represents a water-soluble group selected from the structures represented by the following formula (II), (III), (IV) or (V):
wherein R
a
, R
b
and R
c
, which may be the same or different, each independently represents a substituted or unsubstituted alkyl group having from 1 to 5 carbon atoms or a hydrogen atom; and A
−
represents a monovalent anion;
—SO
3
−
.B
+
(III)
wherein B
+
represents a monovalent cation;
&Parenopenst;O—L&Parenclosest;
n
O—R
d
(IV)
wherein L represents a substituted or unsubstituted alkylene group having from 2 to 4 carbon atoms; n represents an integer of from 2 to 8; and R
d
represents a hydrogen atom, a substituted or unsubstituted alkyl group having prom 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having from 6 to 10 carbon atoms;
wherein M represents a hydrogen atom or a metal atom; and R
2
, when X has the structure represented by formula (II), represents a substituted or unsubstituted alkyl group having the sum total of from 18 to 40 carbon atoms, a substituted or unsubstituted alkenyl group having the sum total of from 14 to 40 carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxyl group, —NR
3
R
4
which may be substituted (R
3
and R
4
each independently represents an alkyl group having from 1 to 40 carbon atoms, a hydrogen atom, or an aryl group), a substituted or unsubstituted bi
Mikoshiba Hisashi
Morigaki Masakazu
Sakurazawa Mamoru
Fuji Photo Film Co. , Ltd.
Killos Paul J.
Sughrue & Mion, PLLC
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