Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
1998-07-06
2002-12-17
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S448000, C430S546000, C430S558000
Reexamination Certificate
active
06495313
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide color photographic light-sensitive material. More particularly, the present invention relates to a silver halide color photographic light-sensitive material which is excellent in color forming property and rapid processing suitability and which provides color images having improved color reproducibility and image stability without severe degradation of images even when it is subjected to processing under such a condition that control of processing solutions is not necessarily satisfactory and a replenishment amount, pH, temperature or the like deviates from the proper range.
BACKGROUND OF THE INVENTION
It is well known that in a silver halide color photographic light-sensitive material an aromatic primary amine color developing agent oxidized with an exposed silver halide reacts with a coupler to form a dye such as an indophenol, an indoaniline, an indamine, an azomethine, a phenoxazine, a phenazine or a like dye, whereby a color image is formed. In this photographic system, a subtractive color process is ordinarily employed for color reproduction and color images are formed by yellow, magenta and cyan dyes.
Among them, in order to form cyan dye images, phenolic or naphtholic couplers are generally employed. However, these couplers have a problem in that color reproducibility is deteriorated since dyes formed therefrom have undesirable absorption in blue and green regions. Accordingly, it has been eagerly desired to solve such a problem.
In order to solve this problem, heterocyclic compounds have been proposed as described in U.S. Pat. Nos. 4,728,598 and 4,873,183 and EP-A-0249453. These couplers have, however, other fatal defects in that they have a low coupling activity and in that fastness of dyes formed therefrom are poor.
Pyrrolotriazole couplers have been proposed in U.S. Pat. No. 5,256,526 and European Patent 0545300 as couplers for solving the above-described problems. These couplers are excellent in hue and coupling activity. However, fastness of dye images formed therefrom is not always satisfactory and in particular, light fastness of color images in low density areas is poor in comparison with dye images formed from conventional couplers. Accordingly, improvement in the fastness of dye images has been expected. Further, it has been desired that whiteness in white background areas of the images be well maintained for a long period of time.
On the other hand, in the field of photographic processing, rapidity of processing and decrease in an amount of replenishment have been promoted in response to market needs. In order to conduct the rapid processing, it is important that a coupler used is highly active. For the purpose of developing such a highly active coupler, various investigations have been made, for example, to employ a straight chain alkyl group as a ballast group in the coupler, to introduce a dissociate group into the coupler or to lower a pKa of the coupler. However, these means for increasing the activity of coupler also cause undesirable increase in fog and stain. It is particularly important problem to be consistent the rise of activity with the restraint of fog and stain formed in the processing of low replenishment which imposes a large load on a photographic light-sensitive material.
Moreover, the control of processing solutions is not necessarily satisfactory in labs and so that the processing is carried out under circumstances wherein a replenishment amount, pH or the like deviates from the proper range. In such a case, color mixing due to processing gives rise to trouble as well as the increase in fog and stain described above. Thus, the finishing quality of color photographs is adversely affected by these problems in practice.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a silver halide color photographic light-sensitive material which contains a highly active coupler having improved color forming property and rapid processing suitability, and which provides color images with excellent color reproducibility and image stability and with less occurrence of fog and stain even when it is processed under such a condition that an amount of replenishment is decreased and control of the processing is not necessarily adequate.
Other objects and effects of the present invention will become apparent from the following description.
The above-described objects of the present invention have been achieved by providing a silver halide color photographic light-sensitive material comprising a support having provided thereon:
at least one yellow-color-forming light-sensitive silver halide emulsion layer;
at least one magenta-color-forming light-sensitive silver halide emulsion layer;
at least one cyan-color-forming light-sensitive silver halide emulsion layer; and
at least one light-insensitive non-color-forming hydrophilic colloid layer,
wherein at least one layer of said at least one cyan-color-forming light-sensitive silver halide emulsion layer contains at least one cyan-dye-forming coupler having a pKa of not more than 8.7, and
wherein said at least one light-insensitive non-color-forming hydrophilic colloid layer contains at least one compound represented by the following formula (I):
wherein R
1
, R
2
, R
3
and R
4
, which may be the same or different, each represents a hydrogen atom, an alkyl group or an aryl group; and R
5
represents an aryl group; provided that the total number of carbon atoms included in R
1
, R
2
, R
3
, R
4
and R
5
is not less than 14.
In a preferred embodiment, the compound represented by formula (I) is:
a compound represented by the following formula (II):
wherein R
a
and R
b
each represents an aryl group or an alkyl group; R
3
and R
4
each represents a hydrogen atom, an alkyl group or an aryl group; and R
5
represents an aryl group; or
a compound represented by the following formula (III):
wherein R
c
represents an alkyl group or an aryl group; R
3
and R
4
each represents a hydrogen atom, an alkyl group or an aryl group; and R
5
represents an aryl group.
In another preferred embodiment, the cyan-dye-forming coupler is represented by the following general formula (IV):
wherein Z
a
and Z
b
each represents —C(R
8
)═ or —N═, provided that one of Z
a
and Z
b
is —N═ and the other is —C(R
8
)═; R
6
and R
7
each represents an electron attractive group having a Hammett's substituent constant &sgr;
p
value of 0.20 or more and the sum of the &sgr;
p
values of R
6
and R
7
is 0.65 or more; R
8
represents a hydrogen atom or a substituent; X represents a hydrogen atom or a group capable of being released upon a coupling reaction with an oxidation product of an aromatic primary amine color developing agent; and group represented by R
6
, R
7
, R
8
or X may be a divalent group to form a dimer or more, or combine with a polymer chain to form a homopolymer or a copolymer.
In the silver halide color photographic light-sensitive material according to the present invention, the cyan-color-forming light-sensitive silver halide emulsion layer preferably further contains at least one compound represented by formula (I).
Furthermore, the compound represented by formula (I) contained in the cyan-color-forming light-sensitive silver halide emulsion layer is more preferably a compound represented by formula (III).
Moreover, it is preferred in the present invention that either or both of the yellow-color-forming light-sensitive silver halide emulsion layer and the magenta-color-forming light-sensitive silver halide emulsion layer further contains at least one compound represented by formula (I).
In the present invention, the groups represented by R
1
, R
2
, R
3
, R
4
and R
5
in formula (I) and the groups represented by R
a
, R
b
, R
c
, R
3
, R
4
and R
5
in formulae (II) and (III) mean and include not only unsubstituted groups but also substituted groups, respectively.
DETAILED DESCRIPTION OF THE INVENTION
Now, the Hammett's substituent constant &sgr;
p
value used in the present specific
Mikoshiba Hisashi
Morigaki Masakazu
Saito Naoki
Soejima Shin
Takahashi Osamu
Baxter Janet
Fuji Photo Film Co. , Ltd.
Walke Amanda C.
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