Silver halide color reversal lightsensitive material

Details Silver halide color reversal lightsensitive material Silver halide color reversal lightsensitive material

2000-10-20

2002-04-23

Le, Hoa Van (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

C430S559000, C430S569000, C430S596000

Reexamination Certificate

active

06376164

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a silver halide color reversal lightsensitive material. More particularly, the present invention is to provide a silver halide color reversal lightsensitive material having a push-processability favorable to users and relates to a silver halide color reversal lightsensitive material which is improved in sensitivity at high speed development, gradation, gradation balance and color balance.
In the color reversal image formation, a sensitivity regulation by prolonging the black and white development time during color reversal process is conducted in order to compensate for any under-exposure of a color photographic lightsensitive material. This sensitivity regulation is generally called “push-processing”.
Various trials for enhancing the push-processability have been made. For example, the method of enhancing the push-processability with the use of a color reversal lightsensitive material in which a silver halide emulsion having fog nuclei inside silver halide grains is employed, is disclosed in Jpn. Pat. Appln. KOKAI Publication No. (hereinafter referred to as JP-A-) 59-214852, JP-A's-60-170849, 60-170850, 60-170851, 60-170852, 60-170853, 63-193147 and 9-218485. Further, the method of enhancing the push-processability with the use of a color reversal lightsensitive material having colloidal silver contained in an interlayer combined with a silver halide emulsion layer, is disclosed in U.S. Pat. No. 5,298,369 (JP-A-5-257243).
However, although the method of improving, for example, the sensitivity, highest density and color balance in the push-processing of a color reversal lightsensitive material is disclosed in the above literature, these techniques cannot be stated as being satisfactory with respect to the improvement of gradation and gradation balance when push-processing is performed.
Moreover, JP-A-7-225459 discloses the technique of improving the gradation balance and gradation change at push-processing by the use of a DIR compound, colloidal silver and an emulsion of internal latent image type. This push-processing is intended to attain a speed increase to about twofold, or pays attention to the gradation, color balance and gradation balance at a push-processing for attaining a speed increase to fourfold or more, or is intended to effect a sensitization with a speed of twofold (0.3 log E or less). However, the push-processing practically employed by most users ranges from 1.4-fold to less than fourfold in speed, and it has not yet been elucidated what kind of characteristic values must be possessed by a color reversal film capable of producing like images irrespective of any speed set within this range in the use thereof or how these can be attained.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a color reversal lightsensitive material improved especially in the gradation, gradation balance and color balance at push-processing.
DETAILED DESCRIPTION OF THE INVENTION
The inventors have conducted extensive and intensive studies and, as a result, the above object of the present invention has been attained by the following:
(1) A silver halide color reversal lightsensitive material comprising a transparent support and, superimposed thereon, a blue-sensitive emulsion layer unit, a green-sensitive emulsion layer unit and a red-sensitive emulsion layer unit, each of these units comprising at least two emulsion sub-layers having the same color sensitivity but different speeds from each other, wherein said material contains a yellow dye in an amount of 0.15 to 1.0 g/m
2
and satisfies the relationship:
0.9≦&ggr;′/&ggr;≦1.25
wherein &ggr; and &ggr;′ each represent a point-gamma value of a portion of said material giving a magenta density of 1.0 when said material was subjected to a development processing comprising an image-wise exposure step, a black and white development step, a reversal processing step, a color development step and a desilvering step thereby forming color reversal images, provided that &ggr; is the point-gamma value attained when a period of the black and white development step was set to a standard period, and &ggr;′ is the point-gamma value attained when the period of the black and white development step was prolonged to attain a higher speed of 0.5 log E;
(2) The material as recited in item (1) above, wherein said material comprises means for releasing a development inhibitor during the development processing;
(3) The material as recited in item (2) above, wherein said means for releasing a development inhibitor is a DIR compound represented by the general formula (I):
A—(L)
n
—(G)
m
-(Time)
t
—X  (I)
wherein A represents a redox mother nucleus or a precursor thereof and represents a group oxidized during the development processing to thereby enable, for the first time, splitting off -(Time)
t
-X, Time represents a group that can release X after -(Time)
t
-X is released, X represents a development inhibitor, L represents a divalent linkage group, G represents an acid group, and each of n, m and t is 0 or 1, provided that m is not 0 when n =1;
(4) The material as recited in any of items (1) to (3) above, wherein 1×10
−4
to 5×10
−3
g/m
2
of at least one compound selected from the group consisting of compounds represented by the general formula (II) given below and compounds that selectively adsorb onto (100) faces of each silver halide grain, is contained in at least one sub-layer having the lowest speed,
wherein X represents hydrogen or an alkali metal atom, R represents hydrogen, a halogen or an alkyl group having 1 to 5 carbon atoms, and n represents an integer from 1 to 4;
(5) The material as recited in any of items (1) to (4) above, wherein colloidal silver is further contained in at least one layer selected from the group consisting of a sub-layer having the lowest speed and a nonlightsensitive layer next to the sub-layer having the lowest speed; or
(6) A silver halide color reversal lightsensitive material comprising a transparent support and, superimposed thereon, a blue-sensitive emulsion layer unit, a green-sensitive emulsion layer unit and a red-sensitive emulsion layer unit, each of these units comprising at least two emulsion sub-layers having the same color sensitivity but different speeds from each other, wherein said material contains a yellow dye in an amount of 0.15 to 1.0 g/m
2
and contains 1×10
−4
to 5×10
−3
g/m
2
of at least one compound selected from the group consisting of compounds represented by the general formula (II) given below and compounds that selectively adsorb onto (100) faces of silver halide grains, in at least one sub-layer having the lowest speed,
wherein X represents hydrogen or an alkali metal atom, R represents hydrogen, a halogen or an alkyl group having 1 to 5 carbon atoms, and n represents an integer from 1 to 4.
In the present invention, the point-gamma value is determined from a characteristic curve. The terminology “characteristic curve” used herein means a D−log E curve obtained by plotting D (color density) of the axis of ordinate against log E (E: exposure amount) of the axis of abscissa, which is described in detail in, for example, pages 501 to 509 of “The Theory of the Photographic Process” 4-th edition, edited by T. H. James, the disclosure of which is herein incorporated by reference.
The characteristic curve referred to in the present invention is determined in accordance with the following test method.
(1) Test Conditions
The test is performed in a perfect darkroom of 23±5° C. temperature and 50±20% relative humidity. Lightsensitive materials to be tested are allowed to stand still in this state for at least one hour before use.
(2) Exposure Conditions
The lightsensitive materials to be tested are exposed under the conditions specified in the international standard: ISO 2240 “Photography—Color reversal camera films—Determination of ISO speed”.
(3) Processing Conditions
During the period from

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