Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2003-06-26
2004-06-29
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S508000, C430S606000
Reexamination Certificate
active
06756190
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide color photographic light-sensitive material having improved workability and improved processing stability. Particularly, the present invention relates to a motion picture silver halide color photographic light-sensitive material.
BACKGROUND OF THE INVENTION
The motion picture, which is an application of silver halide photography, is a method of obtaining dynamic images by serially projecting densely-taken still pictures at a rate of 24 pictures per second, and it has a preponderantly high image quality as compared with other methods for reproducing dynamic images. However, recent rapid developments in electronic technologies and information processing technologies have come to propose a dynamic image reproduction means that gives an image quality close to that of a motion picture with a simpler process, such as a projector using a DMD device from Texas Instruments Incorporated or an ILA projector from Hughes-JVC. Therefore, also to the motion picture photographic material, it is desired to impart simplicity while maintaining its original high quality; in particular, simplification and reduction of time of operations in a processing laboratory, such as exposure and development, are demanded.
One of the factors that make handling of silver halide photographic light-sensitive materials difficult is that the materials before development processing must be handled in the dark. In the case of a silver halide photographic light-sensitive material for shooting that is required to have characteristics identical with those of human sight, it must be handled in the dark in principle. In contrast, in the case of a silver halide photographic light-sensitive material for prints that forms an image for appreciation based on information recorded in a silver halide photographic light-sensitive material for shooting, the material for prints does not always require to be handled in the dark. Many of silver halide photographic light-sensitive materials for prints actually put on the market have a decreased sensitivity in a specified wavelength range, thereby enabling operation under the light within the wavelength range (hereinafter referred to as “safelight”). For example, in the case of a motion picture silver halide photographic light-sensitive material (Fuji Color Positive Film F-CP (trade name), manufactured by Fuji Photo Film Co., Ltd., or the like), the sensitivity to light near a wavelength of 590 nm, which is between the sensitive wavelength of a green-sensitive emulsion layer and that of a red-sensitive emulsion layer, is lowered, therefore a light source that emits light near this specified wavelength (for example, low pressure sodium lamp) can be used as a safelight. However, a red-sensitive emulsion layer has sensitivity to the wavelength region though only slightly. Hence in the case where the brightness of the safelight is too high or where the material is exposed to the safelight for a long period of time, cyan fogging occurs due to exposure of the red-sensitive emulsion layer, giving an undesirable image. Therefore, from the viewpoint of operability, there has been demanded a material that hardly causes cyan fogging even when it is exposed to a brighter light source or to a safelight for a longer period of time, that is, a silver halide photographic light-sensitive material having a still lower sensitivity to light in the safelight wavelength range.
As a means for improving the operability in the dark (hereinafter referred to as “safelight safety (safelight immunity)”), it is conceived to introduce a colorant having absorption near the objective wavelength into a light-sensitive material. The colorant to be used for such a purpose is required to satisfy the following performances. That is, the following three points must be satisfied.
(1) The colorant has an appropriate spectral absorption according to purpose. That is, it has an absorption in the objective wavelength range but has no absorption in the wavelength regions that are normally required by a light-sensitive material (i.e. no reduction in sensitivity of the light-sensitive material).
(2) The colorant gives no adverse chemical influence to a silver halide emulsion layer in the light-sensitive material. For example, it gives no change in sensitivity, no fogging, and the like.
(3) In order not to leave harmful coloring on the photographic light-sensitive material, the colorant is fully decolorized or easily eluted from the photographic light-sensitive material during photographic processing procedures.
In particular, the issue of sensitivity of light-sensitive materials is important from the viewpoint of exposure operation in processing laboratories. Decreasing sensitivity of a light-sensitive material results in improvement in the safelight safety thereof. However, the decreased sensitivity means increase of the time necessary for exposure, with the result that the operability decreases. Therefore, a desired mode is to decrease only the sensitivity to safelight without decreasing the sensitivity to the wavelength regions that are normally required for light-sensitive materials.
An example of methods to introduce such colorant is a method that introduces a water-soluble dye into a light-sensitive emulsion layer or into a non-light-sensitive water-soluble colloid layer. Examples of the dye that can be used in such methods include oxonol dyes described in U.S. Pat. No. 4,078,933, and in addition, azo dyes, anthraquinone dyes, allylidene dyes, styryl dyes, triarylmethane dyes, merocyanine dyes, cyanine dyes, and the like.
As another introduction method, a method is known in which fine grains of colloidal silver are added in non-light-sensitive hydrophilic colloid layer(s) existing above and/or below a red-sensitive emulsion layer. On the other hand, JP-A-2002-169254 (“JP-A” means unexamined published Japanese patent application) proposes a method of adding a solid fine-particle dispersion of a dye that can be removed at the time of development processing to non-light-sensitive hydrophilic colloid layer(s) existing above and/or below a red-sensitive emulsion layer. In particular, a method using a solid fine-particle dispersion of a dye that can be removed at the time of processing, can control the hue of a colored layer, and can achieve a balance between reduction in sensitivity in the safelight wavelength region and maintenance of sensitivity in the wavelength region required for exposure. In addition, the method is an excellent method that is applicable to a motion picture positive film, which film uses silver generated by development processing to form a sound track.
On the other hand, among the studies conducted from the viewpoint of simplification of handling, a typical example of the studies performed from a viewpoint other than the above-mentioned safelight safety is a study on simplification and speeding up of development processing. As approaches to the speeding up of development processing from light-sensitive materials, there have been proposed various methods and major approaches can be summarized into the following two:
1) To increase developing speed, and
2) To speed up removal of unnecessary components.
Typical study examples of the former include development of a high silver chloride emulsion and use of highly activated couplers, and in the latter, typical study examples include improvement in bleaching/fixing speed and development of dyes that are easily decolorized.
However, in the case where a necessary amount of a water-soluble dye or a solid fine-particle dispersion of a dye is added for the above-mentioned safelight safety, a decrease in elution speed of the dye at the time of photographic processing is inevitable; and, it has been difficult to achieve improvement of safelight safety and reduction in coloring in white background compatibly. Therefore, development of a method for improving safelight safety that is highly efficient even with a smaller amount of a dye has been demanded.
SUMMARY OF THE INVENTION
The present invention is
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Schilling Richard L.
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