Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2001-03-12
2003-02-11
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...
C430S505000, C430S517000, C430S522000, C430S556000, C430S557000
Reexamination Certificate
active
06518006
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silver halide color photographic photosensitive material having improved color reproducibility and processing stability and more particularly relates to a silver halide color photographic photosensitive material that has these properties and is used for cinema.
2. Description of the Related Art
There is always a need for raising the image quality of a silver halide color photographic photosensitive material that is used for viewing, recording, and preserving images, and therefore much research has been carried out. Examples of the method of raising the image quality of a silver halide color photographic photosensitive material include the following methods.
(1) Enhancement of image sharpness by such means as the use of an irradiation-preventing dye, reduction of the thickness of a hydrophilic colloid layer coated on a support, and formation of a colored layer for the prevention of halation;
(2) Improvement of granularity by the reduction of the sizes of photosensitive silver halide particles or by controlling the shape of dye clouds to be formed;
(3) Enhancement of color reproducibility by the employment of a dye-forming coupler capable of providing excellent spectral absorption characteristics of the coloring dye to be obtained;
(4) Prevention of unnecessary coloration in processed photosensitive materials by a design in which coloring materials such as dyes, sensitizing dyes, and the like are easily decolorized in processing; and
(5) Prevention of discoloration and fading by such means as the use of a dye-forming coupler providing a coloring dye having excellent colorfastness and the use of a compound capable of raising the colorfastness of the dye.
Among the properties described above, image sharpness, together with granularity, are important properties in a silver halide color photographic photosensitive material, which may be enlarged when it is viewed or when it is transferred to a material for viewing, or in a silver halide color photographic photosensitive material which needs to be enlarged in order to be viewed, such as a print material for cinema. Further, in images containing character information and illustrations such as those seen in images for use in commercials, the image sharpness of the material displaying such character information and illustrations determines the impression of the entire images. Accordingly, the enhancement of image sharpness is very important to the enhancement of image qualities.
As stated above, the prevention of halation and irradiation is effective as a means of enhancing the image sharpness. As a means of preventing halation and irradiation, the coloring of the hydrophilic colloid layer with a water-soluble dye has been employed. Examples of such dyes include oxonol dyes described in U.S. Pat. No. 4,078,933 and other dyes such as azo dyes, anthraquinone dyes, allylidene dyes, styryl dyes, triarylmethane dyes, merocyanine dyes, and cyanine dyes. When these dyes are coated on a photosensitive material, these dyes are diffused into the entire layer of the photosensitive material, and therefore these dyes are effective in the prevention of irradiation. However, for the prevention of halation, by taking into account the amount of the dye that will be diffused into other layers, a large amount of the dye needs to be added. Such a large amount of the dye will easily bring about photographic problems such as the sensitivity reduction due to the absorption of the dye thus added and the increase of the coloring of the white background due to the residual color of the dye. Accordingly, the formation of a non-diffusive colored layer is necessary for the effective prevention of halation.
Examples hitherto known as the methods of forming a non-diffusive colored layer are a method in which colloidal silver is incorporated in a specific non-photosensitive hydrophilic colloid layer and a method in which a support having a hydrophilic resin layer having fine carbon black particles dispersed therein is used. However, in principle the former cannot be used in a system in which information is recorded by means of the silver formed by development (e.g., a black-and-white photographic photosensitive material or a print material for cinema having sound tracks). On the other hand, the latter needs the removal of the colored layer at the time of image formation and thus increases the number of the steps required for the development processing. This presents a problem that the latter method contradicts the current trend of the simplification of the development processing.
As other methods free from the problems described above, there have been proposed a method in which the hydrophilic colloid layer is selectively colored by use of a polymeric mordant and a method in which a dispersion of solid particles of a dye is used.
However, these methods were also associated with a problem that, when a dye in an amount necessary for the enhancement of image sharpness was added, the reduction in the leaching rate of the dye at the time of development could not be avoided. Therefore, it was difficult to achieve the two properties of images, i.e., image sharpness and prevention of the coloring of the white background, at the same time. Because of this, there has been a search for a dye, which tends to remain in as a dispersion of solid particles in a hydrophilic colloid layer and tends to be easily leached out or decolorized at the time of processing. In this regard, dyes such as those described in Japanese Patent Application Laid-Open (JP-A) No. 2-282244 have been proposed.
On the other hand, the improvement of color reproducibility is also an effective means of raising the image quality of a silver halide color photographic photosensitive material. In a silver halide color photographic photosensitive material, it is well known that a color developing agent based on aromatic primary amine, being oxidized by the silver halide exposed to light and thereafter acting as an oxidizing agent, reacts with a coupler to thereby produce a dye such as indophenol, indoaniline, indamine, azomethine, phenoxazine, or phenazine, and an image is formed. In this photographic process, a subtractive process is employed and color images are formed by yellow, magenta, and cyan dyes. Also in this field, continuous efforts have been made to develop a coupler capable of forming a dye having a higher chromatic level in order to raise the color reproducibility.
Among these couplers, a pivaloylacetanilide-type coupler or a benzoylacetanilide-type coupler has been mostly used for the formation of yellow images. The former provides a dye having a desirable absorption as a yellow dye, but a large amount of the coupler is required in order to obtain a necessary density because the molecular absorption coefficient of the coloring dye is low. The latter provides a dye having a fairly long spectral absorption wavelength as a yellow dye and therefore the latter is inferior to the former in terms of color reproducibility, although the necessary density can be achieved with a relatively small amount of the latter coupler because the molecular absorption coefficient of the dye obtained is high. Therefore a need exists for putting a coupler, which has the advantages of these two couplers, to practical use.
Meanwhile, from a viewpoint other than that of raising image qualities, research for simplifying the handling have also been conducted. Typical of this research is research for the simplification of the development processing. As to the speeding up of the development processing, although various methods have been proposed which approach this from the photosensitive material side, the main research can be summarized into the following two:
(
1
) Speeding up the development
(
2
) Speeding up the removal of unnecessary components.
Typical examples of the former is the development of a silver halide emulsion having a higher proportion of silver chloride and the development of a coupler having a higher activity. Regarding the
Sakai Hidekazu
Shimada Yasuhiro
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