Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2002-05-22
2003-11-18
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
active
06649333
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silver halide color photographic photosensitive material (hereinafter sometimes simply referred to as a “photosensitive material”), and more particularly, it relates to a silver halide color photographic photosensitive material that is excellent in whiteness degree and is excellent in production stability, performance stability with respect to long-term storage in an unexposed state, and performance stability with respect to fluctuation of processing conditions of the photosensitive material. It further relates to a silver halide color photographic photosensitive material that can provide a preferred whiteness degree in highlight portions immediately after developing process and can maintain a preferred whiteness degree in highlight portions after storing under a high humidity condition, and also relates to a silver halide photographic photosensitive material that is improved in white background and color resolving power of a colored cyan dye, has an enhanced color reproduction range, and is excellent in faithful reproduction property. The invention also relates to a process for forming a color image using the silver halide color photographic photosensitive material.
2. Description of the Related Art
Silver halide color photographic photosensitive materials have been widely used as materials for stably providing a high quality image at low cost, but the users' demands for high image quality, qualitative stability and high productivity are being increased. As for the demand for high image quality, improvements in whiteness, color reproducibility and sharpness are required, and as for the demand for qualitative stability, improvements in production stability, stability in long-term storage in an unexposed state and stability in performance on developing process are required for the photosensitive materials. With respect to the improvement in productivity, increase in processing rate is demanded.
White background is important in photographic photosensitive materials for direct viewing, such as color paper. In an image having white background in a large proportion, there are cases where impression of an image is largely changed by changing a light source for viewing the image, and therefore, such white background is demanded that is stable against the light source. As one measure for improving quality of white background, unnecessary coloration is decreased as far as possible, and for example, reduction of fogging of a silver halide emulsion, reduction of remaining coloration of a sensitizing dye and an irradiation preventing dye, and prevention of attachment of contamination of a processing solution to the photosensitive material are exemplified. Another measure for improving the quality of white background is that the color is adjusted with a coloring matter having a complementary color with respect to the unnecessary coloration.
As one measure for reducing the unnecessary coloration, an amount of a binder in a hydrophilic colloid layer constituting the photosensitive material is decreased to reduce adsorption of remaining coloration of a sensitizing dye and an irradiation preventing dye and contamination of a processing solution. When the amount of the binder, such as gelatin, is decreased, such an adverse effect occurs that the strength of the film is reduced. The adverse effect can be avoided by decreasing an amount of a lipophilic photographically useful component (hereinafter referred to as an oil soluble component) in the photographic constitutional layers. As a method for decreasing the oil soluble component, for example, the amount of a high boiling point organic solvent used as a solvent of, for example, a dye-forming coupler is decreased. However, the reduction of the coupler solvent causes such a problem that the coloring property is lowered, and image fastness of the formed dye is deteriorated. Therefore, an alternative technique is being demanded.
As another measure for improving quality of white background, there is such a method that the color is adjusted with a coloring matter having a complementary color with respect to the unnecessary coloration. For example, it has been known that in the case where so-called resin coated paper, which is obtained by coating a paper support with a water resistant resin containing a white pigment, is used, a blueish pigment, such as an ultramarine blue pigment, is added to the water resistant resin layer. However, this method has such disadvantages that the necessary amount for adjusting the color is too large, and the brittleness of the support is deteriorated, and therefore, an alternative technique is being demanded.
Color print photographic materials have been widely used as a method for forming an image that can easily provide a color image at low cost. It is natural that a color print having good image quality is desired, and four items of characteristics, i.e., an image density, gradation, color balance and whiteness in highlight portions, are considered as characteristics that largely influence the quality of the color print material.
As a method for adjusting the whiteness of highlight portions among the characteristics, a method of adjusting whiteness of a support, and the method of adjusting whiteness of a hydrophilic colloid layer constituting a photographic constitutional layer are generally employed. For example, examples of the method for improving the whiteness include a method, in which a white pigment or a fluorescent whitening agent is added to the support or the hydrophilic colloid layer to improve the whiteness, and a method, in which blue tone is applied to antagonize yellow stain to avoid yellow stain, whereby a neutral color is obtained to make whiteness that can be viewed by human eyes.
However, the whiteness of highlight portions is fluctuated by the nature of the other photographic constitutional elements and the method of processing.
In recent years, photographic photosensitive materials of high image quality that can be quickly processed is demanded as a part of improvements of service for users and a measure for improving productivity. In order to deal with the demand, such a quick process is generally practiced that a photographic photosensitive material containing a high silver chloride emulsion (hereinafter sometimes referred to as a “high silver chloride print material”) is processed for a coloration development time of 45 seconds, whereby the total process from the start of the developing step to the completion of the drying step is carried out within about 4 minutes (for example, COLOR PROCESS CP-45X produced by Fuji Photo Film Co., Ltd.). The quickness of the quick developing process of the high silver chloride print material cannot be satisfactory in comparison to the quickness of image production of other color image production methods (such as an electrostatic transfer method, a thermal transfer method and an ink jet recording method), and a super quick process is demanded that provides such a level that the total process time from the start of developing step of the high silver chloride color print material to the completion of the drying step is less than one minute.
Various studies and attempts for measures for improving the applicability to the super quick process have been made in this field of art to realize the demand. For example, as measures for improving the applicability to the super quick process, it has been investigated that (1) a high activity coupler and a coupler having a coloring dye having a large molecular extinction coefficient are employed to reduce the coated amount of organic materials, and a coated amount of a hydrophilic binder is reduced, and (2) a silver halide emulsion exhibiting a high developing rate is employed. Furthermore, it has been known that a silver halide emulsion layer having the lowest developing rate (corresponding to a layer containing a yellow coupler in a conventional color print material) is coated at a position that is farthest from the support to im
Makuta Toshiyuki
Soejima Shin
Yoneyama Hiroyuki
Fuji Photo Film Co. , Ltd.
Le Hoa Van
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