Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
1998-11-03
2001-10-30
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S631000, C430S377000, C430S449000
Reexamination Certificate
active
06309812
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a photographic technique, and particularly to an emulsified dispersion of photographic hydrophobic compound fine particles, wherein, by adding a water-soluble metal salt, particle size atomization and particle size stabilization after the passage of time have been attained; the invention also relates to a method of preparing the emulsified dispersion, and to a silver halide photographic light-sensitive material containing that emulsified dispersion.
BACKGROUND OF THE INVENTION
It is known that, when a silver halide color photographic light-sensitive material is exposed to light and then subjected to color-development, an oxidized aromatic primary amine developing agent and a coupler are reacted, to produce indophenols, indoanilines, indamines, azomethines, phenoxazines, phenazines, and similar dyes, to form a color image. In this system, for the color reproduction, generally the subtractive color process is employed, and use is made of silver halide emulsions selectively photosensitive to blue, green, and red, and yellow, magenta, and cyan color couplers in color relation complementary to them, respectively.
In the meantime, in a multilayer color light-sensitive material, in order to reduce the color mixing and to improve the color reproduction, it is required to fix couplers in separate layers. To make these couplers nondiffusible, many methods are known.
Representative examples of these methods include the introduction of a long-chain aliphatic group into the molecule of a low-molecular coupler, in order to prevent the diffusion; and the polymerization as described in U.S. Pat. No. 4,080,211.
Since such couplers themselves are immiscible with aqueous binder (particularly gelatin) solutions, they are generally used in the form of a dispersion.
Thus, as an example of a method for making a water-insoluble coupler into an aqueous dispersion, a method as described in U.S. Pat. No. 2,322,027 can be mentioned, wherein a coupler is dissolved in a high-boiling organic solvent, and the resultant solution is emulsified and dispersed into an aqueous gelatin solution.
However, in the emulsified dispersion of the thus-obtained hydrophobic compound fine particles, there is a problem that the particle size is large or becomes large as a result of coalescence/aggregation or the like with lapse of time, leading to a decrease in color density and an occurrence of application (surface state) trouble.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an emulsified dispersion whose particle size is small and the stability of the particle size after the lapse of time (the stability of the dispersed particle size with lapse of time when the medium is in the state of sol) is excellent.
Another object of the present invention is to provide a silver halide photographic light-sensitive material containing this emulsified dispersion.
Other and further objects, features, and advantages of the invention will appear more fully from the following description, taken in connection with the accompanying drawings.
REFERENCES:
patent: 2322027 (1943-06-01), Jelley et al.
patent: 3623877 (1971-11-01), Langley
patent: 4080211 (1978-03-01), Van Paesschen et al.
patent: 5380628 (1995-01-01), Sawyer et al.
patent: 0683429A1 (1995-11-01), None
patent: 0895119A1 (1999-02-01), None
patent: 1193349 (1970-05-01), None
Chemical Abstracts, vol. 90, No. 20, May 14, 1979 XP00209'6308.
Aogaki Yukio
Fukuoka Masahiro
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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