Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Reexamination Certificate
2002-02-25
2003-07-08
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
C430S523000, C430S539000, C430S603000, C430S605000, C430S634000
Reexamination Certificate
active
06589723
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a new fluorocompound and surfactant to which can be imparted surface functions such as water repellency, oil repellency, grime resistance, and electrostatic resistance, and a water-based coating material and silver halide photographic light-sensitive material employing the same.
RELATED ART
Compounds having fluoroalkyl chains are known as surfactants. Various surface property modifications can be conducted based on the unique properties (water repellency, oil repellency, lubricating property, electrostatic resistance, and the like) of fluoroalkyl chains, and they are widely employed in the surface processing of base materials such as fiber, cloth, carpet, and resins. Furthermore, not only can uniform films be formed without repelled spots during film formation when surfactants comprising fluoroalkyl chains (referred to hereinafter as fluorosurfactants) are added to aqueous medium solutions of various matrixes, but an adsorption layer of the surfactant can be formed on the matrix surface, imparting the above-mentioned unique properties of fluoroalkyl chains to the film surface.
Various surfactants are employed in photographic light-sensitive materials, performing important roles. Photographic light-sensitive materials are usually manufactured by applying multiple coating solutions comprising aqueous solutions of a hydrophilic colloidal binder (such as gelatin) on a support member to form multiple layers. Often, multiple hydrophilic colloidal layers are simultaneously applied in multiple layers. These layers include antistatic layers, undercoating layers, antihalation layers, silver halide layers, intermediate layers, filter layers, and protective layers. Various substances are added to individual layers to impart specific functions. Furthermore, polymer latex is sometimes incorporated into hydrophilic colloidal layers to improve the physical properties of the films. To incorporate highly water-insoluble functional groups such as color couplers, ultraviolet absorbing agents, fluorescent whitening agents, and lubricants into hydrophilic colloidal layers, these substances are sometimes dispersed and emulsified as is in hydrophilic colloidal solutions or as solutions of high-boiling-point organic solvents such as phosphoric ester compounds and phthalic ester compounds, and employed in the preparation of coating solutions. Generally, in this manner, photographic light-sensitive materials are comprised of various hydrophilic colloidal layers, and in the course of manufacturing, coating solutions comprising various substances are required to permit uniform high-speed coating without the drawbacks of repelled spots and coating irregularity. To fulfill such demands, surfactants are often added to coating solutions as adjuvants.
Additionally, photographic light-sensitive materials come into contact with a variety of substances during manufacturing, photographing, and developing. For example, during processing, when the light-sensitive material is wound up, the backing layer formed on the back surface of the support sometimes comes into contact with the front surface. Furthermore, in the course of conveying during processing, there is sometimes contact with stainless steel and rubber rollers. Upon contact with such materials, the surface of the light-sensitive material (gelatin layer) tends to develop a positive charge, sometimes causing unwanted discharge leaving behind undesirable exposure traces (known as static marks) on the light-sensitive material. Compounds comprising fluorine atoms are effective at reducing the electrostatic property of the gelatin, and fluorine surfactants are often added.
Thus, surfactants, particularly fluorine surfactants, are employed as materials functioning both as coating adjuvants imparting uniform properties to the coating film and as antistatic agents in the photographic light-sensitive material. Specific examples are disclosed in JP-A-49-46733, JP-A-51-32322, JP-A-57-654228, JP-A-64-536, JP-A-2-141739, JP-A-3-95550, and JP-A-4-248543 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”). However, these materials do not necessarily afford satisfactory performance as regards demands for high sensitivity and high-speed coating in photographic light-sensitive materials of recent years, and further improvement in fluorine surfactants is needed. Generally, short perfluoroalkyl chains are considered advantageous from the viewpoint of decomposition (the decomposition of the compound following use), but the orientation of the fluoroalkyl chain in the coating surface decreases markedly. Accordingly, there is a strong need for the development of a fluorosurfactant with a relatively short fluoroalkyl chain affording both surface orientation (related to the electrostatic property) and coating uniformity.
The present invention has as its object to provide a new fluorocompound and a surfactant comprising the same that permit uniform film formation when employed during film formation while having short perfluoroalkyl groups. A further object of the present invention is to provide an aqueous coating composition capable of forming uniform films having antistatic properties. A still further object of the present invention is to provide a silver halide light-sensitive material imparted with antistatic properties while permitting stable production.
SUMMARY OF THE INVENTION
The foregoing objects are accomplished by the invention to provide a fluorocompound denoted by general formula (1) below.
(wherein R
1
denotes a substituted or unsubstituted alkyl group having a total of at least six carbon atoms, with R
1
not being an alkyl group substituted with a fluorine atom; R
f
denotes a perfluoroalkyl group having not more than six carbon atoms; either X
1
or X
2
denotes a hydrogen atom and the other denotes SO
3
M; M denotes a cation; and n denotes an integer of not less than 1).
In the formula (1), R
1
preferably denotes a substituted or unsubstituted alkyl group with a total of 6-24 carbon atoms, more preferably, a substituted or unsubstituted alkyl group with a total of 6-18 carbon atoms, and further preferably, an unsubstituted alkyl group with a total of 8-10 carbon atoms.
In the formula (1), n preferably denotes an integer of 1-4, more preferably, 1 or 2.
In the formula (1), it is preferably that when n=1, R
f
denotes a heptafluoro-n-propyl group or nonafluoro-n-butyl group, and when n=2, R
f
denotes a nonafluoro-n-butyl group.
In the formula (1), M preferably denotes an alkali metal ion, alkali earth metal ion or ammonium ion.
This invention further provides a silver halide photographic light-sensitive material having at least one layer comprising a light-sensitive silver halide emulsion layer on a support and comprising a compound denoted by general formula (1) below in at least one layer thereof
(wherein R
1
denotes a substituted or unsubstituted alkyl group having a total of at least six carbon atoms, with R
1
not being an alkyl group substituted with a fluorine atom; R
f
denotes a perfluoroalkyl group having not more than six carbon atoms; either X
1
or X
2
denotes a hydrogen atom and the other denotes SO
3
M; M denotes a cation; and n denotes an integer of not less than 1).
In a preferred embodiment of the present invention, there is a light-insensitive hydrophilic colloidal layer in the outermost layer and said outermost layer comprises the compound denoted by said general formula (1).
In a preferred embodiment of the present invention, at least one of the silver halide emulsions comprised in said silver halide emulsion layers is an emulsion in which not less than 50 percent of the total projection area of the silver halide grains is made up of grains with an aspect ratio of not less than 3, in a more preferred, not less than 8.
In a preferred embodiment of the present invention, at least one of the silver halide comprised in said silver halide emulsion layers is iodobromide, iodochloride, bromochloride or iodochlorobromide.
In a preferred embodiment
Hamamoto Nobuo
Yamanouchi Junichi
Yanagi Terukazu
Yasuda Tomokazu
Birch & Stewart Kolasch & Birch, LLP
Fuji Film Co., Ltd.
Schilling Richard L.
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