CA1047820A - Photographic elements containing iodoso compounds or iodoxy compounds - Google Patents

Abstract

PHOTOGRAPHIC ELEMENTS CONTAINING
IODOSO COMPOUNDS OR IODOXY COMPOUNDS

Abstract of the Disclosure Iodoso compounds and iodoxy compounds are useful as oxidants in photographic elements or film units.

Description

This invention relates to the art o~ photography and particularly to photographic elements, such as color diffusion transfer elements, employing oxidizing agents.
Color diffusion transfer processes generally involve the use of a photographic element comprising a support, at least one silver halide emulsion, and an image dye-providing material which is contained in or contiguous said layer. After exposure, such a photographic element is treated with an alkaline process-ing solution to erfect imagewise discrimination in the element.
As is well-known in the art, the dye-providing material can be initially immobile or initially mobile in the processing solu-tion. Upon alkaline processing of an initially immobile dye-providing material, a mobile dye or dye precursor can be released imagewise or the material can be imagewise rendered mobile. If the material is initially mobile, the processing solution typically renders the material insoluble (and thus immobile) in an imagewise fashion. Whether initially mobile or immobile, upon treatment with a processing solution the dye-providing material typically is oxidized under alkaline condi-tions, thereby producing imagewise discrimination in the ele-ment.
~ xemplary color diffusion transfer processes are those using developing agents as disclosed in U.S. Patents 2,698,798 and 2,559,643 wherein a latent silver halide image is developed with a color-developing agent. As development proceeds, the color-developing agent reduces the exposed silver halide to metallic silver and the color-developing agent which is oxidized as a function of development forms an immobile species while the unoxidized color-developing agent is free to migrate to a receiving element. After migration, the color-developing agent in the receiver is oxidized. The oxidized developing agent then ~'

-2- ~

782(~
self-couples or couples ~;~ith a co]or coupler to form a positive dye image.
A more rccent example of' a photographic process in ~hich oxidation causes formation of an image dye is described by I,cstlna and L3ush in l~elgian J'atent 792,59~, entitled "l'hoto-graphic ~lements Containin~ Oxichromic Compounds". Those oxi-chromic compounds are ones which undergo chromogenic oxidation to form a ne~ chromophore. Useful materials of that type are oxichromic compounds which contain a developing moiety and an oxichromic moiety and have the general formula D-(OC), wherein D- is a group wllich is a silver halide developer such as a hydroquinone moiety and (OC) is a moiety which undergoes chromo-genic oxidation to form an image dye. These oxichromic com-pounds are particular]y useful in an image-transfer unit format in which the respective initially diffusible oxichromic com-pounds or the initially nondiffusible compounds are used in com-bination with the appropriate silver halide emulsions.
In order to achieve optimum results when using such oxichromic compounds, it is desirable to have an oxidant which has no substantial absorption in the visible spectrum (i.e., colorless) and which can be easily incorporated in a photo-graphic element with good stabillty. The oxidative conversion of oxichromic compounds or of other color-providing materials is necessary in order to achieve color image formation. Accord-ingly, there is a continuing need in the art for materials which exhibit suitable oxidation capability.
I have found a class of oxidants well-suited for use in color diffusion transfer color elements and in any other pho-tographic element in which an oxidant is a necessary or desira-~le in~redient. I~hen used in photographic elements containing :: \

10478Z0 ..
certain oxichromic compounds, the oxidant readily oxidizes theoxichromic moiety.
Generally, the photographic elements of this invention comprise a support and at least one layer thereon containing an iodoso compound or an iodoxy compound of the formula R-Q wherein Q is an iodoso group which contains an iodine atom and an oxygen atom or Q is an iodoxy group including iodoxy derivatives, i.e., such as iodoxy diacetates, and R is a carbocyclic or heterocy-clic group containing from 5 - 7 atoms i~ the cyclic moiety and wherein the iodine atom of Q is covalently bonded to a car-bon atom in said cyclic group. Preferabl~, R comprises an aro-matic group covalently bonded through a carbon atom to the iodine atom in Q. These iodoso and iodoxy compounds can be incorporated in photographic elements as oxidants with reduced danger of explosion which is associated with closely related compounds such as periodates, and with better control of where oxidation occurs during processing.
In one highly preferred embodiment, the photographic elements of this invention contain iodoso compounds of the for-20 mula:

I=0 ,'C`c_x ~Z~ ' , -wherein X is a carboxylic acid group, a sulfonic- acid group and the like, and Z represents a group containing the atoms neces-sary to form a 5- to 7-membered ring with the remainder of said atoms of said formula.
In another highly preferred embodiment, the photo-graphic elements of this invention contain iodoxy compounds hav-ing the formula:

_~ . ...

~47820 cv.
~ , .

wherein Q represents an iodoxy group which can be the group -I-02 or is preferably an iodoxy derivative, for example, an iodoxy diacetate such as an iodoxy ethyl diacetate, an iodoxy propyl diacetate, an iodoxy methyl diacetate, an iodoxy maleate and the like, and Z represents a group containing the atoms nec-essary to form a 5- to 7-membered carbocyclic or heterocyclic ring with the carbon atom as shown in the formula.
In one highly preferred embodiment of this invention, the iodoso compound or iodoxy compound contain a group thereon which is sufficiently large to render the compound substantially nondiffusible in the photographic element. Typically, ballast groups which are useful are aliphatic groups containing at least 8 carbon atoms.
The iodoso compounds and iodoxy compounds which give particularly good results in the practice of this invention can be characterized in terms of their polarographic halfwave poten-tials, i.e., their oxidation or reduction potentials as deter-mined by polarography. Cathodic measurements of the reduction potential can be made with-a solution of the iodoso compound or iodoxy compound, typically in a basic solvent such as potassium hydroxide, using a dropping mercury electrode with the polaro-graphic halfwave potential for the most positive wave being des-ignated Ec. In each measurement, the reference electrode is a standard calomel electrode. Electrochemical measurements of this type are known in the art and are described in New Instru-mental Methods in Electrochemistry, by Delahay, Interscience Publishers, New York, New York, 1954; Polarography, by Kolthoff and Lingane, 2nd Ed., Interscience Publishers, New York, New York, 1952; Analytical Chemistry, 36, 2426 (1964) by Elving, and ~)47820 Analytical Chemistry, 30, 1576 (1958) by Adams. Plus amd minus signs are according to IUPAC (International Union of Pure and Applied Chemistry), Stockholm Convention, 1953. Useful com-pounds should have a polarographic reduction potential which is more positive than the polarographic oxidation potential o~ the ingredients to be oxidized. In general, useful compounds inelude those having a polarographic reduction potential more positive than about -0.5 v. Typical iodoso compounds or iodoxy ~ompounds for use in oxiehromie proeesses, as described by Lestina and Bush in Belgian patent 792,598 mentioned above, are those having a reduetion potential, Ec, between about -O.l and -0.5 Y.
Typieal useful iodoso eompounds are as follows:

Compound I ~ ¦

I=O OH
~o~e- ~l 7 ~J - COO ~ ~ic, I=O O
Compound 3 C15H31 ~ ~ C-OH

I(OCCH3)2 .

Compound 4 1 ,, _ NHCCHO ~ \\
C H \~

I(OCC81ll7)2 cOmpOUnd~ J~i 1 1()47820 - o -I(OCC2H5)2 Compound 6 ~'~

NHC(CH2)5 2 Compound 7~ /0-C-CH2 b-C -CH2 o - The iodoso and iodoxy compounds can generally be pre-pared by methods known in the art. Generally, the iodoxyarylene diester compounds can be prepared by taking the respective iodoxyarylene dichlorides prepared according to Organic ~ynthe-sis, Vol. 22, John Wiley and Sons, 1942, pp. 69-72, and reacting them with the appropriate acid to yield the diester as described in J. Chem. Society, 1970, pp. 862-864. The iodoxy compounds containing the iodine atom in a heterocyclic ring can also be prepared as described in the latter publication.
The oxidants described herein can be used in a wide variety of photographic elements or in photographic film units.
In certain embodiments, the oxidants can be used in photographic elements or film units to provide an oxidant for the synthesis of image dyes. The oxidants can be used to gener-ate oxidized color-developing agent which then reacts with a color coupler to form the image dye. Additionally, these com-pounds can be used to oxidize a compound directly to an image dye as in the case of leuco indoanilines, leuco indophenols, leuco triarylmethanes and other dye precursors.
In one embodiment, the present oxidants are useful in color diffusion transfer processes such as those in which unre-acted color formers in undeveloped or partially developed areas 1~78Z~

of a photographic element diffuse imagewise, after color devel-opment of the exposed layers, to a receiving layer in which the color formers react with oxidized color developer to produce an imagewise distribution of dye. By including a useful oxidant in the receiving layer or having it in association therewith, dyes are formed imagewise in that element as a result of the interre-action of the oxidant, color developer and diffused color former. Processes of this type are described further in British Patent 926,462 dated May 15, 1963.
Examples of processes in which an image is formed upon oxidation of transferred color developer and color coupler are described in U.S. Patents 2,559,293 and 2,698,798. Similarly, the present oxidants can be used in imaging processes based on leuco anthraquinones and other dye precursors which produce dyes when oxidized, or processes based on developers which self-couple upon oxidation, thereby producing dyes. Processes of these latter types are described further in U.S. Patents 2,892,710 and 2,698,798, respectively. Likewise, the described oxidants have utility in color diffusion transfer processes 20 using a leuco developing agent, as discussed in U.S. Patents 2,992,105 and 2,909,430.
In another embodlment, the oxidants can be used to oxidize the developer portion of a dye developer (i.e., a com-pound which contains a silver halide developing moiety and a separate moiety which contains the chromophore of an image dye).
As mentioned above, the oxidants selected must have an oxidation potential sufficient to oxidize the developer portion of the molecule, such as the hydroquinone portion. In this embodiment, the oxidant can function to immobilize the dye developer, such 30 as when it diffuses to the receiver layer, by forming the qui-none, quinonimide, etc., of the developer moiety which is gener-ally quite insoluble in an alkaline processing solution.

1~7820 ~ n still other embodiments, a photographic element containing an oxidant can be treated to ~orm an imagewise dis-tribution of the oxidant. The photo~raphic element can then be contacted ~ith a material ~hich will undergo oxidation to pro-duce an image record in the photographic element. Also, the photographic elcment containing the imagewise distribution of oxidant can be treated to effect di~fusion o~ the oxidant to an adjacent layer wherein it can oxidize materials to produce an image record. In one example of this embodiment, a photographic element containing a silver halide emulsion and an adjacent layer containing a nondiffusible iodoso or iodoxy oxidant can be developed with a silver halide developer. Where silver halide is not developed, the oxidant ~7ill be reduced. The element can then be contacted with a solution of color coupler and color developer to react with the remaining image~7ise distribution of the described oxidant and produce an image dye The o~id~rl~s ~r ~his irlvention are paï ticula-l^ly -~ell-suited for use as oxidants in photographic elements or film units ~hich contain an oxichromic compound of the type described in Belgian Patent 792,598 by Lestina and Bush, mentioned above.
Preferred oxichromic compounds are those which undergo chromo-genic oxidation to form a photographic image dye In one embodiment, the oxidants of this invention are incorporated into pho'ographic elements containing oxichromic compounds of the formula:

D-(COUP)-N-Ar-J
~:herein (COUP) is a photographic color coupler linked to the nitrogen atom through a carbon atom at the coupling position, such as a phenolic coupler~ a pyrazolone coupler, a pyrazolotri-azolc coupler, couplers having open~chain ketomethylene groups _9_ ' ' ~

~471~ZO
and the like; Ar is an arylene group containing from 6-20 carbon atoms, including substituted and unsubstituted arylene groups, fused-ring arylene groups and the likej J can be an amino group, including substituted amines, an hydroxyl group or the group:

-O-C-R
in which R2 is a group containing from 1-12 carbon atoms, which can be an alkyl group, an aryl group, including a substituted alkyl group, a substituted aryl group and the like; Rl is a hydrogen atom or the group:
o -C-R
in which R2 is as defined above and is preferably a polyhalo-genated alkyl group; and D is a group which is (1) a silver hal-ide developing agent which is preferably an aromatic group poly-substituted with hydroxy, amino or substituted amino groups or (2) an oxidizable releasing group (i.e., a group which can be oxidized to facilitate subsequent release of a group or a group which can be oxidized to prevent the normal release of a group under the processing conditions). When D is a silver halide developing agent, the resultant compound preferably is initially mobile. When D is an oxidizable releasing group, the resultant compound preferably is initially immobile.
In still another embodiment, the oxidants of this invention can be used in photographic elements where leuco com-pounds are employed which provide anthraquinone dyes upon oxida-tion. The leuco compounds can be of the type mentioned in U.S.
Patent 2,892,710 issued June 30, 1959, or they can also be improved compounds such as leuco anthraquinone compounds attached to hydroquinone moieties, for example, the compound:

~7~2~

OH OH N-CH2-CH2-~

\t/ \H \~

CH3\~
0~
Typically, the present oxidants are used in either the processing fluid or the image-receiving layer of a dif'f'usion transfer film unit employing other image dye-providing materials mentioned above. The image-transf'er film units can be any of those described in the following patents: U.S. Patents 2,543,181, 2,983,606, 3,227,550, 3,227,552, 3,415,644, 3,415,645, 3,415,646 and 3,635,707, Canadian Patent 674,082, and Belgian Patents 757,959 and 757,960, both issued April 23, 1971.
When used in the processing fluid of various color diffusion transfer film units, the iodoso compounds or iodoxy compounds are typically present in solution in a concentration of about 0.01 to about 0.1 molar. When not contained in the processing fluid~ the present oxidants are coated in at least one layer which typically contains a binder such as gelatin, poly(vinyl alcohol), etc. Of course, the oxidants described herein can also be one of several ingredients as a given layer.
~or example, when used in color diffusion transfer units, the described oxidant can be contained in a mordant layer. In gen-20 eral, the iodoso compounds or iodoxy compounds are coated at a coverage of about 4 to 54 mg/dm2. In preferred emhodiments, the iodoso compounds and iodoxy compounds are used in image-transfer film units which are designed to be processed with a single processing solution, and the resulting positive image is viewed through a transparent support against an opaque back-ground, preferably where all of the silver halide recording lay-ers and the image-receiving layer remain laminated between two dimensionally stable supports after processing.
A suitable image-transfer film unit in which the pres-.ent oxidants are useful typically comprises:
1) a photosensitive element comprising a support hav-ing thereon at least one layer containing a silver halide emul-sion having associated therewith an image dye-providing material and preferably at least three of said layers wherein one layer - . contains`a blue-sensitive silver halide emulsion, one layer con-tains a green-sensitive silver halide emulsion, and one layer contains a red-sensitive silver halide emulsion;
2) an image-receiving layer which can be located on a separate support superposed or adapted to be superposed on said photosensitive element or, preferably, which can be positioned in the photosensitive element on the same support adjacent the photosensitive silver halide emulsion layers; and

3) means containing an alkaline proc~sing composi-tion adapted to discharge its contents within said film unit.
Where the receiver layer is coated on the same support with the photosensitive silver halide layers, the support is preferably a transparent support, an opaque layer is preferably positioned .
between the image-receiving layer and the photosensitive silver halide layer, and the alkaline processing compositi.on preferably contains an opacifying substance such as carbon or pH-indicator dye which is discharged into the film unit between a dimension-ally stable support or cover sheet and the photosensitive ele-, -12-- 1~4782~

ment. In certain embodiments, the cover sheet can be superposed or adapted to be superposed on the photosensitive element7 The image-receiving layer can be coated on the cover sheet. In cer-tain preferred embodiments where the image-receiving layer is located in the photosensitive element, a neutralizing layer is located on the cover sheet.
The means for containing the alkaline processing solu-tion can be any means known in the art for this purpose, includ-ing rupturable containers positioned at the point of desired discharge of its contents into the film unit and adapted to be passed between a pair of juxtaposed rollers to effect discharge of the contents into the film unit, frangible containers posi-tioned over or within the photosensitive element, hypodermic syringes, and the like.
The silver halide emulsions useful in my invention are well-known to those skilled in the art and are described in Product Licensing Index, Vol. 92, December3 1971, publication 9232, p. 107, par. I, "Emulsion types"; they may be chemically and spectrally sensitized as described on p. 107, par. III, "Chemical sensitization", and pp. 108-109, par. XV, "Spectral sensitization", of the above article; they can be protected against the production of fog and can be stabilized against loss of sensitivity during keeping by employing the materials described on p. 107, par. V, "Antifoggants and stabilizers", of the above article; they can contain development modifiers, hard-eners and coating aids as described on pp. 107-108, par. IV, "Development modifiers", par. VII, "Hardeners", and par. XII, "Coating aids", of the above article; they and other layers in the photographic elements used in this invention can contain plasticizers, vehicles and filter dyes described on p. 108, par.
XI, "Plasticizers and lubricants", and par. VIII, "Vehicles", and p. 109, par. XVI, "Absorbing and filter dyes", of the above 1~47820 article; they and other layers in the photographic elements used in this invention may contain addenda which are incorporated by using the procedures described on p. 109, para. XVII, "Methods of addition", of` the above article; and they can be coated by using the various techniques described on p. 109, para. XVIII, "Coating procedures", of the above article.
Any material can be employed as the image-receiving layer in this invention as long as the desired function of mor-danting or otherwise fixing the dye images will be obtained.
The particular material chosen will, of course, depend upon the dye to be mordanted. If acid dyes are to be mordanted, the image-receiving layer can contain basic polymeric mordants such as polymers of amino guanidine derivatives of vinyl methyl ketone such as described by Minsk, U.S. Patent 2,882,156 issued April 14, 1959, and basic polymeric mordants such as described by Cohen et al, U.S. Patent 3,709,690 issued January 9, 1973.
Additional mordants include cationic mordants such as polymeric compounds composed of a polymer having quaternary nitrogen groups and at least two aromatic nuclei for each qua-ternary nitrogen in the polymer cation (i.e., having at leasttwo aromatic nuclei for each positively charged nitrogen atom), such polymeric compounds being substantially free from carboxy groups. Useful mordants of this type are comprised of units of the following formula in copolymerized relationship with units of at least one other ethylenically unsaturated monomer:

_ -CH--C-- ._ R (E) R1 1--N~--R~ e I G

R1 o ~.., ', ~47~3~0 ~herein each of R7 an~ R8 represents a hydrogen atom or a lower alkyl radical (of 1 to about 6 carbon atoms), and R8 can addi-tionally be a group containing at lea.st one aromatic nucleus (e.g., phenyl, naphthyl, tolyl; E can be a divalent alkylene radical (of 1 to about 6 carbon atoms), a divalent arylene radi-cal, a divalent aralkylene radical, a divalent alkarylene radi- :
cal, O O O
_C_oR12_, 0c-Rl2- or -c-NH-Rl2-wherein R12 is an alkylene radical; or R8 can be taken together with E to form a ~0 . .
~N-R12- ' ~, .
' , ~C~o ' ' .

group; R9, R10 and Rll can be lower alkyl or aryl, or R9 and R10 and the nitrogen atom to which they are attached can together with E represent the atoms and bonds necessary to form a quater-nized nitrogen-containing heterocyclic ring, and G ~. is a mono-valent negative salt-formin~ radical or atom in ionic relation-ship with the positive salt-forming radical; wherein said poly-mer is substantially free from carboxy groups and wherein the positive salt-forming radical of said polymer comprises at least two aryl groups for each quaternary nitrogen atom in said poly-mer. These preferred.polymeric cationic mordants are described ~urther in the above-mentioned U S. Patent 3,709~690. .
Other mordants useful in my invention include poly-4- ..
vinylpyridine, the 2-vinylpyridine polymer metho-p-toluenesul- .
fonate and similar compounds descri~ed in Sprague et al, U.S.

Patent 2,484,430 issued October 11, 1949, and cetyl trimethylam-monium bromide, etc. Effective mordanting compositions are also . . ~

~L~)47B20 described in U.S Patents 3,271,11~8 by Whitmore and 3,271,147 by Bush, both issued September 6, 1966.
The term "image dye-providing material" as used herein is understood to refer to those compounds which either 1) do not require a chemical reaction to ~orm the image dye or 2) undergo reactions encountered in photographic imaging systems to produce an image dye, such as with color couplers, oxichromic compounds and the like. The first class of compounds is generally referred to as preformed image dyes and includes shifted dyes, etc., while the second class of compounds is generally referred to as dye precursors.
The terms "initially mobile" and "initially immobile"
as used herein refer to compounds which are incorporated in the photographic element and, upon contact with an al~aline process-ing solution, are substantially mobile or substantially immo-bile, respectively.
The following examples are included for a further understanding of the present invention. In these examples, all temperatures indicated are centigrade. All oxidants referred to are found in Table 1 below The structural formulas for other compounds used are found in the footnotes to the examples.
Example 1 The oxidants listed in Table 1 below are tested as follows: A matrix element is prepared comprising a transparent film base support having a layer of 125 mg./ft.2 gelatin and 50 mg./ft.2 of oxichromic compound dissolved in 75 mg./ft.2 of diethyl lauramide. A receiver element i prepared comprising a transparent film base support having on it a first layer of 200 mg./ft.2 of the mordant copoly[styrene:N,N-dimethyl-N-benzyl-_-3-maleiimidopropyl)ammonium chloride] in 100 mg./ft.2 of gelatin and a second layer (over the first layer) comprising 2000 mg./
ft 2 of titanium dioxide in 200 mg./ft.2 of gelatin. The two , . ~

-~6~478ZU
elements are then placed in fac -to-face contact for 60 sec.
with an alkaline processing composition, comprising 20 g. of oxidant/liter o~ an aqueous solution o~ 4~ potassium hydroxide and 2.5~ hydroxyethyl cellulose, spread between the elements.
Upon contact of the two elements, the oxichromic compound migrates ~rom the matrix through the processing composition and the titanium dioxide layer into the mordant layer o~ the receiver. The oxichromic compound is oxidized by the iodoso oxidant to the corresponding dye which is visible through the transparent support and against the white background of the titanium dioxide layer. The oxichromic compounds and the oxi-dants used, as well as the color and reflection density of the dye in the receiver are shown in Table 1 below.

Table 1 Color of Dye Oxidant* Oxichromic Compound** in Receiver Dmax 1 A yellow 1.75 1 B magenta 1.00 1 C cyan 1.45 2 A yellow `1.30 2 B magenta 2-35 2 C cyan 1.34 *Oxidants:

Oxidant 1 I=O

Oxidant 2 tl~"~

**Oxichromic Compound:

(CH3)3CCCHC~l \ ~ N~I ( 2)4 c 1 J~ ~Cl OH

, 1~D478ZO
OH
N - N "(C~2)3 ~\ ~ ~ICO(CH2)4 ~ j NH H OH
Cl ~

OH . ) J
OH J ~ - NIICO~F
C j ~ (cH2)4coNH ~,l FF' OH ~ `
Cl- ~ - Cl OH

Example 2:
An integral color-transfer, photographic element is prepared having the following structure:
1) transparent polyethylene terephthalate support;
2) dye mordant layer containing gelatin at 100 mg./ft.2, - copoly[styrene:_-benzyl-N,N-dimethyl-N-(3-maleimidopropyl)-ammonium chloride] at 200 mg./ft.2 and iodoso Oxidant 1 at 200 mg./ft.2;
3) layer containing titanium dioxide at 2000 mg./ft.2 and gela-tin at 200 mg./ft.2;

4) layer containing carbon opacifying agent at 200 mg./ft.2 and gelatin at 156 mg./ft 2;

5) layer containing gelatin at 75 mg./ft.2, 2,5-di-sec-dodecyl-hydroquinone at 70 mg./ft.2 and tricresyl phosphate at 23 mg./ft.2;

6) layer containing a red-sensitive silver bromoiodide emulsion at 70 mg./ft.2 based on silver, gelatin at 230 mg./ft.2, Compound D* at 42 mg./ft.2 dispersed in diethyl lauramide at 73 mg./ft.2, 5-(2-cyanoethylthio)-1-phenyltetrazole at 5 mg./ft.2 dispersed in tricresyl phosphate at 15 mg,/ft.2 and ; -18-.

1~47820 5,6,7,8-tetrahydro-5,8-methano-1,4-naphthalenediol at 10 mg./ft 2, OH
OH ~ ~ ~ NHCC ~ ~ C5Hll n D ~ J (CH2)4CONH ~

OH
Cl ~ Cl OH

7) layer containing gelatin at 300 mg./ft.2, 2,5-di-sec-dodec-ylhydroquinone at 70 mg./ft.2 and a magenta filter dye at 30 mg./ft.2 dissolved in diethyl lauramide at 50 mg./ft.2;

8) layer containing green-sensitive silver bromoiodide emulsion at 70 mg./ft.2 based on silver, gelatin at 230 mg./ft.2, Oxichromic Compound B at 54 mg./ft.2 dispersed in diethyl lauramide at 64 mg./ft.2, 5-(2-cyanoethylthio)-1-phenyltet-razole at 5 mg./ft.2 dispersed in tricresyl phosphate and 5,6,7,8-tetrahydro-5,8-methano-1,4-naphthalenediol at 10 mg./ft.2;

9) layer containing gelatin at 300 mg./ft.2, 2,5-di-sec-dodec-ylhydroquinone at 70 mg./ft.2 and a yellow filter dye at 100 mg./ft.2 dispersed in diethyl lauramide at 28 mg./ft.2,

10) layer containing a blue-sensitive silver bromoiodide emul-sion at 70 mg./ft.2 based on silver, gelatin at 210 mg./
ft.2, Oxichromic Compound A at 64 mg./ft.2 dispersed in diethyl lauramide at 106 mg./ft.2, 5-(2-cyanoethylthio)-1-phenyltetrazole at 5 mg./ft.2 dispersed in tricresyl phos-phate at 15 mg./ft.2 and 5,6,7,8-tetrahydro-5,8-methano-1,4-.
naphthalenediol at 10 mg./ft.2;

11) layer containing gelatin at 50 mg./ft.2.
A transparent cover sheet for the above element is prepared as follows:
1) transparen~ polyethylene terephthalate support;

- .: ' ' ':

1~47~3ZO
;2) layer containing gelatin at 900 mg./ft.2, polyacrylic acid at 900 mg./ft.2 and imidazole at 760 mg./ft.2;
3) layer containing cellulose acetate at 1140 mg./ft.2 and copoly(styrene-maleic anhydride) at 60 mg./ft.2.
The photographic element is exposed through a multi-color, graduated-density test object, the transparent cover sheet is superposed on the element, and a pod containing an opaque processing composition is ruptured to discharge between the cover sheet and the photosensitive element by passing the film unit through juxtaposed rollers having a gap of about 8 mils. The processing composition is as follows:

potassium hydroxide 51 g./l.
hydroxyethyl cellulose 30 g./lh potassium bromide 40 g./l.
~-benzylpicolinium bromide 15 g./l.
5,6,7,o-tetrahydro-5,8-methano-1,4- 15 g./l.
naphthalenediol carbon 40 g./l.

After about 1 to 2 min., a well-defined color image with excellent color reproduction is viewed through the trans-parent support of the integral element.
AIthough the invention has been described in consid-erable detail with particular reference to certain preferred embodiments thereof, variations and modifications can be effec-ted within the spirit and scope of the invention.

,~

Claims (21)

We claim:

1. A photographic element comprising a support having thereon at least one photographic image-receiving layer and at least one layer containing an oxidant of the formula:
R-Q
wherein Q is an iodoxy group or an iodoso group, and R is a group containing a 5- to 7-membered carbocyclic or heterocyclic group covalently bonded to the iodine atom of Q through a carbon atom of said cyclic group.

2. A photographic element according to Claim 1 wherein R contains an aromatic carbocyclic nucleus covalently bonded to Q.

3. A photographic element according to Claim 1 wherein Q is an iodoxy group which is an iodoxy diacetate.

4. A photographic element according to Claim 1 wherein R contains a ballast group.

5. A photographic element according to Claim 1 wherein R contains an aromatic carbocyclic group covalently bonded to Q and Q is an iodoxy diacetate group.

6. A photographic element comprising a support having thereon at least one photographic image-receiving layer, at least one layer thereon containing an image dye-providing mate-rial and at least one layer containing an oxidant of the for-mula:

R-Q

wherein Q is an iodoxy group or an iodoso group, and R is a group containing a 5- to 7-membered carbocyclic or heterocyclic group covalently bonded to the iodine atom of Q through a carbon atom of said cyclic group.

7. A photographic element according to Claim 6 wherein said image dye-providing material is an image dye pre-cursor.

8. A photographic clement according to Claim 6 wherein said image dye-providing material is associated with a silver halide emulsion.

9 A photographic element according to Claim 6 wherein R contains an aromatic carbocyclic group covalently bonded to Q and Q is an iodoxy diacetate group.

10. A photographic film unit comprising a support hav-ing thereon at least one layer containing a silver halide emul-sion having associated therewith an image dye-providing mate-rial, an image-receiving layer containing an image-dye mordant, means for discharging an alkaline processing solution within said film unit, and at least one layer containing an oxidant of the formula:
R-Q
wherein Q is an iodoxy group or an iodoso group, and R is a group containing a 5- to 7-membered carbocyclic or heterocyclic group covalently bonded to the iodine atom of Q through a carbon atom of said cyclic group

11 A photographic film unit according to Claim 10 wherein said layer containing said image-dye mordant is located on a support separate from said layer containing silver halide.

12. A photographic film unit according to Claim 10 wherein said layer containing said image-dye mordant is present on the same support adjacent said layer containing said silver halide emulsion.

13. A photographic film unit according to Claim 10 wherein said image dye-providing material is an oxichromic com-pound.

14. A photographic film unit according to Claim 10 wherein said image dye-providing material is an oxichromic developer having the formula:

wherein (COUP) is a photographic color coupler linked to the nitrogen atom through a carbon atom at the coupling position; Ar is an arylene group containing from 6-20 carbon atoms; J is selected from an amino group, an hydroxyl group or a group hav-ing the formula:

wherein R2 is a group containing from 1-12 carbon atoms and is an alkyl or aryl group; R1 is a hydrogen atom or a group having the formula:
wherein R2 is as defined above; and E is a silver halide devel-oping agent or an oxidizable releasing group.

15. In a photographic process wherein an image dye-providing material is oxidized to provide an image-dye record, the improvement wherein said material is oxidized by an iodoso compound having a polarographic reduction potential more posi-tive than about -0.5 v.

16. A photographic film unit comprising:
a) a photosensitive element comprising a support having thereon a layer containing a red-sensitive silver halide emul-sion having associated therewith a cyan image dye-providing material, a layer containing a green-sensitive silver halide emulsion having associated therewith a magenta image dye-providing material, and a layer containing a blue-sensitive sil-ver halide emulsion having associated therewith a yellow image dye-providing material;
b) an image dye-receiving layer; and c) means for discharging an alkaline processing composition within said film unit;
said film unit containing an iodoxy compound having the formula:
wherein Q is an iodoxy diester and Z is a group containing the atoms necessary to form a 5- to 7-membered carbocyclic ring with the carbon atom of said formula.

17. In a photographic element comprising a support, at least one image-receiving layer and at least one layer contain-ing a silver halide emulsion having associated therewith an image-dye precursor, the improvement comprising at least one layer containing an iodoso compound having the formula:

wherein X is a carboxylic acid group or a sulfonic acid group, and Z represents a group containing the atoms necessary to form a 5- to 7-membered ring with the remainder of the atoms of said formula

18. In a photographic element comprising a support, at least one image-receiving layer and at least one layer contain-ing a silver halide emulsion having associated therewith an image-dye precursor, the improvement comprising at least one layer containing an iodoxy compound of the formula:
wherein Q represents an iodoxy group with the iodine atom bonded to the carbon atom shown in said formula, and Z represents a group containing the atoms necessary to form a 5- to 7-membered carbocyclic or heterocyclic ring with the carbon atoms in said formula.

19. A photographic element according to Claim 18 wherein Z represents a group containing the atoms which form an aromatic carbocyclic ring with the carbon atom of said formula.

20. A photographic element according to Claim 18 wherein Q is an iodoxy diacetate.

21. A photographic element according to Claim 18 wherein said image-dye precursor is an oxichromic compound.