Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials

Definitions

• Silver-dye-bleach photographic elements can be prepared which incorporate at least one photosensitive layer including silver halide and having in association with said silver halide, either in the photosensitive layer or a contiguous hydrophilic colloid layer, either a non-diffusible, bleachable dye and a developing agent free from any dye moiety or a non-diffusible dye developer.
• These silver halide elements after a suitable exposure, can be processed to develop silver images by immersion in an alkaline activator solution.
• This invention relates to photography, and more particularly to silver-dye-bleach photographic materials and processes.
• the silver-dye-bleach process employs a photographic material comprising at least one photosensitive silver halide emulsion layer which is associated with a preformed bleachable dye.
• a typical multicolor silver-dye-bleach element is composed of three silver halide layers respectively sensitized to red, green, and blue radiation, and having in association therewith, respectively, a bleachable cyan, magenta and yellow dye.
• the processing of such an element for obtaining a positive multicolored photographic reproduction generally includes exposing said element to a light pattern, developing it to a negative silver image in a black-and-white silver halide developer solution, treating it in a dye-bleach bath which oxidizes the silver image to a silver salt and concurrently decolorizes the associated pattern of dye, and, finally removing the residual silver salt by fixing and washing.
• a dye image is left which is photographically the inverse of the initial silver image.
• Prolonged development times which may be resorted to as a compensation for such a developer exhaustion for the adequate reduction of the exposed silver halide in the lower emulsion layers usually results in overdeveloping the exposed silver halide in the upper emulsion layers.
• One object of this invention is to provide novel photographic silver-dye-bleach materials which are developable within shorter periods of time than prior art silver-dyebleach materials.
• Another object of this invention is to provide novel photographic silver-dye-bleach materials, which upon being developed, yield more complete and uniform silver images in each and all of the exposed photosensitive layers.
• a further object of this invention is to provide novel photographic silver-dye-bleach .processes which yield improved dye images.
• Another object of this invention is to provide novel photographic silver-dye-bleach processes which feature development with simple alkaline activator solutions.
• Still another object of this invention is to provide novel methods of processing silver-dye-bleach elements.
• silver-dye-bleach elements comprising a support having coated thereon at least one silver halide emulsion layer, which layer has in association therewith a nondiifusible bleachable dye and a developing agent free from any dye moiety.
• silver-dyebleach elements suitable for providing multicolored images comprising a support having coated thereon separate overlying light-sensitive silver halide emulsion layers, each of said layers having in association therewith a non-diifusible bleachable dye and a developing agent free from any dye moiety.
• At least three separate light-sensitvie silver halide emulsion layers are provided which are respectively sensitized to red, green, and blue radiation and which have in association therewith, respectively, non-diffusible bleachable cyan, magenta and yellow dyes, and at least two separate non-light-sensitive hydrophilic colloid layers containing developing agent free from any dye moiety, said layers being arranged so that each of said light-sensitive layers is contiguous to at least one of said hydrophilic colloid layers.
• the dye-bleach element has a dye-bleach catalyst incorporated therein, preferably in a light-sensitive layer thereof.
• the presence of catalyst in association with a light-sensitive layer in elements in accordance with the invention functions to further decrease processing time.
• a process for developing the silver halide to a silver image in silver-dye-bleach elements having an alkali-activatable (at a pH over about 9.0) developing agent in association with a silver halide emulsion having a pH lower than about 7.0, which features raising the pH of the emulsion to at least 9.0, and preferably over 10.5, such as up to about 12.0. Especially good results are obtained at a pH of about 11.5.
• the'pI-l of the emulsion is raised by contacting it with an alkaline solution.
• a novel process for obtaining positive dye images in an exposed photographic element comprising a support having coated thereon light-sensitive silver halide dispersed in a hydrophilic colloid binder, said layer having incorporated therein or in a contiguous hydrophilic underlayer, a non-diffusible dye developer, said dye developer containing within each molecular both a bleachable dye moiety and a developing agent moiety by contacting said element with an alkaline solution to develop a negative silver image therein at a pH below that which will cause diffusion of said dye developer; and, bleaching said dye developer only in the areas of said silver image.
• the process of this embodiment of the invention is useful in producing multicolored records, for example by using photographic elements having separate layers sensitive to blue, green and red radiation, each of said layers containing, respectively, yellow, magenta and cyan dye developers.
• a cross-oxidizing auxiliary developer may be present in or contiguous to the light-sensitive layer.
• development is effected under alkaline conditions, but at a pH lower than that which will cause diffusion of the bleachable dye.
• the most useful pH ranges are from about 9.5 to about 12.0 or 12.5. At higher pH levels, such as 13 to 14, diffusion of the dye developer results in the loss of satisfactory color rendition.
• Especially rapid development may be achieved by adding a black-and-white developer to the alkaline solu tion.
• bleaching of the dye is conducted in the presence of a dye-bleach catalyst, which may be incorporated in the light-sensitive layer, a layer contiguous thereto, or in the processing solutions. Thereafter, the metallic silver may be removed in any convenient manner leaving the dye image.
• a dye-bleach catalyst which may be incorporated in the light-sensitive layer, a layer contiguous thereto, or in the processing solutions.
• the metallic silver may be removed in any convenient manner leaving the dye image.
• the dye developers employed herein are, under the processing conditions used, non-diifusible in the sense that they do not migrate through or out of the entire photographic element. They may be slightly mobile under the processing conditions used so that the dye developer will move into an overlying, contiguous silver halide emulsion. This property of the dye-developers permits use thereof, therefore, either in the emulsion layer or in a layer below the emulsion layer and contiguous thereto.
• the term non-diffusible refers to the fact that the dye developers will not bleed out of the photographic element or diffuse into non-contiguous layers of the element.
• Gelatin interlayers may be employed in multilayer coatings to assist in preventing diffusion of dye-developer into certain layers.
• developing agents which may be incorporated in silyer-dye-bleach elements in accordance with the invention include all of those which are compatible within the predominantly aqueous medium of photographic silver halide emulsions and which have no adverse effects on such emulsions.
• developing agents includes developing agent precursors which release developing agent on treatment at high pH, 'e.g., with alkali.
• Any conventional developing agents may be used including, for example: p-phenylenediamines, p-aminophenols, hydroquinones, aminopyrazoles, aminopyrazolines, pyrazolidones, o-phenylenediamines, o-aminophenols, p-aminophenols, o-diaminophenols, p-diaminophenols, 3-pyrazolidones, 4-aminopyrazolones, 3-aminopyrazolines.
• developer-precursors which release developer upon treatment at high pH, for example with alkaline solutions.
• Developing agent precursors useful in the photographic elements of the invention include the amide compounds disclosed in U.S. Ser. No. 183,354, filed Mar. 29, 1962, now abandoned and continuation-in-part of U.S. Ser. No. 373,050, filed June 5, 1964, and now Patent No. 3,291,609.
• Typical useful developing agent precursors disclosed therein which are useful in this invention have the general formula:
• R represents alkyl or halogenoalkyl
• R represents a hydrogen atom or an alkyl group
• R represents a hydrogen atom, an alkyl group, a halogen atom, an alkoxyl group, an acylamido group or an acyloxy group.
• Specific useful developing agent precursors include o-(N- trifluoracetyl)aminophenol; p (N trifiuoracetyDaminophenol and 2,4-(N,N-trifluoracetyl) diaminophenol.
• auxiliary developing agents include those described in the copending application Ser. No. 134,014, filed Aug. 5, 1961, now abandoned, of RH. Stewart, G. E. Fallesen and J. W. Reeves, Jr.
• Typical auxiliary developing agents described in this application include 3-pyrazolidone, compounds containing an alkyl (e.g., methyl, ethyl, etc.) or aryl substitutent (e.g., phenyl p-tolyl, etc.).
• such pyrazolidone developing agents can contain an acyl or acyloxy substituent which can be hydrolyzed from the 3-pyrazolidone compound by treatment with the above activator solutions to produce the desired auxiliary developing compound.
• Typical auxiliary developing agents include, for example, l-phenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, l-phenyl-5-methyl-3-pyrazolidone, l-acetamidophenyl-3-pyrazolidone, 3-acetoxy-1-phenyl-3-pyrazolidone (enol ester), 2-(pyridinium acetyl)-l-phenyl-3-pyrazolidone chloride, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-
• phenyl-4-methyl-3 -pyrazolidone l-phenyl 2 benzoyl-3- pyrazolidone, 1-phenyl-2-lauroyl-3-pyrazolidone, l-phenyl-2-chloroacetyl-3-pyrazolidone, etc.
• auxiliary developing agents can be varied, and of course, no auxiliary developing agent need be employed unless so desired.
• Useful concentrations of auxiliary developing agents vary from about 0.01 mole to 2.0 moles per mole of the precursor. Depending upon the particular auxiliary developing agent employed, larger or smaller quantities can be used.
• the concentration of the developing agent used in the invention will vary, depending upon the particular chemical compound involved and the location of the compound within the photographic element. If the developing agent is incorporated within the silver halide emulsion layers undergoing development, it may be desirable to use a somewhat difierent concentration than would be used if the developer were incorporated in a layer contiguous to the photographic silver halide emulsion.
• a preferred concentration of developer for incorporation in the emulsion is from about 0.1 to 4.0 moles per mole of silver halide.
• a particularly useful range is from about 0.25 to 2.0 moles per mole of silver halide, with especially useful results being obtained within the range of about 0.4 to 1.0 moles per mole of silver halide.
• concentrations of developer compound can be tolerated without adverse effects.
• concentrations of the developing agents associated with the various photographic materials of the invention can be varied, for instance, in such a way that the concentrations of developing agents associated with the lower of the photosensitive layers is progressively higher than in the upper photosensitive layers.
• the developing agents are advantageously added to the photographic materials of the invention in any convenient manner, depending on the chemical composition and compatibility at the desired concentrations with the predominantly aqueous medium of the photographic material.
• the developing agents can be diffusible or ballasted so to remain essentially stationary in the photographic element.
• developing agents which may be introduced into the photographic element according to coupler solvent dispersion techniques. Certain developing agents can be added from an aqueous solution, others, e.g., by the Fischer method, such as that as applied to dye-forming couplers described in U.S. Patent 2,186,849, and as applied to ultraviolet absorbers as described in U.S. Patents 2,685,512; 2,719,086; 2,739,888; and 2,784,087.
• Nondiifusing developing agents can be incorporated in the emulsion layers or in layers adjacent thereto by solvent dispersion techniques such as are described for oil-soluble couplers in U.S. Patent 2,304,939, U.S. Patent 2,322,027, high-boiling organic solvents and by methods described in U.S. Patent 2,801,171 and U.S. Patent 2,949,- 360, in which low-boiling or water-soluble organic solvents are used with or in place of the high-boiling solvent.
• the distribution of the developing agents within the photographic element can be varied to include the presence of developing agents either in all or only one of the photosensitive layers or in several or only one separate non-light-sensitive layer adjacent to the silver halide emulsion layer.
• Combinations of various kinds of developing agents can be used.
• the embodiments of our invention also make allowance for the additional presence in our photographic material of development accelerators as are, for example, disclosed in the Belgian Patent 621,608, based on U.S. Ser. No. 134,014, filed Aug. 25, 1961, of development promoter precursors, for example, the esters disclosed in U.S. Patent 3,041,170.
• the developing agents in our photographic materials can be tanning developers, for example, those disclosed in U.S. Patents 2,592,368,
• tanning developers in our system is considered to be advantageous based on the following considerations: development of the silver halide takes place in those areas of our photographic element, which upon completion of the processing cycles, are void of any dye and therefore transparent to white light. When development is effected by the use of a tanning developer, the gelatin associated with the silver halide being reduced in these areas is insolubilized and contracts. This contraction provides for a somewhat thinner gelatin stratum and, consequently, a more transparent element which results in a reproduction having colors of improved brilliance.
• the choice of kind, activity, distribution, concentration, and method of dispersing developing agents can, of course, be determined depending on the particular silverdye-bleach materials used, on the composition of the activator available or preferred, and on specific visual characteristics which the final reproduction is designed to exhibit.
• Dyes useful in the developer-containing elements of our invention are those commonly employed in silverdye-bleach materials and include the dye disclosed, for instance, in Gaspar, U.S. 2,055,407 and U.S. 2,564,238 and in British Patents 939,009; 940,286, and 607,792; azoxy dyes disclosed in Swiss Patent No. 386,247, published Apr. 15, 1965.
• the bleachable dye-developers employed herein are molecules which contain both a bleachable dye moiety and a moiety which develops exposed silver halide to metallic silver, the developing action taking place only under alkoline conditions at a pH of over about 9.0 and at a pH less than that which will cause unwanted diffusion of the dye developer in the hydrophilic colloid in which such agents are incorporated.
• These dye developers are used in similar concentrations, and dispersed in emulsions in a similar manner, to the dye-free developing agents described obove.
• Dye developers useful herein may be represented by the following formula:
• D represents the bleachable dye moiety, D the developing moiety and X a suitable linking group.
• D can be any dye capable of being reduced by suitable bleaching agents in the presence of metallic silver and, as a result of this action, is decolorized; e.g., azo dyes, oxazine dyes, and certain anthraquinone dyes, phthalocyanine dyes, triphenylmethane dyes, fortmazans, and salts of formazans;
• D is a group containing an aryl nucleus substituted by at least two substituents selected from hydroxyl, amino, and substituted amino groups, so that the resulting compound is capable of reducing exposed silver halide to metallic silver;
• X is a linking group such as: -CO; -CR wherein R can be hydrogen, alkyl, or aryl; SO CR wherein R is a di-bonded hydrocarbon residue; e.g., alkylene or aryl;
• -COR'CO e.g., a diacyl residue 'of a dibasic organic acid or of an acid anhydride
• X may be a di-bonded alicyclic or heterocyclic residue; e.g., a cyclohexyl ring or an striazinyl ring.
• the s-triazinyl radical which constitutes the linking group may be further substituted by a second dye unit or developer unit whereby the developing potential or the color properties of the dye developer may be adjusted to meet a particular need.
• Bleachable dye developers employing the group CO-alkylene as the linking group may be prepared by reacting a dye containing at least one primary or secondary reactive amino group with a derivative of a compound of the formula:
• D is a dye unit.
• D is a dye unit.
• Dye developers of the type described above can be prepared by uniting a dye of a desired predetermined color with a group possessing a silver halide developing function to obtain a dye developer having substantially the same color as the chosen dye and substantially the same developing power as the developer. Use of such techniques thus permits one to obtain dye developers of predetermined color characteristics and thus greatly broadens the field of choice of dye developers.
• suitable compounds which form developer moieties in combination with out bleachable dyes are:
• alkylamino, alkyl, hydroxyl, alkoxy, halogen Catechols Pyrazolidones for instance those disclosed in US. Patent No. 2,751,297, assigned to Kodak Ltd.
• Open chain, carboxylic and heterocyclic developing agent groups can be used, e.g., residues of ascorbic acid, aromatic developing agents, such as substituted benzenes and variously substituted pyrazolidones.
• non-dififusible refers to bleachable dye or to bleachable dye developers which do not bleed out of the photographic element, or into layers other than contiguous layers at the pH coated, or at the elevated pH used during processing.
• this invention relates to photographic elements and processes, including both development and bleaching of the elements employed herein.
• Silver images can be obtained in exposed silver-dyebleach elements by raising the pH thereof to over about 9.0 and preferably over 10.5.
• the pH is raised by treatment with an alkaline material, such as an activator solution.
• activator baths comprise, for example, an aqueous solution of an alkaline material, such as sodium carbonate, sodium hydroxide, potassium carbonate, potassium hydroxide, mixtures of sodium hydroxide and sodium sulfite, etc.
• a bath of the latter type is quite suitable for developing an exposed silver-dyebleach film strip in about 30 seconds when the activator bath is at about 68 F. Modifications can easily be made in the activator baths without departing from the spirit and scope of the invention.
• an aqueous solution comprising about 4% of sodium carbonate and 5% of sodium sulfite produces development in about seconds at 68 F.
• Another aqueous activator solution comprising 2% sodium hydroxide and 5% sodium sulfite produces useful photographic images in a few seconds when heated to 130 F.
• Particularly useful activator solutions have a pH of at least about 9.0 and preferably of at least about 10.5.
• the activator solutions can be applied according to the present invention in any number of known ways, such as by dipping, spraying, or other suitable surface applications. If desired, a thickener can be added to the activator solution to increase the viscosity of the composition and make it more adaptable for continuous processing. Viscous compositions can then be removed by squeegeeing or water spraying.
• the dyeblaech catalyst may be incorporated in the same layer as the developing agent, or in a separate layer.
• Good results can be obtained by incorporating the dye-bleach catalyst in a layer contiguous to the light-sensitive layer.
• the catalyst is incorporated in one or all of the silver halide emulsion layers.
• the presence of dye-bleach catalyst serves to further reduce processing times of the elements of the invention, and to provide superior color images. Any elfective concentration of catalyst may be employed.
• Good results are obtained with from 5.0 to 80.0 grams of catalyst per mole of silver, with especially good results at 10.0 to 40.0 grams of catalyst per mole silver. Any compound useful for catalyzing dye destruction in the dye-bleach process may be employed.
• Phenazine and quinoxaline compounds are especially useful catalysts. Some particularly useful catalysts are listed below:
• the bleachable magenta dye is Solantine link 4BL having the formula:
• the bleachable cyan dye is Diphenyl Fast Blue-Green BL 15 having the formula:
• EXAMPLE 2 A silver-dye-bleach element is prepared similar to that described in Part A of Example 1, except that the norbornanehydroquinone in Layers C and E is replaced with 120 mg./ft. of 4-methyl phenyl hydroquinone.
• EXAMPLE 3 The procedure of Example 1, Part A is repeated except that the activator bath (see Part A, Example 1) contains, in addition, 1.0 gm. of 1-phenyl-3-pyrazolidone.
• EXAMPLE 4 Two silver-dye-bleach elements, as described in Parts A and B of Example 1, are prepared. Each element is exposed according to the procedures in Example 1, but through a red filter. The element containing developing agents is processed for 30 seconds in the activator solution of Part A of Example 1. The element not containing developing agents is processed for 3 minutes in the developing solution of Part B of Example 1. Each element is then fixed, washed, and dried. Sensitometric evaluation of the black-and-white images in layers F of each sample show a higher maximum density and contrast in the element containing the developing agents and having been processed in the activator solution (i.e., the solution of Part A of Example 1). This example demonstrates that a more complete reduction of the exposed silver halide in the lowest layer of a multilayer silver-dye-bleach material can be effected according to my invention.
• EXAMPLE 5 Two silver-dye-bleach elements, as described in Example 1, were exposed through a red filter and processed. A black-and-white developing time of 30 seconds was employed for each element. The developer described in 13 column 11, lines 74-75, and column 12, lines 1-29 was used for the element of Part B. The cyan dye images obtained were sensitometrically evaluated. It was found that the image in the material containing the developing agents had higher contrast and lower minimum dye density.
• EXAMPLE 6 Two silver-dye-bleach elements, as described in Parts A and B of Example 1, were prepared. Each element was exposed according to the procedures in Example 1. The element containing developing agents was processed for 30 seconds at atemperature of 125 F. in the activator solution of Part A of Example '1. Separate samples of the element not containing developing agents were processed for 1, 5, l0, and 15 minutes at a temperature of 125 F.-in the developing solution described in column 11, lines 7475, and column 12, lines 1-29. Each element was then fixed, Washed and dried. The element processed with the activator solution gave an excellent color reproduction. The samples processed with the developing solution showed fog which ranged from a low level at the 1 minute development time to complete blackness at the and minute development time. No acceptable image was obtained even at the lowest fog level.
• EXAMPLE 7 Results similar to those obtained in Example 1, Part A are obtained when the developer employed is a p-phenylenediamine, a hydroquinone, an aminopyrazole or ascorbic acid and the catalyst is a phenazine, Z-methyl pyrazine, 6-nitroquinoxaline or 2,3-diphenylquinoxaline.
• EXAMPLE 8 A photographic silver-dye-bleach material was prepared by coating on a cellulose acetate film base in sequence the following layers:
• the above sample contained a direct positive magenta dye image.
• EXAMPLE 9 A film material was prepared and processed as described in Example 8 except that development was accomplished in 2.5 seconds at 75 F. in the following developer solution:
• EXAMPLE 10 A sample of the film material was prepared and processed as described in Example v8 except that the following activator solution was used in place of the developer solution of Example 8:
• EXAMPLE 11 A photographic silver-dye-bleach material was prepared by coating on a cellulose acetate film base, in sequence, the following layers:
• EXAMPLE 12 A photographic silver-dye-bleach material was prepared by coating on a cellulose acetate film base, in sequence, the following layers:
• a silver-dye-bleach element was prepared by dispersing the magenta dye developer by means of diethyl lauramide and triethyl phosphate, in a green sensitized silver halide emulsion and coating the material on a white pigmented cellulose ester film support to give a dry coverage of 16 mg./ft. of silver, 300 mg./ft. of gelatin, and 50 mg/ft? of the dye developer:
• Example 13 was repeated with a red-sensitized silver halide emulsion except that the dye developer used was the cyan dye developer.
• Example 13 was repeated with an essentially bluesensitive silver halide emulsion, except that the dye developer used was the yellow dye developer.
• the dye developer used was the yellow dye developer.
• Example 15 was repeated to obtain a yellow image by using 1 ⁇ 4-['y-(hydroquinonyl)pr0pyl]phenyl ⁇ 3 (N- 1 7 hexylcarbamyl) 4-[3-(hydroquinonyl) phenylazo1-5-pyrazolone N: C ONHOQHB
• the following dye developers were used to prepare and process silver-dye-bleach elements as described in Example 12, each of which yielded a direct positive yellow dye image.
• N N 00002115 CH3 o1 I 1 CHzCH2 1- ⁇ 4-[5-(hydroquinonyl)ethy1] phenyl ⁇ -3-[N-('y-hydroxypropyl carbamyl] -4*mesitylazo-5-pyrazolone:
• EXAMPLE 18 A photographic silver-dye-bleach material is prepared by coating on a cellulose acetate film base, in sequence the following layers:
• the dye developers of this invention may be utilized in the photo-sensitive element, for example in, on or behind the silver halide emulsion.
• the coatings or layers of the dye developer is placed behind the silver halide emulsion, which has the advantage of minimizing any light-filtering action by the colored dye developer.
• the pH of the black-and-white activator is adjusted to be below approximately 13 to prevent undesirable diffusion.
• Auxiliary developing agents of the type mentioned above may also be used in addition to dye-developers.
• non-diffusible bleachable cyan, magenta and yellow dyes each of said layers having in association therewith a developing agent, which comprises:
• the method of producing a negative silver image in an exposed photographic element comprising a support having coated thereon a light-sensitive silver halide emulsion having a pH lower than about 7.0, said emulsion having in association therewith a bleachable dye and an alkali activatable developing agent, which comprises raising the pH of the emulsion to over about 9.0 but below the pH at which said bleachable dye diffuses from said emulsion.
• the method of producing a negative silver image in an exposed photographic element suitable for providing multicolor images comprising a support having coated thereon separate overlying light-sensitive silver halide emulsion layers which are sensitized, respectively, to red, green and blue radiation and which have in association therewith, respectively, non-difiusible bleachable cyan, magenta and yellow dyes, said layers having a pH lower than about 7.0, and at least two separate, non-light-sensitive hydrophilic colloid layers containing a developing agent, said layers being arranged so that each of said lightsensitive layers is contiguous to at least one of said hydrophilic colloid layers, which comprises raising the pH of said emulsion layers to about 10.5.
• a photographic element comprising a support having coated thereon a silver halide emulsion layer, said layer having in association therewith a developing agent free from any dye moiety and a non-diffusible bleachable dye.
• a photographic element comprising a support having coated thereon a silver halide emulsion layer, said layer having in association therewith a non-difiusible bleachable dye, a dye-bleach catalyst and a developing agent free from any dye moiety.
• a photographic element suitable for providing multicolor images comprising a support having coated thereon separate overlying light-sensitive silver halide emulsion layers, each of said layers having in association therewith a developing agent free from any dye moiety and a non-diifusible bleachable dye.
• a photographic element suitable for providing multi-color images comprising a support having coated thereon separate overlying light-sensitive silver halide emulsion layers which are sensitized, respectively, to red, green and blue radiation and which have in association therewith, respectively, non-diitusible bleachable cyan, magenta and yellow dyes, and at least two separate, nonlight-sensitive hydrophilic colloid layers containing a developing agent free from any dye moiety, said layers being arranged so that each of said light-sensitive layers is contiguous to at least one of said hydrophilic colloid layers.
• a photographic element suitable for providing multi-color images comprising a support having coated thereon separate overlying light-sensitive silver halide emulsion layers which are sensitized, respectively, to red, green and blue radiation and which have in association therewith, respectively, non-ditfusible bleachable cyan, magenta and yellow dyes, said light-sensitive layers having incorporated therein a dye-bleach catalyst, and at least two separate, non-light-sensitive hydrophilic colloid layers containing a developing agent free from any dye moiety, said layers being arranged so that each of said light-sensitive layers is contiguous to at least one of said hydrophilic colloid layers.
• a photographic element suitable for providing multicolor images comprising a support having coated thereon three separate light-sensitive silver halide emulsion layers sensitized, respectively, to red, green and blue radiation, said layers containing, respectively, non-ditfusible bleachable cyan, magenta and yellow dyes, each of said layers containing an efiective concentration of a quinoxaline dye-bleach catalyst, said element also containing two separate hydrophilic colloid layers, the layers of said element being arranged so that each light-sensitive layer is contiguous to at least one of said hydrophilic colloid layers, each of said hydrophilic colloid layers having incorporated therein an effective concentration of norbornane hydroquinone and 1-phenyl-3-pyrazolidone developing agents to provide a negative silver image in at least one of said light-sensitive layers upon exposure and activation at a pH of about 10.5 with an alkaline solution.
• a photographic element suitable for providing multicolor images comprising a support having coated thereon three separate light-sensitive silver halide emulsion layers sensitized, respectively, to red, green and blue radiation, said layers containing, respectively, non-diifnsible bleachable cyan, magenta and yellow dyes, each of said layers containing an eflective concentration of a dye bleach catalyst, said element also containing two separate hydrophilic colloid layers, the layers of said element being arranged so that each light-sensitive layer is contiguous to at least one of said hydrophilic colloid layers, each of said hydrophilic colloid layers having incorporated therein an effective concentration of a hydroquinone and a 3-pyrazolidone developing agent to provide a negative silver image in at least one of said light-sensitive layers upon exposure and activation at a pH of about 10.5 with an alkaline solution.
• a photographic element suitable for providing multicolor images comprising a support having coated thereon three separate light-sensitive silver halide emulsion layers sensitized, respectively, to red, green and blue radiation, saidlayers containing, respectively, non-diffusible bleachable cyan, magenta and yellow dyes, each of said layers containing an effective concentration of a quinoxaline dye bleach catalyst, said element also containing two separate hydrophilic colloid layers, the layers of said element being arranged so that each light-sensitive layer is contiguous to at least one of said hydrophilic colloicl layers, each of said hydrophilic colloid layers having incorporated therein an effective concentration of a hydroquinone and a 3-pyrazolidone developing agent to provide a negative silver image in at least one of said light-sensitive layers upon exposure and activation at a pH of about 10.5 with an alkaline solution.

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• 1965
  • 1965-08-20 US US481406A patent/US3498787A/en not_active Expired - Lifetime
• 1966
  • 1966-08-04 DE DE19661547720 patent/DE1547720A1/de active Pending
  • 1966-08-11 BE BE685423D patent/BE685423A/xx unknown
  • 1966-08-18 CH CH1191566A patent/CH470694A/fr not_active IP Right Cessation
  • 1966-08-19 GB GB37233/66A patent/GB1161424A/en not_active Expired
  • 1966-08-19 GB GB06535/69A patent/GB1162970A/en not_active Expired

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