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
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/3029—Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function

Definitions

• ABSTRACT Light-sensitive multicolor recording paper for oscillograph traces, having on a support, an undercoat of green-sensitive gelatin-silver bromoiodide emulsion in which the iodine amounts to 0.2-2.0 mol percent of the silver and containing a magenta color former, a gelatin interlayer, an overlying blue-sensitive gelatin-silver bromoiodide emulsion in which the iodine is 4-12 mol percent of the silver content and containing cyan color former, and a gelatin surface coating.
• yellow and magenta filters of different density for the exposing light and subjecting the material to color development at least three different color traces can be produced.
• COILOli OSCHlLlLOGRAPllll RECORDING lPAlPElR This invention relates, in general, to color oscillograph recording materials and, in particular, to photosensitive recording paper which finds immediate and practical utility for recording oscillograph traces in at least three colors.
• Photosensitive papers adapted for light recording, for example, oscillograph recording are known. Such materials are both of the printout type and the developing-out type.
• the printout type of material requires no development step and may or may not be fixed. Such materials are generally much slower than the materials used in developing-out processes and have poor image permanency.
• the developing-out type as the name implies, requires that the exposed material be chemically developed, fixed and washed in order to provide a stable visible image on said material. It is this second type of printing material with which the present invention is concerned.
• Another object of this invention is to provide a simplified system of processing such papers for development employing a minimum number ofsolutions.
• a further object of this invention resides in the provision of a color system which closely approximates the handling procedures used with conventional black and white oscillograph papers.
• Still another object is a procedure which does not require a bleach step to remove image silver as required in conventional color systems.
• a photographic material comprising, (a) a flexible support bearing on at least one surface thereof, (b) an undercoat, (c) a separating layer comprising hardened gelatin, (d) an outer coating and, (e) a hardened gelatin surface layer.
• the flexible support is usually photographic paper" or recording paper, which terms are used throughout the specification and claims to include photosensitive emulsions in any suitable support such as paper, film or other usable medium. ltis preferred, however, to employ a paper such as 45-90 grams/square meter Document Paper (100 percent rag) without baryta coat or other surface or a paper similar thereto.
• the undercoat layer comprises a silver bromoiodide emulsion which before optical sensitization has a low sensitivity to light having a wavelength of 480 microns and above.
• This undercoat layer has an iodide content of from about 0.2 to 2.0 mole percent, based on the amount of silver present in the emulsion.
• This undercoat is optically sensitized to the green region of the spectrum and contains a colorless color former, fast to diffusion, capable of reacting with the oxidation products of an aromatic p-amino developing agent to form a magenta dye image.
• the outer coating comprises a silver bromoiodide emulsion layer having a high sensitivity to light in the 400-510 micron range when devoid of any optical sensitizing dye.
• the bromoiodide content of this outer layer ranges from about 4.0
• This layer contains a color former capable of forming a cyan dye image upon color development.
• a color former capable of forming a cyan dye image upon color development.
• the invention contemplates conventional photographic recording techniques in exposing the photosensitive emulsions to light in a oscillograph recorder.
• the recorder is necessarily provided with suitable colored filters in front of galvanometers used in conjunction therewith.
• the conventional photographic recording techniques generally referred to as oscillography, involves the exposure of an entire roll of a record paper to the information to be recorded with subsequent and separate chemical development of the roll thus exposed. ln this procedure a record roll of approximately 250-400 feet in length is entirely exposed before its removal from the oscillographic recorder and its subsequent development by conventional means.
• the color formers employed herein are those which are well known in the photographic art.
• the term color former is used throughout the specification and claims to define an essentially colorless compound fast to diffusion which is capable of reacting with the oxidation products of an aromatic p-amino developing agent, particularly of the N,Ndisubstituted p-phenylenediamine series as exemplified by N,N-diethylamino aniline, hydroxyethyl)-aniline and the like, to produce dyes of the azomethine, quinoneimine, indoaniline and phenazine (azine) series.
• aromatic p-amino developing agent particularly of the N,Ndisubstituted p-phenylenediamine series as exemplified by N,N-diethylamino aniline, hydroxyethyl)-aniline and the like.
• Such color formers are well known to persons skilled in the art and described in the patent literature, for instance in US.
• color formers which are usable in accordance with this invention are compounds such as: l-octadecyl-Z-(Z ',l'-hydroxynaphthyl)-benzimidazole-5-sulfonic acid as a cyan color former; l-(4-phenoxy-3'sulphophenyl)-3-stearyl- S-pyrazole as a magenta color former; and 2-(4'-benzolylacetoaminophenyl)-1-octadecylbenzimidazole5-sulfonic acid as a yellow color former.
• the quantity of color former used per unit of silver halide is selected in such a way that sufficient density of the trace is achieved upon exposure and developing so as to provide proper readout. Specifically, it is recommended that the ratio of color former to silver halide per silver halide emulsion layer be about 10 millimole ofcolor former to about 2 to 20 grams of silver halide.
• the invention contemplates the use of a sensitizing dye capable of sensitizing in the green region of the spectrum. If desired, the blue sensitivity of the blue sensitive layer can be further increased by the use of a sensitizing dye for the blue. It is preferred that these dyes should be nonmigratory in the emulsion in which they are present so that the dyes cannot wander freely from layer to layer.
• sensitizing dyes usable herein are the various cyanine. carbocyanine, merocyanine, styryl and related sensitizing dyes which are well known to persons skilled in the art.
• the emulsions may contain the usual coating finals such as those proposed to retard or prevent fog in light-sensitive silver halide emulsions. These compounds are commonly referred to as antifoggants or stabilizers and are, in many instances, heterocyclic compounds with a plurality of nitrogen atoms or with a mercapto group in their molecule.
• Certain other adjuvants normally incorporated into silver halide photographic emulsions such as wetting agents, may also be employed.
• aqueous gelatin dispersions and gelatin silver halide emulsions employed herein with a hardening agent in order to reduce the tendency of the layers to soften, melt or reticulate during processing, particularly at temperatures which are higher than the temperature of 68 F. (20 C.) previously specified for the processing of photographic materials.
• a hardening agent in order to reduce the tendency of the layers to soften, melt or reticulate during processing, particularly at temperatures which are higher than the temperature of 68 F. (20 C.) previously specified for the processing of photographic materials.
• Compounds which have been used for the hardening of gelatin and gelatin emulsion layers include formaldehyde, hydroxyaldehyde's, glyoxal and its derivatives, triacrylformal, as well as mixtures of such aliphatic aldehydes with an aromatic hydroxy compound such as phenol, or resorcylic aldehyde.
• Other conventional hardeners also applicable include alum, chromalum
• Suitable supports for the novel silver halide emulsions and elements of this invention include the flexible supports used in the prior art for oscillographic recordings. These supports may be transparent but, in general, a photographic grade flexible paper is selected. In this regard, 55 g./m. of Document Paper (100 percent rag) without a baryta coating or other surface coating is especially preferred. However, there can be used any other flexible material suitable for coating with a photographic colloid silver halide emulsion.
• EXAMPLE I An improved recording paper was prepared by adding to 1,000 grams of a low blue sensitive bromoiodide emulsion containing 1.8 mole percent iodide the following ingredients: 165 cc. of a 122,000 solution containing a sensitizing dye for the green; 7 cc. ofa 2 percent solution ofa triazaindolzinc antifoggant; 60 cc. ofa 10 percent solution of an ammonium salt of a sulfate ester of an alkyl phenoxypolyoxyethylene ethanol which serves as a coating aid; 25 cc. of a 6 percent solution of a triacrylformal hardener; 25 cc. ofa 0.2 percent solution ofa tetrazaindene restrainer and 20 grams of a magenta color former having the formula:
• the coated material with the two silver halide layers was exposed using a commercially available oscillograph (manufactured by the Midwestern Instruments Corp.) employing a tungsten light source (2,850 K.) under the following conditions:
• the lamp voltage was set at 12 volts and paper travel rate was adjusted at 25 inches/second.
• the resulting exposed material was then placed in a standard automatic oscillogram processor as manufactured by Consolidated Electrodynamics Corp.. and processed at a rate of about 6 feet/minute for a contact time of about 20 seconds in each tank.
• processor apparatus 4 tanks were utilized, each being maintained at a temperature of about l00 F., with the following tank arrangement as to contents:
• FIXER Ingredient Amount HYPO sodium thiosullate, 1300 grams anhydrous Water up to l liter
• the resulting processed paper showed five distinct and separate traces, namely, magenta, cyan, purple, deep blue and dark magenta.
• the magenta trace was produced by the light from galvanometer A which was fitted with the yellow filter.
• the cyan trace was produced by the light from galvanometer B which was fitted with the magenta filter.
• the purple trace was produced by the light from galvanometer C which was fitted with a yellow color-correction filter, the deep blue trace by the light from galvanometer D, which was fitted with a magenta filter and the dark magenta trace was produced by the light from galvanometer E which was fitted with a yellow color-correction filter.
• the filters selected to produce the various desired colored trace lines are determined by the speed of the sensitive material as related to the light source intensity and the color temperature.
• the above filters were selected for use with a tungsten light source.
• other filters may be needed especially to balance the so-called white light trace.
• Nonlimiting examples of the filters which may be suitably employed are as follows:
• the processing technique employed offers several advantages.
• the availability of two developer and fixer tanks makes it possible to extend not only the developing time and fixing time but also the useful life of the processing solutions.
• the omission of the bleaching step results in color pictures which contain a warm tone silver deposit.
• the presence of the silver deposit makes it possible to reproduce the oscillograph recording on diazo-type materials.
• a multicolor recording paper for recording oscillograph traces in at least three colors which comprises (a) a flexible support bearing on at least one surface thereof, in the following order: (b) an undercoat of a hardened silver bromoiodide emulsion, having a low sensitivity to light having a wavelength of 480 microns and above, and being optically sensitized to the green and containing a color former capable of forming a magenta dye image upon color development, said emulsion having an iodide content ranging from 0.2 to 2.0 mole percent based on the amount of silver present, (c) a hardened gelatin intersurface layer, (d) a hardened silver bromoiodide outer emulsion coating which is blue sensitive in the wavelength region ranging from 400 to 510 microns and containing a color former capable of forming a cyan dye image upon color development, the iodide content of said upper emulsion ranging from 4.0 to 12 mole percent based on the amount of silver present, and (b)
• magenta color former has the formula:
• a process of forming a multicolored image which comprises exposing with a plurality of selectively filtered colored lights, a multicolor recording paper for recording oscillograph traces in at least three colors which comprises, (a) a flexible support bearing on at least one surface thereof in the following order: (b) a hardened silver bromoiodide emulsion, having a low sensitivity to light having a wavelength of 480 microns and above, and being optically sensitized to the green and containing a color former capable of forming a magenta dye image upon color development, said emulsion having an iodide content ranging from 0.2 to 2.0 mole percent based on the amount of silver present in the emulsion, (c) a hardened gelatin intersurface layer, (d) a hardened silver bromoiodide emulsion coating which is blue sensitive in the wavelength region ranging from 400 to 510 microns and containing a color former capable of forming a cyan dye image upon color development, the iodide content of

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Medicines Containing Plant Substances (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24173698

Family Applications (1)

Country Status (5)

Cited By (1)

• 1966
  • 1966-04-25 US US544812A patent/US3615424A/en not_active Expired - Lifetime
• 1967
  • 1967-04-21 DE DE19671547924 patent/DE1547924A1/de active Pending
  • 1967-04-21 DE DEG36989U patent/DE1968938U/de not_active Expired
  • 1967-04-24 GB GB08765/67A patent/GB1185669A/en not_active Expired
  • 1967-04-24 NL NL6705759A patent/NL6705759A/xx unknown
  • 1967-04-24 BE BE697443D patent/BE697443A/xx unknown

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