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
  • G03C1/00—Photosensitive materials
  • G03C1/52—Compositions containing diazo compounds as photosensitive substances
  • G03C1/62—Metal compounds reducible to metal
• • 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
  • G03C1/00—Photosensitive materials
  • G03C1/52—Compositions containing diazo compounds as photosensitive substances
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
  • G03D7/00—Gas processing apparatus

Definitions

• the present invention relates to photographic material and to the method of producing same, and more particularly to photographic material which has the property of self-coloring.
• a paper carrier is soaked in a solution comprising, for instance, a diazonium compound and an azocomponent, and the so-treated carrier is subsequently subjected to intensive drying to give it a sufiicient stability, which stability is further increased by adding to the carrier, substances having an acid reaction. Also this layer after being exposed is developed with an alkali.
• self-coloring property as used herein, is to be understood to mean, the property of a light-sensitive material which enables development of the image to be effected after the exposure merely by the action of water vapor or steam, and whereby an intensive color formation takes place on the unexposed portions and little or no color formation takes place at the strongly exposed portions, and fixation of the image is achieved without the subsequent addition or removal of any substance.
• the speed of such self-coloring can be increased by moderate heating.
• dyestuffcomponent as used here-' can either couple with the diazonium compound to form a so-called azo-dyestufl, or can be oxidized by a diazonium compound to form a colored compound.
• the dyestuir component may be provided as such in or on the carrier, or may be formed there from another compound, for instance by the photo-chemical decomposition of a diazonium compound.
• diazonium compounds may be mentioned, diazonium salts, so-called diazo-oxides, internal diazonium salts, diazo-sulphonates, or the group of substances which have often been classified as diazo anhydrides.
• such combinations of a diazonium compound and of a dyestuif-component may be selected which have such a speed of dyestufi formation that the lightsensitive layer becomes, without further means, self-coloring.
• a carrier for instance paper
• a carrier for instance paper
• a solution of a diazonium compound whereupon it is dried and subsequently rubbed in with powdery dyestuif-component.
• the powder may be mixed with a suitable amount of a material causing an alkaline reaction.
• the layer after it has been impregnated with a diazonium compounT and subsequently dried, with a non-aqueous solution of a dyestuflE-component, whereupon the solvent is rapidly vaporized.
• a fine powder of a material causing alkaline reaction may subsequently also be applied in this case.
• a carrier may be provided with a powdery diazonium compound and a powdery dyestufi-component, which are either applied separately or in a mixed condition.
• a lightsensitive layer may be obtained by treating the carrier with a non-aqueous solution of a diazonium compound and of a dyestuff-component. either individually or with a mixture of the two; provision being made for a rapid evaporation of the solvent.
• the sensitized layers are prepared according to the invention, they are preferably stored prior to their use in an airtight and dry space, as otherwise prolonged exposure to atmosphere may cause some formation of dyestui! due to the action of the water vapor present in the atmosphere.
• the carrier may be previously dried, for instance, by means of an intensively dried air, which may be obtained by drying air for an extended time interval by means of phosphorus pentoxide or by freezing the moisture out of the air.
• the light-sensitive layer When using combinations which readily oxidize in the air, it may be advantageous to provide the light-sensitive layer with anti-oxidizing agents.
• the light-decomposition products thus formed often have a much higher speed of forming a colored compound with a diazonium compound than does the hydroxy compound corresponding to this diazonium compound, and which hydroxy compound may be formed by hydrolysis and subsequent evolution of nitrogen by thermal means from the diazonium compound.
• the light decomposition products lose their high activity and form coloring matter with the diazonium compound, and at about the same speed as does the hydroxycompound.
• the higher ac-'- tivity i. e., speed of color formation of the light decomposition products, can be stabilized by preserving the carrier containing these decomposition products in an atmosphere having a sufficiently high degree of dryness.
• a carrier provided with a diazonium compound is intensively dried until the required degree of dryness has been attained, and then exposed in such a manner that part of the diazonium compound present is photochemically decomposed.
• the sensitized material thus obtained, when stored in a condition and in a space having the required degree of dryness, gives no formation of dyestuff and the abovementioned characteristic high activity of the light-decomposition product formed is stabilized. If this sensitized material were brought, after a preliminary exposure used for the formation of light decomposition product, into an atmosphere having a suillciently high water vapour content, the dyestuff would immediately be formed, whereby the sensitized material would be spoiled. Consequently the sensitized material should be exposed to the action of water vapor only after a second exposure to light, which exposure serves for the formation of the image.
• the preliminary exposure by means of which the light-decomposition product is formed evenly in the sensitized layer, should preferably decompose such a quantity of the total amount of the diazonium compound that the light-decomposition product and the non-decomposed diazonium compound will yield a maximum formation of dyestufi.
• the extent of such preliminary exposure can be experimentally determined by plotting a blackening (coloring) curve corresponding to diflerent exposure times and/0r intensities of the layer comprising a diazonium compound, and determining therefrom those conditions of the preliminary exposure which yield the strongest blackening.
• Example I Paper is coated with a. 1% solution of the zincchloride double salt of p-diphenylaminodiazoniumchloride. whereupon it is dried in air and is subsequently rubbed with a very fine powder consisting of 0.5 gram of R-salt (sodium salt of 2 hydroxy naphthalene 3.6-disulphonic acid) and 0.175 gram of anhydrous sodium carbonate,
• R-salt sodium salt of 2 hydroxy naphthalene 3.6-disulphonic acid
• the sensitized material thus obtained gives after exposure and subsequent treatment with steam, a positive image having a dark violet color.
• Example 11 Paper is treated with a 1% solution of the zincchloride double salt of p-diphenylaminodiazoniumchlorlde, whereupon it is dried in air and subsequently dusted with a very fine powder of phloroglucin. After exposure under a tracing. treatment at room temperature in an atmosphere of water vapor gives, after a few hours, a finished violet black positive image. By using warm water vapor the image forms in about minute.
• Example III Paper is coated with a 1% solution of the zinc chloride double-salt of p-diphenylumchlorlde, whereupon it is dried in air, and subsequently rubbed with a powder consisting of a-naphthol.
• a brown black colored positive image can be immediately produced by treatment with water vapor having a temperature oi about C., and the finished print is thereby obtained.
• Example IV Paper is coated with a 1% solution of l-diazonium-2-hydroxy-naphthalene-4-sulphonic acid, whereupon it is air-dried and then a homogeneously mixed fine powder consisting of equal parts of resorcin and anhydrous sodium carbonate is rubbed on the sensitized side of the paper. After exposing the material under a tracing and subsequently bringing it into an atmosphere containing water vapor, a reddish purple image is obtained giving a finished print.
• Example V Paper is soaked with a 2% alcoholic solution of naphthol, whereupon 'it is dried in the air, and subsequently painted with a powder of the zinc chloride double salt of p.diphenylaminodiazoniumchloride. After exposure under a tracing for 3 minutes, followed by a treatment of short duration with a very thin layer of water or with steam, a black brown positive image results.
• Example VI Paper is rubbed with a fine powder consisting of 1.00 gram of zinc chloride double salt of p-diphenylaminodiazoniumchloride and 0.30 gram of phloroglucin. After exposure under a tracing and treatment with hot water vapor a greenish black positive image results.
• Example VII Paper is treated on one side with a 2% solution of 2-diazonium-l-hydroxybenzene 4 sulphonic acid and 5.3% of Cu(NO3)26I-I2O in water and subsequently very intensively dried by means of a current of gas free from water vapor.
• the material is subjected to a preliminary exposure for 5 seconds and at a distance of 25 centimeters to the light of a 5 kw. incandescent lamp or for a corresponding time to the light of a mercury discharge tube.
• a blue positive image is immediately formed after the sensitized material thus obtained, has been exposed under a tracing for about 2 minutes at a distance of 25 centimeters from a- 5 kw. incandescent lamp and has been treated with warm water vapor.
• Example VIII Paper is treated with a 1.9% solution of a 2-di azonium-lhydroxy 5 methylbenezne 4 sulphonic acid and 5% CU.(NO3)26H2O in water and is subsequently treated in accordance with Exampie VII.
• Example IX Paper is treated with a 2% aqueous solution of 2-diazonium-l-hydroxybenzene 4 sulphonic acid and 5.3% Cu(NOa)26H2O and is then dried in a current of gas free from water vapor. In this condition the material is exposed till the diazonium compound is entirely copied out. Thereupon the so-treated paper is rubbed, in a practically perfectly dry atmosphere, with a fine powder of 1-hydroxy-5-methyl-2-diazoniumbenzene-4-sulphonic acid. After exposure under a tracing and subsequent treatment with water vapor, a steel blue positive image results.
• Example X Paper is soaked with a 2% solution of e-naphthalene diazoniumchloride, is dried, and is subsequently exposed to light, due to which the diazonium compound is completely copied out.
• the layer is covered with a powder of p diphenylaminodiazoniumchloride. After being exposed under a tracing, followed by treatment with steam, a black brown positive image results.
• the process which comprises, applying to a carrier a diazonium compound, drying the carrier, photochemically decomposing the diazonium compound to form a dyestufi component, apply- .ing to the so-treated carrier a powdery diazonium compound component capable of reacting with said dyestufi component in the presence of moisture to form a dyestuff, maintaining during the application of the diazonium component and subsequent thereto a degree of dryness suflicient to

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Paper (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=19750240

Family Applications (1)

Country Status (5)

Cited By (6)

• 0
  • NL NL45176D patent/NL45176C/xx active
  • BE BE407019D patent/BE407019A/xx unknown
• 1934
  • 1934-11-09 GB GB32298/34A patent/GB443611A/en not_active Expired
  • 1934-12-19 US US758334A patent/US2311016A/en not_active Expired - Lifetime
  • 1934-12-27 FR FR783374D patent/FR783374A/fr not_active Expired

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