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
  • G03C1/60—Compositions containing diazo compounds as photosensitive substances with macromolecular additives

Definitions

• This invention relates to the stabilization of photo-printing materials having light sensitive layers which are produced by the incorporation of a diazo compound as the light-sensitive medium onto the surface of a suitable carrier base. More particularly, it refers to the stabilization of so-called dry-development diazotype light-sensitive layers wherein the diazo compound is incorporated into the light sensitive layer together with an azo dyestufi coupling component.
• diazo compounds for such dry-development or two-component diazotype light-sensitive layers the most suitable have been found to be those which are derived from orthoor para-aminonaphthols or aromatic paradiamines, particularly N-monoor di-substituted aromatic paradiamines.
• Various processes are known for the preparation of light-sensitive layers which depend upon the use of a diazo compound as the light-sensitive medium, and various materials have been employed for the carrier of the light-sensitive layer, including textiles, paper, cellulosic films, and glass and metal surfaces.
• the sensitized carrier is exposed to light under a transparent original which it is desired to reproduce and the diazo compound is decomposed in the areas unprotected by the outline of the original.
• the undecomposed diazo compound in the protected areas is then used to develop'the image of the original by coupling the said diazo compound in an alkaline atmosphere with an azo dyestuff coupling component.
• the development of the dyestuff forming the image is effected by bringing the exposed light-sensitive layer into contact with gaseous ammonia. This is known as the dry developing process.
• the dyestuif components, as applied on the carrier are relatively unstable and cannot be stored for long periods prior to use.
• the lightsensitive layers which carry the coupling component as well as the diazo compound in the light-sensitive layer are subject to premature coupling of the said dyestuif components as well as decomposition of the diazo compound upon long storage.
• coating solutions and the light-sensitive layers prepared therefrom can be l5 ortho-hydroxy-carboxylic acids of the benzene or naphthalene series. 7
• Diazotype light-sensitive layers which have been stabilized by addition of compounds of the above classshow greatly improved keeping qualities and are stable against decomposition or deterioration for much longer periods of storage than hitherto possible when using the same diazo light-sensitive compositions without these sta-
• the following examples illustratethe invention but they are not intended to limit it thereto. The parts are by weight unless otherwise stated.
• Example 1 A coating solution (A) was made up as follows:
• Another coating solution (B) was made up containing the same ingredients as in (A) except that parts citric acid and 44 parts 5-sulio-salicylic acid were substituted for the 100 parts of citric acid. These solutions were then separately spread on strips 59' of paper, fabric, and film by the usual coating,
• Example 2 The composition of the coating solutions A and B was the same as in Example 1, but as a stabilizer 47 parts 5-sulfo-o-cresotic acid per liter were used instead of the 5-sulfo-salicylic acid.
• the coatings of A and B and the storage and test ing procedures were the same as in Example 1.
• the stability of the coating. made according to this example was found to be superior to that of the coating made from a solution not containacid in the ing 5-sulfo-o-cresotic acid as a stabilizer.
• Example 3 The composition of the coating solutions A and B was the same as in Example 1, but as a stabilizer 53.5 parts of 8-sulfo-2-hydroxy-3-naphthalene-carboxylic acid per liter were used instead of the 5-sulfo-salicylic acid.
• Example 1 The stability of the coating made according to this example was found to be superior to that of the coating made from solution A not containing ,8-sulfo 2 hydroxy-3-naphthalene-carboxylic acid as a stabilizer.
• Example 4 A coating solution was made up as follows:
• solution A Sodium salt of the naphthalene-1,3,6-trisulfonic acid Aluminum sulfate were d ssolved in 1000 cc. of water (solution A)
• Another coating solution (B) was made up containing the same ingredients as in solution (A). except that ,50 parts citric acid and 44 parts of 5-sulfo-salicylic acid were substituted for the 100 partsiof citric acid. Solutions A and B were then separately spread on strips of paper, fabric, and film by the usual coating method in the same manner as described in Example 1.
• the lightsensitive layer thus produced was then stored at room temperature for several months and its stability then tested by observing the appearance of color in the light-sensitive layer due to premature coupling of the dye components and by comparison of its light-sensitive qualities with those of a testsample prepared and treated in the same manner as the light-sensitive layer of this example. but omitting the 5-sulfo-salicylic acid as a stabilizer. When so tested, it was found that the light-sensitive layer made in accordance with light-sensitive layers.
• this example shows no discoloration due to premature coupling of the dye components after the storage period, whereas, the light-sensitive layer not having the 5-sulfo-salicylic acid as a stabilizing agent, under the same conditions, shows a' considerable amount of coloring, due to premav ture coupling.
• Example 5 A coating solution was made up as follows:
• Example 7 A coating solution was made up as follows:
• Example 8 lene carboxylic acid per liter were used instead of the 5-sulfo-o-cresotic acid.
• the coating, storage and testing procedures are the same as in Example 1.
• the stability of the coating made according to this example was found to be superior to that of the coating made from solution A not containing 6-sulfo-2-hydroxy 3 naphthalenecarboxylic acid as a stabilizer.
• Photoprinting materials comprising light sensitive layers on a suitable base containing in the light-sensitive layer a diazo compound suitable for forming a stable two-component diazotype layer, an azo dye coupling component and a member of the class consisting of sulfonated ortho-hydroxy-carboxylic acids of the benzene and naphthalene series.
• Photoprinting materials comprising lightsensitive layers on a suitable base containing in the light-sensitive layer a diazo compound derived from an aromatic paradiaminean azo dye coupling component and a member of the class consisting of sulfonated ortho-hydroxy-carboxylic acids of the benzene and naphthalene series.
• Photoprinting materials comprising lightsensitive layers on a suitable base containing in the light-sensitive layer a diazo compound derived from an ortho-aminonaphthol compound, an azo dye coupling component and a member of 6 the class consisting of sulfonated ortho-hydroxycarboxylic acids of the benzene and naphthalene series.
• Photoprinting materials comprising lightsensitive layers on a suitable base containing in the light-sensitive layer a diazo compound derived from an aromatic paradiamine, an azo dye coupling component and 5-sulfo-salicylic acid.
• Photoprinting materials comprising lightsensitive layers on a suitable base containing in the light sensitive layer a diazo compound derived from an aromatic paradiamine, an azo dye coupling component and 8-sulfo-2-hydroxy-3- naphthalene-carboxylic acid.
• Photoprinting materials comprising lightsensitive layers on a suitable base containing in the light-sensitive layer, a diazo compound derived from an ortho-aminonaphthol compound, an azo dye coupling component and 5-su1fo-ocresotic acid.

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• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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Cited By (7)

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Citations (3)

• 1945
  • 1945-01-04 US US571352A patent/US2416773A/en not_active Expired - Lifetime
• 1946
  • 1946-10-01 GB GB29263/46A patent/GB617451A/en not_active Expired
  • 1946-11-14 CH CH265220D patent/CH265220A/fr unknown
  • 1946-11-26 FR FR938841D patent/FR938841A/fr not_active Expired
• 1949
  • 1949-03-01 DE DEP29350A patent/DE869007C/de not_active Expired

Patent Citations (3)

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