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
  • G03C7/02—Direct bleach-out processes; Materials therefor; Preparing or processing such materials

Definitions

• Our present invention relates to sensitizing colloid layers containing bleaching-out dyes.
• One of its objects is to incorporate the sensitizer in the finished bleaching-out dye layer.
• an organic sensitizer for instance, thiosinamine
• the sensitizer may occur in various manners. For instance, a solution of the sensitizer may be applied to the colloid layer consisting, for instance, of gelatin or a cellulose derivative and containing the bleaching-out dyes, by
• the solution means of rollers wetted with the solution in any suitable manner, or the solution may be applied by spraying the bleaching-out layer either with the solution itself or with the solution in admixture with a colloid.
• the sensitizer may be applied to the layer in the form of vapour in which case, the vapour of sensitizer may be produced in a closed vessel in the presence or absence of other volatile substances, if required under a reduced pressure and while heating.
• the sensitizer may diffuse from a suitable carrier into a bleachingout layer.
• the diffusion occurs without aid or is helped by gentle heating (ironing) or by moistening.
• a carrier for the sensitizer there may be used paper or a colloid layer (a sheet of gelatin, regenerated cellulose, cellulose esters, cellulose ethers, etc).
• the carrier is impregnated with a solution of the sensitizer, or the sensitizer is incorporated in the carrier already during its manufacture, by adding it, for instance, to the gelatin solution or the solution of a cellulose derivative before being poured on the support to form a sheet.
• Such a colloid layer containing the sensitizer may if desired be applied to any suitable base.
• the colloid layer provided with the sensitizer is brought into contact with the bleaching-out layer the sensitizer diffuses into the bleaching-out layer under the conditions above mentioned.
• thepressed-on carrier for the sensitizer can be detached, or if it consists of a transparent material, it may remain on the bleaching-out layer during the printing process.
• the process according to this invention may also be used for the manufacture of sensitized bleaching-out layers on a commercial scale by first preparing non-sensitized layers which are stored in this state. correspondingly with demand of sale, the stored non-sensitized layers are provided in known manner by any of the usual coating machines or by means of a spraying device with the colloid coating. (gelatin or a cellue lose derivative), which contains the quantity required of sensitizer. 85
• Example 1 Diethylallylthiourea and twice its weight of alcohol are evaporated in a closed otherwise evacuated chamber, preferably by gently heating, in thepresence of a bleaching-out layer, for instance, a colloid layer consisting of 30 per cent of collodion and '10 per cent of ethylbenzylcellulose containing bleaching-out dyes and applied to a paper support.
• a bleaching-out layer for instance, a colloid layer consisting of 30 per cent of collodion and '10 per cent of ethylbenzylcellulose containing bleaching-out dyes and applied to a paper support.
• the bleaching-out layers are left therein (for about 10 minutes), un til the degree of sensitizing desired is attained.
• Example 2 A solution of 0.8 gram of nitrocellulose and 1.0 gram of pyperidylallylthlourea in 75 cc. of a mixture of 1 part of alcohol and 3 parts of ether is poured on 800 square centimeters of Cellophane (registered trade-mark) or pergamyn. The sheet is pressed on a non-sensitized bleaching-out layer as indicated in Example 1 be-. tween heated rollers or by means of a-fiatiron. After a short time the sensitizer is uniformly distributed in the bleaching-out layer and the sensitizing sheet, whereupon the latter is detached from the bleaching-out layer;
• Example 3 A solution of 5 grams of allylthiourea, 100 cc. of water and 8 grams of gelatin is poured so as to form a layer 10 a thick onto a bleaching-outlayer comprising gelatin as binding agent.
• Example 4 A solution consisting of 2 grams of dimethylallylthiourea, 1.5 gram of ethylbenzylcellulose, 0.5 gram of nitrocellulose, 20 cc. of ether, 40 cc. of alcohol and 40 cc. of benzene is sprayed onto a bleaching-out layer according to Example 1 by means of a spraying gun. After drying the bleaching-out layer is ready for use.
• the step which comprises incorporating the sensitizer in the finished bleaching-out layer by applying to the bleaching-out layer a colloid layer containing the sensitizer.
• sensitizing finished bleaching-out layers which comprises bringing a bleaching-out layer into contact with a colloid layer 4.
• the step which comprises pouring a. solution of colloid and sensitizer onto a non-sensitized bleaching-out layer.
• step ' which comprises pouring a solution of ellylthiourea' and gelatin in water on to a non-sensitized bleaching-out layer comprising gelatin as binding agent.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Laminated Bodies (AREA)
• Medicinal Preparation (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6371307

Family Applications (1)

Country Status (4)

Cited By (41)

• 0
  • BE BE390157D patent/BE390157A/xx unknown
• 1932
  • 1932-08-01 US US627220A patent/US1955898A/en not_active Expired - Lifetime
  • 1932-08-01 FR FR740645D patent/FR740645A/fr not_active Expired
  • 1932-08-04 GB GB21905/32A patent/GB388670A/en not_active Expired

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