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
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
  • G03C5/29—Development processes or agents therefor
  • G03C5/31—Regeneration; Replenishers

Definitions

• the present invention relates to diaaotype photographic printing papers.
• Papers of this kind only require for their development a ,treatmentwith alkalis, for m example ammonia or soda solution. It has also been proposed to apply the alkali serving for the development alone or in admixture with an azo component on papers sensitised with diazo compounds before the exposure, the said alkali and/or azo component being applied in powder form. Papers of this kind can be developed by a simple treatment with water or steam respectively. They possess, however, only very poor keeping qualities. Moreover, they have the disadvantage that when in use they easily become dusty, i. e. give oil fineparticles of the alkali and/or the 2.20 component, which gives rise t6 considerable inconvenience to the operator carrying out the work of printing.
• One object of the present invention is the production of light sensitive materials to be developed by treatment with water which materials have better keeping qualities than the known materials of this kind.
• Another object of the invention is the production or light sensitive materials oi the mentioned type which do not tend to give off line particles or the substances which have been applied in powder form.
• light sensitive diazotype materials which contain as developing means a coupling component and a neutral salt of a weak base with a weak acid which latter is fugitive with steam, i. e. can be volatilized by means of steam below its normal boiling point.
• a coupling component and a neutral salt of a weak base with a weak acid which latter is fugitive with steam, i. e. can be volatilized by means of steam below its normal boiling point.
• Such salts are the acetates and iormates of zinc, cadmium andlead.
• diazo compounds advantageously such which couple rapidly, i. e. couple under neutral or acid conditions areused.
• Paper is sensitized with a solution contain- -ing 9b grfams'oi the diazo compound of l-aznino l-benzoylarnino-2,5-diethoxybenaene, d5 grams of citric acid and 3 litres or water and has rubbed into it by mechanical means an intimately mixed powder consisting of 125 grams or phlorogluciue and 250 grams or also acetate. if desired, both in this case and in Exainple l, inert substances, such as starch, may be added for diluting the powder.
• the alter-treatment of the paper is carried out as described in Example 1. In place of the zinc acetate also the corresponding formic acidsalt may be employed.
• Paper is sensitized with a solution containing 15 grams of the diazo compound of 1- phenylthioacetylamino lfi-dimethoxy 4 aminobenzene, 5 grams of citric acid, 5 grams of boric acid; 5 grams of aluminium sulphate and 1 litre of water and has rubbed into it a mixture of 60 grams of phloroglucine, 200 grams of cadmium acetate and 120 grams of Glauberslsalt.
• the diazo compound of 1- phenylthioacetylamino lfi-dimethoxy 4 aminobenzene 5 grams of citric acid, 5 grams of boric acid; 5 grams of aluminium sulphate and 1 litre of water and has rubbed into it a mixture of 60 grams of phloroglucine, 200 grams of cadmium acetate and 120 grams of Glauberslsalt.
• a light-sensitive material which comprises a diazo compound and developing means which comprise a coupling component and a neutral reacting salt of a weak base with a weak acid selected from the group consisting of the acetates and formates of lead, zinc, and cadmium, the material being free from dust.
• a light-sensitive material which comprises a diazo compound and developing means which comprise a coupling component and zinc formate, the material being free from dust.
• a light-sensitive material which comprises a rapidly coupling diazo compound and developing means which comprise a coupling component and a neutral reacting salt of a weak base with a weak acid selected from the group consisting of the acetates and formates of lead, zinc, and cadmium, the material being free from dust.
• a light-sensitive material which comprises a diazo compound and developing means which comprise a coupling component and zinc acetate, the material being free from dust.

Landscapes

• Physics & Mathematics (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)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6540681

Family Applications (1)

Country Status (3)

Cited By (3)

• 0
  • NL NL47002D patent/NL47002C/xx active
• 1936
  • 1936-10-10 US US105088A patent/US2216137A/en not_active Expired - Lifetime
  • 1936-10-12 GB GB27699/36A patent/GB467313A/en not_active Expired

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