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
  • G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
• • 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
  • G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
  • G03C5/265—Supplying of photographic processing chemicals; Preparation or packaging thereof of powders, granulates, tablets
• • 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
  • G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
  • G03C5/267—Packaging; Storage
• • 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
  • G03C5/305—Additives other than developers
• • 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
  • G03C5/38—Fixing; Developing-fixing; Hardening-fixing

Definitions

• This invention relates to packages for photographic chemicals.
• Photographic chemicals for use in processing exposed photographic material are usually sold either as solids which require to be weighed out and then dissolved in water or as concentrated solutions of chemicals which are then diluted to produce the required concentration.
• powdered chemicals require handling and efforts are being made to cut down the production of fine chemical particles which are sure to be formed when powdered chemicals are weighed out or added to water.
• it is expensive to transport concentrated chemical solutions because of the weight of water being transported.
• a package for photographic solid processing chemicals which comprises at least one bag made from hydroxyethyl cellulose, wherein the sum of the contents of the bag or bags based on the amount of chemicals to provide a working strength solution of 1000ml is not more than 100g of chemicals and of which in the case of developing chemicals not more than 50g of sodium sulphite and/or sodium or potassium carbonate may be present and of which in the case of a solid fixer composition not more than 70g of ammonium thiosulphate may be present.
• the hydroxyethyl cellulose used to prepare the bags comprise from 1 to 10% by weight of a water-soluble plasticiser.
• Suitable water-soluble plasticisers are polyols and polyalkylene oxide derivatives.
• An especially suitable plasticiser is a polyethylene glycol which has a molecular mass of from 150 to 500.
• the effect of the plasticiser is threefold. Firstly it renders the bag more flexible. Secondly it renders the bag heat sealable, thirdly it helps in the dissolution of the bag.
• the thickness of the bag, and the amount of plasticiser present in the polymer from which the bag is composed are so chosen that the bag dissolves in water at 20°C in less than 5 minutes and preferably in from 1 to 2 minutes, providing that the thickness of the bag is sufficient to enable the bag to be picked-up without it rupturing.
• the thickness of the bag is from 10 to 120 ⁇ m and most preferably from 30-60 ⁇ m.
• Hydroxy ethyl cellulose may be obtained by treating cellulose with sodium hydroxide and then reacting it with ethylene oxide. Hydroxy ethyl groups are introduced into the chain of anhydroglucose units which form the cellulose chain. Each anhydrocellulose unit has three reactive hydroxyl groups. The average number of moles of ethylene oxide that become attached to each anhydroglucose unit in the cellulose chain is called moles of substituent combined or M.S. The higher the M.S. the greater the water solubility of the hydroxy ethyl cellulose. However it is difficult and expensive to obtain a hydroxy ethyl cellulose with an M.S. of 3. A particularly useful hydroxy ethyl cellulose for use in the present invention has an M.S. of 2.5, and this is extremely water-soluble. An example of such a hydroxy ethyl cellulose is Natrosol 250 which is manufactured by and the registered trade mark of Hercules Incorporated. Clear films can be cast from this compound.
• the dimensions of the bag depend on the weight of the chemicals required to prepare 1000ml of the working strength solution.
• composition 1 sodium sulphite 5.4g diethylene triamine pentacetic acid 2g sodium ascorbate 30g 4 methyl-4 hydroxymethyl-1-phenyl-3 pyrazolidinone 2.5g potassium carbonate 30g potassium bromide 3.3g
• the open end was then heat sealed to form an enclosed sachet of the developer composition.
• This solution was used to develop thirty 10" x 8" sheets of exposed photographic black and white paper comprising a standard silver chlorobromide emulsion.
• the sensitometric results were compared with the results obtained using the same formulation developer which had been prepared using the same chemicals straight from their respective containers.
• Colour developing composition Potassium bromide 1.05g ) Bag A sodium tripoly phosphate 3.5g ) sodium carbonate 28.g ) sodium metabisulphite 1.5g ) sodium sulphite 3.0g ) Colour developing agent 2.38g ) Bag B hydroxylamine sulphite 2g ) 7. 'One shot' film developer sodium sulphite 5g ) Bag A sodium carbonate 2.5g ) stabiliser 0.012g) Hydroquinone 0.61g ) Bag B 4 methyl-4 hydroxymethyl-1 phenyl-3 pyrazolidinone 0.2g ) Ascorbic acid 1g ) Diethylene triamine pentaacetic acid 2g )
• composition 1 as hereinbefore set forth and also paper fixer of composition 4.
• each bag was then heat sealed to form an enclosed sachet of in one case developer composition and in the other case fixer composition.
• the bags have been hand made and the bags filled by hand.
• the bags are cast in bulk and they are filled in an automatic filling plant with the operators not coming into contact with the powdered chemicals.
• the packages are packed in boxes from which the photographic laboratory or end user picks up a bag or bags and dissolves it or them in water to prepare a working strength solution of the required composition without coming into contact with the powdered chemicals at all.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
• Wrappers (AREA)
• Packages (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10713549

Family Applications (1)

Country Status (3)

Citations (3)

• 1992
  • 1992-04-07 GB GB929207521A patent/GB9207521D0/en active Pending
• 1993
  • 1993-03-24 EP EP93104841A patent/EP0564902A1/fr not_active Withdrawn
  • 1993-03-25 JP JP10342493A patent/JPH0643597A/ja active Pending

Patent Citations (3)

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