EP0564902A1 - Package for photographic chemicals - Google Patents
Package for photographic chemicals Download PDFInfo
- Publication number
- EP0564902A1 EP0564902A1 EP93104841A EP93104841A EP0564902A1 EP 0564902 A1 EP0564902 A1 EP 0564902A1 EP 93104841 A EP93104841 A EP 93104841A EP 93104841 A EP93104841 A EP 93104841A EP 0564902 A1 EP0564902 A1 EP 0564902A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bag
- chemicals
- composition
- photographic
- bags
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- 239000000126 substance Substances 0.000 title claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 15
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 14
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 14
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims abstract description 12
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 7
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 4
- 239000004014 plasticizer Substances 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229920005862 polyol Polymers 0.000 claims description 3
- 150000003077 polyols Chemical group 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 239000011521 glass Substances 0.000 description 10
- 229940071826 hydroxyethyl cellulose Drugs 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 4
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 4
- 235000010262 sodium metabisulphite Nutrition 0.000 description 4
- 239000004296 sodium metabisulphite Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- DSVIHYOAKPVFEH-UHFFFAOYSA-N 4-(hydroxymethyl)-4-methyl-1-phenylpyrazolidin-3-one Chemical compound N1C(=O)C(C)(CO)CN1C1=CC=CC=C1 DSVIHYOAKPVFEH-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- TWNIBLMWSKIRAT-VFUOTHLCSA-N levoglucosan Chemical group O[C@@H]1[C@@H](O)[C@H](O)[C@H]2CO[C@@H]1O2 TWNIBLMWSKIRAT-VFUOTHLCSA-N 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- JWAZRIHNYRIHIV-UHFFFAOYSA-N 2-naphthol Chemical compound C1=CC=CC2=CC(O)=CC=C21 JWAZRIHNYRIHIV-UHFFFAOYSA-N 0.000 description 1
- ZVNPWFOVUDMGRP-UHFFFAOYSA-N 4-methylaminophenol sulfate Chemical compound OS(O)(=O)=O.CNC1=CC=C(O)C=C1.CNC1=CC=C(O)C=C1 ZVNPWFOVUDMGRP-UHFFFAOYSA-N 0.000 description 1
- -1 Hydroxy ethyl groups Chemical group 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical compound [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- XJJRZBBNJYBMFJ-UHFFFAOYSA-N hydroxylamine;sulfurous acid Chemical compound ON.OS(O)=O XJJRZBBNJYBMFJ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 229920000233 poly(alkylene oxides) Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000010378 sodium ascorbate Nutrition 0.000 description 1
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 1
- 229960005055 sodium ascorbate Drugs 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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)
- 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)
- Compositions Of Macromolecular Compounds (AREA)
- Packages (AREA)
Abstract
A package for solid photographic processing chemicals which comprises at least one bag which has been 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 a solid developer composition not more than 50g of sodium sulphite and/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.
Description
- 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. However, 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. On the other hand, it is expensive to transport concentrated chemical solutions because of the weight of water being transported.
- Efforts have been made to prepare photographic chemicals as mixed solid lumps of the correct proportions so that the correct amount is cut-off the lump to prepare for example 1000ml of working strength solution. However, in spite of adding wetting agents, expanding agents and other excipients to aid in the dissolution of the solid chemical lumps this method has not proved to be satisfactory.
- Increasing use is being made of water-soluble polyvinyl alcohol bags into which solid water-soluble chemicals are packed. These bags containing solid chemicals are then placed in the requisite quantity of water to provide a solution of the required strength. We have attempted to use polyvinyl alcohol bags in which to pack solid photographic chemicals which are then placed in water to yield a photographic processing solution of the requisite strength. However, in some cases the bags did not dissolve at all whilst in other cases initially the bags appeared to dissolve but after a few minutes a dense precipitate was observed in the solution which thus could not be used for photographic processing.
- We have found a method of packing photographic chemicals in water soluble bags in which the above listed disadvantages have been obviated.
- Therefore according to the present invention there is provided 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.
- It is to be understood that these figures relate to a composition to make 1000ml of working strength solution. If the package is for a lesser or a greater volume these figures must be adjusted mutatis mutandis.
- If these figures are exceeded the bag or bags will not dissolve and/or a cloudy solution is obtained.
- Often in the case of solid developer composition it is required to use two bags, one containing the developing agents and the other containing the remainder of the composition.
- Preferably 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.
- Preferably 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.
- Preferably the thickness of the bag is from 10 to 120µm and most preferably from 30-60µm.
- 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.
- The following Example will serve to illustrate the invention.
- 1.8g of Natrosol 250 LR grade Hydroxyethyl cellulose (as supplied by Hercules) and 0.2g of polyethylene glycol having a molecular mass of 200 were added to 98g of water at 20°C. This mixture was stirred and the pH of the mixture was adjusted to 10.0 by the addition of a small quantity of 4M sodium hydroxide. After 2 minutes stirring a clear colourless solution was obtained. This solution was poured onto a 10 inch by 6 inch glass plate and by use of a glass rod on even coating on the glass plate was obtained. The glass plate was heated to 50°C over a hot plate. After 120 minutes all the water had evaporated from the glass plate to give flexible tough film of 45 microns thickness which weighed 2.0g.
- The film was folded-over and the two opposing edges were heat-sealed to form an open-ended bag. Into this bag was placed a photographic paper developing composition having the following ingredients herein after referred to as 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 sachet was then added to 1000ml of water at 25°C. With gentle stirring the bag and the chemicals contained therein dissolved to yield a colourless clear solution in 3 minutes.
- 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.
- No difference was found in the sensitometric results obtained. This showed that the presence of the dissolved hydroxy ethyl cellulose and polyethylene glycol in the developer solution had no photographic effect on the exposed photographic material during development.
- A number of other bags were prepared similarly.
Other compositions packed in these bags were:-2. Rapid powder fix which comprised ammonium thiosulphate 98g sodium metabisulphite 16g packed in one bag 3. Film fix sodium thiosulphate 104g sodium metabisulphite 16g 4. Paper fixer ammonium thiosulphate 65g sodium metabisulphite 0.7g 5. Film developer bag A (hydroquinone 5g (metol 2g bag B (sodium sulphite 100g (borax 3g (sodium tripolyphosphate 3.5g 6. 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 ) - Each of these packages were placed in water at 20°C and the water was stirred. The results were as follows.
Composition Bag dissolution Colour of solution 1 complete clear in 3 mins 2 bag did not dissolve 3 bag did not dissolve 4 bag dissolved very slowly (50 minutes) 5 bag A dissolved, bag B did not dissolve 6 both bags dissolved clear in 3 mins 7 both bags dissolved clear in 3 mins - The bags which do not dissolve formed a sticky mass which rendered the solution useless for photographic use. As a comparison bags were prepared from polyvinyl alcohol.
- 3.6g of polyvinyl alcohol which was made from polyvinyl acetate which had been 88.0% hydrolysed and which had a molecular mass of 10,000, was mixed with 0.4g of polyethylene glycol having a molecular mass of 200. This mixture was dissolved in 96g of water at 30°C. After 10 minutes stirring a clear colourless solution was obtained. 30g of this solution was poured onto a 4 inch x 8 inch glass plate and by use of a glass rod an even coating on the glass plate was obtained. The glass plate was heated to 50°C over a hot plate. After 120 minutes all the water had evaporated from the glass plate to give a flexible tough film of 40 microns thickness which weighed 1.20g.
- The film was folded-over and the two opposing edges were heat-sealed to form an open-ended bag. Into this bag was placed a photographic paper developing composition having the following ingredients herein after referred to as composition 1 as hereinbefore set forth and also paper fixer of composition 4.
- The open ends of each bag was then heat sealed to form an enclosed sachet of in one case developer composition and in the other case fixer composition.
- These sachets were then added to 1000ml of water at 25°C and the water then stirred.
- In the case of the sachet which comprised developer composition 1 the bag dissolved within minutes but after 15 minutes a heavy precipitate appeared.
- In the case of the sachet which comprised fixing composition 4 the bag appeared to dissolve after 1 hour but then a heavy precipitate was observed.
- Thus neither of these solutions could be used to process photographic material.
- It is to be understood that in this Example the bags have been hand made and the bags filled by hand. In practice 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.
Claims (7)
- A package for solid photographic processing chemicals which comprises at least one bag which has been made from hydroxyethyl cellulose, characterised in that 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 a solid developer composition 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.
- A package according to claim 1 characterised in that the hydroxyethyl cellulose used to prepare the bags comprises from 1 to 10% by weight of a water-soluble plasticiser.
- A package according to claim 2 characterised in that the plasticiser is a polyol or a polyethylene oxide.
- A package according to claim 3 characterised in that the polyol is a polyethylene glycol which has a molecular mass of from 150 to 500.
- A package according to claim 1 characterised in that the photographic chemicals are a fixer composition packed in one bag.
- A package according to claim 1 characterised in that the photographic chemicals are a developing composition packed in one bag.
- A package according to claim 1 characterised in that the photographic chemicals are developing composition, the developing agents being present in one bag and the remainder of the composition being present in a second bag.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9207521 | 1992-04-07 | ||
GB929207521A GB9207521D0 (en) | 1992-04-07 | 1992-04-07 | Package for photographic chemicals |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0564902A1 true EP0564902A1 (en) | 1993-10-13 |
Family
ID=10713549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93104841A Withdrawn EP0564902A1 (en) | 1992-04-07 | 1993-03-24 | Package for photographic chemicals |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0564902A1 (en) |
JP (1) | JPH0643597A (en) |
GB (1) | GB9207521D0 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6424900A (en) * | 1987-07-21 | 1989-01-26 | Sanki Shokuhin Kk | Packed detergent |
EP0444230A1 (en) * | 1990-03-01 | 1991-09-04 | Aicello Chemical Company Limited | Cold water soluble film |
EP0469877A1 (en) * | 1990-07-30 | 1992-02-05 | Konica Corporation | Packaged photographic solid processing compositions |
-
1992
- 1992-04-07 GB GB929207521A patent/GB9207521D0/en active Pending
-
1993
- 1993-03-24 EP EP93104841A patent/EP0564902A1/en not_active Withdrawn
- 1993-03-25 JP JP10342493A patent/JPH0643597A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6424900A (en) * | 1987-07-21 | 1989-01-26 | Sanki Shokuhin Kk | Packed detergent |
EP0444230A1 (en) * | 1990-03-01 | 1991-09-04 | Aicello Chemical Company Limited | Cold water soluble film |
EP0469877A1 (en) * | 1990-07-30 | 1992-02-05 | Konica Corporation | Packaged photographic solid processing compositions |
Also Published As
Publication number | Publication date |
---|---|
GB9207521D0 (en) | 1992-05-20 |
JPH0643597A (en) | 1994-02-18 |
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