GB2290625A - Concentrated developer - Google Patents
Concentrated developer Download PDFInfo
- Publication number
- GB2290625A GB2290625A GB9412558A GB9412558A GB2290625A GB 2290625 A GB2290625 A GB 2290625A GB 9412558 A GB9412558 A GB 9412558A GB 9412558 A GB9412558 A GB 9412558A GB 2290625 A GB2290625 A GB 2290625A
- Authority
- GB
- United Kingdom
- Prior art keywords
- concentrated
- solution according
- developing
- developing solution
- reductone
- 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.)
- Granted
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- NVXLIZQNSVLKPO-UHFFFAOYSA-N Glucosereductone Chemical compound O=CC(O)C=O NVXLIZQNSVLKPO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012141 concentrate Substances 0.000 claims abstract description 10
- -1 silver halide Chemical class 0.000 claims abstract description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 7
- NDGRWYRVNANFNB-UHFFFAOYSA-N pyrazolidin-3-one Chemical compound O=C1CCNN1 NDGRWYRVNANFNB-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000008139 complexing agent Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 13
- 229940126062 Compound A Drugs 0.000 claims description 9
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 235000010323 ascorbic acid Nutrition 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical group OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims description 5
- 239000011668 ascorbic acid Substances 0.000 claims description 5
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 4
- 239000004285 Potassium sulphite Substances 0.000 claims description 4
- 229940072107 ascorbate Drugs 0.000 claims description 4
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 claims description 4
- 235000019252 potassium sulphite Nutrition 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulphite Substances [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 2
- ZKEGGSPWBGCPNF-UHFFFAOYSA-N 2,5-dihydroxy-5-methyl-3-(piperidin-1-ylamino)cyclopent-2-en-1-one Chemical group O=C1C(C)(O)CC(NN2CCCCC2)=C1O ZKEGGSPWBGCPNF-UHFFFAOYSA-N 0.000 claims description 2
- BFSVOASYOCHEOV-UHFFFAOYSA-N 2-diethylaminoethanol Chemical compound CCN(CC)CCO BFSVOASYOCHEOV-UHFFFAOYSA-N 0.000 claims description 2
- 229940013085 2-diethylaminoethanol Drugs 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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
- 239000002211 L-ascorbic acid Substances 0.000 claims description 2
- 235000000069 L-ascorbic acid Nutrition 0.000 claims description 2
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 claims description 2
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 229940102253 isopropanolamine Drugs 0.000 claims description 2
- 150000003335 secondary amines Chemical group 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- DNLDDJQODPSQCM-UHFFFAOYSA-N 1-(hydroxymethyl)pyrazolidin-3-one Chemical compound OCN1CCC(=O)N1 DNLDDJQODPSQCM-UHFFFAOYSA-N 0.000 claims 1
- 125000003289 ascorbyl group Chemical group [H]O[C@@]([H])(C([H])([H])O*)[C@@]1([H])OC(=O)C(O*)=C1O* 0.000 claims 1
- 229960003330 pentetic acid Drugs 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 abstract description 5
- 239000004332 silver Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 33
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 19
- 239000000203 mixture Substances 0.000 description 7
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 6
- 235000008504 concentrate Nutrition 0.000 description 5
- 239000012895 dilution Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 235000014666 liquid concentrate Nutrition 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 3
- 239000012964 benzotriazole Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 150000000994 L-ascorbates Chemical class 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- RXKJFZQQPQGTFL-UHFFFAOYSA-N dihydroxyacetone Chemical compound OCC(=O)CO RXKJFZQQPQGTFL-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- LQPLDXQVILYOOL-UHFFFAOYSA-I pentasodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O LQPLDXQVILYOOL-UHFFFAOYSA-I 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 235000010378 sodium ascorbate Nutrition 0.000 description 2
- 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 2
- 229960005055 sodium ascorbate Drugs 0.000 description 2
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical group [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 2
- XBDZRROTFKRVES-UHFFFAOYSA-N 2,3-dihydroxy-4,4,5,5-tetramethylcyclopent-2-en-1-one Chemical compound CC1(C)C(O)=C(O)C(=O)C1(C)C XBDZRROTFKRVES-UHFFFAOYSA-N 0.000 description 1
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 1
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical compound [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001513 alkali metal bromide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- HIOZQPNKVSTJOQ-UHFFFAOYSA-N bis(2-hydroxyethyl)azanium;hydrogen sulfite Chemical compound OS(O)=O.OCCNCCO HIOZQPNKVSTJOQ-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- 229940120503 dihydroxyacetone Drugs 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 description 1
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent 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
- G03C5/266—Supplying of photographic processing chemicals; Preparation or packaging thereof of solutions or concentrates
Landscapes
- 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)
Abstract
A concentrated photographic developer solution comprises per litre of concentrate from 50 - 550cc of water, from 100 - 600g of an alkanolamine with a pKa between 9.5 and 10.5, from 30 to 300g of a sulphite salt, from 50 to 300g of a reductone type developing agent and from 1 to 30g of a pyrazolidinone developing agent, the amounts being so chosen that the pH of the working strength developing solutions when the concentrate is diluted 1 to 19 with water is within the range of 9.5 to 11.0. The concentrate may also contain a metal complexing agent. The concentrated developing solution when diluted is of particular use in the processing of paper-based silver halide material.
Description
This invention relates to concentrated photographic silver halide developing solutions.
Suitable compositions and components for photographic developing solutions are well known, and are described for example, in the books
Photographic Processing Chemistry by LFA Mason, published by the Focal
Press in 1975, and Modern Photographic Processing by GM Haist, published by Wiley - Interscience in 1979.
The use of concentrated photographic developer solutions is also well known. A formulation of a concentrated hydroquinone developer which can be diluted 1 + 9 before use is given in Haist's book, vol 1, p.528.
By a concentrated photographic developer is meant a liquid concentrate which has to be diluted with water or other diluent before use. Liquid concentrates are useful in being simpler and quicker to dilute than powder formulations, and the greater the dilution factor the less water needs to be transported. Whilst concentrated developers for processing paper based silver halide materials with dilutive factors of 1 + 4 to 1 + 9 are common, the concentrated developing solutions of the present invention are formulated to be diluted by a factor of at least 1 + 18 with water.
However, well known disadvantages of concentrated developers include their diminishing activity in low throughput replenished systems and their high viscosity, making dilution a difficult process.
Concentrated developers until now have been based on dihydroxybenzene developing agents such as hydroquinone. Used at such high concentrations, the hydroquinone is poorly protected against aerial oxidation by the limited amount of sulphite which can be included in the formulation. Hence the diminished activity results from a reduction in hydroquinone concentration. Also, a further consequence of the high hydroquinone concentration is the need for an essentially non-aqueous composition. This results in the high viscosity of the composition.
It is the object of the present invention to provide a concentrated photographic developer which dilutes to afford stable solutions and which is itself less viscous, making dilution much easier.
Therefore according to the present invention there is provided a concentrated photographic developer solution which comprises per litre of concentrate from 50 - 550cc of water, from 100-600g of an alkanolamine with a pKa between 9.5 and 10.5, from 30 to 300g of a sulphite salt, from 50 to 300g of a reductone type developing agent and from 1 to 30g of a pyrazolidinone developing agent, the amounts being so chosen so that the pH of the working strength developing solutions when the concentrate is diluted 1 to 19 with water is within the range of 9.5 to 11.0.
The concentrated developing solution of the present invention when diluted is of particular use in the processing of paper-based silver halide material.
Preferably the concentrated developing solution comprises from 100 to 150g/litre of the reductone type developing agent.
Preferably the concentrated developing solution comprises from 90 to 270litre of the sulphite salt.
Examples of alkanolamines which can be used and their pKa are:
pKa
N-methyl ethanolamine 9.90 2-diethylamino ethanol 10.06 3-amino propanol 10.22 iso-propanolamine 9.60
N N-dimethylethanolamine 9.50
Examples of reductone type developing agents are reductone itself which is of the formula HOCH-COHCHO and other compounds which comprise the group -CO-CHOH or its tautomeric form -COH-COH- such as dihydroxyacetone, tetramethyl reductic acid or ascorbates of the general formula I
or salts thereof wherein R represents a hydroxylated alkyl, or compounds of general formula II:-
where X represents the atoms necessary to complete a ring system and Y is a secondary amine group.
Y in formula II is preferably a cyclic amine for example morpholine or piperidine.
An example of a particularly useful reductone of formula II is the compound of formula III:
This compound has the trivial name of piperidino-hexose reductone.
Preferably the reductone type compound present in the concentrated developer solution of the present invention is an ascorbate of the general formula I as hereinbefore set forth.
Preferred ascorbates of formula I are L-ascorbic acid, D-isoascorbic acid and L-erythroascorbic acid and salts thereof. A particularly useful ascorbate is sodium ascorbate as it is readily commercially available.
Pyrazolidinone developing agents are compounds of the general formula Iv: -
in which R5 is an aromatic ring, R1 and R2 are hydrogen, lower alkyl, or hydroxy alkyl, and R3 and R4 are hydrogen, lower alkyl or phenyl. By lower alkyl is meant an alkyl group with up to 3 carbon atoms.
Preferably R5 is phenyl or a substituted phenyl such as 4-methyl phenyl or 4-chioro-phenyl.
A particularly preferred compound for use in the developing solution of this aspect of the present invention is l-phenyl-4-methyl-4hydroxymethyl pyrazolid-3-one which is hereinafter referred to as compound A.
Compound A is present as a developing agent which acts synergistically with the reductone type developing agent to provide a super-additive developing agent combination. Preferably about lOg/litre are present in the concentrated developing solution.
Preferably the sulphite salt is an alkali metal sulphite and most preferably sodium or potassium sulphite.
By matching the pKa of the alkanolamine with the working strength pH of the developer the alkanolamine will function as a buffer. The alkanolamine also acts as a solvent for compound A to help formulate the concentrate. Further it acts as a developing accelerator in the working strength developing solution.
Preferably at least one metal complexing agent is present in the concentrated developer solution. A particularly suitable compound is diethylenetriamine pentacetic acid (DTPA).
Other suitable metal complexing agents include phosphonic acids such as l-hydroxyethylidene, l,l-diphosphonic acid, diethylenetriamine penta (methylenephosphonic acid), ethylene diamine tetra (methylene phosphonic acid) and alkali metal salts thereof.
An alkali metal bromide may be present in the concentrated developer solution as a developer antifoggant.
According to another aspect of the present invention there is provided a working strength silver halide developing solution which has been prepared by diluting the concentrated developer solution as hereinbefore set forth 1 to 17-21 of water by volume.
The accompanying Example will serve to illustrate the invention.
Example
A concentrated developer solution according to the present invention was prepared which comprised per litre of concentrate:
water 445cm3
N methyl ethanolamine 320cm3
DTPA (Acid) 40g
compound A 8g
ascorbic acid 142g
potassium bromide 20g
Benzotriazole 2g
potassium sulphite (65% w/v) 150cm3
Total volume - 1 litre
This is solution M1. One part of solution M1 was diluted with 19 parts of water to yield solution M2 having a pH of 10.40.
Solution M1 had a viscosity of 15.3 m Pas.
A comparison concentrated developer solution was prepared of the following composition.
diethanolamine bisulphite 770g
(15% w/w S02) digol 230g
hydroquinone 115g
compound A 8g
hydrobromic acid (48% w/w) 16cm3 DTPA Nag (37% w/v) 80cm3
Total volume = 1 litre
This is solution N1, which represents the favoured way of producing high dilution concentrates prior to this invention.
This solution had a viscosity of 1750m Pas.
An ascorbic liquid concentrate (developer P1) was prepared by using the following components.
water 670 ml potassium sulphite (65% w/v) 150 ml
DTPA Na5 (37% w/v) 68 ml potassium carbonate 200 g sodium ascorbate 100 g compound A 5g potassium bromide 10 g acetic acid (80% w/w) 17 ml benzotriazole 0.2 g Total volume l 1 litre To make a working strength developing solution this developer was diluted with 9 parts of water (developer P2) to yield a working strength developing solution having a pH of 10.5.
A hydroquinone based liquid concentrate (developer H1) was prepared using the following components: water 875cm3
DTPA Na5 (37% w/v) 35cm3 sodium sulphite 120g potassium carbonate 150g hydroquinone 35g compound A 2.5g potassium bromide 7g benzotriazole 0.3g sodium hydroxide (67% w/v) 12cm3 Total volume - 1 litre
pH (1 + 9) - 10.80
To make working strength developing solution this developer was diluted with 9 parts of water (developer H2)
All these three developing solutions were tested by processing exposed silver chlorobromide paper in the diluted working strength developing solutions, M2, H2 and P2, for 60 seconds at 200C.
In the table below:
D min is minimum density
Ds is 90% of Dmax (maximum density)
LER, contrast is difference between logE values at Dmin + 0.04 and Ds
SPF, speed is measured at a density of 0.6 + Dmin
FF is forced fog (density produced by processing unexposed paper for 60 seconds at 30"C) 'a' is a measure of redness or greenness of an image 'b' is a measure of blueness or yellowness of an image
IT(s) is induction time in seconds - the time elapsing before the photographic image begins to appear.
Developer Dmin Ds LER SPF FF 'a' 'b' IT(s)
M2 0.00 1.78 0.79 2.28 0.00 0.5 0.1 5.5
H2 0.00 1.82 0.82 2.29 0.00 0.7 0.1 9.0
P2 0.00 1.80 0.83 2.31 0.00 0.5 -0.3 8.5
Thus the concentrated developer solution of the present invention when diluted to working strength, ie 1 to 19 with water is very comparable within all particulars with ascorbic based developer P1 which was required to be diluted 1:9 with water and with the hydroquinone based developer solution H1 which was also required to be diluted 1:9 with water. The concentrated developer N1 was very viscous and thus difficult to measure out accurately.
Claims (16)
1. A concentrated photographic developer solution which comprises per
litre of concentrate from 50-550cc of water, from 100-600g of an
alkanolamine with a pKa between 9.5 and 10.5, from 30 to 300g of a
sulphite salt, from 50 to 300g of a reductone type developing agent
and from 1 to 30g of pyrazolidinone developing agent, the amounts
being so chosen so that the pH of the working strength developing
solutions when the concentrate is diluted 1 to 19 with water is
within the range of 9.5 to 11.0.
2. A concentrated developer solution according to claim 1 wherein the
alkanolamine is selected from
pKa
N-methyl ethanolamine 9.90
2-diethylamino ethanol 10.06
3-amino propanol 10.22
iso-propanolamine 9.60
N N-dimethylethanolamine 9.50
3. A concentrated developer solution according to claim 1 wherein the
reductone developing agent is an ascorbate of the general formula
I:
or alkali metal salts thereof wherein R represents a hydroxylated alkyl group.
4. A concentrated developing solution according to claim 3 wherein the
ascorbate is L-ascorbic acid, D-isoascorbic acid or
L-erythroascorbic acid or salts thereof.
5. A concentrated developing solution according to claim 1 wherein the
reductone developing agent is a compound of the general formula
II:
where X represents the atoms necessary to complete a ring system
and Y is a secondary amine group.
6. A concentrated developing solution according to claim 5 wherein
formula II Y is a cyclic amine.
7. A concentrated developing solution according to claim 1 wherein the
reductone developing agent is piperidino-hexose reductone.
8. A concentrated developing solution according to claim 1 wherein the
pyrazolidinone developing agent is l-phenyl-4-methyl-4
hydroxymethyl pyrazolidinone (compound A).
9. A concentrated developing solution according to claim 8 wherein lOg/litre of compound A is present.
10. A concentrated developing solution according to claim 1 wherein
from 300 to 400g/litre of the alkanolamine is present.
11. A concentrated developing solution according to claim 1 wherein
from 100 to 150g/litre of the reductone type developing agent is
present.
12. A concentrated developing solution according to claim 1 wherein
from 90 to 270g/litre of the sulphite salt is present.
13. A concentrated developing solution according to claim 1 wherein the
sulphite salt is sodium or potassium sulphite.
14. A concentrated developing solution according to claim 1 which also
comprises a metal complexing agent.
15. A concentrated developing solution according to claim 8 wherein the
metal complexing agent is diethylenetriamine penta-acetic acid.
16. A working strength photographic developing solution which has been
prepared by diluting 1 part of the concentrated developer solution
as claimed in claim 1 with 17-21 parts of water by volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9412558A GB2290625B (en) | 1994-06-22 | 1994-06-22 | Concentrated photographic developing solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9412558A GB2290625B (en) | 1994-06-22 | 1994-06-22 | Concentrated photographic developing solution |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9412558D0 GB9412558D0 (en) | 1994-08-10 |
| GB2290625A true GB2290625A (en) | 1996-01-03 |
| GB2290625B GB2290625B (en) | 1997-10-08 |
Family
ID=10757163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9412558A Expired - Fee Related GB2290625B (en) | 1994-06-22 | 1994-06-22 | Concentrated photographic developing solution |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2290625B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0877287A1 (en) * | 1997-05-09 | 1998-11-11 | Konica Corporation | Developer for silver halide light sensitive photographic material and processing method by use thereof |
| GB2345151A (en) * | 1998-12-22 | 2000-06-28 | Ilford Imaging Uk Ltd | Photographic developing solutions |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1030495A (en) * | 1961-09-04 | 1966-05-25 | Kodak Ltd | Improvements in photographic processing compositions |
| JPS60110164A (en) * | 1983-11-21 | 1985-06-15 | Matsushita Electric Ind Co Ltd | Thin film field effect transistor and manufacture thereof |
| EP0573700A1 (en) * | 1992-06-09 | 1993-12-15 | Agfa-Gevaert N.V. | Replenishment of a developer containing ascorbic acid and 3-pyrazolidone derivatives |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993011456A1 (en) * | 1991-12-02 | 1993-06-10 | E.I. Du Pont De Nemours And Company | Improved developer systems for hydrazine containing films |
-
1994
- 1994-06-22 GB GB9412558A patent/GB2290625B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1030495A (en) * | 1961-09-04 | 1966-05-25 | Kodak Ltd | Improvements in photographic processing compositions |
| JPS60110164A (en) * | 1983-11-21 | 1985-06-15 | Matsushita Electric Ind Co Ltd | Thin film field effect transistor and manufacture thereof |
| EP0573700A1 (en) * | 1992-06-09 | 1993-12-15 | Agfa-Gevaert N.V. | Replenishment of a developer containing ascorbic acid and 3-pyrazolidone derivatives |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0877287A1 (en) * | 1997-05-09 | 1998-11-11 | Konica Corporation | Developer for silver halide light sensitive photographic material and processing method by use thereof |
| US5998112A (en) * | 1997-05-09 | 1999-12-07 | Konica Corporation | Developer for silver halide light sensitive photographic material and processing method by use thereof |
| GB2345151A (en) * | 1998-12-22 | 2000-06-28 | Ilford Imaging Uk Ltd | Photographic developing solutions |
| GB2345151B (en) * | 1998-12-22 | 2002-11-06 | Ilford Imaging Uk Ltd | Photographic developing solutions |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9412558D0 (en) | 1994-08-10 |
| GB2290625B (en) | 1997-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20050622 |