Patent Grant
6902876
The present invention relates to a concentrated color developer composition for use in silver halide photographic materials (hereinafter, also denoted simply as photographic materials) and a processing method by use thereof, and in particular, to a concentrated color developer composition exhibiting reduced degradation of ingredients during storage at relatively high temperature, reduced precipitation onto the processing bath during running and reduced staining of processed photographic materials, and a processing method of photographic materials by use thereof.
Photographic color developer compositions are used for processing photographic material providing an intended image. In general, such a composition contains a color developing agent as a reducing agent, forming an intended dye upon reaction with a dye forming coupler.
To replenish processing components which have been consumed in reaction or carried out by processed photographic material, color developer replenishing solution is supplied to color developing solution in a color developing tank. Such replenishment is designed so as to maintain uniform development and stability of the color developing agent. A color developer replenishing solution is usually prepared by mixing plural parts with water immediately before use thereof. In the photographic industry, reducing the number of such parts used for preparation of the replenishing solution has been desired to reduce troublesome handling. There has been disclosed a replenishing solution ready to use as such and a concentrated single part solution which was usable only by dilution with water, e.g., in JP-A 2001-100382 (hereinafter, the term, JP-A refers to Japanese Patent Application publication).
However, although the foregoing prior art was effective to prevent deposits during storage at relative low temperature, problems arose such that degradation of processing components occurred during storage at relative high temperature. It was further proved that precipitation onto the processing tank and staining of photographic material were caused during processing.
Accordingly, it is an object of the invention to provide a concentrated color developer composition which is stable even when aged at relative high temperature and which has achieved reduced precipitation onto the processing tank and less staining of processed photographic material, and a method for processing photographic materials by use thereof.
The present invention comprises the following constitution to solve the foregoing problem:
1. A color developer concentrate composition comprising a color developing agent, a sulfite and a compound represented by formula (1), the color developing agent concentration being 0.02 to 0.2 mol/l and the sulfite concentration meeting the following requirement:
Specific examples of the compound represented by formula (1) are shown below but the invention is by no means limited to these.
The compound represented by formula (1) is preferably contained in an amount of 0.01 to 0.1 mol/l.
Specific examples of the compound represented by formula (2) are shown below but the invention is by no means limited to these.
Specific examples of the compound represented by formula (3) are shown below but the invention is by no means limited to these.
The compound represented by formula (2) or the compound represented by formula (3) is preferably contained in a ratio of the compound represented by formula (2) or (3) to the compound represented by formula (1) of 1:1000 to 1:1, and more preferably 1:100 to 1:10. In other words, the molar ratio of the compound of formula (2) or (3) to the compound of formula (1) is preferably 1/1000 to 1/1, and more preferably 1/100 to 1/10.
Next, the concentrated color developer composition of the will be described. The concentrated color developer composition contains a color developing agent in an amount of 0.02 to 0.2 mol/l, preferably 0.03 to 0.1 mol/l, and more preferably 0.03 to 0.08 mol/l. Color developing agents usable in the invention include those which are commonly known in the photographic art.
Color developing agents used in the invention are para-phenylenediamine type color developing agents, which are commonly known in the photographic art and are selected from derivatives of para-phenylenediamine (hereinafter, also denoted as p-phenylenediamine), i.e., p-phenylenediamine compounds.
The p-phenylenediamine-type color developing agent is represented by the following general formula:
wherein R1, R2, R3 and R4 each are independently a hydrogen atom, halogen atom, carboxyl group, sulfo group, sulfamoyl group, alkylsulfonyl group, or an alkyl, alkoxy or aryl group, which may be substituted, provided that R2 and R3, or R3 and R4 may combine with each other to form a ring; n is an integer of 0 to 3.
The p-phenylenediamine-type color developing agents used in the invention preferably are a p-phenylenediamine compound having a water-solubilizing group (i.e., group promoting solubility in water) to achieve effects of the invention. Thus, the p-phenylenediamine compound having a water-solubilizing group exhibits advantages such as causing no stain in photographic material and no skin irritation, as compared to p-phenylenediamine type compound having no water-solubilizing group, such as N,N-diethyl-p-phenylenediamine. The water-solubilizing group is substituted onto an amino group or on a benzene nucleus of the p-phenylenediamine compound. Preferred examples of the water-solubilizing group include —(CH2)n—CH2OH, —(CH2)m—NHSO2—(CH2)n—CH3, —(CH2)m—O—(CH2)n—CH3, —(CH2CH2O)n—CmH2m+1, —COOH and —SO3H, in which m and n are each an integer of 0 or more. Of these water-solubilizing groups, —(CH2)n—CH2OH is more preferred. Thus, hydroxyalkyl-substituted p-phenylenediamine type color developing agents are more preferred.
Preferred examples of the p-phenylenediamine type color developing agents used in the invention are shown below.
Of the foregoing exemplified color developing agents, compound (3) is specifically preferred, which is hereinafter denoted as CD-4.
The concentrated color developer composition of the invention contains a sulfite salt (e.g., sodium or potassium sulfite). In the invention, the concentration of the sulfite salt (hereinafter, also denoted as sulfite concentration) satisfies the following requirement (i.e., ratio of sulfite concentration or color developing agent concentration):
The concentrated color developer composition preferably contains the compound represented by formula (4), as described earlier. Specific examples of the compound represented by formula (4) are shown below but are not limited to these.
(4)-1 Ethylene glycol
(4)-2 Diethylene glycol
(4)-3 Triethylene glycol
(4)-4 Tetraethylene glycol
(4)-5 Propylene glycol
(4)-6 Dipropylene glycol
(4)-7 Tripropylene glycol
(4)-8 Polyethylene glycol #200 (M.W. 200)
(4)-9 Polyethylene glycol #300 (M.W. 300)
(4)-10 Polyethylene glycol #400 (M.W. 400)
(4)-11 Polyethylene glycol #600 (M.W. 600)
(4)-12 Polyethylene glycol #100 (M.W. 100)
(4)-13 Polypropylene glycol (M.W. 400)
(4)-14 Polypropylene glycol (M.W. 700)
Of these, compounds (4)-1, 2, 8, 9 and 10 are preferred. The compound represented by formula (4) is preferably contained in an amount of 1 to 50 g/l, and more preferably 4 to 30 g/l when the concentrated color developer composition is diluted 4 times and used as a color developer replenishing solution.
Allowing chelating agents to be contained in the concentrated color developer composition can prevent contamination due to heavy metals, thereby enhancing preservative capability. Specifically, the use of chelating agents represented by formula (5), (6) or (7) described earlier leads to markedly enhanced effects of the invention.
Next, the compounds represented by formula (5), (6) or (7) will be detailed.
In formula (5), A11 through A14 are either the same or different and represent —CH2OH, —PO3(M6)2 or —COOM7, in which M6 and M7 are each a hydrogen atom, ammonium, an alkali metal atom (e.g., sodium, potassium), or an organic ammonium group (e.g., methylammonium, trimethylammonium); X represents an alkylene group having 2 to 6 carbon atoms, which may be substituted, or —(B1O)n—B2—, in which B1 and B2 are either the same of different and represent an alkylene group having 1 to 5 carbon atoms. Examples of the alkylene group represented by X include ethylene, trimethylene and tetramethylene. Examples of the alkylene group represented by B1 and B2 include methylene, ethylene and trimethylene. The alkylene group represented by X, B1 and B2 may be substituted and examples of a substituent include hydroxy, an alkyl group having 1 to 3 carbon atoms (e.g., methyl, ethyl); and n is an integer of 1 to 6, and preferably an integer of 1 to 4.
Specific examples of the compound represented by formula (5) are shown below but are not limited to these.
Compounds represented by formula (5) can be readily synthesized in accordance with commonly known methods. Of the foregoing compounds, compounds (5-1), (5-3) and (5-14) are preferred. The compounds represented by formula (5) include isomers. Any isomer thereof is preferred. Of the isomers, isomer (S,S) is specifically preferred.
Next, the compound represented by formula (6) will be described. In formula (6), A21 through A24 are either the same or different and represent —CH2OH, —PO3(M2)2 or —COOM1, in which M1 and M2 are each a hydrogen atom, ammonium, an alkali metal atom (e.g., sodium, potassium), or an organic ammonium group (e.g., methylammonium, trimethylammonium).
X1 represents a straight chain or branched alkylene group having 2 to 6 carbon atoms, saturated or unsaturated cyclic organic group or —(B11O)n5—B12—, in which B11 and B12 are either the same of different and represent an alkylene group having 1 to 5 carbon atoms, which may be substituted. Examples of the alkylene group represented by X1 include ethylene, trimethylene and tetramethylene. Examples of the alkylene group represented by B11 and B12 include methylene, ethylene and trimethylene. The alkylene group represented by X1, B11 and B12 may be substituted and examples of a substituent include hydroxy, an alkyl group having 1 to 3 carbon atoms (e.g., methyl, ethyl); and n5 is an integer of 1 to 6, preferably an integer of 1 to 4, and more preferably 1 or 2.
Specific examples of the compound represented by formula (6) are shown below but are not limited to these.
Of the foregoing compounds, (6-16), (6-17), (6-18), (6-19) and (6-20) include both cis-isomers. The compound represented by formula (6) can be readily synthesized by the commonly known method. Of the foregoing compounds, (6-1), (6-2) and (6-6) are preferred.
The compound represented by formula (5) or (6) is preferably contained in an amount of 0.001 to 0.1 mol/l, and more preferably 0.005 to 0.05 mol/l when the concentrated color developer composition is diluted 4 times and used as a color developer replenishing solution.
Next, the compound represented by formula (7) described earlier will be described. In formula (7), A1, A2, A3 and A4 are either the same or different and represent a hydrogen atom, hydroxy, —COOM3, —PO3(M4)2, —CH2COOM5, —CH2OH or a lower alkyl group (e.g., methyl, ethyl iso-propyl, n-propyl), in which M1, M2, M3, M4 and M5 are each a hydrogen atom, ammonium, alkali metal atom or organic ammonium group (and preferably a hydrogen atom, sodium or potassium atom), provided that at least one of A1, A2, A3 and A4 is —COOM3, —PO3(M4)2 or —CH2COOM5; n7 is an integer of 0 to 2.
Specific examples of preferred compounds represented by formula (7) are shown below.
The chelating agent represented by formula (7) is preferably contained in an amount of 0.001 to 0.1 mol/l, and more preferably 0.005 to 0.05 mol/l when the concentrated color developer composition is diluted 4 times and used as a color developer solution.
The concentrated color developer composition is diluted at least 4 times and used as a worker of color developer solution, in which the developing temperature is, for example, 20 to 55° C., and preferably 30 to 55° C. In the case of camera material, the developing time is, for example, 20 sec. to 10 min., preferably 30 sec. to 8 min., more preferably 1 to 6 min., and still more preferably 1 min 10 sec, to 3 min. 30 sec.
When used to develop photographic material, the concentrated color developer composition of the invention may be diluted with water in a prescribed proportion to prepare a color developer replenishing solution. The concentrated composition preferably is directly supplied as such to a color developer tank of the automatic processor as a replenisher. In this case, in addition to the concentrated composition, water may be supplied to the color developer tank.
Embodiments of the invention will be further described based on examples.
A concentrated color developer composition was prepared in accordance with the following formula.
Sodium sulfite, in an amount shown in Table 1
The total volume was made to 1 liter with water and the pH was adjusted with 50% sulfuric acid or potassium hydroxide. The thus prepared concentrated color developer composition was put into a hermetically sealed container and aged in an incubator maintained at 50° C. for 2 months.
The developer composition was diluted two times with water to prepare a color developer replenishing solution. The replenishing solution was put into a polyethylene vessel having an open top area ratio of 0.15 cm−1. and having been aged for one month in an incubator maintained at 30° C. After being aged, precipitation onto the wall of the vessel and the residual content of CD-4 (expressed in %) were measured. Furthermore, using the aged replenishing solution, photographic material was continuously processed to evaluate running performance. In the running process, Konica Color CENTURIA 800, CENTURIA 400 and CENTURIA 100 (each of which were 35 mm side, 24 exposure) were used in a ration of 50:25:25. These film samples were exposed by making practical camera exposure.
The thus exposed samples were processed in a volume of 50 rolls per day until the replenished volume reached 3 times the processing tank volume. There was used an automatic processor KP-46QA, available from Konica Corp.
Processing Step and Condition
A color developer starting solution, bleaching solution, fixing solution and stabilizing solution were each prepared according to the following formulas.
Color Developer Working Solution (per liter)
Water was added to make 1 liter and the pH was adjusted with ammonia water or 50% sulfuric acid.
Upon completion of running process, photographic material (Konica Color CENTURIA 400), exposed through an optical wedge was processed and yellow densities were measured with respect to minimum and maximum density areas (DminY, DmaxY). At the start of running process on the final day, the extent of staining onto the surface of processed film was evaluated. Results are shown in Table 1.
Extent of Precipitation on the Tank Walls
As can be seen from Table 1, it was proved that the combination of compounds according to the invention led to reduced precipitation and enhanced CD-4 residual ratio in replenishing solution aged at high temperature and superior running processing performance. It was also proved that the color developing agent concentration was effective at not less than 0.02 mol/l and preferably at not less than 0.03 mol/l and compound 1-18 was preferable. It was further proved that the ratio of sulfite concentration to developing agent concentration was effective at not less than 0.1 and preferably at not less than 1.0.
Experiments were conducted similarly to Experiment No. 1-13 in Example 1, provided that the developer composition further contained compounds shown in Table 2 and aged in the incubator at 50° C. for 3 months. Results thereof are shown in Table 2.
As can be seen from Table 2, it was proved that containing compounds of formula (2) or (3) the developer composition led to further enhanced effects of the invention. It was also proved that the molar ratio of the compounds to the compound of formula (1) was preferably 0.01 to 0.1.
Experiments were conducted similarly to Experiment No. 1-13 in Example 1, provided that the developer composition further contained compounds shown in Table 3 and aged in the incubator at 50° C. for 3 months. Results thereof are shown in Table 3.
As can be seen from Table 3, it was proved that the use of compounds of formula (4) led to preferable results.
Experiments were conducted similarly to Experiment No. 1-13 in Example 1, provided that penta-sodium diethylenetriaminepentaacetate (also denoted as DTPA-Na) contained the developer composition was changed to compounds shown in Table 3 and the developer composition was aged in the incubator at 50° C. for 3 months. Results thereof are shown in Table 4.
As apparent from Table 4, it was proved that the use of chelating agents represented by formula (5) through (7) was preferable to enhance effects of the invention.
A concentrated color developer composition was prepared according to the following formula:
Water was added to make a total volume of 1 liter and the pH was adjusted with 50% sulfuric acid or potassium hydroxide.
The thus prepared composition was put into a hermetically sealed container and aged in the incubator at 50° C. for 2 months. A part of the developer composition was diluted two times with water to prepare a color developer replenishing solution. The replenishing solution was put into a polyethylene vessel having an open top area ratio of 0.15 cm−1. and having been aged for one month in the incubator maintained at 30° C. The residual developer composition was also put into a polyethylene vessel having an open top area ratio of 0.15 cm−1. and having been aged for one month in the incubator maintained at 30° C. After being aged, precipitation onto walls of the container and the residual content of the color developing agent (expressed in were measured. Results thereof are shown in Table 5.
In Table 5, CD-3 refers to exemplified color developing agent (1) described earlier. As can be seen from Table 5, CD-4 is preferred as a color developing agent used in the invention.
A concentrated color developer composition was prepared according to the following formula:
Water was added to make a total volume of 1 liter and the pH was adjusted with 50% sulfuric acid or potassium hydroxide.
The thus prepared composition was put into a hermetically sealed container and aged in the incubator at 50° C. for 2 months. A part of the developer composition was diluted two times with water to prepare a color developer replenishing solution. The replenishing solution was put into a polyethylene vessel having an open top area ratio of 0.15 cm−1. and having been aged for one month in the incubator maintained at 30° C. The residual developer composition was also put into a polyethylene vessel having an open top area ratio of 0.15 cm−1. and having been aged for one month in the incubator maintained at 30° C.
After being aged, processing photographic material using the aged replenishing solution and the aged developer composition, evaluation was made with respect to running performance. The evaluation of running performance was conducted similarly to Example 1, using an automatic processor, in which processor KP-46QA (produced by Konica Corp.) was modified so that in addition to the replenishing solution, water was also replenished to the developing tank. In the color developing step, the replenishing rate is as follow:
Upon completion of running process, photographic material (Konica Color CENTURIA 400), exposed through an optical wedge was processed and yellow densities were measured with respect to minimum and maximum density areas (DminY, DmaxY). At the start of running process on the final day, the extent of staining onto the surface of processed film was evaluated. Results are shown in Table 5.
As can be seen from Table 6, it was proved that directly replenishing the concentrated color developer composition into the developing tank of the processor also resulted enhanced effects of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2002-024954 | Feb 2002 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5028517 | Kuse et al. | Jul 1991 | A |
| 5100765 | Fujimoto | Mar 1992 | A |
| 5354646 | Kobayashi et al. | Oct 1994 | A |
| 5459014 | Nishijima et al. | Oct 1995 | A |
| 5547817 | Okada et al. | Aug 1996 | A |
| 5595860 | Ishikawa et al. | Jan 1997 | A |
| 6043007 | Abe | Mar 2000 | A |
| 6274300 | Seki | Aug 2001 | B1 |
| 20020061475 | Duan | May 2002 | A1 |
| Number | Date | Country |
|---|---|---|
| 0426062 | May 1991 | EP |
| 0528406 | Feb 1993 | EP |
| 1283445 | Feb 2003 | EP |
| Number | Date | Country | |
|---|---|---|---|
| 20030190559 A1 | Oct 2003 | US |
