US4070188A
Expired / Lapsed
US
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One bath type silver dye bleaching and silver bleaching
Assignee: Fujifilm Holdings Corp
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Filing: 1976-06-23
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Granted: 1978-01-24
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Expires: 1996-06-23
Abstract
Abstract A one bath type silver dye bleaching and silver bleaching solution which comprises at least a) a compound which forms a salt or a complex with silver, b) at last one acid selected from sulfamic acid, aliphatic and aromatic sulfonic acids, aliphatic and aromatic sulfinic acids, phosphoric acid and sulfuric acid, c) an organic acid having at least one carboxylic group in its molecule and d) a ferric salt (or a complex thereof with the organic acid c), in which case the solution comprises element a), b) and the complex).
Inventors
- 👤 Takashi Nakamura
- 👤 Shigeru Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/44; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
233 words
In a positive-positive silver dye bleaching process which comprises the steps of a black-and-white development, a dye bleaching, a silver bleaching and a fixing, the improvement which comprises the combination of the dye bleaching and silver bleaching steps by utilizing a one bath solution having a pH of below 1.5 which comprises the following components: a. at least one compound which forms a salt or a complex with silver selected from the group consisting of water soluble organic halides, water soluble inorganic halides, thiourea, thiourea derivatives, mercapto compounds, alkali metal salts of sulfur, alkaline earth metal salts of sulfur, urea, cystein, guanidine, aminoguanidine, cyanides and thiocyanides in an amount of from about 5 to about 150g/liter; b. at least one acid selected from sulfamic acid, aliphatic and aromatic sulfonic acids, aliphatic and aromatic sulfinic acids, phosphoric acid and sulfuric acid in an amount of from about 10 to about 120 g/liter, and c. at least one organic acid having at least one carboxyl group in the molecule in an amount from about 2 to about 60 g/liter and d. at least one ferric salt in an amount of from about 2 to about 60 g/liter, or a complex of said organic acid c) and said ferric salt d) in an amount of from about 4 to about 120 g/liter instead of said organic acid c) and said ferric salt d) in separate form.
Claim 2
Dependent Claim
233 words
In a positive-positive silver dye bleaching process which comprises the steps of a black-and-white development, a dye bleaching, a silver bleaching and a fixing, the improvement which comprises the combination of the dye bleaching and silver bleaching steps by utilizing a one bath solution having a pH of below 1.5 which comprises the following components: a. at least one compound which forms a salt or a complex with silver selected from the group consisting of water soluble organic halides, water soluble inorganic halides, thiourea, thiourea derivatives, mercapto compounds, alkali metal salts of sulfur, alkaline earth metal salts of sulfur, urea, cystein, guanidine, aminoguanidine, cyanides and thiocyanides in an amount of from about 5 to about 150g/liter; b. at least one acid selected from sulfamic acid, aliphatic and aromatic sulfonic acids, aliphatic and aromatic sulfinic acids, phosphoric acid and sulfuric acid in an amount of from about 10 to about 120 g/liter, and c. at least one organic acid having at least one carboxyl group in the molecule in an amount from about 2 to about 60 g/liter and d. at least one ferric salt in an amount of from about 2 to about 60 g/liter, or a complex of said organic acid c) and said ferric salt d) in an amount of from about 4 to about 120 g/liter instead of said organic acid c) and said ferric salt d) in separate form.
Claim 3
Dependent Claim
104 words
The process of claim 1 wherein said aliphatic or aromatic sulfonic acid comprises 1 or 2 sulfonic acid groups linked to a lower alkyl group having 1 to 5 carbon atoms or a phenyl group which is either unsubstituted or substituted by one or two lower alkyl groups having 1-5 carbon atoms and/or amino groups; said aliphatic or aromatic sulfinic acid comprises 1 or 2 sulfinic acid groups linked to a lower alkyl group having 1-5 carbon atoms or a to a phenyl group which is either unsubstituted or substituted by one or two lower alkyl groups having 1-5 carbon atoms and/or amino groups.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein said organic acid having at least one carboxylic acid group in the molecule thereof is an aliphatic or aromatic carboxylic acid or an aminopolycarboxylic acid.
Claim 5
Dependent Claim
91 words
The process of claim 1 wherein said aliphatic carboxylic acid is formic acid or straight or branched chain alkanes or alkenes having 1-18 carbon atoms substituted by one or more carboxyl groups and wherein said aromatic carboxylic acid is one wherein one or more carboxyl groups are linked to a benzene ring or an naphthylene ring, and wherein said aminopolycarboxylic acid has 1 to 3 amino groups and 2 to 8 carboxylic acid groups and a total of 1-15 carbon atoms, exclusive of the carbon atoms in the carboxylic acid group(s).
Claim 6
Dependent Claim
37 words
The process of claim 1 wherein said ferric salt is selected from the group ferric chloride, ferric nitrate, ferric citrate, ferric acetate, ferric oxalate, ferric sulfate, ferric bromide, ferric bichromate, ferric formate, ferric naphthenate and ferric phosphate.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the amount of component a) is 10 to 80 g/liter.
Claim 8
Dependent Claim
56 words
The process of claim 1, wherein said process includes the steps of i) imagewise exposing a light-sensitive material, prior to exposing, comprising a support having thereon a silver halide emulsion containing a bleachable dye to light, ii) developing said material by black-and-white development, iii) bleaching using the said one bath solution, and iv) fixing said material.
Claim 9
Dependent Claim
15 words
The process of claim 7, further including a fixing step between steps ii) and iii).
Claim 10
Dependent Claim
18 words
The process of claim 1, wherein the amount of component a) is about 10 to about 120 g/liter.
Claim 11
Dependent Claim
30 words
The process of claim 1, wherein the dye bleaching and silver bleaching step utilizing said solution is conducted at 20° to 40° C for about 2 to about 10 minutes.
Claim 12
Dependent Claim
55 words
The process of claim 1, wherein for component a), said thiourea derivatives are selected from the group consisting of those represented by the following formula (I) ##STR6## wherein R 1 , R 2 , R 3 and R 4 represent a hydrogen, an aliphatic group, an aryl group, an acyl group or an amino group.
Claim 13
Dependent Claim
31 words
The process of claim 1, wherein said component a) is selected from the group consisting of potassium iodide, sodium iodide, potassium bromide, sodium bromide, monoiodoacetic acid, thiourea, 1,3-dimethylthiourea, ethylenethiourea or tetramethylthiourea.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |