US4304847A
Expired / Lapsed
US
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Color image forming dye bleach process
Assignee: Fujifilm Holdings Corp
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Filing: 1979-11-13
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Granted: 1981-12-08
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Expires: 1999-11-13
Abstract
Abstract A color image forming process which comprises processing a photographic light-sensitive element comprising a support having thereon a layer containing imagewise distributed silver therein with an aqueous alkaline solution containing a stannous ion and in the presence of a dye and a bispyridinium compound represented by the following general formula: ##STR1## wherein R 1 and R 2 each represents a lower aliphatic hydrocarbon group or R 1 and R 2 are bonded each other to form a ring; n represents 0 or 1; and X - represents an anion; to bleach the dye in an imagewise manner. By the process of the present invention, color images which are stable to light, heat and moisture are formed using light-sensitive elements containing a reduced amount of silver salt and without using chemicals causing environmental pollution problems for the processing.
Inventors
- 👤 Koichi Nakamura
- 👤 Isao Shimamura
- 👤 Yukio Maekawa
- 👤 Koichi Koyama
- 👤 Shigeki Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:36
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/14; G; G03; G03C; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
101 words
A process for forming color images which comprises processing a photographic light-sensitive element containing imagewise distributed silver therein with an aqueous alkaline solution having a pH of about 10 or more containing a stannous ion and in the presence of a dye and a bispyridinium compound represented by the following general formula (I): ##STR10## wherein R 1 and R 2 each represents a lower aliphatic hydrocarbon group or R 1 and R 2 are bonded to each other to form a ring; n represents 0 or 1; and X - represents an anion; to bleach the dye in an imagewise manner.
Claim 2
Dependent Claim
101 words
A process for forming color images which comprises processing a photographic light-sensitive element containing imagewise distributed silver therein with an aqueous alkaline solution having a pH of about 10 or more containing a stannous ion and in the presence of a dye and a bispyridinium compound represented by the following general formula (I): ##STR10## wherein R 1 and R 2 each represents a lower aliphatic hydrocarbon group or R 1 and R 2 are bonded to each other to form a ring; n represents 0 or 1; and X - represents an anion; to bleach the dye in an imagewise manner.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein the photographic light-sensitive element is processed with an alkaline solution containing a stannous ion and an organic phosphonic acid.
Claim 4
Dependent Claim
51 words
The process of claim 1, wherein the bispyridinium compound is a compound represented by the following general formula (Ia) or (Ib): ##STR11## wherein m represents an integer of 2 to 4; R' and R" each represents an alkyl group having 1 to 3 carbon atoms; and X - represents an anion.
Claim 5
Dependent Claim
111 words
The process of claim 1, wherein the organic phosphonic acid or the salt thereof is a compound represented by the following formula (III): R.sub.4 R.sub.5 C(PO.sub.3 M.sub.2).sub.2 (III) wherein R 4 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aralkyl group, an alicyclic group, --CHR 6 --PO 3 M 2 (wherein R 6 represents a hydrogen atom, a hydroxy group or an alkyl group) or --PO 3 M 2 ; R 5 represents a hydrogen atom, a hydroxy group, an alkyl group, a substituted alkyl group or --PO 3 M 2 ; M represents a hydrogen atom or a cation capable of providing water solubility.
Claim 6
Dependent Claim
89 words
The process of claim 1, wherein said organic phosphonic acid or salt thereof is represented by the following formula (IV): ##STR12## wherein R 7 represents --COOM' or --PO(OM) 2 ; R 8 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, --(CH 2 ) n COOM' or a phenyl group; R 9 represents a hydrogen atom or --COOM'; M and M' each represents a hydrogen atom, an alkali metal atom or an ammonium group; m is 0 or 1; and n represents 1 to 4.
Claim 7
Dependent Claim
65 words
The process of claim 2, wherein said organic phosphonic acid or salt thereof is represented by the formula (II): R.sub.3 N(CH.sub.2 PO.sub.3 M.sub.2).sub.2 (II) wherein M represents a hydrogen atom or a cation capable of rendering the compound soluble and R 3 represents an alkyl group containing 1 to 4 carbon atoms, an aryl group, an aralkyl group, an alicyclic group, or a heterocyclic group.
Claim 8
Dependent Claim
13 words
The process of claim 1, wherein said dye is a reducibly bleachable dye.
Claim 9
Dependent Claim
12 words
The process of claim 7, wherein said dye is an azo dye.
Claim 10
Dependent Claim
29 words
The process of claim 1, wherein said dye is present in said light-sensitive element in a silver halide emulsion layer or a layer adjacent a silver halide emulsion layer.
Claim 11
Dependent Claim
18 words
The process of claim 1, wherein the aqueous alkaline solution has a pH of about 12 to 13.5.
Claim 12
Dependent Claim
41 words
The process of claim 1, wherein said aqueous alkaline solution contains a stannous salt selected from the group consisting of SnCl 2 , SnSO 4 , Sn(NO 3 ) 2 , Sn(CH 3 COO) 2 and SnC 2 O 4 .
Claim 13
Dependent Claim
25 words
The process of claim 1, wherein said aqueous alkaline solution contains a stannous salt in an amount of about 1×10 -3 to about 1 mol/liter.
Claim 14
Dependent Claim
25 words
The process of claim 2, wherein said organic phosphonic acid is present in said solution in an amount of 5×10 -3 to about 1 mol/liter.
Claim 15
Dependent Claim
15 words
The process of claim 1, wherein said bispyridinium compound is present in a fixing solution.
Claim 16
Dependent Claim
18 words
The process of claim 1, wherein said bispyridinium compound is present in said solution containing said stannous ion.
Claim 17
Dependent Claim
25 words
The process of claim 14, wherein said bispyridinium compound is present in said fixing solution in an amount of about 5×10 -5 to 0.1 mol/liter.
Claim 18
Dependent Claim
11 words
The process of claim 1, wherein positive color images are formed.
Claim 19
Dependent Claim
142 words
A process of forming color positive images which comprises developing an imagewise exposed photographic element comprising a support having thereon at least one layer containing a silver halide emulsion and a dye to form an image pattern of developed silver, fixing the photographic element with a fixing solution containing a bispyridinium compound represented by the following general formula (I): ##STR13## wherein R 1 and R 2 each represents a lower aliphatic hydrocarbon group or R 1 and R 2 are bonded to each other to form a ring; n represents 0 or 1; and X - represents an anion, and a thiosulfate; processing the fixed photographic element with an alkaline aqueous solution having a pH of 10 or more containing a stannous salt to bleach the dye in an imagewise manner and then blixing the photographic element to remove the development silver.
Claim 20
Dependent Claim
142 words
A process of forming color positive images which comprises developing an imagewise exposed photographic element comprising a support having thereon at least one layer containing a silver halide emulsion and a dye to form an image pattern of developed silver, fixing the photographic element with a fixing solution containing a bispyridinium compound represented by the following general formula (I): ##STR13## wherein R 1 and R 2 each represents a lower aliphatic hydrocarbon group or R 1 and R 2 are bonded to each other to form a ring; n represents 0 or 1; and X - represents an anion, and a thiosulfate; processing the fixed photographic element with an alkaline aqueous solution having a pH of 10 or more containing a stannous salt to bleach the dye in an imagewise manner and then blixing the photographic element to remove the development silver.
Claim 21
Dependent Claim
29 words
The process of claim 18, wherein the photographic light-sensitive element is processed with an alkaline aqueous solution containing a stannous salt and an organic phosphonic acid or salt thereof.
Claim 22
Dependent Claim
49 words
The process of claim 18, wherein the bispyridinium compound is a compound represented by the following formula (Ia) or (Ib): ##STR14## wherein m represents an integer of 2 to 4; R' and R" each represents an alkyl group having 1 to 3 carbon atoms; and X.sup.⊖ represents an anion.
Claim 23
Dependent Claim
17 words
The process of claim 18, wherein the aqueous alkaline solution has a pH of 12 to 13.5.
Claim 24
Dependent Claim
13 words
The process of claim 18, wherein said dye is a reducibly bleachable dye.
Claim 25
Dependent Claim
12 words
The process of claim 22, wherein said dye is an azo dye.
Claim 26
Dependent Claim
37 words
The process of claim 18, wherein said stannous salt is selected from the group consisting of SnCl 2 , SnSO 4 , Sn(NO 3 ) 2 , Sn(CH 3 COO) 2 and SnC 2 O 4 .
Claim 27
Dependent Claim
21 words
The process of claim 18, wherein said stannous salt is present in an amount of about 1×10 -3 to 1 mol/liter.
Claim 28
Dependent Claim
21 words
The process of claim 19, wherein said phosphonic acid is present in an amount of about 5×10 -3 to 1 mol/liter.
Claim 29
Dependent Claim
26 words
The process of claim 18, wherein said bispyridinium compound is present in said fixing solution in an amount of about 5×10 -5 to 2×10 -2 mol/liter.
Claim 30
Dependent Claim
19 words
The process of claim 18, wherein said dye is present in a layer adjacent said silver halide emulsion layer.
Claim 31
Dependent Claim
50 words
The process of claim 18, wherein said photographic element comprises a support having thereon at least one blue-sensitive silver halide emulsion layer, a bleachable yellow dye-containing layer, a green-sensitive silver halide emulsion layer, a bleachable magenta dye-containing layer, a red-sensitive silver halide emulsion layer, and a bleachable cyan dye-containing layer.
Claim 32
Dependent Claim
22 words
The process of claim 18, wherein the organic phosphonic acid is 2-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid, ethane-1,1,1-triphosphonic acid, 1-hydroxyethane-1,1,2-triphosphonic acid or 2-phosphonobutane-1,2,4-tricarboxylic acid.
Claim 33
Dependent Claim
29 words
The process of claim 18, wherein the organic phosphonic acid is hydroxyethane-1,1-diphosphonic acid and the bispyridinium salt is a compound of the formula: ##STR15## wherein X.sup.⊖ represents an anion.
Claim 34
Dependent Claim
26 words
The process of claim 1 wherein said photographic light-sensitive element contains silver in an amount substantially less than the amount stoichiometrically required to bleach said dye.
Claim 35
Dependent Claim
26 words
The process of claim 18 wherein said photographic light-sensitive element contains silver in an amount substantially less than the amount stoichiometrically required to bleach said dye.
Claim 36
Dependent Claim
17 words
The process of claim 1 wherein said photographic material contains less than about 3 g/m 2 silver.
Claim 37
Dependent Claim
17 words
The process of claim 18 wherein said photographic material contains less than about 3 g/m 2 silver.
Claim 38
Dependent Claim
17 words
The process of claim 1 wherein said photographic material contains less than about 2 g/m 2 silver.
Claim 39
Dependent Claim
17 words
The process of claim 18 wherein said photographic material contains less than about 2 g/m 2 silver.
Claim 40
Dependent Claim
26 words
The process of claim 1 wherein said photographic material contains silver in a catalytic amount substantially less than the amount stoichiometrically required to bleach said dye.
Claim 41
Dependent Claim
26 words
The process of claim 18 wherein said photographic material contains silver in a catalytic amount substantially less than the amount stoichiometrically required to bleach said dye.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |