US4740452A
Expired / Lapsed
US
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Process for preparing negative images
Assignee: Fujifilm Holdings Corp
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Filing: 1986-05-22
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Granted: 1988-04-26
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Expires: 2006-05-22
Abstract
Abstract The present invention provides a process for preparing a negative image of high contrast comprising developing an exposed silver halide photographic material which is substantially a surface latent image-type material in the presence of a hydrazine derivative, wherein said material is processed with a water-soluble alkaline developer having a pH value of from 10.5 to 12.3 and at least comprising the following components (1) through (3): (1) a dihydroxybenzene-type developing agent; (2) 0.3 mole/liter (developer) or more of a sulfite preservative; and (3) from 0.01 to 0.30 mole/liter (developer) of a compound of formula (A) ##STR1## in which R 2 represents an alkyl group having from 3 to 6 carbon atoms; R 3 and R 4 each represents an alkyl or hydroxyalkyl group having from 1 to 10 carbon atoms. The formed negative images are of high contrast and are almost free from silver stain. The sensitivity is high and the dot image quality is good.
Inventors
- 👤 Eiichi Okutsu
- 👤 Mitsunori Hirano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:29
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A process for preparing a negative image of high contrast comprising developing an exposed silver halide photographic material, in the presence of a hydrazine derivative, wherein the material is processed with a water-soluble alkaline developer having a pH value of from 10.5 to 12.3 and at least comprising the following components (1) through (3): (1) a dihydroxybenzene-type developing agent; (2) 0.3 mole/liter (developer) or more of a sulfite preservative; and (3) from 0.01 to 0.30 mole/liter (developer) of a compound of formula (A) ##STR7## in which R 2 represents an alkyl group having from 3 to 6 carbon atoms; R 3 and R 4 each represents an alkyl or hydroxyalkyl group having from 1 to 10 carbon atoms.
Claim 2
Dependent Claim
118 words
A process for preparing a negative image of high contrast comprising developing an exposed silver halide photographic material, in the presence of a hydrazine derivative, wherein the material is processed with a water-soluble alkaline developer having a pH value of from 10.5 to 12.3 and at least comprising the following components (1) through (3): (1) a dihydroxybenzene-type developing agent; (2) 0.3 mole/liter (developer) or more of a sulfite preservative; and (3) from 0.01 to 0.30 mole/liter (developer) of a compound of formula (A) ##STR7## in which R 2 represents an alkyl group having from 3 to 6 carbon atoms; R 3 and R 4 each represents an alkyl or hydroxyalkyl group having from 1 to 10 carbon atoms.
Claim 3
Dependent Claim
40 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein at least one of R 3 and R 4 in the formula (A) represents a hydroxyalkyl group having from 2 to 4 carbon atoms.
Claim 4
Dependent Claim
30 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein the compound of formula (A) is selected from n-butyldiethanolamine, n-propyldiethanolamine, 2-di-isopropylaminoethanol, N,N-di-n-butylethanolamine and 3-di-propylamino-1,2-propane-diol.
Claim 5
Dependent Claim
78 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein a compound of the following formula (B) or (C) is used together with the compound of formula (A) R.sub.5 --SO.sub.3 M (B) R.sub.6 --COOM (C) wherein M represents a hydrogen atom or Na, K or NH 4 ; R 5 and R 6 each represents an alkyl group or an alkylbenzene group having 3 or more carbon atoms or a benzene group.
Claim 6
Dependent Claim
31 words
The process for preparing a negative image of high contrast as claimed in claim 4, wherein the compound of formula (B) is selected from sodium p-toluenesulfonate, sodium benzenesulfonate and sodium 1-hexane-sulfonate.
Claim 7
Dependent Claim
37 words
The process for preparing a negative image of high contrast as claimed in claim 4, wherein the compound of formula (C) is selected from sodium benzoate, sodium p-toluene, potassium isobutyrate, sodium n-caproate, sodium n-caprylate and sodium n-caprate.
Claim 8
Dependent Claim
36 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein the compound of formula (A) is used in an amount of from 0.01 to 0.30 mole per liter of developer.
Claim 9
Dependent Claim
37 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein the compound of formula (A) is used in an amount of from 0.01 to 0.20 mole per liter of the developer.
Claim 10
Dependent Claim
38 words
The process for preparing a negative image of high contrast as claimed in claim 4, wherein the amount of the compound of formula (B) or (C) to be added to a developer is 0.005 mole/liter (developer) or more.
Claim 11
Dependent Claim
47 words
The process for preparing a negative image of high contrast as claimed in claim 9, wherein the amount of the compound of formula (B) or (C) to be added to a developer is from 0.03 to 0.1 mole per mole of the amino compound of formula (A).
Claim 12
Dependent Claim
51 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein said dihydroxybenzene-type developing agent is represented by the following formula (D) ##STR8## wherein X and Y each represents a hydrogen atom, a halogen atom or an alkyl group having from 1 to 5 carbon atoms.
Claim 13
Dependent Claim
32 words
The process for preparing a negative image of high contrast as claimed in claim 11, wherein said dihydroxybenzene-type developing agent is selected from hydroquinone, chlorohydroquinone, bromohydroquinone, isopropylhydroquinone, methylhydroquinone, 2,3-dichlorohydroquinone, 2,3-dibromohydroquinone and 2,5-dimethylhydroquinone.
Claim 14
Dependent Claim
37 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein said dihydroxybenzene-type developing agent is used together with an auxiliary developing agent selected from p-aminophenol-type developing agents and 3-pyrazolidone-type developing agents.
Claim 15
Dependent Claim
35 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein said sulfite preservative is selected from sodium sulfite, potassium sulfite, lithium sulfite, sodium bisulfite, potassium metabisulfite and formaldehyde-sodium bisulfite.
Claim 16
Dependent Claim
160 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein said hydrazine derivative is selected from compounds of a formula (I) ##STR9## in which A represents an aliphatic group or an aromatic group which contain or does not contain a ballast group or a adsorption-accelerating group; B represents a formyl group, an acyl group, an alkyl- or aryl-sulfonyl group, an alkyl- or arylsulfinyl group, a carbamoyl group, a sulfamoyl group, an alkoxy- or aryloxycarbonyl group, a sulfinamoyl group, an alkoxysulfonyl group, a thioacyl group, a thiocarbamoyl group or a heterocyclic group; R 0 and R 1 both represent hydrogen atom, or one of them represents a hydrogen atom, and the other represents a substituted or unsubstituted alkylsulfonyl group, a substituted or unsubstituted arylsulfonyl group or a substituted or unsubstituted acyl group; as the case may be, B, R 1 and the nitrogen atoms bonded thereto may form a partial structure (--N═C<) of a hydrazone.
Claim 17
Dependent Claim
38 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein the hydrazine derivative is used in an amount of from 10 -6 mole to 1×10 -1 mole per mole of silver halide.
Claim 18
Dependent Claim
36 words
The process for preparing a negative image of high contrast as claimed in claim 1, wherein the hydrazine derivative is used in an amount of from 5 mg to 5 g per liter of the developer.
References Cited (Backward Citations)
US29111A
Cited
US2388816A
Cited
USRE29111E
Cited
US4298673A
Cited
US4224401A
Cited
US4232112A
Cited
US4269929A
Cited
EP0032456B1
Cited
GB2077453A
Cited
EP0164120A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |