Patent US2793258A successfully refreshed from Google Patents.
EP0155690A2
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EP
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Process for forming high contrast negative image
Assignee: Fujifilm Holdings Corp
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Filing: 1985-03-21
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Granted: —
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Expires: 2005-03-21
Abstract
Abstract A process for forming a high contrast negative image by developing an exposed substantial surface latent image type silver halide photographic light-sensitive material in the presence of hydrazines, which comprises using a developing solution having a pH value of 10.5 to 12.3 and containing at least (1) a developing agent, (2) 0.25 mol/f or more of sulfite, and (3) a compound represented by the following general formula (I): wherein R 1 , R 2 , R 3 , R 4 and R 5 , which may be the same or different, each represents a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group or a substituted alkyl group. According to the process, the development processing time required is shortened in the case of forming a high contrast negative image with a stable developing solution using hydrazines.
Inventors
- 👤 Eiichi Okutsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:46
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/30; G03C5/3014; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A process for forming a high contrast negative image by developing an exposed substantial surface latent image type silver halide photographic light-sensitive material in the presence of hydrazines, which comprises using a developing solution having a pH value of 10.5 to 12.3 and containing at least (1) a developing agent, (2) 0.25 mol/ℓ or more of sulfite, and (3) a compound represented by general formula (I) : wherein R 1 , R 2 , R 3 , R 4 and R 5 , which may be the same or different, each represents a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group or a substituted alkyl group.
Claim 2
Dependent Claim
109 words
A process for forming a high contrast negative image by developing an exposed substantial surface latent image type silver halide photographic light-sensitive material in the presence of hydrazines, which comprises using a developing solution having a pH value of 10.5 to 12.3 and containing at least (1) a developing agent, (2) 0.25 mol/ℓ or more of sulfite, and (3) a compound represented by general formula (I) : wherein R 1 , R 2 , R 3 , R 4 and R 5 , which may be the same or different, each represents a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group or a substituted alkyl group.
Claim 3
Dependent Claim
27 words
A process according to Claim 1, wherein the developing solution contains the compound represented by general formula (I) in an amount of 0.005 mol/ℓ to 0.50 mol/ℓ.
Claim 4
Dependent Claim
52 words
A process according to Claim 1, wherein the alkyl group of general formula (I) has 4 or less carbon atoms; the alkoxy group of general formula (I) has 4 or less carbon atoms in the alkyl moiety; and the substituted alkyl group has 4 or less carbon atoms in the alkyl moiety.
Claim 5
Dependent Claim
80 words
A process according to Claim 1, wherein the hydrazines are compounds represented by general formula (II) wherein R 6 represents an aliphatic group or an aromatic group, R 7 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryloxy group, and G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group or an N-substituted or unsubstituted imino group.
Claim 6
Dependent Claim
24 words
A process according to Claim 1, wherein the hydrazines are included in the developing solution in an amount of 5 mg/Z to 5 g/ℓ.
Claim 7
Dependent Claim
44 words
A process according to Claim 1, wherein the hydrazines are included in an emulsion layer or an adjacent hydrophilic colloid layer of the silver halide photographic light-sensitive material in an amount of 10 -6 mol to 5×10 -2 mol per mol of silver halide.
Claim 8
Dependent Claim
12 words
A process according to Claim 1, wherein the developing agent contains dihydroxybenzenes.
Claim 9
Dependent Claim
16 words
A process according to Claim 1, wherein the developing agent contains combinations of dihydroxybenzenes and 1-phenyl-3-pyrazolidones.
Claim 10
Dependent Claim
21 words
A process according to Claim 1, wherein the developing agent is used in an amount of 0:05 mol/ℓ to 0.8 mol/ℓ.
References Cited (Backward Citations)
No citation records indexed.
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