EP0253665B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Silver halide photographic lightsensitive systems
Assignee: 3M Co
•
Filing: 1987-07-16
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Granted: 1992-01-02
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Expires: 2007-07-16
Abstract
No abstract record available.
Inventors
- 👤 Kevin Peter Hall
- 👤 Andrew William Mott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061; C; C07; C07C; C07C243/00; C07C243/24; C07C243/26; C07C243/30; C07C243/32; C07C243/34; C07C243/38; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R³-NH⁴-NR⁵-G-X (I) in which: R³ represents an aryl group, one of R⁴ and R⁵ is hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl, G represents carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cyclisation reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X.
Claim 2
Dependent Claim
95 words
An emulsion as claimed in Claim 1 in which X represents in which: R⁶ to R⁹ are independently selected from H, alkyl of up to 12 carbon atoms or aryl of up to 12 carbon atoms, A represents the necessary atoms to complete a 5-or 6-membered ring which may possess substituents, Y represents OH, SH or NHR¹⁰ in which R¹⁰ is H alkyl of up to 12 carbon atoms, or aryl of up to 12 carbon atoms n is 0 or 1, m is 0 or 1 and (n + m) is 1 or 2.
Claim 3
Dependent Claim
24 words
A silver halide photographic light sensitive emulsion as claimed in Claim 2 in which A represents the necessary atoms to complete a benzene ring.
Claim 4
Dependent Claim
13 words
An emulsion as claimed in any preceding Claim in which G is C=O.
Claim 5
Dependent Claim
12 words
An emulsion as claimed in any preceding claim in which -GX represents
Claim 6
Dependent Claim
34 words
An emulsion as claimed in any preceding claim in which R³ represents a phenyl or naphthyl group either of which groups may be substituted with one or more substituents which are not electron attracting.
Claim 7
Dependent Claim
57 words
An emulsion as claimed in any preceding claim in which the hydrazine is of the formula in which: t is 0 or an integer of 1 to 3, and R¹¹ represents alkyl of up to 12 carbon atoms, alkoxy of up to 12 carbon atoms, halogen or NHCOR¹⁰ in which R¹⁰ is as defined in Claim 2.
Claim 8
Dependent Claim
18 words
An emulsion as claimed in any preceding claim in which the hydrazine of formula (I) is 1-(2'-hydroxymethylbenzoyl)2-phenyl hydrazine.
Claim 9
Dependent Claim
25 words
An emulsion as claimed in any preceding claim in which the hydrazine is present in an amount in the range 10⁻⁶ to 10⁻¹ mol/mol Ag.
Claim 10
Dependent Claim
20 words
An emulsion as claimed in any preceding claim which is a negative working surface latent image forming silver halide emulsion.
Claim 11
Dependent Claim
20 words
A photographic element, comprising a support bearing one or more layers of an emulsion as claimed in any preceding claim.
Claim 12
Dependent Claim
35 words
A method of recording an image which comprises image wise exposing an element as claimed in Claim 11 and developing the exposed element in a developer having a pH in the range 9.5 to 12.5.
Claim 13
Dependent Claim
14 words
A method as claimed in Claim 12 in which the developer comprises a dihydroxybenzene.
Claim 14
Dependent Claim
53 words
A compound of the formula: in which: p and q are independently selected from 0 or 1 such that (p + q) = 1 R¹¹ is as defined in Claim 7 M is NH₂ or OH with the proviso that when M is OH and p is zero, t is other than zero.
Claim 15
Dependent Claim
19 words
A compound as claimed in Claim 14 of the formula in which: R¹¹ is as defined in Claim 7.
References Cited (Backward Citations)
No citation records indexed.
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