EP0035698A2
Expired / Lapsed
EP
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Novel dyestuffs and their use in photographic material
Assignee: Novartis AG
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Filing: 1981-02-25
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Granted: —
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Expires: 2001-02-25
Abstract
Abstract The new compounds of the general formula where R 1 is hydrogen, alkyl or cyclic alkyl, R 2 and R 3 are each hydrogen, alkyl, a carboxylic acid, ester or amide group or cyano, and R.. R s and R 6 are each alkyl or aryl, are useful as antihalation dyes and as image dyes in photographic materials for dye-bleaching processes.
Inventors
- 👤 William Edward Long
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:01
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/16; C09B23/162; C09B23/164; G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A dyestuff of the formula where R 1 is hydrogen, optionally substituted alkyl or cyclic alkyl, R 2 and R 3 are each hydrogen, optionally substituted alkyl, a carboxylic acid, ester or amide group, or cyano, and R 4 , R 5 and R 6 are each optionally substituted alkyl or optionally substituted aryl.
Claim 2
Dependent Claim
54 words
A dyestuff of the formula where R 1 is hydrogen, optionally substituted alkyl or cyclic alkyl, R 2 and R 3 are each hydrogen, optionally substituted alkyl, a carboxylic acid, ester or amide group, or cyano, and R 4 , R 5 and R 6 are each optionally substituted alkyl or optionally substituted aryl.
Claim 3
Dependent Claim
89 words
A dyestuff according to claim 1, where R is hydrogen, optionally substituted alkyl having from 1 to 12 carbon atoms or cyclic alkyl having 5 or 6 ring-members, R 2 and R 3 are each hydrogen, optionally substituted alkyl having 1 to 8 carbon atoms, a carboxylic acid group, a carboxylic ester group having 2 to 5 carbon atoms, a carboxylic amide group or cyano, and R 4 , R 5 and R 6 are each optionally substituted alkyl having 1 to 6 carbon atoms or optionally substituted aryl.
Claim 4
Dependent Claim
39 words
A dyestuff according to claim 2 where R 1 is hydrogen, alkyl having from 2 to 10 carbon atoms optionally substituted by halogen, hydroxyl, alkoxy having 1 to 4 carbon atoms or a carboxylic acid group; cyclopentyl or cyclohexyl.
Claim 5
Dependent Claim
29 words
A dyestuff according to claim 3 where R1 is alkyl having 2, 3 or 4 carbon atoms optionally substituted by hydroxyl or a carboxylic acid group, cyclopentyl or cyclohexyl.
Claim 6
Dependent Claim
51 words
A dyestuff according to claim 1 where R 2 and R 3 are each hydrogen, alkyl having 1 to 4 carbon atoms, optionally substituted by hydroxyl, a carboxylic acid group, cyano or nitro; cyano, a carboxylic acid, a carboxylic amine or a carboxylic ester group having 2 to 5 carbon atoms.
Claim 7
Dependent Claim
54 words
A dyestuff according to claim 1 where R 41 R 5 and R 6 are each alkyl having 1 to 4 carbon atoms, optionally substituted by halogen, hydroxyl, alkoxy having 1 to 4 carbon atoms, or a carboxylic acid group; or phenyl, optionally substituted by halogen, hydroxyl, cyano, nitro or a carboxylic acid group.
Claim 8
Dependent Claim
24 words
Photographic material which comprises in at least one layer thereof at least one dyestuff according to any one of the claims I to 6.
Claim 9
Dependent Claim
53 words
Process for the manufacture of a dyestuff according to claim 1 which comprises reacting a hydroxypyridone of the formula with a nitroso compound of the formula wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 have the meanings assigned to them in claim 1.
Claim 10
Dependent Claim
62 words
Process for the manufacture of a dyestuff according to claim 1 which comprises oxidising an amino compound of the formula in an aqueous alkaline solution and in the presence of a hydroxypyridone of the formula wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 have the meanings assigned to them in claim 1.
References Cited (Backward Citations)
No citation records indexed.
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