US4013468A
Expired / Lapsed
US
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Method of hardening a protein-containing layer of a silver halide photographic material with an alkyl ester of 1,2-dihydroquinoline-N-carboxylic acid
Assignee: Agfa Gevaert AG
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Filing: 1974-06-20
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Granted: 1977-03-22
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Expires: 1994-06-20
Abstract
Abstract A process for hardening protein-containing, preferably gelatin-containing, photographic layers wherein as hardeners unsubstituted or substituted esters of 2-substituted, 1,2-dihydroquinoline-N-carboxylic acids and/or unsubstituted or substituted esters of 1-substituted 1,2-dihydroisoquinoline-N-carboxylic acids are used.
Inventors
- 👤 Peter Bergthaller
- 👤 Wolfgang Himmelmann
- 👤 Karl-Wilhelm Schranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:49
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22; C07D215/227; C07D215/24; C07D215/26; C07D215/36; C07D217/00; C07D217/22; C07D217/24; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
The method of hardening a light sensitive silver halide material having at least one layer which contains at least in part a protein-containing hydrophilic binder by contacting the protein-containing hydrophilic binder with an effective amount of a hardening compound to cause a crosslinking reaction of the protein molecules in the binder the improvement according to which the hardening compound is an alkyl ester of carboxylic acid selected of 1,2-dihydroquinoline-N-carboxylic acid and 1,2-dihydroisoquinoline-N-carboxylic acid, the 1,2-dihydroquinoline nucleus of which being alkoxy substituted in its 2-position and the 1,2-dihydroisoquinoline nucleus of which being alkoxy substituted in its 1-position.
Claim 2
Independent Claim
96 words
The method of hardening a light sensitive silver halide material having at least one layer which contains at least in part a protein-containing hydrophilic binder by contacting the protein-containing hydrophilic binder with an effective amount of a hardening compound to cause a crosslinking reaction of the protein molecules in the binder the improvement according to which the hardening compound is an alkyl ester of carboxylic acid selected of 1,2-dihydroquinoline-N-carboxylic acid and 1,2-dihydroisoquinoline-N-carboxylic acid, the 1,2-dihydroquinoline nucleus of which being alkoxy substituted in its 2-position and the 1,2-dihydroisoquinoline nucleus of which being alkoxy substituted in its 1-position.
Claim 3
Independent Claim
124 words
The method of hardening a light sensitive silver halide material having at least one layer which contains at least in part a protein-containing hydrophilic binder by contacting the protein-containing binder hydrophilic with an effective amount of a hardening compound to cause a cross-linking reaction of the protein molecules in the binder the improvement according to which the hardening compound used is a compound of the following formulae: ##SPC4## wherein R 1 represents an alkyl group containing up to 4 carbon atoms, R 2 represents an alkyl group containing up to 4 carbon atoms or a benzyl group or, when R 3 represents H, R 2 represents the group ##SPC5## R 3 represents hydrogen, halogen, alkyl or alkoxy and R 4 represents an alkyl group.
Claim 4
Independent Claim
124 words
The method of hardening a light sensitive silver halide material having at least one layer which contains at least in part a protein-containing hydrophilic binder by contacting the protein-containing binder hydrophilic with an effective amount of a hardening compound to cause a cross-linking reaction of the protein molecules in the binder the improvement according to which the hardening compound used is a compound of the following formulae: ##SPC4## wherein R 1 represents an alkyl group containing up to 4 carbon atoms, R 2 represents an alkyl group containing up to 4 carbon atoms or a benzyl group or, when R 3 represents H, R 2 represents the group ##SPC5## R 3 represents hydrogen, halogen, alkyl or alkoxy and R 4 represents an alkyl group.
Claim 5
Dependent Claim
25 words
Method according to claim 2 characterised by using a compound in which R 3 represents a hydrogen atom and R 1 represents methyl or ethyl.
Claim 6
Dependent Claim
15 words
Method according to claim 2, characterised in that the hardeners are contacted from aqueous solution.
Claim 7
Dependent Claim
15 words
Method according to claim 2, characterised in that the hardeners are contacted from alcoholic solution.
Claim 8
Dependent Claim
15 words
Method according to claim 2, characterised in that the hardeners are contacted from aqueous-alcoholic solution.
Claim 9
Dependent Claim
37 words
Method according to claim 2, characterised in that the hardeners are used in quantities of 0.5-5% by weight, based on the weight of the binder in a casting solution of the layer which is to be hardened.
Claim 10
Dependent Claim
26 words
Method according to claim 2, characterised in that the hardeners are applied as 0.2 - 10% solutions used as prehardening bath before the material is processed.
Claim 11
Dependent Claim
27 words
Method according to claim 2, characterised in that the layer which is to be hardened is coated with a 0.2-5% solution of the hardener and then dried.
Claim 12
Dependent Claim
17 words
The method as claimed in claim 1 wherein the photographic material is a multi-layered color photographic material.
Claim 13
Dependent Claim
21 words
The method as claimed in claim 2 wherein the binder is selected from the group consisting of gelatin, casein and zein.
References Cited (Backward Citations)
US3389142A
Cited
US3452140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |