EP0345025A1
Expired / Lapsed
EP
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High contrast photographic recording material and emulsion and process for their development
Assignee: Eastman Kodak Co
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Filing: 1989-05-31
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Granted: —
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Expires: 2009-05-31
Abstract
Abstract A photographic recording material and emulsion are described which are capable of providing high contrast images. The recording material and emulsion comprises negative working silver halide and contrast enhancing arylhydrazide nucleating agents of the formula. wherein: R is a substituted or unsubstituted alkyl having from 1 to 8 carbon atoms or a substituted or unsubstituted cycloalkyl having from 4 to 8 carbon atoms in the ring.
Inventors
- 👤 Harold Ihor C/O Eastman Kodak Company Machonkin
- 👤 Lee Joseph C/O Eastman Kodak Company Fleckenstein
- 👤 Donald Laurens C/O Eastman Kodak Company Kerr
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061; C; C07; C07C; C07C323/00; C07C323/50; C07C323/51; C07C323/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A photographic recording material capable of providing a high contrast silver image which comprises a support having thereon a negative-working silver halide emulsion layer and a hydrazide compound characterized in that the compound has the following structural formula: wherein: R is a substituted or unsubstituted alkyl having from 1 to 8 carbon atoms or a substituted or unsubstituted cycloalkyl having from 4 to 8 carbon atoms in the ring.
Claim 2
Dependent Claim
69 words
A photographic recording material capable of providing a high contrast silver image which comprises a support having thereon a negative-working silver halide emulsion layer and a hydrazide compound characterized in that the compound has the following structural formula: wherein: R is a substituted or unsubstituted alkyl having from 1 to 8 carbon atoms or a substituted or unsubstituted cycloalkyl having from 4 to 8 carbon atoms in the ring.
Claim 3
Dependent Claim
17 words
The photographic recording material of claim 1 characterized in that R is a branched chain alkyl group.
Claim 4
Dependent Claim
24 words
The photographic recording material of claim 1 or 2 characterized in that R is an alkyl group having from 4 to 8 carbon atoms.
Claim 5
Dependent Claim
33 words
The photographic recording material of any claims 1-3 characterized in that the R alkyl or cycloalkyl group is substituted with halogen, amino, OH, SH or alkyl comprising from 1 to 3 carbon atoms.
Claim 6
Dependent Claim
31 words
The photographic recording material of any of claims 1-4 characterized in that the hydrazide compound is present in an amount of from 10⁻⁴ to 10⁻¹ mol thereof per mol of silver.
Claim 7
Dependent Claim
34 words
The photographic recording material of claim characterized in that the hydrazide compound is present in an amount of from about 5 x 10⁻⁴ to about 5 x 10⁻² mol thereof per mol of silver.
Claim 8
Dependent Claim
20 words
The photographic recording material of claim 1 characterized in that the hydrazide compound has one of the following structural formulae:
Claim 9
Dependent Claim
29 words
A photographic emulsion comprising negative working silver halide and a hydrazide nucleating compound characterized in that the hydrazide compound is as defined in any of Claims 1-4 or 7.
Claim 10
Dependent Claim
28 words
The photographic emulsion of claim 8 characterized in that the hydrazide compound is present in an amount of from 10⁻⁴ to 10⁻¹ mol thereof per mol of silver.
Claim 11
Dependent Claim
32 words
The photographic emulsion of claim 9 characterized in that the hydrazide compound is present in an amount of from 5 x 10⁻⁴ to 5 x 10⁻² mol thereof per mol of silver.
References Cited (Backward Citations)
GB2097140A
Cited
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