Patent EP0354532A2 successfully refreshed from Google Patents.
EP0354532A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photographic element and process
Assignee: Eastman Kodak Co
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Filing: 1989-08-08
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Granted: —
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Expires: 2009-08-08
Abstract
Abstract A compound (I) having a carrier moiety (CAR) and a releasable development inhibitor moiety (INH) capable of being released during photographic processing by means of at least one timing group (T) bonded to and releasable from the carrier moiety provides improved images in a photographic silver halide element and process when the inhibitor moiety (INH) comprises (R') a non-aromatic, sterically hindered substituent group having (a) a tertiary carbon atom bonded directly to the releasable development inhibitor moiety or (b) a secondary carbon atom bonded directly to the releasable development inhibitor moiety and wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms. Such compounds, particularly as couplers, are useful in photographic silver halide materials and processes to provide improved acutance and interimage effects.
Inventors
- 👤 Richard Peter C/O Eastman Kodak Company Szajewski
- 👤 Jerrold Neal C/O Eastman Kodak Company Poslusny
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:53
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C07D255/00; C07D255/02; C07D255/04; C07D271/00; C07D271/02; C07D271/10; C07D271/113; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30541
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A photographic silver halide element comprising a support bearing at least one silver halide emulsion layer and in or adjacent the emulsion layer at least one compound (I) having a carrier moiety (CAR) and a releasable development inhibitor (INH) capable of being released during photographic processing of the element by means of at least one timing group (T) bonded to and releasable from the carrier moiety, wherein the releasable development inhibitor moiety (INH) comprises (R') a non-aromatic, sterically hindered substituent group having (a) a tertiary carbon atom bonded directly to the releasable development inhibitor moiety or (b) a secondary carbon atom bonded directly to the releasable development inhibitor moiety wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms; and wherein the combination of the timing group (T) and the development inhibitor (INH) enable increased acutance and interimage effects upon exposure and processing of the element.
Claim 2
Dependent Claim
155 words
A photographic silver halide element comprising a support bearing at least one silver halide emulsion layer and in or adjacent the emulsion layer at least one compound (I) having a carrier moiety (CAR) and a releasable development inhibitor (INH) capable of being released during photographic processing of the element by means of at least one timing group (T) bonded to and releasable from the carrier moiety, wherein the releasable development inhibitor moiety (INH) comprises (R') a non-aromatic, sterically hindered substituent group having (a) a tertiary carbon atom bonded directly to the releasable development inhibitor moiety or (b) a secondary carbon atom bonded directly to the releasable development inhibitor moiety wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms; and wherein the combination of the timing group (T) and the development inhibitor (INH) enable increased acutance and interimage effects upon exposure and processing of the element.
Claim 3
Dependent Claim
121 words
A photographic element as claimed in claim 1 comprising a support bearing at least one silver halide emulsion layer and in or adjacent the emulsion layer at least one compound (I) having a carrier moiety (CAR) and a releasable development inhibitor (INH) capable of being released during photographic processing of the element by an intramolecular nucleophilic displacement reaction, wherein the releasable development inhibitor moiety (INH) comprises (R') a non-aromatic, sterically hindered substituent group having (a) a tertiary carbon atom bonded directly to the releasable development inhibitor moiety or (b) a secondary carbon atom bonded directly to the releasable development inhibitor moiety and wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms.
Claim 4
Dependent Claim
163 words
A photographic element as claimed in claim 1 wherein the compound (I) having a carrier moiety is represented by the formula: CAR-Nu-X-E-INH-R' wherein CAR is a carrier moiety: INH is a development inhibitor moiety containing at least one hetero atom; Nu is a nucleophilic group attached to CAR at a position from which it is capable of being displaced as a result of reaction of CAR with oxidized color developing agent: X is a linking group spatially relating Nu and E, upon displacement of Nu from CAR, enabling an intramolecular nucleophilic displacement reaction that cleaves the bond between INH and E; E is an electrophilic group attached to a hetero atom in INH; and R' is a non-aromatic, sterically hindered sub stituent group having a) a tertiary carbon atom bonded directly to INH; or b) a secondary carbon atom bonded directly to INH and wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms.
Claim 5
Dependent Claim
20 words
A photographic element as claimed in claim 1 wherein the non-aromatic, sterically hindered substituent group is a tertiary alkyl group.
Claim 6
Dependent Claim
17 words
A photographic element as claimed in claim 1 wherein the carrier moiety (CAR) is a dye-forming coupler.
Claim 7
Dependent Claim
17 words
A photographic element as claimed in claim 1 wherein the releasable development inhibitor (INH) comprising R' is:
Claim 8
Dependent Claim
26 words
A photographic element as claimed in any of claims 1 - 6 wherein the compound (I) having a carrier moiety is represented by the formula: or
Claim 9
Dependent Claim
71 words
A photographic element as claimed in any of claims 1 - 7 comprising a red-sensitive silver halide emulsion unit having associated therewith a cyan dye image-forming material, a green-sensitive silver halide emulsion unit having associated therewith a magenta dye image-forming material, and a blue-sensitive silver halide emulsion layer unit having associated therewith a yellow dye image-forming material, and wherein said compound (I) is associated with at least one of said units.
Claim 10
Dependent Claim
47 words
A process of forming a photographic color image which comprises developing an exposed photographic silver halide emulsion layer with a color developing agent in the presence of a dye image-forming coupler in the presence of a compound (I) as defined in any of claims 1 - 7.
Claim 11
Dependent Claim
21 words
A photographic development inhibitor releasing coupler or compound comprising a compound (I) as defined in any of claims 1 - 7.
References Cited (Backward Citations)
No citation records indexed.
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