US4294916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide material containing a dye filter or a dye anti-halation layer
Assignee: Ilford Imaging UK Ltd
•
Filing: 1980-04-30
•
Granted: 1981-10-13
•
Expires: 2000-04-30
Abstract
Abstract A photographic silver halide material is provided which comprises in at least one layer a solid dispersion of at least one water-insoluble methine dye of the formula ##STR1## wherein L and L' each represent an optionally substituted methine group, n is O, 1 or 2, Z represents the atoms necessary to complete an optionally substituted acidic carbocyclic or heterocyclic ring, Y represents the atoms necessary to complete an optionally substituted basic carbocyclic or heterocyclic ring, at least one of the rings Z and Y being substituted by a --COOH group or being substituted by a group which comprises a --COOH group. The solid dispersion of the dye is finely divided in the binder material of said layer, which is normally a filter or anti-halation layer. A marked increase of sharpness of the images obtained from photographic material containing in at least one layer the solid dyestuff dispersion can be observed.
Inventors
- 👤 Stephen R. Postle
- 👤 Alexander Psaila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:10
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
Photographic silver halide material which comprises in at least one layer a solid dispersion of at least one water-insoluble dye of the general formula ##STR14## wherein L and L' each represent an optionally substituted methine group, n is 0, 1 or 2, Z represents the atoms necessary to complete an optionally substituted pyrazolone, hydroxypyridone, barbiturate, thiobarbiturate, dimedone or indan-1, 3-dione, Y represents the atoms necessary to complete an optionally substituted benzimidazole, benzoxazole, benzthiazole, benzselenazole, indole, lepidinole or quinole, at least one of the rings Z and Y being substituted by a --COOH group or being substituted by a group which comprises a --COOH group, in a binder.
Claim 2
Dependent Claim
107 words
Photographic silver halide material which comprises in at least one layer a solid dispersion of at least one water-insoluble dye of the general formula ##STR14## wherein L and L' each represent an optionally substituted methine group, n is 0, 1 or 2, Z represents the atoms necessary to complete an optionally substituted pyrazolone, hydroxypyridone, barbiturate, thiobarbiturate, dimedone or indan-1, 3-dione, Y represents the atoms necessary to complete an optionally substituted benzimidazole, benzoxazole, benzthiazole, benzselenazole, indole, lepidinole or quinole, at least one of the rings Z and Y being substituted by a --COOH group or being substituted by a group which comprises a --COOH group, in a binder.
Claim 3
Dependent Claim
26 words
Photographic silver halide material according to claim 1 wherein the dye of formula (1) n is 1 or 2 and both L and L' are --CH═.
Claim 4
Dependent Claim
175 words
Photographic silver halide material according to claim 1 wherein the water-insoluble dye is of the formula ##STR15## where n 1 is 1 or 2 and Y has the meaning assigned to it in claim 1, R 1 represents a hydrogen atom or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or an optionally substituted amino group, R 2 represents a hydrogen atom or a hydroxy, amino, --CN, --COOR 1 , --CONR 1 R 2 or --COR 1 group or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, and R 3 represents a hydrogen atom or a --CN, --COOR 3 , --CONR 3 R 4 , --SO 3 H, --SO 3 - or --COR 3 group, where R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical and at least one of the hydroxypyridone or Y rings being substituted by a --COOH group or being substituted by a group which comprises a --COOH group.
Claim 5
Dependent Claim
50 words
Photographic silver halide material according to claim 1 wherein the water-insoluble dye is of the formula ##STR16## where n 1 is 1 or 2 and Y has the meaning assigned to it in claim 1 and R 6 is a hydrogen atom or an optionally substituted alkyl or aryl group.
Claim 6
Dependent Claim
88 words
Photographic silver halide material according to claim 3 wherein n is 1 and Y is a ring system of the formula ##STR17## wherein R 7 is either --O--, --S--, --Se-- or CR 9 R 10 where R 9 and R 10 are each hydrogen atoms or lower alkyl groups, or --NR 11 -- where R 11 is a hydrogen atom or a lower alkyl group and R 8 is a hydrogen atom, a lower alkyl group or a --COOH group, there being at least one --COOH group present.
Claim 7
Dependent Claim
49 words
Photographic silver halide material according to claim 5, wherein R 7 is --O--, --CR 9 R 10 -- or --NR 11 , wherein R 11 is hydrogen, methyl or ethyl, R 8 is hydrogen, methyl or ethyl and R 9 and R 10 are each hydrogen, methyl or ethyl.
Claim 8
Dependent Claim
13 words
Photographic silver halide material according to claim 1 wherein the binder is gelatin.
Claim 9
Dependent Claim
23 words
Photographic silver halide material according to claim 1 wherein the layer which comprises the solid dispersion of the dye is an anti-halation underlayer.
References Cited (Backward Citations)
US3481927A
Cited
US3480436A
Cited
US3471293A
Cited
US3540888A
Cited
US3560214A
Cited
GB1278621A
Cited
GB1338799A
Cited
DE2520834A1
Cited
DE2639366A1
Cited
GB2002916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |