US4603102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide recording material with cellulose dicarboxylic acid semiester particles in outer layer
Assignee: Agfa Gevaert AG
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Filing: 1985-06-26
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Granted: 1986-07-29
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Expires: 2005-06-26
Abstract
Abstract The photographic silver halide recording material contains particles of a hydroxyalkyl-alkyl cellulose dicarboxylic acid semiester having a particle size of from 0.5 to 8 μm and a particle size distribution of up to ±2 μm dispersed in a hydrophilic colloid in at least one of its outermost layers.
Inventors
- 👤 Wolfgang Himmelmann
- 👤 Fritz Nittel
- 👤 Rudolf Meyer
- 👤 Lothar Rosenhahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
Photographic silver halide recording material in which particles smaller than 10 μm which are soluble in alkaline processing liquids are contained, dispersed in a hydrophilic colloid, in an outer transparent layer applied to the front and/or back of the material, characterised in that the layer contains, dispersed therein, from 10 to 500 mg/m 2 of spherical transparent particles of a hydroxyalkyl-alkyl cellulose dicarboxylic acid semiester having a particle size of from 0.5 to 8 μm and a particle size distribution of up to ±2 μm.
Claim 2
Dependent Claim
85 words
Photographic silver halide recording material in which particles smaller than 10 μm which are soluble in alkaline processing liquids are contained, dispersed in a hydrophilic colloid, in an outer transparent layer applied to the front and/or back of the material, characterised in that the layer contains, dispersed therein, from 10 to 500 mg/m 2 of spherical transparent particles of a hydroxyalkyl-alkyl cellulose dicarboxylic acid semiester having a particle size of from 0.5 to 8 μm and a particle size distribution of up to ±2 μm.
Claim 3
Dependent Claim
95 words
Material according to claim 1, characterised in that it contains a hydroxyalkyl-alkyl cellulose dicarboxylic acid semi-ester containing the group R.sub.m.sup.1 R.sub.n.sup.2 R.sub.p.sup.3 A wherein A denotes a glucose residue of the cellulose, R 1 denotes a hydroxyalkyl group having 2 to 4 carbon atoms, R 2 denotes an alkyl group having 1 to 3 carbon atoms, R 3 denotes the monoacyl group of a benzene dicarboxylic acid or of such an acid in a partially or completely hydrogenated form, m=0.2-1.0, n=0.8-2.0 and p=0.5-1.5, where m≠n≠p and the sum of m+n+p is at the most 3.
Claim 4
Dependent Claim
26 words
Material according to claim 1, characterised in that the hydroxyalkyl-alkyl cellulose dicarboxylic acid semi-ester is a hydroxypropyl-methyl cellulose-hexahydrophthalic acid semiester or a hydroxypropyl-methyl cellulose-phthalic acid semiester.
Claim 5
Dependent Claim
47 words
Material according to claims 1 or 2, characterised in that the layer in addition contains colloidal silica with a particle size of less than 0.15 μm in a quantity of from 0.5 to 2 parts by weight, based on 1 part by weight of the hydrophilic colloid.
Claim 6
Dependent Claim
57 words
Material as in any one of claims 1 to 3, characterised in that the layer in addition contains particles of a homo- or copolymer having a glass transition temperature of at least 40° C. and a particle size of less than 0.1 μm, in a quantity of up to 50% by weight, based on the hydrophilic colloid.
References Cited (Backward Citations)
US4514131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |