US4301240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide material with cross-linked particulate acrylic or methacrylic polymer
Assignee: Agfa Gevaert AG
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Filing: 1978-12-28
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Granted: 1981-11-17
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Expires: 1998-12-28
Abstract
Abstract Photographic silverhalide containing materials having improved mechanical and electrostatic properties are obtained by adding to at least one of the layers of the material a cross-linked polymer of acrylic acid and/or methacrylic acid which is prepared either (a) by inverse emulsion polymerization of acrylic and/or methacrylic acid monomers in the presence of polyfunctional cross-linking monomers and an emulsifier and breaking of the emulsion and redispersion of the polymer particles in water; or (3) by emulsion polymerization of aliphatic esters of acrylic and/or methacrylic acid in water in the presence of polyfunctional cross-linking monomers and of an emulsifier, followed by saponification of the polymer.
Inventors
- 👤 Rolf Bruck
- 👤 Erich Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; C; C08; C08F; C08F2/00; C08F2/32; G03C1/005; G03C1/04; G03C1/053; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
A photographic light sensitive material having at least one silver halide emulsion layer, characterized in that at least one of the layers other than a layer containing silver halide, contains an additive insoluble in photographic processing consisting of a cross-linked polymer of acrylic acid or methacrylic acid which has a particle size in the dry state of from 0.01 to 5μ and a swelling factor in water limited to from 4 to 40, which polymer was prepared by crosslinking in covalent bonds either: (a) by inverse emulsion polymerization (water-in-oil) of 75% to 95% by weight acrylic or methacrylic acid monomers in the presence of water-soluble polyfunctional cross-linking monomers and an emulsifier, breaking down of the emulsion and redispersion of the polymer particles in water; or (b) by emulsion polymerization of short chained aliphatic esters or acrylic or methacrylic acid in water in the presence of unsaponifiable and substantially water insoluble polyfunctonal cross-linking monomers and an emulsifier, followed by saponification of the polymer, said particles being resistant to diffusion.
Claim 2
Dependent Claim
168 words
A photographic light sensitive material having at least one silver halide emulsion layer, characterized in that at least one of the layers other than a layer containing silver halide, contains an additive insoluble in photographic processing consisting of a cross-linked polymer of acrylic acid or methacrylic acid which has a particle size in the dry state of from 0.01 to 5μ and a swelling factor in water limited to from 4 to 40, which polymer was prepared by crosslinking in covalent bonds either: (a) by inverse emulsion polymerization (water-in-oil) of 75% to 95% by weight acrylic or methacrylic acid monomers in the presence of water-soluble polyfunctional cross-linking monomers and an emulsifier, breaking down of the emulsion and redispersion of the polymer particles in water; or (b) by emulsion polymerization of short chained aliphatic esters or acrylic or methacrylic acid in water in the presence of unsaponifiable and substantially water insoluble polyfunctonal cross-linking monomers and an emulsifier, followed by saponification of the polymer, said particles being resistant to diffusion.
Claim 3
Dependent Claim
51 words
A material according to claim 1, characterized in that polymer particles measuring from 1 to 3μ and having a swelling factor of from 8 to 40, are contained in an outer gelatine-containing layer in a quantity of from 5 to 30% by weight, based on the dry weight of the layer.
Claim 4
Dependent Claim
49 words
A material according to claim 1, characterized in that polymer particles measuring from 1 to 3μ and having a swelling factor of from 8 to 40, dispersed in a back layer in a quantity of from 25 to 70% by weight, based on the dry weight of the layer.
Claim 5
Dependent Claim
51 words
A material according to claim 1, characterized in that polymer particles measuring from 0.01 to 0.3μ, and having a swelling factor of from 3 to 14, are contained in an outer gelatine-containing layer in a quantity of from 25 to 50% by weight, based on the dry weight of the layer.
Claim 6
Dependent Claim
58 words
A material according to claim 1, characterized in that polymer particles measuring from 0.01 to 0.3μ and having a swelling factor of from 3 to 14 dispersed in a synthetic organic polymer as binder are contained in a back layer in a quantity of from 25 to 70% by weight, based on the dry weight of the layer.
Claim 7
Dependent Claim
27 words
A material according to claims 2, 3 or 5, characterized in that the layer containing the polymer particles has a pH value of from 7 to 10.
Claim 8
Dependent Claim
19 words
A material as claimed in claim 1 wherein the polymer particles have a particle size from 0.03 to 2μ.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |