Patent US4287299A successfully refreshed from Google Patents.
US4287299A
Expired / Lapsed
US
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Process for the production of matting layers
Assignee: Agfa Gevaert AG
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Filing: 1980-05-13
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Granted: 1981-09-01
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Expires: 2000-05-13
Abstract
Abstract For the production of matted outer layers of photographic silver halide recording materials particles of a copolymer of maleic acid anhydride and a C 2 -C 8 monoolefin are dispersed in an aqueous solution of a hydrophilic colloid and the dispersion thus formed is applied to one or both surfaces of the photographic recording material and the layer is dried.
Inventors
- 👤 Wolfgang Himmelmann
- 👤 Rolf Bruck
- 👤 Wolfgang Sauerteig
- 👤 Peter Kruck
- 👤 Gunter Kolb
- 👤 Gunter Sackmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:53
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
147 words
In a process for producing photographic material having a supported layer containing particles of a narrow grain size distribution, stable in alkaline solutions to provide a matt surface, the steps of providing a dispersion for the layer comprising, providing a layer cast as a surface layer of the photographic material, including casting as the surface layer a composition consisting essentially of a hydrophilic colloid and 1-15% by weight of the dispersion polymer particles dispersed in the colloid, said polymer dispersion being obtained by forming a finally divided copolymer suspension of spherical particles of a substantially alternating and equimolecular grouped suspension copolymer of maleic acid anhydride and C 2 -C 8 monoolefin having a particle size from 1 to 10μ dispersing said particles in a aqueous solution of a hydrophilic colloid in a quantity of from 1 to 15% by weight, based on the weight of the dispersion.
Claim 2
Dependent Claim
147 words
In a process for producing photographic material having a supported layer containing particles of a narrow grain size distribution, stable in alkaline solutions to provide a matt surface, the steps of providing a dispersion for the layer comprising, providing a layer cast as a surface layer of the photographic material, including casting as the surface layer a composition consisting essentially of a hydrophilic colloid and 1-15% by weight of the dispersion polymer particles dispersed in the colloid, said polymer dispersion being obtained by forming a finally divided copolymer suspension of spherical particles of a substantially alternating and equimolecular grouped suspension copolymer of maleic acid anhydride and C 2 -C 8 monoolefin having a particle size from 1 to 10μ dispersing said particles in a aqueous solution of a hydrophilic colloid in a quantity of from 1 to 15% by weight, based on the weight of the dispersion.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1, characterised in that from 0.1 to 1% by weight, based on the weight of the water contained in the dispersion, of a surface-active substance is added to the dispersion before casting.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1, characterised in that gelatin is used as the hydrophilic colloid.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1, characterised in that a copolymer of diisobutylene and maleic acid anhydride (1:1 mole) is used.
Claim 6
Dependent Claim
58 words
A process as claimed in claim 1, characterised in that colloidal silica in the form of a hydrosol having a particle size of from 1 to 15 nm is added to the dispersion before casting in a quantity of from 0.5 to 2 parts by weight of colloidal silica particles per part by weight of the hydrophilic colloid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |