US3754924A
Expired / Lapsed
US
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Photographic silver halide element with an antistatic outer layer comprising a fluorinated surfactant and a polymethacrylate matting agent
Assignee: Agfa Gevaert NV
•
Filing: 1971-05-03
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Granted: 1973-08-28
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Expires: 1991-05-03
Abstract
Abstract A photographic element is described which comprises a radiationsensitive silver halide emulsion layer and a hydrophilic colloid surface coating wherein the said surface coating comprises a fluorinated surfactant and solid water-insoluble discrete particles of a matting agent. The element has improved surface and antistatic properties.
Inventors
- 👤 Geest W De
- 👤 H Vandenabeele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
24 words
A photographic element according to claim 1, wherein the particles of said polymethylmethacrylate have a diameter of from about 1 and about 10 microns.
Claim 2
Dependent Claim
29 words
A photographic element according to claim 1, wherein at least 50 percent of the said particles have a diameter in the range of from about 4 to 7 microns.
Claim 3
Dependent Claim
35 words
A photographic element according to claim 1, wherein said matting agent is used at a total coverage per side of the support, in the range of about 10 mg to about 100 mg per sq.m.
Claim 4
Dependent Claim
98 words
A photographic element according to claim 1, wherein said fluorinated surfactant corresponds to the formula : RF - A - X wherein : RF stands for a partly or wholly fluorinated hydrocarbon chain comprising at least three fluorine atoms, A stands for a chemical bond or a bivalent hydrocarbon group including a bivalent hydrocarbon group interrupted by one or more hetero atoms or by the group -COO-, -CON(R)- or -SO2N(R)-wherein R is hydrogen or alkyl comprising from one to five C-atoms, X stands for a hydrophilic non-ionic polyoxyalkylene group, a hydrophilic anionic group selected from -SO3M, -OSO3M, -COOM,
Claim 5
Dependent Claim
50 words
A photographic element according to claim 5, wherein the sum of the number of F-atoms in the group RF plus the number of C-atoms in the fluorinated hydrocarbon group of RF and the number of C-atoms in the hydrocarbon group of A (if any) is at least equal to 10.
Claim 6
Dependent Claim
16 words
A photographic element according to claim 1, wherein the fluorinated surfactant comprises a terminal trifluormethyl group.
Claim 7
Dependent Claim
20 words
A photographic element according to claim 1, wherein said fluorinated surfactant is a perfluorocarboxylic acid in acid or salt form.
Claim 8
Dependent Claim
36 words
A photographic element according to claim 1, wherein the fluorinated surfactant is present in the said outer layer in an amount comprised between 0.1 and 2 percent by weight relative to the amount of dry colLoid.
Claim 9
Dependent Claim
18 words
A photographic element according to claim 1, wherein the hydrophilic colloid of the said outer layer is gelatin.
Claim 10
Dependent Claim
23 words
A photographic element according to claim 1, wherein the said radiation-sensitive silver halide emulsion layer is a gelatino silver halide X-ray emulsion layer.
Claim 11
Dependent Claim
46 words
A photographic element according to claim 1, wherein the said element is a double-coated X-ray film element provided at both sides of the film support with a said radiation-sensitive silver halide emulsion layer and a said hydrophilic colloid outer layer coated over the said emulsion layers.
Claim 12
Independent Claim
120 words
A method of preparing a photographic element having a radiation-sensitive silver halide emulsion layer and a hydrophilic colloid outer layer, which comprises incorporating a fluorinated surfactant into the said outer layer or into an underlying hydrophilic colloid layer from which the said fluorinated surfactant can diffuse towards the surface of said outer layer, and incorporating solid, water-insoluble discrete particles of polymethylmethacrylate into the said outer layer, said surfactant having at least one hydrophilic anionic group, hydrophilic non-ionic group or hydrophilic betaine group and one or more hydrocarbon chain(s) at least one of which is a C3 to C20 hydrophobic hydrocarbon chain, the hydrogen atoms of one or more of the said hydrocarbon chain(s) being wholly or partly replaced by fluorine.
Claim 13
Dependent Claim
20 words
A method according to claim 13, wherein said particles have a diameter comprised between about 1 and about 10 microns.
Claim 14
Dependent Claim
28 words
A method according to claim 13, wherein at least 50 percent of the said particles have a diameter in the range of about 4 to about 7 microns.
Claim 15
Dependent Claim
38 words
A method according to claim 13, wherein the said polymethylmethacrylate is incorporated in the said outer layer at a total coverage per side of support, in the range of about 10 mg to about 100 mg per sq.m.
Claim 16
Dependent Claim
97 words
A method according to claim 13, wherein said fluorinated surfactant corresponds to the formula : RF - A - X Wherein : RF stands for a partly or wholly fluorinated hydrocarbon chain comprising at least three fluorine atoms, A stands for a chemical bond or a bivalent hydrocarbon group including a bivalent hydrocarbon group interrupted by one or more hetero atoms or by the group -COO-, -CON(R)- or -SO2N(R)-wherein R is hydrogen or alkyl comprising from one to five C-atoms, X stands for a hydrophilic non-ionic polyoxyalkylene group, a hydrophilic anionic group selected from -SO3M, -OSO3M, -COOM,
Claim 17
Dependent Claim
49 words
A method according to claim 17, wherein the sum of the number of F-atoms in the group RF plus the number of C-atoms in the fluorinated hydrocarbon group of RF and the number of C-atoms in the hydrocarbon group of A (if any) is at least equal to 10.
Claim 18
Dependent Claim
15 words
A method according to claim 13, wherein the fluorinated surfactant comprises a terminal trifluormethyl group.
Claim 19
Dependent Claim
19 words
A method according to claim 13, wherein said fluorinated surfactant is a perfluorocarboxylic acid in acid or salt form.
Claim 20
Dependent Claim
42 words
A method according to claim 13, wherein the fluorinated surfactant is incorporated into the said outer layer or the said underlying hydrophilic colloid layer in an amount comprised between 0.1 and 2 percent by weight relative to the amount of dry colloid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |