US4431727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective overcoats for photographic elements
Assignee: Eastman Kodak Co
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Filing: 1982-06-14
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Granted: 1984-02-14
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Expires: 2002-06-14
Abstract
Abstract Protective layers for photographic elements comprise a compatible blend of: (a) cellulose nitrate and (b) a hydrophobic polymer wherein the blend has a sufficient amount of the hydrophobic polymer so as to have a glass transition temperature of at least about 50° C. and a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents and photographic processing compositions. The overcoat is particularly useful with motion-picture elements containing silver halide which are subjected to chlorinated hydrocarbon solvents during a cleaning process or during wet gate printing.
Inventors
- 👤 David J. Steklenski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A radiation-sensitive photographic element comprising a support having on one side thereof a hydrophilic, radiation-sensitive layer and on the other side thereof, as the outermost layer, a layer comprising a compatible blend of: (a) cellulose nitrate and (b) a hydrophobic polymer wherein said blend has a glass transition temperature of at least about 50° C. and contains a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents.
Claim 2
Dependent Claim
72 words
A radiation-sensitive photographic element comprising a support having on one side thereof a hydrophilic, radiation-sensitive layer and on the other side thereof, as the outermost layer, a layer comprising a compatible blend of: (a) cellulose nitrate and (b) a hydrophobic polymer wherein said blend has a glass transition temperature of at least about 50° C. and contains a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents.
Claim 3
Dependent Claim
85 words
A photographic element comprising a support having on one side thereof a hydrophilic, radiation-sensitive silver halide layer and on the other side thereof, an antistatic layer comprising a binder having therein a conductive compound and, as the outermost layer, a layer comprising a compatible blend of: (a) cellulose nitrate and (b) a hydrophobic polymer wherein said blend has a glass transition temperature of at least about 50° C. and contains a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents.
Claim 4
Dependent Claim
85 words
A photographic element comprising a support having on one side thereof a hydrophilic, radiation-sensitive silver halide layer and on the other side thereof, an antistatic layer comprising a binder having therein a conductive compound and, as the outermost layer, a layer comprising a compatible blend of: (a) cellulose nitrate and (b) a hydrophobic polymer wherein said blend has a glass transition temperature of at least about 50° C. and contains a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents.
Claim 5
Dependent Claim
42 words
A silver halide photographic element as in claim 2 wherein said antistatic layer comprises an antistatic, crosslinked vinylbenzyl quaternary ammonium polymer in combination with a hydrophobic binder, wherein the weight ratio of binder to antistatic crosslinked polymer is about 10:1 to 1:1.
Claim 6
Dependent Claim
34 words
A photographic element as in claim 2 wherein said antistatic layer comprises a coalesced, cationically stabilized latex and a polyaniline acid addition salt semiconductor, wherein the semiconductor is associated with the latex before coalescing.
Claim 7
Dependent Claim
22 words
A photographic element as in claims 1 or 2 wherein said blend contains between 5 and 70 percent by weight cellulose nitrate.
Claim 8
Dependent Claim
26 words
A element as in claims 1 or 2 wherein said hydrophobic polymer is a polymer which comprises at least about 10 weight percent of an acrylate.
Claim 9
Dependent Claim
33 words
A photographic element as in claims 1 or 2 wherein said hydrophobic polymer is selected from the group consisting of poly(methyl methacrylate), poly(butyl acrylate-co-methyl methacrylate), poly(vinyl acetate-co-methyl methacrylate), poly(ethyl methacrylate) and poly(styrene-co-methyl methacrylate).
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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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |