US3779771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic elements containing removable antihilation layer
Assignee: 3M Co
•
Filing: 1972-01-14
•
Granted: 1973-12-18
•
Expires: 1992-01-14
Abstract
Abstract A silver halide photographic element which comprises a polyester support bearing on one surface thereof an antihalation layer which includes a continuous, compatible, solid mixture of anionic polymers including one polymer having a melting point below about 30* C, finely divided conductive carbon, and a particulate phase of a hard, water-insoluble wax.
Inventors
- 👤 K Gatzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:10
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/835; G03C1/85; G03C1/89
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
The photographic element of claim 1 wherein said at least one species is the copolymer of ethyl acrylate and acrylic acid.
Claim 2
Dependent Claim
34 words
The photographic element of claim 1 wherein said mixture of anionic polymers comprises a compatible, solid mixture of two or more of said anionic polymers, each derived from an acrylate monomer of the formula
Claim 3
Dependent Claim
32 words
The photographic element of claim 1 wherein said antihalation layer includes at least one anionic, non-ionic or amphoteric emulsifier having a hydrocarbyl group of from about 10 to about 18 carbon atoms.
Claim 4
Dependent Claim
30 words
The photographic element of claim 4 wherein said emulsifier is employed in said antihalation layer in an amount of from 1.0 to about 10 percent by weight of solids thereof.
Claim 5
Dependent Claim
32 words
The photographic element of claim 1 wherein sufficient of said conductive carbon is employed in said antihalation layer to impart to said layer a surface resistivity of not greater than 1.0 megohm/square.
Claim 6
Dependent Claim
12 words
The photographic element of claim 1 wherein said wax is carnauba wax.
Claim 7
Dependent Claim
13 words
The photographic element of claim 1 wherein said emulsifier is sodium lauryl sulfate.
Claim 8
Dependent Claim
87 words
A silver halide photographic film element which includes a bare polyester support bearing on one surface thereof, as an outer layer, an antihalation layer having a resistivity of less than 50 megohms/square, said layer comprising a. a continuous phase of a compatible, solid mixture of normally water insoluble anionic polymers, at least one species thereof being a copolymer of ethyl acrylate and acrylic acid having a melting point below about 30* C; b. finely divided conductive carbon; and c. a particulate phase of a hard, water-insoluble wax.
Claim 9
Dependent Claim
32 words
The photographic element of claim 9 wherein said antihalation layer includes at least one anionic, non-ionic or amphoteric emulsifier having a hydrocarbyl group of from about 10 to about 18 carbon atoms.
References Cited (Backward Citations)
US2221873A
Cited
US2856283A
Cited
US3488708A
Cited
US3545972A
Cited
US3617286A
Cited
US3660153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |