US3751280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a photographic film base having a subbing layer
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-02-01
•
Granted: 1973-08-07
•
Expires: 1991-02-01
Abstract
Abstract Coating of biaxially oriented polyester films with a subbing composition including a polymeric and a water-permeable component such as gelatin before the film is fully oriented.
Inventors
- 👤 M Nerurkar
- 👤 P Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:13
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93; G03C1/795; G03C1/7954
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
A method according to claim 1, in which the polymeric film is a polyethylene terephthalate film.
Claim 2
Dependent Claim
49 words
A method according to claim 2, in which the cast film is biaxially oriented by stretching in its longitudinal and transverse directions in sequence, or vice versa, and the subbing composition is applied to the film after stretching in the first direction and before stretching in the second direction.
Claim 3
Dependent Claim
24 words
A method according to claim 1, in which the subbing composition is applied as a solution and is dried before the subsequent stretching operation.
Claim 4
Dependent Claim
23 words
A method according to claim 1, in which the subbing composition comprises 0.4 to 2 percent by weight of the water permeable component.
Claim 5
Dependent Claim
22 words
A method according to claim 1, in which the subbing composition comprises 5.0 to 12.0 percent by weight of the polymeric component.
Claim 6
Dependent Claim
32 words
A method according to claim 1, in which the polymeric component comprises a copolymer of butadiene with one or more comonomers chosen from acrylonitrile, styrene, methyl methacrylate methacrylic acid and itaconic acid.
Claim 7
Dependent Claim
32 words
A method according to claim 7 in which the polymeric component is a butadiene terpolymer comprising, by weight 23 parts of butadiene, 73 parts of styrene and 4 parts of itaconic acid.
Claim 8
Dependent Claim
46 words
A method according to claim 1, in which, a gelatin subbing layer is applied over the layer comprising the polymeric component and the water permeable component and the film base is heated at a temperature from 80* to 110*C to effect bonding between the two layers.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |