US3787214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for undercoating a support of photographic material
Assignee: Fujifilm Holdings Corp
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Filing: 1971-09-24
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Granted: 1974-01-22
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Expires: 1991-09-24
Abstract
Abstract A process for undercoating a support of a photographic material is disclosed comprising providing an undercoat layer containing gelatin and a basic substance, such as sodium hydroxide, on an activated surface of a support comprising a polyolefin film or a polyolefin-coated film, said basic substance being included therein so as to maintain the hydrogen ion concentration (pH) of the surface of the undercoat layer at a level of from 6.6 to 9.5. A photographic emulsion adheres firmly to the undercoated surface of the support with a markedly increased bond strength.
Inventors
- 👤 N Minagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The photographic material of claim 1 wherein the polyolefin is polyethylene, polypropylene or a mixture thereof.
Claim 2
Dependent Claim
20 words
The photographic material of claim 2, wherein the basic substance is sodium hydroxide, potassium hydroxide, sodium carbonate or sodium bicarbonate.
Claim 3
Dependent Claim
25 words
The photographic material of claim 2 wherein said undercoat layer further comprises up to about 30 weight percent of a low molecular weight carboxylic acid.
Claim 4
Dependent Claim
20 words
The photographic material of claim 1, wherein the thickness of said undercoat layer is from about 0.01 to 10 microns.
Claim 5
Dependent Claim
21 words
The photographic material of claim 1 wherein the polyolefin portion of said support is from 10 to 100 microns in thickness.
Claim 6
Dependent Claim
76 words
A process for producing a photographic material comprising providing an undercoat layer consisting essentially of gelatin and a hydrophilic basic substance on an activated surface of a support selected from the group consisting of a polyolefin support and a polyolefin-coated support, said hydrophilic basic substance being included to maintain the pH of the surface of the undercoat layer at a level of from 6.6 to 9.5, and coating a photographic light-sensitive emulsion onto said undercoat layer.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |