US3833405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of film base material
Assignee: Ilford Imaging UK Ltd
•
Filing: 1972-08-15
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Granted: 1974-09-03
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Expires: 1992-08-15
Abstract
Abstract Process for the production of film base material wherein one side of a film of synthetic linear polyester is treated with an organic solvent solution of a phenolic adhesion promoting agent, the solvent is removed, the so-treated side is coated with an organic solvent solution of a phenoxy resin which has been partially esterified with an organic polycarboxylic acid and the solvent is removed, the phenoxy resin having the formula WHEREIN EACH OF R1 - R7 is a hydrogen atom or a lower alkyl or cyclohexyl group, R8 is a hydrogen atom or represents the acyl residue of a partial ester of an organic polycarboxylic acid, n is at least 50, and from 10 to 95% of the R8 groups are said acyl residue.
Inventors
- 👤 E Lee
- 👤 K Tatchell
- 👤 K Challis
- 👤 K Cockerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:32
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
A process according to claim 1 wherein n in the formula defined therein is between 95 and 105.
Claim 2
Dependent Claim
22 words
A process according claim 1 wherein the partially esterified phenoxy resin defined in claim 1 is esterified to the extent of 20-65%.
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein the organic polycarboxylic acid used to esterify the phenoxy resin is selected from phthalic acid, trimellitic acid, maleic acid and succinic acid.
Claim 4
Dependent Claim
38 words
A process according to claim 1 wherein the phenolic adhesion promoting agent is selected from m-cresol, o-cresol, resorcinol, orcinol, catechol, pyrogallol, 1-naphthol and such said compounds together with phenol which carry one or more chloro-, fluoro- or nitro-substituents.
Claim 5
Dependent Claim
74 words
A process for the production of film base material which comprises treating one side of a film of synthetic linear polyester of highly hydrophobic character with an organic solvent solution of a phenolic adhesion promoting agent, removing the solvent, coating on to the treated side an organic solvent solution of a phenoxy resin which has been partially esterified with an organic polycarboxylic acid and again removing the solvent, the phenoxy resin having the formula:
Claim 6
Dependent Claim
38 words
A process according to claim 6 wherein the phenolic adhesion promoting agent is selected from m-cresol, o-cresol, resorcinol, orcinol, catechol, pyrogallol, 1-naphthol and such said compounds together with phenol which carry one or more chloro-, fluoro- or nitro-substituents.
References Cited (Backward Citations)
US3177090A
Cited
US3177089A
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US3238087A
Cited
US3539378A
Cited
US3377168A
Cited
US3620812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |