US3770528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the surface treatment of polyimide materials
Assignee: CPFilms Inc
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Filing: 1971-09-29
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Granted: 1973-11-06
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Expires: 1991-09-29
Abstract
Abstract Polyimide materials are treated in such fashion as to impart to the treated surface thereof good bondability toward other materials, such as thin films of copper foil, to provide composite laminated articles useful in the industrial arts such as for printed circuitry and the like. The treatment consists essentially in subjecting the surface of the polyimide material to a solution, preferably anhydrous, of an alkali metal hydroxide in a high boiling glycol or glycol ether such as ethylene glycol, propylene glycol, dipropylene glycol, diethylene glycol, tetraethylene glycol, and the mono-ethers and di-ethers of such glycols.
Inventors
- 👤 J Hermes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/00; B32B27/28; B32B27/281; H; H05; H05K; H05K3/00; H05K3/38; H05K3/381; B32B2311/00; B32B2311/12; B32B2379/00; B32B2379/08; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/07; H05K2203/0779; H05K2203/0783; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
A method as defined in claim 1, wherein said alkali metal hydroxide is sodium hydroxide or potassium hydroxide.
Claim 2
Dependent Claim
17 words
A method as defined in claim 1, wherein the glycol or glycol ether solution is substantially anhydrous.
Claim 3
Dependent Claim
38 words
A method as defined in claim 1, wherein the glycol or glycol ether is selected from the class consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, tetraethylene glycol, and mono-lower alkyl and di-lower alkyl ethers thereof.
Claim 4
Dependent Claim
18 words
A method as defined in claim 1, wherein the mono-lower alkyl and di-lower alkyl ethers are methyl ethers.
Claim 5
Dependent Claim
32 words
A method as defined in claim 1, wherein the treatment is carried out at temperatures ranging from about 50* C up to about the glass transition temperature (Tg.) of the polyimide material.
Claim 6
Dependent Claim
26 words
A method as defined in claim 1, wherein the treatment is carried out for a time ranging from about 2 seconds to 60 seconds or more.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |