US4755424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide film having improved adhesive properties
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1987-01-20
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Granted: 1988-07-05
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Expires: 2007-01-20
Abstract
Abstract A polyimide film produced by forming a film from a raw material incorporated with a finely divided inorganic powder that forms minute projections on the film surface and subsequently subjecting the film to corona discharge treatment. According to this invention, it is possible to obtain a heat-resistant polyimide film having improved adhesive properties and uniform bond strength. The film does not cause blocking when wound into a roll.
Inventors
- 👤 Yoshiki Takeoka
- 👤 Hideki Kawai
- 👤 Tsuneo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:58
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; B; B29; B29C; B29C59/00; B29C59/10; B29C70/00; B29C70/58; B29C70/64; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/32; C08K3/34; C08K3/36; B29K; B29K2079/00; H05K1/032; H05K1/0346; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2203/00; H05K2203/09; H05K2203/095; H05K2203/097; H05K3/00; H05K3/38; H05K3/381; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A polyimide film produced by forming a polyimide film having a thickness of 7.5 to 125 μm from a raw material incorporated with a finely divided inorganic powder having a particle size of 1 to 5 μm that forms minute projections on the surface of the formed film, and subsequently subjecting the formed film to a corona discharge treatment.
Claim 2
Dependent Claim
59 words
A polyimide film produced by forming a polyimide film having a thickness of 7.5 to 125 μm from a raw material incorporated with a finely divided inorganic powder having a particle size of 1 to 5 μm that forms minute projections on the surface of the formed film, and subsequently subjecting the formed film to a corona discharge treatment.
Claim 3
Dependent Claim
41 words
A polyimide film as claimed in claim 1, wherein the finely divided inorganic powder is at least one selected from the group consisting of SiO 2 , TiO 2 , CaHPO 4 , and Ca 2 P 2 O 7 .
Claim 4
Dependent Claim
22 words
A polyimide film as claimed in claim 1, wherein the corona discharge treatment is performed at 20 to 500 W·min/m 2 .
References Cited (Backward Citations)
US4612235A
Cited
US4601916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |