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US4808468A
Expired / Lapsed
US
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Polyimide film and its manufacturing method
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1987-08-21
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Granted: 1989-02-28
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Expires: 2007-08-21
Abstract
Abstract The present invention provides a polyimide film whose residual content of volatiles is reduced to not more than 0.45 weight % on the basis of the film, and further a polyimide film whose residual content of volatiles is reduced to not more than 0.45 weight % on the basis of the film and whose oxygen/carbon ratio in the surface layer is increased by 0.01-0.1, and manufacturing methods therefor. According to the present invention, it is possible to provide a polyimide film improved in adhesion performance in a stable and homogeneous manner, and this improvement of adhesion performance is attainable in the film-forming process, not in a separate process of after-treatment.
Inventors
- 👤 Hitoshi Nojiri
- 👤 Katuhiro Kitai
- 👤 Yoshihide Ohnari
- 👤 Masaro Kidoh
- 👤 Tsuneo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:21
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B29; B29D; B29D7/00; B29D7/01; C08J5/00; C08J5/18; B29C; B29C59/00; B29C59/10; B29C59/14; B29C71/00; B29C71/02; B29K; B29K2079/00; C08J2379/00; C08J2379/04; C08J2379/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K3/00; H05K3/38; H05K3/381; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
24 words
A polyimide film characterized in that its residual content of volatiles is reduced to not more than 0.45 weight % based on the film.
Claim 2
Dependent Claim
24 words
A polyimide film characterized in that its residual content of volatiles is reduced to not more than 0.45 weight % based on the film.
Claim 3
Dependent Claim
13 words
A polyimide film in accordance with claim 1, wherein it consists of poly-[N,N'-P,P'-oxydiphenylene-pyromellit]-imide.
Claim 4
Dependent Claim
20 words
A polyimide film in accordance with claim 1 or 2, wherein its thickness is in a range of 10-125 μm.
Claim 5
Dependent Claim
18 words
A polyimide film in accordance with claim 3, wherein its thickness is in a range of 50-125 μm.
Claim 6
Dependent Claim
30 words
A polyimide film manufacturing method characterized in that said film is heat-treated to reduce its residual content of volatiles to not more than 0.45 weight % based on the film.
Claim 7
Dependent Claim
30 words
A polyimide film manufacturing method characterized in that said film is heat-treated to reduce its residual content of volatiles to not more than 0.45 weight % based on the film.
Claim 8
Dependent Claim
16 words
A polyimide film manufacturing method in accordance with claim 5, wherein the film consists of [N,N'-P,P'-oxydiphenylene-pyromellit]-imide.
Claim 9
Dependent Claim
19 words
A polyimide film manufacturing method in accordance with claim 5 or 6, wherein the film is 10-125 μm thick.
Claim 10
Dependent Claim
17 words
A polyimide film manufacturing method in accordance with claim 7, wherein the film is 50-125 μm thick.
Claim 11
Dependent Claim
23 words
A polyimide film manufacturing method in accordance with claim 5, wherein it is produced by the chemical cure method using an imidizing agent.
Claim 12
Dependent Claim
36 words
A polyimide film characterized in that its residual content of volatiles is reduced to not more than 0.45 weight % based on the film and the oxygen/carbon ratio of the surface layer is increased by 0.01-0.1.
Claim 13
Dependent Claim
36 words
A polyimide film characterized in that its residual content of volatiles is reduced to not more than 0.45 weight % based on the film and the oxygen/carbon ratio of the surface layer is increased by 0.01-0.1.
Claim 14
Dependent Claim
13 words
A polyimide film in accordance with claim 10, wherein it consists of poly-[N,N'-P,P'-oxydiphenylene-pyromellit]-imide.
Claim 15
Dependent Claim
20 words
A polyimide film in accordance with claim 10 or 11, wherein its thickness is in a range of 10-125 μm.
Claim 16
Dependent Claim
18 words
A polyimide film in accordance with claim 12, wherein its thickness is in a range of 50-125 μm.
Claim 17
Dependent Claim
38 words
A polyimide film manufacturing method characterized in that a polyimide film with its residual content of volatiles of not more than 0.45 weight % based on the film is treated by the corona discharge or plasma treating process.
Claim 18
Dependent Claim
38 words
A polyimide film manufacturing method characterized in that a polyimide film with its residual content of volatiles of not more than 0.45 weight % based on the film is treated by the corona discharge or plasma treating process.
Claim 19
Dependent Claim
25 words
A polyimide film manufacturing method in accordance with claim 14, wherein the corona discharge treatment is carried out under conditions of 10-1,000 W/m 2 /minute.
Claim 20
Dependent Claim
25 words
A polyimide film manufacturing method in accordance with claim 15, wherein the corona discharge treatment is carried out under conditions of 30-600 W/m 2 /minute.
Claim 21
Dependent Claim
16 words
A polyimide film manufacturing method in accordance with claim 14, wherein the film consists of poly-[N,N'-P,P'-oxydiphenylene-pyromellit]-imide.
Claim 22
Dependent Claim
21 words
A polyimide film manufacturing method in accordance with claim 14, wherein the film thickness is in a range of 10-125 μm.
Claim 23
Dependent Claim
21 words
A polyimide film manufacturing method in accordance with claim 18, wherein the film thickness is in a range of 50-125 μm.
Claim 24
Dependent Claim
23 words
A polyimide film manufacturing method in accordance with claim 14, wherein the file is produced by chemical cure method using an imidizing agent.
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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |