US5151304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure and method for enhancing adhesion to a polyimide surface
Assignee: International Business Machines Corp
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Filing: 1991-01-22
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Granted: 1992-09-29
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Expires: 2011-01-22
Abstract
Abstract The surface of a substrate made of substantially crystalline polyimide is converted to form a layer of substantially amorphous polyimide. The substantially amorphous layer is formed by treating the crystalline polimide surface with a base followed by treatment with an acid to form a polyamic acid layer, which is reimidized to form a substantially amorphous layer by a low temperature heat cycle. Metals or polyimides can be deposited onto this amorphous layer, which is then cured to convert the amorphous layer to substantially crystalline polyimide. This process enhances the adhesion of the metal or polyimide layer without introducing contamination (new foreign materials or new functional groups) from surface treatments of adhesion layers.
Inventors
- 👤 Kang-Wook Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; B; B05; B05D; B05D3/00; B05D3/10; C23; C23C; C23C14/00; C23C14/02; C23C14/06; C23C14/14; C23C14/20; B05D2202/00; B05D2202/10; B05D2505/00; B05D2505/50; B05D3/02; B05D3/0254; 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
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
A process for forming a layer of substantially amorphous polyimide on at least part of the surface of a substantially crystalline polyimide article for subsequent coating of said article followed by recrystallizing said amorphous polyimide comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide.
Claim 2
Dependent Claim
109 words
A process for forming a layer of substantially amorphous polyimide on at least part of the surface of a substantially crystalline polyimide article for subsequent coating of said article followed by recrystallizing said amorphous polyimide comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide.
Claim 3
Dependent Claim
26 words
The process according to claim 1 wherein said base is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, and tetramethyl ammonium hydroxide.
Claim 4
Dependent Claim
21 words
The process according to claim 2 wherein the base is an aqueous solution of from about 0.05M to about 5M base.
Claim 5
Dependent Claim
25 words
The process according to claim 1 wherein said acid is selected from the group consisting of hydrochloric acid, acetic acid, sulfuric acid, and nitric acid.
Claim 6
Dependent Claim
21 words
The process according to claim 4 wherein said acid is an aqueous solution of from about 0.05 to about 2M acid.
Claim 7
Dependent Claim
114 words
A process for improving the adhesion of metals to the surface of a substantially crystalline polyimide article comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide; coating said layer of amorphous polyimide with a metal; and curing said article to convert said substantially amorphous polyimide to substantially crystalline polyimide.
Claim 8
Dependent Claim
114 words
A process for improving the adhesion of metals to the surface of a substantially crystalline polyimide article comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide; coating said layer of amorphous polyimide with a metal; and curing said article to convert said substantially amorphous polyimide to substantially crystalline polyimide.
Claim 9
Dependent Claim
26 words
The process according to claim 6 wherein said base is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, and tetramethyl ammonium hydroxide.
Claim 10
Dependent Claim
25 words
The process according to claim 6 wherein said acid is selected from the group consisting of hydrochloric acid, acetic acid, sulfuric acid, and nitric acid.
Claim 11
Dependent Claim
22 words
The process according to claim 6 wherein said metal is a composite layer of copper, chromium, cobalt, nickel and other transition metals.
Claim 12
Dependent Claim
17 words
The process according to claim 9 wherein said metal is sputter coated onto said amorphous polyimide surface.
Claim 13
Dependent Claim
16 words
The process according to claim 9 wherein said metal is evaporator coated onto said amorphous polyimide.
Claim 14
Dependent Claim
114 words
A process for improving the adhesion of polyimides to the surface of a substantially crystalline polyimide article comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide; coating said layer of amorphous polyimide with a polyimide; and curing said article to convert said substantially amorphous polyimide to substantially crystalline polyimide.
Claim 15
Dependent Claim
114 words
A process for improving the adhesion of polyimides to the surface of a substantially crystalline polyimide article comprising: treating at least a part of the surface of said substantially crystalline polyimide article with a base; washing said base treated surface; treating at least part of the surface of said substantially crystalline polyimide article with an acid to convert said treated substantially crystalline polyimide to polyamic acid; heating said acid treated article to imidize said polyamic acid, thereby forming on said at least part of the surface a layer of amorphous polyimide; coating said layer of amorphous polyimide with a polyimide; and curing said article to convert said substantially amorphous polyimide to substantially crystalline polyimide.
Claim 16
Dependent Claim
26 words
The process according to claim 12 wherein said base is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide and tetramethyl ammonium hydroxide.
Claim 17
Dependent Claim
25 words
The process according to claim 12 wherein said acid is selected from the group consisting of hydrochloric acid, acetic acid, sulfuric acid, and nitric acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |