US4931310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating the surface of polyimides to improve properties to receive metal layer
Assignee: International Business Machines Corp
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Filing: 1988-11-25
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Granted: 1990-06-05
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Expires: 2008-11-25
Abstract
Abstract A process is provided for improving the surface properties of polyimide articles which contain significant amounts of transimide. The surface of the polyimide containing the transimide is first treated with a base to convert the surface layer of both the polyimides and the transimides to polyamic salt. Thereafter the surface layer of the converted polyamic salt is treated with an acid to convert the layer to a polyamic acid. This is followed by a cure preferably in infrared radiation at a sufficiently rapid rate to prevent the formation of any significant amounts of transimide and provide only polyimide. Following this treatment metallization is applied to the improved surface layer.
Inventors
- 👤 Morris Anschel
- 👤 Walter P. Pawlowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:54
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/20; H; H05; H05K; H05K3/00; H05K3/38; H05K3/381; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
114 words
A process for improving the surface properties of a polyimide article for the reception of a metal film and wherein said polyimide article has substantial amounts of transimide present, said process comprising, in the order listed, the steps of: treating the surface of the article with a base to convert the surface layer of the polyimide and transimide to polyamic acid salts, thereafter treating the surface with an acid to convert the polyamic acid salts to polyamic acid, and thereafter curing the surface layer of polyamic acid sufficiently rapidly to form a polyimide surface substantially free to transimide, whereby the surface properties of the article for the reception of a metal layer are improved.
Claim 2
Dependent Claim
114 words
A process for improving the surface properties of a polyimide article for the reception of a metal film and wherein said polyimide article has substantial amounts of transimide present, said process comprising, in the order listed, the steps of: treating the surface of the article with a base to convert the surface layer of the polyimide and transimide to polyamic acid salts, thereafter treating the surface with an acid to convert the polyamic acid salts to polyamic acid, and thereafter curing the surface layer of polyamic acid sufficiently rapidly to form a polyimide surface substantially free to transimide, whereby the surface properties of the article for the reception of a metal layer are improved.
Claim 3
Dependent Claim
20 words
The invention as defined in claim 1 wherein the base is selected from alkali metal hydroxides and alkaline metal hydroxides.
Claim 4
Dependent Claim
15 words
The invention as defined in claim 1 wherein the base is an alkali metal hydroxide.
Claim 5
Dependent Claim
13 words
The invention as defined in claim 3 wherein the base is sodium hydroxide.
Claim 6
Dependent Claim
14 words
The invention as defined in claim 1 wherein the acid is an organic acid.
Claim 7
Dependent Claim
13 words
The invention as defined in claim 5 wherein the acid is acetic acid.
Claim 8
Dependent Claim
20 words
The invention as defined in claim 1 wherein the curing step is performed by infrared radiation treatment of the surface.
Claim 9
Dependent Claim
21 words
The invention as defined in claim 7 wherein the infrared radiation is in the wave length of one to three microns.
Claim 10
Dependent Claim
106 words
A process for improving the adhesion of metals to the surface of a polyimide article wherein said polyimide article has substantial amounts of transimide present, said process comprising in the order listed the steps of: treating the surface of the article with a base to convert the surface layer of the polyimide and transimide to polyamic acid salts to polyamic acid, thereafter curing the surface layer with polyamic acid sufficiently rapidly to form a polyimide surface substantially free of transimide, and thereafter applying a metallization layer to the surface of the article, whereby the adhesion of the metal to the surface of the article is improved.
Claim 11
Dependent Claim
106 words
A process for improving the adhesion of metals to the surface of a polyimide article wherein said polyimide article has substantial amounts of transimide present, said process comprising in the order listed the steps of: treating the surface of the article with a base to convert the surface layer of the polyimide and transimide to polyamic acid salts to polyamic acid, thereafter curing the surface layer with polyamic acid sufficiently rapidly to form a polyimide surface substantially free of transimide, and thereafter applying a metallization layer to the surface of the article, whereby the adhesion of the metal to the surface of the article is improved.
Claim 12
Dependent Claim
20 words
The invention as defined in claim 9 wherein the base is selected from alkali metal hydroxides and alkaline metal hydroxides.
Claim 13
Dependent Claim
15 words
The invention as defined in claim 9 wherein the base is an alkali metal hydroxide.
Claim 14
Dependent Claim
13 words
The invention as defined in claim 11 wherein the base is sodium hydroxide.
Claim 15
Dependent Claim
14 words
The invention as defined in claim 9 wherein the acid is an organic acid.
Claim 16
Dependent Claim
13 words
The invention as defined in claim 13 wherein the acid is acetic acid.
Claim 17
Dependent Claim
20 words
The invention as defined in claim 9 wherein the curing step is performed by infrared radiation treatment of the surface.
Claim 18
Dependent Claim
21 words
The invention as defined in claim 15 wherein the infrared radiation is in the wave length of one to three microns.
Claim 19
Dependent Claim
26 words
The invention as defined in claims 9, 10, 11, 12, 13, 14, 15 or 16 wherein the metal is a composite layer of Cr and Cu.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |