US4467000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating a substrate with polyimide
Assignee: International Business Machines Corp
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Filing: 1983-03-29
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Granted: 1984-08-21
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Expires: 2003-03-29
Abstract
Abstract A process for coating a substrate to provide good planarization and good mechanical and thermal stability, the process comprising applying to the substrate an amino-terminated oligomer and an ester, with the oligomer being formed from an aromatic diamine and from an aromatic dianhydride, and the ester being formed from an aromatic tetracarboxylic acid and an alcohol, and by reacting said oligomer and said ester in situ, with the process being characterized in that the ester reacts with an amine group of the oligomer to form a high molecular weight polyamide at a temperature between 40° C. and 140° C., and continues to react to form a cyclic imide.
Inventors
- 👤 James Economy
- 👤 Willi Volksen
- 👤 Do Y. Yoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:50
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/02; B05D3/0209; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A process for coating a substrate, said process comprising the steps of: (1) applying to said substrate a solution of an amino-terminated oligomer and an ester, the oligomer being formed from an aromatic diamine and from an aromatic dianhydride and the ester being formed from an aromatic tetracarboxylic acid and an alcohol, (2) reacting said oligomer and said ester in situ at a temperature between 40° C. and 140° C. so that the ester reacts with an amine group of the oligomer to form a high molecular weight polyamide, (3) continuing the reaction until a cyclic imide is formed, and (4) curing the coating by the application of heat.
Claim 2
Dependent Claim
109 words
A process for coating a substrate, said process comprising the steps of: (1) applying to said substrate a solution of an amino-terminated oligomer and an ester, the oligomer being formed from an aromatic diamine and from an aromatic dianhydride and the ester being formed from an aromatic tetracarboxylic acid and an alcohol, (2) reacting said oligomer and said ester in situ at a temperature between 40° C. and 140° C. so that the ester reacts with an amine group of the oligomer to form a high molecular weight polyamide, (3) continuing the reaction until a cyclic imide is formed, and (4) curing the coating by the application of heat.
Claim 3
Dependent Claim
20 words
It is respectfully requested that the above-identified application be reexamined in view of the foregoing amendment and the following remarks.
Claim 4
Dependent Claim
20 words
It is respectfully requested that the above-identified application be reexamined in view of the foregoing amendment and the following remarks.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1 wherein the ester is one formed from the alcohol CF 3 --CH 2 --OH.
Claim 6
Dependent Claim
17 words
A process as claimed in claim 1 wherein the ester is one formed from the alcohol ##STR2##
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 wherein the aromatic tetracarboxylic acid is pyromellitic acid.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 1 wherein the aromatic tetracarboxylic acid is benzophenone tetracarboxylic acid.
Claim 9
Dependent Claim
12 words
A process as claimed in claim 1 wherein the diamine is oxydianiline.
Claim 10
Dependent Claim
20 words
A process as claimed in claim 1 wherein the oligomer has an initial molecular weight of from 500 to 10,000.
Claim 11
Dependent Claim
20 words
A process as claimed in claim 1 wherein the oligomer has an initial molecular weight of from 1,000 to 5,000.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |