Patent US4842949A successfully refreshed from Google Patents.
US4842949A
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Methods and compositions for producing polyimide adhesive bonds
Assignee: Individual
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Filing: 1985-06-20
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Granted: 1989-06-27
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Expires: 2005-06-20
Abstract
Abstract Methods and compositions for producing imide precursors and polyimide coating and adhesives. Basically a mixture of an oxoimine such as caprolactam, a dianhydride such as 3,3', 4,4'-benzophenone tetracarboxylic acid dianhydride and a solvent such as dimethyl formamide is heated to a temperature of about 60° to 120° C. for a suitable period, then the mixture is cooled and a suitable diamine is added to produce the imide precursor. This mixture may be dried to a powder form or may be used directly as a coating or adhesive. The final polyimide is produced by heating the precursor to a suitable temperature over an appropriate period.
Inventors
- 👤 John Gagliani
- 👤 John V. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A method of bonding two smooth surfaces together which comprises the steps of: providing a quantity of a solvent; adding thereto in either order, an aromatic tetracarboxylic acid dianhydride and from just above 0 to 10 moles of an oxoimine per mole of said dianhydride, said oxoimine having the general structure. ##STR4## where x is 4 to 7; maintaining the resulting mixture at a temperature of from about 30° to 120° C.; stirring said mixture until solution is complete; cooling the resulting solution to a temperature of from about 20° to 60° C.; adding thereto about 1.0 moles of a diamine per mole of dianhydride; and stirring until solution is complete producing an imide precurser solution; forming a coating of said imide precurser solution on at least one of two smooth surfaces to be bonded together; drying said coating; pressing said surfaces together with said coating therebetween; and heating the resulting assembly at a temperature of about 200° to 300° C. for from about 30 minutes to 5 hours.
Claim 2
Independent Claim
169 words
A method of bonding two smooth surfaces together which comprises the steps of: providing a quantity of a solvent; adding thereto in either order, an aromatic tetracarboxylic acid dianhydride and from just above 0 to 10 moles of an oxoimine per mole of said dianhydride, said oxoimine having the general structure. ##STR4## where x is 4 to 7; maintaining the resulting mixture at a temperature of from about 30° to 120° C.; stirring said mixture until solution is complete; cooling the resulting solution to a temperature of from about 20° to 60° C.; adding thereto about 1.0 moles of a diamine per mole of dianhydride; and stirring until solution is complete producing an imide precurser solution; forming a coating of said imide precurser solution on at least one of two smooth surfaces to be bonded together; drying said coating; pressing said surfaces together with said coating therebetween; and heating the resulting assembly at a temperature of about 200° to 300° C. for from about 30 minutes to 5 hours.
Claim 3
Dependent Claim
10 words
The product produced according to the method of claim 1.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein said imide precurser is coated and dried onto both surfaces to be bonded together.
Claim 5
Dependent Claim
54 words
The method according to claim 1 further including the steps, before coating said at least one surface of; drying said imide precurser solution to a powder; storing said powder for a selected period; and spreading a substantially uniform layer of said powder on said at least one surface prior to pressing said surfaces together.
Claim 6
Dependent Claim
59 words
The method according to claim 1 further including the steps, before coating said at least one surface, of; drying said imide precurser solution to a powder; storing said powder for a selected period; dissolving said powder in a solvent after said storage; and spreading the resulting solution on said at least on surface prior to pressing said surfaces together.
Claim 7
Dependent Claim
31 words
The method according to claim 1 further including the step of adding to said imide precurser solution up to about 0.1 molecular parts of an adhesion promoter per molecular part diamine.
Claim 8
Dependent Claim
28 words
The method according to claim 1 wherein said aromatic tetracarboxylic acid dianhydride is selected from the group consisting of 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride, pyromellitic dianhydride, and mixtures thereof.
Claim 9
Dependent Claim
37 words
The method according to claim 1 wherein the ratio of oxomine to dianhydride is from just above 0 to 1 and said oxoimine is selected from the group consisting of caprolactam, 2-pyrrolidone or 2-piperidone and mixtures thereof.
Claim 10
Dependent Claim
19 words
The method according to claim 1 wherein said oxomine is caprolactam and said dianhydride is 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride.
Claim 11
Dependent Claim
18 words
The method according to claim 1 wherein said solvent is dimethyl formamide, and said diamine is 4,4'-diaaminodiphenyl methone.
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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |