US4442283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide adhesive from lactam, aromatic dianhydride, aliphatic dianhydride and diamine
Assignee: IMI-TECH Corp ELK GROVE ILL A CORP OF
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Filing: 1982-09-27
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Granted: 1984-04-10
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Expires: 2002-09-27
Abstract
Abstract Modified polyimide adhesives useful for high efficiency bonding at moderate temperatures. Basically, the adhesives are prepared by reacting suitable quantities of an oxime, an aromatic tetracarboxylic acid dianhydride and an aliphatic tetracarboxylic acid dianhydride, esterifying the resulting bisimide with a reactive solvent esterifying agent and mixing therewith a suitable diamine. This copolyimide adhesive may be dried to a selected viscosity before or after coating onto one or both surfaces to be bonded together. When the surfaces are pressed together under moderate pressure and heated for a suitable period at a temperature in the range of about 230° to 320° C. an excellent, flexible bond is obtained, having high peel strength and excellent resistance to high temperatures.
Inventors
- 👤 John Gagliani
- 👤 John V. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1032; C09; C09J; C09J179/00; C09J179/04; C09J179/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31721
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
In the method for preparing a polyimide adhesive which comprises the steps of: preparing a mixture of an aromatic tetracarboxylic acid dianhydride with an oxime in a mole ratio of oxime to tetracarboxylic acid dianhydride between about 0.01:1 and 1:1 to produce an N-substituted aliphatic imide; dissolving said imide in a solvent; and adding thereto a diamine; the improvement comprising: adding to the mixture an aliphatic tetracarboxylic acid dianhydride either before or after the mixture is dissolved in said solvent; and wherein said solvent is a reactive solvent esterifying agent.
Claim 2
Dependent Claim
90 words
In the method for preparing a polyimide adhesive which comprises the steps of: preparing a mixture of an aromatic tetracarboxylic acid dianhydride with an oxime in a mole ratio of oxime to tetracarboxylic acid dianhydride between about 0.01:1 and 1:1 to produce an N-substituted aliphatic imide; dissolving said imide in a solvent; and adding thereto a diamine; the improvement comprising: adding to the mixture an aliphatic tetracarboxylic acid dianhydride either before or after the mixture is dissolved in said solvent; and wherein said solvent is a reactive solvent esterifying agent.
Claim 3
Dependent Claim
19 words
The improvement according to claim 1 wherein said solvent is an alcohol having from one to six carbon atoms.
Claim 4
Dependent Claim
12 words
The improvement according to claim 2 wherein said solvent is methyl alcohol.
Claim 5
Dependent Claim
28 words
The improvement according to claim 1 wherein said aromatic tetracarboxylic acid dianhydride is selected from the group consisting of tetracarboxylic acid dianhydride, pyromellitic dianhydride and a mixture thereof.
Claim 6
Dependent Claim
16 words
The improvement according to claim 1 wherein said aliphatic tetracarboxylic acid dianhydride is 1,2,3,4-butanetetracarboxylic acid dianhydride.
Claim 7
Dependent Claim
23 words
The improvement according to claim 1 wherein said oxime has the general formula: ##STR3## where x is an integer from 2 to 4.
Claim 8
Dependent Claim
11 words
The improvement according to claim 6 wherein said oxime is caprolactam.
Claim 9
Dependent Claim
31 words
The improvement according to claim 1 wherein the number of moles of diamine is equal to the sum of the moles of aromatic tetracarboxylic acid dianhydride and aliphatic tetracarboxylic acid dianhydride.
Claim 10
Dependent Claim
23 words
The improvement according to claim 1 wherein said diamine is selected from the group consisting of methylene dianiline, 4,4'-diaminophenyl oxide and mixtures thereof.
Claim 11
Dependent Claim
32 words
The improvement according to claim 1 further including the step of adding to the mixture from about 0.01 to 2 weight percent of a surfactant based on the weight of the mixture.
Claim 12
Dependent Claim
85 words
A modified adhesive comprising a mixture of: an oxime; from about 0.1 to 1.0 moles of an aromatic tetracarboxylic acid dianhydride per mole of oxime; from about 10 to 20 moles of a reactive solvent esterifying agent per mole of oxime; and from about 10 to 20 moles of a reactive solvent esterifying agent per mole of oxime; and a diamine present in a molar quantity substantially equal to the sum of the moles of said aromatic tetracarboxylic acid dianhydride and aliphatic tetracarboxylic acid dianhydride.
Claim 13
Dependent Claim
85 words
A modified adhesive comprising a mixture of: an oxime; from about 0.1 to 1.0 moles of an aromatic tetracarboxylic acid dianhydride per mole of oxime; from about 10 to 20 moles of a reactive solvent esterifying agent per mole of oxime; and from about 10 to 20 moles of a reactive solvent esterifying agent per mole of oxime; and a diamine present in a molar quantity substantially equal to the sum of the moles of said aromatic tetracarboxylic acid dianhydride and aliphatic tetracarboxylic acid dianhydride.
Claim 14
Dependent Claim
25 words
The adhesive according to claim 11 further including from about 0.01 to 2 weight percent of a surfactant based on the weight of the mixture.
Claim 15
Dependent Claim
32 words
The adhesive according to claim 11 wherein said aromatic tetracarboxylic acid dianhydride is 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride, pyromellitic dianhydride or mixtures thereof and said aliphatic tetracarboxylic acid dianhydride is 1,2,3,4-butanetetracarboxylic acid dianhydride.
Claim 16
Dependent Claim
30 words
The adhesive according to claim 12 wherein said oxime is caprolactam and the molar ratio of oxime to aromatic tetracarboxylic acid dianhydride to aliphatic tetracarboxylic acid dianhydride is about 1:1:1.
Claim 17
Dependent Claim
23 words
The adhesive according to claim 11 wherein said diamine is selected from the group consisting of methylene dianiline, 4,4'-diaminophenyl oxide and mixtures thereof.
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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |