US4859530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature adhesive for polymide films
Assignee: Ethyl Corp
•
Filing: 1987-07-09
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Granted: 1989-08-22
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Expires: 2007-07-09
Abstract
Abstract Thermoplastic polyimides of benzophenone tetracarboxylic acid or an ester or anhydride thereof and a 2,2-bis[4-(amino-phenoxy)phenyl]hexafluoropropane are excellent adhesives for bonding polyimide films to various substrates including polyimide film, metals, etc. The film and substrate need not be abraded before application of the polyamic acid resin or polyimide precursor from which the polyimide is formed on curing. The bond is tenacious. Even after heating to 800° F. the bond was stronger than two different polyimide films. Interposing between the polyimide film and the substrate a strip or patch of a prepreg made from polyimide precursor solutions composed of monomers, solvent and polyamide acid, and applying heat to cure the resin in situ while keeping the components in intimate contact by application of slight pressure is a preferred way of applying and utilizing the adhesives. Such prepregs are also useful for bonding metal to metal or to various other substrates.
Inventors
- 👤 David N. Roark
- 👤 Jules A. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:30
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B27/00; B32B27/04; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/06; B32B27/08; B32B27/28; B32B27/281; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/24; C08J5/241; C08J5/243; C08J5/249; B32B2311/00; B32B2311/12; B32B2379/00; B32B2379/08; C08J2379/00; C08J2379/04; C08J2379/08; H; H05; H05K; H05K3/00; H05K3/38; H05K3/386; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/249951; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/133; Y10T442/138
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
108 words
A method of bonding a metal to a substrate which comprises placing therebetween a prepreg composed of a fibrous substrate coated and impregnated with a tacky polyimide precursor of (a) a substantially equimolar mixture of (i) 2,2-bis[4-(4-(4aminophenoxy)phenyl]hexafluoropropane or 2,2-bis[4-(3-aminophenoxy)phenyl]hexafluoropropane, or both, and (ii) lower alkyl diester of benzophenone tetracarboxylic acid; (b) about 2 to 50 weight percent of polyamic acid polyamide producible from components (i) and (ii); and (c) about 10 to 50 weight percent of solvent; applying heat to cause the formation of the polyimide in situ while maintaining the metal and first-named substrate in intimate contact with the curing prepreg; and then cooling the resultant article.
Claim 2
Independent Claim
108 words
A method of bonding a metal to a substrate which comprises placing therebetween a prepreg composed of a fibrous substrate coated and impregnated with a tacky polyimide precursor of (a) a substantially equimolar mixture of (i) 2,2-bis[4-(4-(4aminophenoxy)phenyl]hexafluoropropane or 2,2-bis[4-(3-aminophenoxy)phenyl]hexafluoropropane, or both, and (ii) lower alkyl diester of benzophenone tetracarboxylic acid; (b) about 2 to 50 weight percent of polyamic acid polyamide producible from components (i) and (ii); and (c) about 10 to 50 weight percent of solvent; applying heat to cause the formation of the polyimide in situ while maintaining the metal and first-named substrate in intimate contact with the curing prepreg; and then cooling the resultant article.
Claim 3
Dependent Claim
14 words
The method of claim 1 in which the 2,2-bis[4[-(aminophenoxy)phenyl]hexafluoropropane of the precursor is 2,2-bis[4-(4-aminophenoxy)]hexafluoropropane.
Claim 4
Dependent Claim
13 words
The method claim 1 in which the first-named substrate is a polyimide film.
Claim 5
Dependent Claim
13 words
The method of claim 1 in which the first-named substrate is a metal.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the fibrous substrate of the prepreg is composed of unidirectionally aligned fibers.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the fibrous substrate of the prepreg is a strip or tape.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the surfaces of the metal and the substrate between which the prepreg is placed are not pre-abraded.
Claim 9
Dependent Claim
20 words
An article produced according to claim 1 wherein the fibrous substrate of the prepreg is composed of unidirectionally aligned fibers.
Claim 10
Dependent Claim
19 words
An article produced according to claim 1 wherein the fibrous substrate of the prepreg is a strip or tape.
Claim 11
Dependent Claim
7 words
An article produced according to claim 1.
Claim 12
Dependent Claim
16 words
An article produced according to claim 1 in which the 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane of the precursor is 2,2-bis[4-(4-(aminophenoxy)phenyl)]hexafluoropropane.
Claim 13
Dependent Claim
16 words
An article produced according to claim 1 in which the first-named substrate is a polyimide film.
Claim 14
Dependent Claim
15 words
An article produced according to claim 1 in which the first-named substrate is a metal.
Claim 15
Independent Claim
110 words
A method of bonding a polyimide film to a substrate which comprises placing therebetween a prepreg composed of a fibrous substrate coated and impregnated with a tacky polyimide precursor of (a) a substantially equimolar mixture of (i) 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane or 2,2-bis[4(3-aminophenoxy)phenyl]hexafluoropropane, or both, and (ii) lower alkyl diester of benzophenone tetracarboxylic acid; (b) about 2 to 50 weight percent of polyamic acid polyamide producible from components (i) and (ii); and (c) about 1 to 50 weight percent of solvent; applying heat to cause the formation of the polyimide in situ while maintaining the polyimide film and first-named substrate in intimate contact with the curing prepreg; and then cooling the resultant article.
Claim 16
Independent Claim
110 words
A method of bonding a polyimide film to a substrate which comprises placing therebetween a prepreg composed of a fibrous substrate coated and impregnated with a tacky polyimide precursor of (a) a substantially equimolar mixture of (i) 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane or 2,2-bis[4(3-aminophenoxy)phenyl]hexafluoropropane, or both, and (ii) lower alkyl diester of benzophenone tetracarboxylic acid; (b) about 2 to 50 weight percent of polyamic acid polyamide producible from components (i) and (ii); and (c) about 1 to 50 weight percent of solvent; applying heat to cause the formation of the polyimide in situ while maintaining the polyimide film and first-named substrate in intimate contact with the curing prepreg; and then cooling the resultant article.
Claim 17
Dependent Claim
14 words
The method of claim 14 in which the 2,2-bix[4(aminophenoxy)phenyl]hexafluoropropane of the precursor is 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane.
Claim 18
Dependent Claim
19 words
The method of claim 14 where in the fibrous substrate of the prepreg is composed of unidirectionally aligned fibers.
Claim 19
Dependent Claim
17 words
The method of claim 14 wherein the fibrous substrate of the prepreg is a strip or tape.
Claim 20
Dependent Claim
23 words
The method of claim 14 wherein the surfaces of the metal and the substrate between which the prepreg is placed are not pre-abraded.
Claim 21
Dependent Claim
14 words
The method of claim 14 in which the first-named substrate is a polyimide film.
Claim 22
Dependent Claim
7 words
An article produced according to claim 19.
Claim 23
Dependent Claim
21 words
The method of claim 14 in which the polyimide film and the substrate are polyimide films of pyromellitic dianhydride and oxydianiline.
Claim 24
Dependent Claim
7 words
An article produced according to claim 21.
Claim 25
Dependent Claim
20 words
An article produced according to claim 14 wherein the fibrous substrate of the prepreg is composed of unidirectionally aligned fibers.
Claim 26
Dependent Claim
19 words
An article produced according to claim 14 wherein the fibrous substrate of the prepreg is a strip or tape.
References Cited (Backward Citations)
US3654227A
Cited
US3511807A
Cited
GB1373906A
Cited
US4124651A
Cited
US4111906A
Cited
US4543295A
Cited
US4426463A
Cited
US4442283A
Cited
US4444823A
Cited
US4690999A
Cited
US4725642A
Cited
US4755424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |