US3717543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminations of polyimide films to like films and/or to metal foils
Assignee: Image Products Group LLC
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Filing: 1971-01-13
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Granted: 1973-02-20
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Expires: 1991-01-13
Abstract
Abstract A high temperature polyimide film - metal foil laminate and the process for making same is disclosed. The laminate webs are jointed together by an acrylic-epoxy resin adhesive that has been found to be very resistant to delamination of the webs during high temperature applications. The epoxy component of the adhesive is of the low molecular weight epichlorohydrin bisphenol A type having an epoxide equivalent weight of less than 550. The epoxy component is present in a substantial excess in relation to the acrylic component of the adhesive.
Inventors
- 👤 J Sinclair
- 👤 G Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:23
CPC Classifications
B; B32; B32B; B32B27/00; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/28; B32B27/281; H; H05; H05K; H05K3/00; H05K3/38; H05K3/386; B32B2309/00; B32B2309/02; B32B2309/025; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/15; H05K2203/1545; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31725; Y10T428/3175
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A method of forming a laminate of a first web of polyimide film and a second web, comprising the steps of a. supplying one of the webs to a coating stAtion; b. applying to said one web from a solvent solution an adhesive coating having an ammoniated acrylic copolymer component and an epoxy component; c. said epoxy component being present in a substantial excess in relation to the quantity required to fully react with the acrylic copolymer; d. removing substantially all the solvent from said adhesive film; e. combining said adhesively coated web with the second web to form a lamination; and f. curing the adhesive coating by subjecting said lamination to elevated temperatures for a predetermined time.
Claim 2
Independent Claim
118 words
A method of forming a laminate of a first web of polyimide film and a second web, comprising the steps of a. supplying one of the webs to a coating stAtion; b. applying to said one web from a solvent solution an adhesive coating having an ammoniated acrylic copolymer component and an epoxy component; c. said epoxy component being present in a substantial excess in relation to the quantity required to fully react with the acrylic copolymer; d. removing substantially all the solvent from said adhesive film; e. combining said adhesively coated web with the second web to form a lamination; and f. curing the adhesive coating by subjecting said lamination to elevated temperatures for a predetermined time.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein a. said curing step includes the application of heat and pressure simultaneously to the webs for a period of about 5 minutes.
Claim 4
Dependent Claim
16 words
The method of claim 2, wherein a. said heat and pressure are applied at about 450*F.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein a. said elevated temperatures are from about 200*F. to about 260*F.
Claim 6
Dependent Claim
14 words
The method of claim 4, wherein a. said predetermined time is approximately 16 hours.
Claim 7
Independent Claim
97 words
The method of forming a polyimide film-metal foil laminate which includes the steps of a. supplying said polyimide film to a coating station; b. coating said polyimide web with an adhesive solvent solution containing a dry solids basis, 100 parts of an ammoniated acrylic copolymer and 46-100 parts of an epoxy resin; c. removing substantially all the solvent from said adhesive film; d. laminating the adhesive coated polyimide film to said metal foil; e. said laminating step including the chemical reaction of epoxy groups of said epoxy resin with the amine groups of said ammoniated acrylic copolymer.
Claim 8
Independent Claim
97 words
The method of forming a polyimide film-metal foil laminate which includes the steps of a. supplying said polyimide film to a coating station; b. coating said polyimide web with an adhesive solvent solution containing a dry solids basis, 100 parts of an ammoniated acrylic copolymer and 46-100 parts of an epoxy resin; c. removing substantially all the solvent from said adhesive film; d. laminating the adhesive coated polyimide film to said metal foil; e. said laminating step including the chemical reaction of epoxy groups of said epoxy resin with the amine groups of said ammoniated acrylic copolymer.
Claim 9
Dependent Claim
30 words
The method of claim 6, wherein a. said chemical reaction is promoted by the exposure of the laminate to temperatures between about 200*F. and about 260*F. for about 16 hours.
Claim 10
Dependent Claim
28 words
The method of claim 6, wherein a. said chemical reaction is promoted by the exposure of the laminate to a temperature of about 450*F. for about 5 minutes.
Claim 11
Dependent Claim
104 words
A laminate structure having high temperature integrity comprising a. a layer of polyimide film, adhered to a b. substrate of metal foil by an c. intermediate layer of a cured adhesive composition; d. said cured adhesive comprising the reaction product of approximately 100 parts by weight of an ammoniated acrylic copolymer component and 46-100 parts by weight of an epoxy resin component having an epoxide equivalent weight of less than about 550; e. said adhesive composition having a substantial excess of epoxy reactive groups of at least 2.2 to 1 or greater for each reactive amine group of the said ammoniated acrylic copolymer component.
Claim 12
Dependent Claim
104 words
A laminate structure having high temperature integrity comprising a. a layer of polyimide film, adhered to a b. substrate of metal foil by an c. intermediate layer of a cured adhesive composition; d. said cured adhesive comprising the reaction product of approximately 100 parts by weight of an ammoniated acrylic copolymer component and 46-100 parts by weight of an epoxy resin component having an epoxide equivalent weight of less than about 550; e. said adhesive composition having a substantial excess of epoxy reactive groups of at least 2.2 to 1 or greater for each reactive amine group of the said ammoniated acrylic copolymer component.
Claim 13
Dependent Claim
19 words
The laminate of claim 9, wherein a. said acrylic copolymer is a copolymer of methyl methacrylate and glycidyl methacrylate.
Claim 14
Dependent Claim
28 words
The laminate of claim 10, wherein a. said epoxy resin includes a low molecular weight epichlorohydrin bisphenol A type epoxy compound having an epoxide equivalent of about 190.
Claim 15
Dependent Claim
28 words
The laminate of claim 11, wherein a. said epoxy resin further includes a small amount of a brominated epoxy compound having an epoxide equivalent weight of about 500.
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |