US4226913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyparabanic acid/copper foil laminates obtained by direct solution casting
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1978-12-18
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Granted: 1980-10-07
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Expires: 1998-12-18
Abstract
Abstract This invention relates to processes and techniques for forming metal and/or plastic/polyparabanic acid (PPA) laminates particularly for use as a component of electrical and electronic systems, especially as flexible circuit materials. Laminate species not requiring intermediate adhesive layers, not fabricated from preformed PPA films and not requiring subsequent cross-linking or other curing reactions are preferred. Solvent casting of PPA is a preferred method of preparing such laminates.
Inventors
- 👤 Don J. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:01
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B7/00; B32B7/04; B32B7/10; B32B15/20; B32B27/00; B32B27/06; B32B27/08; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0353; H05K1/036; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0358; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0759; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31551; Y10T428/31562; Y10T428/31605; Y10T428/31721
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
111 words
A process of forming coated articles of polyparabanic acid strongly adhered to a supportive substrate which comprises in combination the steps of: (a) forming a solution of polyparabanic acid with an inherent viscosity of 0.4-2.5 and a Brookfield viscosity of from 1000 to 50,000 cps, at least 25% of the polyparabanic acid being of an aromatic type, (b) coating a thin layer of said solution directly on a substrate in the absence of intermediate adhesives, (c) heating said thin layer of polyparabanic acid solution to evaporate the solvent from said film and, (d) recovering a coated article having a relatively dry layer of polyparabanic acid strongly adhered directly to said substrate.
Claim 2
Dependent Claim
111 words
A process of forming coated articles of polyparabanic acid strongly adhered to a supportive substrate which comprises in combination the steps of: (a) forming a solution of polyparabanic acid with an inherent viscosity of 0.4-2.5 and a Brookfield viscosity of from 1000 to 50,000 cps, at least 25% of the polyparabanic acid being of an aromatic type, (b) coating a thin layer of said solution directly on a substrate in the absence of intermediate adhesives, (c) heating said thin layer of polyparabanic acid solution to evaporate the solvent from said film and, (d) recovering a coated article having a relatively dry layer of polyparabanic acid strongly adhered directly to said substrate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said substrate is FEP film.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said substrate is a high temperature resistant polyimide film.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the inherent viscosity of the polyparabanic acid polymer is from 0.6-2.0.
Claim 6
Dependent Claim
10 words
The coated article produced by the process of claim 4.
Claim 7
Dependent Claim
56 words
A coated article suitable as a precursor for a laminate article comprising a layer of polyparabanic acid adhered to a layer of one of FEP or polyimide film said polyparabanic acid having an inherent viscosity of at least 0.05 but less than 0.4 and wherein at least 25% of the polyparabanic acid is an aromatic type.
Claim 8
Dependent Claim
56 words
A coated article suitable as a precursor for a laminate article comprising a layer of polyparabanic acid adhered to a layer of one of FEP or polyimide film said polyparabanic acid having an inherent viscosity of at least 0.05 but less than 0.4 and wherein at least 25% of the polyparabanic acid is an aromatic type.
Claim 9
Dependent Claim
18 words
The article of claim 6 wherein the layer of PPA is strongly adhered to a layer of FEP.
Claim 10
Dependent Claim
18 words
The article of claim 6 wherein the layer of PPA is strongly adhered to a layer of polyimide.
Claim 11
Dependent Claim
12 words
The article of claim 6 wherein the precursor is laminated to copper.
Claim 12
Dependent Claim
23 words
Coated articles comprising FEP film coated with a polyparabanic acid wherein at least 25% of the polyparabanic acid is of the aromatic type.
Claim 13
Dependent Claim
23 words
Coated articles comprising FEP film coated with a polyparabanic acid wherein at least 25% of the polyparabanic acid is of the aromatic type.
Claim 14
Dependent Claim
26 words
Coated articles comprising high temperature resistant polyimide film coated with a polyparabanic acid wherein at least 25% of the polyparabanic acid is of the aromatic type.
Claim 15
Dependent Claim
26 words
Coated articles comprising high temperature resistant polyimide film coated with a polyparabanic acid wherein at least 25% of the polyparabanic acid is of the aromatic type.
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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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |