Patent US2402053A successfully refreshed from Google Patents.
US4148969A
Expired / Lapsed
US
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Polyparabanic acid/copper foil laminates obtained by direct solution casting
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1977-09-12
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Granted: 1979-04-10
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Expires: 1997-09-12
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
2026-10-24 16:13
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H01B3/004; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A process of forming flexible coated articles of polyparabanic acid strongly adhered to a supportive copper substrate which comprises in combination the steps of: (a) forming a solution of polyparabanic acid with an inherent viscosity of 0.4-2.5 having a viscosity of from 1,000 to 50,000 cps, Brookfield viscosity, at least 25% of the polyparabanic acid being of an aromatic type, (b) coating a thin layer of said solution directly on a copper substrate in the absence of intermediate adhesives, (c) heating said thin layer of polyparabanic acid solution to evaporate said solvent from said film and (d) recovering a flexible coated article having a relatively dry layer of polyparabanic acid strongly adhered directly to said copper substrate.
Claim 2
Dependent Claim
117 words
A process of forming flexible coated articles of polyparabanic acid strongly adhered to a supportive copper substrate which comprises in combination the steps of: (a) forming a solution of polyparabanic acid with an inherent viscosity of 0.4-2.5 having a viscosity of from 1,000 to 50,000 cps, Brookfield viscosity, at least 25% of the polyparabanic acid being of an aromatic type, (b) coating a thin layer of said solution directly on a copper substrate in the absence of intermediate adhesives, (c) heating said thin layer of polyparabanic acid solution to evaporate said solvent from said film and (d) recovering a flexible coated article having a relatively dry layer of polyparabanic acid strongly adhered directly to said copper substrate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said substrate is copper foil.
Claim 4
Dependent Claim
26 words
The process of claim 1, wherein said polyparabanic acid layer has a thickness of 0.1-8 mils and said copper foil has a thickness of 1/2-10 mils.
Claim 5
Dependent Claim
9 words
The article produced by the process of claim 3.
Claim 6
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 7
Dependent Claim
9 words
The article produced by the process of claim 5.
Claim 8
Dependent Claim
50 words
A coated article suitable as a precursor for a laminate article comprising one component of the ultimate laminate coated with a layer of polyparabanic acid having an inherent viscosity of at least 0.05 but less than 0.4 wherein at least 25% of the polyparabanic acid is of an aromatic type.
Claim 9
Dependent Claim
50 words
A coated article suitable as a precursor for a laminate article comprising one component of the ultimate laminate coated with a layer of polyparabanic acid having an inherent viscosity of at least 0.05 but less than 0.4 wherein at least 25% of the polyparabanic acid is of an aromatic type.
Claim 10
Dependent Claim
12 words
The article of claim 7 wherein said coated component is metallic copper.
Claim 11
Dependent Claim
11 words
The article of claim 8 wherein said copper is copper foil.
Claim 12
Dependent Claim
36 words
Coated articles comprising copper coated with a polyparabanic acid having an inherent viscosity in the range of about 0.4 to about 2.5 and wherein at least 25% of the polyparabanic acid is of an aromatic type.
Claim 13
Dependent Claim
36 words
Coated articles comprising copper coated with a polyparabanic acid having an inherent viscosity in the range of about 0.4 to about 2.5 and wherein at least 25% of the polyparabanic acid is of an aromatic type.
Claim 14
Dependent Claim
11 words
The article of claim 10 wherein said copper is copper foil.
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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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |