Patent CA1070575A successfully refreshed from Google Patents.
CA1070575A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Polyparabanic acid laminates
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-03-19
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Granted: 1980-01-29
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Expires: 1995-03-19
Abstract
Abstract ABSTRACT OF DISCLOSURE 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 pre-formed 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
CA
Data Source
google_patents
Last Synchronized
2026-11-08 04:54
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/386; B; B05; B05D; B05D7/00; B05D7/02; B05D7/04; B05D7/14; B05D7/16; C; C08; C08J; C08J2479/00; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A process of forming laminate articles of poly-parabanic acid and strongly adherent to a supportive substrate which comprises in combination the steps of: a) forming a solution of polyparabanic acid having a viscosity of from 1,000 to 50,000 cps, (Brookfield viscosity); 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 said solvent from said film; and d) recovering a laminate having a relatively dry layer of polyparabanic acid having an inherent viscosity of 0.4 to 2.5 strongly adhered directly to said substrate.
Claim 2
Dependent Claim
102 words
A process of forming laminate articles of poly-parabanic acid and strongly adherent to a supportive substrate which comprises in combination the steps of: a) forming a solution of polyparabanic acid having a viscosity of from 1,000 to 50,000 cps, (Brookfield viscosity); 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 said solvent from said film; and d) recovering a laminate having a relatively dry layer of polyparabanic acid having an inherent viscosity of 0.4 to 2.5 strongly adhered directly to said substrate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said substrate is copper foil.
Claim 4
Dependent Claim
30 words
The process of claim 2, wherein said polyparabanic acid layer has a thickness of 0.1 to 8 mils and said copper layer has a thickness of 1/2 to 10 mils.
Claim 5
Dependent Claim
29 words
A coated precursor for a laminate article comprising one component of the ultimate laminate coated with a layer of polyparabanic acid having an inherent viscosity of 0.4 to 2.5.
Claim 6
Dependent Claim
29 words
A coated precursor for a laminate article comprising one component of the ultimate laminate coated with a layer of polyparabanic acid having an inherent viscosity of 0.4 to 2.5.
Claim 7
Dependent Claim
52 words
The coated precursor for a laminate article as claimed in claim 4 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 percent of the polyparabanic acid is of an aromatic type.
Claim 8
Dependent Claim
15 words
The coated precursor of claim 4 or 5 wherein said coated component is metallic copper.
Claim 9
Dependent Claim
15 words
The coated precursor of claim 4 or 5 wherein said coated component is copper foil.
Claim 10
Dependent Claim
18 words
Coated articles comprising copper coated with a polyparabanic acid layer having an inherent viscosity of 0.4 to 2.5.
Claim 11
Dependent Claim
18 words
Coated articles comprising copper coated with a polyparabanic acid layer having an inherent viscosity of 0.4 to 2.5.
Claim 12
Dependent Claim
45 words
Coated articles as claimed in claim 8 comprising copper coated with a polyparabanic acid wherein at least 25 percent of the polyparabanic acid is of an aromatic type and the inherent viscosity of the polyparabanic acid layer is at least 0.05 but less than 0.4.
Claim 13
Dependent Claim
13 words
The article of claim 8 or 9 wherein said copper is copper foil.
References Cited (Backward Citations)
No citation records indexed.
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