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US4868071A
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US
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Thermally stable dual metal coated laminate products made from textured polyimide film
Assignee: Parlex Corp
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Filing: 1988-02-16
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Granted: 1989-09-19
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Expires: 2008-02-16
Abstract
Abstract Both surfaces of a uniformly and completely textured polyimide sheet are coated with a layer of electroless nickel or cobalt and a subsequent layer of electrolytically applied copper yielding an adhesiveless laminate useful in the production of electronic circuitry. The copper and nickel or cobalt layers are strongly bonded to the textured polyimide sheet to the extent that the laminate exceeds bond strength requirements as measured by current standard peel strength tests of the Institute for Interconnecting and Packaging Electronic Circuits (IPC) for both initial and post solder float adhesion, as well as a modification of IPC test 2.4.9 method E for resistance to thermal cycling.
Inventors
- 👤 Daniel P. Walsh
- 👤 Philip D. Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:03
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22; C25; C25D; C25D5/00; C25D5/54; C25D5/56; H05K3/38; H05K3/381; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0344; H05K2203/00; H05K2203/12; H05K2203/122; H05K3/02; H05K3/022; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291; Y10T428/12944
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, each of said polyimide sheet surfaces having a uniformly and substantially completely frosted or matte appearance and each of said polyimide sheet surfaces being free of an adhesive and having a metal coating comprising an electroless nickel or cobalt coating and an electrolytic copper coating bonded to each of said nickel or cobalt coatings, said laminate sheet product having a peel strength of at least 6.0 lb./in. as measured by IPC Test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC Test 2.4.9 Method C and being capable of passing the IPC Test 2.4.13 for solder float and being capable of passing the Modified Thermal Cycling IPC Test 2.4.9 Method E.
Claim 2
Dependent Claim
138 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, each of said polyimide sheet surfaces having a uniformly and substantially completely frosted or matte appearance and each of said polyimide sheet surfaces being free of an adhesive and having a metal coating comprising an electroless nickel or cobalt coating and an electrolytic copper coating bonded to each of said nickel or cobalt coatings, said laminate sheet product having a peel strength of at least 6.0 lb./in. as measured by IPC Test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC Test 2.4.9 Method C and being capable of passing the IPC Test 2.4.13 for solder float and being capable of passing the Modified Thermal Cycling IPC Test 2.4.9 Method E.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein said electroless coating is a nickel containing alloy.
Claim 4
Dependent Claim
18 words
The product of claim 1 wherein said electroless nickel or cobalt coating is at least 0.15 μm thick.
Claim 5
Dependent Claim
15 words
The product of claim 1 wherein said electroless metal coating is a cobalt containing alloy.
Claim 6
Dependent Claim
27 words
The product of any one of claims 1, 2, 3 or 4 wherein each of said metal coatings is present in a pattern simulating an electronic circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |