US4087300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing metal-plastic laminate
Assignee: Park Aerospace Corp
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Filing: 1975-07-16
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Granted: 1978-05-02
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Expires: 1995-07-16
Abstract
Abstract At least one conductive metal foil is preliminarily bonded to an electrically insulating resinous substrate by squeezing the layers together under heat and pressure in a continuous mode, as by passing the layers through a nip roll to produce a partially cured resinous layer subjacent to the metal foil. The thus preliminarily bonded laminate is further processed in an autoclave, under heat and pressure, whereby the bonding layer between the metal and the substrate is cured. The laminate formed by this process is useful for metal-clad boards, particularly printed circuit boards. These boards may be either flexible or rigid.
Inventors
- 👤 Edward Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:00
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B37/00; B32B37/0007; B32B37/12; H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2309/00; B32B2309/12; B32B2309/60; B32B2309/62; B32B2311/00; B32B2311/12; B32B2457/00; B32B2457/08; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K1/0393; H05K2203/00; H05K2203/06; H05K2203/068; H05K3/38; H05K3/386
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
19 words
A process for preparing a laminate comprising at least one metallic foil and a resinous substrate consisting essentially of:
Claim 2
Dependent Claim
19 words
A process for preparing a laminate comprising at least one metallic foil and a resinous substrate consisting essentially of:
Claim 3
Dependent Claim
104 words
(a) preliminarily bonding said metal foil and resinous plastic substrate employing a meltable, curable resinous adhesive, said preliminary bonding being carried out under sufficient pressure and temperature such that the metal foil and resinous substrate are thoroughly wetted with the resinous adhesive, to form a preliminarily bonded laminate; and (b) heating said preliminarily bonded laminate in an autoclave for a time sufficient to complete curing and bonding, the pressure in said autoclave being greater than the total vapor pressure generated at the interface of the metal foil and resinous plastic substrate by the curing and heating of said resinous plastic substrate and resinous adhesive.
Claim 4
Dependent Claim
104 words
(a) preliminarily bonding said metal foil and resinous plastic substrate employing a meltable, curable resinous adhesive, said preliminary bonding being carried out under sufficient pressure and temperature such that the metal foil and resinous substrate are thoroughly wetted with the resinous adhesive, to form a preliminarily bonded laminate; and (b) heating said preliminarily bonded laminate in an autoclave for a time sufficient to complete curing and bonding, the pressure in said autoclave being greater than the total vapor pressure generated at the interface of the metal foil and resinous plastic substrate by the curing and heating of said resinous plastic substrate and resinous adhesive.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the meltable, resinous adhesive is a B-stage resin.
Claim 6
Dependent Claim
27 words
The process of claim 1 wherein the resin plastic substrate is flexible and the preliminarily bonded foil and substrate are rolled before being placed in the autoclave.
Claim 7
Dependent Claim
13 words
The process of claim 3 wherein the roll is formed about a mandrel.
Claim 8
Dependent Claim
25 words
The process of claim 3 wherein the substrate is selected from the class consisting of paper and fabric, impregnated with a flexible, electrically insulating resin.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the pressure within the autoclave is from 20 to 250 psi.
Claim 10
Dependent Claim
17 words
The process of claim 6 wherein the pressure within said autoclave is from 75 to 250 psi.
Claim 11
Dependent Claim
17 words
The process of claim 7 wherein the pressure within said autoclave is from 150 to 250 psi.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein the pressure within said autoclave is generated by an inert gas.
Claim 13
Dependent Claim
20 words
The process of claim 1 wherein a metallic foil is bonded to only one side of the resinous plastic substrate.
Claim 14
Dependent Claim
11 words
The process of claim 10 wherein the matallic foil is copper.
Claim 15
Dependent Claim
30 words
The process of claim 10 wherein a silicone treated paper is placed between adjacent layers of the joined metallic foil-resinous plastic substrate while wrapping said joined materials onto a mandrel.
Claim 16
Dependent Claim
36 words
The process of claim 1 wherein a metallic foil is preliminarily bonded to each side of said resinous plastic substrate, and two preliminary bonding steps are employed, one for preliminary bonding of each metallic foil layer.
Claim 17
Dependent Claim
11 words
The process of claim 13 wherein said metallic foil is copper.
Claim 18
Dependent Claim
34 words
The process of claim 1 wherein the temperature within the autoclave is sufficiently high to cure the resinous material in the substrate, but is low enough to prevent substantial degradation of said resinous material.
Claim 19
Dependent Claim
16 words
The process of claim 15 wherein the temperature is from about 250° F to 400° F.
Claim 20
Dependent Claim
34 words
The process of claim 1 wherein the resinous plastic substrate with the preliminarily bonded metal foil is placed in the autoclave as a part of a stack of such preliminarily bonded resinous plastic substrates.
Claim 21
Dependent Claim
15 words
The process of claim 17 wherein the resinous plastic substrate, upon curing, is essentially rigid.
Claim 22
Dependent Claim
16 words
The process of claim 1 wherein the preliminary bonding is carried out in a nip roll.
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |