US4985294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed wiring board
Assignee: Yokohama Rubber Co Ltd
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Filing: 1989-08-24
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Granted: 1991-01-15
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Expires: 2009-08-24
Abstract
Abstract Composite films for use in printed wiring boards are comprised of an insulating layer and a copper foil laminated thereover, the insulating layer being made up predominantly of a selected epoxy resin and a selected acrylonitrile-butadiene rubber, whereby voidlessness, thickness uniformity and insulation adjustment are enhanced. Also disclosed is a method of producing a printed wiring board using the film by a subtractive process.
Inventors
- 👤 Hideo Watanabe
- 👤 Hajime Yamazaki
- 👤 Hiroyuki Wakamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:35
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/092; H; H05; H05K; H05K1/00; H05K1/02; H05K1/14; B32B15/06; B32B15/20; H05K1/03; H05K1/0313; H05K1/0353; H05K3/00; H05K3/46; H05K3/4644; H05K3/4652; H05K3/4655; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2311/00; B32B2311/12; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0133; H05K2201/0183; H05K2201/0195; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/0358; H05K3/4673; H05K3/4676; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
59 words
A composite film for use in printed wiring boards which comprises an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10.
Claim 2
Dependent Claim
59 words
A composite film for use in printed wiring boards which comprises an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10.
Claim 3
Dependent Claim
10 words
The film of claim 1, the insulating layer being uncured.
Claim 4
Dependent Claim
20 words
The film of claim 1, further including a cured resinous layer interposed between the insulating layer and the copper foil.
Claim 5
Dependent Claim
25 words
The film of claim 3, further including a bonding layer disposed over the insulating layer on one side opposed to the copper foil when cured.
Claim 6
Dependent Claim
29 words
The film of claim 2, the uncured insulating layer having a viscosity of from 10 3 to 10 5 poises at a maximum temperature at the time of lamination.
Claim 7
Dependent Claim
31 words
The film of claim 3, the resinous layer being formed of a mixture of an epoxy resin and an acrylonitrile-butadiene rubber, an epoxy resin, an acrylic resin or a polyimide resin.
Claim 8
Dependent Claim
28 words
The film of claim 4, the bonding layer having a viscosity of from 10 3 to 10 5 poises at a maximum temperature at the time of lamination.
Claim 9
Dependent Claim
66 words
A printed wiring board comprising a substrate and a composite film disposed integrally thereover, the composite film comprising an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10.
Claim 10
Dependent Claim
66 words
A printed wiring board comprising a substrate and a composite film disposed integrally thereover, the composite film comprising an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10.
Claim 11
Independent Claim
77 words
A method of producing a printed wiring board which comprises vacuum-laminating a composite film over a substrate, the composite film comprising an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10 and subsequently curing the resulting laminate with heat.
Claim 12
Independent Claim
77 words
A method of producing a printed wiring board which comprises vacuum-laminating a composite film over a substrate, the composite film comprising an insulating layer and a copper foil laminated thereon in direct contact with said insulating layer, the insulating layer comprising a blend of an epoxy resin and an acrylonitrile-butadiene rubber, the weight ratio of epoxy resin to acrylonitrile-butadiene rubber being in the range of from 30:70 to 90:10 and subsequently curing the resulting laminate with heat.
Claim 13
Dependent Claim
22 words
The method of claim 9, the insulating layer and the copper foil being separately vacuum-laminated one on the other over the substrate.
Claim 14
Dependent Claim
15 words
The method of claim 9, the curing being effected in vacuo or at atmospheric pressure.
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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |