Patent US5098781A successfully refreshed from Google Patents.
US5098781A
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US
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Thermoplastic film, reinforced hollow glass microsphere reinforced laminates for thin low dielectric constant substrates
Assignee: ULTRASONICS Corp A CORP OF
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Filing: 1990-12-28
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Granted: 1992-03-24
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Expires: 2010-12-28
Abstract
Abstract The present invention is directed to a metal-clad electrical laminate which comprises a core of one or more of a polyetherimide thermoplastic, polyphenylene oxide thermoplastic, or a resinous-filled reinforced substrate. A pair of intermediate layers of hollow glass microsphere-filled polyphenylene oxide/epoxy is bound to either side of the core. Finally, a pair of metal foil layers are bound to the filled intermediate layers to produce the laminate of the present invention. The laminate desirably has a thickness of less than about 0.010 in., a dielectric constant of about 3 or less, and a HGM content in excess of about 10 wt-%. Additionally, the laminate has a softening point sufficiently high to avoid substantial distortion at processing temperatures of around 200°-235° C.
Inventors
- 👤 Michael G. Minnick
- 👤 Rakesh Jain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:20
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/00; B32B27/28; B32B27/285; B32B27/32; B32B27/34; B32B27/36; B32B7/00; B32B7/02; B32B7/04; B32B7/12; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0261; B32B2262/0276; B32B2262/06; B32B2262/062; B32B2262/10; B32B2262/101; B32B2311/00; B32B2311/12; B32B2315/00; B32B2315/08; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0129; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/0242; H05K2201/0254; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249972; Y10T428/249974; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T442/00; Y10T442/60; Y10T442/654; Y10T442/656
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A metal-clad electrical laminate comprising a core of one or more of polyetherimide thermoplastic, polyphenylene oxide thermoplastic, or resin-filled fibrous substrate, a pair of intermediate layers of hollow glass microsphere-filled polyphenylene oxide/epoxy bound to said core, and a pair of metal foil layers bound to said filled intermediate layers.
Claim 2
Dependent Claim
49 words
A metal-clad electrical laminate comprising a core of one or more of polyetherimide thermoplastic, polyphenylene oxide thermoplastic, or resin-filled fibrous substrate, a pair of intermediate layers of hollow glass microsphere-filled polyphenylene oxide/epoxy bound to said core, and a pair of metal foil layers bound to said filled intermediate layers.
Claim 3
Dependent Claim
12 words
The laminate of claim 1 wherein said metal foil layers comprise copper.
Claim 4
Dependent Claim
20 words
The laminate of claim 1 wherein said hollow glass microspheres have a diameter ranging from about 20 to 150 microns.
Claim 5
Dependent Claim
18 words
The laminate of claim 1 which contains greater than about 10% by weight of said hollow glass microspheres.
Claim 6
Dependent Claim
21 words
The laminate of claim 4 wherein the proportion of hollow glass microspheres ranges from about 10% to about 50% by weight.
Claim 7
Dependent Claim
130 words
The laminate of claim 1 wherein said polyphenylene oxide/epoxy comprises (a) between about 25% and 50% of at least one polyphenylene ether or polyphenylene oxide (PPO); (b) between about 40% and 60% of a combination comprising (i) between about 35% and 45% of a brominated upstaged polyepoxide composition comprising the reaction product of a halogen-free diglycidyl ether of a bisphenol and a bisphenol containing bromine as aryl substituents, and (ii) between about 55% and 65% of a polyepoxide composition comprising at least one bisphenol polyglycidyl ether having an average of at most one aliphatic hydroxyl group per molecule and containing between about 10% and 60% bromine as aryl substituents; (c) up to about 25% of a halogen-free epoxidized novolac; (d) a catalytically-effective amount of a catalyst; and (e) inert solvent.
Claim 8
Dependent Claim
15 words
The laminate of claim 1 which has a thickness of less than about 0.25 mm.
Claim 9
Dependent Claim
11 words
The laminate of claim 1 wherein said core comprises polyetherimide thermoplastic.
Claim 10
Dependent Claim
12 words
The laminate of claim 1 wherein said core comprises polyphenylene oxide thermoplastic.
Claim 11
Dependent Claim
34 words
The laminate of claim 1 wherein said polyphenylene oxide/epoxy comprises between about 25% and 70% of at least one polyphenylene ether or polyphenylene oxide and between about 30% and 75% of a brominated epoxy.
Claim 12
Dependent Claim
23 words
The laminate of claim 1 wherein said fibrous substrate is one or more of glass, quartz, polyester, polyamide, polypropylene, cellulose, nylon, or acrylic.
Claim 13
Dependent Claim
13 words
The laminate of claim 11 wherein said resin comprises a polyphenylene oxide/epoxy resin.
Claim 14
Dependent Claim
12 words
The laminate of claim 11 wherein said resin comprises a polyester resin.
Claim 15
Dependent Claim
15 words
The laminate of claim 13 wherein said polyester resin comprises a liquid crystal polyester resin.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
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