US4799996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallizable substrate composites and printed circuits produced therefrom
Assignee: Huntsman Advanced Materials Americas LLC
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Filing: 1987-07-27
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Granted: 1989-01-24
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Expires: 2007-07-27
Abstract
Abstract Substrate composites, well adopted for the production of metallized printed circuits and facilely prepared by, e.g., papermaking procedures, include a central core layer comprising fibrous cellulosic material or flaked mica within a matrix of a thermosetting resin binder, said central core element having coextensively laminated to at least one of the face surfaces thereof, a lamina of a thermosetting resin comprising non-conductive metal oxide filler material distributed therethrough, and said metal oxide being borohydride reduceable and reactive to form unstable metal hydride intermediates.
Inventors
- 👤 Robert Cassat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:54
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K3/00; H05K3/10; H05K3/18; H05K3/188; H05K1/0313; H05K1/0353; H05K1/0373; H05K3/38; H05K3/386; H05K3/387; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/0236; H05K2201/0242; H05K2201/0245; H05K2201/0275; H05K2201/0284; H05K2201/0293; H05K2203/00; H05K2203/11; H05K2203/1157; H05K2203/12; H05K2203/125; H05K3/105; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
170 words
A process for the production of a substrate composite, said composite including a central core layer comprising fibrous cellulosic material or flaked mica within a matrix of a thermosetting resin binder, said central core element having coextensively laminated to at least one of the face surfaces thereof, a lamina of a thermosetting resin comprising a particulate array of non-conductive metal oxide filler material distributed therethrough, at least a portion of said metal oxide being borohydride reduced to form unstable metal hydride intermediates into the depth of said lamina, said process comprising (i) preparing an aqueous papermaking slurry of a powder of said thermosetting resin and said fibrous cellulosic material or said flaked mica comprising said central core layer, (ii) papermaking a sheet member of same by removal of water therefrom, (iii) consolidating and drying said sheet member, (iv) coating at least one of the face surfaces of said sheet member with said thermosetting resin comprising non-conductive metal oxide filler material distributed therethrough, and (v) thence consolidating said coated sheet member.
Claim 2
Dependent Claim
170 words
A process for the production of a substrate composite, said composite including a central core layer comprising fibrous cellulosic material or flaked mica within a matrix of a thermosetting resin binder, said central core element having coextensively laminated to at least one of the face surfaces thereof, a lamina of a thermosetting resin comprising a particulate array of non-conductive metal oxide filler material distributed therethrough, at least a portion of said metal oxide being borohydride reduced to form unstable metal hydride intermediates into the depth of said lamina, said process comprising (i) preparing an aqueous papermaking slurry of a powder of said thermosetting resin and said fibrous cellulosic material or said flaked mica comprising said central core layer, (ii) papermaking a sheet member of same by removal of water therefrom, (iii) consolidating and drying said sheet member, (iv) coating at least one of the face surfaces of said sheet member with said thermosetting resin comprising non-conductive metal oxide filler material distributed therethrough, and (v) thence consolidating said coated sheet member.
Claim 3
Dependent Claim
19 words
The process as defined by claim 1, wherein said consolidating step (v) concomitantly effects hardening of said thermosetting resins.
Claim 4
Dependent Claim
26 words
The process as defined by claim 1, wherein said central core layer essentially consists of fibrous cellulosic material within a matrix of a thermosetting resin binder.
Claim 5
Dependent Claim
25 words
The process as defined by claim 1, wherein said central core layer essentially consists of flaked mica within a matrix of a thermosetting resin binder.
Claim 6
Dependent Claim
19 words
The process as defined by claim 1, wherein said central core layer further comprises inert filler material distributed therethrough.
Claim 7
Dependent Claim
19 words
The process as defined by claim 3, wherein said central core layer further comprises inert filler material distributed therethrough.
Claim 8
Dependent Claim
19 words
The process as defined by claim 4, wherein said central core layer further comprises inert filler material distributed therethrough.
Claim 9
Dependent Claim
21 words
The process as defined by claim 1, wherein said thermosetting resin binder comprising said central core layer comprises a phenolic resin.
Claim 10
Dependent Claim
24 words
The process as defined by claim 1, wherein said at least one thermosetting resin lamina comprises a phenolic resin, epoxide resin, or imido resin.
Claim 11
Dependent Claim
20 words
The process as defined by claim 1, wherein said at least one thermosetting resin lamina comprises porous cellulosic reinforcing means.
Claim 12
Dependent Claim
22 words
The process as defined by claim 9, wherein said at least one thermosetting resin lamina comprises the polymer of an imido prepolymer.
Claim 13
Dependent Claim
15 words
The process as defined by claim 1, wherein said non-conductive metal oxide comprises cuprous oxide.
Claim 14
Dependent Claim
22 words
The process as defined by claim 1, wherein said central core layer comprises from 50 to 90% of the total weight thereof.
Claim 15
Dependent Claim
22 words
The process as defined by claim 13, wherein said central core layer has a thickness ranging from about 1 to 3 mm.
Claim 16
Dependent Claim
27 words
The process as defined by claim 13, wherein said central core layer comprises from 40 to 70% by weight of said fibrous cellulosic material or flaked mica.
Claim 17
Dependent Claim
26 words
The process as defined by claim 1, wherein said at least one thermosetting resin lamina comprises from 30 to 70% by weight of particulate metal oxide.
Claim 18
Dependent Claim
21 words
The process as defined by claim 1, wherein said at least one thermosetting resin lamina further comprises a filler material therefor.
Claim 19
Dependent Claim
33 words
The process as defined by claim 1, wherein a fraction of the metal oxide filler material comprising said at least one thermosetting resin lamina is physically exposed at the outer face surface thereof.
Claim 20
Dependent Claim
23 words
The process as defined by claim 1, wherein at least a portion of said metal oxide filler material is reduced to free metal.
Claim 21
Dependent Claim
25 words
The process as defined by claim 19, wherein the substrate composite further comprises an additive metallic overlayer confronting said at least one thermosetting resin lamina.
Claim 22
Dependent Claim
15 words
The process as defined by claim 1, wherein said thermosetting resins are in hardened state.
Claim 23
Dependent Claim
15 words
The process as defined by claim 19, wherein said thermosetting resins are in hardened state.
Claim 24
Dependent Claim
15 words
The process as defined in claim 20, wherein said thermosetting resins are in hardened state.
References Cited (Backward Citations)
US4541894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |