US4446191A
Expired / Lapsed
US
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Laminates comprising prepregs metal clad
Assignee: Hitachi Ltd
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Filing: 1981-10-23
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Granted: 1984-05-01
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Expires: 2001-10-23
Abstract
Abstract A laminate produced by molding under heat and pressure a plurality of prepregs obtained by impregnating a resin into a composite fabric, either woven or nonwoven, comprising aromatic polyamide fibers and glass fibers has a low linear expansion coefficient and excellent interlaminar strength.
Inventors
- 👤 Yasuo Miyadera
- 👤 Atsushi Fujioka
- 👤 Tetsuo Kumazawa
- 👤 Doi Hiroaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:02
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B32B15/00; B32B15/14; B32B15/20; B32B5/02; B32B5/022; C; C08; C08J; C08J5/00; C08J5/04; C08J5/047; C08J5/24; C08J5/247; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/0269; B32B2262/10; B32B2262/101; B32B2262/14; B32B2305/00; B32B2305/07; B32B2305/076; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/029; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/313; Y10T442/3138; Y10T442/3382; Y10T442/3415; Y10T442/3431; Y10T442/60; Y10T442/608; Y10T442/654; Y10T442/656
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
55 words
A metal-clad laminate produced by impregnating composite fabric comprising 30-95% by weight of aromatic polyamide fiber and 5-70% by weight of glass fiber arranged together, with a resin to form a prepreg, laminating a plurality of said prepregs together with at least one metallic foil, and molding the laminated metal-clad prepregs under heat and pressure.
Claim 2
Dependent Claim
55 words
A metal-clad laminate produced by impregnating composite fabric comprising 30-95% by weight of aromatic polyamide fiber and 5-70% by weight of glass fiber arranged together, with a resin to form a prepreg, laminating a plurality of said prepregs together with at least one metallic foil, and molding the laminated metal-clad prepregs under heat and pressure.
Claim 3
Dependent Claim
38 words
A laminate according to claim 1, wherein said composite fabric is composite cloth obtained by weaving combination yarns obtained by twisting one or more yarns of aromatic polyamide fiber together with one or more yarns of glass fiber.
Claim 4
Dependent Claim
57 words
A laminate according to claim 1, wherein said composite fabric is a nonwoven fabric prepared by cutting the combination yarn obtained from twisting one or more yarns of aromatic polyamide fiber together with one or more yarns of glass fiber and randomly arranging the cut yarns together so as to provide a mat of a uniform thickness.
Claim 5
Dependent Claim
33 words
A laminate according to claim 1, wherein said composite fabric is a composite union cloth obtained by weaving one or more yarns of aromatic polyamide fiber and glass fiber alternately one by one.
Claim 6
Dependent Claim
30 words
A laminate according to claim 1, 2, 3, or 4, wherein said aromatic polyamide fiber is spun from a polymer selected from poly(p-phenyleneterephthalamide), poly(p-benzamide), and copolymers of p-phenyleneterephthalamide or p-benzamide.
Claim 7
Dependent Claim
22 words
A laminate according to claim 5, wherein the ratio of diameter of the aromatic polyamide fiber to the glass fiber is 1:0.1-1.2.
Claim 8
Dependent Claim
19 words
A laminate according to claim 2, wherein the number of twist of said combination yarn is 1-15 turns/25 mm.
Claim 9
Dependent Claim
16 words
A laminate according to claim 7, wherein the fineness of said combination yarn is 10-150 tex.
Claim 10
Dependent Claim
19 words
A laminate according to claim 1, wherein said resin is selected from an epoxy resin and a polyimide resin.
Claim 11
Dependent Claim
17 words
A laminate according to claim 1, wherein the resin content in the prepreg is 30-70% by volume.
Claim 12
Dependent Claim
17 words
A laminate according to claim 1, wherein said laminate is overlaid with one or more copper foils.
Claim 13
Dependent Claim
47 words
A copper-clad laminate comprising a plurality of composite fabric-reinforced resin prepregs laminated together with and interposed between copper foils, said composite fabric being a woven cloth formed of combination yarns containing 30-95% by weight of aromatic polyamide yarn twisted together with 5-70% by weight of glass yarn.
Claim 14
Dependent Claim
47 words
A copper-clad laminate comprising a plurality of composite fabric-reinforced resin prepregs laminated together with and interposed between copper foils, said composite fabric being a woven cloth formed of combination yarns containing 30-95% by weight of aromatic polyamide yarn twisted together with 5-70% by weight of glass yarn.
Claim 15
Dependent Claim
23 words
A laminate according to claim 12, wherein said resin is selected from the group consisting of an epoxy resin and a polyimide resin.
Claim 16
Dependent Claim
30 words
A laminate according to claim 12, wherein the resin content of each prepreg is 30-70% by volume and the number of twists of said combination yarn is 1-15 turn/25 mm.
Claim 17
Dependent Claim
102 words
A copper-clad laminate produced by impregnating a composite fabric comprising 30-95% by weight of aromatic polyamide fiber and 5-70% by weight of glass fiber with a resin to form a prepreg, laminating a plurality of the resulting prepregs together, and molding the laminated prepregs under heat and pressure; said composite fabric being a composite cloth obtained by weaving a combination yarn obtained by twisting one or more yarns of aromatic polyamide fiber together with one or more yarns of glass fiber and the resulting laminate being overlaid and bonded with one or more copper foils and being suitable for mounting chips thereon.
Claim 18
Dependent Claim
102 words
A copper-clad laminate produced by impregnating a composite fabric comprising 30-95% by weight of aromatic polyamide fiber and 5-70% by weight of glass fiber with a resin to form a prepreg, laminating a plurality of the resulting prepregs together, and molding the laminated prepregs under heat and pressure; said composite fabric being a composite cloth obtained by weaving a combination yarn obtained by twisting one or more yarns of aromatic polyamide fiber together with one or more yarns of glass fiber and the resulting laminate being overlaid and bonded with one or more copper foils and being suitable for mounting chips thereon.
Claim 19
Dependent Claim
46 words
A laminate according to claim 15, wherein the resin is selected from the group consisting of an epoxy resin and a polyamide resin, the resin content of each prepreg is 30-70% by volume; and the number of twists of said combination yarn is 1-15 turns/25 mm.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |