US4868050A
Expired / Lapsed
US
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Interleaf-containing, fiber-reinforced epoxy resin prepreg
Assignee: Ube Corp
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Filing: 1988-02-26
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Granted: 1989-09-19
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Expires: 2008-02-26
Abstract
Abstract Disclosed is an interleaf-containing, fiber-reinforced epoxy resin prepreg, which comprises a fiber-reinforced epoxy resin matrix and an interleaf composed of a polyimide film subjected to a corona discharge treatment and/or a matting treatment. This prepreg is suitable for the production of a composite material which is excellent in mechanical strength characteristics such as interlaminar shear strength and flexural breaking strength and having a high toughness.
Inventors
- 👤 Hideho Tanaka
- 👤 Kazuyoshi Fujii
- 👤 Kazuo Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:05
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/16; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B29C59/00; B29C59/10; B29K; B29K2063/00; B29K2079/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31525; Y10T428/31551; Y10T428/31623; Y10T428/31721
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
An interleaf-containing, fiber-reinforced epoxy resin prepreg comprising a fiber-reinforced epoxy resin matrix layer and an interleaf layer, said interleaf layer composed of a polyimide film which has been subjected to a surface treatment selected from the group consisting of corona discharge treatment, matting treatment and combinations thereof, said polyimide film being a film of a polyimide having an imide skeleton represented by the structural formula ##STR3##
Claim 2
Dependent Claim
66 words
An interleaf-containing, fiber-reinforced epoxy resin prepreg comprising a fiber-reinforced epoxy resin matrix layer and an interleaf layer, said interleaf layer composed of a polyimide film which has been subjected to a surface treatment selected from the group consisting of corona discharge treatment, matting treatment and combinations thereof, said polyimide film being a film of a polyimide having an imide skeleton represented by the structural formula ##STR3##
Claim 3
Dependent Claim
24 words
An interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 1, wherein the thickness of the polyimide film is 5 to 40 μm.
Claim 4
Dependent Claim
30 words
A composite material comprising a plurality of said interleaf-containing, fiber-reinforced epoxy resin prepregs according to claim 1, said plurality of interleaf-containing, fiber-reinforced epoxy resin prepregs being laminated one to another.
Claim 5
Dependent Claim
31 words
A interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 1, wherein the corona discharge treatment is carried out at a discharge quantity of 30 to 150 W/m 2 min.
Claim 6
Dependent Claim
35 words
An interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 1, wherein the matting treatment is carried out so that the surface roughness Ra is in the range of from 0.1 to 0.6 μm.
Claim 7
Dependent Claim
29 words
An interleaf-containing, fiber-reinforced epoxy resin repreg as set forth in claim 1, wherein the polyimide film is one subjected to both the corona discharge treatment and the matting treatment.
Claim 8
Dependent Claim
54 words
An interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 1, wherein the reinforcing fiber is at least one member selected from the group consisting of a glass fiber, a PAN type carbon fiber, a pitch type carbon fiber, an aramid fiber, an alumina fiber, a silicon carbide fiber and an Si-Ti-C-O fiber.
Claim 9
Dependent Claim
26 words
A interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 1, wherein the epoxy resin comprises a polyepoxide, a curing agent and a curing catalyst.
Claim 10
Dependent Claim
42 words
A interleaf-containing, fiber-reinforced epoxy resin prepreg as set forth in claim 8, wherein the polyepoxide is a diglycidyl ether of bisphenol A, a glycidyl compound of cresol novolak or phenol novolak, a glycidyl compound of diaminodiphenylmethane, or a glycidyl compound of aminophenol.
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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |