US4269876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of carbon fibre
Assignee: Rolls Royce PLC
•
Filing: 1980-05-14
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Granted: 1981-05-26
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Expires: 2000-05-14
Abstract
Abstract A method of treating carbon fibre in which the fibre is subjected to a surface removal step followed by a surface deactivation step. The surface deactivation step comprises either removing at least some of the functional groups on the surface of the fibre or rendering those functional groups incapable of forming a chemical bond with a resin matrix material. When such treated fibres are incorporated in a resin matrix, the resultant composite material is provided with enhanced strength properties when compared with similar composite materials containing untreated carbon fibres.
Inventors
- 👤 David J. Lind
- 👤 Valerie J. Coffey
- 👤 Joyce Hallam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:44
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/2964
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
In a method of incorporating carbon fibers in a resin matrix with enhanced strength thereof, the improvement comprising the steps of: (1) subjecting the fiber to a surface removal step in which the surface layer of the fiber is removed together with any flaws therein to leave functional groups on the thus-exposed surface of said fiber and subsequently (2) deactivating the fiber surface wherein at least some of the functional groups on the thus-exposed surface of said fiber are rendered incapable of forming a chemical bond with said resin matrix by coating said fiber with a polymer which is incapable of forming a chemical bond with either the functional groups on said thus-exposed fiber surface or said resin matrix material and wherein said polymer coating provides a physical barrier to chemical bonding between such functional groups on said thus exposed fiber surface and said resin matrix material.
Claim 2
Dependent Claim
147 words
In a method of incorporating carbon fibers in a resin matrix with enhanced strength thereof, the improvement comprising the steps of: (1) subjecting the fiber to a surface removal step in which the surface layer of the fiber is removed together with any flaws therein to leave functional groups on the thus-exposed surface of said fiber and subsequently (2) deactivating the fiber surface wherein at least some of the functional groups on the thus-exposed surface of said fiber are rendered incapable of forming a chemical bond with said resin matrix by coating said fiber with a polymer which is incapable of forming a chemical bond with either the functional groups on said thus-exposed fiber surface or said resin matrix material and wherein said polymer coating provides a physical barrier to chemical bonding between such functional groups on said thus exposed fiber surface and said resin matrix material.
Claim 3
Dependent Claim
21 words
The method of incorporating carbon fibers in a resin matrix as claimed in claim 1, wherein said polymer coating is polethylene.
References Cited (Backward Citations)
GB1124807A
Cited
US3476703A
Cited
US3720536A
Cited
US3754957A
Cited
US3855174A
Cited
US3964952A
Cited
US3778334A
Cited
JPS4825065A
Cited
US4009305A
Cited
US3914504A
Cited
US4073869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |