US4443566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sized reinforcing fibers suitable for use in composites of improved impact resistance
Assignee: SUBJECT TO AGREEMENT RECITED SEE DOCUMENT FOR DETAILS
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Filing: 1983-04-25
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Granted: 1984-04-17
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Expires: 2003-04-25
Abstract
Abstract Improved reinforcing fibers such as carbon fibers are provided which may be employed in composites to improve the impact resistance thereof. The fibers disclosed are coated with a sizing composition comprised of a blend of an epoxy resin and a organophosphazene elastomer.
Inventors
- 👤 Lincoln Ying
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:46
CPC Classifications
C; C08; C08L; C08L63/00; C08J; C08J5/00; C08J5/04; C08J5/06; C08L85/00; C08L85/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/2933; Y10T428/294; Y10T428/2964; Y10T428/2967; Y10T428/30; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31522; Y10T428/31525; Y10T428/31529; Y10T428/31721
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A reinforcing fiber having a coating on the surface thereof in a concentration of approximately 0.5 to 3.0 percent by weight based on the weight of the reinforcing fiber of a sizing composition which comprises as a first component an epoxy resin and a second component consisting of an organophosphazene elastomer.
Claim 2
Dependent Claim
51 words
A reinforcing fiber having a coating on the surface thereof in a concentration of approximately 0.5 to 3.0 percent by weight based on the weight of the reinforcing fiber of a sizing composition which comprises as a first component an epoxy resin and a second component consisting of an organophosphazene elastomer.
Claim 3
Dependent Claim
22 words
The reinforcing fiber of claim 1 wherein said coating is present in a concentration of approximately 1.1 to 1.5 percent by weight.
Claim 4
Dependent Claim
21 words
The reinforcing fiber of claim 1 wherein said composition comprises an epoxy resin formed by the reaction of epichlorohydrin and bisphenol.
Claim 5
Dependent Claim
25 words
The reinforcing fiber of claim 1 wherein said epoxy resin and said elastomer are present in a weight ratio ranging from approximately 99:1 to 1:99.
Claim 6
Dependent Claim
25 words
The reinforcing fiber of claim 1 wherein said epoxy resin and said elastomer are present in a weight ratio ranging from approximately 4:1 to 1:4.
Claim 7
Dependent Claim
36 words
The reinforcing fiber of claim 1 wherein said fiber is selected from the group consisting of glass fibers, carbon fibers, synthetic polymer fibers, aluminum fibers, boron fibers, titanium fibers, steel fibers, tungsten fibers and ceramic fibers.
Claim 8
Dependent Claim
13 words
The reinforcing fiber of claim 6 wherein said reinforcing fiber comprises carbon fibers.
Claim 9
Dependent Claim
58 words
A composite structure comprising a rigid polymeric matrix having reinforcing fibers incorporated therein which are coated on the surface thereof with approximately 0.5 to 3.0 percent by weight based on the weight of the reinforcing fibers of a sizing composition which comprises as a first component an epoxy resin and a second component consisting of an organophosphazene elastomer.
Claim 10
Dependent Claim
58 words
A composite structure comprising a rigid polymeric matrix having reinforcing fibers incorporated therein which are coated on the surface thereof with approximately 0.5 to 3.0 percent by weight based on the weight of the reinforcing fibers of a sizing composition which comprises as a first component an epoxy resin and a second component consisting of an organophosphazene elastomer.
Claim 11
Dependent Claim
22 words
The composite article of claim 8 wherein said coating is present in a concentration of approximately 1.1 to 1.5 percent by weight.
Claim 12
Dependent Claim
21 words
The composite article of claim 8 wherein said composition comprises an epoxy resin formed by the reaction of epichlorohydrin and bisphenol.
Claim 13
Dependent Claim
25 words
The composite article of claim 8 wherein said epoxy resin and said elastomer are present in a weight ratio ranging from approximately 99:1 to 1:99.
Claim 14
Dependent Claim
25 words
The composite article of claim 8 wherein said epoxy resin and said elastomer and present in a weight ratio ranging from approximately 4:1 to 1:4.
Claim 15
Dependent Claim
18 words
The composite article of claim 8 comprising approximately 50 to 75 percent by weight of said reinforcing fibers.
Claim 16
Dependent Claim
18 words
The composite article of claim 8 comprising approximately 60 to 65 percent by weight of said reinforcing fibers.
Claim 17
Dependent Claim
36 words
The composite article of claim 8 wherein said fiber is selected from the group consisting of glass fibers, carbon fibers, synthetic polymer fibers, aluminum fibers, titanium fibers, steel fibers, boron fibers, tungsten fibers and ceramic fibers.
Claim 18
Dependent Claim
13 words
The composite article of claim 15 wherein said reinforcing fiber comprises carbon fibers.
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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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |