US4364993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sized carbon fibers, and thermoplastic polyester based composite structures employing the same
Assignee: SUBJECT TO AGREEMENT RECITED SEE DOCUMENT FOR DETAILS
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Filing: 1980-07-14
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Granted: 1982-12-21
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Expires: 2000-07-14
Abstract
Abstract The present invention is directed to carbon fibers which are coated on the surface with a sizing agent of either a polyisocyanate, such as polymethylene polyphenyl polyisocyanate, or a sorbitol polyglycidyl ether having a specifically defined total chlorine content and epoxide equivalent weight. The coated carbon fibers are employed to prepare carbon fiber composites wherein the matrix resin is a thermoplastic polyester such as poly(1,4-butylene terephthalate). The matrix resin of the composite exhibits improved bonding with the coated carbon fibers thereby imparting improved interlaminar shear strength to the composite.
Inventors
- 👤 Robert Edelman
- 👤 Paul E. McMahon
- 👤 Gene P. Daumit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08K; C08K3/00; C08K3/02; C08K3/04; C08K9/00; C08K9/04; D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249944; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
At least one carbon fiber having coated on the surface thereof a sizing composition of sorbitol polyglycidyl ether having a total chlorine content of at least 10%, by weight, based on the weight of the sorbitol polyglycidyl ether, and an epoxide equivalent weight of from about 160 to about 230.
Claim 2
Dependent Claim
50 words
At least one carbon fiber having coated on the surface thereof a sizing composition of sorbitol polyglycidyl ether having a total chlorine content of at least 10%, by weight, based on the weight of the sorbitol polyglycidyl ether, and an epoxide equivalent weight of from about 160 to about 230.
Claim 3
Dependent Claim
26 words
The sized carbon fiber of claim 1 wherein the sizing composition comprises from about 0.75 to about 10%, by weight, based on the carbon fiber weight.
Claim 4
Dependent Claim
51 words
The sized carbon fiber of claim 2 wherein the sizing composition is a sorbitol polyglycidyl ether having a total chlorine content of from about 11 to about 20%, by weight, based on the weight of the sorbitol polyglycidyl ether and an epoxide equivalent weight of from about 165 to about 220.
Claim 5
Dependent Claim
89 words
A composite structure comprising a continuous matrix of a thermoplastic polyester comprising a poly (alkylene terephthalate, isophthalate, or mixed terephthalate, isophthalate), said alkylene groups containing from about 2 to about 4 carbon atoms, and a reinforcing agent contiguous and firmly bonded thereto, said reinforcing agent comprising carbon fibers sized with a sizing composition of sorbitol polyglycidyl ether having a total chlorine content of at least 10%, by weight, based on the weight of the sorbitol polyglycidyl ether and an epoxide equivalent weight of from about 160 to about 230.
Claim 6
Dependent Claim
89 words
A composite structure comprising a continuous matrix of a thermoplastic polyester comprising a poly (alkylene terephthalate, isophthalate, or mixed terephthalate, isophthalate), said alkylene groups containing from about 2 to about 4 carbon atoms, and a reinforcing agent contiguous and firmly bonded thereto, said reinforcing agent comprising carbon fibers sized with a sizing composition of sorbitol polyglycidyl ether having a total chlorine content of at least 10%, by weight, based on the weight of the sorbitol polyglycidyl ether and an epoxide equivalent weight of from about 160 to about 230.
Claim 7
Dependent Claim
81 words
The composite structure of claim 4 wherein said reinforcing agent is distributed throughout the continuous matrix, the sizing composition is present on said fibers in an amount of from about 0.75 to about 10%, by weight, based on the weight of said carbon fibers, and wherein the composite structure comprises from about 50 to about 80% by weight sized carbon fibers and correspondingly from about 50 to about 20%, by weight, thermoplastic polyester-matrix, based on the weight of the composite structure.
Claim 8
Dependent Claim
16 words
The composite structure of claim 4 or 5, wherein the thermoplastic polyester comprises poly (1,4-butylene terephthalate).
Claim 9
Dependent Claim
41 words
The composite structure of claim 6 wherein the carbon fibers are sized with a sorbitol polyglycidyl ether having a total chlorine content of from about 11 to about 20% and an epoxide equivalent weight of from about 165 to about 220.
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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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |