US3762941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of carbon fiber surface characteristics
Assignee: Celanese Corp
•
Filing: 1971-05-12
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Granted: 1973-10-02
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Expires: 1991-05-12
Abstract
Abstract A process is provided for modifying the surface characteristics of a carbonaceous fibrous material (i.e., either amorphous carbon or graphitic carbon) and to thereby facilitate enhanced adhesion between the carbonaceous fibrous material and a matrix material. The carbonaceous fibrous material is coated with a compact polyphenylene polymer coating which is deposited thereon upon contact with an excited gas species generated by applying high frequency electrical energy in pulsed form to an inert gas in the presence of at least one aromatic compound. The coating step is efficiently conducted at a temperature of about 0 to 150* C. and at a pressure within the coating zone of about 1 to 3 atmospheres. Composite articles of enhanced interlaminar shear strength may be formed by incorporating the fibers modified in accordance with the present process in a resinous matrix material.
Inventors
- 👤 K Hou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:29
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
14 words
A process according to claim 1 wherein said carbonaceous fibrous material includes graphitic carbon.
Claim 2
Dependent Claim
12 words
A process according to claim 1 wherein said inert gas is monoatomic.
Claim 3
Dependent Claim
25 words
A process according to claim 3 wherein said monoatomic inert gas is selected from the group consisting of argon, helium, and mixtures of the foregoing.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein said aromatic compound is benzene.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein said aromatic compound is toluene.
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein said aromatic compound is styrene.
Claim 7
Dependent Claim
12 words
A process according to claim 1 wherein said aromatic compound is aniline.
Claim 8
Dependent Claim
16 words
A process according to claim 1 wherein said coating zone is provided at substantially atmospheric pressure.
Claim 9
Dependent Claim
31 words
A process according to claim 1 wherein said electrical power in pulsed form applied to said inert gas is of the radio frequency range from about 1.0 KHz. to 30 MHz.
Claim 10
Dependent Claim
217 words
A process for the modification of the surface characteristics of a carbonaceous fibrous material containig at least about 90 per cent carbon by weight and exhibiting a predominantly graphitic X-ray diffraction pattern comprising: a. providing in a coating zone at a pressure of about 1 to 3 atmospheres an inert gas selected from the group consisting of argon, helium, nitrogen, and mixtures of the foregoing and at least one aromatic compound having from 1 to 4 six member carbon rings which is capable of undergoing polymerization to form a polyphenylene polymer, b. applying an a.c. signal having an amplitude of from about 500 v. to 10 Kv. peak-to-peak and a frequency of from about 0.5 KHz. to 2500 MHz. to said inert gas in pulses of from about 0.1 microsecond to 10 milliseconds duration at a pulse repetition rate of about 0.1 KHz. to 20 MHz. sUfficient to form an excited gas species within said coating zone while maintaining the temperature in said zone at about 20*to 100* C., and c. continuously passing a continuous length of said carbonaceous fibrous material through said excited gas species and said aromatic compound in said coating zone until a coating of polyphenylene polymer is deposited on said carbonaceous fibrous material having a thickness of about 50 to 250 angstrom units.
Claim 11
Dependent Claim
21 words
A process according to claim 11 wherein said carbonaceous fibrous material contains at least about 99 per cent carbon by weight.
Claim 12
Dependent Claim
12 words
A process according to claim 11 wherein said inert gas is argon.
Claim 13
Dependent Claim
12 words
A process according to claim 11 wherein said inert gas is helium.
Claim 14
Dependent Claim
12 words
A process according to claim 11 wherein said aromatic compound is benzene.
Claim 15
Dependent Claim
12 words
A process according to claim 1 wherein said aromatic compound is toluene.
Claim 16
Dependent Claim
12 words
A process according to claim 11 wherein said aromatic compound is styrene.
Claim 17
Dependent Claim
12 words
A process according to claim 11 wherein said aromatic compound is aniline.
Claim 18
Dependent Claim
16 words
A process according to claim 11 wherein said coating zone is provided at substantially atmospheric pressure.
Claim 19
Dependent Claim
53 words
A process according to claim 11 wherein said a.c. signal has an amplitude from about 500 v. to 10 Kv., has a frequency of about 1.0 KHz. to 30 MHz., and is pulsed at a pulse repetition rate of about 1 to 100 KHz., and pulse duration of about 10 to 1000 microseconds.
Claim 20
Dependent Claim
21 words
A process according to claim 11 wherein said inert gas and said aromatic compound are continuously introduced into said coating zone.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |