US3723609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of carbon fibers
Assignee: Bayer AG
•
Filing: 1970-10-07
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Granted: 1973-03-27
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Expires: 1990-10-07
Abstract
Abstract In the production of carbon fibers wherein a carbon-containing fiber-forming material is spun as a solution, the spun-filaments are converted to solid fibrous material, and the fibrous material is carbonized, the improvement which comprises including in said solution at least one fiber-forming high polymer at a concentration of about 0.001 to 10 percent by weight and a greater amount of a carbon source comprising at least one carboncontaining organic material having a softening or melting point in excess of about 80* C., whereby the solution of said carbon containing material is rendered spinnable by addition of said fiber-forming high polymer, said carbon containing organic material serving as the source of carbon for the carbon fiber; the fiber may thereafter be graphitized. The spinning solution used for fiber production is preferably a solution in a volatile solvent so that it may be dry spun. The carbon source in said solvent by itself would not be spinnable and may be a monomer or low polymer.
Inventors
- 👤 M Mansmann
- 👤 G Winter
- 👤 G Pampus
- 👤 N Schon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:49
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/18; D01F9/16; D01F9/17; D01F9/20; D01F9/21; D01F9/24; D01F9/245; D01F9/26; D01F9/28; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
16 words
Process according to claim 1, wherein the solution has a spinnability of at least 100 cm.
Claim 2
Dependent Claim
16 words
Process according to claim 1, wherein the solution has a spinnability of at least 200 cm.
Claim 3
Dependent Claim
12 words
Process according to claim 1, wherein the carbonized fiber is thereafter graphitized.
Claim 4
Dependent Claim
53 words
Process according to claim 1, wherein, said carbon source is a material leaving a carbon residue after carbonization which is at least about 10 percent by weight of the original material and, when dissolved alone in said solvent to a concentration of 10 percent, has a spinnability of less than about 10 cm.
Claim 5
Dependent Claim
21 words
Process according to claim 5, wherein said solvent is volatile and said solution is converted to fibrous material by dry spinning.
Claim 6
Dependent Claim
20 words
Process according to claim 1, wherein said solution comprises an aqueous solution of said fiber-forming material and said carbon source.
Claim 7
Dependent Claim
22 words
Process according to claim 7, wherein said carbon source is at least one of lignin, derivatives of lignin, carbohydrate derivatives and proteins.
Claim 8
Dependent Claim
27 words
Process according to claim 8, wherein the derivatives of lignin are lignin sulfonic acid and alkali metal, alkaline earth metal, and ammonium salts of lignin sulfonic acid.
Claim 9
Dependent Claim
24 words
Process according to claim 1, wherein said carbon source comprises a monomer or a polymer having a degree of polymerization less than about 50.
Claim 10
Dependent Claim
30 words
Process according to claim 1, wherein said carbon source is selected from vinyl polymers, polyethers, polyesters, polyanhydrides, polyurethanes, polyureas, polyamides, phenol formaldehyde resins, polyolefins, and mixtures, derivatives or copolymers thereof.
Claim 11
Dependent Claim
28 words
Process according to claim 11, wherein after conversion of the solution into fibrous material, the fibrous material is treated to render said carbon source infusible during subsequent carbonization.
Claim 12
Dependent Claim
24 words
Process according to claim 1, wherein said solution contains said fiber-forming high polymer in a concentration of about 0.01 to 5 percent by weight.
Claim 13
Dependent Claim
50 words
Process according to claim 13, wherein said fiber-forming high polymer is at least one of polystyrene, polyisobutylene, polymethylmethacrylate, polyisoprene, vinyl polymers and copolymers, diolefin polymers, polydienes, polyethylene oxide, substituted polyethers and thioethers, polyesters, polyamides, polypeptides, polysaccharides, polysiloxanes, and polyacrylamide or acrylic acid/acrylamide copolymers or their alkali metal or ammonium salts.
Claim 14
Dependent Claim
58 words
Process according to claim 8, wherein said fiber-forming high polymer is selected from polyethylene oxide, polyacrylamide, and acrylic acid/acrylamide copolymers or their alkali metal ammonium salts or substituted ammonium salts having an inherent viscosity (ln eta r)/c above 4 (determined at a shearing stress Tau 0.98 dyn/cm2, 25* C., pH 7, 0.05 percent solution with 0.1 percent NaCl).
Claim 15
Dependent Claim
75 words
Process according to claim 12, wherein said fiber-forming high polymer is at least one of polystyrene, polyisobutylene, polymethylmethacrylate, polyisoprene, vinyl polymers and copolymers, diolefin polymers, polydienes, polyethylene oxide, substituted polyethers and thioethers, polyesters, polyamides, polypeptides, polysaccharides, polysiloxanes, polyacrylamide, and acrylic acid/acrylamide copolymers or their alkali metal, ammonium, and substituted ammonium salts present in the solution in a concentration of about 0.01 to 5 percent and the solution is formed into fibrous material by dry spinning.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |