US4259307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing carbon fibers
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1980-01-25
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Granted: 1981-03-31
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Expires: 2000-01-25
Abstract
Abstract The present invention relates to a process for producing carbin fibers which involves thermally stabilizing and carbonizing or graphitizing acrylic fibers containing 0.1-5 weight %, based on the weight of the fibers, of a straight chain silicone substance and further containing 0.1-5 weight %, based on the weight of the fibers, of a chemical substance which is selected from glycerine, polyethylene glycol, polypropylene glycol, alkyl derivatives thereof, and mixtures or compounds of two or more of these substances, and which generates only a residue less than 5 weight % under the action of heat at 240 DEG C. for one hour. According to applicant's invention, such problems as fluffiness, spreading, filament breakage etc. can be greatly reduced and it is possible to produce fibers free from agglutination or fusion and having high strength and high modulus of elasticity by heat-treatment in a short time.
Inventors
- 👤 Kunio Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:56
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
An improved process for producing carbon fibers characterized by thermally stabilizing and carbonizing or graphitizing acrylic fibers containing 0.1-5 weight %, based on the weight of the fibers, of a straight chain silicone substance and further containing 0.1-5 weight %, based on the weight of the fibers, of a chemical substance which is selected from glycerine, polyethylene glycol, polypropylene glycol, alkyl derivatives thereof, and mixtures or compounds of two or more of these substances, and which generates only a residue less than 5 weight % under the action of heat at 240° C. for one hour.
Claim 2
Dependent Claim
96 words
An improved process for producing carbon fibers characterized by thermally stabilizing and carbonizing or graphitizing acrylic fibers containing 0.1-5 weight %, based on the weight of the fibers, of a straight chain silicone substance and further containing 0.1-5 weight %, based on the weight of the fibers, of a chemical substance which is selected from glycerine, polyethylene glycol, polypropylene glycol, alkyl derivatives thereof, and mixtures or compounds of two or more of these substances, and which generates only a residue less than 5 weight % under the action of heat at 240° C. for one hour.
Claim 3
Dependent Claim
140 words
A process as claimed in claim 1 wherein the straight chain silicone substance is represented by the formula: ##STR3## wherein each of R 1 , R 2 and R 3 represents hydrogen, methyl, ethyl or phenyl, R 4 stands for --C n H 2n -- (n is an integer from 1 to 10) or phenylene, each of R 5 R 6 represents hydrogen or --C n H 2n+1 (n is an integer from 1 to 5), each of X and Y is an integer from 1 to 100,000 (X+Y>10), and A represents hydrogen, --C 2 H 4 O) m H, --C 3 H 6 O) n H (each of m and n is an integer from 1 to 10), ##STR4## wherein each of R 7 and R 8 is hydrogen, phenyl or alkyl having not more than 10 carbon atoms.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1 wherein the alkyl derivative is selected from the group consisting of ether compounds with alcohols.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 3 wherein the alcohols are selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, pentanol, and hexanol.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1 wherein the alkyl derivative is selected from the group consisting of ester compounds with lower carboxylic acids or oxycarboxylic acids.
Claim 7
Dependent Claim
35 words
A process as claimed in claim 5 wherein the carboxylic acids are selected from the group consisting of formic acid, acetic acid, oxalic acid, malonic acid, succinic acid, butyric acid, lactic acid, and malic acid.
Claim 8
Dependent Claim
27 words
A process as claimed in claim 1 wherein the acrylic fibers are those of acrylonitrile homopolymers or copolymers which contain at least 85% by weight of acrylonitrile.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 1 wherein said silicone substance and/or said chemical substance is introduced in the acrylic fibers before or after the formation of the fibers.
Claim 10
Dependent Claim
34 words
A process as claimed in claim 8 wherein said silicone substance and/or chemical substance is used in the form of an aqueous dispersion or organic solvent solution for the introduction into the acrylic fibers.
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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |