Process for production of carbon fiber
AssigneeSumitomo Chemical Company, Limited
InventorsShozo Horikiri, Jiro Iseki, Masao Minobe
Life of this patent
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Abstract
A process for the production of carbon fiber, which comprises sulfonating polyethylene fiber with chlorosulfonic acid, sulfuric acid, fuming sulfuric acid or a mixture of two or more kinds thereof and carbonizing the resulting precursor fiber by heating at a temperature of 600.degree. to 3,000.degree. C, optionally while giving a tension to the fiber.
Claims20
A process for producing carbon fiber, which comprises sulfonating fiber consisting of polyethylene or a copolymer of ethylene containing 90 or more % by weight of ethylene units with a sulfonating agent selected from the group consisting of chlorosulfonic acid, sulfuric acid, fuming sulfuric acid and mixtures thereof and then carbonizing the resultant sulfonated product by heating at a temperature of from 600.degree. to 2,000.degree. C. in an atmosphere of an inert gas or in a vacuum.
A process for producing graphite fiber, which comprises sulfonating fiber consisting of polyethylene or a copolymer of ethylene containing 90 or more % by weight of ethylene units with a sulfonating agent selected from the group consisting of chlorosulfonic acid, sulfuric acid, fuming sulfuric acid and mixtures thereof and then carbonizing the resultant sulfonated product by heating at a temperature of from 2,000.degree. to 3,000.degree. C. in an atmosphere of an inert gas or in a vacuum.
A carbon fiber, which is produced by sulfonating fiber consisting of polyethylene with a member selected from the group consisting of chlorosulfonic acid, sulfuric acid and fuming sulfuric acid and then carbonizing the resultant sulfonated product by heating at a temperature of from 600.degree. to 2,000.degree. C. in an atmosphere of an inert gas or in a vacuum.
A graphite fiber, which is prooduced by sulfonating fiber consisting of polyethylene with a member selected from the group consisting of chlorosulfonic acid, sulfuric acid and fuming sulfuric acid and then carbonizing the resultant sulfonated product by heating at a temperature of from 2,000.degree. to 3,000.degree. C. in an atmosphere of an inert gas or in a vacuum.
Dependencies are inferred from the claim text.