US2018051397A1PendingUtilityA1

Method for producing carbon fibers

Assignee: KOBE STEEL LTDPriority: Mar 17, 2015Filed: Feb 8, 2016Published: Feb 22, 2018

Est. expiryMar 17, 2035(~8.7 yrs left)· nominal 20-yr term from priority

Inventors:Maki Hamaguchi Shohei Wada Toshinori Inoue Seongho Yoon Jin Miyawaki

D01F 9/15D01D 10/02C10G 1/04D01D 5/08

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Abstract

A method for producing a carbon fiber includes a separation step of separating an ash-free coal obtained from a bituminous coal or a sub-bituminous coal, into a soluble component(s) and an insoluble component(s) by a solvent extraction treatment, a heat treatment step of heat-treating the soluble component(s), a melt spinning step of melt-spinning the soluble component(s) subjected to the heat treatment, an infusibilization step of infusibilizing a filament body obtained by the melt spinning, and a carbonization step of carbonizing the filament body subjected to the infusibilization.

Claims

exact text as granted — not AI-modified

1 : A method for producing a carbon fiber, comprising:
 separating an ash-free coal obtained from a bituminous coal or a sub-bituminous coal, into a soluble component(s) and an insoluble component(s) by a solvent extraction treatment;   heat-treating the soluble component(s);   melt-spinning the soluble component(s) subjected to the heat treatment;   infusibilizing a filament body obtained by the melt spinning; and   carbonizing the filament body subjected to the infusibilization.   
     
     
         2 : The method for producing a carbon fiber according to  claim 1 , wherein in the separating, a solvent extraction temperature is lower than 300° C. 
     
     
         3 : The method for producing a carbon fiber according to  claim 1 , wherein in the heat-treating, a heat treatment temperature is 150° C. or higher. 
     
     
         4 : The method for producing a carbon fiber according to  claim 1 , wherein a heat treatment temperature in the heat-treating is higher than a solvent extraction temperature in the separating. 
     
     
         5 : The method for producing a carbon fiber according to  claim 1 , wherein a heat treatment temperature in the heat-treating is higher than a spinning temperature in the melt spinning. 
     
     
         6 : The method for producing a carbon fiber according to  claim 2 , wherein in the heat treating, a heat treatment temperature is 150° C. or higher.

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