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AssigneeNippon Oil Co., Ltd.
InventorsHiroaki Takashima, Osamu Kato, Tsutomu Kihara
Estimating the term…
Pitch-based carbon fibers superior in compression characteristics are obtained by mixing a polycyclic aromatic compound and a hydrogen donating compound at a mole ratio of the latter to the former in the range of 0.1 to 10, polymerizing the resulting mixture at a temperature of 50.degree. to 400.degree. C. in the presence of a Lewis acid as catalyst, then removing the catalyst, thereafter heat-treating the resulting polymer to obtain a pitch containing 5-40% of anisotropic spheres of 5-60 .mu.m, having a total amount of aliphatic hydrogen of 25-50% and an amount of aliphatic hydrogen after .beta. of 5-25% and containing not more than 30% of oriented carbon based on a total amount of aromatic carbon, then spinning said pitch, then making the resulting pitch fiber infusible and subjecting the pitch fiber thus rendered infusible to a carbonization treatment.
A process for producing a carbon fiber, which process comprising mixing a polycyclic aromatic compound and a hydrogen donating compound at a mole ratio of the latter to the former in the range of 0.1 and 10, polymerizing the resulting mixture at a temperature of 50.degree. to 400.degree. C. in the presence of a Lewis acid as catalyst, then removing the catalyst, thereafter heat-treating the resulting polymer to obtain a pitch containing 5-40% of anisotropic spheres of 5-60 .mu.m, having a total amount of aliphatic hydrogen of 25-50% and an amount of aliphatic hydrogen bonded to aliphatic carbons spaced two or more carbon atoms from aromatic rings of 5-25% and containing not more than 30% of oriented carbon based on the total amount of aromatic carbon, then spinning said pitch, then making the resulting pitch fiber infusible and subjecting the pitch fiber thus rendered infusible to a carbonization treatment.
Dependencies are inferred from the claim text.