Hollow filamentary structures
OwnerYoshio Tamura, Koichiro Ohtomoinventors
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Abstract
A process for producing a hollow carbon or ion-exchange filament which comprises treating a filament consisting of a fiber-forming polymer of predominantly an uncured novolak resin composition with a curing reagent in the presence of a curing catalyst to effect the cure of the filament extending from the peripheral portion to the axial portion thereof to a depth of 20-90% of the cross-sectional area of the filament, removing the uncured core portion of the filament by extraction with a solvent, and then subjecting the resulting hollow novolak resin filament to a carbonization treatment or introducing an ion-exchangeable group into the resulting hollow novolak resin filament; and products produced by this process.
Claims7
A hollow carbon filament having adsorption activity, characterized in that said filament consists essentially of carbon;
- the hollow structure of the filament continuously extends in the axial direction of the filament;
- said filament has a degree of hollowness of 10 - 80%;
- and the surface area of said filament is at least 400 square meters per gram.
Dependencies are inferred from the claim text.