Carbon fiber bundle and method of producing carbon fiber bundle
AssigneeMitsubishi Chemical Corporation
InventorsTakayuki Kiriyama, Naoki Sugiura, Masahiro Hata
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Abstract
Provided are carbon fiber bundles which have high knot strength even if the single fiber fineness is large, and which have excellent handling properties and processability. The carbon fiber bundles have a single fiber fineness of 0.8-2.5 dtex, knot strength of 298 N/mm2 or greater. This method of producing carbon fibers having knot strength of 298 N/mm2 or greater involves a heat treatment step for heat treating, for 50-150 minutes, specific polyacrylonitrile-based precursor fiber bundles described in the description in an oxidizing atmosphere rising in temperature in the temperature range of 220-300° C.
Claims21
1-9. (canceled)
A carbon fiber bundle having a single fiber fineness of at least 0.8 dtex to no more than 2.5 dtex, a single fiber roundness of at least 0.70 to no more than 0.99, and a knot strength of at least 298 N/mm2.
A carbon fiber bundle having a single fiber fineness of at least 0.8 dtex to no more than 2.5 dtex, a strand modulus of elasticity of at least 232 GPa, and a knot strength of at least 298 N/mm2.
A carbon fiber bundle having a single fiber fineness of at least 0.8 dtex to no more than 2.5 dtex, a strand strength of at least 3.9 GPa, and a knot strength of at least 298 N/mm2.
Dependencies are inferred from the claim text.