Patent ID: 7846543

Claim:
Pitch-based carbon fibers which are obtained from mesophase pitch and have an average fiber diameter (AD) of 5 to 20 μm, a percentage (CV AD value) of the degree of filament diameter distribution to average fiber diameter (AD) of 5 to 15, a number average fiber length (NAL) of 100 to 500 μm, a volume average fiber length (VAL) of 55 to 750 μm, a value obtained by dividing the volume average fiber length (VAL) by the number average fiber length (NAL) of 1.02 to 1.50 and a percentage of carbon fibers remaining on a mesh sieve having an opening size of 53 μm when classified with the sieve of 30 to 60% and a ratio of carbon fibers remaining on a mesh sieve having an opening size of 100 μm when classified with the sieve of 10 to 29%.