Patent ID: 7438970

Claim:
A carbon fiber composite material, comprising: a thermoplastic resin; carbon nanofibers dispersed in the thermoplastic resin; and dispersing particles which promote dispersion of the carbon nanofibers in the thermoplastic resin: wherein: the carbon fiber composite material has a first-component spin-spin relaxation time (T 2 s ) of from 100 to 1,000 μsec. as measured at 250° C.; the carbon fiber composite lacks or has a second-component spin-spin relaxation time (T 2 l ); the fraction of components having the second-component spin-spin relaxation time is less than 0.2, as measured at 250° C. by Hahn-echo method using a pulsed NMR technique with 1 H as an observing nucleus; and if the carbon fiber composite has a second-component spin-spin relaxation time (T 2 l ), (T 2 l ) is less than 20,000 μsec.