Patent ID: 8253318

Claim:
A substrate having a thin film obtained by: mixing carbon nanofibers into an elastomer including an unsaturated bond or a group having affinity to the carbon nanofibers, and dispersing the carbon nanofibers by applying a shear force to obtain a carbon fiber composite material; mixing the carbon fiber composite material and a solvent to obtain a coating liquid; and applying the coating liquid to a substrate to form the thin film, the thin film in an uncrosslinked form having a first spin-spin relaxation time (T 2 n ) measured at 110° C. of 100 to 3,000 μsec, a second spin-spin relaxation time (T 2 nn ) measured at 110° C. of either 0 μsec or 1,000 to 10,000 μsec, a fraction (fn) of components having the first spin-spin relaxation time of 0.95 or more.