Patent ID: 7914708

Claim:
A conductive masterbatch, consisting essentially of: a conductive filler selected from carbon blacks having n-dibutyl phthalate oil absorption in the range of 150 ml/100 g to 600 ml/100 g and carbon nanotubes, a polyamide resin, and a copolymer which contains at least a vinyl monomer having a functional group reactive with the polyamide resin and a styrene as monomer units, wherein the copolymer is a graft copolymer in which a polymer side-chain, which has at least a monomer unit selected from styrenes and meta-acrylates, is bonded to a polymer main-chain, which has at least a vinyl monomer having a functional group reactive with the polyamide resin and a styrene as monomer units, and wherein the content of the conductive filler is in the range of 10% by mass to 40% by mass of the conductive masterbatch.