▎ 摘　　要

NOVELTY - A polyolefin-based composite material composition comprises a polyolefin resin, and a particulate carbon nanostructure in which shell layers comprising a graphene layer or a fullerene layer are stacked. USE - Polyolefin-based composite material composition used for forming exterior materials for structures e.g. buildings, fibers, impact reinforcing materials, electromagnetic wave shielding materials, and heat dissipating materials (all claimed). ADVANTAGE - The composition has excellent electrical conductivity, thermal conductivity and improved mechanical properties such as tensile strength and elastic modulus. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of polyolefin-based composite material composition, which involves mixing and extruding the polyolefin resin and the particulate carbon nanostructure.