▎ 摘　　要

NOVELTY - Injection molding composition comprises a composite resin comprising medium-density polyethylene and high-density polyethylene, peroxide crosslinking agent and carbon-based filler. USE - The composition is useful for buoys (claimed). ADVANTAGE - The injection molding composition has excellent durability, impact resistance and productivity; and provides environmentally friendly buoy. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) buoy formed by molding the injection molding composition; and (2) producing buoy, comprising (a) mixing a composite resin comprising medium-density polyethylene and high-density polyethylene, a peroxide crosslinking agent, and a carbon-based filler to form an injection molding composition, and (b) obtaining a buoy by injection molding the injection molding composition into an injection mold.