Idemitsu Kosan Co., Ltd. is a Japanese integrated energy and chemical company and one of the country’s largest oil refiners and fuel marketers. Headquartered in Tokyo, it operates refining, petrochemical, and lubricant manufacturing assets in Japan and supports an international sales and supply network serving industrial and consumer markets.
The company’s chemical portfolio spans basic chemicals (such as olefins, aromatics, and solvents), downstream polymers and performance materials, electronic materials including OLED components, and a global lubricants and base-oils business. Idemitsu supplies key feedstocks for plastics and synthetic fibers, as well as asphalt and specialty chemicals used in automotive, electronics, and packaging applications. The company also pursues initiatives in recycling, bio-based materials, and lower-carbon energy solutions alongside efficiency and emissions-reduction projects in refining and petrochemicals.
Also known as Idemitsu.
Supply chain uses renewable naphtha from waste and residues to make drop‑in renewable nylon fiber for outdoor apparel, targeting product use in August 2026.
MOU (Sept 2025) and definitive agreement (Dec 2025) formalize PP/LLDPE business integration; overseas antitrust reviews are ongoing and the deal will close after their clearance.
Japan completes its first ship-to-ship methanol bunkering at Yokohama, using domestically produced biomethanol, marking a key step in promoting methanol as a marine fuel.
Fourteen companies collaborate to create a supply chain for renewable plastics, enhancing Sony's product sustainability and tracking GHG emissions to reduce carbon footprint.
The integration aims to enhance competitiveness, optimize production, and achieve cost savings, while focusing on sustainable, high-performance products in Japan's shrinking PO market.
The companies will consolidate ethylene production at Mitsui's site by July 2027 to enhance competitiveness amid declining domestic demand and increased global competition.
The integration aims to boost domestic polyolefin competitiveness, optimize production, and achieve cost savings, pending regulatory approvals.
