Sumitomo Chemical moves ahead with major plastics business shake-up
By: ICN Bureau
Last updated : April 02, 2026 10:23 am
The move follows a previously disclosed agreement involving Mitsui Chemicals and Idemitsu Kosan Co, signalling a coordinated push among Japan’s chemical heavyweights to streamline operations and strengthen competitiveness in a challenging global market
Sumitomo Chemical has taken a decisive step in reshaping Japan’s petrochemical landscape, announcing it has formally signed a key agreement to transfer a major portion of its plastics business as part of a broader industry consolidation.
The company confirmed it has entered into an absorption-type company split agreement with Prime Polymer Co, advancing the first phase of a two-stage plan to integrate its polyolefin operations — specifically polypropylene (PP) and linear low-density polyethylene (LLDPE).
The move follows a previously disclosed agreement involving Mitsui Chemicals and Idemitsu Kosan Co, signalling a coordinated push among Japan’s chemical heavyweights to streamline operations and strengthen competitiveness in a challenging global market.
Under the plan, Sumitomo Chemical will transfer its PP and LLDPE businesses in Japan to Prime Polymer, a joint venture between Mitsui Chemicals and Idemitsu Kosan. In return, Sumitomo Chemical will secure a 20% stake in Prime Polymer, cementing its position in the newly integrated entity.
The agreement signed today marks the launch of “Absorption-Type Company Split Phase One,” with completion targeted for July 1, 2026. A second phase is scheduled to follow, with final integration expected by April 2027.
Despite the strategic significance of the deal, the company emphasized that the financial impact will be limited in the near term. Each phase of the split is projected to reduce total assets by less than 10% and net sales by less than 3%, minimizing disruption to overall performance.
The integration remains subject to regulatory approvals and competition law clearances, meaning timelines could shift depending on the outcome of those reviews.
The restructuring builds on agreements first announced on December 24, 2025, as the four companies move to consolidate overlapping operations and respond to mounting pressures in the global petrochemicals sector.
Sumitomo Chemical expects to report sales revenue of 2.3 trillion yen for the fiscal year ending March 2026, alongside a projected core operating income of 200 billion yen, underscoring a stable outlook even as it undertakes one of its most significant structural changes in recent years.