# Sumitomo Chemical to transfer PP and LLDPE businesses to Prime Polymer, acquire 20% stake

Sumitomo Chemical will transfer its domestic polypropylene and LLDPE businesses to Prime Polymer via two-stage absorption-type demerger, and acquire a 20% stake in Prime Polymer, with effective dates in July 2026 and April 2027.

- Type: Acquisition
- Announced: 2025-12-24
- Where: Japan
- Status: announced
- Capacity: 1.59 MMt/y PP, 720,000 t/y PE
- Products: polypropylene (PP), linear low-density polyethylene (LLDPE)
- Sectors: [Plastics and Polymers](https://endata.com/sectors/plastics-polymers.md)

## Companies

- [Sumitomo Chemical](https://endata.com/companies/20503.md)
- [Idemitsu Kosan](https://endata.com/companies/19808.md) (investor)
- [Idemitsu Kosan](https://endata.com/companies/19808.md) (partner)
- [Mitsui Chemicals](https://endata.com/companies/19809.md) (investor)
- [Mitsui Chemicals](https://endata.com/companies/19809.md) (partner)
- [Sumitomo Chemical](https://endata.com/companies/20503.md) (acquirer)
- [Prime Polymer](https://endata.com/companies/31997.md) (target)

## Sources

- [japanir.jp](https://japanir.jp/company/company-4005/ir/4005-20251224-01_wp_corporate_restructuring/), 2025-12-24: "住友化学は国内ポリオレフィン事業のPP及びLLDPE事業をプライムポリマーに二段階の簡易吸収分割で承継し、同社株式20％を取得。"
- [chemweek.mydigitalpublication.com](https://chemweek.mydigitalpublication.com/articles/prime-polymer-sumitomo-chemical-finalize-polyolefin-jv), 2026-01-23: "The integration aims to optimize polyolefin production, targeting annual cost savings exceeding ¥8 billion."

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Data from Endata (https://endata.com/). Announcements are summarized from public sources and may be incomplete; check the linked originals.