# Mitsui Chemicals, Idemitsu Kosan, Sumitomo Chemical to merge polyolefin plastics businesses

Mitsui Chemicals, Idemitsu Kosan and Sumitomo Chemical have reached a basic agreement to merge their commodity polyolefin plastics operations in Japan.

- Type: Partnership
- Announced: 2025-09-10
- Where: Keiyo Industrial Zone, Chiba prefecture, Japan
- Status: announced
- Products: commodity polyolefin plastics
- Sectors: [Specialty Chemicals](https://endata.com/sectors/specialty-chemicals.md), [Plastics and Polymers](https://endata.com/sectors/plastics-polymers.md)

## Companies

- [Idemitsu Kosan](https://endata.com/companies/19808.md) (partner)
- [Mitsui Chemicals](https://endata.com/companies/19809.md) (partner)
- [Sumitomo Chemical](https://endata.com/companies/20503.md) (partner)

## Sources

- [asia.nikkei.com](https://asia.nikkei.com/business/business-deals/japan-s-mitsui-chemicals-2-peers-to-merge-polyolefin-plastics-businesses), 2025-09-10: "Leading Japanese chemical producers Mitsui Chemicals, Idemitsu Kosan and Sumitomo Chemical have reached a basic agreement to merge their commodity polyolefin plastics operations."

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