# Mitsui Chemicals, Idemitsu and Sumitomo Chemical to integrate polyolefin businesses in Japan

Mitsui Chemicals, Idemitsu Kosan, and Sumitomo Chemical signed a business integration agreement to combine their polyolefin businesses in Japan. Sumitomo Chemical's PP and LLDPE businesses will be integrated into Prime Polymer, a joint venture of Mitsui and Idemitsu.

- Type: Acquisition
- Announced: 2026-02-11
- Where: Keiyo region, Japan
- Status: announced
- Products: polypropylene, polyethylene, linear low-density polyethylene
- Sectors: [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)
- [Prime Polymer](https://endata.com/companies/31997.md) (acquirer)

## Sources

- [alpha-plast.com.ua](https://alpha-plast.com.ua/mitsui-chemicals-idemitsu-and-sumitomo-chemical-integrate-po-businesses-in-japan/), 2026-02-11: "The plan involves combining the PO business of Prime Polymer Co., Ltd., a joint venture between Mitsui Chemicals and Idemitsu Kosan with Sumitomo Chemical’s polypropylene and linear low-density polyethylene businesses."

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