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

Mitsui Chemicals, Idemitsu Kosan, and Sumitomo Chemical signed an MOU to integrate Sumitomo Chemical's PP and LLDPE businesses into Prime Polymer, a joint venture between Mitsui and Idemitsu. The integration will occur in two phases, with Sumitomo Chemical acquiring a 20% stake in Prime Polymer by July 1, 2026.

- Type: Partnership
- Announced: 2026-01-08
- Where: Japan
- Status: announced
- Products: polypropylene (PP), linear low-density polyethylene (LLDPE)
- 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) (partner)

## Sources

- [adsalecprj.com](https://www.adsalecprj.com/en/news/article_details/84243.html), 2026-01-08: "Mitsui Chemicals, Idemitsu Kosan, and Sumitomo Chemical have entered into a Memorandum of Understanding regarding the integration of the polyolefin (PO) business operated by Prime Polymer... with Sumitomo Chemical’s polypropylene (PP) business and linear low-density polyethylene (LLDPE) business in "

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