# Mitsui, Idemitsu, Sumitomo agree to integrate Sumitomo PP and LLDPE into Prime Polymer

Mitsui Chemicals, Idemitsu Kosan and Sumitomo Chemical have concluded a business integration agreement to transfer Sumitomo Chemical's polypropylene and linear low-density polyethylene businesses in Japan into Prime Polymer, a joint venture of Mitsui and Idemitsu. Sumitomo Chemical will receive a 20% stake in Prime Polymer.

- Type: Acquisition
- Announced: 2025-12-24
- Where: Japan, Japan
- Status: announced
- Products: polypropylene, linear low-density polyethylene
- Sectors: [Plastics and Polymers](https://endata.com/sectors/plastics-polymers.md)

## Companies

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

## Sources

- [rttnews.com](https://www.rttnews.com/3606228/mitsui-idemitsu-sumitomo-enter-agreement-for-integration-of-sumitomo-pp-lldpe-into-prime-polymer.aspx), 2025-12-24: "The companies now hereby announce that, after thorough review, they have concluded a business integration agreement and a joint venture agreement regarding the Business Integration."

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