- A. Schulman Inc.
- AdvanSix Inc.
- Arkema Group
- Asahi Kasei Corporation
- BASF SE
- Celanese Corporation
- Chi Mei Corporation
- Covestro AG
- Daicel Corporation
- DuPont de Nemours Inc.
- Dyneon LLC (3M Company)
- Eastman Chemical Company
- Evonik Industries AG
- Grand Pacific Petrochemical Corporation
- INEOS Styrolution Group GmbH (INEOS)
- LANXESS
- LG Chem
- Mitsubishi Engineering-Plastics Corporation
- Polyone
- Polyplastics Co. Ltd
- Rochling Group
- Royal DSM
- SABIC
- Solvay
- Trinseo
- TEIJIN Limited