- Asahi Kasei Corporation
- Celanese Corporation
- Deutsche Beteiligungs AG
- Daicel Polymer Ltd.
- Dieffenbacher GmbH
- Hanwha Azdel
- LANXESS
- PlastiComp Inc.
- PolyOne Corporation
- PPG Industries Inc.
- the Quadrant group of companies
- RTP Company
- SABIC
- SBHPP
- SGL CARBON SE
- Solvay
- Sumitomo Chemical Co. Ltd
- TechnoCompound GmbH (Polymer Group)