Alpek SAB DE CV; Ashland Inc; Ineos Group AG; Nova Chemicals Corporation; Bayer Material science; Chevron Phillips Chemical Company LLC; ENI S.p.A.; INEOS Styrolution Holding Ltd.; Saudi Basic Industries Corp. (SABIC); Total S.A.; The Dow Chemical Company; Styron LIC; Styrolution Group GmbH; Royal DSM,; DowDuPont; Covestro; Trinseo; DSM.