Westlake Chemical Sends Letter Urging Axiall Shareholders to Vote "FOR" its Nine Highly-Qualified and Independent Nominees to Axiall's Board

-Mails Definitive Proxy Statement in Connection with 2016 Axiall Corporation Annual Meeting HOUSTON , May 4, 2016 /PRNewswire/ --  Westlake Chemical Corporation (NYSE: WLK) today sent the following letter to Axiall Corporation's (NYSE: AXLL) shareholders urging them to vote the GOLD proxy card