Westlake Chemical Declares Quarterly Dividend of 18.75 cents per Share and Special Dividend of $3.75 per Share

- Both dividends payable on December 12, 2012 HOUSTON , Nov. 19, 2012 /PRNewswire/ -- The board of directors of Westlake Chemical Corporation (NYSE: WLK) declared on Friday a regular quarterly dividend of 18.75 cents per share.  The board also declared a special dividend of $3.75 per share.  Both