$Westlake Chemical (WLK)$ 8-K - Current report Filed: 2017-05-19 AccNo: 0001193125-17-176637 Size: 86 KBItem 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain OfficersItem 5.03: Amendments to Articles of Incor 网页链接