South Korea-based DL Chemical Co. Ltd. on March 15 completed its $2.5 billion acquisition of Houston-based Kraton Corp. under a definitive merger agreement that was announced last September. Kraton produces styrenic block copolymers and pine chemicals, including some used in lubricants production.  As part of a planned leadership transition, Garry Ridge will retire as CEO of San Diego, California-based WD-40 Co. on Aug. 31. Steve Brass, who has served as the company’s president and chief operating officer since 2019, was appointed to become Ridge’s successor, effective Sept. 1.