Consistent with Strategy to Optimize Business Portfolio and Enhance Free Cash FlowPITTSBURGH, Dec. 5, 2024 /PRNewswire/ -- Koppers Inc., a wholly-owned subsidiary of Koppers Holdings Inc. (NYSE: KOP), today announced that the company will discontinue phthalic anhydride production at its facility in Stickney, Illinois, in 2025.The decision, affecting approximately 25 employees, was driven by significant near-term capital spending requirements that could not be economically justified by end-market projections ...