PPG INDUSTRIES <PPG> SELLS ETHYLENE INTERESTS PPG Industries Inc said a group of investors led by <Sterling Group> of Houston said it has agreed to acquire PPG's ethylene products business, including its inteest in an ethylene glycols joint venture with du Pont Co <DD> in Beaumont, Texas, for undisclosed terms. The company said completion is expected in the second quarter. It said the business had sales of over 50 mln dlrs in 1986.