Showa Denko KK (TYO:4004) announced on Aug. 20 that it intends to increase the selling price of its chloroprene rubber by 42 yen ($0.38) per kilogram, starting with shipments made on Sept. 10. Explaining the price hike, Showa Denko said that the business environment around its chloroprene rubber business has rapidly worsened of late. The company pointed here to tight…