Mitsui Chemicals Inc. (TYO:4183) is set to increase its prices for Mitsui EPT, the company’s brand of ethylene propylene diene monomer (EPDM). The change will apply to all Mitsui EPT products supplied from Dec. 1 onward, with prices rising by at least 40 yen ($0.35) per kilogram. Explaining the decision, Mitsui Chemicals started by noting that market conditions for EPDM…