Responding to increased global demand, Mitsui Chemicals Inc. (TYO:4183) will increase annual production capacity of its Milastomer thermoplastic elastomer by 5,000 tons. The company will invest almost 1 billion yen ($10 million) in expanding production facilities of its wholly-owned subsidiary Sun Alloys Co. Ltd., adding one production line of 5,000 annual tons. Construction will start in February 2017 and is planned…