Private equity Bain Capital has bought a 15.4% stake in Kolkata-based Himadri Chemicals in a move which will support the chemical company’s plan to triple capacity. The Rs 600-crore deal that includes an open offer to Himadri’s retail shareholders, will part-finance the company’s Rs 1,600-crore expansion plan that will raise its coal tar capacity to 400,000 tonne and forward integrate into other products for use in construction and auto industries, CEO Anurag Choudhary told ET. Coal tar is a high viscous liquid by-product derived from coal gas, and is widely used by the auto sector, specially by electric cars that are powered by lithium ion batteries. […]