The newly constituted board of directors for Columbian Chemicals is chaired by Kumar Mangalam Birla , the Aditya Birla Group chairman , while other directors include RajashreeBirla ,Rajiv Dube, SantruptMisra , D D Rathi and Kevin Boyle , CEO, Columbian Chemicals . "We viewthecarbon black business as a significant globalbusinessin our portfolio .There is a lot to be derived from this coming together of the two entities ," Kumar Mangalam Birls said .