Dynacast, Charlotte, N.C., has been sold by holding company Melrose PLC, London, to a newly incorporated company, KDI Holdings Inc., managed by private investment firm Kenner & Company Inc., New York. The deal, which is expected to close in August 2011, comes 18 months after the global diecasting firm closed its Montreal, Candada, plant. According to a Melrose executive, Dynacast has performed well in the…