Rockwood Specialty Group Inc., Princeton, NJ, announced that it will acquire four businesses of Dynamit Nobel, Troisdorf, Germany, to form a new specialty chemicals group with combined revenue of $2.5 billion. Affiliates of Rockwood will acquire the Sachtleben, Chemtall, CeramTec and DNES Custom Synthesis divisions of Dynamit Nobel, the chemical arm of MG Technologies AG, Frankfurt. Equity for the transaction will be provided by Rockwood’s internal resources, its existing majority shareholder K...