Compass Group International has acquired SDC Technologies Inc, a global supplier of functional surface technologies, coatings and materials, for an undisclosed sum. No changes to SDC's senior management team are planned as part of the acquisition. The Compass Group, a private investment firm based like SDC in California, was attracted to the company's technology, especially its proprietary high-performance coating systems for plastic and glass materials. The coatings, known for their optical clarity and abrasion resistance, are used in vision applications with end uses in the ophthalmic, sunglass and safety eyewear segments. Compass, which usually makes investments of $10 million to $25 million, concentrates on buying companies in the service, distribution and manufacturing sectors, primarily in North America.