Theratech Inc., a Salt Lake-based company specializing in scientifically designed drug delivery systems, has signed a cooperative research agreement with Solvay and Cie, Brussels, Belgium.

Solvay will investigate several possible applications of Theratech's expertise and technology. It also has acquired a minority interest in the capital of Theratech.Solvay operates in alkalis, peroxides, plastics, processing and health and its pharmaceutical operations in the United States.