Degussa announced that Jack Clem has been named vice president, carbon black for the NAFTA region. In this role, Mr. Clem is responsible for business performance and strategic growth for Degussa’s North American carbon black business, covering all North American operations, sales and distribution of Degussa’s rubber and pigment carbon black products.      Mr. Clem joins the advanced fillers and pigments business unit of Degussa with more than 25 years of experience in the chemical industry. P...