Sartomer Company, in an effort to further establish its position as a global supplier of specialty chemicals, promoted two of its managers to positions that are dedicated to expanding the company’s business in Asia. David Long has been named senior vice president of finance, Asia, and Bo Yang has been named general manager of China.      In his new role, Mr. Long is responsible for all financial matters and business development activities in Asia.      Mr. Yang, who was previously Sartomer...