KINGSPORT — Eastman Chemical Co. announced Wednesday that it has entered into a definitive agreement to acquire Industrias del Acetato de Celulosa S.A. (INACSA), a Spanish producer of cellulosic yarn. The INACSA yarn business and assets are expected to support continued growth of Naia cellulosic yarn for the apparel market and will become part of the global Fibers segment supply base. “With the acquisition of INACSA, Eastman gains a well-respected yarn producer and a European site that will enhance our ability to support the global textiles supply chain,” said Brad Lich, executive vice president and chief commercial officer.