Keywords: Poly(ethylene-co-vinyl acetate) syn. Ethylene/vinyl acetate copolymer (CAS No. 24937-78-8); Phenylpropanolamine hydrochloride (CAS Number: 700-65-2)Hot-melt extrusion; Poly(ethylene-co-vinyl acetate); Phenylpropanolamine hydrochloride; Controlled release;