Then, nanoclay was added to an aqueous HPMC solution to obtain the HPMC þ Clay solution. The last formula involved first preparing the HPMC þ Beeswax solution and then nanoclay was added to obtain the HPMC þ Beeswax þ Clay solution. All mixture solutions were homogenized using a homogenizer (Polytron model PT 3100, Littau, Switzerland) at 20,000 rpm for 5 min. The solutions were degassed prior to forming film.