HPMCAS is an enteric material that can be used as enteric coating material, microcapsule capsule membrane material, and sustained-release material, such as the preparation of sustained-release granules, tablets, capsules, and even microcapsules, and when used as sustained-controlled release agent, the release rate is pH-dependent.
Advantages: Compared with other enteric materials, HPMCAS has more stable storage conditions, dissolves faster in the intestine, and is not easy to react with the coating materials.