Application and preparation of hypromellose phthalate_Kain Industrial Additive

background and overview[1] as an enteric polymer, hypromellose phthalate is widely known. it is a polymer with a total of three substituents, and is made by using methyl (-ch3) and hydroxypropyl groups. it is produced by replacing the hydrogen atoms of the hydroxyl groups on the cellulose skeleton with two substituents (-c3h6oh) to obtain an…