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邻苯二甲酸醋酸纤维素(Caeeulose acetate phta-late,Ⅰ)已广泛用作为肠溶包衣材料。由于其分子中存在可离子化的邻苯二甲酸基团,至使聚合物不溶于酸性
Caeeulose acetate phta-late (I) has been widely used as an enteric coating material. Due to the presence of ionizable phthalate groups in the molecule, the polymer is not soluble in acidity