The present invention provides a star-shaped acrylic block polymer having a star-shaped structure in which at least three chain polymer portions radiate from a mercapto group situated at the center, wherein (meth)acrylic acid alkyl ester structural units having 7-17 carbon atoms account for 30-99.9% by mass of whole structural units of the star-shaped acrylic block polymer, and at least one of the chain polymer portions has a copolymer structure of polymerizable monomers containing a (meth)acrylic acid alkyl ester having 7-17 carbon atoms and a weakly basic monomer; and a medical patch containing an adhesive composition containing a salt of a basic drug and the star-shaped acrylic block polymer as an adhesive that exhibits high drug efficacy, that does not cause a decrease in adhesive property of an adhesive base due to an additive, and that causes less skin irritation.
                            本发明提供了一种星形
丙烯酸嵌段聚合物,其具有星形结构,其中至少三个链聚合物部分从位于中心的巯基辐射开来,其中具有 7-17 个碳原子的(甲基)
丙烯酸烷基酯结构单元占星形
丙烯酸嵌段聚合物整个结构单元质量的 30-99.9%(以质量计)的星形
丙烯酸嵌段聚合物的整体结构单元,且至少一个链聚合物部分具有包含具有 7-17 个碳原子的(甲基)
丙烯酸烷基酯和弱碱性单体的可聚合单体的共聚物结构;以及一种医用贴片,该贴片包含一种粘合剂组合物,该粘合剂组合物含有碱性药物的盐和星形
丙烯酸嵌段聚合物,作为粘合剂,该粘合剂组合物具有高药效,不会因添加剂而导致粘合剂基底的粘合性降低,且对皮肤的刺激性较小。