Percutaneous absorption type plaster

摘要

A transdermal patch comprising a backing 2 and an adhesive layer 3 laminated on the backing 2 , wherein the adhesive layer 3 comprises a rosin-based resin and petroleum resin as a tackifier, the total compounding amount of the rosin-based resin and the petroleum resin is in a range of 15% by mass to 50% by mass, and compounding amount of the petroleum resin is 1/3 times by mass to 4 times by mass as that of the rosin-based resin.