Patent ID: 9517211
Filing Date: 2016-12-13
CPC Classification: A61K,A61P

Claim Text:
1. An external patch, consisting essentially of: an adhesive layer laminated on a support, wherein said adhesive layer consists essentially of: 10 to 30% by weight of a styrene-isoprene-styrene block copolymer (SIS) base component; 50 to 60% by weight of a tackifier component, wherein the tackifier component comprises a rosin resin and at least one resin selected from the group consisting of petroleum resin, polyterpene resin, and a phenol resin; 10 to 30% by weight of a softening component, wherein the softening component is polybutene and liquid paraffin; 2 to 10% by weight of a fatty acid ester component, wherein the fatty acid ester component is at least one selected from the group consisting of isopropyl myristate, diisopropyl adipate and diethyl sebacate; and 1 to 8% by weight of fentanyl; wherein (1) the amount of said rosin resin is 2 to 4 times as much as the amount by weight of fentanyl, (2) the amount of said rosin resin is 0.2 to 0.4 times as much as the total amount by weight of the tackifier component, (3) the ratio by weight of liquid paraffin to polybutene is 11:10 to 2:1, and (4) the % by weight is based upon the total amount of components in the adhesive layer.