Patent ID: 9375422
Filing Date: 2016-06-28
CPC Classification: A61K,A61P

Claim Text:
1. A fentanyl-containing patch for external use prepared by adding fentanyl as an active ingredient to the adhesive layer consisting of 5 to 50% by weight per total amount of the adhesive layer of a styrene-isoprene-styrene block copolymer, 30 to 60% by weight per total amount of the adhesive layer of a tackifier resin consisting of a rosin resin and a terpene resin and 5 to 40% by weight per total amount of the adhesive layer of a softener consisting of polybutene and liquid paraffin, wherein the rosin resin and the terpene resin are present in a ratio within the range of 4:1 to 1:1.