Patent ID: 7223418
Filing Date: 2007-05-29
Classification: A61K

Abstract:
1. A stretch plaster comprising a support membrane having a thickness of 3 to 30 μm and a drug containing adhesive layer on one side thereof, said adhesive layer having a thickness of 3 to 400 μm, wherein (i) the support membrane comprises a copolymer consisting essentially of 50 to 85% by weight of vinyl acetate, 10 to 40% by weight of a (meth)acrylate alkyl ester, wherein the alkyl group has 3 to 14 carbon atoms and 1 to 10% by weight of (meth)acrylic acid, (ii) the copolymer is cross-linked by a polyvalent metal selected from the group consisting of aluminum and a poly-functional chain compound, wherein the cross-linking ratio is 20% or more of the total molar number of carboxyl group of the copolymer when the polymer is cross-linked by aluminum, and is 1 to 10% expressed by copolymerized ratio of the poly-functional chain compound when the copolymer is cross-linked by a poly-functional chain compound, (iii) the support membrane has a self adhesion strength of 150 g or less and (iv) the support membrane has 70% or more of an elasticity recovery when it stretches 10% of itself and, (v) the support membrane does not contain a drug.