Patent ID: 7872167

Claim:
An adhesive composition for preparing an adhesive layer for medical patches or for transdermal therapeutic systems, said adhesive layer having a tackiness which is activated and/or increased by contact with moisture or by absorption of moisture, wherein said adhesive layer comprises at least one pressure-sensitive adhesive polymer and at least one component selected from the group consisting of polyethers and acid anhydrides including acids and salts of acid anhydrides, said composition comprising: polyvinylalcohol and at least one polymethyl vinyl ether-polymaleic acid anhydride copolymer, wherein the portion of polyvinylalcohol is 1-80%-wt, relative to the sum of said two polymers; at least one film-forming polymer being at least one selected from the group consisting of non-pressure-sensitive adhesive polyacrylates and at least one pressure-sensitive adhesive polymer; and a solvent portion including a solvent.