Patent ID: 7045144

Claim:
Plaster containing an active agent ( 1 , 7 ) comprising at least one cover membrane ( 2 , 8 ) and an active membrane ( 3 , 9 ) based on a skin-compatible matrix ( 4 , 10 ), containing a molecular sieve which is loaded with at least one active agent (Z, Z 1 , Z 2 , Z 3 , Z 4 ), wherein the molecular sieve/active agent adduct ( 5 , 11 , 12 ), releases the active agent upon skin contact ( 6 , 13 ) of the active membrane, in conjunction with the transpired water of the skin, characterized in that the molecular sieve/active agent adduct ( 5 , 11 , 12 ) also contains water of crystallization, to the extent that the molecular sieve is partially dehydrated at a degree of dehydration of at least 20%, compared to a sufficient basic molar quantity (m) of water of crystallization of at least 100, said molecular sieve with the reduced molar quantity (m′) of water of crystallization being loaded with the active agent (Z, Z 1 , Z 2 , Z 3 , Z 4 ), so that water is adsorbed upon skin contact ( 6 , 13 ) of the active membrane ( 3 , 9 ) and the active agent is desorbed, whereupon the water of crystallization content of the molecular sieve increases, and the molecular sieve is a sodium aluminosilicate of the following formula: Na 86 [(AlO 2 ) 86 ×(SiO 2 ) 106 ]×m ( m ′)H 2 O.