Patent ID: 7705078

Claim:
An anti-microbial polyester film comprising a polyester substrate layer and an inorganic anti-microbial compound of formula (I): Ag a H b A c M 2 (PO 4 ) 3 .nH 2 O (I) wherein: A is at least one metal selected from alkali and alkaline earth metals; M is a tetravalent metal; a is in the range 0.4 to 0.5; b and c are positive numbers such that (a+b+mc)=1; m is the valence of metal ion A; and 0≦n≦6; wherein the anti-microbial compound is present in the substrate layer in an amount of from about 0.05 to about 0.7% by weight of the polyester material of the substrate layer and wherein the film is self-supporting.