Patent ID: 8900696

Claim:
A biaxially oriented polyester film comprising at least one base layer (B) and a single dried antimicrobially active coating dispersion on at least one side of said film, said antimicrobial coating a) comprising an ammonium silane of the following formula (I): where R 1 and R 2 are in each case identical or different and, independently of each other, are hydrogen moieties or C1-C8-alkyl moieties, which are straight-chain or—in the case of C3-C8-alkyl moieties—can be branched; and where in aqueous dispersions, one, two or all of the R 1 moieties are hydrogen; n is greater than 0 and smaller than 10; m is greater than 0 and smaller than 30; X- is chloride, sulfate, or nitrate; and b) the thickness of the coating is smaller than 1 μm, and said film exhibits a reduction in number of Esherichia coli after 24 hours as measured in accordance with ASTM E2149-01 ranging from 99.5 to 99.9%.