ANTI-MICROBIAL POLYMERIC FILM AND METHOD OF MANUFACTURE OF SAID FILM

摘要

A method of manufacture of an anti-microbial polymeric film comprising coextruding a polymeric substrate layer comprising a first layer of a first polymeric material and a second layer of a second polymeric material wherein the crystalline melting temperature (TM2) of said second polymeric material is lower than the crystalline melting temperature (TM1) of the first polymeric material; stretching the coextruded substrate in a first direction; optionally stretching the substrate layer in a second, orthogonal direction; disposing on the surface of the polymeric second layer a composition comprising a particulate antimicrobial compound and a liquid vehicle, and preferably also a surfactant; and heat-setting the stretched film at a temperature above the crystalline melting temperature (TM2) of the second polymeric material but below the crystalline melting temperature (TMI) of the first polymeric material; wherein the composition is applied to the polymeric second layer after the coextrusion step but before the heat-setting step; such that in the final film said second layer comprises said anti-microbial compound in an amount of from about 1 to about 80 % by weight of said polymeric material of the second layer is described. Anti-microbial films are also described.