METHOD OF PREPARING A BARRIER FILM FOR BLISTER PACKS

摘要

A method for preparing a barrier film comprising the steps of: (i) providing a substrate; (ii) applying in a single coating step an polymer latex on the substrate to form a single layer of the polymer on the substrate (iii) drying the single layer of the polymer; characterized in that the single layer has a dry coating weight (DCW) of at least 20 g/m2 of polymer and is dried at a dry temperature (Td) of at least the film formation temperature (Tf) the polymer latex at a relative humidity (RH) according to the following formula: RH = 15 + 1.25 * DCW.