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/m 2 of polymer and is dried at a dry temperature (Td) of at least the film formation temperature (Tf) of the polymer latex at a relative humidity (RH) according to the following formula: RH = 15 + 1.25 * DCW .