additional polymeric resin this outer layer will normally be substantially similar to the inner layer although this is not required the outer polymer e g a pvdc or acrylic formulation is dissolved or otherwise dispersed in a solvent which does not permeate the solvent barrier layer thus the under layer is not contaminated by the solvent and the film can be readily dried in this way a film can be prepared with a thicker overall polymeric coating than would otherwise be economically possible fig1 shows a schematic cross section of a film prepared by the present invention layer 11 represents the base film which is coated with a vdc polymer layer 13 the solvent barrier layer 15 is next in succession and the outermost layer 17 is another vdc polymer layer while the above process has been set forth as coating a single side of the base film it is possible to coat both sides simultaneously resulting in a symmetrical multiple layered structure such a structure is shown in fig2 in which layers 13 39 15 39 and 17 39 correspond to layers 13 15 and 17 but are located on the opposite side of the base film 13 other coating schemes are also possible for example the above process can be repeated as desired to build up a multiple layer structure of any arbitrary degree of thickness such structures provided with separate and distinct vdc polymer layers provide the opportunity for precise tailoring of each layer to perform a specific function for example vdc polymer layers can be used for their barrier properties to prevent permeation by gases such.