Process for the preparation of oxygen barrier film

The invention relates to a process for the preparation of an oxygen barrier film having an oxygen barrier layer and a treated substrate, comprising the steps of: a) subjecting a polyolefin substrate to a surface treatment to 5 obtain the treated substrate wherein the surface under the parts of the curves corresponding to the C-O, C-N and C=O groups is at least 10% based on the total surface under the curve as obtained by X-ray photoelectron spectroscopy (XPS), b) applying an aqueous or hydroalcoholic coating composition comprising 0.1 to 25 10 wt% of polyvinyl alcohol and 0.1 to 30 wt% of a metal alkoxide on the treated substrate obtained by step a) and c) drying the coating composition to obtain the oxygen barrier layer resulting in the oxygen barrier film.