POLYOLEFIN FILMS OF IMPROVED IMPERMEABILITY AND PROCESS FOR THEIR PRODUCTION

摘要

Polyolefinic films having improved impermeability characteristics to gases and vapors, said films being coated on either one or both its surfaces by a layer of a copolymer containing functional hydroxylic groups, functional acid carboxylic groups and optionally-esteric groups and obtained by hydrolysis of copolymers consisting of an unsaturated ester and of an unsaturated acid or corresponding anhydride.