Patent ID: 7341791

Claim:
A multi-coating system with gas-barrier properties that is able to undergo crosslinking by means of UV radiation, comprising: a first layer of coating comprising a solution that can undergo photo-crosslinking (I) by means of exposure to UV radiation, wherein said photo-crosslinkable solution (I) comprises polyvinyl alcohol (PVOH) and a substance photo-sensitive to UV radiation comprising in its molecule at least one aldehyde functional group and at least one carbon-carbon double bond (C═C); and a second layer of coating comprising a composition that can undergo photo-crosslinking (II) by means of exposure to UV radiation, wherein said photo-crosslinkable composition (II) comprises mixtures of at least one cationic resin which can be crosslinked by means of UV radiation selected from the group consisting of epoxy resins, polyol polyester resins, and a mixture thereof, and reactive diluent, and cationic photo-initiator; or at least one radically-crosslinkable acrylate resin, reactive diluent, and free radical photo-initiator; and wherein the multi-coating system prevents entry of oxygen and exit of carbon dioxide after the layers of coating the multi-coating system are crosslinked by means of UV radiation.