Low water-vapor permeable composite film and packaging structure

A low water-vapor permeable composite film, comprising:

• a 3-layered co-extruded biaxial-oriented film formed of polyester films or polypropylene films comprising a first layer, a second layer and a third layer stacked in sequence;
• and
• an alternate structure comprising a plurality of organic protection layers and a plurality of inorganic layers are formed on the 3-layered co-extruded biaxial-oriented film, wherein the plurality of organic protection layers and the plurality of inorganic layers are stacked alternately, and the inorganic layers are formed by atom layer deposition,
• wherein when the 3-layered co-extruded biaxial-oriented film is formed of polyester films, the first layer comprises polyethylene terephthalate, glycol-modified polyethylene terephthalate, acid-modified polyethylene terephthalate, glycol-modified polycyclohexanedimethylene terephthalate or combinations thereof, the second layer comprises poly(ethylene terephthalate), poly(propylene terephthalate), polybutylene terephthalate, polyethylene naphthalate or combinations thereof, and the third layer comprises polyethylene terephthalate, glycol-modified polyethylene terephthalate, acid-modified polyethylene terephthalate, glycol-modified polycyclohexanedimethylene terephthalate or combinations thereof, and the first layer further comprises an anti:block agent,
• wherein when the 3-layered co-extruded biaxial-oriented film is formed of polypropylene films, the first layer comprises polypropylene, ethylene-propylene copolymer, ethylene-propylene-butylene copolymer, high density polyethylene or combinations thereof, the second layer comprises polypropylene, ethylene-propylene copolymer or combinations thereof, and the third layer comprises polypropylene, ethylene-propylene copolymer, ethylene-propylene-butylene copolymer, high density polyethylene or combinations thereof, and the first layer further comprises an anti-block agent.