TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The resin composition comprises 10-80 wt.% oxazoline group-containing water-soluble polymer comprising 0.4-5.0 mmol/g oxazoline groups. The composition contains at least one resin selected from water-compatible acrylic resin, water-compatible polyurethane-based resin and water-compatible polyester-based resin, preferably 10-80 wt.% water-compatible acrylic resin of a water paint containing no emulsifying agent, and 10-70 wt.% water-compatible polyurethane-based resin.Preferred Film: The plastic film comprises a polyester of 10-100 wt.% reclaimed polyester, or contains polypropylene, polyamides, polyvinyl alcohol or a partially hydrolyzed product of ethylene-vinyl acetate copolymer. The coating layer is stretched in at least one direction after coating for formation of the coating layer is applied on the plastic film. The water droplet contact angle of the coating layer is not less than 60 degrees. EXAMPLE - Polyethylene terephthalate (PET) containing 50 wt.% reclaimed PET and having an intrinsic viscosity of 0.62, was extruded at 280-300 degrees C through an extrusion die, and cast on a cooling drum by an electrostatic pinning method, obtaining an amorphous polyester sheet 150 mum thick. The obtained polyester sheet was stretched at 95 degrees C to 3.5 times in the longitudinal direction. An aqueous coating solution comprising a resin composition of 60 (5) wt.% aqueous EPOCROSS WS-500 (RTM) (resin) solution (40 wt.% oxazoline group-containing water-soluble polymer (4.5 mmol/g oxazoline groups; volume ratio of water to 1-methoxy-2-isopropanol of 1:2)), 20 (85) wt.% water paint containing a water-compatible acrylic resin (non-emulsion type; produced by mixing 40 pts.wt. ethyl acetate, 30 pts.wt. methyl methacrylate, 20 pts.wt. methacrylic acid and 10 parts by weight (pts.wt.) glycidyl methacrylate, solution polymerized in ethyl alcohol and having pH 7.5) and 20 (10) wt.% water paint containing a water-compatible polyurethane-based resin (produced from 664 parts (pts.) terephthalic acid, 631 pts. isophthalic acid, 472 pts. 1,4-butane diol and 447 pts. neopentyl glycol, reacted with 321 pts. adipic acid and 268 pts. dimethylol propionic acid, and 160 pts. hexamethylene diisocyanate and 1880 pts. polyester polyol A) was applied onto one surface of the longitudinally stretched film. The coated film was further stretched at 110 degrees C to 3.5 times in the transverse direction and then heat-treated at 230 degrees C, obtaining a 12 mum-thick biaxially stretched polyester film as a base film on which a coating layer having a thickness of 0.1 mum was formed.    A silicon oxide layer (500 Angstrom thick) was deposited on the coated surface of the polyester film. The resultant deposited polyester film(s) showed: Adhesion property not less than 200 g ( less than 100 g); Contact angle = 73 (83) degrees; Water vapor permeability (40 degrees C / 90 % RH) less than 1 (less than 1) g/m2.24 hours; oxygen permeability after deposition, after boiling (90 degreesC, 30 mins) and after printing less than 1 (less than 1), less than 1 (not less than 10) and less than 1 (1-10) cc/m2.24h.atm.; where values in brackets represent the comparative.