Patent ID: 7473439

Claim:
A method of coating a polymeric film substrate comprising: (i) coating at least one surface of the film substrate with a coating solution comprising at least one solvent which comprises water, 100 phr by weight of at least one ethylene vinyl alcohol copolymer and from about 0.1 phr to about 25 phr by weight of at least one cross-linking agent and (ii) drying the coating solution coated on the at least one surface of the substrate to remove at least a portion of the at least one solvent to provide a cross-linked coating layer on the at least one surface of the film substrate at a concentration of about 0.2 g/m 2 to about 3 g/m 2 , wherein prior to being cross-linked the at least one ethylene vinyl alcohol copolymer has: (a) a solubility in the solvent; (b) from about 80 mol % to about 95 mol % of vinyl alcohol units and from about 5 mol % to about 20 mol % of the ethylene derived units; (c) a degree of hydrolysis of about 75% to about 100%; (d) a degree of polymerization of about 300 to about 4,000 and a number average molecular weight of about 13,300 to about 400,000; (e) a viscosity of between about 3 cps and about 40 cps at 4% solids and 20° C. and a pH of 4 to 7.5; and (f) repeating units derived from ethylene and vinyl alcohol.