Patent ID: 7427444

Claim:
In a cellulosic product in contact with a material containing moisture, an oil, grease, solvent or fat comprised of a cellulosic substrate having a polymer coating applied thereto which imparts a barrier against said moisture, oil, grease, solvent or fat contained in said material when in contact therewith, the improvement which comprises: said polymer coating comprising an ethylene-vinyl acetate polymer comprised of crystalline ethylene segments prepared by aqueous emulsion polymerization of ethylene and vinyl acetate in the presence of a stabilizing system consisting essentially of a surfactant or a protective colloid in combination with a surfactant, said ethylene-vinyl acetate polymer having: (a) a crystalline melting point ranging from 35 to 110° C. measured at a heat rate of 20° C. per minute; and, (b) a tensile storage modulus of at least 1×10 5 dynes/cm 2 at a temperature of 115° C. and measured at 6.28 rad/sec.