Barrier packaging webs having metallized non-oriented film

A flexible packaging web

• (a) comprising a first ply comprising a non-oriented sealant film characterized by a secant modulus of less than 120,000 psi and an elongation at break of greater than 150%, wherein the non-oriented sealant film is a coextruded blown film, wherein the non-oriented sealant film comprises a thermoplastic base layer of ethylene/vinyl alcohol copolymer and a heat sealing layer of polyethylene, polyethylene copolymer, ionomer or blends thereof, and wherein the base layer of the non-oriented sealant film has a metal coating deposited thereon having a thickness of between 1.0 to 100 nanometers and an optical density of 1.0 to 3.0 which renders the entire surface of the non-oriented sealant film opaque;
• and
• (b) further comprising a second ply disposed adjacent to the metal coating, wherein the second ply comprises an oriented film of polyethylene terephthalate, polypropylene, polyimide or polylactic acid, or a film of paper or regenerated cellulose;
• and
• (c) wherein the packaging web has an oxygen gas transmission rate of between 0 to 0.5 cm3/100 in2/24 hours at 73° F. (0 to 7.75 cm3/m2/24 hours at 23° C.) and 0% relative humidity, a water vapor transmission rate of between 0 to 0.1 g/100 in2/24 hours at 100° F. (0 to 1.55 g/m2/24 hours at 38° C.) and 90% relative humidity, and a minimum heat seal strength of 2,000 g/in (g/2.54 cm) at 280° F. (138° C.).

A flexible packaging web

• (a) comprising a first ply comprising a non-oriented sealant film characterized by a secant modulus of less than 120,000 psi and an elongation at break of greater than 150%, wherein the non-oriented sealant film is a coextruded blown film, wherein the non-oriented sealant film comprises a thermoplastic base layer of ethylene/norbornene copolymer and a heat sealing layer of polyethylene, polyethylene copolymer, ionomer or blends thereof, and wherein the base layer of the non-oriented sealant film has a metal coating deposited thereon having a thickness of between 1.0 to 100 nanometers and an optical density of 1.0 to 3.0 which renders the entire surface of the non-oriented sealant film opaque;
• and
• (b) further comprising a second ply disposed adjacent to the metal coating, wherein the second ply comprises an oriented film of polyethylene terephthalate, polypropylene, polyamide or polylactic acid, or a film of paper or regenerated cellulose;
• and
• (c) wherein the packaging web has an oxygen gas transmission rate of between 0 to 0.5 cm3/100 in2/24 hours at 73° F. (0 to 7.75 cm3/m2/24 hours at 23° C.) and 0% relative humidity, a water vapor transmission rate of between 0 to 0.1 g/100 in2/24 hours at 100° F. (0 to 1.55 g/m2/24 hours at 38° C.) and 90% relative humidity, and a minimum heat seal strength of 2,000 g/in (g/2.54 cm) at 280° F. (138° C.).