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Patent US8945702
Issued 2015-02-03
Barrier Packaging Webs Having Metallized Non-oriented Film
The present invention provides flexible packaging webs comprising a non-oriented metallized 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 metallized sealant film comprises (1) a thermoplastic base layer of a material selected from the group consisting of ethylene/vinyl alcohol copolymer, ethylene/acrylic acid copolymer, ethylene/norbornene copolymer, polyamide and blends thereof; (2) a metal coating deposited on the base layer and having an optical density of 1.0 to 3.0; and (3) a heat sealing layer. The packaging webs of the present invention each exhibit an oxygen gas transmission rate of between 0 to 10.0 cm3/100 in2/24 hours at 73° F. (0 to 155 cm3/m2/24 hours at 23° C.) and 0% relative humidity and 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. The sealant films are formed by a blown coextrusion method.
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- 1. A flexible packaging web
(a) 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 a material selected from the group consisting of ethylene/vinyl alcohol copolymer, ethylene/norbornene copolymer, ethylene/acrylic acid copolymer, polyamide and blends thereof and a heat sealing layer of a material selected from the group consisting of polyethylene, polyethylene copolymer, ionomer and 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; (b) further comprising an oriented film comprising 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 10.0 cm3/100 in2/24 hours at 73° F. (0 to 155 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.).
- 6. 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.).
- 9. 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.).
