Patent US8945702

Barrier packaging webs having metallized non-oriented film
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US8945702

1. A flexible packaging web (4) (3)

(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.).

2. The packaging web of claim 1 wherein the metal coating is a vacuum deposited aluminum or aluminum-containing alloy. (0)

3. The packaging web of claim 1 wherein the base layer has a thickness of between 0.05 to 10 mils (1.27 to 254 microns). (0)

4. The packaging web of claim 1 wherein the base layer comprises an ethylene/vinyl alcohol copolymer and 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.). (0)

5. The packaging web of claim 1 wherein the base layer comprises a polyamide and 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.). (0)

6. A flexible packaging web (2) (3)

(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.).

7. The packaging web of claim 6 wherein the metal coating is a vacuum deposited aluminum or aluminum-containing alloy. (0)

8. The packaging web of claim 6 wherein the base layer has a thickness of between 0.05 to 10 mils (1.27 to 254 microns). (0)

9. A flexible packaging web (2) (3)

(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

10. The packaging web of claim 9 wherein the metal coating is a vacuum deposited aluminum or aluminum-containing alloy. (0)

11. The packaging web of claim 9 wherein the base layer has a thickness of between 0.05 to 10 mils (1.27 to 254 microns). (0)

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Patent US8945702

Barrier packaging webs having metallized non-oriented film

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