Elastomer containing multilayer film and method of manufacture
AssigneeCryovac, Inc.
InventorsAngelica Bergen Smith, Paul Satterwhite, John Myers, Sarah Lynn Geer
Life of this patent
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Abstract
A multilayer film including at least one abuse layer. The abuse layer being a blend of one or more polyamides and an anhydride grafted or maleic anhydride grafted elastomer. Anhydride or maleic anhydride grafted elastomers include ethylene propylene diene monomer, ethylene propylene copolymer, styrene-ethylene-butylene-styrene, ethylene/octene copolymer and blends thereof. A pouch for made from the multilayer film, a method for packaging a food product with the multilayer film are also disclosed.
Claims19
A multilayer film comprising:
- at least one outer layer comprising at least 70% by weight of one or more of an ethylene/alpha-olefin copolymer;
- and at least one inner layer being an abuse layer comprising a blend of:
- at least 1% by weight of an anhydride grafted elastomer selected from the group consisting of ethylene propylene diene monomer, ethylene propylene copolymer, styrene-ethylene-butylene-styrene, ethylene/octene copolymer and blends thereof, the anhydride grafted elastomer having a grafting level between 0.1-3.0 wt %;
- and
- at least 25% by weight one or more polyamides;
- wherein at least 5%, 10%, 20%, 30%, 40% or 50% by weight of the multilayer film being of one or more polyamides;
- the multilayer film having a haze measured according to ASTM D1003 not higher than 20%, and/or a gloss measured according to ASTM D 2457 of at least 90.
A food package comprising:
- a food product;
- a pouch containing the food product, the pouch being made from a multilayer film comprising:
- at least one outer layer comprising at least 70% by weight of one or more of an ethylene/alpha-olefin copolymer;
- and at least one inner layer being an abuse layer comprising a blend of:
- at least 1% by weight of an anhydride grafted elastomer selected from the group consisting of ethylene propylene diene monomer, ethylene propylene copolymer, styrene-ethylene-butylene-styrene, ethylene/octene copolymer and blends thereof, the anhydride grafted elastomer having a grafting level between 0.1-3.0 wt %;
- and
- at least 25% by weight one or more polyamides;
- wherein at least 5%, 10%, 20%, 30%, 40% or 50% by weight of the multilayer film being of one or more polyamides;
- the multilayer film having a haze measured according to ASTM D1003 not higher than 20%, and/or a gloss measured according to ASTM D 2457 of at least 90.
A method of forming a packaged article comprising the steps of:
- a. providing a multilayer film, the multilayer film comprising:
- i. at least one outer layer comprising at least 70% by weight of one or more of an ethylene/alpha-olefin copolymer;
- ii. and at least one inner layer being an abuse layer comprising a blend of:
- at least 1% by weight of an anhydride grafted elastomer selected from the group consisting of ethylene propylene diene monomer, ethylene propylene copolymer, styrene-ethylene-butylene-styrene, ethylene/octene copolymer and blends thereof, the anhydride grafted elastomer having a grafting level between 0.1-3.0 wt %;
- and
- at least 25% by weight one or more polyamides;
- iii. at least 5%, 10%, 20%, 30%, 40% or 50% by weight of the multilayer film being of one or more polyamides;
- the multilayer film having a haze measured according to ASTM D1003 not higher than 20%, and/or a gloss measured according to ASTM D 2457 of at least 90;
- b. forming the film into a tube in a vertical form fill and seal apparatus;
- c. filling the tube with a food product;
- and
- d. closing the tube to form a sealed pouch containing the food product.
Dependencies are inferred from the claim text.