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US 8,012,572 B2Granted
Multilayer, heat-shrinkable film comprising a plurality of microlayers
AssigneeCryovac, Inc.
InventorsRafizi Ramli, Larry Bikle McAllister, Anton L. Timmons, Bradford E. Webster, John R. Wolf, Christopher Brown, George D. Wofford
Life of this patent
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Abstract
A multilayer, heat-shrinkable film generally includes at least one bulk layer and a microlayer section comprising a plurality of microlayers. The ratio of the thickness of any of the microlayers to the thickness of the bulk layer ranges from about 1:2 to about 1:40.
Claims17
A multilayer, heat-shrinkable film, comprising:
- a. a bulk layer;
- and
- b. a microlayer section comprising a plurality of microlayers;
- wherein, each of said microlayers and said bulk layer have a thickness, the ratio of the thickness of any of said microlayers to the thickness of said bulk layer ranging from about 1:2 to about 1:40;
- wherein said microlayers each have a thickness ranging from about 0.001 to 0.015 mil, and said bulk layer has a thickness ranging from about 0.03 to 0.5 mil;
- wherein each microlayer comprises one or more of ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, polypropylene homopolymer or copolymer, ethylene/methacrylic acid copolymer, maleic-anhydride-grafted polyethylene, polyamide, or low density polyethylene;
- wherein, said heat-shrinkable film has a thickness of less than about 0.7 mil and an Elmendorf Tear value (ASTM D1922-06a) of at least 10 grams, as measured in at least one direction along a length or width dimension of said film;
- and wherein said film has an orientation ratio of at least 4, as measured in at least one direction along a length or width dimension of said film.
5 more elements
A multilayer, heat-shrinkable film, comprising:
- a. a bulk layer;
- and
- b. a microlayer section comprising a plurality of microlayers, at least one of said microlayers comprising a blend of two more polymers and having a composition that is different from at least one other microlayer;
- wherein each microlayer comprises one or more of ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, polypropylene homopolymer or copolymer, ethylene/methacrylic acid copolymer, maleic-anhydride-grafted polyethylene, polyamide, or low density polyethylene;
- wherein, each of said microlayers and said bulk layer have a thickness, the ratio of the thickness of any of said microlayers to the thickness of said bulk layer ranging from about 1:2 to about 1:40;
- wherein said microlayers each have a thickness ranging from about 0.001 to 0.015 mil, and said bulk layer has a thickness ranging from about 0.03 to 0.5 mil;
- wherein, said heat-shrinkable film has an Elmendorf Tear value (ASTM D1922-06a) of at least about 30 grams/mil, as measured in at least one direction along a length or width dimension of said film;
- and wherein said film has an orientation ratio of at least 4, as measured in at least one direction along a length or width dimension of said film.
5 more elements
Dependencies are inferred from the claim text.