Multilayer, heat-shrinkable film comprising a plurality of microlayers
First Claim
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1. A multilayer, heat-shrinkable film, comprising:
- a. a bulk layer; and
b. a microlayer section comprising at least ten microlayers, each of said microlayers having a thickness ranging from about 0.001 to 0.015 mil, 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 being at least 1;
2;
said film is stretch-oriented at a ratio of at least 4 in at least one direction along a length or width dimension of said film; and
said film has a total free shrink (ASTM D2732-03) of at least about 10% at 200°
F.; and
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.
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Abstract
A multilayer, heat-shrinkable film generally includes at least one bulk layer and a microlayer section comprising at least 10 microlayers, each of which has a thickness ranging from about 0.001 to 0.015 mil. The ratio of the thickness of any of the microlayers to the thickness of the bulk layer is at least about 1:2. The film has a total free shrink (ASTM D2732-03) of at least about 10% at 200° F.
58 Citations
9 Claims
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1. A multilayer, heat-shrinkable film, comprising:
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a. a bulk layer; and b. a microlayer section comprising at least ten microlayers, each of said microlayers having a thickness ranging from about 0.001 to 0.015 mil, 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 being at least 1;
2;
said film is stretch-oriented at a ratio of at least 4 in at least one direction along a length or width dimension of said film; and
said film has a total free shrink (ASTM D2732-03) of at least about 10% at 200°
F.; and
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification