Shrink film and methods relating thereto
First Claim
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1. A multilayer heat-shrinking film structure having a core of one or more core layers and an outer layer on each side of the core, the multilayer structure core consisting essentially of:
- a) a metallocene catalyzed polyolefin first component having a narrow melting point, the melting point being less than about 115°
C. and the first component having a molecular weight distribution (Mw/Mn) within the range of about 1 to about 3 and a density less than about 0.92 grams per cubic centimeter; and
b) a polyolefin second component having a melting point at least about 10°
C. greater than the first component and an orientation temperature at least about 2°
C. less than its melting point whereby the weight ratio of component a) to b) is in the range of about 50-98;
2-50.c) 0-10 weight parts ethylene vinyl acetate, ionomer or polyester.wherein the weight parts of a), b) and c) total 100 and the core is about 40 to 95% of the total thickness of the multilayer structure.
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Abstract
The present invention relates generally to shrink film compositions having improved properties, particularly improved shrink range, optics, toughness, (low) shrink force, (low) extractables and the like. More specifically, the improved shrink films of the present invention are directed to alloys or combinations comprising precise combinations of "narrow, substantially singular" melting point polyethylene with a higher melting point (by at least about 10° C.), polyethylene.
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Citations
3 Claims
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1. A multilayer heat-shrinking film structure having a core of one or more core layers and an outer layer on each side of the core, the multilayer structure core consisting essentially of:
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a) a metallocene catalyzed polyolefin first component having a narrow melting point, the melting point being less than about 115°
C. and the first component having a molecular weight distribution (Mw/Mn) within the range of about 1 to about 3 and a density less than about 0.92 grams per cubic centimeter; andb) a polyolefin second component having a melting point at least about 10°
C. greater than the first component and an orientation temperature at least about 2°
C. less than its melting point whereby the weight ratio of component a) to b) is in the range of about 50-98;
2-50.c) 0-10 weight parts ethylene vinyl acetate, ionomer or polyester. wherein the weight parts of a), b) and c) total 100 and the core is about 40 to 95% of the total thickness of the multilayer structure. - View Dependent Claims (2)
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3. A monolayer heat-shrink film consisting essentially of:
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a) a metallocene catalyzed polyolefin first component having a narrow melting point, the melting point being less than about 115°
C. and the first component having a molecular weight distribution (Mw/Mn) within the range of about 1 to about 3 and a density less than about 0.92 grams per cubic centimeter; andb) a polyolefin second component having a melting point at least about 10°
C. greater than the first component and an orientation temperature at least about 2°
C. less than its melting point whereby the weight ratio of component a) to b) is in the range of about 50-98;
2-50.c) 0-10 weight parts ethylene vinyl acetate, ionomer or polyester.
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Specification
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Current AssigneeClysar, LLC (Cove Point Portfolio Holdings LLC)
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Original AssigneeE. I. du Pont de Nemours and Company (Corteva, Inc.)
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InventorsGarza, Oscar Trini, Synder, John Douglas, Kneale, Timothy Michael
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Primary Examiner(s)BUFFALOW, EDITH
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Application NumberUS08/301,524Time in Patent Office1,224 DaysField of Search525/240, 428/34.7, 428/34.9, 428/515, 428/910US Class Current428/515CPC Class CodesB32B 2270/00 Resin or rubber layer conta...B32B 2307/518 bi-axiallyB32B 2307/718 Weight, e.g. weight per squ...B32B 2307/736 ShrinkableB32B 2309/025 Temperature vs time profilesB32B 2309/105 ThicknessB32B 2323/046 LDPE, i.e. low density poly...B32B 27/08 of synthetic resinB32B 27/32 comprising polyolefins comp...C08J 2323/08 Copolymers of ethene C08J23...C08J 5/18 Manufacture of films or sheetsC08L 23/06 PolyetheneC08L 23/08 Copolymers of ethene C08L23...C08L 23/0815 Copolymers of ethene with a...C08L 2666/04 Macromolecular compounds ac...Y10S 428/91 Product with molecular orie...Y10T 428/1321 Polymer or resin containing...Y10T 428/1328 Shrinkable or shrunk [e.g.,...Y10T 428/31855 Of addition polymer from un...Y10T 428/31909 Next to second addition pol...
