High-shrink, high-strength multilayer film containing three-component blend
AssigneeCryovac, Inc.
InventorsAshley Wynne, Kelly Ahlgren, Miles Johnston, Rebecca Higginbotham
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Abstract
A heat-shrinkable film comprises a blend of 35-75 wt % of an ethylene-based polymer, 10-45 wt % of an ethylene/unsaturated ester copolymer, and 5-30 wt % of a plastomer, with the blend making up at least 20 wt % of the film. The ethylene-based polymer has a peak melt point ≥95° C. The plastomer has a peak melt point ≤90° C. and a melt index of ≤1.1 g/10 min. The film comprises a cross-linked polymer network which has been strained by solid state orientation. The film has a total free shrink at 85° C. of at least 90% and an energy-to-break of at least 0.70 J/mil.
Claims20
A heat-shrinkable film comprising a blend of:
- A) an ethylene-based polymer having a peak melting point ≥95° C., the ethylene-based polymer making up from 35 wt % to 75 wt % of the blend, based on total blend weight;
- B) an ethylene/unsaturated ester copolymer making up from 10 wt % to 45 wt % of the blend, based on total blend weight;
- and
- C) a plastomer having a peak melting point ≤90° C. and a melt index of ≤1.1 g/10 min, the plastomer making up from 5 wt % to 30 wt % of the blend, based on total blend weight;
- and
- wherein the film comprises a cross-linked polymer network which has been strained by solid state orientation, and the blend makes up at least 20 wt % of the film, based on total film weight, and the film has a total free shrink at 85° C. of at least 90% measured in accordance with ASTM D2732, and an instrumented impact energy-to-break of at least 0.70 J/mil, measured in accordance with ASTM D3763.
A heat-shrinkable film comprising a blend of:
- A) an ethylene-based polymer having a peak melting point ≥95° C., the ethylene-based polymer making up from 35 wt % to 75 wt % of the blend, based on total blend weight;
- B) an ethylene/unsaturated ester copolymer making up from 10 wt % to 45 wt % of the blend, based on total blend weight;
- and
- C) a plastomer having a peak melting point ≤90° C. and a melt index of ≤1.1 g/10 min, the plastomer making up from 5 wt % to 30 wt % of the blend, based on total blend weight;
- and
- wherein the film comprises a cross-linked polymer network which has been strained by solid state orientation, and the blend makes up at least 20 wt % of the film, based on total film weight, and the film has a total free shrink at 85° C. of at least 90% measured in accordance with ASTM D2732, and an instrumented impact peak load strength of at least 77 Newtons/mil measured in accordance with ASTM D3763.
A packaging article comprising a heat-shrinkable film which comprises a blend of:
- A) an ethylene-based polymer having a peak melting point ≥95° C., the ethylene-based polymer making up from 35 wt % to 75 wt % of the blend, based on total blend weight;
- B) an ethylene/unsaturated ester copolymer making up from 10 wt % to 45 wt % of the blend, based on total blend weight;
- and
- C) a plastomer having a peak melting point ≤90° C. and a melt index of ≤1.1 g/10 min, the plastomer making up from 5 wt % to 30 wt % of the blend, based on total blend weight;
- and
- wherein the film comprises a cross-linked polymer network which has been strained by solid state orientation, and the blend makes up at least 20 wt % of the film, based on total film weight, and the film has a total free shrink at 85° C. of at least 90% measured in accordance with ASTM D2732, and an instrumented impact energy-to-break of at least 0.70 J/mil, measured in accordance with ASTM D3763, and the film is heat sealed to itself.
Dependencies are inferred from the claim text.