Multilayer stretch/shrink film
AssigneeViskase Corporation
InventorDonald J. Ralph
Life of this patent
Estimating the term…
Abstract
A biaxially oriented heat shrinkable multilayer stretch film useful as a trayed poultry overwrap includes outer layers each comprising a blend of VLDPE (density below about 0.914 g/cm.sup.3 and an ethylene alpha-olefin plastomer (density below about 0.90 g/cm.sup.3).
Claims29
A biaxially oriented heat-shrinkable multilayer stretch film comprising at least a first outer layer, a second outer layer, and a core layer between said first and second outer layers, said first and second outer layers each comprising a blend of between about 20 and about 35 weight % ethylene alpha-olefin plastomer copolymer of density below about 0.90 g/cm.sup.3, and between about 65 and about 80 weight % VLDPE of density at least 0.912 and below about 0.914 g/cm.sup.3, and said core layer comprising ethylene alpha-olefin copolymer having a higher melting point than the melting point(s) of either of said first and second outer layers.
A biaxially oriented heat-shrinkable multilayer stretch film comprising at least a first outer layer, a second outer layer, and a core layer between said first and second outer layers, said first and second outer layers each comprising a blend of between about 20 and about 35 wt. % ethylene alpha-olefin plastomer copolymer of density below about 0.90 g/cm.sup.3, and between about 65 and about 80 wt. % VLDPE wherein said VLDPE comprises a blend of a first ethylene alpha olefin having a density of about 0.912 g/cm.sup.2 and a second ethylene alpha olefin which is a butene comonomer having a density of about 0.900 g/cm.sup.2, a melt index of about 3.5, a melting point of about 92.degree. C. and an Mw/Mn ratio of about 2 and said core layer comprises ethylene alpha-olefin copolymers having a high melting point than the melting point of either of each first and second outer layers.
Dependencies are inferred from the claim text.