Polylmeric films and packages produced therefrom
OwnerRoy Christopherson, David Thomas Stellinventors
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Abstract
Heat sealable polymeric films having a heat sealable surface comprising a blend of at least one polyethylene and a cyclic olefin/ethylene copolymer having a glass transition temperature Tg of greater than 30° C. Such films can be used to form packages showing good peelability, usually with evidence of peeling, after heat sealing to various substrates. These packages are of particular use for packaging foodstuffs and medicaments.
Claims15
A heat sealable polymeric film having a heat sealable surface comprising a blend of at least one polyethylene and a cyclic olefin/ethylene copolymer having a glass transition temperature Tg of greater than 30° C.
A film according to either of the preceding claims, wherein the copolymer has a glass transition temperature Tg of from 50 to 175° C.
A film according to any of the preceding claims, wherein the blend comprises from 60 to 90 wt % of polyethylene and from 40 to 10 wt % of the cyclic olefin/ethylene copolymer.
A film according to any of the preceding claims, wherein the cyclic olefin of the cyclic olefin/ethylene copolymer comprises norbornene.
A film according to any of the preceding claims, wherein the polyethylene has a density of from 0.915 g/cm3 to 0.935 g/cm3.
A film according to any of the preceding claims, wherein the heat sealable surface is formed by an outer layer of a multi-layered polymeric film.
A film according to any of the preceding claims, including a layer of a polymer having high barrier properties to oxygen.
A peelable open package comprising a film according to any of the preceding claims heat sealed to a coated metal foil, a polymeric film or a non-woven web.
Dependencies are inferred from the claim text.