Abstract: A coextruded multilayer polymeric film for use as a chub film having a core layer of an oxygen barrier material and layers disposed on either side of the core layer comprising a blend of an ethylene alpha-olefin copolymer formed from a polymerization reaction in the presence of a single site catalyst and a tie or adhesive, or alternatively a blend of a tie or adhesive and an ethylene acid copolymer, including a neutralized ethylene acid copolymer such as an ionomer. The film also comprises outer sealant layers comprising a blend of an ethylene alpha-olefin copolymer formed from a polymerization reaction in the presence of a single site catalyst and optionally a compound selected from the group consisting of LLDPE, having a density of between about 0.910 g/cc to about 0.940 g/cc, and an ethylene acid copolymer.
January 25, 1995
Date of Patent:
October 21, 1997
American National Can Company
Keith D. Lind, Johnny Q. Zheng, Gregory K. Jones, Dennis Kittel
Abstract: The present invention relates to an oriented, particularly a biaxially oriented, sealable, metallisable multilayer film, characterised in that it is built up as follows:ABCBDa) where C is the core layer comprising isotactic polypropylene with an MFI between 0.5 and 4.5 g/10 min,b) A is the base layer for vacuum evaporation, comprising 0.1-0.5% of an organic or inorganic spacer and 1 to 10% of an ethylene/octene copolymer with a density <0.915 g/cm.sup.3, and 89.5 to 98.9% of a heat-sealable propylene/ethylene copolymer with an ethylene content of 1 to 8%,c) B represents the two intermediate layers comprising a propylene homopolymer with an MFI between 2 and 12 g/10 min,d) and D is the sealable layer comprising an olefinic homo-, co- or terpolymer and 0.1 to 0.5% of an inorganic or organic spacer, or a mixture of the two classes of spacer. The film is desirably metallized with a metal or metal oxide layer.
Abstract: A heat shrinkable multilayer film which includes two outer layers consisting essentially of a polyethylene resin, and one or more inner layers interposed between the outer layers, wherein at least one of the inner layers comprises a blend of a polypropylene resin and a substantially linear ethylene/alpha-olefin copolymer, wherein said copolymer has a molecular weight distribution Mw/Mn of not greater than about 2 and a melt flow ratio I.sub.10 /I.sub.2 of not smaller than 7.0.