초록 ▼

A metallized, multilayer film suitable for packaging applications is provided which comprises a first skin layer comprising a thermoplastic selected from the group consisting of high density polyethylene, ethylene vinyl alcohol copolymer, medium density polyethylene, linear low density polyethylene,

A metallized, multilayer film suitable for packaging applications is provided which comprises a first skin layer comprising a thermoplastic selected from the group consisting of high density polyethylene, ethylene vinyl alcohol copolymer, medium density polyethylene, linear low density polyethylene, ethylene-propylene-butylene terpolymer, propylene-butylene copolymer, and amorphous polyamide, a metallized layer adjacent to the first skin layer, and a core layer comprising high crystallinity polypropylene homopolymer with an intermolecular stereoregularity greater than 93%. Additionally, low density polyethylene, EMA, EVA, or EAA may be extrusion laminated to the metallized side of the metallized, multilayer film at a web tension sufficient to prevent metal crazing of the vacuum deposited aluminum layer. A method for making the film is also provided.

대표청구항 ▼

1. A metallized multilayer film comprising:(a) a core layer comprising high crystallinity polypropylene homopolymer with a xylene soluble level of 1.5% or less wherein said high crystallinity polypropylene homopolymer is a product of Ziegler-Natta catalysis; (b) a first skin layer adjacent to said c

1. A metallized multilayer film comprising:(a) a core layer comprising high crystallinity polypropylene homopolymer with a xylene soluble level of 1.5% or less wherein said high crystallinity polypropylene homopolymer is a product of Ziegler-Natta catalysis; (b) a first skin layer adjacent to said core layer wherein said skin layer comprises a thermoplastic selected from the group consisting of high density polyethylene, ethylene vinyl alcohol copolymer, medium density polyethylene, linear low density polyethylene, ethylene-propylene random copolymer, ethylene-propylene-butylene texpolynier, propylene-butylene copolymer, and amorphous polyamide; and (c) a metallized layer adjacent to said first skin layer. 2. The metallized multilayer film according to claim 1, wherein the shrinkage of said film in the longitudinal direction and in the transverse direction is greater than 5%.3. The metallized multilayer film according to claim 1, wherein said metallized layer is from about 1.5 to about 3.0 optical density.4. The metallized multilayer film according to claim 1, wherein said first skin layer is from about 0.5 micron to about 2.0 micron in thickness.5. The metallized multilayer film according to claim 1, wherein said core layer is from about 10 micron to about 48 micron in thickness.6. The metallized multilayer film according to claim 1 wherein the total thickness of the film is from about 12 microni to about 50 microns.7. The metallized multilayer film according to claim 1 wherein said metallized layer comprises aluminum.8. The metallized multilayer film according to claim 7, further comprising a tie layer interposed between said first skin layer and said core layer.9. The metallized multilayer film according to claim 8, wherein said tie layer comprises at least one of a maleic anhydride-modified polypropylene homopolymer and a maleic anhydride-modified polypropylene copolymer.10. The metallized multilayer film according to claim 1, further comprising a second skin layer adjacent to said core layer and on a side of said core layer opposite said first skin layer, said second skin layer comprising a polyolefin selected from the group consisting of ethylene-propylene random copolymer, ethylene-propylene-butylene terpolymer, propylene-butylene copolymer, and ethylene-propylene impact copolymer.11. the metallized multilayer film according to claim 10, wherein said second skin layer is from about 0.5 micron to about 8.0 micron in thickness.12. The metallized multilayer film according to claim 4, wherein said first skin layer exposed to a treatment selected from the group consisting of flame treatment, corona treatment and plasma treatment prior to metallization.13. The metallized multilayer film according to claim 11, wherein said second skin layer is exposed to a treatment selected from the group consisting of corona treatment, flame treatment and plasma treatment.14. The metallized multilayer film of claim 1, wherein said core layer includes greater than or equal to 50 wt % of said high crystallinity polypropylene homopolymer.15. The metallized multilayer film of claim 1, wherein said core layer includes greater than or equal to 65 wt % high crystallinity of said polypropylene homopolymer.16. The metallized multilayer film of claim 1, wherein said core layer further comprises an additive selected from the group consisting of:i) an opacifying agent selected from the group consisting of iron oxide, carbon black, aluminum, TiO2, and talc, said opacifying agent being present in said core layer in an amount ranging from about 1 wt % to about 15 wt %, based on the total weight of the core layer; ii) a cavitating agent selected from the group consisting of polybutene terephthalatc, nylon, solid glass spheres, hollow glass spheres, metal beads, metal spheres, ceramic spheres, and CaCO3, said cavitating agent being present in said core layer in an amount ranging from about 1 wt % to about 20 wt %, based on the total weight of the core layer, said cavitating agent having a mean particle size in the range of from 0.1 micron to 10 microns; and iii) a hydrocarbon resin, said resin being one of petroleum resin, terpene resin, styrene resin, cyclopentadiene resin, saturated alicyclic resin, or combinations thereof, said resin having a number average molecular weight <5000, and a softening point ranging from about 60° C. to about 180° C., said resin being present in said core layer at <10 weight percent. 17. A metallized multilayer film comprising:1) a first component comprising: (a) a core layer comprising a high crystallinity polypropylene homopolymer with a xylene soluble level of 1.5% or less wherein said high crystallinity polypropylene homoplymer is a product of Ziegler-Natta catalysis; (b) a first skin layer adjacent to said core layer wherein said skin layer comprises high density polyethylene; (c) a vacuum deposited aluminum layer adjacent to said first skin layer; and 2) a second component comprising a polymer selected from at least one of low density polyethylene, EVA, EMA and EAA that is extrusion laminated to said aluminum layer of said first component at a web tension sufficient to prevent metal crazing of said vacuum deposited aluminum layer. 18. The metallized multilayer film according to claim 17, wherein the shrinkage of said film in the longitudinal direction and in the transverse direction is greater than 5%.19. The metallized multilayer film according to claim 17, wherein said web tension is up to 1 pound per linear inch on said metallized multilayer film during said extrusion lamination.20. The metallized multilayer film according to claim 17, further comprising a second skin layer adjacent to said core layer and on a side of said core layer opposite said first skin layer, said second skin layer comprising a polyolefin selected from the group consisting of at least one of ethylene propylene random copolymer, ethylene-propylene-butylene terpolymer, propylene-butylene copolymer, and ethylene-propylene impact copolymer.21. The metallized multilayer film of claim 17, wherein said core layer includes greater than or equal to 50 wt % of said high crystallinity polypropylene homopolymer.22. The metallized multilayer film of claim 17, wherein said core layer includes greater than or equal to 65 wt % of said high crystallinity polypropylene homopolymer.23. The metallized multilayer film of claim 17, wherein said core layer further comprises an additive selected from the group consisting of:i) an opacifying agent selected from the group consisting of iron oxide, carbon black, aluminum, TiO2, and talc, said opacifying agent being present in said core layer in an amount ranging from about 1 wt % to about 15 wt %, based on the total weight of the core layer; ii) a cavitating agent selected from the group consisting of polybutene terephthalatc, nylon, solid glass spheres, hollow glass spheres, metal beads, metal spheres, ceramic spheres, and CaCO3, said cavitating agent being present in said core layer in an amount ranging from about 1 wt % to about 20 wt %, based on the total weight of the core layer, said cavitating agent having a mean particle size in the range of from 0.1 micron to 10 microns; and iii) a hydrocarbon resin, said resin being one of petroleum resin, terpene resin, styrene resin, cyclopentadiene resin, saturated alicyclic resin, or combinations thereof, said resin has a number average molecular weight <5000, said resin has a softening point in the range of from about 60° C. to about 180° C., said resin being present in said core layer at <10 weight percent. 24. A metallized multilayer film comprising:1) a first component comprising: (a) a core layer comprising a high crystallinity polypropylene homopolymer with a xylene soluble level of 1.5% wherein said high crystallinity polypropylene homopolymer is a product of Ziegler-Natta catalysis; (b) a first skin layer adjacent to said core layer wherein said skin layer comprises a thermoplastic selected from a group consisting of ethylene vinyl alcohol copolymer, and amorphous polyamide; (c) a tie layer positioned between said core layer and said first skin layer comprising maleic anhydride modified polypropylene homopolymer or copolymer; d) a vacuum deposited aluminum layer adjacent to said first tie layer, and 2) a second component comprising a polymer selected from at least one of low density polyethylene, EVA, EMA and EAA that is extrusion laminated to said aluminum layer of said first component at a web tension sufficient to prevent metal crazing of said vacuum deposited aluminum layer. 25. The metallized multilayer film according to claim 24, wherein the shrinkage of said film in the longitudinal direction and in the transverse direction is greater than 5%.26. The metallized multilayer film according to claim 24, wherein said web-tension is up to 1 pound per linear inch on said metallized multilayer film during extrusion lamination.27. The metallized multilayer film according to claim 24, further comprising a second skin layer adjacent to amid core layer and on a side of said core layer opposite said first skin layer, said second skin layer comprising a polyolefin selected from the group consisting of ethylene-propylene random copolymer, ethylene-propylene-butylene terpolymer, propylene-butylene copolymer, and ethylene-propylene impact copolymer.28. The metallized multilayer film of claim 24, wherein said core layer further comprises an additive selected from the group consisting of:i) an opacifying agent selected from at least one of TiO2 and talc, said opacifying agent being present in said core layer in the range of from 2-4 weight percent, based on the total weight of the core layer; ii) a material selected from at least one of polybutene terephthalate and CaCo3, said material having a mean particle size in the range of from 0.1-10 μm, said material being present in said core layer in the range of from 2-10 weight %, based on the total weight of the core layer; and iii) a hydrocarbon resin, said resin being selected from at least one of petroleum resin, terpene resin, styrene resin, cyclopentadiene resin and saturated alicyclic resin, said resin having a number average molecular weight <5000, and a softening point in the range of from 60° C.-180° C., said resin being present in said core layer at <6 weight percent. 29. A metallized multilayer film comprising:(a) a yore layer comprising a high crystallinity polypropylene homopolymer with an a xylene soluble level of 1.5% or less wherein said high crystallinity polypropylene homopolymer is a product of Ziegler-Natta catalysis; (b) a first skin layer adjacent to said core layer wherein said skin layer comprises a thermoplastic selected from a group consisting of ethylene vinyl alcohol copolymer, and amorphous polyamide; (c) a tie layer adjacent to said first skin layer comprising maleic anhydride modified polypropylene homopolymer or copolymer; (d) a vacuum deposited aluminum layer adjacent to said first tie layer; and (e) a second skin layer adjacent to said core layer and on a side of said core layer opposite said first skin layer, said second skin layer comprising a polyolefin selected from the group consisting of ethylene-propylene random copolymer, ethylene-propylene-butylene terpolymer, propylene-butylene copolymer, and ethylene-propylene impact copolymer. 30. The metallized multilayer film according to claim 29, wherein the shrinkage of said film in the longitudinal direction and in the transverse direction is pester than 5%.31. The metallized multilayer film of claim 29, wherein said core layer includes greater than or equal to 50 wt % of said high crystallinity polypropylene homopolymer.32. The metallized multilayer film of claim 29, wherein said core layer includes greater then or equal to 65 wt % of said high crystallinity polypropylene homopolymer.33. The metallized multilayer film of claim 29, wherein said core layer further comprises an additive selected from the group consisting of:i) an opacifying agent selected from one of TiO2, and talc, or combinations thereof; said opacifying agent present in said core layer in the range of from 2-4 weight percent, based on the total weight of the core layer; ii) a material selected from one of polybutene terephthalate, CaCO3 or combinations thereof, said material having a mean particle size in the range of from 0.1-10 μm, said material being present in said core layer in the range of from 2-10 weight %, based on the total weight of the core layer; and iii) a hydrocarbon resin, said resin being selected from at least one of petroleum resin, terpene resin, styrene resin, cyclopentadiene resin and saturated alicyclic resin, said resin having a number average molecular weight <5000, and a softening point ranging from about 60° C. to about 180° C., said resin being present in said core layer at <6 weight percent. 34. A method of making a metallized biaxially oriented multilayer film comprising the steps of: (a) coextruding a multilayer melt of thermoplastic polymers including a core layer comprising a high crystallinity polypropylene homopolymer with a xylene soluble level of 1.5% or less wherein said high crystallinity polypropylene homopolymer is a product of Ziegler-Natta catalysis through a die; (b) cooling said multilayer melt to form a multilayer sheet; (c) stretching said multilayer sheet in the machine direction (MD) over a series of heated rollers traveling at a differential speed to form an MD oriented multilayer film; (d) stretching said MD oriented multilayer film in a heated tinter frame to form a biaxially oriented multilayer film; (e) surface treating at least one of said first skin layer and said second skin layer of said biaxially oriented multilayer film with a treatment selected from the group consisting of corona treatment, flame treatment and plasma treatment; and (f) metallizing said first akin layer in a vacuum metallizer with aluminum to form a metallized biaxially oriented multilayer film.35. The method according to claim 34, wherein the shrinkage of said film in the longitudinal direction and in the transverse direction is greater than 5%.36. The method of claim 34, which further comprises an additional step of extrusion laminating at least one of low density polyethylene, EMA, EVA, and EAA to the metallized side of said film at a web tension sufficient to prevent metal crazing of the vacuum metallized aluminum layer.