Claims
- 1. An oriented sealable film comprising:(a) an inner layer comprising an olefin polymer which comprises polypropylene, high density polyethylene or ethylene-propylene copolymer or terpolymer, wherein the polypropylene comprises greater than about 80 wt % of isotactic polypropylene or greater than about 80 wt % of syndiotactic polypropylene, wherein the percentages are based on the entire weight of the polypropylene of the inner layer; (b) a sealing layer selected from the group consisting of ethylene-propylene random copolymer, ethylene-butene-1 copolymer, ethylene-propylene-butene-1 terpolymer, propylene-butene copolymer, low density polyethylene, linear low density polyethylene, very low density polyethylene, metallocene catalyzed polyethylene plastomer, metallocene catalyzed polyethylene, metallocene catalyzed ethylene-hexene copolymer, metallocene catalyzed ethylene-butene copolymer, metallocene catalyzed ethylene-octene copolymer, ethylene-methacrylate copolymer, ethylene-vinyl acetate copolymer and ionomer resin; and (c) a separable layer positioned between the inner layer and the sealing layer, the separable layer comprising a blend of (i) ethylene-propylene block copolymer and (ii) metallocene catalyzed ethylene-α-olefin copolymer, wherein the α-olefin is C3-C8 olefin.
- 2. An oriented sealable film comprising:(a) an inner layer comprising an olefin polymer which comprises polypropylene, high density polyethylene or ethylene-propylene copolymer or terpolymer, wherein the polypropylene comprises greater than about 80 wt % of isotactic polypropylene or greater than about 80 wt % of syndiotactic polypropylene, wherein the percentages are based on the entire weight of the polypropylene of the inner layer; (b) a sealing layer selected from the group consisting of ethylene-propylene random copolymer, ethylene-butene-1 copolymer, ethylene-propylene-butene-1 terpolymer, propylene-butene copolymer, low density polyethylene, linear low density polyethylene, very low density polyethylene, metallocene catalyzed polyethylene plastomer, metallocene catalyzed polyethylene, metallocene catalyzed ethylene-hexene copolymer, metallocene catalyzed ethylene-butene copolymer, metallocene catalyzed ethylene-octene copolymer, ethylene-methacrylate copolymer, ethylene-vinyl acetate copolymer and ionomer resin; and (c) a separable layer positioned between the inner layer and the sealing layer, the separable layer comprising a blend of (i) ethylene-propylene block copolymer and (ii) ultra low density polyethylene.
- 3. An oriented sealable film comprising:(a) an inner layer comprising an olefin polymer which comprises polypropylene, high density polyethylene or ethylene-propylene copolymer or terpolymer, wherein the polypropylene comprises greater than about 80 wt % of isotactic polypropylene or greater than about 80 wt % of syndiotactic polypropylene, wherein the percentages are based on the entire weight of the polypropylene of the inner layer; (b) a sealing layer selected from the group consisting of ethylene-propylene random copolymer, ethylene-butene-1 copolymer, ethylene-propylene-butene-1 terpolymer, propylene-butene copolymer, low density polyethylene, linear low density polyethylene, very low density polyethylene, metallocene catalyzed polyethylene plastomer, metallocene catalyzed polyethylene, metallocene catalyzed ethylene-hexene copolymer, metallocene catalyzed ethylene-butene copolymer, metallocene catalyzed ethylene-octene copolymer, ethylene-methacrylate copolymer, ethylene-vinyl acetate copolymer and ionomer resin; and (c) a separable layer positioned between the inner layer and the sealing layer, the separable layer comprising a blend of (i) propylene homopolymer and (ii) metallocene catalyzed polyethylene.
- 4. The oriented sealable film according claim 1 or claim 2, wherein the ethylene-propylene block copolymer comprises from about 3 to about 25 wt % of ethylene based on the entire weight of the block copolymer.
- 5. The oriented sealable film according to any one of claims 1, 2, or 3, wherein the separable layer constitutes at least about 20% of the entire thickness of the film.
- 6. The oriented sealable film according to any one of claims 1, 2, or 3, wherein one or more of the layers of the film further comprises a finely divided inorganic material selected from the group consisting of synthetic amorphous silica, diatomaceous earth, and clay.
- 7. The oriented sealable film according to any one of claims 1, 2, or 3, wherein one or more of the layers of the film further comprises a crosslinked hydrocarbyl substituted polysiloxane.
RELATED APPLICATION
This application is continuation of U.S. application Ser. No. 08/788,551, which was filed on Jan. 24, 1997, now U.S. Pat. No. 6,231,975 B1.
US Referenced Citations (22)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9604178 |
Feb 1996 |
WO |
Non-Patent Literature Citations (1)
Entry |
Encyclopedia of Polymer Science and Engineering, vol. 6, p. 385, (1985). |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/788551 |
Jan 1997 |
US |
Child |
09/727225 |
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US |