Films having enhanced sealing characteristics and packages containing same
AssigneeCryovac, Inc.
InventorsThomas Duane Kennedy, Gordon Vincent Sharps, Jr., Richard Keith Watson
Life of this patent
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Abstract
Films containing a sealant layer composition comprising: (1) polyethylene homopolymer, and ethylene/alpha-olefin copolymer, ethylene vinyl acetate copolymer, and ethylene/acrylate copolymer; and (2) elastomer, plastomer, ionomer, and carboxyl-modified polyethylene; when sealed to another outer film layer comprising at least one member selected from the group consisting of ionomer, ethylene/acid copolymer, ethylene/vinyl acetate copolymer and ethylene/acrylate copolymer, have been discovered to provide a seal strength comparable to an ionomer to ionomer seal.
Claims24
A multilayer film comprising:
- an outer sealant layer comprising at least one member selected from the group consisting of ionomer, carboxyl-modified polyethylene, and ethylene/acid copolymer, the outer layer having a thickness of from about 1 percent to 20 percent, based on a total thickness of the multilayer film;
- a core seal-assist layer comprising a composition comprising:
- (A) a first component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-ofefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (B) a second component comprising at least one member selected from the group consisting of elastomer, homogeneous ethylene/alpha-olefin copolymer having a density of from about 0.86 to 0.91 g/cc, ionomer, and carboxyl-modified polyethylene;
- wherein the first component is chemically different from the second component, and wherein the outer sealant layer has a thickness of from about 1 to 20 percent, based on the total thickness of the multilayer film, and the core seal-assist layer has a thickness of from about 10 to 95 percent, based on the total thickness of the multilayer film.
Dependencies are inferred from the claim text.