Films having enhanced sealing characteristics and packages containing same
AssigneeCryovac, Inc.
InventorsThomas Kennedy, Gordon Sharps, Richard Watson
Life of this patent
Estimating the term…
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.
Claims26
1-15. (canceled)
A package comprising a seal of a first outer film layer to a second outer film layer, the first outer film layer comprising a composition comprising:
- (A) a first component comprising at least one member selected from the group consisting of 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, carboxyl-modified polyethylene;
- and
- wherein the first component is chemically different from the second component, and the second outer film layer comprising at least one member selected from the group consisting of ionomer, ethylene/acid copolymer, and ethylene/acrylate copolymer.
19-39. (canceled)
A package comprising a seal of a first region of a first outer film layer to a second region of a second outer film layer, wherein the first outer film layer comprises a homogeneous ethylene/alpha-olefin copolymer, and the second outer film layer comprises at least one member selected from the group consisting of ionomer, ethylene/acid copolymer, carboxyl-modified polyethylene, wherein the seal has a strength of at least 2 lb/in.
A multilayer film comprising:
- (A) an outer layer comprising:
- (i) a first component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (ii) 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, and carboxyl-modified polyethylene;
- (B) a second layer, the second layer being an oxygen-barrier layer;
- (C) a third layer, the third layer being a tie layer between the second layer and the first layer;
- (D) a fourth layer, the third layer being a thermoforming, abuse, and ultraviolet-protection layer between the second layer and the third layer;
- (E) a fifth layer, the fifth layer being a thermoforming, abuse, and heat-resistant outer layer;
- (F) a sixth layer, the sixth layer being a thermoforming, abuse, and ultraviolet-protection layer between the fifth layer and the second layer;
- (G) a seventh layer, the seventh layer being a tie layer between the fifth layer and the sixth layer.
(canceled)
(canceled)
A multilayer film comprising:
- (A) a first layer, the first layer being an outer sealant layer, the outer sealant layer comprising a first composition, the first composition comprising:
- (i) a first component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (ii) 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, and carboxyl-modified polyethylene;
- and
- (B) a second layer, the second layer comprising a second composition, the second composition comprising:
- (iii) a third component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (iv) a fourth 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 composition is different from the second composition.
A multilayer film, comprising:
- (A) a first layer, the first layer being a seal-assist layer, the seal-assist layer comprising a first composition, the first composition comprising:
- (i) a first component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (ii) a second component comprising at least one member selected from the group consisting of elastomer, homogeneous ethylene/allpha-olefin copolymer having a density of from about 0.86 to 0.91 g/cc, ionomer, and carboxyl-modified polyethylene;
- and
- (B) a second layer, the second layer being an outer sealant layer, the outer sealant layer comprising at least one member selected from the group consisting of ionomer, ethylene/acid copolymer, and carboxyl-modified polyethylene.
A multilayer film, comprising:
- (A) a first layer, the first layer being an outer sealant layer as well as a food-contact layer, the first layer comprising at least one member selected from the group consisting of ionomer, ethylene/acid copolymer, and carboxyl-modified polyethylene;
- (B) a second layer, the second layer being an outer layer as well as being a non-food-contact layer;
- (C) a third layer, the third layer being a seal-assist layer, the third layer being between the first layer and the second layer, the third layer comprising a first composition, the first composition comprising:
- (i) a first component comprising at least one member selected from the group consisting of polyethylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/vinyl acetate copolymer, and ethylene/acrylate copolymer;
- and
- (ii) 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;
- (D) a fourth layer, the fourth layer being a memory layer, the fourth layer being between the second layer and the third layer;
- (E) a fifth layer, the fifth layer being a tie layer, the fifth layer being between the third layer and the fourth layer;
- and
- (F) a sixth layer, the sixth layer being a tie layer, the sixth layer being between the second layer and the fourth layer.
Dependencies are inferred from the claim text.