Easy peel film structures
View Patent ↗The present invention relates to sealant films comprising a first sealant layer which readily and easily delaminates or peels from a second adjacent film layer. The first sealant layer and the second adjacent layer of the sealant film of the present invention comprise propylene or ethylene moieties wherein the propylene or ethylene moieties may be homopolymers or copolymers. The film structures of the present invention can be used independently, or laminated to a second film structure wherein the second film structure may comprise a single layer or multiple layers. The sealant films of the present invention can be heat sealed to a packaging component, such as a tray either as a single film structure or as a laminate comprising a second film structure. The sealant film structures of the present invention are particularly useful as retortable lidstock.
1. A package comprising a tray and a sealant film comprising a first sealant layer and a second adjacent layer wherein said second adjacent layer is in direct contact with said first sealant layer and wherein the first sealant layer comprises a polymer or polymer blend wherein the polymer is independently selected from the group consisting of polyethylenes (PE), ethylene vinyl acetate copolymer (EVA), polypropylenes (PP), propylene ethylene copolymers (PPE), ethylene normal butyl acrylate copolymer (ENBA), ethylene methyl acrylic acid copolymer (EMAA), ethylene acrylic acid (EAA) and ethylene methylacrylate (EMA) and the second adjacent layer comprises a blend of the same polymer or polymer blend as is present in the first sealant layer and ethylene-butene-1-copolymer, and wherein delamination occurs between the first sealant layer and the second adjacent layer.
2. The package of claim 1 wherein the second adjacent layer of the sealant film comprises a blend of two or more polymers wherein the polymers are independently selected from the group consisting of polyethylenes (PE), ethylene vinyl acetate copolymer (EVA), polypropylenes (PP), propylene ethylene copolymers (PPE), ethylene normal butyl acrylate copolymer (ENBA), ethylene methyl acrylic acid copolymer (EMAA), ethylene acrylic acid (EAA), and ethylene methyl acrylate (EMA).