초록 ▼

A multilayer, heat-shrinkable food packaging film useful for forming a post packaging pasteurization bag. The film includes at least three layers: 1) a first outer layer formed from a resin composition having a Vicat softening point of at least 100.degree. C., 2) a second outer layer having one or m

A multilayer, heat-shrinkable food packaging film useful for forming a post packaging pasteurization bag. The film includes at least three layers: 1) a first outer layer formed from a resin composition having a Vicat softening point of at least 100.degree. C., 2) a second outer layer having one or more thermoplastic gloss materials of polyester, ethylene/alpha-olefin copolymer having a melt index of greater than 1 g/10 minutes, styrene/butadiene block copolymer, and ethylene/styrene random copolymer, and 3) one or more inner layers between the first and second outer layers. At least one of the inner layers includes an ethylene/alpha-olefin copolymer. The film has a total free shrink of at least 40% at 85.degree. C. If the second outer layer includes polyester, then each of the inner layers of the multilayer film is devoid of a weight amount of polyamide or polyester greater than the weight amount of polyester in the second outer layer. The second outer layer may include sufficient thermoplastic gloss material to impart a gloss of greater than 60%. The film may also include an oxygen barrier internal layer. A post pasteurization bag made from the inventive film provides the appearance and shrink characteristics comparable to those of a barrier bag film yet can form heat seals that withstand the abuse and heat associated with post pasteurization.

대표청구항 ▼

1. A multilayer heat-shrinkable film comprising:a first outer layer formed from a resin composition having a Vicat softening point of at least 100.degree. C.; a second outer layer including one or more thermoplastic gloss materials selected from the group consisting of polyester, ethylene/alpha-olef

1. A multilayer heat-shrinkable film comprising:a first outer layer formed from a resin composition having a Vicat softening point of at least 100.degree. C.; a second outer layer including one or more thermoplastic gloss materials selected from the group consisting of polyester, ethylene/alpha-olefin copolymer having a melt index of greater than 1 g/10 minutes, styrene/butadiene block copolymer, and ethylene/styrene random copolymer; and one or more inner layers between the first and second outer layers, at least one of the inner layers including an ethylene/.alpha.-olefin copolymer, wherein: the multilayer film has a total free shrink of at least 40% at 85.degree. C.; and if the second outer layer includes a given amount by weight of polyester, then: i) each of the inner layers of the multilayer film is devoid of an amount by weight of polyamide greater than the given amount by weight of polyester in the second outer layer and ii) each of the inner layers of the multilayer film is devoid of an amount by weight of polyester greater than the given amount by weight of polyester in the second outer layer.