Patent ID: 7182998
Filing Date: 2007-02-27
Classification: B32B,C08J,C08K,Y10S,Y10T

Abstract:
1. A cross-linked heat shrinkable laminate film where the laminate film comprises at least 3 layers composed of outer layers and an inner layer, two outer layers and an inner layer comprise an ethylene polymer resin having a density of 0.900-0.934 g/cm 3 , and said ethylene polymer resin is at least one member selected from the group consisting of (i) intermediate density polyethylene; (ii) low density polyethylene; (iii) ethylene-α-olefin copolymer comprising linear low density polyethylene and/or ultra-low density polyethylene; and (iv) mixtures thereof, and the outer layers comprise one member selected from the group consisting of an ethylene-α-olefin copolymer, a low density polyethylene and mixtures thereof, the laminate film has a gel fraction of 5-40% and contains a glycerin fatty acid ester surface active agent in an amount of 2.0-8.0% by weight based on the total weight of the ethylene polymer resin, and said surface active agent is present in an amount of 3.0-20.0 mg/m 2 on at least one surface of the film, and the heat shrinkage of the film at 120° C. is 50-80% in both the machine direction and the transverse direction and the transverse direction, and the heat shrinkage stress of the film at 120° C. is 1.2-2.2 N/mm 2 in both the machine direction and the transverse direction.