| 摘要 |
<p>PURPOSE: To improve a combination of heat-shrinkability, high oxygen permeability and elongation physical properties by a first internal layer containing an ethylene/vinyl acetate copolymer, other internal layer containing very low density polyethylene with a density of a specific value or less and two surface layers containing an ethylene/vinyl acetate copolymer. CONSTITUTION: A five-layered film consists of a core layer 1, two intermediate layers 2, 3 and two outer surface layers 4, 5. Pref., the core layer 1 is constituted of an ethylene/vinyl acetate copolymer, a blend of the ethylene/vinyl acetate copolymer and straight chain low density polyethylene or usual highly branched chain low density polyethylene. The pref. material constituting the adjacent intermediate layers 2, 3 is very low density polyethylene with a density of below about 0.900 g/cm<3> . The pref. material constituting the outer surface layers 4, 5 is an ethylene/vinyl acetate copolymer. The material constituting the outer surface layers 4, 5 is pref. same to the ethylene/vinyl acetate copolymer used in order to form the core layer 1.</p> |
