Patent ID: 6586061
Filing Date: 2003-07-01
Classification: A61J,B32B,C08L,Y10T

Abstract:
A multi-layer film, comprising at least a first layer, a second layer inside thereof, and a third layer inside the second layer;wherein the first layer comprises a polypropylene resin; and wherein the second layer comprises a polyethylene resin material, comprising (i) from 70 to 90 wt % of a lower crystalline component and (ii) from 10 to 30 wt % of a higher crystalline component and satisfying the following physical properties (B1) to (B4): (B1) in a temperature rising elution fraction elution curve of the polyethylene resin material, an elution peak temperature of the lower crystalline component is from 45 to 85Â° C.; (B2) in the temperature rising elution fraction elution curve of thc polyethylene resin material, an H/M value is 9 or more, wherein H is a peak height of the lower crystalline component and M is a height of the minimum valley between the lower crystalline component peak and the higher crystalline component peak; (B3) an area ratio of the elution peak temperature of less of the lower crystalline component is 35% or more based on the total area of the temperature rising elution fraction elution curve of the polyethylene resin material; and (B4) a melt flow rate of the polyethylene resin material is from 0.1 to 20 g/10 minutes; and wherein the third layer comprises a resin material selected from the group consisting of a) a polypropylene resin; b) a high-pressure low density polyethylene having an extrapolation melting completion temperature of melting peak, obtained by a differential scanning calorimetry (DSC), of 110Â° C. or more; and c) a copolymer of ethylene with an &agr;-olefin having from 3 to 18 carbon atoms, having a density of 0.920 g/cm3 or more.