Patent ID: 6558809
Filing Date: 2003-05-06
Classification: B32B,C08J,Y10T

Abstract:
A halogen-free, high frequency sealable multilayer film comprising at least:(a) a polar layer having a dielectric loss factor of at least 0.10 comprising a blend of polar and non-polar polymers wherein the polar polymer is an ethylene copolymer with carbon monoxide (CO) selected from a group of consisting of ethylene-vinyl acetate-carbon monoxide and ethylene-n-butyl acrylate-carbon monoxide terpolymers; wherein the CO comprises at least 3 percent by weight of the polar layer; (b) a layer comprising a non-polar olefin homopolymer or non-polar olefin copolymer, and (c) a surface bonding or adhesive layer; wherein, (a) is between (b) and (c) and accounts for at least 20% of the film gauge when said multilayer film has a thickness less than 10 mils (250 micrometers); wherein said multilayer film has an interlayer adhesion strength of at least four pounds per inch (0.7 Newton per millimeter); and wherein two plies of the multilayer film have a seal strength of at least one pound per inch (0.18 Newton per millimeter) when sealed in a bonding layer-to-bonding layer orientation using a 1.5 kilowatt Callanan radio frequency sealer operating at 27.1 megahertz and 0.5 second seal time.