Patent ID: 8202590
Filing Date: 2012-06-19
Classification: B32B,Y10T

Abstract:
1. A multilayer oriented heat shrinkable film consisting essentially of: A) a structural layer comprising a polymer selected from the group consisting of copolymers of ethylene and a C B) a heat sealing layer consisting essentially of a polymer selected from the group consisting of ethylene vinyl acetate copolymers, ethylene alkyl acrylate copolymers, ethylene alkyl methacrylate copolymers, polyethylene, and blends thereof; and C) a gas barrier layer consisting essentially of at least one ethylene vinyl alcohol copolymer, said ethylene vinyl alcohol copolymer having from about 2 to about 8 mol % 1,2 glycol structural units present in the polymer chain and said gas barrier layer being positioned between said structural layer and said heat sealing layer; and D) an adhesive layer wherein said adhesive layer comprises: characterized in that i) said multilayer film is capable of shrinking to a size that is at least 25% less than its original size on initial exposure of said film to a temperature of 85° C. for at least one minute and further characterized in that after exposure to a temperature of 85° C. for at least one minute, said film will maintain a percent shrinkage of at least 30% less than its original size in both the machine and transverse directions for a period of at least ten weeks and ii) the secant modulus of said multilayer film in either of the machine or transverse directions, is in the range of 206-268 MPa when measured in accordance with ASTM D882.