Patent ID: 6815023
Filing Date: 2004-11-09
Classification: B29C,B32B,B65D,C08J,C08L,Y10S,Y10T

Abstract:
A flexible, biaxially stretched, heat shrinkable polymeric film having at least one layer comprising a blend of at least three copolymers comprising:20 to 85 weight percent of a first polymer having a melting point of 80 to 98Â° C. comprising at least one copolymer of ethylene and hexene-1; 5 to 35 weight percent of a second polymer having a melting point of 115 to 128Â° C. comprising at least one copolymer of ethylene and at least one &agr;-olefin; and 10 to 50 weight percent of a third polymer having a melting point of 60 to 110Â° C. comprising at least one copolymer of ethylene and a vinyl ester, an alkyl acrylate, acrylic acid, or methacrylic acid; wherein said first and second polymers have a combined weight percentage of at least 50 weight percent, said weight percentage being based upon the total weight of said first, second and third polymers; and wherein said film has a maximum ram puncture force of at least 70 Newtons, a ram puncture stress of at least 110 MPa, and a tear propagation strength â€œxâ€  such that 10&lE;x&lE;40 grams per mil in each of the machine and transverse directions or x<25 grams per mil in at least one of the machine and transverse directions.