Patent ID: 7473473

Claim:
A coextruded three layer solid state oriented heat shrinkable film consisting essentially of: a) an internal layer comprising a styrene/butadiene/styrene block copolymer, the internal layer comprising a first surface and a second surface; and b) a first and second outer layer each comprising an olefinic polymer, wherein the olefinic polymer is selected from the group consisting of ethylene/alpha olefin copolymer, ethylene/alkyl acrylate copolymer, ethylene/acrylic acid copolymer, butylene homopolymer and butylene copolymer, multicomponent ethylene/aipha-olefin interpenetrating network resin, high density polyethylene, a blend of high density polyethylene and ethylene/vinyl acetate copolymer, and a blend of high density polyethylene and low density polyethylene; wherein the film has: i) a free shrink (ASTM D 2732) of from 40% to 80% at 240° F in at least one of the longitudinal and transverse directions; and ii) an Elmendorf tear (ASTM D 1922-03) of from 70 grams/mil to 300 grams/mil in at least one of the longitudinal and transverse directions; wherein the first outer layer is directly adhered to the first surface of the internal layer; wherein the second outer layer is directly adhered to the second surface of the internal layer; and wherein the internal layer comprising a styrene/butadiene/styrene block copolymer comprises from 1% to 15% of the total film thickness.