Multilayer Shrink Films, Labels Made Therefrom and Use Thereof

Abstract

A multilayer heat shrink film including a core layer including one or more alpha-olefin polymer and at least one skin layer including one or more cyclic olefin copolymers (COC), process for its preparation and uses thereof.

1 - 17 . (canceled) 
     
     
         18 . A method of making a film comprising:
 co-extruding a core layer comprising: (i) at least from 60 to 98 wt. % of at least one polymer selected from a group consisting of propylene-based elastomers, ethylene plastomers, metallocene-catalyzed linear low density polyethylenes, and blends thereof, and (ii) from 40 to 2 wt. % of at least one α-olefin polymer having a melting point higher than the at least one polymer; and at least one skin layer comprising a cyclic olefin polymer (COC).   
     
     
         19 . The method of  claim 18 , further comprising orienting the film in a machine direction. 
     
     
         20 . The method of  claim 18 , further comprising biaxially orienting the film. 
     
     
         21 . The method of  claim 18 , further comprising orienting the film in a transverse direction. 
     
     
         22 . The method of  claim 18 , further comprising biaxially orienting using a simultaneously stretching process. 
     
     
         23 . The method of  claim 18 , wherein the co-extruding comprises through a cast die. 
     
     
         24 . The method of  claim 18 , wherein the co-extruding comprises through an annular die. 
     
     
         25 . The method of  claim 18 , further comprising introducing additives to the core layer. 
     
     
         26 . The method of  claim 18 , further comprising adding one or more film forming polymer resins in the at least one skin layer and in an amount less than the COC. 
     
     
         27 . The method of  claim 26 , wherein the one or more film forming polymer resins have melting points at temperatures within a range of equal to lower than a melting point of the COC. 
     
     
         28 . The method of  claim 26 , wherein the one or more film forming polymer resins have melting points at temperatures higher than a melting point of the COC. 
     
     
         29 . The method of  claim 18 , further comprising introducing additives to the at least one skin layers. 
     
     
         30 . The method of  claim 18 , further comprising coextruding one or more tie layers in the film. 
     
     
         31 . The method of  claim 18 , further comprising corona or flame plasma treating the film. 
     
     
         32 . The method of  claim 18 , further comprising metallizing the film. 
     
     
         33 . The method of  claim 18 , further comprising applying a printable topcoat to the film. 
     
     
         34 . The method of  claim 18 , further comprising applying one or more protective coatings to the film. 
     
     
         35 . The method of  claim 18 , further comprising cooling the film subsequent to the coextruding and prior to stretching the film. 
     
     
         36 . The method of  claim 18 , further comprising, subsequent to the extruding, solvent-seaming one or more welded tubes of the film to produce one or more sleeves. 
     
     
         37 . The method of  claim 36 , further comprising cutting at least one of the one or more sleeves to produce a label.