Ethylenic polymer and its use

Abstract

New ethylene polymers having low levels of long chain branching are disclosed. Films and film layers made form these polymers have good hot tack strength over a wide range of temperatures, making them good materials for packaging applications.

1 . An ethylenic polymer having: an overall polymer density of not more than 0.905 g/cm 3 ; a GI200 gel rating of not more than 15; 110/12 (measured at 190° C.) from about 5.8 to about 6.5, preferably from about 5.9 to about 6.5; a zero shear viscosity (ZSV) ratio of from about 1.3 to about 2.3, preferably from about 1.4 to about 2.2, most preferably from about 1.5 to about 2.1; and Mw/Mn of from about 2.0 to about 2.4, preferably from about 2.1 to about 2.3; and a g′(HMW)/g′(LMW) of greater than 0.95. 
     
     
         2 . The ethylenic polymer of  claim 1  further comprising a have melt index (190° C., 2.16 kg load) from about 0.5 to about 15 gms/10 minutes, preferably from about 0.7 to about 12. 
     
     
         3 . The ethylenic polymer of  claim 1  further comprising a DSC melting point defined by the relationship,
     Tm (° C.)≦(−7914.1*(density)2)+(15301*density)−7262.4, where density is in g/cc.
 
 
     
     
         4 . The ethylenic polymer of  claim 1  wherein the density is from about 0.857 g/cc to 0.905 g/cc, preferably from about 0.865 g/cc to 0.905 g/cc, most preferably from about 0.885 g/cc to 0.905 g/cc. 
     
     
         5 . A composition comprising, or made from, at least one ethylenic polymer of  claim 1 , wherein at least a portion of the ethylenic polymer has been cross-linked. 
     
     
         6 . A composition comprising, or made from, at least one ethylenic polymer of  claim 1 , in which at least a portion of the ethylenic polymer has been functionalized. 
     
     
         7 . A composition comprising, or made from, at least one ethylenic polymer of  claim 1  and at least one other natural or synthetic polymer. 
     
     
         8 . The composition of  claim 11  in which at least one of the other natural or synthetic polymer(s) is selected from the group consisting of at least one thermoplastic or elastomeric olefin polymer and at least one styrenic block copolymer. 
     
     
         9 . A composition comprising, or made from, at least one ethylenic polymer of  claim 1  and at least one other component selected from the group consisting of a tackifier, a wax, and an oil. 
     
     
         10 . A composition comprising a dispersion or emulsion of particles in a fluid, wherein the particles comprise, or are made from, at least one ethylenic polymer of  claim 1 . 
     
     
         11 . A fabricated article in which at least one layer or portion of the fabricated article comprises, or is made from, at least one ethylenic polymer of  claim 1 . 
     
     
         12 . The fabricated article of  claim 10  in which the fabricated article comprises a film, a sheet, a fiber, a nonwoven, a laminate, or a composite. 
     
     
         13 . The fabricated article of  claim 11  in which the article is a multilayer film and the layer of the film that comprises, or is made from, the at least one ethylenic polymer has a peak hot tack in (N/inch) is greater than or equal to the quantity (13−0.395*12) at a seal bar temperature of from 90 to 140 C.