Heat-resistant polyolefin compositions suitable for films

Abstract

Compositions are provided that comprise: (1) a polymer selected from the group consisting of: (A) an ethylene/α-olefin multiblock interpolymer; (B) a propylene based plastomer or elastomer; and (C) a mixture of (A) and (B); (2) from about 1 to about 75 weight percent filler based on the weight of the composition; and (3) an effective amount of tackifier.

1 . A composition suitable for a fabricated article comprising:
 (1) a polymer selected from the group consisting of:
 (A) an ethylene/α-olefin multiblock interpolymer; 
   (B) a propylene based plastomer or elastomer; and   (C) a mixture of (A) and (B);   (2) from 1 to 75 weight percent filler based on the weight of the composition; and   (3) an effective amount of at least one tackifier.   
     
     
         2 . The composition of  claim 1  wherein the composition has a Tg as measured by DSC of 0° C. to 40° C. 
     
     
         3 . The composition of  claim 1  wherein the polymer is an ethylene/α-olefin multiblock interpolymer which is characterized by a Mw/Mn from 1.7 to 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship:
   T m >−6553.3+13735(d)-7051.7(d) 2 .
 
 
     
     
         4 . The composition of  claim 3  wherein the ethylene/α-olefin multiblock interpolymer is an ethylene-octene interpolymer comprising at least 50 mole percent ethylene. 
     
     
         5 . The composition of  claim 1  wherein the polymer is a propylene based plastomer or elastomer which is a propylene-ethylene interpolymer comprising at least 80 mole percent propylene. 
     
     
         6 . The composition of  claim 1  wherein the weight ratio of tackifier to polymer is from 0.1 to 4. 
     
     
         7 . The composition of  claim 1  wherein the filler comprises from 40 to 75 weight percent of the composition based on the total weight of the composition. 
     
     
         8 . The composition of  claim 1  wherein the tackifier has a Ring and Ball Softening Point of from 100 to 160° C. 
     
     
         10 . The composition of  claim 1  wherein the tackifier has a glass transition temperature of from 40 to 95° C. 
     
     
         11 . The composition of  claim 1  wherein the tackifier has a density of from 0.5 to 1.5 g/cm 3 . 
     
     
         12 . The composition of  claim 1  which further comprises low density polyethylene.