Modifiers for Oriented Polypropylene

Abstract

A biaxially oriented film that comprises polypropylene and either polytrimethylene terephthalate or polymethylpentene as a cavitating agent in an amount from 5 wt % to 25 wt %. The film has a haze of from 90% to 100% and a gloss of from 10 to 150. The film may be used in food packaging applications and in industrial applications.

1 - 20 . (canceled) 
     
     
         21 . A composition comprising polypropylene and a cavitating agent selected from the group consisting of polymethylpentene (PMP) and polytrimethylene terephthalate (PTT). 
     
     
         22 . The composition of  claim 21  wherein the cavitating agent is present in an amount from about 5 wt % to about 25 wt %. 
     
     
         23 . The composition of  claim 22  wherein the cavitating agent is present in an amount from about 10 wt % to about 15 wt % 
     
     
         24 . The composition of  claim 21 , wherein the polypropylene is atactic polypropylene, isotactic polypropylene, hemi-isotactic polypropylene, or syndiotactic polypropylene. 
     
     
         25 . The composition of  claim 24  wherein the polypropylene is an isotactic homopolymer. 
     
     
         26 . The composition of  claim 24  wherein the polypropylene is a random isotactic polypropylene co-polymer. 
     
     
         27 . The composition of  claim 26  wherein the polypropylene co-polymer comprises ethylene. 
     
     
         28 . The composition of  claim 21  wherein melt flow of the polypropylene as determined by ASTM D-1238 at 230° C. and 2160 g is from 1.0 to 6.0 g/10 min. 
     
     
         29 . The composition of  claim 21  wherein the melting point of the polypropylene as determined by Differential Scanning calorimetry (DSC) is from 145° C. to 175° C. 
     
     
         30 . The composition of  claim 21  wherein the xylene solubles (weight %) of the polypropylene is less than 7.0 wt % as measured in accordance with ASTM D 5492-98. 
     
     
         31 . The composition of  claim 21  wherein the xylene solubles (weight %) of the polypropylene is less than 1.0 wt % as measured in accordance with ASTM D 5492-98.