Method of granulating soft polyolefin resin and granule thereof

Abstract

A method for granulating a flexible polyolefin resin including steps of melting a flexible polyolefin resin, and melt-kneading the resin while cooling the resin to a temperature of the melting point (Tm-D) of the resin or less.

1 . A method for granulating a flexible polyolefin resin comprising steps of: 
 melting a flexible polyolefin resin, and    melt-kneading the resin while cooling the resin to a temperature of the melting point (Tm-D) of the resin or less.    
   
   
       2 . The method according to  claim 1 , wherein the rate of cooling the resin is 5 to 300° C./min.  
   
   
       3 . The method according to  claim 1 , wherein the flexible polyolefin resin is a polymer obtained by polymerizing an α-olefin with 3 to 20 carbon atoms using a metallocene catalyst.  
   
   
       4 . The method according to  claim 1 , wherein the flexible polyolefin resin satisfies the following (1) and (2): 
 (1) the flexible polyolefin resin is a crystalline resin with a melting point (Tm-D) from 20 to 120° C., and    (2) the crystallization time of the flexible polyolefin resin is 3 minutes or more.    
   
   
       5 . The method according to  claim 1 , wherein the flexible polyolefin resin is polypropylene satisfying the following (3): 
 (3) PP isotacticity [mm] is 50 to 90 mol %.    
   
   
       6 . The method according to  claim 1 , wherein the flexible polyolefin resin is a 1-butene polymer satisfying the following (4): 
 (4) PB isotacticity ((mmmm)/(mmrr+rmmr)) is 20 or less.    
   
   
       7 . Granules of a flexible polyolefin resin granulated by the method of  claim 1.