Patent ID: 7776242

Claim:
A method for granulating a flexible polyolefin resin comprising: polymerizing an α-olefin having 3 to 20 carbon atoms with a metallocene catalyst to form a flexible polypropylene resin; melting the resin by volatilization after polymerization; cooling the resin to the melting point of the resin (Tm-D) ±50° C., wherein the melting point of the resin (Tm-D) is the peaktop of the peak observed on the highest temperature side of a fusion endothermic curve obtained by heating 10 mg of a sample at a rate of 10° C./min after being retained at 10° C. for 5 minutes in a nitrogen atmosphere measured with a differential scanning calorimeter; and granulating the cooled resin by an underwater granulation method wherein the underwater granulation method uses cooling water of 30° C. or less to which an antifusion agent is added, wherein the polypropylene has the following properties: (1) a melting point (Tm-D) of 20 to 120° C., (2) a crystallization time of 3 minutes or more, and (3) a PP isotacticity [mm] of 50 to 90 mol%.