Patent ID: 7538167

Claim:
A process of producing syndiotactic polypropylene comprising: providing a metallocene catalyst component characterized by the formula: wherein: Ar is a C 6 to C 40 aromatic group; R 1 and R 2 are each independently a hydrogen, a C 1 -C 30 alkyl group, a cycloalkyl group, an aryl group or combinations thereof; E is a —C— group or an —Si— group; M is titanium, zirconium or hafnium; and Q is chlorine, a methyl group, a phenyl group, a substituted phenyl, a substituted benzyl group or combinations thereof; providing a cocatalyst component; contacting said metallocene catalyst component and said cocatalyst component in a polymerization reaction zone with propylene under slurry or gas phase polymerization conditions to produce said syndiotactic polypropylene polymer; and recovering said syndiotactic polypropylene from said reaction zone, wherein the syndiotactic polypropylene has a melting temperature of greater than 160° C. and a percentage of syndiotactic pentads greater than 95%.