Patent ID: 6921734

Claim:
A catalyst for preparing syndiotactic polystyrene comprising a titanocene complex I and an alkylaluminoxane II: R 1 Ti(OR 2 R 3 ) 3 I wherein R 1 is Cp or Cp containing 1-5 C 1-4 alkyls; R 2 is an aryl containing 6-12 carbon atoms; R 3 is a halogen; OR 2 R 3 is a halogenated aryloxy ligand; R 4 is an alkyl containing 1-4 carbon atoms; n is the oligomerization degree of the alkylaluminoxane II, the value of which is 6-40; and the mole ratio of aluminum in alkylaluminoxane II to the titanocene complex I is 50-2000.