| abstract |
A process for the production of predominantly syndiotactic vinyl aromatic polymers by polymerizing or copolymerizing vinyl aromatic monomers such as styrene or styrene derivatives in the presence of a catalyst system comprising the product of the reaction between:n a) a compound of transition metal (M) containing at least one M-O, M-C, M-N, M-P, M-S or M-halogen bond, and b) an organoaluminium compound containing at least one oxygen atom bound to the aluminium atom or located between two aluminium atoms. n Compounds a) and b) can be used as such or supported on a carrier. |