Manufacturing method null of the crystal Characteristic vinyl aromatic polymer which possesses syndiotactic structure mainly

摘要

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: 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. Compounds a) and b) can be used as such or supported on a carrier.