Process for producing crystalline vinyl aromatic polymers...

C - Chemistry – Metallurgy – 08 – F

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C08F 12/00 (2006.01) C08F 4/64 (2006.01) C08F 12/04 (2006.01)

Patent

CA 1311580

A B S T R A C T A process for the production of mainly 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 transition metal compound (M) different from titanium and containing at least a bond M-O, M-C, M-N, M-P, M-S and M-halogen, and b) an organoaluminium compound containing at least an oxygen atom bound to tha aluminium atom or between two aluminium atoms. Compounds a) and b) can be used as such or carried.

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