| 摘要 |
The present invention discloses a process for the preparation of crystalline vinylaromatic polymers having an essentially syndiotactic structure, said process comprising polymerizing vinylaromatic monomers, alone or mixed with at least another monomer in the presence of a catalyst system essentially consisting of A) a titanium or zirconium complex selected from those having general formula MR1R2R3R3, A1MR1R2R3, A1A2MR1R2; B) a catalyst selected from an alkylaluminoxane and a boron compound having the formula (II): BX1X2X3 or one of their salts; C) a tin derivative having the general formula: SnR5R6R7R8.
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