Self-immobilized titanium and zirconium catalysts with phenoxy-imine ligands for ethylene polymerization. X-ray crystal structure of bis(N-(3-tert-butylsalicylidene)-4′-allyloxyanilinato) zirconium (IV) dichloride Original Research Article

Four self-immobilized FI catalysts with allyl substituted phenoxy-imine ligands [{4-(CH2CHCH2O)C6H5NCHC6H3(3-tert-C4H9)O}2MCl2] (1: M=Ti; 2: M=Zr), [{3-(CH2CHCH2O)C6H5NCHC6H3(3-tert-C4H9)O}2MCl2] (3: M=Zr), [{4-(CH2CHCH2-2,6-(iso-C3H7)2)C6H5NCHC6H3(3,5-(NO2)2)O}2MCl2] (4: M=Zr) have been synthesized and characterized. The molecular structure of 2 has been determined by X-ray crystallographic analysis. The results of ethylene polymerization showed that the self-immobilized titanium (IV) and zirconium (IV) catalysts 1–3 kept high activity for ethylene polymerization and 4 showed no activity. SEM showed the immobilization effect could greatly improve the morphology of polymer particles to afford micron-granula polyolefin as supported catalysts.