Factors affecting the product distributions in ethylene/styrene copolymerizations catalyzed by Cp à TiCl 2 (O-2,6-i Pr 2 C 6 H 3 ) are explored in the presence of various cocatalysts at high styrene/ ethylene feed ratios (at 40 and 55 8C). Ethylene/styrene copolymers were the sole product when the reactions were conducted in the presence of [PhN(H)Me 2 ][B(C 6 F 5 ) 4 ] and Al i Bu 3 /Al(octyl) 3 even at 55 and 70 8C, whereas syndiotactic polystyrene was by-produced when the polymerizations were performed at >40 8C in the presence of MAO; the ratios of the copolymer/SPS were affected by the reaction temperature as well as Al cocatalyst employed.
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