Catalyst system used in gas phase polymerization of conjugated dienes

摘要

A catalyst system comprises (A) a rare earth alcoholate, carboxylate, diketone complex and/or halide adduct with an oxygen or nitrogen donor compound, (B) an aluminum trialkyl and/or dialkylaluminum hydride and/or alumoxane, (C) another Lewis acid and (D) an inert, particulate, (in)organic solid, and also a cocatalyst on an (in)organic carrier. A catalyst system comprises (A) a rare earth alcoholate (RO)3M (I), carboxylate (R-CO2)3M (II), diketone complex (R-CO-CH-CO-R)3M (III) and/or halide adduct MX3.y Donor (IV) with an oxygen (O) or nitrogen (N) donor compound, (B) an aluminum trialkyl and/or dialkylaluminum hydride Al(H)xR<1>)3-x (V) and/or alumoxane R<1>-(A(R<1>)-O)nAl(R<1>)2 (VI) or (VII), (C) another Lewis acid and (D) an inert, particulate, (in)organic solid with a BET specific surface area greater than 10 m<2>/g and a pore volume of 0.3-15 ml/g and also, if carbon black is used, a dibutyl phthalate (DBP) adsorption of 10-300 ml/100 g; and also a cocatalyst on an (in)organic carrier; R = 1-20 C alkyl; M = a trivalent rare earth element with atomic number 57-71; X = chlorine, bromine or iodine; x = 0 or 1; y = 1-6; n = 1-50; R<1> = 1-10 C alkyl. Independent claims are also included for (a) the use of carrier materials coated with cocatalysts in the gas phase polymerization of conjugated dienes; and (b) particles with a core of polybutadiene or polyisoprene and a shell of carrier coated with cocatalyst.