Method for carrying out the rare earth metal-catalyzed synthesis of polyacrylates having a high isotacticity

摘要

Production of (co)polymers of alpha -alkyl acrylic monomers (I) comprises polymerizing (I) in the presence of a catalyst formed in situ from a bisindenyl rare earth metal complex (II) in an aprotic solvent at a temperature between -100[deg]C and the b.pt. of the solvent. Production of (co)polymers of alpha -alkyl acrylic monomers of formula (I) comprises polymerizing (I) in the presence of a catalyst formed in situ from a rare earth metal complex of formula [(IND)A(IND)(]LnR6 (II) in an aprotic solvent at a temperature between -100[deg] C and the b.pt. of the solvent; [Image] R11-20C alkyl; R2CSR3 or COR3; R3OR4, SR4 or NR4R5; R4, R51-20C alkyl, cycloalkyl, (1-4C)alkyl(1-4C)alkyl, alkylaryl or aryl; IND : substituted indenyl or substituted cyclopentadienyl with a fused aromatic or alicyclic ring; A : diyl group containing an element of group 13-16; Ln : tri- or divalent rare earth metal; R6hydridic or agostically interacting ligand when Ln is trivalent, or a neutral donor ligand when Ln is divalent. An independent claim is also included for a (co)polymer produced by the process and having a isotacticity of more than 40%, based on 1H-NMR analysis of alpha -methyl groups.