Production of acrylic polymers involves polymerisation of acrylic monomers in presence of catalyst based on rare earth metal-cyclopentadiene-silylamido complex and organometallic compound

摘要

A method for the production of acrylic (co)polymers involves polymerisation of acrylic monomers in non-polar solvent in presence of a catalyst prepared in situ from a rare earth metal-cyclopentadiene-silylamido complex and an organometallic compound of boron, aluminum or zinc. A method for the production of acrylic (co)polymers involves the polymerisation of monomers of formula H2C=CR1R2 (I) in a non-polar solvent at a temperature between -100 deg C and the boiling point of the solvent, in the presence of a catalyst which is prepared in situ from a rare earth metal(III) organometallic complex of formula Cp2LnR6 (II) and organometallic compound(s) of formula Met(R9)3 (IIIA), (R9AlO)n (IIIB), (R9AlO)nAl(R9)2 (IIIC) and/or Zn(R9)2 (IIID), in a molar excess of more than 4:1 based on (II). R1 = H or 1-20C alkyl; R2 = CSR3 or COR3; R3 = OR4, SR4 or NR4R5; R4, R5 = 1-20C alkyl, cycloalkyl or aryl (all optionally containing C-C double or triple bonds, tert. amino, carboxyalkyl, carboxycarbonylalkyl, N,N-dialkyl-amido, N-aryl-N-alkyl-amido, keto, epoxide, ether, acetal, sulfonyl, sulfinyl, thioether, tert. phosphine, alkyldialkoxysilyl, dialkylphosphonate and/or trialkylphoshate groups); Cp = optionally substituted cyclopentadienyl; Ln = rare earth metal in the oxidation state +3; R6 = amide ligand with a silicon atom; Met = aluminum or boron; R9 = alkyl, cycloalkyl or aryl; n = 1 or more. An Independent claim is also included for (co)polymers obtained by this method, showing a syndiotacticity of more than 40% based on 1H-NMR analysis of the alpha -methyl groups.