| 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=CR<1>R<2> (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 Cp2LnR<6> (II) and organometallic compound(s) of formula Met(R<9>)3 (IIIA), (R<9>AlO)n (IIIB), (R<9>AlO)nAl(R<9>)2 (IIIC) and/or Zn(R<9>)2 (IIID), in a molar excess of more than 4:1 based on (II). R<1> = H or 1-20C alkyl; R<2> = CSR<3> or COR<3>; R<3> = OR<4>, SR<4> or NR<4>R<5>; R<4>, R<5> = 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; R<6> = amide ligand with a silicon atom; Met = aluminum or boron; R<9> = 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 <1>H-NMR analysis of the alpha -methyl groups.
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