Patent ID: 6818714
Filing Date: 2004-11-16
Classification: B01J,C07F,C08F

Abstract:
A catalytic system for the polymerization of at least one olefin in a diluting medium in the presence of the catalytic system, the catalytic system being formed in situ from:(A) at least one ligand selected from the group consisting of: a ligand represented by formula (Ia): where R represents a 5,6-bicyclo[2.2.1]hept-2-ene radical; â€”(CH2)4;â€” or â€”(CH2)8â€”; a ligand represented by formula (Ib): wherein R represents a 5,6bicyclo[2.2.2]-hept-2-ene radical or â€”(CH2)8â€”; a ligand represented by formula (Ic): where 1,1â€²-Fc represents a-1,1â€²-ferrocenylene radical; a ligand represented by formula (Idâ€²): where R represents a pheny radical of the formula 1,4-C6H4; and a ligand represented by formula (I)â€²: â€ƒwhere: E and Eâ€² each represent independently an oxygen or a sulfur atom; X and Xâ€² each represent independently a phosphorus, arsenic or antimony atom; the radicals R1 and Râ€²1, which are identical or different, are selected from the group consisting of: branched or cyclic alkyl radicals; arylalkyl radicals; alkylaryl radicals; halogens; hydroxyl radical; and alkoxide radicals; the R2, Râ€²2, R3, Râ€²3, R4 and Râ€²4 radicals, which are identical or different, are selected from the group consisting of linear, branched or cyclic alkyl radicals; and R is a divalent radical; and (B) at least one nickel compound selected from: (B1) nickel complexes with a zero oxidation state, which are represented by the general formula (II): where Ra and Rb each represent independently a hydrogen atom, or a linear, branched or cyclic alkyl radical or aryl, arylalkyl or alkylaryl radical, which have up to 8 carbon atoms, it being also possible for Ra and Rb to form together a divalent aliphatic group of 2 to 10 carbon atoms and have up to three olefinic double bonds as the only carbon-carbon unsaturated groups; (B2) &pgr;-allylnickels, which are represented by the formula (III): â€ƒin which: the Rc, Rd, Re, Rf and Rg radicals, which are identical or different, are selected from hydrogen, linear, branched or cyclic alkyl radicals and aryl, arylalkyl or alkylaryl radicals, having up to 8 carbon atoms; the dotted lines represent the electron delocalization on the three contiguous carbon atoms; an Rc or Rd radical may also form, with an Re or Rf or Rg radical, a divalent alkene group having from 2 to 10 carbon atoms and able to have up to three olefinic double bonds; and Z represents a halogen, an alkoxy group or an alkanoyloxy group; (B3) compounds of the bis(allyl)nickel type which are represented by the (IV): â€ƒin which: the radicals Rc to Rg, and Rcâ€² to Rgâ€², which are identical or different, are selected from hydrogen, linear, branched or cyclic alkyl radicals and aryl, arylalkyl or alkylaryl radicals having up to 8 carbon atoms; the dotted lines represent the electron delocalization on the three contiguous carbon atoms; a radical Rc or Rd also able to form, with a radical Re or Rf or Rg, a divalent alkene group having from 2 to 10 carbon atoms and able to have up to three olefinic double bonds; a radical Rcâ€² or Rdâ€² also able to form, with a radical Reâ€² or Rfâ€² or Rgâ€², a divalent alkene group having from 2 to 10 carbon atoms and able to have up to three olefinic double bonds.