Polymerization process or controlled radical copolymerization of (meth) acrylic and vinyl and (co) polymers obtained

This method is characterized in that it is polymerized or copolymerized in bulk, solution, emulsion or suspension at a temperature range down to 0 deg.C, at least one of said monomers in the presence of a system boot comprising: at least one compound generating radicals other than bromofluorene; and at least one catalyst consisting of a palladium complex in the oxidation state 0, represented by the following formula (I): Pd (O) L ** ** 1L 2L 3L ** ** 4 wherein L 1 ** , L ** 2, L 3 and L ** 4 ** are identical or different, each represent a ligand which may be a chiral ligand, which is selected from PRR'R ", P (oR) (oR ') (0R "), NRR'R", ORR ', SRR', SERR 'AsRR'R "SbRR'R" where each R, R', R "is independently a C1 -C14, optionally substituted, or an optionally substituted aromatic group, at least two of these ligands may be interconnected by one or more divalent radicals.