Method For Preparing a Living Polymer Comprising Methacrylic and/or Methacrylate Units

A method for preparing a living polymer comprising methacrylic and/or methacrylate units comprising polymerizing, in the presence of at least one styrene monomer, one or more methacrylic and/or methacrylate monomers using:

• at least one monofunctional alkoxyamine of the formula (I):
• in which:
• R1 and R3, are identical or different, represent a linear or branched alkyl group containing a number of carbon atoms ranging from 1 to 3;
• R2 is selected from a hydrogen atom, a linear or branched alkyl group containing a number of carbon atoms ranging from 1 to 8, a phenyl group, an alkali metal or an ammonium ion;
• or
• at least one polyfunctional alkoxyamine of formula (III):
• in which:
• Z represents an aryl group or a group of formula Z1-[X—C(O)]n, in which Z1 represents a polyfunctional structure, X is an oxygen atom, a nitrogen atom bearing a carbonaceous group or a hydrogen atom, or a sulfur atom;
• and
• n is an integer greater than or equal to 2.