Patent ID: 8470750

Claim:
A process of reversible addition fragmentation transfer polymerization for preparing homopolymers of acrylic acid or copolymers of acrylic acid with at least one water-soluble monomer, comprising polymerizing (1) homopolymers of acrylic acid or (2) copolymers of acrylic acid with at least one water-soluble monomer, in water, in the presence of at least one transfer agent having a chemical structure in accordance with the following formula: where R 1 designates an alkyl radical having 2 to 10 carbon atoms and/or an aromatic radical optionally substituted by an alkyl chain having 1 to 4 carbon atoms; and where M 1 and M 2 designate the hydrogen atom, aliphatic and/or cyclic primary, secondary or tertiary amines, ethanolamine, monoethylamine, diethylamine, cyclohexylamine, methylcyclohexylamine, amino methyl propanol, morpholine, ammonium cation, sodium cation, lithium cation or potassium cation, and are identical or different.