The invention relates to a copolymer including betaininc units and
hydrophobic and/or amphiphile units. The invention also relates to a
method for preparing a copolymer including betaininc units and
hydrophobic and/or amphiphile units, by controlled micellar
polymerisation. The invention further relates to the uses of the
copolymer. The copolymer is particularly used for increasing the
viscosity of saline aqueous compositions.