CPC C08F 293/005 (2013.01) [C09K 8/588 (2013.01); C09K 8/68 (2013.01); C08F 212/08 (2013.01); C08F 220/1812 (2020.02); C08F 2438/03 (2013.01)] | 14 Claims |
1. A method comprising regulating rheology of a liquid medium comprising more than 50 g/l of salt by dissolving in the liquid medium a polymer composition comprising a polymer, wherein the polymer is a block copolymer prepared by a process comprising a step (E) of micellar radical polymerization in which the following are placed in contact, in an aqueous medium (M):
hydrophilic monomers, dissolved or dispersed in said aqueous medium (M);
hydrophobic monomers in the form of a micellar solution containing, in dispersed form in the aqueous medium (M), micelles comprising these hydrophobic monomers;
at least one radical polymerization initiator, and
optionally, at least one radical polymerization control agent,
wherein said micelles comprise at least one surfactant of amphoteric nature; and
wherein the polymer composition comprises at least one surfactant of amphoteric nature from the micellar free radical polymerization.
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