US 11,753,493 B2
Amphiphilic block polymers soluble in strongly saline medium
David James Wilson, Coye-la-Florêt (FR); Mikel Morvan, Pessac (FR); Max Chabert, Ivry-sur-Seine (FR); and Arnaud Cadix, Saint-Ouen (FR)
Assigned to ENERGY SOLUTIONS (US) LLC, Princeton, NJ (US)
Filed by ENERGY SOLUTIONS (US) LLC, Princeton, NJ (US)
Filed on Sep. 15, 2020, as Appl. No. 17/21,205.
Application 17/021,205 is a continuation of application No. 15/770,352, granted, now 10,808,064, previously published as PCT/EP2016/075329, filed on Oct. 21, 2016.
Claims priority of application No. 15 60435 (FR), filed on Oct. 30, 2015.
Prior Publication US 2020/0407480 A1, Dec. 31, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 293/00 (2006.01); C08F 212/08 (2006.01); C09K 8/588 (2006.01); C09K 8/68 (2006.01); C08F 220/18 (2006.01)
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.