Preparation of amphiphilic block polymers by controlled radical micellar polymerisation

摘要

The present invention relates to the preparation of block copolymers, which can be used in particular as rheology agents, suitable, inter alia, for oil extraction, comprising a step of radical micellar polymerization wherein the following are brought into contact in an aqueous medium: —hydrophilic monomers, dissolved or dispersed in the aqueous medium; —hydrophobic monomers in the form of a micellar solution, i.e. containing, in a dispersed state, micelles comprising these hydrophobic monomers; —at least one radical polymerization initiator; and —at least one radical polymerization control agent. The polymers obtained according to the invention can be used in particular for enhanced oil recovery (EOR).

主权项

1. A process for preparing a block copolymer, which comprises 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, i.e. containing, in dispersed form in the medium (M), micelles comprising these hydrophobic monomers; at least one radical polymerization initiator, and at least one radical polymerization control agent, in which the radical polymerization control agent is a compound comprising a thiocarbonylthio group —S(C═S)—.