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Amphiphilic multiblock polymers

  • US 10,450,397 B2
  • Filed: 03/16/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 03/24/2014
  • Status: Active Grant
First Claim
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1. A process for preparing a polymer, the process comprising a polymerization step (E) in which the following are placed in contact in an aqueous medium (M) containing dispersed surfactant micelles:

  • ethylenically unsaturated monomers M1 predominantly present in the aqueous medium, referred to as “

    hydrophilic monomers”

    ;

    ethylenically unsaturated monomers M2 different from the hydrophilic monomers, at least partly present in the surfactant micelles, and having a solubility in the aqueous medium (M) at the implementation temperature of step (E) at least equal to that of hexyl acrylate, referred to as “

    partially water-soluble hydrophobic monomers”

    ;

    at least one radical polymerization initiator; and

    at least one radical polymerization control agent;

    thereby preparing a polymer having a mass of greater than 100 000 g/mol and less than 300 000 g/mol; and

    ,after step (E), a step (E2) of grafting an ethylenically unsaturated group onto the polymer as obtained on conclusion of step (E), whereby a polymer bearing an ethylenically unsaturated function is obtained.

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