Multiblock amphiphilic polymers
AssigneeRhodia Operations
InventorsSimon HARRISSON, James WILSON
Life of this patent
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Abstract
The present invention relates to a process for preparing a polymer with a mass Mw of less than 300 000 g/mol (especially between 1000 and 300 000 g/mol), comprising a step (E) of controlled radical polymerization in which the following are placed in contact in an aqueous medium in which are dispersed surfactant micelles: ethylenically unsaturated hydrophilic monomers predominantly present in the aqueous medium; partially water-soluble ethylenically unsaturated hydrophobic monomers different from the preceding monomers, at least partly present in the surfactant micelles, and having a solubility in the aqueous medium at least equal to that of hexyl acrylate; at least one radical polymerization initiator; and at least one radical polymerization control agent.
Claims20
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.
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Dependencies are inferred from the claim text.