Amphiphilic multiblock polymers
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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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.
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Citations
14 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
and/or is not capable of penetrating into the micelles of the micellar solution.
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9. The process as claimed in claim 1, wherein the hydrophilic monomers of step (E) are (meth)acrylic acid monomers or acrylamido or methacrylamido monomers.
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10. The process as claimed in claim 1, wherein the hydrophilic monomers of step (E) are 2-acryloylamino-2-methylpropane-1-sulfonic acids (AMPS) or acrylamide or acrylic acid.
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11. The process according to claim 1, wherein the at least one radical polymerization initiator is water-soluble or water-dispersible.
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12. A polymer with a mass of greater than 100 000 g/mol and less than 300 000 g/mol obtained according to the process of claim 1.
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13. A method
for modifying a liquid/liquid, liquid/solid or liquid/gas interface; -
for regulating the rheology of a liquid medium; and
/orfor dispersing organic or mineral pigments comprising using the polymer as claimed in claim 12.
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14. A method for radical polymerization comprising using the polymer as claimed in claim 12 as an ethylenically unsaturated monomer.
Specification