Method for encapsulating oils in an aqueous medium with hase polymer emulsions, products obtained, and uses thereof
AssigneeCoatex
InventorsJean Moro, David Platel, Jean-Marc Suau, Olivier Guerret
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Abstract
The invention consists of a method for manufacturing an aqueous formulation containing at least one oil, and comprising the steps of mixing at least one associative polymer, one oil, and water, encapsulating the oil by increasing the pH to a value greater than 8, potentially precipitating the mixture by reducing the pH to a value less than 6, and potentially isolating the resulting particles by removing the water. The aqueous formulations, as with the aqueous dispersions, and the resulting solid particles constitute other objects of the invention.
Claims16
A method for producing an aqueous formulation comprising at least one oil, the method comprising:
- a) mixing at least one associative polymer comprising, in polymerized form:
- at least one (meth)acrylic acid monomer;
- at least one (meth)acrylic ester monomer;
- and
- at least one associative hydrophobic monomer,
- with the at least one oil and water, to get a mixture, in proportions such that the at least one oil is at least 4% based on total weight of the mixture,
- b) adjusting a pH of the mixture in a) to a value greater than 6;
- c) precipitating the mixture after b) by adjusting the pH to a value less than 6, to obtain a dispersion in water of constituent particles of the at least one associative polymer and of the at least one oil;
- and
- d) optionally, isolating the constituent particles obtained after c) by removing the water.
A dispersion of at least one particle in water, wherein said at least one particle comprises:
- at least one oil;
- and
- at least one associative hydrophobic polymer comprising, in polymerized form:
- at least one (meth)acrylic acid monomer;
- at least one (meth)acrylic ester monomer;
- and
- at least one associative hydrophobic monomer, and wherein the dispersion has a pH less than 6,
- and comprises at least 4% by weight of the at least one oil, in relation to its total weight.
Dependencies are inferred from the claim text.