Core-shell microparticles comprising a polymer

Abstract

The invention relates to microparticles that are microcapsules comprising a core and a polymeric shell, the volume median size of which is between 1 µm and 100 µm. The shell of the microcapsules comprises at least one polymer comprising units corresponding to at least one monomer comprising at least one ester group.

Claims

Demands 1. Microparticles being microcapsules comprising a core and a polymeric shell, whose median volume size is between 1 pm and 100 pm, preferably between 1 and 50 pm, characterized in that: - the shell of the microcapsules comprises at least one polymer comprising at least 50% by weight relative to the total weight of the polymer of units corresponding to at least one monomer A, of formula (I): CH2=CR 1 (COO-R 2 O-[-CO-CH2-CH2-CH2-CH2-CH2-O-] x -H) (I) in which - R 1 is a hydrogen atom or a methyl group, - R 2 is a linear or C1-C6 branched alkylene group, preferably an ethylene group, and - x is a real number between 1 and 10, preferably between 1 and 3, in which: - R 1 is a hydrogen atom or a methyl group, And - x is a real number between 1 and 10, preferably between 1 and 3.

2. Microparticles according to claim 1, characterized in that the shell of the microcapsules comprises at least 50% by weight, relative to the total weight of the shell of the microcapsules, of the polymer, preferably at least 75% by weight, particularly preferably at least 90% by weight.

3. Microparticles according to any one of the preceding claims, characterized in that the polymer comprises at least 75% by weight relative to the total weight of the polymer, preferably at least 95% by weight of units corresponding to monomer A.

4. Microparticles according to any one of the preceding claims, characterized in that monomer A is at least one monomer of formula (I).

5. Microparticles according to claim 4, wherein the monomer A has the formula (VU): CH2=CH(COO-CH2-CH2-O-[-CO-CH2-CH2-CH2-CH2-CH2-CH2-O-]2-H) (VII).

6. Microparticles according to any one of the preceding claims, characterized in that the polymer comprises at least 90% by weight relative to the total weight of the polymer, preferably at least 99%, preferably at least 99.5%, of units corresponding to monomer A.

7. Microparticles according to any one of claims 1 to 5, characterized in that the polymer comprises units corresponding to a multifunctional monomer B.

8. Microparticles according to claim 7, characterized in that the multifunctional monomer is a di(meth)acrylate or a polyol-multi(meth)acrylate modified by caprolactone motifs.

9. Microparticles according to any one of claims 7 or 8, characterized in that the polymer comprises at most 5% by weight relative to the total weight of the polymer of units corresponding to the multifunctional monomer B.

10. Microparticles according to any one of claims 7 to 9, characterized in that - the microcapsule shell comprises at least 90% by weight, relative to the total weight of the microcapsule shell, of the polymer, and - the polymer comprises at least 0.1% by weight relative to the total weight of the polymer of units corresponding to monomer B.

11. Microparticles according to any one of the preceding claims, characterized in that the median volumetric size of the microparticles is between 1 pm and 20 pm.

12. Microparticles according to any one of claims 1 to 11 characterized in that they are included in a concentrated composition, comprising at least 15%, preferably at least 30%, by weight, of the microparticles, relative to the total weight of the composition, preferably at least 50% by weight.

13. Microparticles according to claim 12, characterized in that the composition is in powder form and preferably comprises at least 90% by weight relative to the total weight of the composition of microparticles.

14. Microparticles according to any one of claims 12 or 13, characterized in that the composition is in the form of a dispersion of the microparticles in an aqueous phase, and preferably comprises at least 50% by weight relative to the total weight of the composition of the microparticles.

15. Microparticles according to any one of the preceding claims, characterized in that the core comprises a so-called active compound.

16. Microparticles according to claim 15, characterized in that the so-called active compound is selected from phytosanitary compounds, perfumes, lubricants, catalysts or accelerators of chemical reactions, pigments, dyes, and flame retardants, and in that if the so-called active compound is a perfume, then the core comprises a mixture of a perfume and a core formulation medium, said mixture being different from a core composition consisting of 70% by weight of sesame oil and 30% by weight of limonene and benzyl acetate.

17. A method for preparing microparticles according to any one of the preceding claims, comprising the following steps: A) preparation of an emulsion comprising droplets comprising a hydrophobic phase comprising a monomer composition including at least monomer A and a polymerization initiator in a continuous aqueous phase, B) polymerization by activation of the polymerization initiator, in order to obtain microparticles comprising the polymer, and C) Optionally, washing and / or concentration of microparticles.

18. A method according to claim 17, characterized in that the droplets comprise a hydrophobic phase comprising a composition of monomers including at least monomer A and the initiator in which is dispersed one or more droplets of a core phase immiscible in the hydrophobic phase, or one or more solid particles.

19. A process according to claim 18, characterized in that the immiscible core phase comprises an active compound.

20. A process according to claim 19, characterized in that the so-called active compound is selected from phytosanitary compounds, perfumes, lubricants, catalysts or accelerators of chemical reactions, pigments, dyes, and flame retardants.

21. A process according to any one of claims 17 to 20, characterized in that the polymerization initiator is a photoinitiator, and in that the polymerization is activated by UV.

22. A process according to any one of claims 17 to 21, characterized in that the emulsion droplets have a median volume size of between 1 pm and 100 pm, preferably between 1 and 50 pm.

23. Use of microparticles according to any one of the preceding claims in a downstream formulation selected from phytosanitary formulations, personal care compositions, lubricating compositions, fuel compositions, compositions for the exploitation of raw material deposits, material and coating compositions, optical treatment compositions, electronic treatment compositions, textile coating compositions, adhesive compositions, thermal or acoustic insulation compositions, ink compositions for substrates, electronic ink compositions, and flexible substrate compositions.

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