PROCESS FOR PREPARING MICROCAPSULES

• US 20200129947A1
• Filed: 06/27/2018
• Published: 04/30/2020
• Est. Priority Date: 06/27/2017
• Status: Active Grant

• Current Assignee: Firmenich SA (DSM-Firmenich AG)
• Original Assignee: Firmenich SA (DSM-Firmenich AG)
• Inventors: OUALI, Lahoussine, JACQUEMOND, Marlene
• Granted Patent: US 11,291,969 B2
• Time in Patent Office: Days
• CPC Class Codes: A61K 2800/10 General cosmetic use
• CPC Class Codes: A61K 2800/805 Corresponding aspects not provided for by any of codes A61K2800/81 - A61K2800/95
• CPC Class Codes: A61K 8/11 Encapsulated compositions
• CPC Class Codes: A61K 8/85 Polyesters
• CPC Class Codes: A61K 8/86 Polyethers
• CPC Class Codes: A61K 8/87 Polyurethanes
• CPC Class Codes: A61K 8/88 Polyamides
• CPC Class Codes: A61K 8/891 saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• CPC Class Codes: A61Q 13/00 Formulations or additives for perfume preparations essential oils or perfumes per se C11B9/00
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations
• CPC Class Codes: B01J 13/16 Interfacial polymerisation
• CPC Class Codes: B01J 13/20 After-treatment of capsule walls, e.g. hardening
• CPC Class Codes: B01J 13/22 Coating
• CPC Class Codes: C11D 17/0008 aqueous liquid non soap compositions C11D3/0015, C11D3/3947, C11D3/3956 take precedence
• CPC Class Codes: C11D 17/06 Powder; Flakes; Free-flowing mixtures; Sheets
• CPC Class Codes: C11D 3/3707 Polyethers, e.g. polyalkyleneoxides
• CPC Class Codes: C11D 3/3715 Polyesters or polycarbonates
• CPC Class Codes: C11D 3/3738 Alkoxylated silicones
• CPC Class Codes: C11D 3/505 encapsulated or adsorbed on a carrier, e.g. zeolite or clay

Abstract

Described herein is a process for preparing microcapsules. More particularly, the process is characterized by the fact that it requires limited amounts of water for preparing microcapsules. Microcapsules obtainable by the disclosed process as well as consumer products including those microcapsules are also described.

Claims

1. Process for preparing a microcapsule slurry, said process comprising the steps of:

(i) dissolving a monomer in an oil phase comprising a hydrophobic active ingredient;

(ii) preparing a dispersing phase comprising an emulsifier, wherein the dispersing phase is not miscible with the oil phase;

(iii) adding the oil phase to the dispersing phase to form a two-phases dispersion; and

(iv) applying conditions sufficient to induce interfacial polymerization and form core-shell microcapsules in form of a slurry;

wherein the monomer is susceptible to react during the interfacial polymerisation to form the microcapsules in form of a slurry;

said process being characterized in that a content of water in the dispersing phase is below or equal to 10% by weight based on a total weight of the dispersing phase.

2. The process according to claim 1, wherein the content of water in the dispersing phase is below or equal to 5% by weight based on the total weight of the dispersing phase.

3. The process according to claim 2, wherein the dispersing phase does not comprise water.

4. The process according to claim 1, wherein the dispersing phase is hydrophilic.

5. The process according to claim 1, wherein the dispersing phase comprises nucleophiles groups.

6. The process according to claim 1, wherein the dispersing phase comprises a solvent chosen from the group consisting of glycerol,1,4-butanediol, ethylene glycol and mixtures thereof.

7. The process according to claim 1, wherein the monomer in the oil phase is chosen from the group consisting of at least one polyisocyanate, poly maleic anhydride, poly acyl chloride, polyepoxide, acrylate monomers and polyalkoxysilane.

8. The process according to claim 1, wherein the dispersing phase comprises a polyamine.

9. The process according to claim 1, wherein the dispersing phase comprises a polyol.

10. The process according to claim 1, wherein the emulsifier is chosen from the group consisting of gum Arabic, lignin sulfonate, soy protein, sodium caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, Pseudocollagen, Biopolymer SA-N, Pentacare-NA PF, co-polymers of acrylamide and acrylic acid, acrylic co-polymers bearing a sulfonate group, anionic polyvinyl alcohol, cationic polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl alcohol, co-polymers of vinyl ethers and maleic anhydride, modified polyvinyl alcohol, modified starch, modified cellulose, polysaccharides and mixtures thereof.

11. A microcapsule slurry obtainable by the process as defined in claim 1, wherein the slurry comprises below or equal to 10% by weight of water based on a total weight of the slurry.

12. A perfuming composition comprising:

(i) a microcapsule slurry as defined in claim 11, wherein the hydrophobic active ingredient comprises a perfume;

(ii) at least one ingredient selected from the group consisting of a perfumery carrier and a perfuming co-ingredient; and

(iii) optionally a perfumery adjuvant.

13. A liquid consumer product comprising:

a) from 2 to 65% by weight, relative to a total weight of the liquid consumer product, of at least one surfactant;

b) water or a water-miscible hydrophilic organic solvent; and

c) a microcapsule slurry as defined in claim 11.

14. A powder consumer product comprising:

a) from 2 to 65% by weight, relative to a total weight of the powder consumer product, of at least one surfactant; and

b) a microcapsule slurry as defined in claim 11.

15. A liquid consumer product according to claim 13 in the form of an anhydrous liquid consumer product.

16. The process according to claim 1, wherein the hydrophobic active ingredient comprises a perfume.

17. The process according to claim 8, wherein the dispersing phase comprises a polyamine chosen from the group consisting of guanidine salts, tris-(2-aminoethyl)amine, N,N,N′

,N′

-tetrakis(3-aminopropyl)-1,4-butanediamine, guanazole, aminoacids such as lysine, aminoalcohol such as 2-amino-1,3-propanediol, ethanolamine and mixtures thereof.

18. The microcapsule slurry obtainable by the process as defined claim 11, wherein the slurry comprises below or equal to 5% by weight of water based on the total weight of the slurry.

19. The microcapsule slurry obtainable by the process as defined in claim 18, wherein the slurry comprises below or equal to 3% by weight of water based on the total weight of the slurry.

20. The liquid consumer product according to claim 13, wherein the liquid consumer product is in the form of a laundry care product, a home care product, a body care product, a skin care product, an air care product, or a hygiene product