Hydrogel fragrance capsule, formulations and process for preparing the same
This invention is a hydrogel capsule with a fragrance or odorant encapsulated therein during the polymerization process. The hydrogel capsule is of use in fabric care or personal care formulations.
1. A hydrogel capsule comprising a fragrance or odorant encapsulated in one polymerized acrylic or methacrylic acid, or ester thereof, wherein the hydrogel capsule has a mean diameter in the range of 1 to 100 μm; the fragrance or odorant is encapsulated in the hydrogel capsule during polymerization of the one acrylic or methacrylic acid, or ester thereof contained in an oil phase; the oil phase by mass consists essentially of: (i) 60 to 90% of the fragrance or odorant, (ii) 10 to 15% of the one acrylic or methacrylic acid, or ester thereof, and (iii) an oil selected from the group consisting of an isoparaffinic fluid, a caprylic triglyceride, a capric triglyceride, a light mineral oil, a light mineral wax, a vegetable oil, a light vegetable wax, diethylphthalate, butylbenzoate, benzylbenzoate, an ester solvent, triacetin, and a glycol-based water-insoluble solvent and combinations thereof.
2. The hydrogel capsule of claim 1 , wherein the hydrogel capsule has a mean diameter in the range of 1 to 20 μm.
3. The hydrogel capsule of claim 1 , wherein the one acrylic or methacrylic acid, or ester thereof is a multifunctional acrylate or methacrylate.
4. The hydrogel capsule of claim 3 , wherein the multifunctional acrylate or methacrylate is ethylene glycol diacrylate, ethylene glycol dimethacrylate, poly(ethylene glycol) dimethacrylate, or 1,6-hexandiol dimethacrylate.
5. The hydrogel capsule of claim 3 , wherein the multifunctional acrylate or methacrylate is ethylene glycol dimethacrylate.
6. The hydrogel capsule of claim 3 , wherein the capsules are additionally coated with another polymeric material.
7. The hydrogel capsule of claim 6 , wherein the polymeric material is polyquaternium-6, polyvinylamine, sodium alginate, tannic acid, or a combination thereof.
8. A consumer product comprising the hydrogel capsule of claim 1 .
9. The consumer product of claim 8 , wherein said consumer product is a laundry care, personal care, therapeutic, cosmetic or cosmeceutic product.
10. The consumer product of claim 9 , wherein the personal care product is a hair shampoo, hair conditioner, hair rinse, antiperspirant deodorant, hand sanitizer, bar soap or body wash.
11. The consumer product of claim 10 , wherein the personal care product is formatted as a stick, roll-on or aerosol spray.
12. The consumer product of claim 9 , wherein the laundry care product is a rinse conditioner, liquid detergent, powder detergent or fabric refresher.
13. A method for producing a hydrogel capsule with a fragrance or odorant encapsulated therein comprising
(a) providing a aqueous phase comprising an emulsifier;
(b) providing an oil phase consisting essentially of one acrylic or methacrylic acid, or ester thereof at a level of 10 to 15% by mass, 60% to 90% of a fragrance or odorant, and an oil selected from the group consisting of an isoparaffinic fluid, a caprylic triglyceride, a capric triglyceride, a light mineral oil, a light mineral wax, a vegetable oil, a light vegetable wax, diethylphthalate, butylbenzoate, benzylbenzoate, an ester solvent, triacetin, and a glycol-based water-insoluble solvent and combinations thereof;
(c) emulsifying the aqueous phase of (a) with the oil phase of (b) to produce an emulsion;
(d) polymerizing the emulsion to produce a hydrogel capsule with a fragrance or odorant encapsulated therein; and
(e) curing the hydrogel capsule.
14. The method of claim 13 , wherein the one acrylic or methacrylic acid, or ester thereof is a multifunctional acrylate or methacrylate.
15. The method of claim 14 , wherein the multifunctional acrylate or methacrylate is ethylene glycol diacrylate, ethylene glycol dimethacrylate, poly(ethylene glycol) dimethacrylate, or 1,6-hexandiol dimethacrylate.
16. The method of claim 14 , wherein the multifunctional acrylate or methacrylate is ethylene glycol dimethacrylate.
17. The method of claim 13 , wherein the hydrogel capsule is cured at a temperature of at least 40° C.
18. The method of claim 13 , wherein the hydrogel capsule is cured at a temperature between 55 and 95° C.
19. The method of claim 13 , wherein the hydrogel capsule is cured at a temperature between 55 and 65° C.
20. The method of claim 13 , wherein the capsules are additionally coated with another polymeric material.
21. A hydrogel capsule comprising a fragrance or odorant encapsulated in one polymerized acrylic or methacrylic acid, or ester thereof, wherein the hydrogel capsule has a mean diameter in the range of 1 to 100 μm; the fragrance or odorant is encapsulated in the hydrogel capsule during polymerization of the one acrylic or methacrylic acid, or ester thereof contained in an oil phase; the oil phase by mass consists essentially of: (i) 60 to 90% of the fragrance or odorant and (ii) 10 to 15% of the one acrylic or methacrylic acid, or ester thereof.
22. The hydrogel capsule of claim 21 , wherein the one acrylic or methacrylic acid, or ester thereof is a multifunctional acrylate or methacrylate.
23. The hydrogel capsule of claim 22 , wherein the multifunctional acrylate or methacrylate is ethylene glycol diacrylate, ethylene glycol dimethacrylate, poly(ethylene glycol) dimethacrylate, or 1,6-hexandiol dimethacrylate.
24. The hydrogel capsule of claim 22 , wherein the multifunctional acrylate or methacrylate is ethylene glycol dimethacrylate.
25. The hydrogel capsule of claim 21 , wherein the capsules are additionally coated with another polymeric material.
26. A consumer product comprising the hydrogel capsule of claim 21 .
27. The consumer product of claim 26 , wherein said consumer product is a laundry care, personal care, therapeutic, cosmetic or cosmeceutic product.