PERFUME MICROENCAPSULATION

Abstract

According to the invention, a core-shell microcapsule is provided comprising a cross-linked polymeric shell encapsulating a perfume-containing core, wherein the cross-linked polymeric shell is the reaction product of a functionalized polysiloxane, a polyisocyanate and a polyamine and wherein the functionalized polysiloxane comprises a polysiloxane backbone, one or more ethoxylated alcohol side chains and one or more substituted or unsubstituted alkyl or aliphatic cycloalkyl side chains.

Claims

1. A core-shell microcapsule comprising a cross-linked polymeric shell encapsulating a perfume-containing core, wherein the cross-linked polymeric shell is the reaction product of a functionalized polysiloxane, a polyisocyanate and a polyamine and wherein the functionalized polysiloxane comprises a polysiloxane backbone, one or more ethoxylated alcohol side chains and one or more substituted or unsubstituted alkyl or aliphatic cycloalkyl side chains.

2. The core-shell microcapsule of claim 1, wherein the functionalized polysiloxane has Structure I: ##STR00004## where: R1 is a substituted or unsubstituted alkyl or is a substituted or unsubstituted aliphatic cycloalkyl group having from 1 to 20 carbon atoms; a is from 1 to 25; and m+n+o is 100; m+o is from 10 to 30; and n is from 70 to 90.

3. The core-shell microcapsule of claim 2, wherein in Structure I: R1 is a straight chain C16 alkyl group; a is 10; n is 75; m+o is 25.

4. The core-shell microcapsule of claim 1 wherein the polyisocyanate is selected from the group consisting of an aromatic polyisocyanate, an aliphatic polyisocyanate and mixtures thereof.

5. The core-shell microcapsule of claim 1, wherein the polyisocyanate is selected from the group consisting of isophorone diisocyante, toluene diisocyante, hexamethylene diisocyanate, toluene triisocyante, 1,4-phenylene diisocyanate, 1,3-phenylene diisocyanate, m-xylylene diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, poly(hexamethylene diisocyanate), trans-1,4-cyclohexylene diisocyanate, poly(propylene glycol) terminated with tolylene 2,4-diisocyanate, tolylene diisocyanate, 1,4-diisocyanatobutane, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,8-diisocyanatooctane, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, 4,4′-Methylenebis(phenyl isocyanate) and mixtures thereof.

6. The core-shell microcapsule of claim 1, wherein the polyisocyanate comprises isophorone diisocyanate.

7. The core-shell microcapsule of claim 1, wherein the polyamine is selected from the group consisting of diethylenetriamine, bis(hexamethylene)triamine, triamine tetraacetate, melamine-(triamine-15N3), bis(hexamethylene)triamine, (3-trimethoxy silyl propyl) diethylenetriamine, N-cyclopropyl-2,4,6-triamino-1,3,5-triazine, melamine-13C3, N(2),N(4),N(6)-tris(2-phenylethyl)-1,3,5-triazine-2,4,6-triamine, N(2),N(4),N(6)-tris(4-chlorophenyl)-1,3,5-triazine-2,4,6-triamine, N,N′-di-tert-butyl-N″, N,N-dimethyl-1,3,5-triazine-2,4,6-triamine and mixtures thereof.

8. The core-shell microcapsule of claim 1, wherein the polyamine comprises diethylenetriamine.

9. The core-shell microcapsule of claim 1, having a diameter of 0.1 to 100 micrometers.

10. An aqueous dispersion or emulsion comprising at least one core-shell microcapsule of claim 1.

11. A personal care or fabric care product comprising at least one core-shell microcapsule of claim 1.

12. A method of making an aqueous dispersion of core-shell microcapsules comprising a cross-linked polymeric shell encapsulating a perfume-containing core, the method comprising the steps of: a. Forming a disperse phase comprising a perfume and a polyisocyanate; b. Forming an aqueous continuous phase; c. Combining the disperse phase with the aqueous continuous phase and mixing to form a emulsion of the dispersed phase in the aqueous continuous phase; d. Adding a functionalized polysiloxane to the emulsion and mixing, wherein the functionalized polysiloxane comprises a polysiloxane backbone, at least one ethoxylated alcohol side chain and one or more substituted or unsubstituted alkyl or aliphatic cycloalkyl side chains; and e. Adding a polyamine to the mixture and mixing to form core-shell microcapsules dispersed in the aqueous continuous phase.

13. The method of claim 12 comprising adding a material selected from the group consisting of an emulsifier, a catalyst, a rheology modifier, and mixtures thereof in b. or c.

14. The method of claim 12, wherein mixing in d. is performed for 1-4 hours.

15. The method of claim 12, wherein the mixing in e. is for 1-5 hours.

16. The method of claim 12, wherein the functionalized polysiloxane has Structure I: ##STR00005## where: R1 is a substituted or unsubstituted alkyl or is a substituted or unsubstituted aliphatic cycloalkyl group having from 1 to 20 carbon atoms; a is from 1 to 25; m+n+o is 100; m+o is from 10 to 30; and n is from 70 to 90.

17. The method of claim 16, wherein in Structure I: R1 is a straight chain C16 alkyl group; a is 10; n is 75; m+o is 25.

18. The method of claim 12, wherein the polyisocyanate is selected from the group consisting of isophorone diisocyante, toluene diisocyante, hexamethylene diisocyanate, toluene triisocyante, 1,4-phenylene diisocyanate, 1,3-phenylene diisocyanate, m-xylylene diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, poly(hexamethylene diisocyanate), trans-1,4-cyclohexylene diisocyanate, poly(propylene glycol) terminated with tolylene 2,4-diisocyanate, tolylene diisocyanate, 1,4-diisocyanatobutane, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,8-diisocyanatooctane, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, 4,4′-Methylenebis(phenyl isocyanate) and mixtures thereof.

19. The method of claim 12, wherein the polyisocyanate comprises isophorone diisocyanate.

20. The method of claim 12, wherein the polyamine is selected from the group consisting of diethylenetriamine, bis(hexamethylene)triamine, triamine tetraacetate, melamine-(triamine-15N3), bis(hexamethylene)triamine, (3-trimethoxy silyl propyl) diethylenetriamine, N-cyclopropyl-2,4,6-triamino-1,3,5-triazine, melamine-13C3, N(2),N(4),N(6)-tris(2-phenylethyl)-1,3,5-triazine-2,4,6-triamine, N(2),N(4),N(6)-tris(4-chlorophenyl)-1,3,5-triazine-2,4,6-triamine, N,N′-di-tert-butyl-N″, N,N-dimethyl-1,3,5-triazine-2,4,6-triamine and mixtures thereof.

21. The method of claim 12, wherein the polyamine comprises diethylenetriamine.

Description

PRODUCT EXAMPLES

[0091] Fabric Softener Formulation

TABLE-US-00004 Ingredient Function wt % Praepagen TQ Cationic 8 (Triethanolamine Esterquat).sup.1 softener Distilled water Carrier up to 100 Colour [Sanolin Blue AE90].sup.1 Color 3 Encapsulated fragrance 0.3-10% according to the invention Perlogen 3000 (glycol distearate, Sheen & 1 laureth-4, cocamidopropyl betaine).sup.1 shine Genapol LT (PEG-150 Liquid 0.5 polyglyceryl-2 thickener tristearate, laureth-3 and dipropylene glycol).sup.1 .sup.1Available from Clariant.

[0092] Hair Shampoo Formulation

TABLE-US-00005 Ingredient Function wt % Cocoamide DEA or MEA Thickener  5-10 Alcohol ethoxy glyceryl sulfonate Surfactant  2-25 Sodium or ammonium lauryl sulfate Surfactant  5-20 Cocoamidopropyl betaine Foaming  0-20 agent Polysorbates (Tween 20, 40, 60) Solubilizer 0-5 Encapsulated fragrance 0.3-10  according to the invention