Hybrid perfume microcapsules

Patent metadata

Field	Value
Publication number	US-9963661-B2
Application number	US-201515322155-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jun 27, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

The present invention relates to organic-inorganic hybrid core-shell microcapsules encapsulating an active ingredient such as a perfume and having a shell made from the hydrolysis and condensation reaction of particular polyalkoxysilane macro-monomeric compositions.

First claim

What is claimed is:

1. A polyalkoxysilane macro-monomeric composition obtainable by reacting at least one compound of formula

wherein NCO is an isocyanate group, R represents a CH 3 or a CH 2 —CH 3 group; Q represents a hydrogen, a CH 3 or a CH 2 —CH 3 group and p is an integer comprised between 1 and 5;
with at least two different polyamines comprising each at least two amino groups.

2. A polyalkoxysilane macro-monomeric composition according to claim 1 , wherein the molar ratio of isocyanate group(s) from the at least one compound of formula (i) relative to the amino groups from the at least two polyamines is comprised between 0.8 and 2.

3. A polyalkoxysilane macro-monomeric composition according to claim 1 wherein at least one compound of formula (i) is selected from the group consisting of 3(triethoxysilyl)propyl isocyanate and 3(trimethoxysilyl)propyl isocyanate.

4. A polyalkoxysilane macro-monomeric composition according to claim 1 wherein at least two different polyamines each comprise two amino groups.

5. A polyalkoxysilane macro-monomeric composition according claim 1 wherein at least two different polyamines each comprise more than two amino groups.

6. A polyalkoxysilane macro-monomeric composition according to claim 4 wherein the at least two different polyamines are selected from the group consisting of 1,2-diaminopropane, 1,2-diaminocyclohexane, ethylenediamine, isobutylenediamine, and N,N′-dimethyl-1-2-diaminocyclohexane.

7. A process for the preparation of organic-inorganic core-shell microcapsules, said process including the following steps:
a) Dissolving a polyalkoxysilane macro-monomeric composition as defined in claim 1 into an active ingredient to form an oil phase;
b) Preparing an aqueous phase by dissolving an emulsifier or a colloidal stabilizer in water, at pH above 8;
c) Dispersing under high shearing the oil phase into the aqueous phase; and
d) Keeping the resulting emulsion at pH above 8 and temperature higher than 60° C. to form hybrid microcapsules.

8. A process according to claim 7 for the preparation of organic-inorganic core-shell microcapsules comprising a fragrance-based core, said process including the following steps:
a) Dissolving a polyalkoxysilane macro-monomeric composition as defined in claim 1 into a perfume to form an oil phase;
b) Preparing an aqueous phase by dissolving an emulsifier or a colloidal stabilizer in water, at pH above 8;
c) Dispersing under high shearing the oil phase into the aqueous phase; and
d) Keeping the resulting emulsion at pH above 8 and temperature higher than 60° C., to form hybrid microcapsules.

9. A process according to claim 7 wherein the polyalkoxysilane macro-monomeric composition represents from 1 to 50% of the oil phase.

10. A process according to claim 7 wherein the colloidal stabilizer is a cationic polymer.

11. Organic-inorganic core-shell microcapsules obtainable by a process as defined in claim 7 wherein said microcapsules comprise a fragrance-based core and a shell resulting from the hydrolysis and condensation reaction of the polyalkoxysilane macro-monomeric composition.

12. A liquid aqueous composition comprising microcapsules as defined in claim 11 , together with a cationic polymer.

13. A perfuming composition or a perfumed consumer product comprising microcapsules as defined in claim 11 .

14. A consumer product according to claim 13 , in the form of a home- or personal-care product.

15. A consumer product according to claim 14 , in the form of a shower gel, a hair care product, an antiperspirant or a deodorant.

16. A perfuming composition or a perfumed consumer product comprising a liquid composition as defined in claim 12 .

17. A consumer product according to claim 16 , in the form of a home- or personal-care product.

18. A consumer product according to claim 17 , in the form of a shower gel, a hair care product, an antiperspirant or a deodorant.

Assignees

• Firmenich & Cie

Inventors

• Ouali Lahoussine
• Jacquemond Marlène
• Erni Philipp

Classifications

• C11D11/0064

  Chemistry & Metallurgy · mapped topic

• C11D3/3738

  Alkoxylated silicones · CPC title

• C11D3/505 Primary

  encapsulated or adsorbed on a carrier, e.g. zeolite or clay · CPC title

• C11D17/0039

  Coated compositions or coated components in the compositions, (micro)capsules · CPC title

• C11D3/3726

  Polyurethanes · CPC title