Stable formaldehyde-free microcapsules

Patent metadata

Field	Value
Publication number	US-9359464-B2
Application number	US-201414446644-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jun 25, 2010
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The present invention relates to water-dispersible core-shell microcapsules essentially free of formaldehyde. In particular it concerns oligomeric compositions comprising, and the microcapsules obtained from, particular reaction product between a polyamine component and a particular mixture of glyoxal and a C 4-6 2,2-dialkoxy-ethanal. The present invention comprises also the invention's core-shell microcapsules as part of a perfuming composition or of a perfuming consumer product.

First claim

What is claimed is:

1. An oligomeric composition for the preparation of core-shell microcapsules, the composition obtained by reacting together:
1) a polyamine component in the form of melamine or of a mixture of melamine and at least one C 1-4 compound comprising two NH 2 functional groups;
2) an aldehyde component in the form of a mixture of glyoxal, a C 4-6 2,2-dialkoxy-ethanal and optionally a glyoxalate, said mixture having a molar ratio glyoxal/C 4-6 2,2-dialkoxy-ethanal comprised between about 1/1 and 10/1; and
3) a protic acid catalyst;
wherein the composition provides a stable emulsion that facilitates formation of core-shell microcapsules.

2. An oligomeric composition according to claim 1 , wherein the polyamine component is a mixture of melamine and at least one C 1-4 compound comprising two NH 2 functional groups and said C 1-4 compound comprising two NH 2 functional groups is selected amongst urea, 1H-1,2,4-triazole-3,5-diamine and mixtures thereof.

3. An oligomeric composition according to claim 1 , wherein said mixture has a ratio melamine/C 1-4 compound comprising two NH 2 functional groups comprised between about 2/1 and 1/3.

4. An oligomeric composition according to claim 1 , wherein said aldehyde component has a molar ratio glyoxal/2,2-dialkoxy-ethanal comprised between about 2.2/1 and 6.5/1.

5. An oligomeric composition according to claim 1 , wherein said C 4-6 dialkoxyethanal is 2,2-dimethoxy-ethanal, 2,2-diethoxy-ethanal or mixtures thereof.

6. An oligomeric composition according to claim 1 , wherein said aldehyde component comprises a glyoxalate.

7. An oligomeric composition according to claim 1 , wherein said glyoxalate has a molar ratio glyoxal/glyoxalate of between about 4/1 and 1/1.

8. An oligomeric composition according to claim 1 , wherein the polyamine component and the aldehyde component are admixed in a ratio such that the molar ratio (total amine functional group)/(total free aldehyde functional group) is comprised between about 2/1 and 1/2.

9. An oligomeric composition according to claim 1 , wherein said protic acid catalyst is selected amongst mineral acids, C 1-6 mono or dicarboxylic acids and mixtures thereof.

10. A process for the preparation of a core-shell microcapsule from an oligomeric composition, which comprises:
preparing an oil-in-water dispersion that includes the oligomeric composition of claim 1 ;
heating the dispersion;
cooling the dispersion to obtain the core-shell microcapsule; and
optionally, drying the final dispersion to obtain a dried core-shell microcapsule.

11. The process according to claim 10 , wherein the oil is a perfume oil, and the dispersion comprises between about 10% and 50% of oil, the percentage being expressed on a w/w basis relative to the total weight of the dispersion.

12. The process according to claim 10 , wherein the dispersion comprises between about 1% and 10% of oligomeric composition, the percentage being expressed on a w/w basis relative to the total weight of the dispersion.

13. The process according to claim 10 , wherein the dispersion further comprises up to 0.5% of at least a stabilizer, and up to 2% of at least a polyol, the percentage being expressed on a w/w basis relative to the total weight of the dispersion.

14. The process according to claim 10 , wherein the C 1-4 compound comprising two NH 2 functional groups is present in the dispersion in an amount of about 5% and 100%, the percentage being expressed on a w/w basis relative to the total weight of the resin.

15. A core-shell microcapsule made from the composition of claim 1 .

16. A perfuming consumer product which comprises, as a perfuming ingredient, at least one core-shell microcapsule, as defined in claim 15 which includes a perfume oil therein; wherein the consumer product is a fabric care product, a body-care product, an air care product or a home care product.

Assignees

• Firmenich & Cie

Inventors

• Berthier Damien
• Leon Géraldine
• Paret Nicolas

Classifications

• A61K2800/56

  Compounds, absorbed onto or entrapped into a solid carrier, e.g. encapsulated perfumes, inclusion compounds, sustained release forms · CPC title

• A61Q19/10

  Washing or bathing preparations · CPC title

• A61L9/012

  characterised by being in a special form, e.g. gels, emulsions {(A61L9/048 takes precedence)} · CPC title

• C08G12/06

  Amines · CPC title

• A61Q13/00

  Formulations or additives for perfume preparations (essential oils or perfumes per se C11B9/00) · CPC title