Carrier system for fragrances

Patent metadata

Field	Value
Publication number	US-9422505-B2
Application number	US-201314010693-A
Country	US
Kind code	B2
Filing date	Aug 27, 2013
Priority date	Aug 28, 2012
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

The present invention relates to a carrier system for fragrances, to the production thereof and to the use of the carrier system in laundry and cosmetic formulations.
Accordingly, the present invention is directed to a microcapsule comprising a core of hydrophobic material composed of at least one fragrance or perfume and a microcapsule shell obtainable by the suspension polymerization of the following monomers:
(a) one or more C 1 -C 24 -alkyl ester(s) of (meth)acrylic acid (monomer A), (b) one or more bi- or polyfunctional monomers (monomer B) and (c) optionally, one or more other ethylenically unsaturated monomers (monomer C), wherein the shear rate for the preparation of the emulsion lies in the range of from 150 to 500 rpm and the stirring time for the preparation of the emulsion lies in the range of from 15 min to 180 min.

First claim

The invention claimed is:

1. A microcapsule comprising a core of hydrophobic material comprising at least one fragrance and a microcapsule shell obtainable by the suspension polymerization of the following monomers;
(a) one or more C 1 -C 24 -alkyl ester of (meth)acrylic acid (monomer A),
(b) one or more bi- or polyfunctional monomer (monomer B) and
(c) optionally, one or more other ethylenically unsaturated monomer (monomer C),
wherein an emulsion is prepared with a shear rate for the preparation of the emulsion in the range of from 150 to 500 rpm, and with a stirring time for the preparation of the emulsion in the range of from 15 min to 180 min, using an anchor-type stirring blade or a MIG-stirrer, wherein the microcapsule has a mean diameter in the range from 25 to 50 μm.

2. The microcapsule of claim 1 , wherein the shear rate for the preparation of the emulsion is in the range of from 150 to 350 rpm.

3. The microcapsule of claim 1 , wherein the stirring time for the preparation of the emulsion is in the range of from 20 min to 40 min.

4. The microcapsule of claim 1 , wherein said microcapsule has a mean diameter in the range from 30 to 45 μm.

5. The microcapsule of claim 1 , wherein said microcapsule consists essentially of the following monomers in copolymerized form:
(a) from 20 to 60% by weight of said monomer A,
(b) from 20 to 60% by weight of said monomer B, and
(c) from 0 to 60% by weight of said monomer C.

6. The microcapsule of claim 1 , wherein said microcapsule consists essentially of the following monomers in copolymerized form:
(a) from 25 to 45% by weight of said monomer A,
(b) from 25 to 45% by weight of said monomer B, and
(c) from 30 to 50% by weight of said monomer C.

7. The microcapsule of claim 1 , wherein said monomer A is methyl methacrylate.

8. The microcapsule of claim 1 , wherein said monomer B is 1,4-butanediol diacrylate, pentaerythrityl triacrylate, ethylene glycol dimethacrylate, pentaerythrityl tetraacrylate, or mixtures thereof.

9. The microcapsule of claim 1 , wherein said monomer C is methacrylic acid.

10. A fabric and home care composition containing the microcapsule of claim 1 , said fabric and home care composition selected from the group consisting of solid and liquid laundry detergent compositions and liquid fabric softeners and conditioners.

11. A cosmetic formulation containing the microcapsule of claim 1 .

12. The cosmetic formulation of claim 11 , wherein the cosmetic formulation is a shampoo or a hair conditioning formulation.

13. A laundry or cosmetic formulation comprising the microcapsule of claim 1 , wherein the laundry or cosmetic formulation has a percentage of fragrance leakage, measured by the “fragrance leakage test”, of less than 10% by weight.

14. The microcapsule of claim 5 , having a fragrance leakage of less than 10% by weight as measured by capillary gas chromatography.

15. The microcapsule of claim 5 , wherein said monomer A is methyl methacrylate, and monomer B is selected from 1,4-butanediol diacrylate, pentaerythrityl triacrylate, ethylene glycol dimethacrylate, pentaerythrityl tetraacrylate, or mixtures thereof.

16. The microcapsule of claim 15 , having a fragrance leakage of less than 10% by weight as measured by capillary as chromatography.

17. The microcapsule of claim 1 , wherein said microcapsule has a mean diameter in the range from 25.3 to 46.4 μm, and a fragrance leakage in the range of 1.4% to 8% by weight as measured by capillary gas chromatography.

Assignees

• Basf Se
• Givaudan Sa

Inventors

• Laubender Matthias
• Benlahmar Ouidad
• Klein Regina
• Stracke Joseph
• Leibach Patrick
• Ness Jeremy

Classifications

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title

• A61Q15/00

  Anti-perspirants or body deodorants (deodorisation of air A61L9/00) · CPC title

• A61K8/8129

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers or esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers, e.g. polyvinylmethylether · CPC title

• A61K2800/594

  Mixtures of polymers · CPC title

• A61K8/11

  Encapsulated compositions · CPC title