Capsule composition
An encapsulated perfume composition for use in personal care products adapted to be applied to, and left on, the skin or hair of a human or animal subject, said encapsulated perfume composition comprising one or more polyurea capsules having a volume average diameter of 20 to 90 microns, and a capsule shell weight, which is 5 to 40% based on the total weight of the capsules.
1. An encapsulated perfume composition comprising one or more polyurea capsules having a volume average diameter of 20 to 90 microns, and a capsule shell weight, which is 5 to 40% by weight of the total weight of the capsules (core+shell), wherein the nominal rupture stress of the polyurea capsules is in the range of 0.1 to 2 MPa.
2. An encapsulated perfume composition according to claim 1 wherein the ratio of the shell weight, expressed as a percentage of the total weight of the capsules (core+shell) to the capsule volume average diameter, expressed in microns, is 0.7 microns −1 or less.
3. An encapsulated perfume composition according to claim 1 , wherein the encapsulated perfume comprises at least 60% by weight of perfume ingredients having solubility in water of 15000 ppm or less.
4. An encapsulated perfume composition according to claim 1 , wherein the capsules contain no encapsulated solvent.
5. An encapsulated perfume composition according to claim 1 in the form of a powder comprising a silica flow aid, wherein the silica has a particle size of 1 to 8 microns.
6. An encapsulated perfume composition according to claim 4 , wherein the silica flow aid is SYLOID FP 244.
7. A method of forming an encapsulated perfume composition according to claim 4 , said method comprising the step of: dispersing the silica in the encapsulated perfume composition in the form of a slurry, and thereafter dehydrating the slurry.
8. A method according to claim 7 , wherein the slurry is dehydrated by spray drying.
9. A leave-on personal care product comprising an encapsulated perfume composition according to claim 1 .
10. A leave-on product according to claim 9 in the form of a deodorant product.
11. A leave on product according to claim 9 in the form of an anti-perspirant.
12. An encapsulated perfume composition according to claim 1 , wherein the nominal rupture stress of the polyurea capsules is in the range of 0.2 to 1.5 Mpa.
13. An encapsulated perfume composition according to claim 1 , wherein the nominal rupture stress of the polyurea capsules is in the range of 0.4 to 1 MPa.