Emulsions containing encapsulated fragrances and personal care compositions comprising said emulsions
The present invention provides an emulsion comprising an organic discontinuous phase which is distributed throughout a continuous aqueous phase, wherein the organic phase comprises, a) an organic solvent which is a liquid at 25° C. and/or, b) an organic phase stabilising material that comprises hydrophobic moieties and is a material which is more soluble in the organic phase than the aqueous phase, and the emulsion further comprises an encapsulated fragrance, said fragrance is encapsulated in microparticles. The present invention also relates to personal care compositions comprising emulsions containing encapsulated fragrances for improved fragrance delivery. The present invention also relates a method of use that comprises application of an effective amount of a liquid or solid personal care composition comprising an emulsion that contains a fragrance encapsulated in microparticles to at least one part of the body.
1. An emulsion comprising an organic discontinuous phase which is distributed throughout a continuous aqueous phase,
wherein the organic phase comprises
a) C12-15 alkyl benzoate organic solvent and
b) an addition polymer formed from 40 to 90% by weight stearyl methacrylate, 10 to 40% by weight of maleic anhydride and 30 to 50% by weight styrene as an organic phase stabilising material,
where the emulsion further comprises an encapsulated fragrance, said fragrance is encapsulated in microparticles,
wherein the microparticles comprise a core-shell configuration and
wherein the shell part of the microparticle comprises a polymer formed from the combination of acrylic acid and styrene, and
wherein the core part of the microparticle comprises a polymer formed from the combination of styrene and 2-ethylhexylacrylate.
2. An emulsion according to claim 1 wherein the amount of organic solvent is between 0.01% and 50% by weight based on the total weight of the emulsion.
3. An emulsion according to claim 1 wherein the amount of organic phase stabilising material is from about 0.01 to about 15.0% by weight based on the total weight of the emulsion.
4. An emulsion according to claim 1 wherein the amount of fragrance is from about 0.001% to about 20% by weight based on the total weight of the emulsion.
5. An emulsion according to claim 4 wherein the amount of fragrance is from about 0.01% to about 10% by weight based on the total weight of the emulsion.
6. An emulsion according to claim 5 wherein the amount of fragrance is from about 0.1% to about 1% by weight based on the total weight of the emulsion.
7. An emulsion according to claim 1 wherein the polymer formed from styrene and 2-ethylhexylacrylate of the core part of the microparticle has an average molecular weight of about 150,000 to about 350,000.
8. An emulsion according to claim 1 wherein the polymer formed from acrylic acid and styrene of the shell part of the microparticle has an average molecular weight of about 6,000 to about 15,000 g/mol.
9. A personal care composition comprising an effective amount of the emulsion according to claim 1 .
10. A method of improved fragrance delivery to the human body said method comprising the steps of:
a) applying an effective amount of a personal care composition comprising an emulsion according to claim 1 to at least one part of the human body; and
b) rubbing the effected part of the human body with sufficient force to efficiently distribute the personal care composition evenly.