Hair compositions and methods of use thereof

1. A hair treatment composition comprising

at least one monohydric alcohol having 1 to 6 carbon atoms;

hollow, fluid-filled microspheres, wherein the microspheres are present at a level of 0.01% to 2.0% by weight of the composition, have a mean particle size of 10 to 40 micron, and have a density of 0.01 g/cm 3 to about 0.6 g/cm 3 in the expanded state;

at least one polymer fixative present at a level of 0.1% to 10% by weight of the composition; and

at least one propellant present at a level of 65% to 85% by weight of the composition, wherein the composition is essentially anhydrous.

2. A hair treatment composition packaged in an aerosol device comprising

at least one monohydric alcohol having 1 to 6 carbon atoms;

hollow, fluid-filled microspheres, wherein the microspheres are present at a level of 0.01% to 2.0% by weight of the composition, have a mean particle size of 10 to 40 micron, and have a density of 0.01 g/cm 3 to about 0.6 g/cm 3 in the expanded state;

at least one polymer fixative present at a level of 0.1% to 10% by weight of the composition; and

at least one propellant present at a level of 65% to 85% by weight of the composition, wherein the composition is essentially anhydrous.

3. The composition of claim 1 , wherein the monohydric alcohol is selected from ethanol and isopropyl alcohol.

4. The composition of claim 1 , wherein the monohydric alcohol is present at a level from about 2% to about 20% of the composition.

5. The composition of claim 1 , wherein the microspheres comprise a thermoplastic material wall.

6. The composition of claim 5 , wherein the thermoplastic material is a polymer or copolymer of at least one monomer selected from the group consisting of acrylates, methacrylates, styrene, substituted styrene, unsaturated dihalides, acrylonitriles, methacrylonitriles, vinyl and vinyl chloride.

7. The composition of claim 6 , wherein the polymer or copolymer is essentially free of one or more residual starting materials.

8. The composition of claim 7 , wherein the polymer or copolymer comprises less than about 0.01% of one or more residual starting materials.

9. The composition of claim 5 , wherein the thermoplastic material is a acrylonitrile/methyl methacrylate/vinylidene chloride copolymer.

10. The composition of claim 5 , wherein the thermoplastic material is a acrylonitrile/methacrylonitrile/methyl methacrylate copolymer.

11. The composition of claim 9 or 10 , wherein the copolymer is essentially free of unreacted acrylonitrile.

12. The composition of claim 9 or 10 , wherein the copolymer comprises less than about 0.01% unreacted acrylonitrile.

13. The composition of claim 1 , wherein the microspheres have a mean particle size of about 20 micron.

14. The composition of claim 1 , wherein the microspheres are present at a level of about 0.1 to about 0.5% of the composition.

15. The composition of claim 1 , wherein the polymer fixative is present at a level of about 0.5 to 5% by weight of composition.

16. The composition of claim 1 , wherein the polymer fixative is nonionic, anionic, or cationic in charge.

17. The composition of claim 1 , wherein the propellant is selected from the group consisting of dimethyl ether, difluoroethane, tetrafluoroethane, propane, n-butane, isobutane, n-pentane, isopentane, compressed air, carbon dioxide, nitrogen gas, nitrous oxide, and combinations thereof.

18. A method of volumizing hair of a subject, comprising the steps of applying a composition of claim 1 to the hair; and optionally heating the hair, thereby volumizing the hair.

19. The method of claim 18 , wherein the composition is applied to dry hair.

20. The method of claim 18 , wherein the hair is heated from about 40 to about 230° C.

21. The method of claim 18 , wherein the hair is heated with a styling tool.