Aerosol dispensing device containing a hairsetting preparation having a low propellant content

DETAILED DESCRIPTION What is claimed is: 1.
An aerosol dispensing device having i.
a first compartment containing a single liquid phase product and propellant in gaseous form, said single liquid phase comprising by weight from about 50 to about 99% water, from 0 to about 40% of a water-miscible organic solvent, from about 0.
2 to about 5% of a film-forming resin and from about 0.
001 to about 25% of a propellant dissolved therein; ii.
a dispensing valve arranged to interconnect the first compartment and the atmosphere; iii.
a second compartment containing propellant gas; and iv.
a communicating valve arranged to interconnect the second compartment and the first compartment, thereby to allow the propellant gas to pass from the second compartment to the first compartment.
2.
The aerosol dispensing device according to claim 1, wherein in the second compartment the propellant gas is a mixture of a permanent gas and a liquified gaseous propellant.




Description:
The invention relates to hairsetting preparations which are dispensed as a single liquid phase from a pressurized pack, such as an aerosol device.
Hair preparations normally contain a high proportion, usually at least 50% by weight, of liquefied gas propellant in order to ensure, in the interests of economy, that substantially all the contents of the pack are dispensed before the propellant is exhausted.
There are, however, drawbacks with preparations of this type.
For example, it can be disadvantageous to dispense a high proportion of propellant with the preparation, since this can cause an unpleasant cooling sensation on the skin or it can, in the case of a hairspray, lead to an increase in viscosity of the dispensed preparation as propellant is lost, thereby restricting spreading of the atomized preparation on the hair.
Also preparations which include a substantial proportion of water tend to produce a two liquid phase system in the presence of a high proportion of propellant, and it is then necessary to shake the pressurized pack immediately before each use in order to ensure that the preparation is correctly dispensed