Dispensing – Processes of dispensing
Patent
1993-12-01
1995-08-08
Kashnikow, Andres
Dispensing
Processes of dispensing
222135, 2221451, 222394, B67D 552
Patent
active
054391377
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for forming an extemporaneous mixture of at least two liquid or pasty components, kept during storage in closed compartments, isolated from each other, the first component being placed in a can intended to be put under pressure by a propellent gas, in which can is disposed a capsule of the capsule type ensuring resupply with propellent gas.
Resupply capsules are known from EP-A-0,349,053 and EP-A-0,446,973. Such a capsule comprises a chamber intended to receive a fluid under relatively high pressure, a valve provided in a wall of said chamber, means for controlling the valve which are suitable for bringing about the opening of the valve and for allowing fluid under pressure to escape when the capsule is in an environment at a pressure lower than a reference value corresponding to the operating pressure of the aerosol can.
In the case of a capsule in accordance with EP-A-0,349,053, the means for controlling the valve, when the capsule is not brought into service, are isolated from the ambient pressure by means of a plug seal which is meltable at low temperature or is able to be dissolved in the liquid from the aerosol can. The melting or dissolving of this plug seal brings the capsule into service.
In the case of a capsule in accordance with EP-A-0,446,973, the valve includes a rod which occupies a first closed position, when the capsule is not in service and when the ambient pressure is lower than the reference pressure; in order to bring the capsule into service, the rod is passed into a second closed position obtained when the ambient pressure is higher than the reference pressure. Once the capsule is in service, if the ambient pressure becomes lower than the reference pressure, the valve opens and allows gas under pressure, coming from the chamber of the capsule, to escape. For this second type of valve, bringing the capsule into service is accompanied by the valve passing, for a short time, via its open position located between the two closed positions, and by a tiny escape of gas under pressure.
Such capsules, as described in the documents mentioned, are used for pressurizing an aerosol can and for ensuring resupply with propellent gas, inside the can, progressively with the use of this aerosol can. Regulation is ensured by the means for controlling the valve which let some gas under pressure, coming from the capsule, escape in order to reestablish the desired pressure inside the aerosol can.
Surprisingly, the purpose of the invention is the application of a capsule of this type for the formation of an extemporaneous mixture of at least two components in a pressurized can.
It is known that the problem of extemporaneous mixing relates, in particular, to forming oxidation dyes for hair. During storage, a first component, constituted for example by a mixture of an oxidation dye in an ammoniacal medium in a vehicle is kept separated from a second component constituted by a hydrogen peroxide solution. At the time of treating the hair, the operator has to form the mixture of the two components there and then in order to obtain the oxidation dye.
Various solutions have already been proposed in this respect, for example by FR-A-2,289,407 or FR-A-2,453,793.
Although the solutions provided make it possible to keep separate the components to be mixed and to form the mixture at the time of use, they remain relatively tricky to employ. Furthermore, they do not make it possible to obtain a mixture in a pressurized can, in particular in the form of an aerosol.
The object of the invention, above all, is to provide a method for forming an extemporaneous mixture of at least two liquid or pasty components, such as defined above, which makes it possible to obtain the mixture, in a simple and rapid manner, in a pressurized can.
According to the invention, a method for forming an extemporaneous mixture of at least two liquid or pasty components, kept during storage in closed compartments, isolated from each other, the first component being placed in a can intended to be put under pressure
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Bauer Daniel
Grollier Jean-Francois
"L'Oreal"
DeRosa Kenneth R.
Kashnikow Andres
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