EP1382536B1 - Device for the extemporaneous mixture of at least two products - Google Patents

Abstract

The applicator unit (1), to blend together ingredients for the preparation of a cosmetic products, has at least one chamber (9,12) to hold the ingredients e.g. as a liquid and a powder. A body (20), at least partially with elastic compression, is within a passage formed by the structure. The walls (2,3) of the lower container can be squeezed by hand to develop an internal pressure to force the fluid into the passage and displace the elastic body to pass into the second container, and be delivered out of the unit through the applicator (10).

Description

The present invention relates to a device for packaging at least one cosmetic product. The invention is aimed in particular at a device for the extemporaneous mixing of at least two products in order to produce a composition, in particular a cosmetic composition, as used for example in the field of hair dyeing.

Other applications however can be envisaged. The device may in particular be of the type comprising a container containing the product, the distribution of the latter being obtainable in response to a pressure exerted on the walls of the container, or by means of a manually operated pump equipping the device. With devices of this type, it may be desirable, especially with certain products having a high propensity to dry or oxidize in contact with air, to ensure the sealing of the device dispensing orifice. so that any residual product located in the ducts located upstream of the dispensing orifice is kept out of the air.

In other fields, such as that of hair dyeing, the preparation of a large number of dyeing compositions involves the extemporaneous mixing of two (or even three) products (a dye, an oxidant, optionally a perfume) which, for reasons of of stability must be kept apart from each other until the moment of use of the coloring composition. At least one of the products may be in the form of a powder.

In recent years have seen, in the field of hair coloring, the appearance of mixing devices, allowing, more or less automatically, the separate packaging of two products, and their extemporaneous mixture at the time of use of the coloring composition. For purely illustrative purposes, a device of this type is described in patent application FR-A-2 708 913.

Such systems are expensive and often sometimes complicated to achieve. The seals between the two compartments containing each product, is sometimes difficult to achieve. In addition, it is sometimes difficult to find materials, compatible with the compounds to be packaged, due to the high aggressiveness of at least some of these.

There are also systems of a more "manual" operation in which each of the products to be mixed is packaged in a packaging of its own, in particular in the form of a tube or a bag. In order to achieve mixing, the consumer pours the contents of one of the packages into the other, or the contents of the two packages in a third, within which the mixture is made.

All these operations are tedious. The risk is great to get dirty when handling products. The risk is also great for the consumer does not respect the correct dosage and is tempted to use the quantities needed for a single application for two or more applications. This results in hair coloring that does not conform to that expected.

EP 0 606 429 discloses a two-chamber mixing system insulated by a first rubber piston which, in response to a pressure exerted by a second piston, is pushed from a first position in which it isolates the two products to a single position. second position in which it delimits, in combination with an inner surface of a throttling zone separating the two chambers, a passage capable of allowing the two products to come into contact with one another.

The disadvantages of such a structure are numerous. Thus, it is difficult to adapt to the mixture of non-liquid products, in particular in the form of powders. It is limited to the preparation of small volumes. Its operation is not very comfortable, in particular because of the great pressure to exert to force the rubber piston to deform and engage in a portion whose cross section is shaped differently from the shape of the piston.

Also, is it an object of the present invention to provide a packaging device, in particular for extemporaneous mixing of at least two products, which solves all or part of the problems mentioned above with reference to the conventional systems discussed above.

It is particularly an object of the invention to provide such a device which is simple to use and can be produced at low cost.

It is another object of the invention to provide such a device which limits the risks of misuse, and which thereby reduces the risks of obtaining a mixture whose properties do not conform to what is expected. .

Still other objects will appear in the following detailed description.

According to the invention, the device is defined by the features of claim 1 divided into two parts with respect to the prior art according to US-A-2002/0 066 750.

By "fluidics" is meant "hydraulic" (liquid) or "pneumatic" (air).

The passage may be a passage located upstream of an outlet of the device, which passage, outside the product distribution phases, must be kept closed as tightly as possible, to prevent any residual product located upstream of the outlet orifice does not dry or oxidize on contact with air.

Alternatively, the passage may be a passage formed between two compartments formed by the device. According to this variant, the device delimits a first compartment containing a first product, and a second compartment, adapted to be disposed at least partly above the first, and containing a second product, a first separation member being adapted to pass from a first position in which it isolates the first product of the second to a second position in which the first product is brought into contact with the second, the device being configured so that the passage of the first separation member from the first to the second position results, at the sensible balance of pressures between the first and second compartments, a volume reduction, especially multidirectional, said first separation member in response to an overpressure generated within one and / or the other of said first and second compartments.

Thus, the separation member is such that it ensures the physical separation of the two products. On the other hand, it must allow the balance of pressures to be made.

In practice, the lower the level of tightness required to ensure the physical separation of the two products, the lower the overpressure to be generated, and the more the operation will be comfortable. For this reason, at least the product contained in the second compartment and which, when the second compartment is above the first compartment, rests on the separating member, is preferably in the form of a powder. The other product can be in particular in liquid form.

Due to this configuration of the device, the mixing is extremely simple to implement.

In particular, the fluid pressure exerting substantially uniformly over the entire free surface of the separating member, a low overpressure is sufficient to cause the passage of the latter from the first to the second position.

This is not the case in systems of the type of that described with reference to patent EP 0 606 429, and in which the separating plug is forced to move in response to a pressure exerted unilaterally, the pressure being further transmitted via the product located between the separation cap and the pusher piston. Such pressure exerted on the product, sandwiched between the cap and the piston, can be detrimental to the product, especially when it is a powder.

Preferably, the volume reduction is reflected at least by a reduction of the surface of the first separation member, transversely to a longitudinal axis of the device, and this over its entire axial height. Thus, in the first position, the separating member is sufficiently large diameter to hold in place by slight tightening, despite the weight of the second product disposed above. In response to the pressure exerted in a multidirectional manner, the separating member compresses in all directions, in particular radially to its axis. As a result, it is no longer clamping, and, under the effect of its weight, added to the weight of the second product, it falls with it into the first container. The two products are then in contact with each other.

In the case of a separator of circular cross section, a diameter reduction of some 10 ^ems mm suffices to obtain the result.

In practice, the pressure exerted on the separating member being substantially uniform over its entire outer surface, there is also a slight decrease in the axial height of the separating member. In the latter case, the volume reduction is multidirectional. The separating member is made of a material capable of shrinking under the effect of this overpressure, it is therefore able to reduce volume.

Preferably, the overpressure is generated in the first compartment when the latter is below the second, the level of first product in the first compartment being such that the passage from the first to the second position takes place before the first product comes into contact with said first separation member. The pressure exerted on the separating member is pneumatic.

Alternatively, the overpressure can be exerted on the compartment disposed above the other. Assuming that the product contained in the compartment above is a liquid, of density greater than the density of the material forming the separating member, then, in response to the overpressure, the separating member decreases in volume, and is no longer held in the position where it isolates the two compartments. It then rises to the surface of the liquid as it mixes with the product contained in the other compartment. In this case, the pressure exerted on the separation member is hydraulic.

Preferably, the first separation member is constituted at least in part by an element formed of an elastically compressible material in response to said overpressure, and at least a portion of the outer surface is impermeable. By "waterproof" is meant to be impermeable to the pressurizing fluid, in particular to air.

More preferably, the material is a closed-cell foam material. It may be in particular a polyethylene foam, polyester or polyurethane.

Preferably, in the second position, said first separating member floats on the surface of the mixture. Thus, the separation member does not disturb the distribution of the mixture.

As indicated above, the first separating member is preferably disposed inside a passage formed between the first and second compartments and is, prior to said overpressure, maintained in said first position, by partial compression in at least one direction transverse to said passage, in contact with an inner surface delimiting said passage. Despite this slight compression of the separation member, the air can pass between the lateral surface of the separating member and the inner surface of the passage, thus allowing the achievement of pressure equilibrium.

At the pressure equilibrium, the pressure of the first compartment and the second compartment are substantially identical and each in excess pressure relative to the initial pressure of these compartments. The separating member disposed between these two compartments is in fact compressed in at least two opposite directions, for example the pressure is at least applied to two opposite sides of this member coming into contact with the inner surface of the passage

According to a preferred embodiment, at least one of the walls delimiting one and / or the other of said first and second compartments is elastically deformable so as to be able to generate said overpressure in response to a pressure exerted, laterally or axially, on said resiliently deformable wall.

More specifically, at least a portion of one and / or the other of said first and second compartments may form a bellows. In this case, the pressure to exert is axial.

Alternatively, the compartment inside which the overpressure is generated is delimited by a container with elastically compressible walls. In this case, the pressure to be exerted is transverse to the axis.

According to a specific embodiment, the first compartment is delimited by a first container, the second compartment being delimited by a second container, adapted to be mounted on the first, in particular by screwing or snapping.

The second container then has an opening which, when said first separator member is in the first position, is isolated from the second product by said first separator member.

Advantageously, said opening, prior to mounting the second container on the first, is closed removably by means of closure, in particular in the form of a plug, in particular screwed.

Means are provided for, prior to mounting the second container on the first, maintain in a fixed position said first member separation.

• i) d'une part, une portion du bouchon ; et
• ii) d'autre part, d'une butée axiale située du côté du premier organe de séparation opposé au bouchon.

Such immobilization means may consist of:

• i) a portion of the plug; and
• ii) on the other hand, an axial stop located on the side of the first separator member opposite the stopper.

Thus, as long as the cap is in place on the second container, it axially immobilizes the separating member. Once the cap is removed, when positioning the second container above the first, the second product is retained within the second container by the separating member.

Advantageously, the second compartment is delimited by an element forming an applicator tip for mixing said products.

Preferably, the second compartment is able to communicate with a dispensing orifice which, prior to mixing, is closed by a closure member, in particular in the form of a self-breaking element.

According to another embodiment, the device forms a third compartment adapted to be disposed at least partly above the second and containing a third product, said first, second and third products being isolated in pairs by said first separation member. and by a second separating member, said first and second separating members being adapted to pass each of a first position in which they isolate two by two said first, second and third products, at a second position in which the three products are brought into contact with each other, the passage of the first and second separating member from the first position to the second resulting, the sensible balance of pressures between the compartments they respectively separate, a volume reduction multidirectional of said first and second separation member in response to an overpressure generated within one and or the other of said first, second and third compartments.

Preferably, the mixture is made by positioning the device so that the second compartment is above the first, the third, above the second, and pressurizing the first.

The second and third products may be packaged separately from each other, in the same container, in particular in an applicator tip.

Advantageously, the (or) product (s) contained in the (or) compartment (s) other (s) than that inside which is generated said overpressure, is (are) in powder form. Thus, the first product may be an oxidant in liquid form. The second product may be a dye in the form of a powder. The third product may be a perfume composition, in the form of a powder as well.

According to another aspect, the present application relates to a device for the extemporaneous mixing of at least two products, the device forming a first compartment containing a first product and a second compartment, adapted to be arranged at least partly above the first, and containing a second product, a separating member being adapted to move from a first position in which it isolates the first product from the second to a second position in which the first product is brought into contact with the second, the device being configured to so that the passage of the separating member from the first position to the second results from an overpressure generated in one or the other of said first and second compartments, characterized in that said separating member, when its passage from the first position to the second, moves towards the compartment inside which the overpressure is generated.

As indicated above, the device according to the invention can be used for producing a mixture intended to form a cosmetic composition, in particular for hair dyeing.

• la figure 1 est une vue éclatée d'un dispositif selon un premier mode de réalisation de l'invention ;
• la figure 2 est une vue en coupe du dispositif de la figure 1 ;
• les figures 3A-3F illustrent les principales étapes de fonctionnement du dispositif des figures 1 et 2.
• la figure 4 est une vue en coupe d'un dispositif selon un second mode de réalisation de l'invention ; et
• les figures 5A-5D illustrent les principales étapes de fonctionnement du dispositif de la figure 4.

The invention consists, apart from the arrangements described above, in a certain number of other arrangements which will be explained below, with reference to nonlimiting exemplary embodiments, described with reference to the appended figures, among which:

• Figure 1 is an exploded view of a device according to a first embodiment of the invention;
• Figure 2 is a sectional view of the device of Figure 1;
• FIGS. 3A-3F illustrate the main operating steps of the device of FIGS. 1 and 2.
• Figure 4 is a sectional view of a device according to a second embodiment of the invention; and
• FIGS. 5A-5D illustrate the main operating steps of the device of FIG. 4.

The device 1 shown in Figures 1 and 2 comprises a container 2, one end terminates in a bottom 3. A portion 4 of the body of the container, adjacent to the bottom 3, is configured as a bellows. The container 2 delimits a housing 9 intended to contain a coloring oxidant in liquid form.

The end of the container opposite the bottom 3 ends with a threaded neck 5 delimiting an opening 6.

The container 2 is obtained by extrusion blow molding of polyethylene or polypropylene.

In the storage and / or transport position of the device 1, the container 2 is closed by a plug 7 whose inner surface has a thread capable of cooperating with the thread of the neck 5. In a conventional manner, the plug 7 comprises a skirt tightness 8.

The device 1 also comprises an applicator tip 10.

The applicator tip 10 consists of a hollow element of elongated shape, a portion 11 of which is of progressively decreasing cross-section towards a small section opening 19, closed by a self-breaking endpiece 40.

In the vicinity of its end opposite to the self-breaking end 40, the applicator tip 10 comprises a first cylindrical portion 13, of greater diameter than the largest diameter of the portion 11, and separated from the latter by a shoulder 14.

On the side of the first cylindrical portion 13, opposite the portion 11, the applicator tip 10 forms a second cylindrical portion 15 of internal diameter greater than the internal diameter of the first cylindrical portion 13. A free edge of the cylindrical portion 15 defines a opening 45 for the applicator tip 10.

The second cylindrical portion 15 is separated from the first 13 by a shoulder 16.

The inner surface of the second cylindrical portion 15 comprises a screw thread 17. Within the cylindrical portion 15, a sealing skirt 18, extending axially from the shoulder 16, is formed in the direction of the end of the tip 10, opposite the self-breaking tip 40.

The applicator tip 10 is obtained by injection of a rigid thermoplastic material, such as a polyamide, a polystyrene, a polycarbonate, a polypropylene, an acrylobutadiene styrene (ABS), or a polystyrene acrylonitrile (SAN).

After introduction of a coloring powder into the housing 12 delimited by the portion 11 of the applicator tip, a block of closed-cell polyurethane foam 20 is disposed inside the cylindrical portion 13. The foam block 20 is of height substantially identical to that of the cylindrical portion 13. The insertion movement of the foam block inside the nozzle 10 is limited by the presence of the shoulder 14, against which abuts a surface 21 of the block of foam 20.

The diameter at rest of the foam block 20 is slightly greater than the internal diameter of the cylindrical portion 13 so as to be slightly compressed laterally within the cylindrical portion 13. The degree of compression is sufficient to allow the foam block 20 to hold itself inside the cylindrical portion 13 despite the weight of powder in the portion 11 of the applicator tip 10.

During storage and / or transport, the end of the tip 10 is closed by a plug 30, an outer surface has a thread 31 adapted to cooperate with the thread 17 of the tip 10. A transverse wall 32 of plug 30 is arranged to come into substantial contact with the surface 22 of the foam block opposite the surface 21.

An outer wall 33, concentric with the annular wall on which the thread 31 is formed, allows the cap 30 to be handled.

The operation of the device 1 which has just been described will now be explained with reference to FIGS. 3A-3F.

In FIG. 3A, the receptacle 2 has been stripped of its plug 7. The tip 10 has been stripped of its plug 30. Even in the up-head position, the foam block 20 holds by slight compression inside the cylindrical portion 13 of the nozzle 10, and this, despite the weight of the powder which, therefore, is retained inside the housing 12.

In FIG. 38, the tip 10 is screwed onto the receptacle 2.

In Figure 3C, an axial pressure is exerted on the bottom 3 of the container 2 so as to axially compress the portion 4 forming a bellows. This results in an overpressure inside the container 2. Due to the absence of airtightness around the foam block 20, the pressures are balanced between the housing 9 and the housing 12. Of this In fact, the overpressure is exerted substantially uniformly over the entire outer surface of the foam block 20. The latter compresses in a multidirectional manner. This results in particular in a reduction of its outer diameter, sufficient so that it is no longer retained within the cylindrical portion 13. It then falls under the effect of its weight, added to the weight of powder contained in the housing 12.

In FIG. 3D, the two products are mixed inside the container 2. The foam block 20 floats on the surface of the mixture. The mixture can be homogenized by stirring the device 1 adequately.

In FIG. 3E, the opening 19 of the applicator tip 10 is disengaged by breaking the self-breaking endpiece 40.

In FIG. 3F, the mixture is conventionally applied to the hair by means of the bellows portion 4 to precipitate the exit of the mixture via the opening 19.

• i) de prévcir sur la surface interne de l'épaulement 14, une nervure annulaire (non représentée), de manière à réduire les risques de formation, avant utilisation du dispositif, d'un film liquide entre la surface latérale du bloc de mousse 20 et la surface interne de la portion cylindrique 13 ; et
• ii) de réaliser le mélange en position tête en bas du dispositif, le matériau formant le bloc de mousse 20 étant de densité inférieure à celle du liquide contenu dans le récipient 2.

In the event that it is desired to use the device which has just been described with two liquids, it may be advantageous:

• i) to provide on the inner surface of the shoulder 14, an annular rib (not shown), so as to reduce the risk of formation, before use of the device, of a liquid film between the lateral surface of the foam block 20 and the inner surface of the cylindrical portion 13; and
• ii) to effect mixing in the head-down position of the device, the material forming the foam block 20 being of a lower density than that of the liquid contained in the container 2.

• i) le récipient 2 est à parois déformables élastiquement en réponse à une pression exercée sur le récipient, de façon sensiblement perpendiculaire à l'axe X ; et
• ii) sensiblement à mi-hauteur entre la portion cylindrique 13 de l'embout 10, et l'embout auto-cassable 40, l'embout applicateur 10 présente une autre portion cylindrique 41, de diamètre interne légèrement inférieur au diamètre interne de la portion cylindrique 13. La portion cylindrique 41 est séparée de la portion de l'embout applicateur adjacente à l'élément auto-cassable 40 par un épaulement annulaire 42. A l'intérieur de la portion cylindrique 41 est disposé un bloc de mousse 50 similaire au bloc de mousse 20, et dont une face 51 est en butée axiale contre l'épaulement 42. Ainsi, en position montée de l'embout applicateur 10 sur le récipient 2, le bloc de mousse 20 sépare le compartiment 9 délimité par le récipient 2 du compartiment 12 formé en partie basse de l'embout applicateur 10. Le bloc de mousse 50 sépare le compartiment 12 d'un compartiment 43 formé en partie haute de l'embout applicateur. Le compartiment 9 contient un oxydant de coloration sous forme liquide. Le compartiment 12 contient un colorant sous forme d'une poudre. Le compartiment 43 contient un agent parfumant sous forme d'une poudre.

The embodiment of FIG. 4 to which reference is now made differs from the previous one mainly in that:

• i) the container 2 is elastically deformable walls in response to a pressure exerted on the container, substantially perpendicular to the axis X; and
• ii) substantially at mid-height between the cylindrical portion 13 of the nozzle 10, and the self-breaking tip 40, the applicator tip 10 has another cylindrical portion 41, of internal diameter slightly smaller than the internal diameter of the portion cylindrical 13. The cylindrical portion 41 is separated from the portion of the applicator tip adjacent to the self-breaking element 40 by an annular shoulder 42. Inside the cylindrical portion 41 is disposed a block of foam 50 similar to the foam block 20, and a face 51 is in axial abutment against the shoulder 42. Thus, in the mounted position of the applicator tip 10 of the container 2, the foam block 20 separates the compartment 9 defined by the container 2 of the compartment 12 formed in the lower part of the applicator tip 10. The foam block 50 separates the compartment 12 from a compartment 43 formed in the upper part of the applicator tip. Compartment 9 contains a coloring oxidant in liquid form. Compartment 12 contains a dye in the form of a powder. The compartment 43 contains a perfuming agent in the form of a powder.

The rest of the device is similar to what has been described with reference to the previous embodiment. As a result, its detailed description will not be repeated here.

In use, initially, everything happens in accordance with what has been described for the first embodiment with reference to Figures 3A and 3B.

The remainder of the process is illustrated with reference to Figures 5A-5D to which reference is now made.

In FIG. 5A, the compartment 9 is pressurized in response to a pressure exerted transversely on the deformable walls of the receptacle 2. This results in an overpressure inside the receptacle 2. Due to the lack of impermeability to the air around the foam block 20 and the foam block 50, the pressures are equilibrated almost instantaneously between the housings 9, 12, and 43. As a result, the overpressure is exerted substantially uniformly on the the entire outer surface of the foam blocks 20 and 50. These are compressed in a multidirectional manner. This results in particular a reduction in their outer diameter, sufficient so that they are no longer retained within their respective cylindrical portions 13 and 41. They then fall under the effect of their weight, added to the weight of powder contained respectively in dwellings 12 and 43.

In practice, the two mouse blocks fall slightly sequentially, the block 20 falling before the block 50.

In Figure 5B, the three products are mixed inside the housing 9. The foam blocks 20 and 50 float on the surface of the mixture. The mixture can be homogenized by stirring the device 1 adequately.

In FIG. 5C, the opening 19 of the applicator tip 10 is disengaged by breaking the self-breaking endpiece 40.

In FIG. 5D, the mixture is conventionally applied to the hair by compressing the deformable body of the container 2 to precipitate the exit of the mixture via the opening 19.

In the foregoing detailed description, reference has been made to preferred embodiments of the invention. It is obvious that variations can be made without departing from the subject of the invention as claimed hereinafter.

Claims (22)

1. Device (1) for packaging at least one product, particularly a cosmetic product, the device comprising:

   i) at least one first compartment (9, 12) intended to contain the said product;

   ii) a second compartment connected by a passage (13) to the first compartment;

   ii) a member (20), at least partially elastically compressible, positioned in the said passage (13) of the device; and

   iii) means (2, 3) for, in response to a manual actuating command, generating a fluidic overpressure, characterized in that the fluidic overpressure on at least part of the elastically compressible member (20) is applied in at least two opposite directions so as to cause a reduction in volume of the compressible member in order to at least partially uncover the said passage.
2. Device (1) according to Claim 1, characterized in that:

   a) the first compartment (9) contains a first product and the second compartment (12), able to be positioned at least partially above the first compartment, contains a second product;

   b) the said elastically compressible member forms a first dividing member (20) able to move from a first position in which it isolates the first product from the second into a second position in which the first product is brought into contact with the second, the device being configured in such a way that the movement of the first dividing member (20) from the first position to the second results, if the pressures in the first and second compartments are substantially equal, from a reduction in volume of the said first dividing member (20) in response to an overpressure generated inside one and/or other of the said first and second compartments (9, 12).
3. Device (1) according to Claim 1 or 2, characterized in that the reduction in volume of the compressible member (20) is manifested at least in a reduction in the surface area of a section transverse to the axis of the passage (13) of the said elastically compressible member (20).
4. Device (1) according to Claim 2 or 3, characterized in that it is configured in such a way that the movement of the said first dividing member (20) from the first to the second position results from an overpressure generated in the first compartment (9) when the latter is under the second (12), the level of first product in the first compartment (9) being such that the movement from the first to the second position occurs before the first product comes into contact with the said first dividing member (20).
5. Device (1) according to any one of Claims 1 to 4, characterized in that the elastically compressible member (20) has an external surface which is at least partially impermeable.
6. Device (1) according to Claim 5, characterized in that the elastically compressible member (20) is at least partially formed from a closed-cell cellular material.
7. Device (1) according to Claim 6, characterized in that the closed-cell cellular material is a polyethylene, polyester or polyurethane foam.
8. Device (1) according to Claim 2 and any one of Claims 3 to 7, characterized in that, in the second position, the said first dividing member (20) floats on the surface of the mixture.
9. Device (1) according to Claim 2 and any one of Claims 3 to 8, characterized in that the first dividing member (20) is positioned inside a passage (13) formed between the first and second compartments and, prior to the said overpressure, is kept in the said first position by partial compression in at least one direction transverse to the said passage in contact with an internal surface delimiting the said passage.
10. Device (1) according to any one of Claims 1 to 9, characterized in that at least one of the walls delimiting the said compartment (9, 12) or one of the said compartments is elastically deformable so as to be able to generate the said overpressure in response to pressure exerted laterally or axially on the said elastically deformable wall.
11. Device (1) according to any one of Claims 1 to 10, characterized in that at least part (4) of the said compartment (9, 12) or one of the said compartments forms a bellows.
12. Device (1) according to Claim 2 and any one of Claims 3 to 11, characterized in that the first compartment (9) is delimited by a first container (2), the second compartment (12) being delimited by a second container (10) able to be mounted on the first, particularly by screw-fastening or snap-fastening.
13. Device (1) according to Claim 12, characterized in that the second container (10) comprises an opening (45) which, when the first dividing member (20) is in the first position, is isolated from the second product by the said first dividing member (20).
14. Device (1) according to Claim 13, characterized in that the said opening (45), before the second container is mounted on the first, is closed off removably by shut-off means (30), particularly in the form of a cap, especially a screw cap.
15. Device (1) according to Claim 13 or 14, characterized in that means (14, 32) are provided for keeping the said first dividing member (20) in a fixed position before the second container (10) is mounted on the first (2).
16. Device (1) according to Claim 15, characterized in that the said immobilizing means consist:

    i) on the one hand, of a portion (32) of the cap (30); and

    ii) on the other hand, of an axial stop (14) situated on the opposite side of the first dividing member (20) to the cap (30).
17. Device (1) according to Claim 2 and any one of Claims 3 to 16, characterized in that the second compartment (12) is delimited by an element (10) that forms a nozzle for applying the mixture of the said products.
18. Device (1) according to Claim 17, characterized in that the second compartment is able to communicate with a dispensing orifice (19) which, before mixing, is closed off by a shut-off member (40), particularly in the form of a snap-off element.
19. Device (1) according to Claim 2 and any one of Claims 3 to 18, characterized in that it forms a third compartment (43) able to be positioned at least partially above the second (12) and containing a third product, the said first, second and third products being isolated one from the next by the said first dividing member (20) and by a second dividing member (50), the said first and second dividing members (20, 50) each being able to move from a first position in which they isolate the said first, second and third products one from the next into a second position in which the three products are brought into contact with one another, the movement of the first and second dividing members from the first position into the second resulting, if the pressures between the two compartments that they respectively isolate are equal, from a multidirectional reduction in volume of the said first and second dividing members (20, 50) in response to an overpressure generated inside one and/or other of the said first, second and third compartments (9, 12, 43).
20. Device (1) according to Claim 2 and any one of Claims 3 to 19, characterized in that the product(s) contained in the compartment(s) (12, 43) other than the compartment (9) in which the said overpressure is generated is (are) in pulverulent form.
21. Device (1) for the extemporaneous mixing of at least two products, the device forming a first compartment (9) containing a first product and a second compartment (12) able to be positioned at least partially above the first and containing a second product, a dividing member (20) being able to move from a first position in which it isolates the first product from the second into a second position in which the first product is brought into contact with the second, the device being configured in such a way that the movement of the dividing member (20) from the first position to the second results from an overpressure generated in one or other of the said first and second compartments, characterized in that the said dividing member (20), as it moves from the first position to the second, moves towards the compartment in which the overpressure is generated.
22. Use of a device (1) according to any one of the preceding claims for producing a mixture intended to form a cosmetic composition, particularly for colouring hair.

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