EP1382536A1 - 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 relates in particular to a device for mixing extemporaneous with at least two products in order to produce a composition, especially cosmetic, as used for example in the field of hair coloring.

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

In other fields, such as that of hair coloring, the preparation of many coloring compositions involve the extemporaneous mixing of two (or even three) products (a colorant, an oxidant, possibly a perfume) which, for reasons of stability, must be kept separate from each other until the time of use of the coloring composition. At least one of products can be in the form of a powder.

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

Such systems are expensive and often sometimes complicated to produce. The sealing between the two compartments containing each of the products, 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 at least some of these.

There are also systems of more "manual" operation in which each of the products to be mixed is packaged in a its own packaging, in particular in the form of a tube or a bag. With a view to making the mixture, the consumer pays the content of one of the packages in the other, or the content of both packaging in a third, inside which mixing takes place.

All of these operations are tedious. There is a great risk of getting dirty during product handling. The risk is also great for the consumer does not respect the correct dosage and is tempted to use the quantities required for a single application for two or more applications. It hair coloring is then produced which does not conform to that expected.

Patent EP 0 606 429 describes a mixing system with two isolated chambers by a first rubber piston which, in response to pressure exerted by a second piston, is pushed from a first position in which it isolates the two products towards a second position in which it delimits, in combination with an internal surface of a bottleneck separating the two chambers, a passage capable of allowing the two products to come into contact.

The disadvantages of such a structure are numerous. So, it is hardly suitable for mixing non-liquid products, in particular in the form of powders. It is limited to the preparation of small volumes. How it works not very comfortable, especially due to the high pressure to exercise to force the rubber piston to deform and engage in a portion whose cross section is of a shape different from the shape of the piston.

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

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

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

Other objects will appear in the detailed description which follows.

i) au moins un compartiment destiné à contenir ledit produit ;

ii) un organe, au moins en partie compressible élastiquement, disposé dans un passage formé par le dispositif ; et

iii) des moyens pour, en réponse à une commande d'actionnement manuelle, générer une surpression fluidique qui, sur au moins une partie de l'organe compressible élastiquement, s'applique selon au moins deux directions opposées, de manière à provoquer une réduction de volume de l'organe compressible pour dégager au moins en partie ledit passage.

According to the invention, the device comprises:

i) at least one compartment intended to contain said product;

ii) a member, at least partially resiliently compressible, disposed in a passage formed by the device; and

iii) means for, in response to a manual actuation command, generating a fluidic overpressure which, on at least part of the elastically compressible member, is applied in at least two opposite directions, so as to cause a reduction volume of the compressible member to at least partially clear said passage.

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

The passage may be a passage located upstream of an outlet orifice 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 air contact.

Alternatively, the passage can 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, able to be arranged at least partly above the first, and containing a second product, a first separation member being able to pass 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 so that the passage of the first separation element from the first to the second position results, at equilibrium pressure sensitive between the first and second compartments, of a reduction in volume, in particular multidirectional, of said first organ of separation in response to overpressure generated within one and / or the other 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 take place.

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

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

In particular, the fluid pressure being exerted in a substantially uniform manner over the entire free surface of the separation member, a low overpressure is sufficient to cause the latter to move from the first to the second position.

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

Preferably, the reduction in volume results at least in a reduction in the surface of the first separation member, transversely to a longitudinal axis of the device, and this over its entire axial height. So in the first position, the separating member is of sufficiently large diameter to hold in place by slight tightening, despite the weight of the second product placed above. In response under pressure exerted in a multidirectional manner, the separating member compresses in all directions, particularly radially to its axis. From this done, it is no longer tight, and, under the effect of its weight, added to the weight of the second product, it falls with the latter into the first container. Both products are then in contact with each other.

In the case of a separation member of circular cross section, a reduction in diameter of some 10 ^th of mm is sufficient 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 separation member. In this last , case, the volume reduction is multidirectional. The separator 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 latter, the level of the former produced in the former 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. The pressure exerted on the separation member is pneumatic.

Alternatively, the overpressure can be exerted on the compartment arranged at the above each other. In the event that the product contained in the compartment of the above is a liquid, with a density greater than the density of the material forming the separation member, then, in response to the overpressure, the separation member decreases in volume, and is no longer retained in the position where it isolates the two compartments. It then rises to the surface of the liquid as this 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 for part of an element formed of an elastically compressible material in response to said overpressure, and of which at least part of the external surface is raincoat. By "impermeable" is meant impermeable to the pressurizing fluid, especially in the air.

More preferably, the material is a closed cell cellular material. he may in particular be a polyethylene, polyester or polyurethane.

Preferably, in the second position, said first separation 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 separation member is preferably placed inside a passage formed between the first and second compartments and is, prior to said overpressure, held in said first position, by partial compression in at least one direction transverse to said passage, in contact with an internal surface delimiting said passage passage. Despite this slight compression of the separating member, the air can pass between the lateral surface of the separating member and the internal surface of the passage, thus authorizing the achievement of the pressure balance.

At pressure balance, the pressure of the first compartment and the second compartment, are substantially identical and each in overpressure relative to the initial pressure of these compartments. The separation organ disposed between these two compartments is in fact compressed in at least two opposite directions, for example pressure is applied to at least two opposite faces of this organ coming into contact with the internal 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 deformable elastically so as to be able to generate said overpressure in response to a pressure exerted, laterally or axially, on said deformable wall elastically.

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

Alternatively, the compartment inside which the overpressure is generated is delimited by a container with elastically compressible walls. In that 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, suitable for being mounted on the first, in particular by screwing or snap.

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

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

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

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 can be made up:

i) on the one hand, a portion of the stopper; and

ii) on the other hand, an axial stop located on the side of the first separation member opposite the plug.

So, as long as the cap is in place on the second container, it immobilizes axially the separation member. Once the cap is removed, when positioning of the second container above the first, the second product is retained inside the second container by the separation member.

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

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

According to another embodiment, the device forms a third compartment able to be arranged at least partly above the second and containing a third product, said first, second and third products being isolated two to two by said first separation member and by a second separation member separation, said first and second separation members being able to pass each of a first position in which they isolate two by two said ones 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, at the sensitive balance of pressures between the compartments they separate respectively, of a multidirectional volume reduction of said first and second separation member in response to an overpressure generated inside one and / or the other of said first, second and third compartments.

Preferably, the mixing is carried out 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 can be packaged separately one from the other, in the same container, in particular in an applicator tip.

Advantageously, the product (s) contained in the (or them) compartment (s) other than the one inside which said generator is generated overpressure, is (are) in powder form. So the first product can be an oxidant in liquid form. The second product can be a dye in the form of a powder. The third product may be a perfume composition, under also forms a powder.

According to another aspect, the present application relates to a device for extemporaneous mixture of at least two products, the device forming a first compartment containing a first product and a second compartment, suitable for be arranged at least partly above the first, and containing a second product, a first separation member being able to pass 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 so that the passage of the first separating member from the first position to the second results from an overpressure generated in one either of said first and second compartments, said first member of separation, when moving from the first position to the second, is moving towards the compartment inside which the overpressure.

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

• 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 set out above, of 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 stages of operation 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 stages of operation of the device of FIG. 4.

The device 1 shown in Figures 1 and 2 comprises a container 2, one of which end ends with a bottom 3. Part 4 of the container body, adjacent at the bottom 3, is configured in the form of a bellows. 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 in a threaded neck 5 delimiting an opening 6.

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

In the storage and / or transport position of the device 1, the container 2 is closed by a plug 7, the internal surface of which includes a thread capable of cooperating with the threading of the neck 5. Conventionally, the plug 7 comprises a skirt seal 8.

The device 1 also includes an applicator tip 10.

The applicator tip 10 consists of a hollow element of elongated shape, of which a portion 11 is of cross section gradually decreasing in the direction an opening of small section 19, closed by a self-breaking tip 40.

Near its end opposite to the self-breaking tip 40, the tip applicator 10 comprises a first cylindrical portion 13, of diameter greater 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 end piece applicator 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 an opening 45 for the applicator tip 10.

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

The internal surface of the second cylindrical portion 15 has a thread 17. Inside the cylindrical portion 15, a sealing skirt 18 is formed, extending axially from the shoulder 16, towards the end of the end piece 10, opposite the self-breaking end piece 40.

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

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

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

During storage and / or transport, the end of the end piece 10 is closed by a plug 30, an outer surface of which has a thread 31 capable of cooperating with the thread 17 of the end piece 10. A transverse wall 32 of the plug 30 is arranged so as to come substantially into contact with the surface 22 of the block of foam, opposite surface 21.

An outer wall 33, concentric with the annular wall on which the thread 31, allows manipulation of the plug 30.

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

In FIG. 3A, the container 2 has been freed from its cap 7. The end piece 10 a been removed from its cap 30. Even in the head-up position, the block of foam 20 holds by slight compression inside the cylindrical part 13 of the tip 10, despite the weight of the powder which is therefore retained at inside the housing 12.

In FIG. 38, the end piece 10 is screwed onto the container 2.

In FIG. 3C, an axial pressure is exerted on the bottom 3 of the container 2 of so as to axially compress the part 4 forming a bellows. This results in a overpressure inside the container 2. Due to the lack of airtightness all around the foam block 20, the pressures balance between the housing 9 and the housing 12. As a result, the overpressure is exerted substantially uniform over the entire outer surface of the foam block 20. This is compresses multidirectionally. This results in particular in a reduction of its outside diameter, sufficient so that it is no longer retained inside 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 Figure 3D, the two products are mixed inside the container 2. The block of foam 20 floats on the surface of the mixture. The mixture can be homogenized by shaking the device 1 adequately.

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

In FIG. 3F, the mixture is applied in a conventional manner to the hair in using the bellows portion 4 to precipitate the exit of the mixture via opening 19.

i) de prévoir 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 one wishes to use the device which has just been described with two liquids, it may be advantageous:

i) providing on the internal surface of the shoulder 14, an annular rib (not shown), so as to reduce the risks of formation, before use of the device, of a liquid film between the lateral surface of the foam block 20 and the internal surface of the cylindrical portion 13; and

ii) making the mixture in the head-down position of the device, the material forming the foam block 20 having a density less than that of the liquid contained in the container 2.

i) le récipient 2 est à parois déformables élastiquement en réponse 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 has 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 nozzle 10 has another cylindrical portion 41, of internal diameter slightly less 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 arranged a block of foam 50 similar to the foam block 20, and one face 51 of which is in axial abutment against the shoulder 42. Thus, in the mounted position of the applicator tip 10 on the container 2, the foam block 20 separates the compartment 9 delimited by the container 2 compartment 12 formed in the lower part of the applicator tip 10. The foam block 50 separates compartment 12 from a compartment 43 formed in the upper part of the applicator tip. Compartment 9 contains a coloring oxidant in liquid form. The 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 mode of previous achievement. Therefore, its detailed description will not be repeated here.

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

The rest of the process is illustrated with reference to Figures 5A-5D in which it is now refers.

In FIG. 5A, the compartment 9 is pressurized in response to a pressure exerted transversely on the deformable walls of the container 2. This results an overpressure inside the container 2. Due to the lack of air tightness all around the foam block 20 and the foam block 50, the pressures balance almost instantaneously between the housings 9, 12, and 43. From this in fact, the overpressure is exerted in a substantially uniform manner over the entire the outer surface of the foam blocks 20 and 50. These compress from multidirectionally. In particular, this results in a reduction in their outside diameter, sufficient so that they are no longer retained inside 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 the housings 12 and 43.

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

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

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

In FIG. 5D, the mixture is applied in a conventional manner to the hair in compressing the deformable body of container 2 to precipitate the exit of the mixture via opening 19.

In the foregoing detailed description, reference has been made to modes of preferred embodiments of the invention. Obviously there may be variations made without departing from the spirit of the invention as claimed below.

Claims (22)

Device (1) for packaging at least one product, in particular a cosmetic product, the device comprising: i) at least one compartment (9, 12) intended to contain said product; ii) a member (20), at least partially resiliently compressible, disposed in a passage (13) of the device; and iii) means (2, 3) for, in response to a manual actuation command, generating a fluidic overpressure which, on at least part of the elastically compressible member (20), is applied in at least two directions opposite, so as to cause a reduction in volume of the compressible member to at least partially clear said passage. Device (1) according to claim 1 characterized in that : a) the device forms a first compartment (9) containing a first product and a second compartment (12), capable of being arranged at least partially above the first, and containing a second product; b) said elastically compressible member forms a first separation member (20), capable of passing 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 so that the passage of the first separation member (20) from the first position to the second results, at a substantial pressure balance between the first and second compartments, from a reduction in volume of said first separation member (20) in response to an overpressure generated inside one and / or the other of said first and second compartments (9, 12). Device (1) according to claim 1 or 2 characterized in that the reduction in volume of the compressible member (20) results at least in a reduction in the area of a cross section to the axis of the passage (13) , of said elastically compressible member (20). Device (1) according to claim 2 or 3 characterized in that it is configured in such a way that the passage of said first separation member (20) from the first to the second position results from an overpressure generated in the first compartment (9) when the latter is below the second (12), the level of the first product in the first compartment (9) being such that the transition from the first to the second position takes place before the first product comes in contact with said first separation member (20). Device (1) according to any one of claims 1 to 4 characterized in that the elastically compressible member (20) has an external surface which, at least in part, is impermeable. Device (1) according to claim 5 characterized in that the elastically compressible member (20) is, at least in part, formed of a closed cell cellular material. Device (1) according to claim 6 characterized in that the closed cell foam material is a polyethylene, polyester or polyurethane foam. Device (1) according to claim 2 and any one of claims 3 to 7 characterized in that , in the second position, said first separation member (20) floats on the surface of the mixture. Device (1) according to claim 2 and any one of claims 3 to 8 characterized in that the first separation member (20) is arranged inside a passage (13) 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 internal surface delimiting said passage. Device (1) according to any one of Claims 1 to 9, characterized in that at least one of the walls delimiting said compartment (9, 12) or one of said compartments is elastically deformable so as to be able to generate said overpressure in response to a pressure exerted, laterally or axially, on said elastically deformable wall. Device (1) according to any one of claims 1 to 10 characterized in that at least a part (4) of said compartment (9, 12) or of one of said compartments forms bellows. 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, in particular by screwing or snap-fastening. Device (1) according to claim 12 characterized in that the second container (10) has an opening (45) which, when said first separation member (20) is in the first position, is isolated from the second product by said first member separation (20). Device (1) according to claim 13 characterized in that said opening (45), prior to mounting the second container on the first, is closed in a removable manner by closing means (30), in particular in the form of a plug, in particular screwed. Device (1) according to claim 13 or 14 characterized in that means (14, 32) are provided for, prior to mounting the second container (10) on the first (2), maintain said first separation member in a fixed position (20). Device (1) according to claim 15 characterized in that said immobilization means are constituted i) on the one hand, a portion (32) of the plug (30); and ii) on the other hand, an axial stop (14) located on the side of the first separation member (20) opposite the plug (30). 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) forming an application nozzle for mixing said products. Device (1) according to claim 17 characterized in that the second compartment is able to communicate with a dispensing orifice (19) which, prior to mixing, is closed by a closure member (40), in particular in the form of a self-breaking element. 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 arranged at least partly above the second (12), and containing a third product, said first, second and third products being isolated in pairs by said first separation member (20) and by a second separation member (50), said first and second separation members (20, 50) being able to pass each from a first position in which they isolate two by two said first, second, and third products, to a second position in which the three products are brought into contact with each other, the passage of the first and second member for separating from the first position to the second resulting in a substantial pressure balance between the two compartments which they isolate respectively, from a multidirectional volume reduction of said first and second separation member (20, 50) in response to an overpressure generated inside one and / or the other of said first, second, and third compartments (9, 12, 43). Device (1) according to claim 2 and any one of claims 3 to 19 characterized in that the (or the) product (s) contained (s) in the (or) compartment (s) (12, 43) other (s) than that (9) inside which said overpressure is generated, is (are) in powder form. 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 arranged at least partly above the first, and containing a second product, a first separation member (20) being able to pass from a first position in which it isolates the first product from the second to a second position in which the first product is placed contact with the second, the device being configured so that the passage of the first separation member (20) from the first position to the second results from an overpressure generated in one or the other of said first and second compartments, said first separation member (20), during its passage from the first position to the second, moving towards the compartment inside which the overpressure is generated. Use of a device (1) according to any one of the claims which above for the production of a mixture intended to form a composition cosmetic, in particular for hair coloring.

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