EP1510472A1 - Pouch and package with a pouch - Google Patents

Abstract

The container/dispenser (1) consists of a flask (2) with an inner deformable pouch (5) for the product made from two layers (6, 7) of the same material or different materials, joined together by a direct physico-chemical reaction. Each of the layers of the pouch has at least 80 per cent of its mass made from one or more components of the same chemical family. The container/dispenser (1) consists of a flask (2) with an inner deformable pouch (5) for the product made from two layers (6, 7) of the same material or different materials, joined together by a direct physico-chemical reaction. Each of the layers of the pouch has at least 80 per cent of its mass made from one or more components of the same chemical family. The pouch can have a filler to make it colored or opaque for easy detection, and the layers can be coextruded or made by extrusion blowing; they can also be coextruded with the flask.

Description

The present invention relates to a packaging device in composite plastic material having increased sealing characteristics. She finds more particularly its use in the field of the devices of conditioning of sensitive cosmetic products, of liquid consistency to pastes, such as coloring and / or discolouring oxidants, creams of care, or sunscreens, which should not be in contact with air than when they are used. Indeed, the contact with the air generates reducing reactions degrading said cosmetics, which makes them ineffective at the time of their use.

To distribute such sensitive cosmetic products under conditions Optimal use is usually made of devices with a bottle inside of which is disposed a deformable inner bag, the product being stored at inside the pocket. Preferably, these devices are then equipped with means for dispensing the product without air intake. There is therefore a need to make internal pockets both flexible and waterproof. To guarantee a some flexibility to these pockets generally made of plastic material, they are generally fine.

For example, the teaching of document WO-93 / 22,220 is known. product dispenser with deformable pocket, the pocket being inserted a posteriori in the bottle, the bag being previously formed by welding edges a longitudinal band on itself. The internal pocket being made separately from the vial, its seal may be tested before it is arranged in the bottle. But this embodiment has the disadvantage to be long and tedious to implement.

With such bottles, in which the internal pocket is reported subsequently, pockets may be provided whose wall is formed by a complex structure, at least three-layer. The complex structure then forms a laminated laminated material having an impermeable first layer in a first material, for example polyethylene, and a second layer impermeable material made of a second material, for example polyamide, distinct from the first material. The two layers are then glued to each other by means of a third uniform and intermediate layer of binder or glue to allow adhesion between these two first layers. This structure complex is then cut into panels, the panels being then assembled together to form said pocket.

At present, the majority of packaging: tubes or flasks, used in particular in cosmetics, are made of thermoplastic material. Generally, polyolefins are used, which are recyclable and are not polluting. In general, the polyolefin packages are prepared by extrusion, more particularly by extrusion blow molding, as taught in US-4,179,251.

In particular, it is known from the state of the art a coextrusion process blowing to obtain a bottle and its internal pocket simultaneously, in particular described by EP-0,182,094. According to this document, the bottle is made PVC and the inner pocket is made of polyethylene.

Polyolefins have good impermeability properties to gases and water vapor and have the advantage of being compatible with most products chemical.

However, the polyolefin packaging obtained can exhibit the disadvantage of having micro-holes. By micro-hole, we mean a hole such as the impermeability of a surface in which it is made is no longer ensured locally and brutally, with respect to the overall impermeability of the said area. Indeed, when the packages are made by extrusion blow molding, micro-holes, caused by impurities in the plastic at moment of its transformation, appear. The appearance of these micro-holes is all the more important as the thickness of the wall made is fine.

To overcome leakage problems, in the state of the art, it is known to increase the thickness of the wall at the expense of the flexibility of the pocket internal thus formed.

Preferably, in the invention, it is sought to manufacture such a device according to a manufacturing process, simple, easy to implement and inexpensive, preferably using the same manufacturing process to form the bottle and the internal pocket of the device.

The use of the same manufacturing process makes it possible to simplify manufacturing operations, on the other hand, makes it more difficult to achieve production quality control tests. Indeed, the internal pocket being already inside the bottle at the exit of the manufacturing machine, it is impossible to test the bottle and the bag separately, without losing the advantage of being able to to manufacture these two elements by the same method.

A leak test of a pocket consists in placing the cavity in an overpressure formed by the pocket, and then to measure, after a determined period of time, the variation of the pressure inside the pocket. If no decrease in inner pressure of the pocket is observed, then the pocket is considered as not fleeting. The problem with performing this type of testing is that they do not allow effective detection of leaks.

Indeed, when the inner bag of a bottle is placed in overpressure, it then sticks tightly around the inside of the bottle, inside which it was made. So if a micro-hole of this pocket is plated locally against the inside perimeter of the vial, during the test period, the inner circumference of the bottle will close this micro-hole and the micro hole will not be detected. If such leakage tests are performed on the internal pockets in situ, the reliability of such tests is very low.

The subject of the invention is a packaging device for which the bottle and the inner bag may in particular be obtained by the same method, and such that one can dispense with the need to test the tightness of the internal pocket, by choosing a structure of this inner layer to guarantee it the absence of micro-holes.

Preferably, the process for obtaining the bag and the bottle is extrusion blow molding. The pouch being flexible, to allow a retraction of the pocket on itself, inside the bottle, it is imperative that during the manufacturing process, there is no adhesion between the inner wall of the bottle and the outer wall of the pocket. For this purpose, the bottle is made in a first material, and the inner pocket is made of a second material. The first material is incompatible with the second material. So during cooling of these materials, the inner bag does not adhere to the bottle.

The innovative structural feature of the pocket is to provide pocket whose wall comprises at least two layers contiguous to each other, without intermediate binder or glue, to stay both simple while guaranteeing the absence of micro-holes.

Indeed, if one or both layers have one or more micro-holes, because of its extrusion manufacturing, the probability that a hole in a first layer facing a hole in the second layer is almost zero. The pocket thus made in double thickness, from one or more materials of a single chemical family, therefore does not include a through hole. This guarantee avoids the risk of leakage on finished products. Moreover, this guarantee facilitates leak testing because only large leaks are likely to occur and only need to be detected. The tests for the detection of micro-leaks, difficult to achieve during a production cycle, can be suppressed, which overall improves the coextrusion process from the pocket into the bottle.

• un flacon, et
• une poche interne disposée à l'intérieur du flacon et apte à contenir ledit produit, la poche étant librement déformable à l'intérieur du flacon,

   caractérisé en ce que la poche interne comporte :

i) soit au moins deux couches (6, 7) réalisées en un même matériau et accolées l'une à l'autre par réaction physico-chimique directe entre les matériaux desdites au moins deux couches ;

ii) soit des première et seconde couches (6, 7), réalisées en au moins deux matériaux différents, physico-chimiquement compatibles entre eux, la première couche (6) étant au contact du produit, la seconde couche (7) définissant la paroi extérieure de la poche, les première et seconde couches étant accolées l'une à l'autre par réaction physico-chimique directe entre le matériau de la première couche et le matériau de la deuxième couche.

The subject of the invention is a device for packaging a product, in particular a cosmetic product, comprising

• a bottle, and
• an inner bag disposed inside the bottle and adapted to contain said product, the bag being freely deformable inside the bottle,

characterized in that the inner pocket comprises:

i) at least two layers (6, 7) made of the same material and contiguous to each other by direct physicochemical reaction between the materials of said at least two layers;

ii) or first and second layers (6, 7), made of at least two different materials, physico-chemically compatible with each other, the first layer (6) being in contact with the product, the second layer (7) defining the wall outside the pocket, the first and second layers being joined to each other by direct physicochemical reaction between the material of the first layer and the material of the second layer.

In the invention, by physico-chemically compatible materials, includes materials that when brought into contact with each other in the state melted, are able to create physico-chemical bonds that produce adhesion of the two materials with each other. Thus, the cohesion of the layers between them is de facto provided, and the integrity of the pocket is thus obtained.

By a direct physico-chemical reaction, it is understood that the reaction produced between the materials, under given conditions of temperature and pressure, allows the joining and the adhesion of the layers between them, the layers being respectively formed from each of these materials. The reactions direct physicochemicals exclude reactions requiring the implementation of a binder between the materials. In particular, the physicochemical reactions have at temperatures close to the melting temperatures of different materials. It is then a matter of heat-sealing or thermofusion of the materials of the different layers between them.

When the reaction is complete, all the layers are brought back to ambient temperature, around 25 ° C, where it can be seen that the layers thus assembled are integral with each other.

Preferably, the internal pocket comprises only layers made of the same material and directly attached to each other.

Advantageously, each of the two layers comprises at least 80% of its mass represented by the same compound or several compounds of a same chemical family, in all cases the compound (s) chosen for the realization of each of these layers belongs (s) all to the same family chemical.

By "chemical family" is meant a group of molecules characterized by the presence of a particular chemical function on each of the molecules of the group.

In this case, and because the first layer is made from a compound of the same chemical family as that of the compound used to form the second layer, the two layers are physico-chemically compatible between them and adhere perfectly to each other. They remain welded one to the other to form, after cooling, the wall of the inner pocket.

Advantageously, said chemical family is chosen from one of chemical families of thermoplastic polymers: the family of polyolefins, the polyvinyl chloride family and their derivatives, the family of styrenics, the family of polyoxymethylenes, the family of polyamides, the family saturated polyesters, the family of polycarbonates, the family of polymers sulfonates, the polyphenylene oxide family, the cellulosic family, and the family of polyurethanes.

According to a preferred embodiment, the two coextruded layers of the internal pocket are made from the same compound, representing more than 80% of their mass. This same compound is for example from the family of polyamides, and in this case, preferably polyamide 11.

Alternatively, the two coextruded layers of the inner pocket are each made from two distinct compounds, nevertheless derived from the same chemical family. For example, a first layer of this inner pocket comprises at least 80% of a compound of the family of polyamides, for example polyamide 6,6, whereas a second layer of this inner pocket comprises it, at least 80% of another compound of this family of polyamides, by example the polyamide 11.

In particular, one of the layers forming the internal pocket has a charge, colored or not, so as to color or opaque said layer of the internal pocket. This change in the appearance of one of the layers makes it possible forming a presence detection means of the inner bag in the bottle. The pocket, if it is colored, is easier to detect by cameras installed on the production line and whose images are analyzed in real time on the line of production. Alternatively, adjuvants or other molecules with properties antistatic, for example, can be incorporated in the composition of said layers. Additives can represent up to 20% by weight of the composition of each of the layers of the inner pocket.

Another advantage of placing the coloring filler, or any other type of additive, in only one of the layers of the pocket is to save on the amount of coloring filler or additive to be used.

Preferably, the coloring filler and / or additives are incorporated into the composition of the inner layer of the pocket, which layer does not come in contact with the inner wall of the bottle, said inner layer being able to come possibly in contact with the product to be stored. This provision allows for to avoid interference with the inner wall of the bottle, and in particular avoids the phenomena of adhesion, not sought, and only caused by the presence of these additives or dyes.

For example, the layers of the pocket are coextruded. Preferably, the internal pocket is obtained by an extrusion blow molding process. Advantageously, the inner bag and the bottle are coextruded simultaneously through the same extrusion blow molding process.

In particular, the bottle may also be made of a material having at least one compound of one of the chemical polymer families thermoplastics mentioned above. In this case, it is made from one or several compounds from chemical families different from that within which more than 80% by weight of the constituent compound (s) the internal pocket.

Advantageously, the bottle is made from a material having a low adhesion with an outer layer of the inner pocket, especially when of the extrusion blow molding process, to guarantee the non-adhesion between the layer outer of the inner pouch and an inner wall of the vial.

For example, the vial can be made from a compound selected in the family of polyolefins, and the pocket is then made from one or more compound (s) chosen from the family of polyamides. In particular, the bottle can be made of high-density polyethylene, and at least one of the layers of the inner bag with at least 80% by mass of polyamide 11.

Preferably, the wall of the inner pocket has a thickness of between 1 / 10th and 3 / 10th of a millimeter. The thicknesses of the different layers may be equal to each other, or different, and in the latter case the outer layer is usually thicker than the inner layer.

Advantageously, the internal pocket has an opening arranged so that it is circumscribed in the opening of the bottle. The product can be inserted and removed from the device through these openings. Preferably, the product is stored in the internal pocket.

According to a preferred embodiment of the invention, the device is provided with a dispensing means, for example of the type of pumps without air intake, generally called "airless" pumps. These pumps without air intake are widely used, particularly in the field of cosmetics for distribution of skincare products as a single phase, generally liquid, including body milks, moisturizers or sunscreen. Such distributors are particularly advantageous in that they allow in particular to keep the product isolated from the air. Because of their instability in the presence of air, staining and / or discolouration products capillary can be advantageously distributed by such pump systems without air intake. The pump may be of the piston, membrane or valve type. Such pumps are well known, and therefore do not require any additional detailed description.

With each new operation of such a pump without air intake, the volume of the bottle pocket on which it is mounted decreases by one corresponding to the volume of the dispensed dose, so that the product occupies, throughout the life of the device, substantially the entire volume available from the internal pocket. For this purpose, the bottle has a recovery port of air so that the outer periphery of the inner pocket is always subject to ambient pressure.

Alternatively, the device is simply provided with a plug for sealingly and hermetically sealing said openings of the inner pocket and the bottle. In particular, in the case where the distribution means is to be mounted on said openings only before use, and after introducing other compositions inside the bottle, and or the inner bag, a stopper is then planned for the storage phase of the device.

Advantageously, the product is intended to contain a product of the type of skin care products and or hair.

i) soit au moins deux couches (6, 7) réalisées en un même matériau et accolées l'une à l'autre par réaction physico-chimique directe entre les matériaux desdites au moins deux couches ;

ii) soit des première et seconde couches (6, 7), réalisées en au moins deux matériaux différents, physico-chimiquement compatibles entre eux, la première couche (6) étant au contact du produit, la seconde couche (7) définissant la paroi extérieure de la poche, les première et seconde couches étant accolées l'une à l'autre par réaction physico-chimique directe entre le matériau de la première couche et le matériau de la deuxième couche.

It is another object of the invention to provide a flexible bag capable of containing a product, in particular a cosmetic product, characterized in that the bag comprises:

i) at least two layers (6, 7) made of the same material and contiguous to each other by direct physicochemical reaction between the materials of said at least two layers;

ii) or first and second layers (6, 7), made of at least two different materials, physico-chemically compatible with each other, the first layer (6) being in contact with the product, the second layer (7) defining the wall outside the pocket, the first and second layers being joined to each other by direct physicochemical reaction between the material of the first layer and the material of the second layer.

Preferably, the flexible pouch has only layers made of the same material and directly attached to each other.

Advantageously, the at least two layers are adjacent, such as each of the two layers each comprise at least 80% of their mass represented by the same compound or several compounds of the same family the compound (s) chosen for the realization of these at least two layers belonging to the same chemical family.

Advantageously, the chemical family is chosen from one of the following thermoplastic polymer chemical families: the family of polyolefins, the polyvinyl chloride family and their derivatives, the family of styrenics, the family of polyoxymethylenes, the family of polyamides, the family saturated polyesters, the family of polycarbonates, the family of polymers sulfonates, the polyphenylene oxide family, the cellulosic family, and the family of polyurethanes.

Advantageously, the two layers are made from a same compound, for example from the family of polyamides, in particular the polyamide 11.

Preferably, a first layer of the pocket is made from a compound of the family of polyamides, for example polyamide 6,6, and a second layer of said pocket is made from a compound different from this same family of polyamides, for example polyamide 11.

For example, one of the layers forming the inner pocket may comprise a filler, colored or otherwise, so as to color or make said layer opaque of the flexible pouch.

Advantageously, the flexible pouch forms a wall of a thickness between 1/10 ^th and 3/10 ^th of millimeters, which notably guarantees its flexibility.

Preferably, the bag is obtained by a method of extrusion blow molding.

• un flacon, et
• une poche interne disposée à l'intérieur du flacon et apte à contenir ledit produit, la poche étant librement déformable à l'intérieur du flacon,

   caractérisé en ce que la poche interne comporte plusieurs couches réalisées dans des matériaux différents et physico-chimiquement compatibles entre eux tels que chacune des couches est apte à être accolée à n'importe quelle autre couche de la poche par réaction physico-chimique directe entre lesdits matériaux constituant respectivement chacune de ces couches.Alternatively, the subject of the invention is also a device for packaging a product, in particular a cosmetic product, comprising

• a bottle, and
• an inner bag disposed inside the bottle and adapted to contain said product, the bag being freely deformable inside the bottle,

characterized in that the inner bag comprises several layers made of different materials and physico-chemically compatible with each other such that each of the layers is capable of being contiguous to any other layer of the pocket by direct physico-chemical reaction between said materials respectively constituting each of these layers.

• un flacon, et
• une poche interne disposée à l'intérieur du flacon et apte à contenir ledit produit, la poche interne étant librement déformable à l'intérieur du flacon,

   caractérisé en ce que la poche interne comporte au moins des première et seconde couches, la première couche étant réalisée dans un premier matériau différent d'un deuxième matériau constituant la deuxième couche, les premiers et deuxièmes matériaux étant non adhésifs et physico chimiquement compatibles entre eux tels que les première et seconde couches sont accolées l'une à l'autre par réaction physico-chimique directe entre le matériau de la première couche et le matériau de la deuxième couche.According to another variant, the subject of the invention is also a device for packaging a product, in particular a cosmetic product, comprising

• a bottle, and
• an inner bag disposed inside the bottle and adapted to contain said product, the inner bag being freely deformable inside the bottle,

characterized in that the inner bag has at least first and second layers, the first layer being made of a first material different from a second material constituting the second layer, the first and second materials being non-adhesive and physico chemically compatible with one another such that the first and second layers are joined to each other by direct physicochemical reaction between the material of the first layer and the material of the second layer.

A material is considered adhesive when it is able to ensure a connection between two physico-chemically incompatible materials with each other, because of their polar or apolar nature, or because of the absence in each said group materials capable of creating chemical bonds with each other.

• Figure 1 : un dispositif selon l'invention dans un premier mode de réalisation;
• Figure 2 : un dispositif selon l'invention dans un deuxième mode de réalisation.

The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These are presented only as an indication and in no way limitative of the invention. The figures show:

• Figure 1: a device according to the invention in a first embodiment;
• Figure 2: a device according to the invention in a second embodiment.

Figure 1 shows a device 1 according to the invention. Device 1 comprises a substantially cylindrical bottle 2 of axis X. The bottle 2 is made of polyethylene. The bottle 2 has an opening 3 orthogonal to the X axis. bottle 2 is surmounted by a distribution means 4 of a product P contained in an inner bag 5 disposed inside the bottle 2.

The inner pocket 5 is flexible wall and deformable. It has a first inner layer 6 in contact with the product, and a second layer 7 which can possibly be brought into contact with the inner wall 8 of the bottle 2. The inner 6 and outer layers 7 are made in a same material, for example polyamide.

The two layers 6 and 7 are perfectly contiguous and apart from their formation in two layers, the existence of a joint plane between these two layers remains invisible to the naked eye because they are each performed simultaneously, in the same material and in the absence of a binder interposed between these layers. In the case where one of the layers has a coloring charge, then the plane of seal is visible in a cross-sectional view of the wall of the pocket. Alternatively, a joint plane can also be detected by means of a microscope during an analysis of a transverse sectional plane of the wall.

Alternatively, the pocket 5 can be made by joining together a plurality of layers of the same material.

Alternatively, the pocket 5 may comprise three layers, two of them being made of an identical material so that a layer intermediate between these two identical layers is carried out in a physico-chemically compatible material and able to react directly with these two layers. For example, the pocket 5 has two layers of polyamide 6.6 between which is disposed a layer of polyamide 11. As a variant again, the pocket 5 may comprise a first layer of low density polyethylene confined by direct physicochemical reaction to a layer of high polyethylene density itself contiguous by direct physicochemical reaction to a layer of polypropylene. In this structure, the low-density polyethylene chosen could also be able to react physico-chemically directly with the polypropylene. In this structure, the different layers are each physico-chemically compatible respectively in pairs with others layers.

An opening 9 of the bag 5 is circumscribed in the opening 3 of the bottle 2. For example, the pocket 5 has a border 10 falling over a periphery 11 of the opening 3. The bottle 2 preferably comprises a collar 12 defining in particular said opening 3. According to Figure 1, the neck 12 is threaded to retain the 4. Alternatively, as shown in FIG. 2, the collar 12 is also threaded to receive a cap 13 able to ensure sealing shutter the opening 3 of the bottle 2 and the opening 9 of the bag 5.

In the example shown in FIG. 1, the distribution means 4 is a pump having an actuating surface 14 perpendicular to the X axis, a nozzle 15 of the pump orienting a jet of product along an orthogonal trajectory to the X axis.

In particular, a pump is mounted without air intake on the device 1. In this case, at each distribution of a dose of product P, the internal volume of the inner bag 5 decreases by a volume equal to that of the dispensed dose. For allow such a retraction of the pocket 5 on itself, the bottle 2 comprises an air intake port 16. Through this orifice 16, the outer periphery 17 of the inner pocket 5 is always subjected to atmospheric pressure, and the pocket internal 5 can thus be drained as and when by the pump 4 without air intake.

Nevertheless, other types of distribution means may be considered in the context of the present invention.

The dispensing means 4 optionally comprises a dip tube T, in depending on the filling mode, whether or not the product P is empty in the pocket internal 5.

In the example shown in FIG. 1, the pump 4 is screwed, but it can alternately to be slammed, crimped or strengthened.

For example, when the product P in pocket 5 must previously mixed with another composition before being distributed, then the device 1 is initially closed by the plug 13, and only after realization of said mixture, a dispensing means such as 4 is mounted on the neck 12. In this case, the pump delivered separately from device 1 is intended to be for example screwed around the neck 12, instead of the plug 13 obturator initially the bottle 2.

In the example presented in FIG. 1, the pocket 5 is closed at a level 18. At this level, the materials of the bottle 2 and the pocket 5 being incompatible, an opening is maintained, it can for example play the role of the air intake port 16.

Of course, the invention is not limited to the examples that come to be described, and in particular the characteristics of the various embodiments.

Throughout the description, including the claims, the expression "Comprising two" must be understood as being synonymous with "comprising at least two ", unless the opposite is specified.

Claims (28)

Device (1) for packaging a product (P), in particular a cosmetic product, comprising a bottle (2), and an inner bag (5) disposed inside the bottle and adapted to contain said product, the bag being freely deformable inside the bottle, characterized in that the inner pocket comprises: i) at least two layers (6, 7) made of the same material and contiguous to each other by direct physicochemical reaction between the materials of said at least two layers; ii) or first and second layers (6, 7), made of at least two different materials, physico-chemically compatible with each other, the first layer (6) being in contact with the product, the second layer (7) being in contact with each other; a space defined between the pocket and an inner wall of the flask, the first and second layers being contiguous to each other by direct physicochemical reaction between the material of the first layer and the material of the second layer. Device according to claim 1 characterized in that the inner pocket has only layers (6, 7) made of the same material and directly contiguous to each other. Device according to claim 1 or 2 characterized in that each of the layers each comprises at least 80% of their mass represented by the same compound or several compounds of the same chemical family, the compound (s) chosen (s) for the realization of these at least two layers belonging to the same chemical family. Device according to Claim 3, characterized in that the chemical family is chosen from one of the following chemical families: the family of polyolefins, the family of polyvinylchlorides and their derivatives, the family of styrenics, the family of polyoxymethylenes, the family polyamides, the family of saturated polyesters, the family of polycarbonates, the family of sulfonic polymers, the polyphenylene oxide family, the family of cellulosics, and the family of polyurethanes. Device according to one of claims 1 to 4 characterized in that the two layers are made from the same compound, for example from the family of polyamides, in particular polyamide 11. Device according to one of claims 1 to 4 characterized in that a first layer of the bag is made from a compound of the family of polyamides, for example polyamide 6,6, and a second layer of said pocket is made from a compound different from this same family of polyamides, for example polyamide 11. Device according to one of claims 1 to 6 characterized in that one of the layers forming the inner bag comprises a charge, colored or not, so as to color or to make opaque said layer of the inner bag, so as to form means for detecting the presence of the internal bag in the bottle. Device according to Claim 7, characterized in that an inner layer (6) of the inner pocket comprises the said charge, colored or not, Device according to one of claims 1 to 8 characterized in that the layers of the inner bag are coextruded. Device according to one of claims 1 to 9 characterized in that the inner bag is obtained by a method of extrusion blow. Device according to one of claims 1 to 10 characterized in that the inner bag and the bottle are coextruded. Device according to one of claims 1 to 11 characterized in that the bottle is made from a material having a low adhesion with an outer layer (7) of the inner bag, especially during the extrusion blow molding process, for guaranteeing non-adhesion between the outer layer of the inner bag and an inner wall (8) of the bottle. Device according to one of claims 1 to 12 characterized in that the flask is made from a compound selected from the family of polyolefins, and the bag is made from one or more compound (s) chosen (s) ) in the family of polyamides. Device according to one of claims 1 to 13 characterized in that the inner pocket forms a wall with a thickness between 1/10 ^th and 3/10 ^th of millimeters. Device according to one of claims 1 to 14 characterized in that an opening (9) of the bag is circumscribed in an opening (3) of the bottle. Device according to one of claims 1 to 15 characterized in that it comprises a dispensing means (4) of the product contained in the pocket, including the type of pumps without air intake. Device according to one of claims 1 to 15 characterized in that it comprises a plug (13) for closing an opening (9) of the pocket. Device according to one of claims 1 to 17 characterized in that the product contained is a care product of the skin and or hair. Flexible pouch (5) adapted to contain a product, especially a cosmetic product, characterized in that the bag comprises: i) at least two layers (6, 7) made of the same material and contiguous to each other by direct physicochemical reaction between the materials of said at least two layers; ii) or first and second layers (6, 7), made of at least two different materials, physico-chemically compatible with each other, the first layer (6) being in contact with the product, the second layer (7) defining the wall outside the pocket, the first and second layers being joined to each other by direct physicochemical reaction between the material of the first layer and the material of the second layer. Device according to claim 19 characterized in that the flexible pouch has only layers (6, 7) made of the same material and directly contiguous to each other. Pocket according to claim 19 characterized in that it comprises at least two adjacent layers (6, 7), each of the two layers each comprising at least 80% of their mass represented by the same compound or several compounds of the same chemical family , the compound (s) chosen (s) for the realization of these at least two layers belonging to the same chemical family. Pocket according to claim 21, characterized in that the chemical family is chosen from one of the following chemical families of thermoplastic polymers: the family of polyolefins, the family of polyvinyl chloride and their derivatives, the family of styrenics, the family of polyoxymethylenes , the family of polyamides, the family of saturated polyesters, the family of polycarbonates, the family of sulfonic polymers, the family of polyphenylene oxide, the family of cellulosics, and the family of polyurethanes. Pocket according to one of claims 19 to 22, characterized in that the two layers are made from the same compound, for example from the family of polyamides, in particular polyamide 11. Pocket according to one of claims 19 or 23 characterized in that a first layer of the bag is made from a compound of the family of polyamides, for example polyamide 6,6, and a second layer of said pocket is made from a compound different from this same family of polyamides, for example polyamide 11. Pocket according to one of claims 19 to 24 characterized in that one of the layers forming the inner bag comprises a charge, colored or not, so as to color or to make opaque said layer of the flexible bag. Pocket according to one of claims 19 to 25 characterized in that the flexible pouch forms a wall with a thickness between 1/10 ^th and 3/10 ^th of millimeters. Pocket according to one of claims 19 to 26 characterized in that it is obtained by an extrusion blow molding process. Device (1) for packaging a product (P), in particular a cosmetic product, comprising a bottle (2), and an inner bag (5) disposed inside the bottle and adapted to contain said product, the bag being freely deformable inside the bottle, characterized in that the inner bag comprises several layers made of different materials and physico-chemically compatible with each other such that each of the layers is capable of being contiguous to any other layer of the pocket by direct physico-chemical reaction between said materials respectively constituting each of these layers.

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