FR2967756A1 - Device for heating cosmetic composition for human keratinous materials, comprises first closed compartment containing element primer and saturated solution at room temperature to generate exothermic reaction, and second compartment - Google Patents

Abstract

The heating device comprises a first closed compartment containing an element primer and a saturated solution at a room temperature to generate an exothermic reaction when the solution undergoes a perturbation provoked by the element primer, and a second compartment having an opening to insert a cosmetic composition alone or packaged in a package in the second compartment. The first compartment is configured for recovering 80% of an outer surface defining the second compartment. Walls defining the second compartment are located in the first compartment. The heating device comprises a first closed compartment containing an element primer and a saturated solution at a room temperature to generate an exothermic reaction when the solution undergoes a perturbation provoked by the element primer, and a second compartment having an opening to insert a cosmetic composition alone or packaged in a package in the second compartment. The first compartment is configured for recovering 80% of an outer surface defining the second compartment. Walls defining the second compartment are located in the first compartment; and defining the first and second compartments are single sheet of flexible plastic material comprising a polyamide layer and a polypropylene layer. The element primer is a concave disc made of plastic material, and is encircled in a rigid plastic ring. The rigid plastic ring has a height that is greater than a height of the concavity of the disc of the primer. An independent claim is included for an assembly comprising a heating device.

Description

The present invention relates to a self-heating device of a cosmetic composition for application to human keratin materials. The invention more particularly relates to a self-heating device of a product initially at ambient temperature and to be applied at a temperature above ambient temperature. "Cosmetic product" means any composition as defined in Council Directive 93/35 / EEC of 14 June 1993. It is known that the temperature at which a cosmetic composition is applied affects the effectiveness of the treatment carried out. Indeed, an application of a previously heated cosmetic composition causes at the time of application superficial vasodilatation of the skin and is usually accompanied by localized hyperemia. These conditions promote the penetration and absorption of the assets of the cosmetic composition in the skin. The problem with hot application of a composition is the need to find a heat source available to raise the temperature of said composition. In the context of home use, the direct heating of the cosmetic composition in the microwave oven or in hot water may be poorly controlled, in particular the heating temperature of the cosmetic composition may not be controlled. . In this case overheating of the composition may cause the degradation of the active compounds and therefore a loss of its effectiveness. In the context of mobile use, and especially outside his home, heat sources may be difficult to find for a user. At the very least, a controlled heat source which makes it possible to achieve a given temperature within a limited time of the cosmetic composition is difficult to identify. For this purpose, there is a need for autonomous packaging devices, able to contain said composition to be associated with their own heat production system other than a source of electrical heat. In the state of the art, document WO0043286 is known in particular a device for applying a cosmetic product at a controlled temperature. According to this document, the product is contained in a rigid compartment disposed in the center of a larger container and containing alone reagents capable of generating an exothermic reaction when they are mixed together. For this purpose, the reagents are isolated in cells of this larger container. The cells are juxtaposed and have at least one common border. This common border provides separation, but is configured to be easily broken when the time comes, and then allow mixing. The mixture is then contained in the common volume of cells now in communication. A similar device is also known from FR2876358. However, such devices are disposable because once the reagents are mixed and the exothermic reaction has occurred, the reagents are no longer reusable. Moreover, the portion of the cometic composition opposite the opening of the compartment is not heated directly by the walls of the cells containing the mixed reagents placed in contact with the compartment containing the composition. The composition is not uniformly heated and the temperature rise time to the temperature threshold for the application is longer. Also known from US5205278 are self-heating devices used as a heater. These devices are closed bags made of flexible thermoplastic material, generally polyvinyl chloride (PVC) difficult to recycle, containing a supersaturated solution, in particular an aqueous solution of sodium acetate, and a primer for the exothermic reaction of precipitation of the solution. In addition to the fact that these devices do not include a compartment for heating cosmetic product, they also pose a problem, in the context of nomadic use, because they are very sensitive to shocks. It is not possible to prevent unintentional actuation of the activation element of the exothermic reaction within the compartment. In addition these devices are rechargeable by a heat input, but the piece of metal primer they contain prevents this heat input in a microwave oven. Similarly, the materials of the walls of these pockets are not adapted to a sudden heat supply such as that carried out in a microwave oven where the raising of the temperature beyond a certain threshold results in an internal pressure. solution that can burst the pocket.

GB2398478 discloses finally a heating device in the form of a mainly rigid container having a cavity for receiving directly food especially for babies. The container has a closed interior volume filled with a supersaturated sodium acetate solution, and a mechanism for triggering an exothermic reaction of the solution. However, such a device is not suitable for use of a cosmetic product which has its own packaging packaging. In addition, the portion of the composition facing the opening of the cavity is not heated directly by the walls of the container containing the mixed reagents brought into contact with the compartment containing the composition. The composition is therefore not uniformly heated.

The present invention therefore aims to provide an improved device for heating a cosmetic product to overcome the aforementioned drawbacks.

For this purpose, the invention proposes a device for heating a cosmetic composition comprising a first closed compartment containing a primer element and a supersaturated solution at ambient temperature capable of generating an exothermic reaction when the solution undergoes a disturbance caused by the primer element.

According to the invention, the device comprises a second compartment having an opening for inserting a cosmetic composition alone or packaged into a package in said second compartment, and the first compartment is capable of covering at least 80% of the envelope surface defining the second compartment. The invention advantageously makes it possible to obtain the homogeneous heating, at a defined temperature, of a cosmetic composition in any place and without the need for complex electrical apparatus. According to other features of the invention, the walls defining the second compartment may be located in the first compartment to obtain a compact device.

The walls defining the first and the second compartment may be sheets made of flexible plastic material, for example sheets comprising a polyamide layer and a polypropylene layer.

The walls defining the first and second compartments may be formed from a single sheet of flexible plastic material. The supersaturated solution may be an aqueous solution of sodium acetate whose concentration is for example 50%.

The primer element may be a concave pellet made of plastic material. The primer element can be encircled in a rigid plastic ring. The height of the rigid plastic ring may be greater than the height of the concavity of the primer pad.

The invention also relates to an assembly comprising a device written above and at least one cosmetic product package adapted to be partially introduced into the second compartment of the device. The packaging may be able to be introduced entirely into the second compartment of the device.

The cosmetic product packaging may comprise a thermosensitive marking for determining the temperature threshold of the packaging from which the cosmetic product can be applied.

The invention will be better understood on reading the following description of nonlimiting examples of implementation thereof, with reference to the appended drawings, in which: FIG. 1 represents an example of a first embodiment of a heating device associated with a bag of cosmetic product according to the invention; FIGS. 2A and 2B show sectional views along line II-II respectively with the cosmetic product bag out and in the device of FIG. 1; - Figure 3 shows a sectional view along the axis III-III of the device of Figure 1; Figures 4 and 5 show variants of the device of Figure 1; FIGS. 6 and 7 represent primer elements for a heating device according to the invention; FIG. 8 represents a cross-sectional view of the primer element of FIG. 7; FIG. 9 represents a variant of a cosmetic product that can be used with a heating device according to the invention; FIG. 10 represents a kit containing a heating device according to the invention and cosmetic products that can be used with the heating device; - Figures 11 and 12 show a second embodiment of the heating device according to the invention; - Figures 13 to 16 show the steps of producing a device according to the first embodiment.

According to a first embodiment, with reference to FIGS. 1 to 3, a device 1 for heating a cosmetic composition P comprises a first pocket 10 partially defining a first compartment 11 closed. The first pocket 10 is formed by first and second outer walls (15, 16) of flexible plastic material. At least some of the edges 13 of the first and second outer walls (15, 16) are joined together. The edges 13 are joined together by any appropriate means, for example by gluing, by means of a thermal weld or by means of a high frequency welding. The edges 13 can also be joined to each other only by continuity of the outer walls (15, 16) for example in the case of folding. The first pocket 10 may have a square, rectangular, polygonal, circular or any other shape.

The device 1 also comprises a second pocket 20 defining a second compartment 21 open towards the outside of the device. The second pocket is formed by a first and a second inner wall (25, 26) of flexible plastic material of which a portion of the edges 23 are joined together. As for the outer walls (15, 16) of the first pocket 10, some of the edges 23 of the inner walls (25, 26) of the second pocket 20 may be joined together by any means. In this example the second pocket 20 is of rectangular shape and three successive edges 23 are joined together, the last edges 24 being not joined to define an opening 28 in the second pocket 20. The second pocket 20 is not limited to a rectangular shape and can take other forms such as square, polygonal, circular or other, but is adapted to receive a cosmetic product P for example a sachet 3 of care cream.

The dimensions of the second pocket 20 are smaller than those of the first pocket 10 so that the second pocket 20 can be positioned in the first pocket 10, the unsealed edges 24 of the inner walls (25, 26) of the second pocket pocket 20 being connected to a portion 14 of an edge of the first pocket 10. Thus the edges 13 of the first pocket 10 are joined together on the periphery of the first pocket 10 except at the opening 28 of the second pocket 20 where the edges 14 of the first pocket facing the unsealed edges 24 of the second pocket 20 are joined to the unsealed edges 24 of the second pocket 20. The first closed compartment 11 is therefore defined by the outer walls (15, 16) of the first pocket 10 and the inner walls (25, 26) of the second pocket 20.

In this example, the walls described are formed by sheets of flexible plastic material, but the invention to be also made with some or all of the rigid walls. Advantageously, each wall is composed of a flexible sheet of peelable plastics that is to say which has several layers assembled together either by an adhesive or at the time of manufacture by rolling and assembly of the layers hot. The percentage of elongation before breaking of such a sheet is advantageously greater than 50% or even greater than 60%. For example, the walls of the device comprises a layer of a polyamide film (PA) 151um thick and a layer of a polypropylene film (PP) 701um. The two layers are glued to one another by means of a suitable adhesive layer. This type of sheet allows an elongation before rupture greater than 60% or even greater than 70%. In addition, the polyamide (PA) layer provides the wall with sufficient puncture resistance and impermeability to water and gas for this type of device, while the polypropylene (PP) layer also offers impermeability to water. water and sufficient gas for this type of device and the possibility of welding between two walls unlike the polyamide layer (PA).

Finally this type of wall has the advantage of being low polluting unlike polyvinyl chloride (PVC). In addition, this type of wall makes it possible to withstand a rise in temperature, for example during a passage in a microwave oven for 1 minutes or even 2 minutes at 1000 Watts, to be rigid enough not to be pierced. and sufficiently flexible not to break during a pressure rise in the first closed compartment 11. Finally the first compartment is capable of covering at least 80% of the envelope surface defining the second compartment. Thus, as shown in FIGS. 2A and 2B, when the bag 3 of cosmetic product is placed in the second compartment and the opening 28 is closed by approximation of the unsealed edges 24, the bag is almost entirely surrounded by the first compartment 11. The first closed compartment contains a primer element 30 and a supersaturated solution S at room temperature i.e. at about 20 ° C. A solution is said to be supersaturated when the solution contains more solute than it can dissolve. This type of solution is metastable, and the supersaturation solute precipitates at the slightest disturbance. This precipitation reaction is exothermic.

A supersaturated solution can be produced by raising the temperature of the mixture because the solubility of many solutes increases with the temperature thus allowing to dissolve more solute than at ambient temperature. By then lowering the temperature of the solution to room temperature, and thus lowering its solubility, an unstable supersaturated solution is obtained. Disturbance of the solution will cause precipitation of the solute. For example, a supersaturated solution can be obtained by dissolving sodium acetate in water. The solubility as a percentage by weight of sodium acetate trihydrate in aqueous solution is 31.8% at 20 ° C. and 58.3% at 60 ° C. The solution used in this example is an aqueous solution of 50% sodium acetate which is supersaturated at 20 ° C. This solution makes it possible to obtain a temperature of approximately 55 ° C. during the precipitation. The threshold of the temperature obtained by the thermal reaction is determined by the concentration of the solution, thus other temperature thresholds can be obtained by using solutions having a different concentration. When the precipitation is complete, the user can dissolve the precipitate again by introducing heat, in particular by immersing the device in water hot enough to dissolve the entire precipitate, or by placing the device in a micro-oven. -ondes. In the device 1, the disturbance of the supersaturated solution S is caused by the primer element 30. This primer element 30 may be a flexible metal pellet 31 shown in FIG. 6. In a first position, the pellet is concave. . At the pressure of the user on the pellet 31, said pellet changes convexity and abruptly passes into a second convex dotted position in FIG. 8. This passage from the first to the second position causes a disturbance in the supersaturated solution. S in the form of a shock wave causing the precipitation of the unstable solution. However the use of a metal pellet is not compatible with a heat input in a microwave oven to dissolve the precipitate again after use of the device. An alternative primer compatible with heat input in a microwave oven is a flexible circular plastic pellet. In this example the pellet made of polyethylene terephthalate (PET) which offers a suitable flexibility but other types of plastics can be used. As for the metal pellet 31, in a first position the pellet is concave. During a pressure of the user on the pellet, said pellet passes into a second convex position causing a disturbance in the supersaturated solution in the form of a shock wave during the transition from the first position to the second position.

In order to obtain an abrupt passage from the first to the second position of a plastic pellet, the primer element may comprise a plastic pellet constrained in a ring 37 as shown in FIGS. 7 and 8. For this purpose, the circular plastic pellet 33 has a flat edge 34 around a concave central portion 35. The inner face of the ring has a circular groove 38 in which the end of the flat edge 34 of the pellet 33 is positioned in contact with the bottom 39 of the groove 38. To obtain a constraining effect of the ring 37 on the plastic wafer 33, the diameter of the bottom 39 of the groove 38 is smaller than the diameter of the end of the flat edge 34 of the wafer at rest . The ring 37 is made of polypropylene (PP) in order to obtain sufficient rigidity to maintain the pellet 33 without deforming during the supply of heat. Other plastic materials can however be used as polyethylene (PE).

The ring 37 may in particular have a height sufficient for the pellet 33 in its first or second position does not exceed beyond the upper or lower edge 40 of the ring. For example, the height of the ring 37 may be greater than twice the height of the pellet 33. Thus, this primer 30 limits involuntary actuations by limiting access to this pellet 33.

Variants of the device according to the invention are shown in Figures 4 and 5. In Figure 4, the device 1 has a first pocket and a second pocket as in the previous example. However, the second pocket forms a second compartment opening on two opposite edges of the first pocket. This configuration makes it possible in particular to facilitate the introduction and extraction of the cosmetic product bag in the second compartment. In Figure 5, the device 1 has a first pocket and several second independent pockets, two second pockets are shown in this example. This configuration makes it possible in particular to be able to heat several sachets of cosmetic product at the same time, for example to make an extemporaneous mixture thereafter. The cosmetic product can be contained in a sachet. This cosmetic product can be a care product such as a cream or a mask. This product may also be a make-up product such as lipstick, a foundation or as shown in FIG. 9, a mascara for example for single use of which the applicator 5 is pre-loaded with product. The bag 3 may include a thermosensitive indicator 4 shown in FIG. 1. This indicator 4 is for example a thermosensitive ink printed on the bag 3, and is capable of changing color when the temperature threshold from which the product P is usable is reached.

As illustrated in FIG. 10, the invention may be presented in the form of a package or kit comprising a heating device 1 and several sachets 3 of cosmetic products P, each bag 3 containing the same product or different products. According to a second embodiment of the invention shown in Figures 11 and 12, the heating device 101 of a cosmetic composition P comprises a first pocket 110 defining a first compartment 111 closed. The first pocket 110 is formed by first and second outer walls (115, 116) of flexible plastic material. All edges 113 of the first and second walls are joined together. The edges 113 are joined together by the same means as in the first embodiment. The first pocket 110 is preferably square or rectangular, but other shapes may also be suitable. The first bag 110 contains a primer element 30 and a supersaturated solution S at room temperature. The supersaturated solution S and the primer element 30 are similar to those described in the first embodiment above. The device 101 also comprises a second pocket 120 defining a second compartment 121 open towards the outside of the device. The second pocket 120 is formed by a first and a second inner wall (125, 126) of flexible plastic material, a portion of the edges 123 are joined together. In this example the second pocket 120 is of rectangular shape and three successive edges 123 are joined together, the last edges 124 being not joined to define an opening 128 in the second pocket 120 in order to be able to introduce into the second compartment 121 a product. Cosmetic P, for example, packaged in a bag 3. The second bag 120 is not limited to a rectangular shape and can take other shapes such as square, polygonal, circular or other, but is adapted to receive a cosmetic product P for example a sachet 3 of care cream. In this example an attached edge 113 of the first pocket 110 is common with an attached edge 123 of the second pocket 120. This common edge extends along a first axis P1. In FIG. 12, the second pocket 120 is folded over the first pocket 110 according to the first folding axis P1. The dimension of the second pocket 120 is adapted so that when the second pocket 120 is folded along the first axis P1 on the first pocket 110, the second pocket 120 covers less than the second pocket 110. half of the first pocket 110. Thus the first pocket 110 can then be folded in two along a second axis of folding P2 so that the second pocket 120 is positioned between the two folded portions of the first pocket 110. In this way, the first compartment 111 defined by the first pocket 110 is capable of covering at least 80% of the envelope surface defining the second compartment 121 formed by the second pocket 120. The invention also relates to a manufacturing method a heating device. A manufacturing method will now be described with reference to Figures 13 to 16. A first step is the folding of a sheet of substantially rectangular flexible plastic material. As in Figure 13, the sheet is folded in its width at the axis of symmetry Al of the rectangular sheet. Each portion of the sheet on either side of the fold of the Al axis respectively forms the first inner and outer 25 walls 15 on the one hand and the inner and outer 26 second outer walls 16 on the other hand of the fold. The first 25 and second 26 inner walls are formed by the parts closest to the fold. For example, they form the first third of each portion of the sheet on either side of the fold to second fold axes A2 and A2 '. The first 15 and second 16 outer walls are then formed by the two-thirds distal of each portion on either side of the fold. A second step consists of welding between them the four free edges 23 of the first 25 and second 26 inner walls to the second fold axes A2 and A2 '. The welding is for example carried out by means of a thermal welding or by means of a high-frequency welding. In FIG. 14, a third step consists in folding each portion on either side of the first fold along axis A1 by folding said portion relative to second folding axes A2 and A2 'so that the first 25 and second 26 inner walls are between the first 15 and second 16 outer walls thus folded.

A fourth step consists of welding between them the free edges 13 of the first 15 and the second 16 outer walls except for the free edges forming the ends of the flexible sheet. During this fourth step, it is also possible to form a holding weld 18 connecting two zones of the first 15 and the second 16 outer walls. In Fig. 15, a fifth step is the supersaturated solution filling S of the first pocket 10 formed by the first outer 15 and second 16. The filling is effected by the side of the first bag 10 not welded in the previous step. A primer element 30 is also placed in the first pocket, for example at the holding weld 18. A last step consists of welding the last unsealed edge of the first pocket 10 so as to close it in a sealed manner and to obtain the device according to the invention shown in FIG.

This method, using a plastic sheet avoids certain positioning steps when assembling multiple sheets, as well as a number of cuts to shape the sheets to assemble. This method is described by way of example, any other method may be used to form devices according to the invention, in particular by using two, three, four or more flexible sheets. The invention is not limited to the illustrated examples. The characteristics of the various examples may especially be combined within non-illustrated variants. The expression "comprising a" shall be understood as meaning "containing at least one" unless the contrary is specified.

Claims (13)

REVENDICATIONS1. Device for heating a cosmetic composition comprising a first closed compartment containing a primer element and a supersaturated solution at ambient temperature capable of generating an exothermic reaction when the solution undergoes a disturbance caused by the primer element, characterized in that the device comprises a second compartment having an opening for inserting a cosmetic composition alone or packaged into a package in said second compartment, and in that the first compartment is capable of covering at least 80% of the envelope surface defining the second compartment. compartment. 2. Heating device according to claim 1, characterized in that the walls defining the second compartment are located in the first compartment. 3. Heating device according to one of the preceding claims, characterized in that the walls defining the first and the second compartment are sheets made of flexible plastic material. Heating device according to one of the preceding claims, characterized in that the walls defining the first and second compartments are sheets having a polyamide layer and a polypropylene layer. Heating device according to one of the preceding claims, characterized in that the walls defining the first and second compartments are formed from a single sheet of flexible plastic material. 6. Heating device according to one of the preceding claims, characterized in that the supersaturated solution is an aqueous solution of sodium acetate. 30 7. Heating device according to the preceding claim, characterized in that the concentration of the aqueous sodium acetate solution is 50%. 13 8. Heating device according to one of the preceding claims, characterized in that the primer element is a concave pellet made of plastic material. 9. Heating device according to the preceding claim, characterized in that the primer element is encircled in a rigid plastic ring. 10. Heating device according to the preceding claim, characterized in that the rigid plastic ring has a height greater than the height of the concavity of the primer pad. 11. An assembly comprising a device according to one of claims 1 to 10, and at least one cosmetic product package adapted to be partly introduced into the second compartment of the device. 15 12. An assembly according to claim 11, characterized in that the packaging is able to be introduced entirely in the second compartment of the device. 13. An assembly according to one of claims 11 or 12, characterized in that the cosmetic product package comprises a thermosensitive marking 20 for determining the temperature threshold of the package from which the cosmetic product can be applied. 10