A subject-matter of the present invention is a packaging device produced at least in part by means of a sheet forming a multilayer complex which makes possible the packaging of products which are sensitive to light, to gases and/or to moisture.
It is known to protect such sensitive products by wrappings. Wrappings which are particularly appropriate are provided in the form of sheets capable of surrounding these products, whatever their dimensions, these sheets being, for example, arranged so as to form a flexible bag or sachet around the product.
In order to render wrappings of this type impermeable to light, to gases and to vapour, the material from which the wrapping is made must exhibit at least one barrier-forming layer. A barrier-forming layer which is particularly appropriate can be composed, for example, of a metal sheet. As a metal sheet is not able to satisfy all the conditions required for a wrapping material, in practice other layers, and in particular layers of plastics, are applied to one face or both faces of the metal sheet. These layers can, for example, be layers put on by extrusion or applied by means of a bonding agent in the form of sheets of thermoplastics. These laminated materials, comprising several layers, make it possible to provide wrapping materials suitable for shaping.
In particular, the document EP 0 863 812 discloses a laminated material which comprises a layer of plastic attached by means of a bonding agent to a layer of oriented polyamide (oPA) itself attached by means of a bonding agent to a first side of a sheet of aluminium, the second side of this sheet of aluminium, opposite the first side, being covered with a layer of PVC via a bonding agent. It is known to use specific polymers, such as polyurethanes, as bonding agent.
The document US 4 284 672 discloses a laminated material which comprises an outer layer made of biaxially oriented thermoplastic polymer, an intermediate metal layer and a layer which promotes the adhesion between the metal layer and an inner layer which itself is composed of a polymer which can be heat sealed to itself. The layer promoting the adhesion is in particular a layer of a copolymer of acrylic acid and of ethylene. The material disclosed in this document makes it possible in particular to obtain very flat wrappings which are thus easy to transport and which withstand mechanical stress.
A problem arises in the state of the art when laminated materials are used for wrapping and packaging products such as compositions comprising a basifying agent, in particular those comprising aqueous ammonia. This problem is particularly serious in the field of the dyeing of keratinous fibres.
This is because, when such air-sensitive and in particular oxygen-sensitive compositions are packaged in sachets produced by means of such laminated materials, delamination inside the sachet is observed after a storage time of a few weeks. This delamination is observed in particular between the layers connected to one another via a bonding agent and more particularly between the layers of materials positioned on the side of the metal layer facing the said product.
This delamination is reflected by physical separation of the layers of the laminated material, yet initially firmly attached to one another. Another consequence thereof is the failure of the leaktightness of the sachet thus formed. This is because this delamination can also be accompanied by fragmentation of the metal layer and there is a risk of the product present then flowing out of its packaging and there is a risk of the gases, solvents or aromatic materials present therein spreading out of the sachet. And in all cases phenomena of gas permeation occur, the product then being degraded and rendered unsuitable for use. Under such conditions, the preservation of the product over a long period is not guaranteed.
There exists a need for novel laminated materials which can be brought into contact with alkaline solutions, namely having a pH of greater than 7 and preferably greater than 9, and/or oxidizing
solutions and in particular into contact with compositions for the dyeing of keratinous fibres while guaranteeing the leaktightness of the wrappings formed from such laminated materials.
The object of the present invention is thus to provide a packaging device comprising:
i) at least one flexible sheet delimiting at least in part a housing, the said flexible sheet forming a multilayer complex comprising:
a) a metal layer;
b) a bonding agent comprising a copolymer comprising at least 7% by weight of carboxylic and/or carboxylate units, it being possible for the carboxylic units to be in the acid form or in the form of salts, and
c) a layer of a non-metallic material bonded to the metal layer via the said bonding agent,
ii) a cosmetic composition positioned inside the housing.
The term "cosmetic composition" is understood to mean a cosmetic composition or at least a compound intended for the preparation of a cosmetic composition.
The invention thus relates to a device for packaging a product comprising at least a first wall delimiting at least in part a housing comprising the said product, this first wall being produced from a laminated material comprising at least one structure as
layers presented in the following order:
a) a metal layer,
b) a layer of a bonding agent comprising a copolymer comprising at least 7% by weight of carboxylic and/or carboxylate units, it being possible for the carboxylic units to be in the acid form or in the form of salts, and
c) a first outer structure,
the said first wall being arranged in such a way that the first outer structure forms an inner face directed towards the inside of the housing suitable for being brought into contact with the said product.
Such a laminated material makes it possible in particular to obtain wrappings which are more resistant to delamination phenomena between the metal layer and the outer structure, optionally of plastic, in contact with the product present in the wrapping, even if the latter is brought into contact with an alkaline and/or oxidizing composition.
The term "copolymer" denotes a polymer obtained by polymerization of at least two monomers. In fact, it encompasses copolymers (often regarded as including two polymerized monomers), terpolymers (three polymerized monomers) and tetrapolymers (four polymerized monomers).
Advantageously, the carboxylate unit is an acrylate or methacrylate unit. Preferably, this
acrylate unit is ethyl acrylate.
Advantageously, the carboxylic unit is acrylic or methacrylic acid.
Preferably, the copolymer comprises at least one second monomer exhibiting an alkylene unit, the alkyl chain of which comprises from 2 to 10 carbon atoms.
In particular, the bonding agent can be a copolymer of ethylene and of ethyl acrylate. Alternatively, the bonding agent can also be a copolymer of ethylene and of acrylic acid.
Preferably, the bonding agent comprises between 7% and 19%, more particularly between 8% and 11%, more specifically between 8.5% and 10.5%, and preferably 9.7%, by weight of an acrylic acid and/or of an acrylic ester.
The layer of non-metallic material forms a first outer structure; it can in particular be made of a thermoplastic, preferably a polymer, for example from polyethylene. The metal layer can be made of aluminium or of an alloy comprising aluminium.
According to one embodiment of the invention, the flexible sheet exhibits a thickness of between 70 and 232 urn, such that
- the metal layer has a thickness of between 6 and 25 urn, preferably being of the order of 12 urn,
- the layer of bonding agent has a thickness
of between 10 and 40 µm, preferably being of the order of 25 µm,
- the layer of non-metallic material has a thickness of between 40 and 150 µm, preferably being of the order of 75 µm.
In particular, the multilayer complex, referred to as laminated material, can comprise a second outer structure chosen in particular in order to mechanically protect at least the metal layer, this second outer structure being attached to the metal layer so as to form an outer face directed towards the outside of the said housing. It can be made of a thermoplastic, preferably a polymer, for example from poly(ethylene terephthalate).
According to a preferred embodiment, the second outer structure is firmly attached to the metal layer via a layer of a second bonding agent, in particular a polyurethane-based adhesive. Preferably, this layer of second bonding agent has a thickness of between 2 and 5 µm, for example being of the order of 4 µm, the second outer structure having a thickness of between 10 and 25 µm and preferably being of the order of 12 µm.
According to a preferred embodiment, the multilayer complex of the flexible sheet is obtained by laminating. For example, the bonding agent can be extruded.
This flexible sheet is at least in part deformable elastically; it is produced so as to exhibit a degree of flexibility in order to be able in particular to be folded over itself without splitting the layered structure of the material constituting it.
According to a first embodiment, the device comprises a bottom part exhibiting a housing capable of receiving the said product, this bottom part being closed off by the said flexible sheet, for example sealed over one side of this bottom part, in order to delimit the said housing.
In an alternative form, according to a second embodiment, the device according to the invention is provided in the form of a sachet comprising at least one second wall sealed to the flexible sheet forming a first wall in order to delimit the said housing inside which the product is enclosed, this second wall preferably being produced from the same material as the flexible sheet.
Preferably, the packaging device is equipped with a dispensing means which makes possible the dispensing of the product enclosed in the device. For example, this dispensing means can be an airless pump.
According to an advantageous embodiment, the product present in the housing is an alkaline composition. Advantageously, the product present in the housing is a composition comprising a basifying agent.
In particular, this basifying agent is chosen from aqueous ammonia and/or ethanolamine and/or sodium silicate. Furthermore, the said composition can additionally comprise at least one oxidation base and optionally at least one coupler. The composition can also comprise one or more direct dyes.
Another subject-matter of the invention is the use of a packaging device according to the invention for the leaktight packaging of an alkaline composition. Another subject-matter of the invention is the use of such a device according to the invention for the leaktight packaging of a composition comprising a basifying agent, in particular such as a composition comprising aqueous ammonia and/or ethanolamine, it being possible for this composition in addition to comprise at least one oxidation base and optionally at least one coupler and/or to comprise one or more direct dyes.
The invention will be better understood on reading the description which follows and on examining the figures which accompany it. The latter are presented only by way of indication and are in no way limiting of the invention. The figures show:
- Figure 1: a view in cross section of a laminated material according to the invention;
- Figure 2: a perspective view of a first packaging device according to the invention;
- Figure 3: a perspective view of a second packaging device according to the invention;
- Figure 4: a sectional view of a third packaging device according to the invention.
Figure 1 shows a material 1 existing in the form of a sheet cut across its thickness; this material 1 forms a multilayer complex exhibiting a laminated structure comprising at least the following layers superimposed on one another in the following order:
- a metal layer 4,
- a bonding agent 5 comprising a copolymer comprising at least 7% by weight of carboxylic and/or carboxylate units, it being possible for the carboxylic units to be in the acid form or in the form of salts, and
- a layer of a non-metallic material forming a first outer structure 6.
Preferably, as this material 1 is chosen in order to package a product, the layer of non-metallic material 6 forms a first outer structure 6 suitable for being brought into contact with the product, and the metal layer 4 is furthermore covered with a second outer structure 2 on a side opposite that on which the first outer structure 6 is held.
This second outer structure 2 can be produced from one or more layers, attached to one another, of
paper, of board and/or of thermoplastics, such as vinyl plastics, for example based on poly(vinyl chloride) (PVC), polyesters, polyolefin plastics or polyamides.
Examples of plastics based on poly(vinyl chloride) (PVC) are vinyl plastics comprising vinyl chloride units in their structure, such as copolymers of vinyl chloride with vinyl esters of aliphatic acids, copolymers of vinyl chloride with esters of acrylic or methacrylic acid or with acrylonitrile, copolymers of vinyl chloride with diene bonds and unsaturated dicarboxylic acids or their anhydrides, copolymers of vinyl chloride and of vinylidene chloride with unsaturated aldehydes, with ketones, and the like, or polymers and copolymers of vinylidene chloride with vinyl chloride or other polymerizable compounds. Vinyl-based thermoplastics can also be rendered flexible in a way known per se using primary or secondary plasticizers. The PVC sheets can, as the case may be, also be drawn monoaxially (oPVC) or biaxially.
Examples of plastics based on polyesters are poly(alkylene terephthalate)s or poly(alkylene isophthalate)s having alkyl groups or radicals comprising from 2 to 10 carbon atoms or alkyl groups comprising from 2 to 10 carbon atoms which are interrupted at least by one -0-, such as, for example, poly(ethylene terephthalate) (PET sheets), poly(propylene terephthalate), poly(butylene
terephthalate) (poly(tetramethylene terephthalate)), poly(decamethylene terephthalate), poly(1,4-cyclohexyl-dimethylol terephthalate) or poly(ethylene 2,6-naphthalenedicarboxylate), or copolymers of poly(alkylene terephthalate) and poly(alkylene isophthalate), the proportion of isophthalate being, for example, from 1 to 10 mol%, copolymers and terpolymers, and also block polymers and grafted alternative forms of the abovementioned substances. Other appropriate polyesters, such as poly(ethylene naphthalate), are known in the technical field under the abbreviation PEN.
Other polyesters are copolymers of terephthalic acid and of another polycarboxylic acid with at least one glycol. Copolyesters of terephthalic acid, of ethylene glycol and of an additional glycol are appropriate. Glycol-modified polyesters, which are known in the technical field under the name PETG, are preferred.
Appropriate polyesters are composed of poly(alkylene terephthalate)s having alkyl groups or radicals comprising 2 to 10 carbon atoms and poly(alkylene terephthalate)s having alkyl groups or radicals comprising 2 to 10 carbon atoms which are interrupted by 1 or 2 -0-.
Other preferred polyesters are poly(alkylene terephthalate)s having alkyl groups or radicals
comprising 2 to 4 carbon atoms and preference is very particularly given to poly(ethylene terephthalate)s. These poly(ethylene terephthalate)s also include A-PET, PETP and the PETG mentioned or the G-PET.
Examples of polyolefin materials are polyethylenes (PE), for example high density polyethylene (HDPE, density of greater than 0.944 g/cm3), medium density polyethylene (MDPE, density of 0.926 to 0.940 g/cm3), linear medium density polyethylene (LMDPE, density of 0.926 to 0.940 g/cm3), low density polyethylene (LDPE, density of 0.910 to 0.925 g/cm3) and linear low density polyethylene (LLDPE, density of 0.916 to 0.925 g/cm3), for example in the form of nonoriented sheets (PE sheet) or monoaxially or biaxially oriented sheets (oPE sheet), polypropylenes (PP), such as axially or biaxially oriented polypropylene (oPP sheet) or cast polypropylene (cPP sheet), amorphous or crystalline polypropylene or their blends or atactic or isotactic polypropylene or their blends, poly(1-butene), poly(3-methylbutene), poly(4-methylpentene) and their copolymers, then polyethylene with vinyl acetate, vinyl alcohol or acrylic acid, such as, for example, ionomer resins, such as copolymers of ethylene, of acrylic acid, of methacrylic acid, of acrylic esters, tetrafluoro-ethylene or polypropylene, in addition random copolymers, block copolymers or olefin polymer/
elastomer blends. The polyolefin materials can also comprise cycloolefins as monomer of a homopolymer or of copolymers.
Preference is given to high density polyethylenes and to polypropylenes, and also to ionomers, for example known under the trade name Surfyn.
Examples of polyamides (PA) for the plastic sheets are composed, for example, of polyamide 6, s-caprolactam homopolymer (polycaprolactam); polyamide 11; polyamide 12, co-lauryllactam homopolymer (polylauryllactam); polyamide 6,6, homopolycondensate of hexamethylenediamine and of adipic acid (poly(hexamethylene adipamide)); polyamide 6,10, homopolycondensate of hexamethylenediamine and of sebacic acid (poly(hexamethylene sebacamide); polyamide 6,12, homopolycondensate of hexamethylenediamine and of dodecanedioic acid (poly(hexamethylene dodecanamide)) or polyamide 6-3-T, homopolycondensate of trimethyl-hexamethylenediamine and of terephthalic acid (poly(trimethylhexamethylene terephthalamide)), and their blends. The polyamide sheets are drawn monoaxially or biaxially (oPA).
The second outer structure 2 is preferably composed of poly(alkylene terephthalate), for example of poly(ethylene terephthalate), so as to improve the impact strength of the material 1 finally produced, in
particular to improve the resistance to the impact which might be experienced from the outer perimeter of the packaging device at least in part delimited by a flexible sheet forming a first wall produced from this material 1.
The second outer structure 2 generally exhibits a thickness 8 of between 12 um and 25 urn.
If appropriate, this second outer structure 2 is attached to the metal layer 4 by means of a layer 3 of a second bonding agent produced from appropriate laminating adhesives which may comprise solvents or which may be devoid of solvents and which may also comprise water. Examples of laminating adhesives are composed of acrylate adhesives which comprise solvents, which are devoid of solvents or which are aqueous or of polyurethane-adhesive systems. However, it is also possible to use adhesives which cure under the effect of electromagnetic radiation (for example under UV radiation or electron beams). It is also possible to produce this layer 3 from aliphatic polyesters or diisocyanates, or from appropriate lacquers, such as, for example, acrylate-based lacquers, epoxy resins, melamine resins, urea resins, polyurethanes, cellulose nitrate, polyesters and their mixtures. The lacquers, for example, can be solvent-based or aqueous-based or can be systems comprising one, two or more components. The lacquers can, for example, be cured by drying,
thermally, chemically and/or using radiation (UV; electron beam; IR).
Preferably, the layer 3 is made of polyurethane. It has, for example, a thickness 9 of between 2 and 5 urn, preferably of the order of 4 urn.
In an alternative form (not represented), the second outer structure 2 is a varnish capable of being directly attached to the metal layer 4.
The metal layer 4 according to the invention can be made of iron, steel, nickel, copper, tin, bronze, brass, aluminiµm, and the like. Advantageously, the metal sheet 4 is made of aluminium having a degree of purity of 99.95% to 97% (% by weight), the remainder being inevitable impurities or alloying elements. Examples of alloys are those having aluminium as the main component and Fe, Si, Mg, Mn, Ti and/or Cu as alloying elements, such as, for example, the alloys AlFel.5Mn, AlFeSi or AlFeSiMn, respectively having a purity of greater than 97.5% and preferably of greater than 98.5% (% by weight) of aluminium.
In particular, the metal layer 4 is made of aluminium and exhibits a thickness 10 of between 6 and 12 urn, preferably of the order of 12 um.
The faces 11 and 12 of the metal layer 4 can exhibit an improved adhesion for the bonding agent by virtue of a pretreatment aimed in particular at increasing the surface tension of these faces 11 and
12, for example brushing, chromating, ionization treatment, ozone treatment, corona treatment, flame treatment or plasma treatment.
The layer 5 of bonding agent comprises a copolymer comprising at least 7% by weight of carboxylic and/or carboxylate units, it being possible for the carboxylic units to be in the acid form or in the form of salts. In particular, the carboxylic and/or carboxylate units are present in an amount of between 7% and 19%, and preferably of the order of 9.7%, by weight.
In particular, the layer 5 is a copolymer which comprises at least one first monomer according to the following unit
(-CH2-CR3COOR2-)m R3 = H or CH3,
R2 = H or linear or branched unsubstituted alkyl group, such as a methyl, ethyl, propyl or isobutyl group, or R2 represents a C4 to C1 cycloalkyl group, and m being chosen in such a way that this first monomer represents between 7 and 19% by weight of the copolymer.
In particular, this copolymer comprises at least one second monomer formed of an alkylene unit comprising from 1 to 10 carbon atoms and in particular exhibiting an ethylene unit according to the following formula:
(-CH2-CH2-)n n being chosen in such a way that this second monomer represents between 71 and 92% by weight of the copolymer.
Preferably, the copolymer forming the layer 5 is a copolymer of ethylene and of ethyl acrylate comprising 9.7% by weight of ethyl acrylate and/or a copolymer of ethylene and of acrylic acid comprising 9.7% by weight of acrylic acid. The layer 5 generally has a thickness 13 of between 10 and 40 µm, preferably of the order of 25 µm.
Finally, this layer 5 of bonding agent is used to attach the metal layer 4 to the first outer structure 6, the latter preferably being made of a non-metallic material and preferably of a thermoplastic of the same type as those given above as implementational example for the second outer structure 2. The first outer structure 6 can itself be produced from one or more layers attached to one another and made of materials which are optionally distinct from one another.
More particularly, the first outer structure 6 forms a polyethylene layer. Furthermore, it has a thickness 14 of between 40 and 150 µm and preferably of the order of 75 µm.
The layers and/or respectively structures 2, 3, 5 and 6 can be transparent, translucent or opaque
and can be clear or partially or completely coloured.
At least one of the outer faces 15 and/or 16 of the material 1, respectively represented by the outer structures 2 and 6, and preferably the first, can be covered by a printed design, itself optionally covered by a lacquer. These outer faces 15 and/or 16 can also be provided with a lacquer, it also being possible, as the case may be, for this lacquer to be printed and/or to be capable of being printed on the wrapping plants, for example using UV radiation, solvents, laser beams or electron beams.
In the case where the outer layers or structures are made of plastics, they can be extruded. In particular, the material 1 is obtained by laminating the layers over one another.
According to a specific embodiment of the material 1, this material 1 can also comprise an arrangement of layers and/or structures which are symmetrical with respect to one another on either side of the metal layer 4.
Preferably, this material 1 can be produced in the form of an endless material, such as rolls, and can be subsequently cut into sections to be assembled so as to form packaging devices.
In particular, the material 1 is used to contribute to the packaging of cosmetic products, such as compositions for the dyeing of keratinous fibres, in
particular compositions for oxidation dyeing comprising a basifying agent.
Mention may be made, as examples of basifying agents, of aqueous ammonia, alkaline carbonates, alkanolamines, such as mono-, di- and triethanolamines and their derivatives, sodium hydroxide, potassium hydroxide and the compounds of following formula (II):
(Formula Removed)
in which W is a propylene residue optionally substituted by a hydroxyl group or a C1-C4 alkyl radical and Ra, Rb, Rc and Rd, which are identical or different, represent a hydrogen atom, a C1-C4 alkyl radical or a C1-C4 hydroxyalkyl radical.
According to a preferred embodiment, the basifying agent is chosen from aqueous ammonia and/or ethanolamine.
Conventionally, compositions for the oxidation dyeing of keratinous fibres, in particular human hair, comprise, in an appropriate mediµm, at least one oxidation base and optionally one or more couplers.
Mention may be made, as oxidation bases, of para-phenylenediamines, bisphenylalkylenediamines, para-aminophenols, bis-para-aminophenols, ortho-amino-phenols, heterocyclic bases and their addition salts.
Mention may be made, among para-phenylene-
diamines, by way of example, of para-phenylenediamine, para-toluenediamine, 2-chloro-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para-phenylenediamine, N,N-diethyl-para-phenylenediamine, N,N-dipropyl-para-phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis(ß-hydroxyethyl)-para-phenylenediamine, 4-N, N-bis (ß-hydroxyethyl) amino-2-methylaniline, 4-N, N-bis ((3-hydroxyethyl) amino-2-chloroaniline, 2-(ß-hydroxyethyl)-para-phenylenediamine, 2-fluoro-para-phenylenediamine, 2-isopropyl-para-phenylenediamine, N-(ß-hydroxypropyl)-para-phenylenediamine, 2-hydroxymethyl-para-
phenylenediamine, N,N-dimethyl-3-methyl-para-phenylene-diamine, N,N-(ethyl, p-hydroxyethyl)-para-phenylenediamine, N- (P,y-dihydroxypropyl)-para-phenylenediamine, N-(4'-aminophenyl)-para-phenylenediamine, N-phenyl-para-phenylenediamine, 2-(ß-hydroxyethyloxy)-para-phenylenediamine, 2-(ß-acetylaminoethyloxy)-para-phenylenediamine, N-(ß-methoxyethyl)-para-phenylenediamine, 4-aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2-(ß-hydroxyethylamino)-5-amino-toluene, 3-hydroxy-l-(4'-aminophenyl)pyrrolidine and their addition salts with an acid.
Among the para-phenylenediamines mentioned above, para-phenylenediamine, para-toluenediamine,
2-isopropyl-para-phenylenediamine, 2-(ß-hydroxyethyl)-para-phenylenediamine, 2- (ß-hydroxyethyloxy) -para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, N,N-bis(ß-hydroxyethyl)-para-phenylenediamine, 2-chloro-para-phenylenediamine, 2- ((3-acetylaminoethyloxy) -para-phenylenediamine and their addition salts with an acid are particularly preferred.
Mention may be made, among bisphenylalkylene-diamines, by way of example, of N,N'-bis(ß-hydroxy-ethyl)-N,N'-bis(4'-aminophenyl)-1,3-diaminopropanol, N,N'-bis(ß-hydroxyethyl)-N,N'-bis(4' -aminophenyl)-ethylenediamine, N,N'-bis(4-aminophenyl)tetramethylene-diamine, N,N'-bis(ß-hydroxyethyl)-N,N' -bis(4-aminophenyl) tetramethylenediamine, N,N'-bis(4-methylamino-phenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'-methylphenyl)ethylenediamine, 1,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctane and their addition salts with an acid.
Mention may be made, among para-aminophenols, by way of example, of para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-chlorophenol, 4-amino-2-chlorophenol, 4-amino-3-fluorophenol, 4-amino-3-(hydroxymethyl)phenol, 4-amino-2-methylphenol, 4-amino-2-(hydroxymethyl)phenol, 4-amino-2-(methoxy-methyl)phenol, 4-amino-2-(aminomethyl)phenol, 4-amino-
2-( ((3-hydroxyethyl) aminomethyl) phenol, 4-amino-2-fluorophenol and their addition salts with an acid.
Mention may be made, among ortho-amino-phenols, by way of example, of 2-aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol, 5-acetamido-2-aminophenol and their addition salts with an acid.
Mention may be made, among heterocyclic bases, by way of example, of pyridine derivatives, pyrimidine derivatives, pyrazole derivatives and indole or indoline derivatives.
Mention may be made, among pyridine derivatives, of the compounds disclosed, for example, in Patents GB 1 026 978 and GB 1 153 196, such as 2,5-diaminopyridine, 2-[(4-methoxyphenyl)amino]-3-aminopyridine, 2,3-diamino-6-methoxypyridine, 2-[(ß-methoxyethyl)amino]-3-amino-6-methoxypyridine, 3,4-diaminopyridine and their addition salts with an acid.
Other pyridine oxidation bases of use in the present invention are the 3-aminopyrazolo[1,5-a]-pyridine oxidation bases or their addition salts disclosed, for example, in Patent Application FR 2 801 308. Mention may be made, by way of example, of pyrazolo[1,5-a]pyridin-3-ylamine; 2-(acetylamino)-pyrazolo[1,5-a]pyridin-3-ylamine; 2-(morpholin-4-yl)-pyrazolo[1,5-a]pyridin-3-ylamine; 3-aminopyrazolo-[1,5-a]pyridine-2-carboxylic acid; 2-methoxypyrazolo-
[1,5-a]pyridin-3-ylamine; (3-aminopyrazolo[1,5-a]-pyridin-7-yl)methanol; 2-(3-aminopyrazolo[1,5-a]-pyridin-5-yl)ethanol; 2-(3-aminopyrazolo[1,5-a]pyridin-7-yl)ethanol; (3-aminopyrazolo[1,5-a]pyridin-2-yl)methanol; 3,6-diaminopyrazolo[1,5-a]pyridine; 3,4-diaminopyrazolo[1,5-a]pyridine; pyrazolo[1,5-a]-pyridine-3,7-diamine; 7-(morpholin-4-yl)pyrazolo-[1,5-a]pyridin-3-ylamine; pyrazolo[1,5-a]pyridine-3,5-diamine; 5-(morpholin-4-yl)pyrazolo[1,5-a]pyridin-3-ylamine; 2-[(3-aminopyrazolo[1,5-a]pyridin-5-yl)(2-hydroxyethyl)amino]ethanol; 2-[(3-aminopyrazolo [1,5-a]pyridin-7-yl)(2-hydroxyethyl)amino]-ethanol; 3-aminopyrazolo[1,5-a]pyridin-5-ol; 3-aminopyrazolo [1,5-a]pyridin-4-ol; 3-aminopyrazolo[1,5-a]-pyridin-6-ol; 3-aminopyrazolo[1,5-a]pyridin-7-ol; and their addition salts with an acid or with a base.
Mention may be made, among pyrimidine derivatives, of the compounds disclosed, for example, in Patents DE 2 359 399; JP 88-169571; JP 05-63124; EP 0 770 375 or Patent Application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triamino-pyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6-diaminopyrimidine or 2,5,6-triaminopyrimidine, and pyrazolopyrimidine derivatives, such as those mentioned in Patent Application FR-A-2 750 048 and among which may be mentioned pyrazolo[1,5-a]-pyrimidine-3,7-diamine; 2,5-dimethylpyrazolo[1,5-a]-
pyrimidine-3,7-diamine; pyrazolo[1,5-a]pyrimidine-3,5-diamine; 2,7-dimethylpyrazolo[1,5-a]pyrimidine-3,5-diamine; 3-aminopyrazolo[1,5-a]pyrimidin-7-ol; 3-aminopyrazolo[1,5-a]pyrimidine-5-ol; 2-(3-aminopyrazolo [1,5-a]pyrimidin-7-ylamino)ethanol, 2-(7-amino-pyrazolo[1,5-a]pyrimidin-3-ylamino)ethanol, 2-[(3-aminopyrazolo[1,5-a]pyrimidin-7-yl)(2-hydroxy-ethyl)amino]ethanol, 2-[(7-aminopyrazolo[1,5-a]-pyrimidin-3-yl)(2-hydroxyethyl)amino]ethanol, 5,6-dimethylpyrazolo[1,5-a]pyrimidine-3,7-diamine, 2,6-dimethylpyrazolo[1,5-a]pyrimidine-3,7-diamine, 2,5,N7,N7-tetramethylpyrazolo[1,5-a]pyrimidine-3,7-diamine, 3-amino-5-methyl-7-(imidazolylpropyl-amino)pyrazolo[1,5-a]pyrimidine and their addition salts with an acid and their tautomeric forms, when a tautomeric equilibrium exists.
Mention may be made, among pyrazole derivatives, of the compounds disclosed in Patents DE 3 843 892 and DE 4 133 957 and Patent Applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and DE 195 43 988, such as 4,5-diamino-l-methylpyrazole, 4,5-diamino-l-(ß-hydroxyethyl)pyrazole, 3,4-diamino-pyrazole, 4,5-diamino-l-(4'-chlorobenzyl)pyrazole, 4,5-diamino-l,3-dimethylpyrazole, 4,5-diamino-3-methyl-1-phenylpyrazole, 4,5-diamino-l-methyl-3-phenyl-pyrazole, 4-amino-l,3-dimethyl-5-hydrazinopyrazole, l-benzyl-4,5-diamino-3-methylpyrazole, 4,5-diamino-
3-(tert-butyl)-1-methylpyrazole, 4,5-diamino-l-(tert-
butyl)-3-methylpyrazole, 4,5-diamino-l-(ß-hydroxy-
ethyl)-3-methylpyrazole, 4,5-diamino-l-ethyl-3-methyl-
pyrazole, 4,5-diamino-l-ethyl-3-(4'-methoxyphenyl)-
pyrazole, 4,5-diamino-l-ethyl-3-(hydroxymethyl)-
pyrazole, 4,5-diamino-3-hydroxymethyl-l-methylpyrazole,
4,5-diamino-3-hydroxymethyl-l-isopropylpyrazole,
4,5-diamino-3-methyl-l-isopropylpyrazole, 4-amino-
5-(2'-aminoethyl)amino-1,3-dimethylpyrazole, 3,4,5-tri-
aminopyrazole, l-methyl-3,4,5-triaminopyrazole,
3,5-diamino-l-methyl-4-(methylamino)pyrazole,
3,5-diamino-4-([3-hydroxyethyl)amino-1-methylpyrazole
and their addition salts with an acid.
Mention may be made, among indole or indoline derivatives, of the compounds disclosed in Patent DE 10240758, such as 5,6-dihydroxyindole or 5,6-dihydroxyindoline.
The oxidation base or bases are generally each present in an amount of between 0.001 and 10% by weight approximately of the total weight of the dyeing composition, preferably between 0.005 and 6%.
Mention may in particular be made, as couplers present in the dyeing composition, of meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene couplers or heterocyclic couplers and their addition salts.
Mention may be made, by way of example, of 2-methyl-5-aminophenol, 5-N-(ß-hydroxyethyl)amino-2-methylphenol, 6-chloro-2-methyl-5-aminophenol, 3-aminophenol, 1,3-dihydroxybenzene, 1,3-dihydroxy-2-methylbenzene, 4-chloro-l,3-dihydroxybenzene, 2,4-diamino-l-(ß-hydroxyethyloxy)benzene, 2-amino-4-(ß-hydroxyethylamino)-1-methoxybenzene, 1,3-diamino-benzene, 1,3-bis(2,4-diaminophenoxy)propane, 3-ureido-aniline, 3-ureido-l-dimethylaminobenzene, sesamol, l-ß-hydroxyethylamino-3,4-methylenedioxybenzene, α-naphthol, 2-methyl-l-naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-3-hydroxypyridine, 6-hydroxybenzomorpholine, 3,5-diamino-2,6-dimethoxypyridine, 1-N-(ß-hydroxy-ethyl)amino-3,4-methylenedioxybenzene, 2,6-bis-(ß-hydroxyethylamino)toluene and their addition salts with an acid.
In the composition of the present invention, the coupler or couplers are each generally present in an amount of between 0.001 and 10% by weight approximately of the total weight of the dyeing composition, preferably between 0.005 and 6%.
Generally, the addition salts of the oxidation bases and couplers which can be used in the context of the invention are chosen in particular from the addition salts with an acid, such as hydrochlorides, hydrobromides, sulphates, citrates,
succinates, tartrates, lactates, tosylates, benzene-sulphonates, phosphates and acetates, and the addition salts with a base, such as sodium hydroxide, potassium hydroxide, aqueous ammonia, amines or alkanolamines.
The dyeing composition can additionally comprise direct dyes. These direct dyes of use according to the invention are chosen, for example, from neutral, acid or cationic nitrobenzene direct dyes, neutral, acid or cationic azo direct dyes, neutral, acid or cationic quinone and in particular anthraquinone direct dyes, azine direct dyes, triarylmethane direct dyes, indoamine direct dyes and natural direct dyes.
Mention may be made, among benzene direct dyes, without implied limitation, of the following compounds:
1,4-diamino-2-nitrobenzene, l-amino-2-nitro-4-(ß-hydroxyethylamino)benzene, l-amino-2-nitro-4-(bis(ß~ hydroxyethyl)amino)benzene, 1,4-bis(ß-hydroxyethyl-amino)-2-nitrobenzene, 1-(ß-hydroxyethylamino)-2-nitro-4-(bis(ß-hydroxyethyl)amino)benzene, 1-(ß-hydroxyethyl-amino)-2-nitro-4-aminobenzene, 1-(ß-hydroxyethylamino)-2-nitro-4-((ethyl)(ß-hydroxyethyl)amino)benzene, l-amino-3-methyl-4-(ß-hydroxyethylamino)-6-nitro-benzene, l-amino-2-nitro-4-(ß-hydroxyethylamino)-5-chlorobenzene, 1,2-diamino-4-nitrobenzene, 1-amino-2- (ß-hydroxyethylamino)-5-nitrobenzene, 1,2-bis-
(ß-hydroxyethylamino)-4-nitrobenzene, l-amino-2-(tris-(hydroxymethyl)methylamino)-5-nitrobenzene, 1-hydroxy-2-amino-5-nitrobenzene, l-hydroxy-2-amino-4-nitrobenzene, l-hydroxy-3-nitro-4-aminobenzene, 1-hydroxy-2-amino-4,6-dinitrobenzene, 1-(ß-hydroxyethyloxy)-2-(ß-hydroxyethylamino)-5-nitrobenzene, 1-methoxy-2-(ß-hydroxyethylamino)-5-nitrobenzene, 1-(ß-hydroxy-ethyloxy)-3-methylamino-4-nitrobenzene, 1- (P,y-di-hydroxypropyloxy)-3-methylamino-4-nitrobenzene, 1-(ß-hydroxyethylamino)-4- (p,y-dihydroxypropyloxy)-2-nitrobenzene, 1- (P,y-dihydroxypropylamino)-4-tri-fluoromethyl-2-nitrobenzene, 1-(ß-hydroxyethylamino)-4-trifluoromethyl-2-nitrobenzene, 1-(ß-hydroxyethyl-amino)-3-methyl-2-nitrobenzene, 1-(ß-aminoethylamino)-5-methoxy-2-nitrobenzene, l-hydroxy-2-chloro-6-ethyl-amino-4-nitrobenzene, l-hydroxy-2-chloro-6-amino-4-nitrobenzene, l-hydroxy-6-(bis(ß-hydroxyethyl)amino)-3-nitrobenzene, 1- (ß-hydroxyethylamino)-2-nitrobenzene and l-hydroxy-4-(ß-hydroxyethylamino)-3-nitrobenzene.
Mention may be made, among azo direct dyes, of the cationic azo dyes disclosed in Patent Applications WO 95/15144, WO 95/01772 and EP 714 954, the content of which forms an integral part of the invention.
Mention may very particularly be made, among these compounds, of the following dyes:
1,3-dimethyl-2-[[4-(dimethylamino)phenyl]-
azo]-lH-imidazolium chloride, 1,3-dimethyl-2-[(4-aminophenyl)azo]-lH-imidazolium chloride or l-methyl-4-[(methylphenylhydrazono)methyl]pyridinium methyl sulphate.
Mention may also be made, among azo direct dyes, of the following dyes, described in the Colour Index International, 3rd edition:
Disperse Red 17, Acid Yellow 9, Acid Black 1, Basic Red 22, Basic Red 76, Basic Yellow 57, Basic Brown 16, Acid Yellow 36, Acid Orange 7, Acid Red 33, Acid Red 35, Basic Brown 17, Acid Yellow 23, Acid Orange 24 or Disperse Black 9.
Mention may also be made of l-(4'-amino-diphenylazo)-2-methyl-4-(bis(ß-hydroxyethyl)amino)-benzene and 4-hydroxy-3-(2-methoxyphenylazo)-1-naphthalenesulphonic acid.
Mention may be made, among quinone direct dyes, of the following dyes:
Disperse Red 15, Solvent Violet 13, Acid Violet 43, Disperse Violet 1, Disperse Violet 4, Disperse Blue 1, Disperse Violet 8, Disperse Blue 3, Disperse Red 11, Acid Blue 62, Disperse Blue 7, Basic Blue 22, Disperse Violet 15 or Basic Blue 99, and the following compounds:
l-N-methylmorpholiniumpropylamino-4-hydroxy-anthraquinone, l-aminopropylamino-4-(methylamino)-anthraquinone, 1-(aminopropylamino)anthraquinone,
5-(ß-hydroxyethyl)-1,4-diaminoanthraquinone, 2-(amino-ethylamino)anthraquinone or 1,4-bis (p,y-dihydroxy-propylamino)anthraquinone.
Mention may be made, among azine dyes, of the following compounds:
Basic Blue 17 and Basic Red 2.
Mention may be made, among triarylmethane dyes, of the following compounds:
Basic Green 1, Acid Blue 9, Basic Violet 3, Basic Violet 14, Basic Blue 7, Acid Violet 49, Basic Blue 26 or Acid Blue 7.
Mention may be made, among indoamine dyes, of the following compounds:
- 2-(ß-hydroxyethylamino)-5-[4'-(bis-(ß-hydroxyethyl)amino)anilino]-1,4-benzoquinone
- 2-(ß-hydroxyethylamino)-5-(2'-methoxy-4'-aminoanilino)-1,4-benzoquinone
- 3-[N- (2'-chloro-4'-hydroxyphenyl)acetylamino]-6-methoxy-l,4-benzoquinone imine
- 3- [N-[3'-chloro-4'-(methylamino)phenyl]ureido] -6-methyl-l,4-benzoquinone imine
- 3-[[4'-[N-(ethyl, carbamylmethyl)amino]-phenyl]ureido]-6-methyl-l,4-benzoquinone imine.
The direct dye or dyes preferably represent from 0.001 to 20% by weight approximately of the total weight of the ready-for-use composition and more preferably still from 0.005 to 10% by weight
approximately.
At the time of use, the oxidation dyeing composition as defined above is mixed with an oxidizing agent, such as hydrogen peroxide, persalts, such as persulphates, or an oxidase enzyme, such as uricase or laccase.
According to a specific embodiment, the composition is a direct dyeing composition, that is to say devoid of oxidation base and of coupler, comprising one or more direct dyes as defined above in a cosmetic medium comprising at least one basifying agent. This composition can additionally comprise an oxidizing agent, such as hydrogen peroxide, before obtaining lightening of the keratinous fibres.
The medium appropriate for dyeing, also referred to as dyeing vehicle, is generally composed of water or of a mixture of water and of at least one organic solvent in order to dissolve the compounds which would not be sufficiently soluble in water. Mention may be made, as organic solvent, for example, of lower C1-C4 alkanols, such as ethanol and isopropanol; polyols and polyol ethers, such as 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether, diethylene glycol monoethyl ether or diethylene glycol monomethyl ether; and aromatic alcohols, such as benzyl alcohol or phenoxyethanol, and their mixtures.
The solvents are preferably present in proportions preferably of between 1 and 40% by weight approximately with respect to the total weight of the dyeing composition and more preferably still between 5 and 30% by weight approximately.
The dyeing composition in accordance with the invention can also include various adjuvants conventionally used in compositions for dyeing the hair, such as anionic, cationic, nonionic, amphoteric or zwitterionic surface-active agents or their mixtures, anionic, cationic, nonionic, amphoteric or zwitterionic polymers or their mixtures, inorganic or organic thickening agents and in particular anionic, cationic, nonionic and amphoteric polymeric associative thickeners, antioxidants, penetration agents, sequestering agents, fragrances, buffers, dispersing agents, conditioning agents, such as, for example, volatile or nonvolatile and modified or unmodified silicones, film-forming agents, ceramides, preservatives or opacifying agents.
The above adjuvants are generally present in an amount, for each of them, of between 0.01 and 20% by weight relative to the weight of the composition.
The dyeing composition can be provided in various forms, such as in the form of liquids, of creams or of gels or in any other form appropriate for carrying out dyeing of keratinous fibres and especially
of human hair.
In particular, in the embodiment presented in Figure 2, a flexible sheet 17 formed from the material 1 is sealed via the first outer structure 6, which comprises, for example, polyolefins or is made of polyolefins, to a bottom part 18, so as to form a lid of the said bottom part 18, the whole delimiting a housing for a packaging device 19 suitable for holding a cosmetic product and in particular a composition for dyeing keratinous fibres.
In fact, an outer face 20 of this lid is formed by the second outer structure 2 of the material 1 forming the flexible sheet 17, while the first outer structure 6 of the material 1 forms an inner face 21 delimiting at least in part the said housing, this inner face 21 being brought into contact with the said product.
In particular, the bottom part 18 is made of a rigid material embossed so as to exhibit a hollow delimiting in part the said housing, this hollow being capable of holding an amount of product and of resting, via this bottom part, on a flat surface. In particular, the flexible sheet 17 is sealed to a shoulder 22 of the bottom part 18, this shoulder 22 delimiting an opening of the said housing closed off by the said flexible sheet 17.
All known processes (heat sealing,
ultrasound, induction heating, high frequency heating) are suitable for the closing off (sealing). Preferably, this closing off provides hermetic closure of the packaging device 19, the product being hermetically present in the said housing. The opening of such a device thus closed can be carried out, for example, by cutting or peeling or tearing, for example piercing, the flexible sheet 17.
In an alternative form, represented in Figure 3, the material 1 is used to produce at least one of the sachets 30 and 31 possessing flexible sheets of a packaging device 32 as disclosed in Patent FR 2 830 520, incorporated here by reference. In particular such a device 32 is designed for the joint dispensing of the first and second products packaged separately in the said sachets 30 and 31, these sachets being fitted into a stage 33, such that a dispensing means 34 of the device 32 is movable with respect to this stage 33. The device 32 is configured so as to make possible the irreversible change from a first configuration, in which the first and second sachets are isolated from at least one dispensing orifice 35 formed by the said dispensing means 34, to a second configuration, in which the first and second containers are in communication with the said dispensing orifice 35.
According to a first embodiment of the
sachets such that 30 and 31 by means of the material 1, two sheets of the same size are cut out from the material 1, these two sheets subsequently being superimposed and attached to one another along their periphery. The sheets are attached to one another so that the second outer structure 2 defines the outer perimeter of the sachet, while the first outer structure 6 defines the inner perimeter of the sachet intended to be brought into contact with the product.
Alternatively, such a sachet can be obtained by folding over itself a sheet cut out from the material 1, in such a way that two regions of this sheet, folded over one another, are attached to one another along their periphery. Here again, the sheet is arranged in such a way that the first outer structure 6 defines an inner perimeter of the sachet thus formed.
In Figure 4, a sachet 40, such as the sachets 30 or 31, is equipped with an airless pump 41 such that the actuating of this pump 41 makes possible the dispensing of the product present in the said housing 42 delimited by the inner perimeter 43 of the sachet. In particular, the pump 41 is installed between two sheets, 44 and 45 respectively, cut out from the material 1 in order to form the said sachet 40, the inner perimeter 43 of the sachet being formed by the respective first outer structures, such as 6, of these two sheets. Preferably, these first outer structures,
such as 6, are welded in a leaktight manner to the outer perimeter of the body of the pump 41, so as to provide a leaktight assembly.
The sheets 4 4 and 4 5 cut out from the material 1 are flexible, thus conferring flexible walls on the said sachet, the walls of the sachet then being crushed on themselves as such a sachet is emptied by the actuation of the said pump 41. As the pump 41 is airless, the dispensing of product results in a gradual reduction in the internal volume of the said housing 42, the sheets 44 and 45 collapsing on one another.
Preferably, the pump 41 can be equipped with an actuating means 46 which makes it possible to facilitate the manual actuation of the said pump for the purpose of dispensing the product.
The sachet 40 is preferably positioned in a rigid frame 47 so as to be able to be stored vertically and thus to improve the emptying of the sachet 40. The rigid frame 47 is produced, for example, from material such as board. It defines an internal volume capable of receiving the said sachet 40 so that the latter is suspended from an upper plate 48 and spreads out inside the said frame without being subjected therein to a stress exerted on its outer perimeter.
In an alternative form (not represented), the pump 41 can be replaced in a sachet such as 40 by a body comprising a passage for making possible the
dispensing of product, the sheets 44 and 45 then being welded to the outer perimeter of this body.
For example, this body constitutes a connecting means capable of being fitted to a means for dispensing the product enclosed in the device. For example, the body is equipped with a valve which closes off the said passage in a leaktight manner, it being possible for this valve to be opened when the said sachet is fitted to the said dispensing means.
In an alternative form, this passage can be closed off with a stopper and the departure of the product from such a sachet 40 can then be obtained by simple pressure exerted by the user on the outer perimeter of the sachet after having detached the said stopper from its body.
Throughout the description, the expression "comprising a" should be regarded as being synonymous with "comprising at least one", unless otherwise specified.

CLAIMS
1. Packaging device (19, 32, 40)
comprising:
i) at least one flexible sheet (17, 30, 31, 44, 45) delimiting at least in part a housing, the said flexible sheet forming a multilayer complex (1) comprising:
a) a metal layer (4);
b) a bonding agent (5) comprising a copolymer comprising at least 7% by weight of carboxylic and/or carboxylate units, it being possible for the carboxylic units to be in the acid form or in the form of salts, and
c) a layer (6) of a non-metallic material bonded to the metal layer via the said bonding agent,
ii) a cosmetic composition positioned inside the housing.
2. Device according to Claim 1, characterized in that the carboxylate unit is an acrylate or methacrylate unit.
3. Device according to the preceding claim, characterized in that the acrylate unit is ethyl acrylate.
4. Device according to any one of Claims 1 to 3, characterized in that the carboxylic unit is acrylic or methacrylic acid.
5. Device according to any one of the preceding claims, characterized in that the copolymer comprises at least one second monomer exhibiting an alkylene unit, the alkyl chain of which comprises from 2 to 10 carbon atoms.
6. Device according to Claim 5, characterized in that the bonding agent is a copolymer of ethylene and of ethyl acrylate.
7. Device according to Claim 5, characterized in that the bonding agent is a copolymer of ethylene and of acrylic acid.
8. Device according to any one of the preceding claims, characterized in that the bonding agent comprises between 7% and 19%, more particularly between 8% and 11%, more specifically between 8.5% and 10.5%, and preferably 9.7%, by weight of an acrylic acid and/or of an acrylic ester.
9. Device according to any one of the preceding claims, characterized in that the layer of a non-metallic material is made of a thermoplastic, preferably a polymer, for example from polyethylene.
10. Device according to any one of the preceding claims, characterized in that the metal layer is made of aluminium or of an alloy comprising aluminium.
11. Device according to any one of the preceding claims, characterized in that the flexible
sheet exhibits a thickness of between 70 and 232 urn, such that
- the metal layer has a thickness of between 6 and 12 urn, preferably of the order of 12 um,
- the layer of bonding agent has a thickness of between 10 and 40 um, preferably of the order of
25 um,
- the layer of a non-metallic material has a
thickness of between 40 and 150 um, preferably of the
order of 75 um.
12. Device according to any one of the preceding claims, characterized in that it comprises a second outer structure (2) attached to the metal layer so as to form an outer face directed towards the outside of the said housing, this second outer structure being made of a thermoplastic, preferably a polymer, for example from poly(ethylene terephthalate).
13. Device according to the preceding claim, characterized in that the second outer structure is firmly attached to the metal layer via a layer of a second bonding agent (3), in particular a polyurethane-based adhesive.
14. Device according to the preceding claim, characterized in that the layer of second bonding agent has a thickness of between 2 and 5 µm, preferably of the order of 4 µm.
15. Device according to any one of Claims 12
to 14, characterized in that the second outer structure has a thickness of between 12 and 25 urn, preferably of the order of 12 µm.
16. Device according to any one of the preceding claims, characterized in that the multilayer complex of the flexible sheet is obtained by laminating.
17. Device according to any one of the preceding claims, characterized in that the bonding agent is extruded.
18. Device according to any one of the preceding claims, characterized in that the flexible sheet is at least in part deformable elastically.
19. Device according to any one of the preceding claims, characterized in that it comprises a bottom part exhibiting a housing capable of receiving the said product, this bottom part being closed off by the said flexible sheet, for example sealed over one side of this bottom part, in order to delimit the said housing.
20. Device according to any one of the preceding claims, characterized in that it is provided in the form of a sachet comprising at least one second wall sealed to the flexible sheet in order to delimit the said housing inside which the product is enclosed, this second wall preferably being produced from the same material as the flexible sheet.
21. Device according to any one of the preceding claims, characterized in that it comprises a dispensing means which makes possible the dispensing of the product enclosed in the device.
22. Device according to the preceding claim, characterized in that the dispensing means is an airless pump.
23. Device according to any one of the preceding claims, characterized in that the cosmetic composition is alkaline.
24. Device according to any one of the preceding claims, characterized in that the product is a composition comprising a basifying agent.
25. Device according to Claim 24, in which the basifying agent is chosen from aqueous ammonia and/or ethanolamine and/or sodium silicate.
26. Device according to Claim 24 or 25, in which the composition additionally comprises at least one oxidation base and optionally at least one coupler.
27. Device according to Claim 24, 25 or 26, in which the composition comprises one or more direct dyes.
28. Use of a device according to any one of the preceding claims, for the leaktight packaging of an alkaline composition.
29. Use of a device according to any one of the preceding claims, for the leaktight packaging of a

composition comprising a basifying agent.
30. Use according to Claim 29, for the packaging of a composition comprising aqueous ammonia and/or ethanolamine and/or sodium silicate.
31. Use according to Claim 29 or 30, in which the composition additionally comprises at least one oxidation base and optionally at least one coupler,
32. Use according to any one of Claims 2 9 to 31, in which the composition comprises one or more direct dyes.