WO2013092379A1

WO2013092379A1 - Application device comprising a composition based on specific acrylic polymer and on silicone copolymer, and method for the treatment of keratinous fibres employing it

Info

Publication number: WO2013092379A1
Application number: PCT/EP2012/075414
Authority: WO
Inventors: Karen Teboul
Original assignee: L'oreal
Priority date: 2011-12-20
Filing date: 2012-12-13
Publication date: 2013-06-27
Also published as: FR2984096B1; FR2984096A1

Abstract

A subject-matter of the present invention is an application device for a composition for the treatment of keratinous fibres comprising an aqueous dispersion of particles of hybrid hydrophobic film-forming acrylic polymer and a linear block silicone copolymer, and also a method for the treatment of keratinous fibres employing such a device. The composition makes it possible to obtain a coating persistent towards shampooing operations, leaving the treated fibres individualized, with an improved cosmetic feel and a contribution of mass and volume.

Description

APPLICATION DEVICE COMPRISING A COMPOSITION BASED ON SPECIFIC ACRYLIC POLYMER AND ON SILICONE COPOLYMER, AND METHOD FOR THE TREATMENT OF KE RATI NOUS FIBRES EMPLOYING IT A subject-matter of the present invention is an application device for a non- colouring composition for the treatment of keratinous fibres comprising an aqueous dispersion of particles of specific acrylic polymer and a linear block silicone copolymer, and also a method for the treatment of keratinous fibres employing such a device.

The hair is generally damaged and embrittled by the action of external atmospheric agents such as light and bad weather, and by mechanical or chemical treatments, such as brushing, combing, bleaching, permanent-waving and/or dyeing. The result of this is that the hair is often difficult to manage and in particular is difficult to disentangle or to style, and a head of hair, even of lush hair, has difficulty in maintaining an attractive style due to the fact that the hair lacks vigour, volume and liveliness.

This deterioration in the hair is furthermore increased by the repetition of permanent hair colouring treatments, which consists in applying, to the hair, one or more dye precursors and an oxidizing agent.

Thus, in order to overcome this, it is now normal to use styling products which make it possible to condition the hair by giving it in particular body, mass or volume.

These styling products are generally hair cosmetic compositions comprising one or more polymers which exhibit a high affinity for the hair and which usually have the function of forming a film on the hair surface for the purpose of modifying its surface properties, in particular in order to condition it or in order to contribute specific optical properties.

One disadvantage related to the use of these hair compositions lies in the fact that the cosmetic effects conferred by such compositions have a tendency to disappear, in particular from the first shampooing.

In order to overcome this disadvantage, it is possible to envisage increasing the persistence of the deposited layer of polymers by directly carrying out a radical polymerization of certain monomers on the hair. However, the treatments thus obtained result in a deterioration in the fibre and the hair thus treated is generally difficult to disentangle.

Furthermore, it is known to coat the hair using a composition comprising an electrophilic monomer of cyanoacrylate type, in particular in Patent Application FR 2 833 489. Such a composition makes it possible to obtain completely coated and non- greasy hair. However, the coating obtained requires specific operating conditions, due to the reactivity of the electrophilic monomer. Furthermore, the coating obtained with these electrophilic monomers becomes tacky with fatty substances, such as sebum.

It is also known, in particular from the document EP 2 095 810, to improve the persistence of the deposited layer on the keratinous fibres by application of a composition comprising a pressure-sensitive adhesive silicone copolymer, better known under the name of BioPSA. The feel obtained with these copolymers is generally tacky. The hair treated with this type of composition exhibits a slightly rough, not completely natural, feel. Furthermore, the application of this type of composition is time-consuming and requires a stage of complete drying at a temperature greater than ambient temperature, for example with a hair dryer, necessary in order to obtain the persistent coating.

The document W092/21316 describes compositions based on silicone and latex. The results obtained from the compositions of this document are not, however, satisfactory in terms of coating effect and persistence of the properties, in particular with regard to shampooing operations.

Moreover, hair treatment products (gels, shampoos, hair care or styling products) are generally scented but exhibit a very limited persistence of the fragrance on the head of hair, the fragrance generally fading after a few minutes, in the best of cases a few hours.

Thus, the aim of the present invention is to develop a device for the treatment of keratinous fibres, in particular human keratinous fibres, such as the hair, which is easy to employ and which makes it possible to obtain coatings which are persistent towards shampooing operations and towards the various attacks which the hair may be subjected to, in particular blow drying and perspiration, while exhibiting the best toleration towards fatty substances, such as sebum, and while not developing a tacky nature, this coating furthermore being homogeneous and smooth on the keratinous fibres, leaving the latter completely individualized.

This aim is achieved with the present invention, a subject-matter of which is thus a device (1 ) for the application of a non-colouring composition for the treatment of keratinous fibres, comprising:

(i) an application means (2) which is capable of retaining an amount of the treatment composition (P) in a container (20), (ii) a holding member (4) which is capable of interacting with the application means (2) in order, during a longitudinal displacement of the device (1 ) relative to a keratinous fibre or to a combination of keratinous fibres, such as a lock, to keep the fibre or fibres engaged with the application means (2), so as to make possible the coating thereof with the treatment composition

(P).

(iii) the said application means (2) comprising an applicator end piece (30) mounted on the container (20) and comprising an outlet orifice (31 ) equipped with an opening/closing element (32) which, in a first position, closes off the said outlet orifice and which, in a second position, at least partly releases the said outlet orifice, the change from the first position to the second position taking place in response to a force exerted on the opening/closing element (32) by the engaging of the fibre or fibres between the holding member and this opening/closing element (32),

(iv) the said non-colouring treatment composition (P) comprising at least an aqueous dispersion of particles of at least one hybrid hydrophobic film- forming acrylic polymer and at least one linear block silicone copolymer. Another subject-matter of the invention is a method for the treatment of keratinous fibres comprising the application, to the fibre or fibres, of a treatment composition (P) included in a device as described above, the application optionally being followed by a drying of the fibres.

The term "at least one" is understood to mean "one or more".

The term "comprising a" is understood to mean "comprising at least one", unless otherwise specified.

The term "non-colouring composition" is understood to mean a composition which does not confer, on the keratinous fibres, a new colour via one or more colouring materials. The composition according to the invention thus does not comprise such materials and in particular comprises neither pigments nor oxidation dyes and, if it comprises soluble direct dyes, does so at a concentration (generally less than 0.005%) such that the composition is coloured without a colouring effect on the keratinous fibres.

It is possible, by the use of such a device, to deposit in a simple way the treatment composition included in it, without the risk of the product running, whether in the context of a self-application or of a treatment carried out by another person. The application is fast and efficient, without requiring the use of additional accessories, and the impregnation of the fibres is homogeneous, whatever their length.

Furthermore, the composition applied makes it possible to obtain a coating which is persistent towards shampooing operations while preserving the physical qualities of the keratinous fibre. Such a coating is in particular resistant to the external attacks which the fibres may be subjected to, such as blow drying and perspiration. It makes it possible in particular to obtain a smooth and homogeneous deposited layer. With the method of the invention, a persistent coating is obtained without it being necessary to dry the hair with a hair dryer. The hair, after application, is left in the open air; after a few seconds, the persistent coating is formed. The hairs are individualized.

The term "individualized fibres" is understood to mean fibres which, after application of the composition and drying, are not stuck together (or are all separated from one another) and thus do not form clumps, the coating being formed around virtually each fibre.

Device

The device according to the invention is particularly suited to making possible an application of a treatment product to one or more fibres.

The application can be carried out overall on a complete head of hair by operating successively on at least all the obvious locks of the said head of hair.

Preferably, the holding member can move with respect to the application means.

According to an alternative form, the holding member and the application means are connected by a connecting means and form a single piece

According to another alternative form, the holding member and the application means form two separate pieces.

Advantageously, the container comprising the composition comprises an annular narrowing to help it to be grasped between two fingers.

In accordance with a specific embodiment, the applicator end piece comprises a surface capable of storing and releasing the treatment composition.

Preferably, the surface of the holding member can be chosen to be greater than or equal to the surface of the applicator end piece.

Advantageously, the holding member comprises combing means.

Preferably, the change from the first position to the second position takes place in response to a force exerted axially on the opening/closing element. Preferably, the application means and the holding member can be chosen to be symmetrical with respect to one another in relation to an axis cutting the connecting means.

Reference may be made to the figures, which, however, are presented only by way of indication and without any implied limitation of the device.

In the figures:

Figure 1 : shows an exploded perspective view of a device according to the invention for the application to locks of a hair care product,

Figure 2: shows an exploded perspective view of another device according to the invention for the application to locks of a hair care product,

Figure 3: shows an exploded perspective view of the top part of the applicator,

Figure 4: shows a top view of the applicator in the released position (second position), Figure 5: shows a top view of the applicator in the closed-off position (first position), Figure 6: shows a perspective view of an opening/closing element in the released position (second position),

Figure 7: shows a perspective view of an opening/closing element in the closed-off position (first position),

Figure 8: shows a front view of the skirt of the applicator,

Figure 9: shows a top view of the skirt of the applicator,

Figure 10: shows a perspective view of a device according to the invention in one piece before use,

Figure 11 : shows a perspective view of a device according to the invention in two pieces before use,

Figure 12: shows a perspective view of a device according to the invention in one piece during use.

The device represented in Figures 1 and 2 comprises an application means 2 comprising the composition of use in the invention and a holding member 4. The application means 2 is known per se and is described in particular in US 5 961 665.

The application means 2 comprises a container 20 in the form of a small flexible or rigid bottle. Alternatively, a bottle made of thermoplastic material, for example of

PET, can be used. The bottle has, for example, a capacity of 6 ml. The bottle comprises a side wall in the form of a cylinder of revolution, one end of which is closed by a base 23. The second end is formed by a portion having a narrowed diameter, which ends in a free edge 24a defining an opening 25. An applicator end piece 30 is provided to be fitted onto the bottle and to be snap- fastened or screwed onto the opening 25 of the bottle. The end piece is provided in the form of a substantially cylindrical shell having a uniform circular diameter over a large part of its length. It could have any other form, for example a frustoconical form, becoming progressively smaller until it defines a circular portion. The end piece 30 has, for example, a diameter of approximately 15 mm. Axial ribs can be provided on the internal wall of the shell. They can comprise a radial indentation which, in the fitted position of the shell, will become housed in the opening 25 of the bottle, thereby allowing the shell to be snap-fastened onto the bottle. Alternatively, it is possible to provide for the internal wall of the shell to be supplied with a thread intended to interact with a thread provided on the neck of the bottle.

As can be seen in Figures 3 to 9, the end piece comprises a cylindrical skirt 34, which provides sealing between the opening 25 of the bottle and the outlet orifice 31. The skirt extends substantially axially from the cylindrical or frustoconical portion of the shell, around the seat 33, as far as a free edge 340 which forms a sealing lip. In the fitted position of the applicator end piece 30, the lip 340 will be supported in sealed fashion on the upper edge 24a. Thus, the sealing skirt does not overlap the bottle laterally, so that the presence of the skirt does not affect the lateral space requirement of the shell. A radial shoulder 341 is provided on the internal wall of the skirt 34 for receiving in abutment the opening/closing element 32. This is a continuous circular bead. It is quite clear that a discontinuous bead formed for example of portions which are angularly spaced apart can be used for receiving in abutment the closing element.

The end piece is advantageously obtained by moulding a single piece of a preferably thermoplastic material, in particular of a polyethylene, of a polypropylene, of a polyethylene terephthalate, of a polyvinyl chloride or of a polyamide.

The opening/closing element 32 comprises a spring 321 which is formed by helical turns, the lower part of which is integrally incorporated in a mounting ring 323. The lower edge 323a of the mounting ring 323 is in abutment against the radial shoulder 341 of the skirt 34. The upper part of the spring is integrally incorporated in a body hollow in form which ends with a frustoconical region 320 intended to be supported on the seat 33, thus forming a valve. The frustoconical region is extended by a stud 322 having a circular cross section, the end 322a of which can be slightly rounded in order not to damage the surface to be treated, with which it comes into direct contact. The diameter of the stud is less than the diameter of the dispensing orifice in order that the stud can easily slide through the orifice 31 , allowing product for dispensing to pass through. In the rest position, the stud 322 protrudes out of the orifice, so that its end 322a can be brought into direct contact with a surface to be treated or into indirect contact via a membrane 37.

The opening/closing element 32 is likewise obtained by moulding a single piece of a preferably thermoplastic material, in particular of a polyethylene, of a polypropylene, of a polyethylene terephthalate, of a polyvinyl chloride or of a polyamide.

In the fitted position of the opening/closing element, the lower edge 323a of the mounting ring is in abutment against the radial shoulder and the spring 321 is slightly compressed, in order to keep the frustoconical region 320 supported in sealed fashion on the seat 33, so as to prevent any leakage of product through the orifice 31 . When the stud is brought into contact with a surface to be treated, a force is exerted on the stud, the said force being transmitted to the spring so as to compress it. The stud is thus driven into the orifice 31 and the frustoconical portion disengages from the seat 33, as is represented in Figures 3 to 7.

The membrane 37 can be porous or non-porous, be carried on the end piece 30, for example have passing through it at least one orifice for dispensing the product, and be externally at least partially covered with a flocked surface, the membrane defining, with the end piece 30, an internal space which can comprise product to be dispensed.

The membrane can be flexible and/or mounted on the end piece 30 so as to exhibit the possibility of deformation and/or movement in relation to the support and/or to the reservoir, leading to a reduction in volume of the internal space of at least 0.1 ml.

As indicated in Figures 10 and 1 1 , in order to use the device, the user takes hold of the bottle, inverts it and applies the end piece to the lock. It then suffices for the user to prolong their hand movement in order to drive in the stud 322 and to disengage the frustoconical region 320 from the seat 33 in order at least partly to release the orifice 31 (Figure 3). For this, the user places their thumb in contact with the holding member 4. The product exits by gravity through the orifice. Since the orifice has a small diameter, the product flows onto the lock in a very localized manner, which makes it possible to apply the product with great accuracy. Next, the user moves the device while gripping the lock. As soon as the user moves the dispenser away from the lock or no longer exerts pressure with their thumb and as soon as the force exerted on the stud ceases, the spring returns to its rest position and the frustoconical portion returns to being supported on the seat. The product then stops flowing and air is drawn into the bottle before the valve is closed.

According to a specific embodiment, the holding member 4 comprises a circular cover 41 having a diameter greater than that of the membrane 37. It also comprises a connecting strip 50 made of soft or flexible material chosen so as to elastically lengthen by the distance necessary for the positioning of the lock. This strip 50 can be formed of elastomer, in particular of thermoplastic elastomer, such as a polyethylene elastomer. The strip 50 can be moulded in a single piece with the cover 41 or be connected to the cover 41 by adhesive bonding or welding.

The connecting means 50 can be composed in particular of film hinges or of hinges of the type having an attached pin or of the type having an element carried by either of the said first or second parts, the said element being mounted in rotation inside a recess formed in the other of the said base or the said cover 41 .

The cover 41 can exhibit a shape chosen from the following list: circular or non- circular, in particular oblong, oval, elliptical or polygonal, in particular square, rectangular, kidney-shaped, crenellated or star-shaped, with one or more grooves.

The cover 41 and the membrane 50 can be made of different materials. At least one can be made of a thermoplastic material, in particular one of the materials chosen from the group consisting of: PE, PP, POM, PA, PET and PBT.

The cover 41 can comprise at least one of the following application elements: bundle of bristles, felt, flock coating, foam or else other application elements such as studs or teeth. These application elements are positioned on the surface of the cover 41 , coming into contact with the lock.

These application elements can be positioned in the form of one or more lines or can be distributed in a periodic pattern. The application element can, for example, be a comb or a brush.

The application elements can in particular be attached by adhesive bonding, stapling or overmoulding onto the part 41. The application elements can also comprise a flocked tip.

The holding member 4 can additionally comprise a grasping member which favours the grasping of the device with a predefined orientation. The grasping member can comprise at least one region for receiving a finger, in particular a plane or a cavity, which extends generally substantially parallel to an axis having the greater dimension of a cross section of the flexible part.

According to an alternative which is not represented, the geometric articulation axis is defined by a single film hinge, while the elastic return is ensured by two lateral connecting strips positioned on either side of the film hinge. The choice of such and such a configuration depends to a large extent on the cross section of the container.

When the connecting member 4 does not comprise a connecting means 50, the cover 41 can be welded, moulded or adhesively bonded to a ring or to a fingerstall, into which at least one finger can be inserted. In this case, the ring or the fingerstall is slipped onto the thumb of a hand of the user and the application means 2 is gripped between the other fingers of the same hand. The lock to be coated is positioned next to the membrane 37 of the application means 2. The thumb is bent back in order to pinch the lock between the membrane 37 and the cover 41 . Manual pressure is exerted along the axis of the container 20 and at right angles to the membrane 37. The user moves their hand away from the head while maintaining this pressure. The user releases the said pressure in order to stop the application to the lock.

The application means 2 can comprise a foam end piece which can be replaced by an end piece of roll-on type (the roll-on can be a sphere or a cylinder or else can have an ovoid shape of the rugby ball type).

With the device according to the invention, the hand (for the hairdresser or a person) can be positioned in the manner most appropriate to the choice of the user, with or without the annular narrowing to favour the grasping of the application means

2. Composition for treating keratinous fibres

Aqueous dispersion of particles of hybrid hydrophobic film-forming acrylic polymer

The term "polymer" is understood to mean, within the meaning of the invention, a compound corresponding to the repetition of one or more units (these units resulting from compounds known as monomers). This or these unit(s) is (are) repeated at least twice and preferably at least 3 times.

The term "film-forming polymer" is understood to mean a polymer which is capable of forming, by itself alone or in the presence of an additional film-forming agent, a macroscopically continuous film on a support, in particular on keratinous substances, and preferably a cohesive film.

The term "hydrophobic polymer" is understood to mean a polymer having a solubility in water at 25°C of less than 1 % by weight.

The dispersion can be a simple dispersion in the aqueous medium of the composition. Mention may be made, as specific case of dispersions, of latexes.

The term "hybrid acrylic polymer" is understood to mean, within the meaning of the present invention, a polymer synthesized from at least one compound (i) chosen from monomers having at least one (meth)acrylic acid group and/or esters of these acid monomers and/or amides of these acid monomers and from at least one compound (ii) other than the compounds (i), i.e. which does not comprises (meth)acrylic acid group and/or esters of these acid monomers and/or amides of these acid monomers.

The (meth)acrylic acid esters (also known as (meth)acrylates) are advantageously chosen from alkyl (meth)acrylates, in particular C1-C30, preferably d- C₂o and better still C1-C1₀ alkyl (meth)acrylates, aryl (meth)acrylates, in particular C₆- C1₀ aryl (meth)acrylates, or hydroxyalkyl (meth)acrylates, in particular C₂-C₆ hydroxyalkyl (meth)acrylates.

Mention may be made, among alkyl (meth)acrylates, of methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate or cyclohexyl methacrylate.

Mention may be made, among hydroxyalkyl (meth)acrylates, of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, hydroxyethyl methacrylate or 2-hydroxypropyl methacrylate.

Mention may be made, among aryl (meth)acrylates, of benzyl acrylate and phenyl acrylate.

The (meth)acrylic acid esters which are particularly preferred are the alkyl (meth)acrylates.

According to the present invention, the alkyl group of the esters can be either fluorinated or perfluorinated, that is to say that some or all of the hydrogen atoms of the alkyl group are replaced with fluorine atoms.

Mention may be made, as amides of the acid monomers, for example, of (meth)acrylamides and in particular N-alkyl(meth)acrylamides, especially N-(C₂-Ci₂ alkyl)(meth)acrylamides. Mention may be made, among N-alkyl(meth)acrylamides, of N-ethylacrylamide, N-(t-butyl)acrylamide, N-(t-octyl)acrylamide and N- undecylacrylamide.

Mention will be made, as compounds (ii) other than the compounds (i), for example, of the styrene monomers.

In particular, the acrylic polymer can be a styrene/acrylate copolymer and especially a polymer chosen from the copolymers resulting from the polymerization of at least one styrene monomer and at least one C1-C20 and preferably C-i-C-io alkyl acrylate monomer.

Mention may be made, as styrene monomer which can be used in the invention, of styrene or omethylstyrene and preferably styrene.

The C-I-C-IO alkyl acrylate monomer can be chosen from methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate or 2-ethylhexyl acrylate.

Mention may be made, as acrylic polymer synthesized with styrene monomers, of the styrene/acrylate(s) copolymers sold under the name Joncryl 77 by BASF, under the name Yodosol GH41 F by Akzo Nobel and under the name Syntran 5760 CG by Interpolymer.

Mention may also be made, as compound (ii), of the compounds which interact by a process other than the radical polymerization of unsaturated compounds or the compounds resulting from such a process. Such a process can, for example, be a polycondensation. Mention may be made, as polycondensation, of the formation of polyurethanes, polyesters or polyamides. In addition to the acrylic monomer or monomers, the hybrid hydrophobic film-forming polymer of the invention will then comprise the compound resulting from the polycondensation process or the compounds which interact in the polycondensation process.

Mention may in particular be made, as hybrid film-forming acrylic copolymers of this type, of that or under the reference Hybridur 875 Polymer Dispersion by Air Products and Chemicals.

Use may also be made, as hybrid hydrophobic film-forming acrylic copolymer, of the product sold under the reference Primal HG 1000 by Dow.

According to a specific embodiment, the hybrid film-forming acrylic polymer is a copolymer of (meth)acrylic acid ester(s) and of styrene.

The hybrid hydrophobic film-forming acrylic polymer or polymers in aqueous dispersion can be present in a content, as active materials of polymers, ranging from 0.1 % to 30% by weight, better still from 0.5% to 20% by weight and even better still from 1 % to 15% by weight, with respect to the total weight of the composition.

Linear block silicone copolymer

The silicone copolymer used in the composition according to the invention is a linear block copolymer, that is to say a non-crosslinked copolymer, obtained by chain extension and not by crosslinking.

The term "block copolymer" (or "sequential copolymer") denotes a polymer comprising at least two distinct blocks (sequences). Each block of the polymer results from one type of monomer or from several types of different monomers. This means that each block can be composed of a homopolymer or of a copolymer, it being possible for this copolymer constituting the block to be in its turn random or alternating. The silicone copolymer used in the composition according to the invention preferably comprises at least two distinct silicone blocks, each block of the polymer resulting from one type of silicone monomer or from several types of different silicone monomers, such as mentioned below.

It should also be noted that the copolymer is "linear"; in other words, the structure of the polymer is neither branched nor star-shaped nor grafted.

The linear block silicone copolymer is advantageously provided in the form of particles in dispersion in an aqueous medium.

The aqueous dispersion of block copolymer particles is a silicone-in-water (Sil/W) emulsion, the oily globules of which are composed of a silicone of high viscosity, so that these globules appear to form "soft particles".

The size of the linear block silicone copolymer particles can vary widely. Preferably, in the present patent application, the linear block silicone copolymer particles generally exhibit a number-average size of less than or equal to 2 microns and preferably of less than or equal to 1 micron.

The aqueous dispersions of linear block silicone copolymer particles used in the composition according to the invention can be chosen in particular from those described in the document EP-A-874 017, the teaching of which is incorporated here by reference. According to this document, it is possible in particular to obtain the silicone copolymers constituting these particles by a chain extension reaction in the presence of a catalyst, starting from at least: - (a) one polysiloxane (i) having at least one reactive group and preferably one or two reactive groups per molecule; and

- (b) one organosilicone compound (ii) which reacts with the polysiloxane (i) by a chain extension reaction.

In particular, the polysiloxane (i) is chosen from the compounds of formula (I):

in which R-i and R₂ represent, independently of one another, a hydrocarbon group having from 1 to 20 carbon atoms and preferably from 1 to 10 carbon atoms, such as methyl, ethyl, propyl or butyl, or an aryl group, such as phenyl, or a reactive group, and n is an integer greater than 1 , provided that there are on average between one and two reactive groups per polymer.

The term "reactive group" is understood to mean any group capable of reacting with the organosilicone compound (ii) to form a block copolymer. Mention may be made, as reactive groups, of hydrogen; aliphatically unsaturated groups, in particular vinyl, allyl or hexenyl groups; the hydroxyl group; alkoxy groups, such as methoxy, ethoxy or propoxy groups; alkoxyalkoxy groups; the acetoxy group; amino groups, and their mixtures. Preferably, more than 90% and better still more than 98% of reactive groups are at the chain end, that is to say that the R₂ radicals generally constitute more than 90% and even 98% of the reactive groups.

n can in particular be an integer ranging from 5 to 30, preferably from 10 to 30 and better still from 15 to 25.

The polysiloxanes of formula (I) are linear polymers, that is to say comprising few branchings and generally less than 2 mol% of siloxane units. Furthermore, the Ri and R₂ groups can optionally be substituted by amino groups, epoxy groups or sulfur- comprising, silicon-comprising or oxygen-comprising groups.

Preferably, at least 80% of the Ri groups are alkyl groups and better still methyl groups.

Preferably, the reactive group R₂ at the chain end is an aliphatically unsaturated group and in particular a vinyl group.

Mention may in particular be made, as polysiloxanes (i), of dimethylvinylsiloxy- polydimethylsiloxane, a compound of formula (I) in which the Ri radicals are methyl radicals and the R₂ radicals at the chain end are vinyl radicals while the other two R₂ radicals are methyl radicals.

The organosilicone compound (ii) can be chosen from polysiloxanes of formula (I) or compounds acting as chain-extending agent. If it is a compound of formula (I), the polysiloxane (i) will comprise a first reactive group and the organosilicone compound (ii) will comprise a second reactive group which will react with the first. If it is a chain-extending agent, it can be a silane, a siloxane (disiloxane or trisiloxane) or a silazane. Preferably, the organosilicone compound (ii) is a liquid organohydropolysiloxane of formula (II):

where n is an integer greater than 1 and preferably greater than 10, for example ranging from 2 to 100, preferably from 10 to 30 and better still from 15 to 25. According to a specific embodiment of the invention, n is equal to 20.

The silicone block copolymers used according to the invention are advantageously devoid of oxyalkylene groups, in particular devoid of oxyethylene and/or oxypropylene groups.

The catalyst of the reaction between the polysiloxane and the organosilicone compound can be chosen from metals and in particular from platinum, rhodium, tin, titanium, copper and lead. It is preferably platinum or rhodium.

The dispersion of silicone copolymer particles used in the composition according to the invention can in particular be obtained, for example, by mixing (a) water, (b) at least one emulsifier, (c) the polysiloxane (i), (d) the organosilicone compound (ii) and (e) a catalyst. Preferably, one of the constituents (c), (d) or (e) is added last to the mixture, in order for the chain extension reaction to begin only in the dispersion.

Mention may be made, as emulsifiers capable of being used in the preparation process described above in order to obtain the aqueous dispersion of particles, of non- ionic or ionic (anionic, cationic or amphoteric) emulsifiers. They are preferably non- ionic emulsifiers which can be chosen from polyalkylene glycol ethers of fatty alcohols comprising from 8 to 30 carbon atoms and preferably from 10 to 22 carbon atoms; polyoxyalkylenated and in particular polyoxyethylenated sorbitan alkyl esters, where the alkyl radical comprises from 8 to 30 carbon atoms and preferably from 10 to 22 carbon atoms; polyoxyalkylenated and in particular polyoxyethylenated alkyl esters, where the alkyl radical comprises from 8 to 30 carbon atoms and preferably from 10 to 22 carbon atoms; polyethylene glycols; polypropylene glycols; diethylene glycols; and their mixtures. The amount of emulsifier(s) is generally from 1 to 30% by weight, with respect to the total weight of the reaction mixture.

The emulsifier used to obtain the aqueous dispersion of particles is preferably chosen from polyethylene glycol ethers of fatty alcohols and their mixtures and in particular polyethylene glycol ethers of alcohols comprising 12 or 13 carbon atoms and from 2 to 100 oxyethylene units and preferably from 3 to 50 oxyethylene units, and their mixtures. Mention may be made, for example, of C12-C13 Pareth-3, C12-C13 Pareth-23 and their mixtures.

According to a specific embodiment of the invention, the dispersion of silicone copolymer particles is obtained from dimethylvinylsiloxy-polydimethylsiloxane (or divinyldimethicone), as compound (i), and from the compound of formula (II) with preferably n=20, as compound (ii), preferably in the presence of a catalyst of platinum type, and the dispersion of particles is preferably obtained in the presence of C12-C13 Pareth-3 and C12-C1₃ Pareth-23, as emulsifiers.

Use may in particular be made, as dispersion of silicone copolymer particles, of the product sold under the name HMW 2220 by Dow Corning (CTFA name: divinyldimethicone/dimethicone copolymer/Ci₂-Ci₃ Pareth-3/Ci₂-Ci₃ Pareth-23), which is a 60% aqueous dispersion of divinyldimethicone/dimethicone copolymer comprising Ci₂-Ci₃ Pareth-3 and Ci₂-Ci₃ Pareth-23, the said dispersion comprising approximately 60% by weight of copolymer, 2.8% by weight of Ci₂-Ci₃ Pareth-23, 2% by weight of Ci₂-Ci₃ Pareth-3 and 0.31 % by weight of preservatives, the remainder to 100% being water.

The linear block silicone copolymer or copolymers can be present, for example, in an amount, as polymeric active materials, ranging from 0.1 % to 30% by weight, better still from 0.5% to 20% by weight and even better still from 1 % to 15% by weight, with respect to the total weight of the composition.

According to one embodiment, the hybrid hydrophobic film-forming acrylic polymer or polymers and the linear block silicone copolymer or copolymers are present in a hybrid hydrophobic film-forming acrylic polymer(s) to linear block silicone copolymer(s) ratio by weight (as active materials of polymers) ranging from 0.2 to 10, better still from 0.5 to 5 and even better still from 1 to 3. When the hybrid hydrophobic film-forming acrylic polymer has a glass transition temperature which is too high for the desired use, for example a Tg of greater than 40°C, a plasticizer can be combined therewith so as to lower this temperature of the mixture used. The plasticizer can be chosen from the plasticizers normally used in the field of application and in particular from compounds which can be solvents for the polymer.

Preferably, the plasticizer has a molecular weight of less than or equal to 5000 g/mol, preferably of less than or equal to 2000 g/mol, preferably of less than or equal to 1000 g/mol and more preferably of less than or equal to 900 g/mol. The plasticizer advantageously has a molecular weight of greater than or equal to 100 g/mol.

Thus, the composition can additionally comprise at least one plasticizing agent. In particular, mention may be made, alone or as a mixture, of the usual plasticizers, such as:

- glycols and their derivatives, such as diethylene glycol ethyl ether, diethylene glycol methyl ether, diethylene glycol butyl ether or diethylene glycol hexyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether or ethylene glycol hexyl ether,

- polyethylene glycols, polypropylene glycols, polyethylene glycol/polypropylene glycol copolymers and their mixtures, in particular polypropylene glycols of high molecular weight, for example having a molecular weight ranging from 500 to 15 000, such as, for example,

- glycol esters,

- propylene glycol derivatives and in particular propylene glycol phenyl ether, propylene glycol diacetate, dipropylene glycol ethyl ether, tripropylene glycol methyl ether, diethylene glycol methyl ether or dipropylene glycol butyl ether. Such compounds are sold by Dow Chemical under the names Dowanol PPH and Dowanol DPnB,

- acid esters, in particular carboxylic acid esters, such as citrates, phthalates, adipates, carbonates, tartrates, phosphates or sebacates,

- esters resulting from the reaction of a monocarboxylic acid of formula

R11COOH with a diol of formula HOR12OH with R-n and R12, which are identical or different, representing a saturated or unsaturated and linear, branched or cyclic hydrocarbon chain preferably comprising from 3 to 15 carbon atoms and optionally comprising one or more heteroatoms, such as N, O or S, in particular the monoester resulting from the reaction of isobutyric acid and octanediol, such as 2,2,4-trimethyl- 1 ,3-pentanediol, such as that sold under the reference Texanol Ester Alcohol by Eastman Chemical,

- oxyethylenated derivatives, such as oxyethylenated oils, in particular vegetable oils, such as castor oil,

- their mixtures.

More particularly, the plasticizser can be chosen from esters of at least one carboxylic acid comprising from 1 to 7 carbon atoms and of a polyol comprising at least 4 hydroxyl groups.

The polyol according to the invention can be a cyclized or non-cyclized monosaccharide - polyhydroxyaldehyde (aldose) or polyhydroxyketone (ketose). The polyol is preferably a cyclized monosaccharide in the hemiacetal form.

The polyol can be a mono- or polysaccharide comprising from 1 to 10 monosaccharide units, preferably from 1 to 4 monosaccharide units and more preferably one or two monosaccharide units. The polyol can be chosen from erythritol, xylitol, sorbitol, glucose, sucrose, lactose or maltose.

The polyol according to the invention is preferably a disaccharide. Mention may be made, among disaccharides, of sucrose (also known as a-D-glucopyranosyl-(1 -2)-3- D-fructofuranose), lactose (also known as 3-D-galactopyranosyl-(1 -4)-3-D- glucopyranose) and maltose (also known as a-D-glucopyranosyl-(1 -4)-3-D- glucopyranose), and preferably of sucrose.

The ester according to the invention can be composed of a polyol esterified by at least two different monocarboxylic acids or by at least three different monocarboxylic acids.

The ester according to the invention can be a copolymer of two esters, in particular a copolymer i) of a sucrose substituted by benzoyl groups and ii) of a sucrose substituted by acetyl and/or isobutyryl groups.

The carboxylic acid is preferably a monocarboxylic acid comprising from 1 to 7 carbon atoms and preferably from 1 to 5 carbon atoms, for example chosen from acetic acid, n-propanoic acid, isopropanoic acid, n-butanoic acid, isobutanoic acid, tert- butanoic acid, n-pentanoic acid and benzoic acid. The ester can be obtained from at least two different monocarboxylic acids. According to one embodiment, the acid is a linear or branched acid which is unsubstituted.

The acid is preferably chosen from acetic acid, isobutyric acid, benzoic acid and their mixtures.

According to a preferred embodiment, the ester is sucrose diacetate hexa(2- methylpropanoate), such as that sold under the name Sustane SAIB Food Grade Kosher by Eastman Chemical.

According to another embodiment, the plasticizer can be chosen from esters of an aliphatic or aromatic polycarboxylic acid and of an aliphatic or aromatic alcohol comprising from 1 to 10 carbon atoms.

The aliphatic or aromatic alcohol comprises from 1 to 10 carbon atoms, preferably from 1 to 8 carbon atoms, for example from 1 to 6 carbon atoms. It can be chosen from R10H alcohols, such that R1 represents methyl, ethyl, propyl, isopropyl, butyl, hexyl, ethylhexyl, decyl, isodecyl, benzyl or benzyl substituted by an alkyl comprising from 1 to 3 carbon atoms, and their mixtures.

The aliphatic or aromatic polycarboxylic acid preferably comprises from 3 to 12 carbon atoms, preferably from 3 to 10 carbon atoms, preferably from 3 to 8 carbon atoms, for example 6 or 8 carbon atoms.

The aliphatic or aromatic polycarboxylic acid is advantageously chosen from dicarboxylic acids and tricarboxylic acids.

Mention may be made, among aliphatic dicarboxylic acids, of those of formula HOOC-(CH₂)_n-COOH, in which n is an integer ranging from 1 to 10, preferably ranging from 2 to 8, for example equal to 2, 4, 6 or 8.

Preference is given to dicarboxylic acids chosen from succinic acid, adipic acid and sebacic acid.

Mention may be made, among aromatic dicarboxylic acids, of phthalic acid.

Mention may be made, among tricarboxylic acids, of triacids which correspond to the formula

in which R represents an -H, -OH or -OCOR' group in which R' represents an alkyl group having from 1 to 6 carbon atoms. Preferably, R represents an -OCOCH₃ group.

The tricarboxylic acid is chosen in particular from acetylcitric acid, butyroylcitric acid or citric acid.

Use may be made, among tricarboxylic acid esters, of esters derived from citric acid (or citrates), such as tributyl acetylcitrate, triethyl acetylcitrate, triethylhexyl acetylcitrate, trihexyl acetylcitrate, trihexyl butyroylcitrate, triisodecyl citrate, triisopropyl citrate, tributyl citrate and tri (2-ethy I h exy I ) citrate. Mention may be made, as commercial references for plasticizers mentioned above, of the Citroflex range sold by Vertellus, with in particular Citroflex A4 and Citroflex C2.

Mention may be made, among adipic acid esters, of dibutyl adipate and di(2- ethylhexyl) adipate.

Mention may be made, among sebacic acid esters, of dibutyl sebacate, di(2- ethylhexyl) sebacate, diethyl sebacate and diisopropyl sebacate.

Mention may be made, among succinic acid esters, of di(2-ethylhexyl) succinate and diethyl succinate.

Mention may be made, among phthalic acid esters, of benzyl butyl phthalate, dibutyl phthalate, diethylhexyl phthalate, diethyl phthalate and dimethyl phthalate.

Advantageously, the plasticizer or plasticizers can be present in the composition in a content such that the ratio by weight of the hybrid hydrophobic film-forming acrylic polymer or polymers to the plasticizer or plasticizers varies from 0.5 to 100, preferably from 1 to 50 and preferably from 1 to 10. Thickening agent

The composition of use in the device or the method of the invention can comprise a thickening agent. This thickening agent can be chosen from inorganic or organic and polymeric or non-polymeric thickening agents, and their mixtures.

The term "thickener" is understood to mean a compound which modifies the rheology of the medium into which it is incorporated.

According to a specific embodiment of the invention, the composition comprises at least one inorganic thickener.

Preferably, the thickener or thickeners is/are chosen from fumed silica, clays or their mixtures. The fumed silicas can be obtained by high-temperature pyrolysis of a volatile silicon compound in an oxhydric flame, producing a finely divided silica. This process makes it possible in particular to obtain hydrophilic silicas which exhibit a large number of silanol groups at their surface. Such hydrophilic silicas are sold, for example, under the names Aerosil 130®, Aerosil 200®, Aerosil 255®, Aerosil 300® and Aerosil 380® by Degussa and Cab-O-Sil HS-5®, Cab-O-Sil EH-5®, Cab-O-Sil LM-130®, Cab-O-Sil MS-55® and Cab-O-Sil M-5® by Cabot.

It is possible to chemically modify the surface of the said silica via a chemical reaction which brings about a reduction in the number of silanol groups. It is possible in particular to replace silanol groups with hydrophobic groups: a hydrophobic silica is then obtained.

The hydrophobic groups can be:

- trimethylsiloxyl groups, which are obtained in particular by treating fumed silica in the presence of hexamethyldisilazane. Silicas thus treated are known as "Silica silylate" according to the CTFA (6^th edition, 1995). They are sold, for example, under the references Aerosil R812® by Degussa and Cab-O-Sil TS-530® by Cabot.

- dimethylsilyloxyl or polydimethylsiloxane groups, which are obtained in particular by treating fumed silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. Silicas thus treated are known as "Silica dimethyl silylate" according to the CTFA (6^th edition, 1995). They are sold, for example, under the references Aerosil R972® and Aerosil R974® by Degussa and Cab-O-Sil TS-610® and Cab-O-Sil TS-720® by Cabot.

The fumed silica preferably exhibits a particle size which can be nanometric to micrometric, for example ranging from approximately 5 to 200 nm.

Clays are well known products which are described, for example, in the publication Mineralogie des argiles [Mineralogy of Clays], S. Caillere, S. Henin and M. Rautureau, 2nd Edition, 1982, Masson.

Clays are silicates including a cation which can be chosen from calcium, magnesium, aluminium, sodium, potassium or lithium cations, and their mixtures.

Mention may be made, as examples of such products, of clays of the family of the smectites, such as montmorillonites, hectorites, bentonites, beidellites or saponites, and also of the family of the vermiculites, stevensite or chlorites.

These clays can be of natural or synthetic origin. Use is preferably made of clays which are cosmetically compatible and acceptable with keratinous substances. Mention may be made, as clay which can be used according to the invention, of synthetic hectorites (also known as laponites), such as the products sold by Laporte under the name Laponite XLG, Laponite RD and Laponite RDS (these products are sodium magnesium silicates and in particular lithium magnesium sodium silicates); bentonites, such as the product sold under the name Bentone HC by Rheox; magnesium aluminium silicates, in particular hydrated, such as the product sold by R.T. Vanderbilt Company under the name Veegum Ultra, or calcium silicates and in particular that in synthetic form sold by the company CELITE ET WALSH ASS under the name Micro-Cel C.

The organophilic clay can be chosen from montmorillonite, bentonite, hectorite, attapulgite or sepiolite, and their mixtures. The clay is preferably a bentonite or a hectorite.

These clays can be modified with a chemical compound chosen from quaternary ammoniums, tertiary amines, amine acetates, imidazolines, amine soaps, fatty sulfates, alkylarylsulfonates, amine oxides and their mixtures.

Mention may be made, as organophilic clays, of quaternium-18 bentonites, such as those sold under the names Bentone 3, Bentone 38 and Bentone 38V by Rheox, Tixogel VP by United Catalyst and Claytone 34, Claytone 40 and Claytone XL by Southern Clay; stearalkonium bentonites, such as those sold under the names Bentone 27 by Rheox, Tixogel LG by United Catalyst and Claytone AF and Claytone APA by Southern Clay; and quaternium-18/benzalkonium bentonites, such as those sold under the names Claytone HT and Claytone PS by Southern Clay.

The thickener can also be chosen from organic compounds.

Mention may be made, for example, of the following polymeric or non-polymeric products:

- C10-C30 fatty amides, such as lauric acid diethanolamide,

- the polyglyceryl (meth)acrylate polymers sold under the Hispagel or Lubragel names by Hispano Quimica or Guardian,

- polyvinylpyrrolidone,

- polyvinyl alcohol,

- crosslinked acrylamide polymers and copolymers, such as those sold under the names PAS 5161 or Bozepol C by Hoechst or Sepigel 305 by SEPPIC or alternatively the crosslinked methaci^loyloxyethyltrimethylammonium chloride homopolymers sold under the name Salcare SC95 by Allied Colloid,

- associative polymers and in particular associative polyurethanes.

Such thickeners are described in particular in Application EP-A-1 400 234.

Mention may also be made of the following thickeners, in particular if the compositions comprise oily compounds:

- organophilic clays;

- hydrophobic fumed silicas.

More specifically, organophilic clays are clays modified by chemical compounds which make the clay capable of swelling.

Preferably, the composition comprises at least one inorganic thickening agent which is preferably chosen from clays and more advantageously still from smectites, preferably bentonites.

According to a preferred embodiment, the composition of use in the invention comprises at least one thickening agent. This or these thickening agent(s) can then be present in a total content ranging from 0.1 % to 10% by weight, with respect to the weight of the composition.

The composition according to the invention comprises water, which can preferably be present in a content ranging from 20% to 98% by weight, with respect to the weight of the composition.

According to a specific embodiment, the composition of use in the device or the method of the invention comprises an odorous compound or a mixture of odorous compounds, such as a fragrance. Mention may be made, as odorous compounds and fragrances, of those described in the article "Perfumes" by William L. Schreiber, pp 171 -201 , volume 18, of the fourth edition of The Encyclopedia of Chemical

Technology, Kirk-Othmer, 1996.

The compositions can also comprise at least one agent commonly used in cosmetics, for example chosen from reducing agents, fatty substances, organic solvents or oils, softening agents, anti-foaming agents, moisturizing agents, UV screening agents, peptizing agents, solubilizing agents, fragrances, anionic, cationic, non-ionic or amphoteric surfactants, proteins, vitamins, propellants, oxyethylenated or non-oxyethylenated waxes, paraffins or Ci₀-C₃o fatty acids, such as stearic acid or lauric acid. The above additives are generally present in an amount for each of them of between 0.01 % and 20% by weight, with respect to the weight of the composition.

Of course, a person skilled in the art will take care to choose this or these optional additive(s) so that the advantageous properties intrinsically attached to the formation of the coating in accordance with the invention are not, or not substantially, detrimentally affected.

The composition according to the invention can be provided in particular in the form of a suspension, a dispersion, a gel, an emulsion, in particular an oil-in-water (O/W), water-in-oil (W/O) or multiple (W/O/W or polyol/O/W or 0/W/O) emulsion, a cream, a foam, a stick, a dispersion of vesicles, in particular of ionic or non-ionic lipids, a two-phase or multiphase lotion, a spray or a paste. The composition can also be provided in the form of a lacquer.

A person skilled in the art can choose the appropriate formulation form, and also its method of preparation, on the basis of his general knowledge, taking into account first the nature of the constituents used, in particular their solubility in the support, and secondly the application envisaged for the composition.

The composition described above can be employed on dry or wet keratinous fibres and also on any type of fibre, light or dark, natural or dyed, or permanent-waved, bleached or straightened.

According to a specific embodiment of the method of the invention, the fibres are washed before application of the composition described above.

After the application of the composition, the fibres can be left to dry or dried, for example at a temperature greater than or equal to 30°C. The drying, if it is employed, can be carried out immediately after the application or after a leave-in time which can range from 1 minute to 30 minutes.

Preferably, if the fibres are dried, they are dried, in addition to a supply of heat, with a flow of air. This flow of air during the drying makes it possible to improve the individualization of the coating.

During the drying, a mechanical action can be exerted on the locks, such as combing, brushing or running the fingers through the hair. This operation can likewise be carried out once the fibres have dried, naturally or unnaturally.

The drying stage of the method of the invention can be carried out with a hood dryer, a hair dryer, a smoothing iron, a Climazone, and the like. When the drying stage is carried out with a hood dryer or a hair dryer, the drying temperature is between 40°C and 1 10°C and preferably between 50°C and 90°C.

The application of the composition can be followed by a stage of shaping the fibres by means of the fingers or using a device, such as a comb, a brush, a smoothing iron or a curling iron. After such a treatment of the fibres, the shaping is persistent towards shampooing operations.

When the drying stage is carried out with a smoothing or curling iron, the drying temperature is between 1 10°C and 220°C and preferably between 140°C and 200°C. The invention will be illustrated more fully with the aid of the non-limiting examples that follow. Unless otherwise mentioned, the amounts indicated are expressed in grams.

EXAMPLES Composition examples:

The formulation having composition A is deposited on a lock of hair weighing 1 g using the applicator described above. After a few seconds at ambient temperature, the lock of hair is dry and scented. The hair is individualized with the fingers or using a brush and/or a comb. The feel of the hair is soft and natural, and thicker to the touch (contribution of mass). The contribution of mass to the head of hair remains present after at least a first shampooing. The hair remains scented at least up to the first shampooing.

Composition B

Styrene/acrylates copolymer in aqueous dispersion, sold by BASF 21 .2 g, under the name Joncryl 77. i.e. 10%

as AM

Divinyldimethicone/dimethicone copolymer in aqueous emulsion, 8.3 g, i.e.

sold by Dow Corning under the reference HMW 2220 Non-Ionic 5% as AM Emulsion

Clay (Magnesium Aluminium Silicate), sold by Vanderbilt under the 2 g

name Veegum granules

"Tresor" fragrance from Lancome 0.5 g

Water q.s. 100 g

The formulation having composition B is deposited on a lock of fine hair using the applicator described above. After a few seconds, the hair is dry with a contribution of mass. The hair is individualized with the fingers or using a brush and/or a comb. The feel of the hair is soft and natural, and thicker to the touch. The contribution of mass to the head of hair remains present after at least a first shampooing. The hair remains scented at least up to the first shampooing.

The clay makes it possible to retain the fragrance for longer.

The formulation having composition C is deposited on a lock of hair weighing 1 g using the applicator described above. After a few seconds, the lock of hair is dry and scented. The hair is individualized with the fingers or using a brush and/or a comb. The feel of the hair is soft and natural, and thicker to the touch. The contribution of mass to the head of hair remains present after at least a first shampooing. The hair remains scented at least up to the first shampooing.

Claims

1 . Device (1 ) for the application of a non-colouring composition for the treatment of keratinous fibres, comprising:

(i) an application means (2) which is capable of retaining an amount of the treatment composition (P) in a container (20),

(ii) a holding member (4) which is capable of interacting with the application means (2) in order, during a longitudinal displacement of the device (1 ) relative to a lock of keratinous fibres, to keep the said lock engaged with the application means (2), so as to make possible the coating thereof with the treatment composition (P),

(iii) the said application means (2) comprising an applicator end piece (30) mounted on the container (20) and comprising an outlet orifice (31 ) equipped with an opening/closing element (32) which, in a first position, closes off the said outlet orifice and which, in a second position, at least partly releases the said outlet orifice, the change from the first position to the second position taking place in response to a force exerted on the opening/closing element (32) by the engaging of the said lock between the holding member and this opening/closing element (32),

(iv) the said non-colouring treatment composition (P) comprising at least an aqueous dispersion of particles of hybrid film-forming acrylic polymer and at least one linear block silicone copolymer.

2. Device according to the preceding claim, characterized in that the holding member (4) can move with respect to the application means (2).

3. Device according to either one of the preceding claims, characterized in that the holding member (4) and the application means (2) form two separate pieces or else are connected by a connecting means (50) and form a single piece.

4. Device according to any one of the preceding claims, characterized in that the applicator end piece (30) comprises a surface (37) capable of storing and releasing the treatment composition (P).

5. Device according to any one of the preceding claims, in which the treatment composition (P) comprises at least one linear block silicone copolymer provided in the form of particles in dispersion in an aqueous medium.

6. Device according to any one of the preceding claims, in which the treatment composition (P) comprises at least one linear block silicone copolymer obtained by a chain extension reaction in the presence of a catalyst, starting from at least:

(a) one polysiloxane (i) having at least one reactive group and preferably one or two reactive groups per molecule; and (b) one organosilicone compound (ii) which reacts with the polysiloxane (i) by a chain extension reaction.

7. Device according to the preceding claim, characterized in that the organ mpounds of formula (I):

in which R-i and R₂ represent, independently of one another, a hydrocarbon group having from 1 to 20 carbon atoms or an aryl group or a reactive group, and n is an integer greater than 1 , provided that there are on average between one and two reactive groups per polymer.

8. Device according to the preceding claim, characterized in that the reactive group is chosen from hydrogen; aliphatically unsaturated groups; the hydroxyl group; alkoxy groups; alkoxyalkoxy groups; the acetoxy group; amino groups; and their mixtures.

9. Device according to either one of Claims 7 and 8, characterized in that R-i represents a methyl group and R₂ at the chain end represents a vinyl group.

10. Device according to any one of Claims 6 to 8, characterized in that the organosilicone compound (ii) is chosen from polysiloxanes of formula (I) or compounds acting as chain-extending agent such as a silane, a siloxane or a silazane..

1 1 . Device according to the any one of Claims 6 to 8, characterized in that the ula (II):

where n is an integer greater than 1 and preferably greater than 10, preferably equal to 20.

12. Device according to any one of Claims 5 to 8, characterized in that the dispersion is an aqueous dispersion of divinyldimethicone/dimethicone copolymer.

13. Device according to one of the preceding claims, in which the treatment composition (P) exhibits a content of linear block silicone copolymer(s), expressed as active materials of polymers, ranging from 0.1 % to 30% by weight, more particularly from 0.5% to 20% by weight and preferably from 1 % to 15% by weight, with respect to the total weight of the composition.

14. Device according to any one of the preceding claims, in which the treatment composition (P) comprises at least one hybrid film-forming acrylic polymer synthesized from at least one monomer having at least one (meth)acrylic acid group and/or esters of these acid monomers and/or amides of these acid monomers and from at least one styrene compound; preferably, at least one hybrid film-forming acrylic polymer is chosen from styrene/acrylate copolymers, in particular a copolymer resulting from the polymerization of at least one styrene monomer and of at least one C-I-C-IO alkyl acrylate monomer.

15. Device according to any one of the preceding claims, in which the hybrid hydrophobic film-forming acrylic polymer or polymers in aqueous dispersion is or are present in a content, as active materials, ranging from 0.1 % to 30% by weight, more particularly from 0.5% to 20% by weight and preferably from 1 % to 15% by weight, with respect to the total weight of the composition.

16. Device according to any one of the preceding claims, in which the hybrid hydrophobic film-forming acrylic polymer or polymers in aqueous dispersion and the linear block silicone copolymer or copolymers are present in a hybrid hydrophobic film- forming acrylic polymer(s) to linear block silicone copolymer(s) ratio by weight ranging from 0.2 to 10, advantageously from 0.5 to 5 and preferably from 1 to 3.

17. Device according to any one of the preceding claims, in which the treatment composition (P) comprises an odorous compound or a mixture of odorous compounds, such as a fragrance.

18. Device according to any one of the preceding claims, in which the treatment composition (P) comprises at least one inorganic thickening agent preferably chosen from clays, preferably a smectite.

19. Method for the treatment of keratinous fibres comprising the application, to the keratinous fibres, of a non-colouring treatment composition (P) included in a device according to any one of the preceding claims, optionally followed by a drying of the fibres.