WO2008075301A2

WO2008075301A2 - Cosmetic product comprising silicone compounds and reflective particles with metallic reflection

Info

Publication number: WO2008075301A2
Application number: PCT/IB2007/055233
Authority: WO
Inventors: Ludovic Thevenet
Original assignee: L'oreal
Priority date: 2006-12-20
Filing date: 2007-12-19
Publication date: 2008-06-26
Also published as: WO2008075301A3

Abstract

The present invention relates to a cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, with at least one of compounds X and Y being a silicone compound, at least one catalyst, said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, when they are brought into contact with one another, and in which the compounds X, Y and the catalyst are not present simultaneously in the same composition.

Description

Cosmetic product comprising silicone compounds and reflective particles with metallic reflection

The subject of the present invention is a cosmetic kit for make-up and/or care of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least one compound X, at least one compound Y and at least some reflective particles with metallic reflection, and additionally, where appropriate, at least one catalyst or peroxide.

The cosmetic kits according to the invention can be kits for make-up or care of keratinous substance(s), such as, for example, the skin, the lips, the eyelashes, the eyebrows or the nails.

They may especially be kits for make-up of the skin and/or of the lips, such as, for example, foundations, face powders or eye shadows, concealer kits, blushers, lipsticks, lip balms, lip glosses, lip pencils or else kits for making up the body or colouring the skin.

The cosmetic compositions, and in particular the make-up compositions, are generally used to modify the visual appearance properties of the area where they are applied, such as, for the example, the colour, gloss and/or transparency. Gloss effects are thus very often associated with cosmetic compositions intended to enhance certain areas of application, such as, for example, the skin, lips, nails or else eyelids.

Several technological systems have already been used to obtain such gloss effects, and may in particular vary according to the particular effect desired. Thus, to obtain a continuous gloss (described as "wet look") or else to obtain highlight points (that is to say a gloss associated with the particles), it is known to use technological systems that rely on small reflective particles with metallic reflection properties.

So that the desired effect is significant and sufficient, the reflective particles with metallic reflection used must however be present in a sufficient amount.

Furthermore, it is also necessary that the spatial distribution of these particles on the application support remain as homogenous as possible, so that the highlight points remain uniformly distributed.

The reflective particles with metallic reflection are however generally transported in the oily phase of the cosmetic compositions, which has the particularity of usually being tacky. However, this tacky nature has the effect of resulting in cosmetic compositions that are likely to leave traces on supports with which they come into contact, such as for example glasses or coffee cups, thus reducing the number of reflective particles with metallic reflection deposited on the application support, and consequently the number of highlight points, and moreover disturbing their spatial distribution.

However, the latter aspect is particularly damaging in terms of aesthetic effect insofar as such an action on the spatial distribution of the reflective particles leads to the appearance of zones denuded of highlight points and zones where these are overly concentrated.

There is therefore a need for novel systems that enable the number of reflective particles with metallic reflection to be maintained over time and thus to keep the intensity of the gloss effect obtained constant over time.

There is also a need for novel systems that are useful for keeping the concentration and the spatial distribution of the reflective particles with metallic reflection homogenous on the application support and over time.

Finally there is a need to provide novel cosmetic compositions comprising reflective particles with metallic reflection and having improved properties of non-transfer and hold.

The term "hold" is understood to mean, in the sense of the invention, the hold of the gloss effect obtained or else the retention of the concentration and spatial distribution of said particles on the application support, for example of keratinous substance type.

The present invention specifically aims to provide a novel mode of formulating cosmetic compositions comprising reflective particles with metallic reflection and making it possible to obtain a film deposited on the keratinous substances endowed with a significant reflective effect with metallic reflection together with good cosmetic properties, especially in terms of non-transfer and hold, and forming a comfortable deposit on the skin.

Recently, the inventors have in fact observed that it was possible to obtain such properties by taking advantage of the ability of certain compounds, especially silicones, to interact when they are brought together and to form, at the end of their interaction, a polymer film.

Thus, compounds known as compound X and compound Y, such as defined hereinbelow, prove capable of polymerizing in situ, at atmospheric pressure and ambient temperature, and of forming films that are advantageously biocompatible, non-tacky, slightly opalescent, or even peelable. Such systems are, in particular, partly described in documents WO 01/96450 and GB 2 407 496 by Dow Corning.

These polymer films, capable of being formed in situ on a support, especially of keratinous substance type, prove to be endowed with advantageous properties in terms of cosmetics, namely good adhesion, good hold and comfort.

Unexpectedly, the inventors have discovered that it was possible to obtain, with such formulations, compositions comprising reflective particles with metallic reflection, and having improved non-transfer and hold properties. Thus, according to a first of its aspects, the present invention relates to a cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, with at least one of compounds X and Y being a silicone compound, and optionally at least one catalyst or a peroxide, said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, or by a condensation reaction, or by a crosslinking reaction in the presence of a peroxide, when they are brought into contact with one another, and in which compounds X, Y and the catalyst or the peroxide, when they are present, are not present simultaneously in the same composition.

The compound or compounds X, the compound or compounds Y, and if necessary the catalyst or peroxide, may be applied to the keratinous substances from several compositions containing the reflective particles with metallic reflection, the compound or compounds X, the compound or compounds Y, and if necessary the catalyst or peroxide, on their own or mixed, or from a single composition containing the compound or compounds X, the compound or compounds Y, the reflective particles with metallic reflection, and if necessary the catalyt or peroxide.

According to a particular embodiment of the invention, the kit comprises at least: i. a first composition comprising, in a physiologically acceptable medium, at least one compound X and ii. a second composition comprising, in a physiologically acceptable medium, at least one compound Y, with at least one of said first and second compositions additionally comprising at least some reflective particles with metallic reflection, and at least one of said first and second compositions containing, in addition, where appropriate, at least one catalyst or a peroxide.

The first and second compositions are different from one another. For example, the first composition is advantageously free of compound Y and the second composition is advantageously free of compound X. This is because, with regard to their high reactivity for one another, the compounds X and Y are not present simultaneously in a first and/or second composition forming a kit according to the invention when their interaction is not conditioned by the presence of a catalyst or a peroxide.

On the other hand, at the moment of application or just before, the compounds X and Y may be mixed and present in one and the same composition, if necessary in the presence of a catalyst or peroxide, resulting from the mixing of the first and second compositions forming the kit according to the invention.

Preferably, the compositions of the kit, and in particular the first composition comprising the compound X and the second composition comprising the compound Y of the kit are packaged in separate packaging. For example, each composition can be packaged separately in the same packaging article, for example in a two-compartment pen, the base composition being delivered by one end of the pen and the top composition being delivered by the other end of the pen, each end being closed notably hermetically with a cap. Each composition can also be packaged in a compartment within the same packaging article, the two compositions being mixed at the end or ends of the packaging article during delivery of each composition.

Alternatively, each of the first and second compositions can be packaged in a different packaging article.

The present invention also relates to a cosmetic composition especially for care and/or make-up of keratinous substance(s) containing, in a physiologically acceptable medium, at least one compound X, one compound Y, if necessary at least one catalyst or peroxide, and reflective particles with metallic reflection such as defined above, with at least one of the compounds X and Y being in an encapsulated form.

According to one preferred embodiment variant, the two compounds X and Y are present in separate encapsulated forms.

According to this embodiment, the two compounds X and Y may be packaged in one and the same composition while being free from the risk of premature reaction between them. This reaction only takes place at the moment when the composition is first handled or at the moment of its application to the keratinous substance. The encapsulated form or forms break open on drying and the compounds X and Y can react, if necessary in the presence of a catalyst or peroxide, to form the expected film. Advantageously, the spatial arrangement, and especially the spatial distribution and concentration of the reflective particles with metallic reflection, remains homogenous over time on the supports where the cosmetic compositions according to the invention are applied.

Furthermore, the very high translucency of the compositions obtained according to the invention makes it possible to obtain highlight points having an improved intensity.

The invention also relates, according to another of its aspects, to a cosmetic method for make-up and/or care of keratinous substance(s) comprising at least the application (a) of at least some reflective particles with metallic reflection, (b) of one or more compounds X, (c) of one or more compounds Y, with at least one of compounds X and Y being a silicone compound and said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, or by a condensation reaction, or by a crosslinking reaction in the presence of a peroxide, when they are brought into contact with one another, and (d) if necessary at least one catalyst or a peroxide, and applications (a), (b), (c) and (d) can be simultaneous or consecutive in any order provided that it promotes the interaction of said compounds X and Y.

According to a particular embodiment of the invention, a first composition comprising at least the compound or compounds X, and a second composition comprising at least the compound or compounds Y, are applied on the keratinous substances, with at least one of said first and second compositions comprising in addition reflective particles with metallic reflection, and at least one of said first and second compositions comprising, additionally, where appropriate, at least one catalyst or a peroxide. Thus, according to another of its aspects, the present invention relates to a cosmetic method for make-up and/or care of keratinous substance(s), comprising at least the application on said keratinous substances of at least: one layer of a first composition comprising, in a physiologically acceptable medium, one or more compounds X; and one layer of a second composition comprising, in a physiologically acceptable medium, one or more compounds Y, with at least one of compounds X and Y being a silicone compound and said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, or by a condensation reaction, or by a crosslinking reaction in the presence of a peroxide, when they are brought into contact with one another, and if necessary at least one of the first and second compositions additionally comprising at least one catalyst or a peroxide, and at least one of the first and second compositions additionally comprising at least some reflective particles with metallic reflection. More particularly, said method may consist in applying, on said keratinous substances, at least one composition comprising, in a physiologically acceptable medium, at least some reflective particles with metallic reflection, at least one compound X and at least one compound Y, and, where, appropriate, at least one catalyst or a peroxide.

According to a variant, the method comprises applying, on said keratinous substances, at least one layer of the second composition that includes compound Y and if necessary reflective particles with metallic reflection, then depositing on the layer or layers of said second composition, at least one layer of the first composition that includes compound X and if necessary reflective particles with metallic reflection, at least one of said first and second compositions additionally including, if necessary, at least one catalyst or peroxide.

Several layers of each of the first and second compositions can also be applied alternately on keratinous substances.

The composition applied can also be obtained by mixing, in an extemporaneous way, a first composition comprising at least compound X and a second composition comprising at least compound Y, at least one of the first and second compositions comprising in addition reflective particles with metallic reflection, and at least one of the first and second compositions comprising, additionally, where appropriate, at least one catalyst or a peroxide.

In the sense of the invention, notably in the embodiment where the composition is obtained as described above, namely by mixing, in an extemporaneous way, a first composition containing at least compound X and a second composition containing at least compound Y, it is to be understood that the mixture thus formed comprises compounds X and/or Y in a form that has not yet reacted and not exclusively in the form of their reaction product by hydrosilylation in the presence of a catalyst, by condensation and/or by crosslmking in the presence of a peroxide.

Thus, formation of the reaction product according to the invention can either be carried out directly on the surface of the keratinous substance that is to be treated, or initiated just before application by extemporaneous mixing of compounds X and Y in conditions favourable for their interaction, formation of the reaction product being in the latter case finalized on the surface of the keratinous substance.

For obvious reasons, and in view of the great reactivity of compounds X and/or Y, it is in fact necessary that their application should be carried out in conditions that are favourable for the manageability of the composition containing it (or them) notably with respect to its spreading, for example. The method according to the invention therefore employs a composition containing compounds X and Y, and therefore not congealed in the form of the expected final film resulting from reaction of all of X and/or of all of Y. According to a particular embodiment, the composition applied contains at least one of compounds X and Y in an encapsulated form.

According to yet another embodiment, the method according to the invention includes a supplementary step comprising depositing at least one layer of a third composition comprising a physiologically acceptable medium and at least one fϊlm- forming polymer and at least one organic (or oily) or aqueous solvent medium on the layer or layers of the composition or compositions comprising the compounds X,Y,the reflective particles with metallic reflection, and, where appropriate, at least one catalyst or a peroxide, in order, for example, to improve the hold and/or comfort of this or these layers.

REFLECTIVE PARTICLES WITH METALLIC REFLECTION

The composition or at least one of the first and second compositions comprise reflective particles with metallic reflection. According to one embodiment of the invention, the reflective particles with metallic reflection may be present in only one of the first and second compositions.

The expression "reflective particles with metallic reflection" is understood in the sense of the present invention to mean particles whose size, structure, especially the thickness of the layer or layers which form it and their physical and chemical natures, and the surface finish, enable them to reflect incident light. This reflection may, where appropriate, have a sufficient intensity to create, at the surface of the composition or the mixture, when this is applied to the support to be made up, highlight points that are visible to the naked eye, that is to say more luminous points that contrast with their surroundings by appearing to shine.

The reflective particles may be chosen so as to not significantly impair the colouring effect generated by the colouring agents which may be associated with them and more particularly so as to optimize this effect in terms of colour rendering. They may more particularly have a yellow, pink, red, bronze, orange, brown and/or coppery colour or reflection.

These particles may be of any shape, for example they may be in the form of platelets or globules, especially spherical globules, that may or may not be elongated, where appropriate with a high aspect ratio.

They may have, for example, at least one electrically conductive layer at the surface, formed from at least one metal, optionally doped.

As a variant, the reflective particles with metallic reflection may have, at the surface, at least one protective layer that is sufficiently transparent for the particle to retain the desired metallic reflection effect.

The reflective particles with metallic reflection, regardless of their shape, may or may not have a multilayer structure and, in the case of a multilayer structure may have, for example, at least one layer of uniform thickness, especially of a reflective material, such as for example an optionally doped metal or alloy.

When the reflective particles with metallic reflection do not have a multilayer structure, they may be composed, for example, of at least one optionally doped metal or metal alloy.

When the reflective particles with metallic reflection have a multilayer structure, these may for example have a natural or synthetic substrate, especially a synthetic substrate, at least partially coated by at least one layer of a reflective material, especially of at least one metal, metal alloy or metallic material. This layer may be, for example, an outer layer of the structure.

According to a particular embodiment, reflective particles with metallic reflection contained in a kit in accordance with the present invention, may have a multilayer structure and comprise a natural or synthetic substrate that is at least partially coated by at least one layer of a reflective material.

The reflective material may especially be a metal oxide, chosen, for example, from titanium oxides, especially TiO₂, iron oxides, especially Fe₂O₃, tin and chromium oxides, barium sulphate and the following materials: MgF₂, CrF₃, ZnS, ZnSe, SiO₂, AI₂O3,

MgO, Y₂O₃, SeO₃, SiO, HfO₂, ZrO₂, CeO₂, Nb₂O₅, Ta₂O₅, MoS₂ and mixtures or alloys thereof.

The substrate may consist of one material or several materials, and may be organic and/or inorganic. More particularly, it may be chosen from glass, ceramics, graphite, metal oxides, aluminas, silicas, silicates, especially aluminosilicates and borosilicates, synthetic mica and mixtures thereof, this list not being limiting.

By way of example of such particles, mention may be made, for example, of particles having a synthetic mica substrate coated with titanium dioxide, or glass particles coated either with brown iron oxide, titanium oxide, tin oxide or one of their mixtures such as those sold under the brand REFLECKS® by Engelhard.

Reflective particles are described, in particular, in documents JP-A-09188830, JP-A-10158450, JP-A-10158541, JP-A-07258460 and JP-A-05017710.

Still by way of example of reflective particles with metallic reflection having a mineral substrate coated with a layer of metal, mention may also be made of particles having a borosilicate substrate coated with silver, also known as "white nacres".

Silver-coated glass substrate particles, in the form of platelets, are sold under the name MICROGLASS METASHINE REFSX 2025 PS by Toyal. Glass substrate particles coated with a nickel/chromium/molybdenum alloy are sold under the name CRYSTAL STAR GF 550, GF 2525 by this same company. As an example of reflective particles with metallic reflection that have an optionally coated metal compound at the surface, mention may be made of the particles provided under the names METASHINE® LE 2040 PS, METASHINE® 5 MC5090 PS or METASHINE® MC280GP (2523) by Nippon Sheet Glass, SPHERICAL SILVER POWDER® DC 1000, SILVER FLAKE® JV 6 or GOLD POWDER® Al 570 by Engelhard, STARLIGHT REFLECTIONS FXM® by Energy Strategy Associates Inc, BRIGHT SILVER® 1 E 0.008X0.008 by Meadowbrook Inventions, ULTRAMIN® (ALUMINIUM POUDRE FINE LIVING) and COSMETIC METALLIC POWDER VISIONAIRE BRIGHT SILVER SEA®, COSMETIC METALLIC POWDER VISIONAIRE NATURAL GOLD® (60314) or COSMETIC METALLIC POWDER VISIONAIRE HONEY® 560316° by Eckart.

The reflective particles with metallic reflection may reflect the visible spectrum substantially uniformly, as is the case, for example, for particles that may or may not be coated with a metal such as silver or aluminium, which may then result, for example, in a metallic reflection having a non-neutral, yellow, pink, red, bronze, orange, brown and/or coppery tone, depending on the nature, for example, of the surface metal compound. According to a particular embodiment, the reflective particles with metallic reflection contained in a kit according to the invention, may be present in an amount ranging from 0.1 to 60% by weight, in particular from 1 to 30% by weight, and for example from 3 to 10% by weight relative to the total weight of the composition containing them.

COMPOUNDS X AND Y

Silicone compound means a polyorganosiloxane compound, i.e. comprising at least two organosiloxane units, for example at least 5 organosiloxane units, notably at least 10 organosiloxane units. According to a particular embodiment, at least one of compounds X and Y, or compounds X and compounds Y are silicone compounds. Compounds X and Y can be aminated or non-aminated.

According to another embodiment, at least one of compounds X and Y is a polymer whose main chain is formed primarily of organosiloxane units. Among the silicone compounds mentioned below, some may display both film-forming and adhesive properties, depending for example on their proportion of silicone or depending on whether they are used mixed with a particular additive. It is therefore possible to adjust the film- forming properties or the adhesive properties of said compounds according to the proposed use, which is the case in particular for the so-called "room temperature vulcanization" reactive elastomeric silicones.

Compounds X and Y can react with each other at a temperature varying between room temperature and 180⁰C. Advantageously, compounds X and Y are capable of reacting together at room temperature (20 ± 5°C) and atmospheric pressure, or advantageously, in the presence of a catalyst by a hydrosilylation reaction or a condensation reaction, or a crosslinking reaction in the presence of a peroxide.

Polar groups

According to a particular embodiment, at least one of compounds X and Y, for example compound X, bears at least one polar group that is able to form at least one hydrogen bond with keratinous substances.

By polar group, we mean a group having carbon atoms and hydrogen atoms in its chemical structure and at least one heteroatom (such as O, N, S and P), such that said group is able to establish at least one hydrogen bond with keratinous substances.

Compounds bearing at least one group that can form a hydrogen bond are particularly advantageous, as they endow the compositions containing them with better adherence on keratinous substances. The polar group or groups borne by at least one of compounds X and Y is/are able to establish a hydrogen bond, and include either a hydrogen atom bound to an electronegative atom, or an electronegative atom for example an oxygen, nitrogen or sulphur atom. When the group has a hydrogen atom bound to an electronegative atom, the hydrogen atom can interact with another electronegative atom borne for example by another molecule, such as keratin, to form a hydrogen bond. When the group has an electronegative atom, the electronegative atom can interact with a hydrogen atom bound to an electronegative atom borne for example by another molecule, such as keratin, to form a hydrogen bond.

Advantageously, these polar groups can be selected from the following groups: - carboxylic acids -COOH, alcohols, such as: -CH₂OH or -CH(R)OH, R being an alkyl radical having from 1 to 6 carbon atoms, amino of formula -NRiR₂, in which Rj and R₂, which may be identical or different, represent an alkyl radical having from 1 to 6 carbon atoms or one of Ri or R₂ denotes a hydrogen atom, and the other one of Ri and R2 represents an alkyl radical having from 1 to 6 carbon atoms, pyridino, amido of formula -NH-COR' or -CO-NH-R in which R represents a hydrogen atom or an alkyl radical having from 1 to 6 carbon atoms, pyrrolidino preferably selected from the groups of formula:

Ri being an alkyl radical having from 1 to 6 carbon atoms,

- carbamoyl of formula -0-CO-NH-R' or -NH-CO-OR, R' being as defined above,

- thiocarbamoyl such as -O-CS-NH-R or -NH-CS-OR, R' being as defined above, ureyl such as -NR'-C0-N(R')₂, the groups R, which may be identical or different, being as defined above, sulphonamido such as -NR'-S(=0)2-R, R corresponding to the above definition. Preferably, these polar groups are present at a content less than or equal to

10 wt. % relative to the weight of each compound X or Y, preferably less than or equal to 5 wt.%, for example at a content ranging from 1 to 3 wt.%.

The polar group or groups can be located in the main chain of compound X and/or Y or can be pendant from the main chain or located at the ends of the main chain of compound X and/or Y. 1- Compounds X and Y capable of reacting by hydrosilylation

According to one embodiment, the invention relates to a cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, with at least one of compounds X and Y being a silicone compound, and at least one catalyst, said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, when they are brought into contact with one another, and in which compounds X, Y and the catalyst are not present simultaneously in the same composition.

According to this embodiment, compounds X and Y are capable of reacting by hydrosilylation in the presence of a catalyst, said reaction being represented schematically in a simplified manner as follows:

Si-H CH =CH — W -Si-CH₁-CH₁-W

with W representing a carbon chain and/or silicone chain containing one or more unsaturated aliphatic groups.

In this case, compound X can be selected from silicone compounds comprising at least two unsaturated aliphatic groups.

As an example, compound X can be a polyorganosiloxane comprising a silicone main chain whose unsaturated aliphatic groups are pendent from the main chain

(side group) or located at the ends of the main chain of the compound (end group). These particular compounds will be called, hereinafter, polyorganosiloxanes with unsaturated aliphatic groups.

According to one embodiment, compound X and/or compound Y bear at least one polar group, as described above, capable of forming at least one hydrogen bond with keratinous substances. This polar group is advantageously carried by compound X, which has at least two unsaturated aliphatic groups.

According to one embodiment, compound X is selected from the polyorganosiloxanes comprising at least two unsaturated aliphatic groups, for example two or three vinyl or allyl groups, each attached to a silicon atom. According to an advantageous embodiment, compound X is selected from the polyorganosiloxanes containing siloxane units of formula:

m C 3~m)

(I) in which: - R represents a linear or cyclic, monovalent hydrocarbon group, having from 1 to 30 carbon atoms, preferably from 1 to 20, and better still from 1 to 10 carbon atoms, for example a short-chain alkyl radical, comprising for example from 1 to 10 carbon atoms, in particular a methyl radical or alternatively a phenyl group, preferably a methyl radical, - m is equal to 1 or 2 and

R' represents: o an unsaturated aliphatic hydrocarbon group having from 2 to

10, preferably from 3 to 5 carbon atoms, for example a vinyl group or a group -R"-CH=CHR'" in which R" is a divalent aliphatic hydrocarbon chain, having from 1 to 8 carbon atoms, bound to the silicon atom and R'" is a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms, preferably a hydrogen atom; we may mention, as group R', the vinyl and allyl groups and mixtures thereof; or o an unsaturated cyclic hydrocarbon group having from 5 to 8 carbon atoms, for example a cyclohexenyl group.

Preferably R' is an unsaturated aliphatic hydrocarbon group, preferably a vinyl group.

According to one embodiment, R represents an alkyl radical having from 1 to 10 carbon atoms or alternatively a phenyl group, and is preferably a methyl radical, and R' is a vinyl group.

According to a particular embodiment, the polyorganosiloxane also contains units of formula: n ( 4 ~n)

(H) in which R is a group as defined previously, and n is equal to 1, 2 or 3.

According to a variant, compound X can be a silicone resin comprising at least two ethylenic unsaturations, said resin being capable of reacting with compound Y by hydrosilylation in the presence of a catalyst. We may mention for example the resins of type MQ or MT which themselves bear -CH=CEb unsaturated reactive end groups.

These resins are crosslinked organosiloxane polymers.

The class of the silicone resins is known by the name "MDTQ", the resin being described in relation to the different siloxane monomer units that it contains, each of the letters "MDTQ" characterizing a type of unit.

The letter M represents the mono functional unit of formula (CH₃)₃SiOi/₂, the silicon atom being bound to a single oxygen atom in the polymer comprising said unit.

The letter D denotes a bifunctional unit (CH₃)₂Siθ₂/₂ in which the silicon atom is bound to two oxygen atoms. The letter T represents a trifunctional unit of formula (CH₃)SiO₃Q.

In units M, D, T defined above, at least one of the methyl groups can be substituted with a group R other than the methyl group, such as a hydrocarbon radical (notably alkyl) having from 2 to 10 carbon atoms or a phenyl group or alternatively a hydroxyl group. Finally, the letter Q denotes a tetrafunctional unit Siθ_4/2 in which the silicon atom is bound to four hydrogen atoms which are themselves attached to the rest of the polymer. As examples of said resins, we may mention the MT silicone resins such as poly(phenyl-vinylsilsesquioxane) such as that marketed under the reference SST-3PV1 by the company Gelest. Preferably, compounds X have from 0.01 to 1 wt.% of unsaturated aliphatic groups.

Advantageously, compound X is selected from the polyorganopolysiloxanes, notably those comprising the siloxane units (I) and optionally (II) described previously. Compound Y preferably has at least two free Si-H groups (hydrogenosilane groups).

Compound Y can be selected advantageously from the polyorganosiloxanes comprising at least one alkylhydrogenosiloxane unit of the following formula:

R HS tO

2

(III) in which:

R represents a linear or cyclic, monovalent hydrocarbon group, having from 1 to 30 carbon atoms, for example an alkyl radical having from 1 to 30 carbon atoms, preferably from 1 to 20 and better still from 1 to 10 carbon atoms, in particular a methyl radical, or alternatively a phenyl group and p is equal to 1 or 2. Preferably R is a hydrocarbon group, preferably methyl.

These polyorganosiloxane compounds Y with alkylhydrogenosiloxane units can additionally contain units of formula:

(H) as defined above.

Compound Y can be a silicone resin comprising at least one unit selected from the units M, D, T, Q as defined above and comprising at least one Si-H group such as the poly(methyl-hydridosilsesquioxane) marketed under the reference SST-3MH1.1 by the company Gelest. Preferably, these polyorganosiloxane compounds Y have from 0.5 to 2.5 wt.% of Si-H groups.

Advantageously, the radicals R represent a methyl group in formulae (I), (II), (III) above.

Preferably, these polyorganosiloxanes Y have end groups of formula (CHs)₃SiO₁₇₂. Advantageously, the polyorganosiloxanes Y have at least two alkylhydrogenosiloxane units of formula -(H₃C)(H)SiO- and optionally include -(H₃C)₂SiO- units.

These polyorganosiloxane compounds Y with hydrogenosilane groups are described for example in document EP 0465744.

According to one variant, compound X is selected from organic oligomers or polymers (by organic, we mean compounds whose main chain is not a silicone chain, preferably compounds not containing silicon atoms) or from hybrid organic/silicone polymers or oligomers, said oligomers or polymers bearing at least 2 unsaturated reactive aliphatic groups, compound Y being selected from the polyorganosiloxanes Y with hydrogenosilane groups mentioned above.

According to one embodiment, the organic or hybrid organic/silicone compounds X bearing at least 2 unsaturated reactive aliphatic groups, have at least one polar group as described above. Compound X, of organic nature, can then be selected from the vinylic,

(meth)acrylic polymers or oligomers, polyesters, polyurethanes and/or polyureas, polyethers, perfluoropolyethers, polyolefms such as polybutene, polyisobutylene, dendrimers or organic hyperbranched polymers, or mixtures thereof.

In particular, the organic polymer or the organic moiety of the hybrid polymer can be selected from the following polymers:

a) polyesters with ethylenic unsaturation(s):

This is a group of polymers of the polyester type having at least 2 ethylenic double bonds, randomly distributed in the main chain of the polymer. These unsaturated polyesters are obtained by polycondensation of a mixture: of linear or branched aliphatic or cycloaliphatic dicarboxylic acids notably having 3 to 50 carbon atoms, preferably from 3 to 20 and better still from 3 to 10 carbon atoms, such as adipic acid or sebacic acid, of aromatic dicarboxylic acids notably having from 8 to 50 carbon atoms, preferably from 8 to 20 and better still from 8 to 14 carbon atoms, such as phthalic acids, notably terephthalic acid, and/or of dicarboxylic acids derived from dimers of fatty acids with ethylenic unsaturations such as the dimers of oleic or linoleic acids described in application EP-A-959 066 (paragraph [0021]) marketed under the designations Pripol^® by the company Unichema or Empol^® by the company Henkel, all said diacids having to be free from polymerizable ethylenic double bonds, of linear or branched aliphatic or cycloaliphatic diols notably having from 2 to 50 carbon atoms, preferably from 2 to 20 and better still from 2 to 10 carbon atoms, such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol or cyclohexanedimethanol, of aromatic diols having from 6 to 50 carbon atoms, preferably from 6 to 20 and better still from 6 to 15 carbon atoms such as bisphenol A and bisphenol B, and/or of diol dimers resulting from reduction of dimers of fatty acids as defined previously, and of one or more dicarboxylic acids or their anhydrides having at least one polymerizable ethylenic double bond and having from 3 to 50 carbon atoms, preferably from 3 to 20 and better still from 3 to 10 carbon atoms, such as maleic acid, fumaric acid or itaconic acid.

b) polyesters with (meth)acrylate side and/or end groups: This is a group of polymers of the polyester type obtained by polycondensation of a mixture: of linear or branched aliphatic or cycloaliphatic dicarboxylic acids notably having from 3 to 50 carbon atoms, preferably from 3 to 20 and better still from 3 to 10 carbon atoms, such as adipic acid or sebacic acid, of aromatic dicarboxylic acids notably having from 8 to 50 carbon atoms, preferably from 8 to 20 and better still from 8 to 14 carbon atoms, such as phthalic acids, notably terephthalic acid, and/or of dicarboxylic acids derived from dimers of fatty acids with an ethylenic unsaturation such as the dimers of oleic or linoleic acids described in application EP-A-959 066 (paragraph [0021]) marketed under the designations Pripol® by the company Unichema or Empol® by the company Henkel, all said diacids having to be free from polymerizable ethylenic double bonds, of linear or branched aliphatic or cycloaliphatic diols notably having from 2 to 50 carbon atoms, preferably from 2 to 20 and better still from 2 to 10 carbon atoms, such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol or cyclohexanedimethanol, of aromatic diols having from 6 to 50 carbon atoms, preferably from 6 to 20 and better still from 6 to 15 carbon atoms such as bisphenol A and bisphenol B, and - of at least one ester of (meth)acrylic acid and of a diol or polyol having from 2 to 20 carbon atoms, preferably from 2 to 6 carbon atoms, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate and glycerol methacrylate.

These polyesters differ from those described above in section a) by the fact that the ethylenic double bonds are not located in the main chain but on side groups or at the end of the chains. These ethylenic double bonds are those of the (meth)acrylate groups present in the polymer.

Such polyesters are marketed for example by the company UCB under the designations EBECRYL® (EBECRYL® 450: molecular weight 1600, on average 6 acrylate functions per molecule, EBECRYL® 652: molecular weight 1500, on average 6 acrylate functions per molecule, EBECRYL® 800: molecular weight 780, on average 4 acrylate functions per molecule, EBECRYL® 810: molecular weight 1000, on average 4 acrylate functions per molecule, EBECRYL® 50 000: molecular weight 1500, on average 6 acrylate functions per molecule).

c) polyurethanes and/or polyureas with (meth)acrylate groups, obtained by polycondensation: of aliphatic, cycloaliphatic and/or aromatic diisocyanates, triisocyanates and/or polyisocyanates notably having from 4 to 50, preferably from 4 to 30 carbon atoms, such as hexamethylenediisocyanate, isophoronediisocyanate, toluenediisocyanate, diphenylmethanediisocyanate or isocyanurates of formula:

O Il

OCN-R-N N-R-NCO

o*^C\_N/^C*o

I R-NCO resulting from the trimerization of 3 molecules of diisocyanates OCN-R-CNO, where R is a linear, branched or cyclic hydrocarbon radical having from 2 to 30 carbon atoms; - of polyols, notably of diols, free from polymerizable ethylenic unsaturations, such as 1,4-butanediol, ethylene glycol or trimethylolpropane, and/or of polyamines, notably of aliphatic, cycloaliphatic and/or aromatic diamines, notably having from 3 to 50 carbon atoms, such as ethylenediamine or hexamethylenediamine, and - of at least one ester of (meth)acrylic acid and of a diol or polyol having from 2 to 20 carbon atoms, preferably from 2 to 6 carbon atoms, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate and glycerol methacrylate.

These polyurethanes/polyureas with acrylate groups are marketed for example under the designation SR 368 (tris(2-hydroxyethyl)isocyanurate-triacrylate) or CRAYNOR® 435 by the company CRAY VALLEY, or under the designation EBECRYL® by the company UCB (EBECRYL® 210: molecular weight 1500, 2 acrylate functions per molecule, EBECRYL® 230: molecular weight 5000, 2 acrylate functions per molecule, EBECRYL® 270: molecular weight 1500, 2 acrylate functions per molecule, EBECRYL® 8402: molecular weight 1000, 2 acrylate functions per molecule, EBECRYL® 8804: molecular weight 1300, 2 acrylate functions per molecule, EBECRYL® 220: molecular weight 1000, 6 acrylate functions per molecule, EBECRYL® 2220: molecular weight 1200, 6 acrylate functions per molecule, EBECRYL® 1290: molecular weight 1000, 6 acrylate functions per molecule, EBECRYL® 800: molecular weight 800, 6 acrylate functions per molecule). We may also mention the water-soluble aliphatic diacrylate polyurethanes marketed under the designations EBECRYL® 2000, EBECRYL® 2001 and EBECRYL® 2002, and the diacrylate polyurethanes in aqueous dispersion marketed under the trade names IRR® 390, IRR® 400, IRR® 422 IRR® 424 by the company UCB.

d) polyethers with (meth)acrylate groups obtained by esterification, by (meth)acrylic acid, of the hydroxyl end groups of homopolymers or of Ci_₄ alkylene glycol copolymers, such as polyethylene glycol, polypropylene glycol, copolymers of ethylene oxide and of propylene oxide preferably having a weight-average molecular weight below 10 000, polyethoxylated or polypropoxylated trimethylolpropane.

Di(meth)acrylate polyoxyethylenes of suitable molecular weight are marketed for example under the designations SR 259, SR 344, SR 610, SR 210, SR 603 and SR 252 by the company CRAY VALLEY or under the designation EBECRYL® 11 by UCB. Polyethoxylated trimethylolpropane triacrylates are marketed for example under the designations SR 454, SR 498, SR 502, SR 9035, SR 415 by the company CRAY VALLEY or under the designation EBECRYL® 160 by the company UCB. Polypropoxylated trimethylolpropane triacrylates are marketed for example under the designations SR 492 and SR 501 by the company CRAY VALLEY.

e) epoxyacrylates obtained by reaction between at least one diepoxide selected for example from:

(i) bisphenol A diglycidyl ether, (ii) a diepoxy resin resulting from the reaction between bisphenol

A diglycidyl ether and epichlorohydrin,

(iii) an epoxyester resin with α.ω-diepoxy end groups resulting from the condensation of a dicarboxylic acid having from 3 to 50 carbon atoms with a stoichiometric excess of (i) and/or (ii), (iv) an epoxyether resin with α,ω-diepoxy end groups resulting from the condensation of a diol having from 3 to 50 carbon atoms with a stoichiometric excess of (i) and/or (ii), (v) natural or synthetic oils bearing at least 2 epoxide groups, such as epoxidized soya oil, epoxidized linseed oil and epoxidized vernonia oil,

(vi) a phenol- formaldehyde polycondensate (Novolac^® resin), of which the end groups and/or side groups have been epoxidized, and one or more carboxylic acids or carboxylic polyacids having at least one ethylenic double bond at α,β of the carboxyl group such as (meth)acrylic acid or crotonic acid or esters of (meth)acrylic acid and of a diol or polyol having from 2 to 20 carbon atoms, preferably from 2 to 6 carbon atoms such as 2-hydroxyethyl (meth)acrylate.

Such polymers are marketed for example under the designations SR 349, SR

601, CD 541, SR 602, SR 9036, SR 348, CD 540, SR 480, CD 9038 by the company

CRAY VALLEY, under the designations EBECRYL^® 600 and EBECRYL^® 609, EBECRYL^® 150, EBECRYL^® 860, EBECRYL^® 3702 by the company UCB and under the designations PHOTOMER^® 3005 and PHOTOMER^® 3082 by the company HENKEL.

f) (Ci-50 alkyl) poly(meth)acrylates, said alkyl being linear, branched or cyclic, bearing at least two functions with ethylenic double bond carried by the lateral and/or terminal hydrocarbon chains.

Such copolymers are marketed for example under the designations IRR® 375, OTA® 480 and EBECRYL® 2047 by the company UCB.

g) polyolefϊns such as polybutene, polyisobutylene,

h) perfluoropolyethers with acrylate groups obtained by esterifϊcation, for example by (meth)acrylic acid, of perfluoropolyethers bearing hydroxyl side and/or end groups.

These α,ω-diol perfluoropolyethers are described notably in EP-A- 1057849 and are marketed by the company AUSIMONT under the designation FOMBLIN® Z DIOL.

i) dendrimers and hyperbranched polymers bearing (meth)acrylate or (meth)acrylamide end groups obtained respectively by esterifϊcation or amidation of dendrimers and of hyperbranched polymers with hydroxyl or amino terminal functions, by (meth)acrylic acid.

The dendrimers (from the Greek dendron = tree) are "tree-like" polymer molecules, i.e. highly branched, invented by D.A. Tomalia and his team at the beginning of the 1990's (Donald A. Tomalia et al, Angewandte Chemie, Int. Engl. Ed., Vol. 29, No. 2, pages 138 - 175). They are structures constructed around a, generally polyvalent, central unit. Branched chain-extending units are arranged according to a perfectly defined structure around this central unit, thus giving rise to symmetrical, monodispersed macromolecules having a well-defined chemical and stereochemical structure. Dendrimers of the polyamidoamine type are marketed for example under the name STARBURST^® by the company DENDRITECH.

The hyperbranched polymers are polycondensates, generally of the polyester, polyamide or polyethyleneamine type, obtained from multifunctional monomers, which have a tree-like structure similar to that of the dendrimers but far less regular than the latter (see for example WO-A-93/17060 and WO 96/12754).

The company PERSTORP markets hyperbranched polyesters under the name BOLTORN^®. Hyperbranched polyethyleneamines are available under the name COMBURST^® from the company DENDRITECH. Hyperbranched poly(esteramide)s with hydroxyl end groups are marketed by the company DSM under the name HYBRANE^®.

These dendrimers and hyperbranched polymers, esterifϊed or amidated by acrylic and/or methacrylic acid, differ from the polymers described in sections a) to h) above by the very large number of ethylenic double bonds present. This increased functionality, generally greater than 5, makes them particularly useful in enabling them to act as a "crosslinking node", i.e. a multiple crosslinking site.

It is therefore possible to use these dendritic and hyperbranched polymers in association with one or more of the above polymers and/or oligomers a) to h).

Ia - Additional reactive compounds

According to one embodiment, the compositions containing compound X and/or Y can additionally comprise an additional reactive compound such as:

- organic or mineral particles having on their surface at least 2 unsaturated aliphatic groups - we may mention for example the silicas surface-treated for example with silicone compounds with vinylic groups such as for example cyclotetramethyltetravinylsiloxane-treated silica,

- silazane compounds such as hexamethyldisilazane. Ib - Catalyst

The hydrosilylation reaction takes place in the presence of a catalyst which can be present with one or other of the compounds X or Y or can be present on its own. For example, this catalyst can be present in the composition in an encapsulated form if the two compounds X and Y, which it must cause to interact, are present in this same composition in an unencapsulated form or conversely it can be contained there in an unencapsulated form if at least one of compounds X and Y is present in the composition in an encapsulated form. The catalyst is preferably based on platinum or tin. We may mention for example platinum-based catalysts deposited on a support of silica gel or of powdered charcoal, platinum chloride, salts of platinum and of chloroplatinic acids.

The chloroplatinic acids are preferably used in hexahydrate or anhydrous form, which are easily dispersible in organosilicone media. We may also mention platinum complexes, such as those based on chloroplatinic acid hexahydrate and divinyl tetramethyldisiloxane.

The catalyst can be present at a content in the range from 0.0001 to 20 wt.% relative to the total weight of the composition containing it.

Compounds X and/or Y can be combined with polymerization inhibitors or retarders, and more particularly inhibitors of the catalyst. Non-limitatively, we may mention cyclic polymethylvinylsiloxanes, and in particular tetravinyl tetramethyl cyclotetrasiloxane, acetylenic alcohols, preferably volatile, such as methylisobutynol.

The presence of ionic salts, such as sodium acetate, can have an influence on the rate of polymerization of the compounds.

As an example of a combination of compounds X and Y reacting by hydrosilylation in the presence of a catalyst, we may mention the following references offered by the company Dow Corning: DC 7-9800 Soft Skin Adhesive Parts A & B, as well as the combination of the following mixtures A and B prepared by Dow Corning: MIXTURE A:

MIXTURE B:

Advantageously, compounds X and Y are selected from silicone compounds capable of reacting by hydrosilylation in the presence of a catalyst; in particular compound

X is selected from the polyorganosiloxanes comprising units of formula (I) described above and compound Y is selected from organosiloxanes comprising alkylhydrogenosiloxane units of formula (III) described above.

According to a particular embodiment, compound X is a polydimethylsiloxane with vinylic end groups, and compound Y is a polymethylhydrogenosiloxane. 2/ Compounds X and Y capable of reacting by condensation

According to one embodiment, the invention relates to a cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, with at least one of compounds X and Y being a silicone compound, and optionally at least one catalyst, said compounds X and Y being capable of reacting together by a condensation reaction, when they are brought into contact with one another, and in which compounds X, Y and the catalyst, when it is present, are not present simultaneously in the same composition.

According to this embodiment, compounds X and Y are capable of reacting by condensation, either in the presence of water (hydrolysis) by reaction of 2 compounds bearing alkoxysilane groups, or by so-called "direct" condensation by reaction of a compound bearing alkoxysilane group(s) and a compound bearing silanol group(s) or by reaction of 2 compounds bearing silanol group(s).

When the condensation is carried out in the presence of water, the latter can in particular be the ambient humidity, the residual water of the skin, of the lips, of the eyelashes and/or of the nails, or water from an external source, for example by prior moistening of the keratinous substance (for example by an atomizer, by natural or artificial tears).

In this manner of reaction by condensation, compounds X and Y, which may be identical or different, can therefore be selected from silicone compounds whose main chain contains at least two alkoxysilane groups and/or at least two silanol (Si-OH) side groups or end groups.

According to one embodiment, compound X and/or compound Y bears at least one polar group, as described above, capable of forming at least one hydrogen bond with keratinous substances.

According to an advantageous embodiment, compounds X and/or Y are selected from the polyorganosiloxanes comprising at least two alkoxysilane groups. By "alkoxysilane group", we mean a group comprising at least one -Si-OR moiety, R being an alkyl group having from 1 to 6 carbon atoms. Compounds X and Y are notably selected from the polyorganosiloxanes comprising alkoxysilane end groups, more specifically those which have at least 2 alkoxysilane end groups, preferably trialkoxysilane end groups.

These compounds X and/or Y preferably mostly comprise units of formula:

' (IV) in which the groups R⁹ represent, independently of one another, a radical selected from alkyl groups having from 1 to 6 carbon atoms, phenyl groups, fluoroalkyl groups, and s is equal to 0, 1, 2 or 3. Preferably, groups R⁹ represent, independently of one another, an alkyl group having from 1 to 6 carbon atoms. As alkyl group, we may notably mention methyl, propyl, butyl, hexyl and mixtures thereof, preferably methyl or ethyl. As fluoroalkyl group, we may mention 3,3,3-trifluoropropyl.

According to a particular embodiment, compounds X and Y, which may be identical or different, are polyorganosiloxanes comprising units of formula:

in which R⁹ is as described above, preferably R⁹ is a methyl radical, and f is such that the polymer advantageously has a viscosity at 25°C in the range from 0.5 to 3000 Pa.s, preferably in the range from 5 to 150 Pa.s; for example f can range from 2 to 5000, preferably from 3 to 3000, and more preferably from 5 to 1000.

These polyorganosiloxane compounds X and Y contain at least 2 trialkoxysilane end groups per molecule of polymer, said groups having the following formula

- ZSⁱR^(OR)W- ^"

in which: the radicals R represent, independently, a methyl, ethyl, n-propyl, isopropyl, n- butyl, sec-butyl, isobutyl group, preferably a methyl or ethyl group,

R¹ is a methyl or ethyl group, x is equal to 0 or 1, preferably x is equal to 0 and Z is selected from: the divalent hydrocarbon groups that do not have an ethylenic unsaturation and have from 1 to 18 carbon atoms, preferably from 2 to 18 carbon atoms (alkylene groups), the combinations of divalent hydrocarbon radicals and siloxane segments of the following formula (IX):

R? JR.9

-G-(SiO)₀-Si-O-

R9 _R9

(IX)

R⁹ being as described above, G is a divalent hydrocarbon radical without an ethylenic unsaturation and having from 1 to 18 carbon atoms, preferably from 2 to 18 carbon atoms and c is an integer in the range from 1 to 6.

Z and G can notably be selected from the alkylene groups such as methylene, ethylene, propylene, butylene, pentylene, hexylene, the arylene groups such as phenylene.

Preferably, Z is an alkylene group, and more preferably ethylene.

These polymers can have on average at least 1.2 trialkoxysilane end groups or terminal chains per molecule, and preferably on average at least 1.5 trialkoxysilane end groups per molecule. These polymers that can have at least 1.2 trialkoxysilane end groups per molecule, some can include other types of end groups such as end groups of formula CH₂=CH-SiR⁹ ₂- or of formula R⁶3-Si-, in which R⁹ is as defined previously and each group R⁶ is selected independently from the R⁹ or vinyl groups. As examples of said end groups, we may mention the trimethoxysilane, triethoxysilane, vinyldimethoxysilane and vinylmethyloxyphenylsilane groups. Such polymers are notably described in documents US 3 175 993, US

4 772 675, US 4 871 827, US 4 888 380, US 4 898 910, US 4 906 719 and US 4 962 174, the contents of which are incorporated by reference in the present application.

We may mention, as compound X and/or Y, in particular the polyorganosiloxanes selected from the polymers of formula:

R¹ _X R⁹ R⁹ R¹ _X

! J i I (RO^_xSi - Z -<StO)fSi-Z-Si(OR)3._K

! i (VII) in which R, R¹, R⁹, Z, x and f are as described above.

Compounds X and/or Y can also include a mixture of polymers of formula (VII) above with polymers of the following formula (VIII):

El* It? R9 Rl CHk=CH-SiO* SiO)fSi-Z-Si<OR)3._x

_K9 '_R9 R9 (VIII) in which R, R¹, R⁹, Z, x, and f are as described above.

When the polyorganosiloxane compound X and/or Y with alkoxysilane group(s) includes said mixture, the various polyorganosiloxanes are present at contents such that the organosilyl terminal chains represent less than 40%, preferably less than 25% in number o f terminal chains .

Polyorganosiloxane compounds X and/or Y that are particularly preferred are those of formula (VII) described above. Such compounds X and/or Y are described for example in document WO 01/96450.

As stated above, compounds X and Y can be identical or different. In particular, compounds X and Y can represent a mixture of polydimethylsiloxanes with methoxysilane groups.

According to a variant, one of the 2 reacting compounds X or Y is of silicone character and the other is of organic character. For example, compound X is selected from organic oligomers or polymers or hybrid organic/silicone oligomers or polymers, said polymers or oligomers comprising at least two alkoxysilane groups, and Y is selected from silicone compounds such as the polyorganosiloxanes described above. In particular, the organic oligomers or polymers are selected from the vinylic, (meth)acrylic oligomers or polymers, polyesters, polyamides, polyurethanes and/or polyureas, polyethers, polyolefms, perfluoropolyethers, dendrimers and hyperbranched organic polymers, and mixtures thereof.

According to one embodiment, compound X of organic character or of hybrid organic/silicone character bears at least one polar group, as described above, capable of forming at least one hydrogen bond with the keratinous substance.

The organic polymers of vinylic or (meth)acrylic character, bearing alkoxysilane side groups, can in particular be obtained by copolymerization of at least one vinylic or (meth)acrylic organic monomer with a (meth)acryloxypropyltrimethoxysilane, a vinyltrimethoxysilane, a vinyltriethoxysilane, an allyltrimethoxysilane etc.

We may mention for example the (meth)acrylic polymers described in the document of KUSABE, M, Pitture e Verniei - European Coating; 12-B, pages 43-49,

2005, and notably the polyacrylates with alkoxysilane groups with the designation MAX from Kaneka or those described in the work by PROBSTER, M, Adhesion-Kleben &

Dichten, 2004, 481 (1-2), pages 12-14.

The organic polymers resulting from a poly condensation or a polyaddition, such as polyesters, polyamides, polyurethanes and/or polyureas, polyethers, and bearing alkoxysilane side and/or end groups, can result for example from reaction of an oligomeric prepolymer as described above with one of the following silane reaction partners bearing at least one alkoxysilane group: aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminoethyl aminopropyl trimethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, epoxycyclohexylethyltrimethoxysilane, mercaptopropyltrimethoxysilane .

Examples of polyethers and polyisobutylenes with alkoxysilane groups are described in the work by KUSABE, M., Pitture e Verniei - European Coating; 12-B, pages 43-49, 2005. As examples of polyurethanes with alkoxysilane end groups, we may mention those described in the document PROBSTER, M., Adhesion-Kleben & Dichten, 2004, 481 (1-2), pages 12-14 or alternatively those described in the document LANDON, S., Pitture e Verniei Vol. 73, No. 11, pages 18-24, 1997 or in the document HUANG, Mowo, Pitture e Verniei Vol. 5, 2000, pages 61-67, and we may notably mention the polyurethanes with alkoxysilane groups from OSI-WITCO-GE. As polyorganosiloxane compounds X and/or Y, we may mention the resins of type MQ or MT which themselves bear alkoxysilane and/or silanol end groups, for example the poly(isobutylsilsesquioxane) resins functionalized with silanol groups offered under reference SST-S7C41 (three Si-OH groups) by the company Gelest.

2a - Additional reactive compound

According to one embodiment, compound X and/or Y can additionally be combined with an additional reactive compound comprising at least two alkoxysilane or silanol groups.

We may mention for example:

•one or more organic or mineral particles with alkoxysilane and/or silanol groups on their surface, for example fillers surface-treated with said groups.

2b - Catalyst

The condensation reaction can take place in the presence of a metal-based catalyst which can be present with one or other of the compounds X or Y or can be present on its own. For example, said catalyst can be present in the composition in an encapsulated form if the two compounds X and Y, which it is to cause to interact, are present in this same composition in an unencapsulated form or conversely it can be present there in an unencapsulated form if at least one of compounds X and Y is present in the composition in an encapsulated form. The catalyst for use in this type of reaction is preferably a titanium- based catalyst.

We may notably mention the catalysts based on tetraalkoxytitanium of formula:

in which R² is selected from the tertiary alkyl radicals such as tert-butyl, tert- amyl and 2,4-dimethyl-3-pentyl; R³ represents an alkyl radical having from 1 to 6 carbon atoms, preferably a methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, hexyl group and y is a number in the range from 3 to 4, preferably from 3.4 to 4.

The catalyst can be present at a content ranging from 0.0001 to 20 wt.% relative to the total weight of the composition containing it.

2c - Diluent

The compositions that can be used, comprising X and/or Y, can additionally include a volatile silicone oil (or diluent) for lowering the viscosity of the composition.

Said oil can be selected from the short-chain linear silicones such as hexamethyldisiloxane, octamethyltrisiloxane, cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and mixtures thereof.

This silicone oil can represent from 5 to 95 wt.%, preferably from 10 to 80 wt. % relative to the weight of each composition.

As an example of a combination of compounds X and Y bearing alkoxysilane groups and reacting by condensation, we may mention the combination of the following mixtures A' and B' produced by the company Dow Corning:

Mixture A':

Mixture B':

It should be noted that compounds X and Y, identical, are combined in mixture A' (cf. (I))

3/ Crosslinking in the presence of peroxide;

According to one embodiment, the invention relates to a cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y and at least one peroxide, with at least one of compounds X and Y being a silicone compound, said compounds X and Y being capable of reacting together by a crosslinking reaction in the presence of a peroxide, when they are brought into contact with one another, and in which compounds X, Y and the peroxide are not present simultaneously in the same composition. This reaction is preferably effected by heating to a temperature greater than or equal to 5O⁰C, preferably greater than or equal to 80⁰C, and up to 12O⁰C.

Compounds X and Y, which may be identical or different, have in this case at least two -CH₃ side groups and/or at least two side chains bearing a -CH₃ group.

Compounds X and Y are preferably silicone compounds and can be selected for example from the non- volatile linear polydimethylsiloxanes of high molecular weight, having a degree of polymerization above 6 and with at least two -CH₃ side groups attached to the silicon atom and/or at least two side chains bearing a -CH₃ group. We may mention for example the polymers described in the Catalogue "Reactive Silicones" of the company

Gelest Inc., Edition 2004, page 6, and notably the copolymers (also called gums) of vinylmethylsiloxane-dimethylsiloxane of molecular weight in the range from 500 000 to

900 000 and notably with viscosity above 2 000 000 cSt.

As peroxides that can be used in the invention, we may mention benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and mixtures thereof.

According to one embodiment, the hydrosilylation reaction in the presence of a catalyst, or the condensation reaction, or alternatively the crosslinking reaction in the presence of a peroxide, between compounds X and Y is accelerated by supply of heat, for example by raising the temperature of the system between 25°C and 18O⁰C.

In general, regardless of the type of reaction by which compounds X and Y react with one another, the molar percentage of X relative to the total of compounds X and Y, i.e. the ratio X/(X+Y) x 100, can vary from 5 to 95%, preferably from 10 to 90%, and more preferably from 20 to 80%.

Similarly, the molar percentage of Y relative to the total of compounds X and Y, i.e. the ratio Y/(X+Y) x 100, can vary from 5 to 95%, preferably from 10 to 90%, and more preferably from 20 to 80%. Compound X can have a weight-average molecular weight (Mw) in the range from 150 to 1 000 000, preferably from 200 to 800 000, more preferably from 200 to 250 000. Compound Y can have a weight-average molecular weight (Mw) in the range from 200 to 1 000 000, preferably from 300 to 800 000, more preferably from 500 to 250 000.

Compound X can represent from 0.1 to 95 wt.% relative to the total weight of the composition containing it, preferably from 1 to 90%, and more preferably from 5 to 80%.

Compound Y can represent from 0.1 to 95 wt.% relative to the total weight of the composition containing it, preferably from 1 to 90%, and more preferably from 5 to 80%. The ratio of compound X to compound Y can be varied so as to adjust the reaction rate and therefore the rate of formation of the film or alternatively so as to adapt the properties of the film formed (for example its adhesive properties) according to the intended application.

In particular, compounds X and Y can be present in the compositions of the invention at a molar ratio X/Y in the range from 0.05 to 20 and preferably from 0.1 to 10.

Compounds X and Y can advantageously be combined with at least one filler.

Thus, the kit according to the invention can for example include, in at least one of the compositions, a filler selected from silica or surface-treated silica.

As pointed out previously, according to one embodiment of the invention, compounds X and Y can be used in the form of a single composition which then contains at least one of them or, if applicable, the catalyst or the peroxide if necessary for their interaction, in an encapsulated form.

Within the scope of the present invention, consideration is given more particularly to the encapsulated forms of the core/shell type, also called microcapsules or nanocapsules, in which the shell is of polymeric character and the core contains compound X, compound Y, one of its compounds X and Y possibly being encapsulated with the catalyst or the peroxide if necessary for the interaction of the two compounds. In the case when this catalyst is not encapsulated with one or other of the compounds X or Y, it is present in the cosmetic composition containing the encapsulated forms. Numerous techniques are currently available for making microcapsules or nanocapsules of this type.

However, according to a preferred embodiment, the encapsulated forms considered according to the invention are nanocapsules and are obtained by a technique called solvent nanoprecipitation, notably described in documents EP 274 961 and EP 1 552

820.

More particularly, the shell of the nanocapsules of compound X or Y, employed according to the invention, is of polymeric character, not crosslinked, not water- soluble and not soluble in the capsule core.

In general, all the polymers, of natural or synthetic origin, soluble in a solvent that is not miscible with water, and notably those having a melting point below the boiling point of water at atmospheric pressure (100⁰C), may be suitable.

These polymers can be biodegradable, for example polyesters, or nonbiodegradable.

By way of illustration of polymers that are suitable for the invention, we may notably mention:

C₂-C₁₂ alkyl cyanoacrylate polymers polymers formed by poly-L-lactides, poly-DL-lactides, polyglycolides and the corresponding copolymers, polycapro lactones, - polymers of 3-hydroxybutyric acid, copolymers of vinyl chloride and vinyl acetate, copolymers of methacrylic acid and methacrylic ester, notably of methacrylic acid and of methacrylate, polyvinyl acetophthalate, - cellulose acetophthalate, polyvinylpyrrolidone-vinyl acetate copolymer, polyethylenevinyl acetates, polyacrylonitriles, polyacrylamides, - polyethylene glycols, poly-(Ci to C₄ hydroxyalkyl methacrylate) esters of cellulose and C1-C4 carboxylic acid, polystyrene and copolymers of styrene and maleic anhydride, copolymers of styrene and acrylic acid, styrene ethylene/butylene-styrene block terpolymers, styrene- ethylene/propylene-styrene block terpolymers, styrene alkyl- alcohol oligomers, terpolymers of ethylene, vinyl acetate and maleic anhydride, - polyamides, polyethylenes, polypropylenes, organopolysiloxanes including polydimethylsiloxanes, poly(alkylene adipate), - polyol polyesters, polysilsesquioxane silicone polymers, dendritic polyesters with a hydroxyl terminal function, polymers that are water-dispersible but are nevertheless soluble in solvents that are not miscible with water, for example: polyesters, poly(ester amides), polyurethanes and vinyl copolymers bearing carboxylic and/or sulphonic acid functions and in particular those described in document FR 2 787 729, block copolymers insoluble in water at room temperature and solid at room temperature, having at least one block of one of the aforementioned polymers, and mixtures thereof.

These polymers or copolymers can have a weight-average molecular weight between 1000 and 500 000 and in particular between 1500 and 100 000.

The following are quite particularly suitable for the invention: poly(alkylene adipate), organopolysiloxanes, polycapro lactones, cellulose acetophthalate, cellulose acetobutyrate, cellulose esters, polystyrene and its derivatives, and notably polycapro lactones.

Of course, a person skilled in the art is able, on the basis of his knowledge, to adjust the molecular weight of the polymer selected with respect to its concentration in the solvent so as have a mixture viscosity compatible with satisfactory emulsification. With regard to the lipophilic core, it can contain at least one oil, in addition to compound X or compound Y. Said oil can be selected from the oils described hereunder for the oily phase. The oil is preferably a silicone oil.

According to a variant of the invention, the encapsulated forms of compound X or compound Y can be coated with a lamellar phase.

Regarding the operating procedure for production of nanocapsules suitable for the invention, a person skilled in the art can notably refer to the teaching in document EP 1 552 820 cited previously. The choice of the necessary surfactants as well as the carrying out of the method requires the knowledge of a person skilled in the art.

OTHER COMPONENTS

Typically, the compositions according to the invention may comprise a physiologically acceptable medium. The expression "physiologically acceptable medium" denotes a medium that is not toxic and that is capable of being applied to the skin, the integuments or the lips of human beings. The physiologically acceptable medium is generally adapted to the nature of the support on which the composition must be applied and also to the form in which the composition is packaged.

The compositions may comprise ingredients other than those described above, especially at least one solvent, a fatty phase, a film- forming polymer and/or a dermato logical or cosmetic active agent, in particular as a function of the dosage form.

Solvents

The compositions may comprise at least one aqueous or organic solvent, especially a volatile organic solvent.

The compositions may advantageously comprise a volatile solvent, especially an organic volatile solvent.

In the sense of the present invention, the expression "volatile solvent" is understood to mean a solvent, liquid at ambient temperature, in particular having a non- zero vapour pressure at ambient temperature and atmospheric pressure, in particular having a vapour pressure ranging from 0.13 Pa to 40 000 Pa (10^~3 to 300 mm Hg), and preferably ranging from 1.3 Pa to 13 000 Pa (0.01 to 100 mm Hg), and preferably ranging from 1.3 Pa to 1300 Pa (0.01 to 10 mm Hg).

When the compositions contain one or more organic solvents, these solvents may be present in an amount ranging from 0.1% to 99%, relative to the total weight of the composition in question.

Generally, the amount of solvent(s), especially organic solvent(s), will depend on the nature of the support on which the composition is intended to be applied.

The compositions may comprise at least one volatile solvent composed of a volatile oil.

The oil may be a silicone oil or a hydrocarbon oil, or comprise a mixture of such oils.

In the sense of the present invention, the expression "silicone oil" is understood to mean an oil comprising at least one silicon atom, and especially at least one Si-O group.

The expression "hydrocarbon oil" is understood to mean an oil that mainly contains hydrogen and carbon atoms and optionally oxygen, nitrogen, sulphur and/or phosphorus atoms.

The volatile hydrocarbon oils may be chosen from hydrocarbon oils having from 8 to 16 carbon atoms, and especially Cs-Ciβ branched alkanes (also known as isoparaffms) such as isododecane (also called 2,2,4,4,6-pentamethylheptane), isodecane, isohexadecane, and for example the oils sold under the trade names ISOPARS® or PERMETHYLS®.

As volatile oils, volatile silicones may also be used, such as for example the volatile linear or cyclic silicone oils, especially those having a viscosity < 8 centistokes

(8 x 10^~6 m²/s), and especially having from 2 to 10 silicon atoms, and in particular from 2 to 7 silicon atoms, these silicones optionally comprising alkyl or alkoxy groups having from 1 to 10 carbon atoms. As a volatile silicone oil that can be used in the invention, mention may especially be made of dimethicones with a viscosity of 5 and 6 cSt, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexa- siloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, and mixtures thereof.

Mention may also be made of volatile linear alkyltrisiloxane oils of general formula (I):

R where R represents an alkyl group comprising from 2 to 4 carbon atoms and of which one or more hydrogen atoms may be substituted by a fluorine or chlorine atom. Among the oils of general formula (I), mention may be made of: 3-butyl- 1 , 1 , 1 ,3 ,5 ,5 ,5-heptamethyltrisiloxane; 3-propyl- 1,1,1,3 ,5 ,5 ,5-heptamethyltrisiloxane; and 3-ethyl- 1 , 1 , 1 ,3 ,5,5,5-heptamethyltrisiloxane, corresponding to the oils of formula (I) for which R is respectively a butyl group, a propyl group or an ethyl group.

It is also possible to use volatile fluorinated oils such as nonafluoromethoxybutane or perfluoromethylcyclopentane, and mixtures thereof.

A composition according to the invention may comprise, for example, between 0.01% and 95% by weight of volatile oil, relative to the total weight of the composition, better still between 1 % and 75% by weight.

The compositions may comprise at least one organic solvent chosen from the following list:

- ketones that are liquid at ambient temperature, such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, isophorone, cyclohexanone or acetone;

- alcohols that are liquid at ambient temperature such as ethanol, isopropanol, diacetone alcohol, 2-butoxyethanol or cyclohexanol;

- glycols that are liquid at ambient temperature such as ethylene glycol, propylene glycol, pentylene glycol or glycerol; - propylene glycol ethers that are liquid at ambient temperature such as propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate or dipropylene glycol mono-n-butyl ether;

- short chain esters (having from 3 to 8 carbon atoms in total) such as ethyl acetate, methyl acetate, propyl acetate, n-butyl acetate or isopentyl acetate; and

- alkanes that are liquid at ambient temperature such as decane, heptane, dodecane or cyclohexane.

The compositions may also comprise water or a mixture of water and hydrophilic organic solvents commonly used in cosmetics such as alcohols and especially linear or branched lower monoalcohols having from 2 to 5 carbon atoms such as ethanol, isopropanol or n-propanol, polyols such as glycerol, diglycerol, propylene glycol, sorbitol, pentylene glycol or polyethylene glycols. The compositions may, in addition, contain hydrophilic C₂-C₄ aldehydes and C₂ ethers. The water or mixture of water and hydrophilic organic solvents may be present in the first and/or the second composition in an amount ranging, for example, from 0% to 90%, especially from 0.1% to 90% by weight and preferably from 0% to 60% by weight, especially from 0.1% to 60% by weight, relative to the total weight of the composition.

Fatty phase

The compositions, for example when they are intended to be applied to the lips, may comprise a fatty phase and especially a fatty substance that is liquid at ambient temperature (25°C) and/or a fatty substance that is solid at ambient temperature such as waxes, pasty fatty substances, gums and mixtures thereof. The fatty phase may, in addition, contain lipophilic organic solvents.

Thus, according to a particular embodiment, at least one of the compositions of a kit in accordance to the invention, comprises a fatty phase.

The compositions may have, for example, a continuous fatty phase which may contain less than 5% water, especially less than 1% water relative to its total weight and in particular may be in an anhydrous form.

According to one embodiment variant, at least one of the compositions may be anhydrous.

In the sense of the invention, the expression "anhydrous composition" denotes a composition which contains less than 5% by weight, preferably less than 2% by weight water, or even less than 0.5% water relative to its total weight, and especially a composition that is free of water.

As fatty substances that are liquid at ambient temperature, often known as "oils", mention may be made of: hydrocarbon-based plant oils such as the liquid triglycerides of fatty acids having 4 to 10 carbon atoms such as the triglycerides of heptanoic or octanoic acids, or else sunflower oil, corn oil, soybean oil, grapeseed oil, sesame oil, apricot oil, macadamia oil, castor oil, avocado oil, triglycerides of caprylic/capric acids, jojoba oil, shea butter oil, lanolin, acetylated lanolin; linear or branched hydrocarbons of mineral or synthetic origin such as paraffin oils and derivatives thereof, vaseline, polydecenes, hydrogenated polyisobutene such as parleam; synthetic esters and ethers especially of fatty acids such as, for example, purcellin oil, isopropyl myristate, 2-ethylhexyl palmitate, 2-octyldodecyl stearate, 2-octyldodecyl erucate, isostearyl isostearate; hydroxylated esters such as isostearyl lactate, octyl hydroxystearate, octyldodecyl hydroxystearate, diisostearyl malate, triisocetyl citrate, fatty alcohol heptanoates, octanoates or decanoates; isononyl isononanoate, isopropyl lanolate, tridecyl trimellilate, diisostearyl malate, polyol esters such as propylene glycol dioctanoate, neopentyl glycol diheptanoate, diethylene glycol diisononanoate; pentaerythritol esters; fatty alcohols having from 12 to 26 carbon atoms such as octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol, oleyl alcohol; partially hydrocarbon-based and/or silicone-based fluoro oils; silicone oils such as polydimethylsiloxanes (PDMSs) that are volatile or non- volatile, linear or cyclic, liquid or pasty at ambient temperature such as cyclomethicones, dimethicones, optionally comprising a phenyl group, such as phenyltrimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenylmethyldimethyltrisiloxanes, diphenyldimethicones, phenyldimethicones, polymethylphenylsiloxanes; and mixtures thereof. The oils may be present in an amount ranging from 0.01 to 90%, and better still from 0.1 to 85% by weight, relative to the total weight of the composition. The compositions may comprise at least one structuring agent of the liquid fatty phase (formed by the oils and/or volatile or non-volatile organic solvents described above) chosen from waxes, semi-crystalline polymers, lipophilic gelling agents and mixtures thereof.

The pasty fatty substances are generally hydrocarbon-based compounds with a melting point between 25 and 60⁰C, preferably between 30 and 45°C, and/or a hardness between 0.001 and 0.5 MPa, preferably between 0.005 and 0.4 MPa, such as lanolins and derivatives thereof. The waxes may be solid at ambient temperature (25°C), with a reversible solid/liquid state change, having a melting point above 30⁰C which may range up to 200⁰C, a hardness above 0.5 MPa, and having an anisotropic crystalline organization in the solid state. In particular, the waxes may have a melting point above 25°C and better still above 45°C. The waxes may be hydrocarbon-based, fluoro-based and/or silicone-based and may be of plant, mineral, animal and/or synthetic origin. As waxes that can be used, mention may be made of beeswax, carnauba or candelilla wax, paraffin, microcrystalline waxes, ceresin or ozokerite; synthetic waxes such as polyethylene or Fischer-Tropsch waxes, silicone waxes such as alkyldimethicones or alkoxydimethicones having from 16 to 45 carbon atoms. The compositions may contain from 0 to 50% by weight of waxes, relative to the total weight of the composition, or even from 1 to 30% by weight.

The gums which may be used are generally high molecular weight polydimethylsiloxanes (PDMSs) or cellulose gums or polysaccharides.

Film- forming polymers

The compositions may also comprise, for example, a film-forming polymer, especially in the case of a mascara or a nail polish. The expression "film- forming polymer" denotes a polymer capable of forming, by itself or in the presence of an additional film- forming agent, a film that is continuous and that adheres to a support, especially to keratinous substances.

Among the film-forming polymers that can be used in the compositions according to the invention, mention may be made, among others, of synthetic polymers, of radical or polycondensate types, polymers of natural origin, such as nitrocellulose or cellulose esters, and mixtures thereof. The film- forming polymers of radical type may especially be vinyl polymers or copolymers, especially acrylic polymers.

The vinyl film-forming polymers may result from the polymerization of monomers with an ethylenic unsaturation having at least one acid group and/or esters of these acid monomers and/or amides of these acid monomers such as α,β-ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid or itaconic acid.

The vinyl film- forming polymers may also result from the homopolymerization or copolymerization of monomers chosen from vinyl esters such as vinyl acetate, vinyl neodecanoate, vinyl pivalate, vinyl benzoate and vinyl t-butylbenzoate and styrene monomers such as styrene and OC-methylstyrene.

Among the film-forming poly condensates, mention may be made of polyurethanes, polyesters, polyesteramides, polyamides and polyureas, this list not being limiting.

The optionally modified polymers of natural origin may be chosen from shellac resin, sandarac gum, dammar gums, elemi gums, copal resins, cellulose polymers, such as nitrocellulose, ethyl cellulose or nitrocellulose esters chosen, for example, from cellulose acetate, cellulose acetobutyrate, cellulose acetopropionate, and mixtures thereof.

The film-forming polymer may be present in the form of solid particles in aqueous or oily dispersion, generally known under the name of latex or pseudolatex. The film-forming polymer may comprise one or more stable dispersions of generally spherical polymer particles of one or more polymers, in a physiologically acceptable liquid fatty phase. These dispersions are generally called NADs (non-aqueous dispersions) of polymer as opposed to latex which are aqueous dispersions of polymer. These dispersions may especially be in the form of polymer nanoparticles in stable dispersion in said fatty phase. The nanoparticles preferably have a size between 5 and 600 nm. The techniques for preparing these dispersions are well known to a person skilled in the art. As an aqueous dispersion of a film- forming polymer, it is possible to use the acrylic dispersions sold under the names NEOCRYL XK-90®, NEOCRYL A-1070®, NEOCRYL A-1090®, NEOCRYL BT-62®, NEOCRYL A-1079®, NEOCRYL A-523® by Avecia-Neoresins, DOW LATEX 432® by Dow Chemical, DAITOSOL 5000 AD® by Daito Kasei Kogyo; or else aqueous dispersions of polyurethane sold under the names NEOREZ R-981®, NEOREZ R-974® by Avecia-Neoresins, AVALURE UR-405®, AVALURE UR-410®, AVALURE UR-425®, AVALURE UR-450®, SANCURE 875®, SANCURE 861®, SANCURE 878®, SANCURE 2060® by Goodrich, IMPRANIL 85® by Bayer, AQUAMERE H-1511® by Hydromer; sulphopolyesters sold under the brand name Eastman AQ by Eastman Chemical Products.

Film-forming block polymer

According to one embodiment of the invention, the compositions may comprise at least one film-forming polymer which is a film- forming ethylenic linear block polymer. This polymer preferably comprises at least a first block and at least a second block having different glass transition temperatures (T_gs), said first and second blocks being joined together by an intermediate block comprising at least one monomer that is a component of the first block and at least one monomer that is a component of the second block.

Advantageously, the first and second blocks of the block polymer are incompatible with one another.

Such polymers are described, for example, in documents EP 1 411 069 or WO 04/028488, which are incorporated by reference.

The compositions according to the invention may also comprise an additional film- forming agent that promotes the formation of a film with the film- forming polymer.

Fillers The compositions according to the invention may also comprise fillers.

The term "filler" denotes particles of any shape, that are insoluble in the medium of the composition, regardless of the temperature at which the composition is manufactured. A filler may especially be used to modify the rheology or the texture of the composition. The nature and amount of particles will depend on the desired mechanical properties and textures.

By way of example of fillers, mention may be made, amongst others, of talc, mica, silica, kaolin, sericite, polyamide powders, polyolefin powders, for example polyethylene powders, polytetrafluoroethylene powders, polymethyl methacrylate powders, polyurethane powders, starch powders and silicon resin beads. The fillers may be intended to create, amongst others, a soft focus effect, especially in the case of a foundation, in order to conceal imperfections of the skin.

Active agents

The compositions may comprise at least one cosmetic or dermato logical active agent. As cosmetic, dermato logical, hygienic or pharmaceutical active agents that can be used in the compositions of the invention, mention may be made of moisturizers (polyols, such as glycerol), vitamins (C, A, E, F, B or PP), essential fatty acids, essential oils, ceramides, sphingolipids, sunscreens that are liposoluble or in the form of nanoparticles, specific active agents for treatment of the skin (protective, antibacterial, anti-wrinkle agents, etc.), or self-tanning agents. These active agents may be used, for example, at concentrations from 0 to 20% and especially from 0.001 to 15% relative to the total weight of the composition.

The compositions may also contain ingredients commonly used in cosmetics, such as for example thickeners, surfactants, trace elements, moisturizers, softeners, sequestrants, fragrances, acidifying or basifying agents, preservatives, antioxidants, UV screening agents, dyes or mixtures thereof. In particular, at least one of the first and second compositions may comprise at least one colorant different from the reflective particles with metallic reflection.

The compositions according to the invention may comprise, depending on the type of application envisaged, the constituents conventionally used in the fields in question, which are present in an appropriate amount in the desired formulation form.

Formulation forms

The compositions may be in various forms, depending on their destination. The compositions may thus be in any dosage form normally used for a topical application and especially in anhydrous form, in the form of an oily or aqueous solution, an oily or aqueous gel, an oil-in-water, water-in-oil, wax-in-water or water-in-wax emulsion, a multiple emulsion, a dispersion of oil in water due to vesicles located at the oil/water interface.

Example

In the examples of compositions described hereunder, the combination of the following mixtures A and B produced by the company Dow Corning is used as combination of compounds X and Y: MIXTURE A:

MIXTURE B:

Example 1; Lipstick

The following kit was produced, in which the amounts are expressed as weight percentages.

First composition

- Mixture A 50.00% - DC Red 7 6.27%

- Phenyltrimethicone 1000 cSt 15.90%

- Phenyltrimethicone 20 cSt 27.83% Second composition

- Mixture B 50.00%

- Particles with metallic reflection

(METASHINE® ME 2040 PS from Nippon Sheet Glass) 3.00%

- Phenyltrimethicone 1000 cSt 23.10%

- Phenyltrimethicone 20 cSt 23.90%

Procedure First, a pigment homogenate in 20 cSt phenyltrimethicone was produced.

The various constituents of each composition were then mixed so as to form the first and second compositons, which were then stirred with a magnetic stirrer. The two compositions were then mixed in a 50:50 ratio.

Claims

1. Cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, and at least one catalyst, with at least one of compounds X and Y being a silicone compound, said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, when they are brought into contact with one another, and in which compounds X, Y and the catalyst are not present simultaneously in the same composition.

2. Kit according to claim 1 comprising at least: i. a first composition comprising, in a physiologically acceptable medium, at least one compound X and ii. a second composition comprising, in a physiologically acceptable medium, at least one compound Y, with at least one of said first and second compositions additionally comprising at least some reflective particles with metallic reflection, and at least one of said first and second compositions containing, in addition, at least one catalyst.

3. Kit according to claim 1 or 2, in which the reflective particles with metallic reflection have a multilayer structure and comprise a natural or synthetic substrate that is at least partially coated by at least one layer of a reflective material.

4. Kit according to claim 3, in which the substrate is chosen from glass, ceramics, graphite, metal oxides, aluminas, silicas, silicates, especially alumino silicates and borosilicates, synthetic mica and mixtures thereof.

5. Kit according to claim 3 or 4, in which the reflective material is chosen, for example, from titanium oxides, especially Tiθ₂, iron oxides, especially Fe₂θ3, tin and chromium oxides, barium sulphate and the following materials: MgF₂, CrF₃, ZnS, ZnSe, SiO₂, Al₂O₃, MgO, Y₂O₃, SeO₃, SiO, HfO₂, ZrO₂, CeO₂, Nb₂Os₁ Ta₂O₅, MoS₂ and mixtures or alloys thereof.

6. Kit according to any one of the preceding claims, in which the reflective particles with metallic reflection are present in an amount ranging from 0.1 to 60% by weight, in particular from 1 to 30% by weight, and for example from 3 to 10% by weight relative to the total weight of the composition containing them.

7. Kit according to any one of the preceding claims, characterized in that compound X is selected from silicone compounds comprising at least two unsaturated aliphatic groups.

8. Kit according to the preceding claim, in which compound X is a polyorganosiloxane comprising a silicone main chain whose unsaturated aliphatic groups are pendent from the main chain (side group) or located at the ends of the main chain of the compound (end group).

9. Kit according to the preceding claim, characterized in that compound X bears at least one polar group.

10. Kit according to any one of the preceding claims, characterized in that compound X is selected from the polyorganosiloxanes comprising at least two unsaturated aliphatic groups each attached to a silicon atom.

11. Kit according to any one of the preceding claims, characterized in that compound X is selected from the polyorganosiloxanes containing siloxane units of formula:

in which:

R represents a linear or cyclic, monovalent hydrocarbon group, having from 1 to 30 carbon atoms, m is equal to 1 or 2 and R' represents: • an unsaturated aliphatic hydrocarbon group having from 2 to 10, preferably from 3 to 5 carbon atoms or • an unsaturated cyclic hydrocarbon group having from 5 to 8 carbon atoms.

12. Kit according to the preceding claim, in which the polyorganosiloxane of formula (I) is such that R' represents a vinyl group or a group -R"-CH=CHR'" in which R" is a divalent aliphatic hydrocarbon chain, having from 1 to 8 carbon atoms, bound to the silicon atom and R'" is a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms, preferably a hydrogen atom.

13. Kit according to claim 11 or 12, characterized in that R represents an alkyl radical having from 1 to 10 carbon atoms or alternatively a phenyl group, and preferably a methyl group, and R' is a vinyl group.

14. Kit according to one of claims 8 to 13, characterized in that the polyorganosiloxanes additionally comprise units of formula:

R SiO , , , n { A -tϊ ) r (H) in which R represents a linear or cyclic, monovalent hydrocarbon group, having from 1 to 30 carbon atoms, and n is equal to 1, 2 or 3.

15. Kit according to one of claims 1 to 6, characterized in that compound X is selected from organic oligomers or polymers, hybrid organic/silicone oligomers or polymers, said oligomers or polymers bearing at least 2 unsaturated reactive aliphatic groups.

16. Kit according to one of the preceding claims, in which compound Y comprises at least two free Si-H groups.

17. Kit according to one of the preceding claims, characterized in that compound Y is selected from the polyorganosiloxanes comprising at least one alkylhydrogenosiloxane unit with the following formula:

in which: R represents a linear or cyclic, monovalent hydrocarbon group, having from 1 to 30 carbon atoms or a phenyl group, and p is equal to 1 or 2.

18. Kit according to the preceding claim, in which compound Y is such that the radicals R represent a C₁-CiO alkyl group, preferably methyl.

19. Kit according to one of claims 16 to 18, in which Y is a polyorganosiloxane comprising at least two alkylhydrogenosiloxane units of formula

-(H₃C)(H)Si-O- and optionally comprising units -(H₃C)₂SiO-.

20. Kit according to one of the preceding claims, in which the catalyst is a catalyst based on platinum or tin.

21. Kit according to the preceding claim, characterized in that the catalyst is present in a content ranging from 0.0001 to 20% by weight relative to the total weight of the composition containing it.

22. Kit according to any one of claims 1 to 16, characterized in that compound X is a polydimethylsiloxane with vinylic end groups and compound Y is a polymethylhydrogenosiloxane.

23. Kit according to any one of the preceding claims, in which compound X bears at least one polar group that is able to form a hydrogen bond with keratinous substances.

24. Kit according to any one of the preceding claims, comprising, in at least one of the compositions, a filler selected from silica or surface-treated silica.

25. Kit according to one of the preceding claims, characterized in that compound X has a weight-average molecular weight (Mw) in the range from 150 to 1 000 000, preferably from 200 to 800 000, more preferably from 200 to 250 000.

26. Kit according to one of the preceding claims, characterized in that compound Y has a weight-average molecular weight (Mw) in the range from 200 to

1 000 000, preferably from 300 to 800 000, more preferably from 500 to 250 000.

27. Kit according to one of the preceding claims, characterized in that compound X represents from 0.1 to 95% by weight relative to the total weight of the composition containing it, preferably from 1 to 90% and more preferably from 5 to 80%.

28. Kit according to one of the preceding claims, characterized in that compound Y represents from 0.1 to 95% by weight relative to the total weight of the composition containing it, preferably from 1 to 90% and more preferably from 5 to 80%.

29. Kit according to one of the preceding claims, characterized in that compounds X and Y are present in the compositions at a molar ratio XTY in the range from 0.05 to 20, and preferably from 0.1 to 10.

30. Kit according to any one of the preceding claims, in which each composition is packaged separately in the same packaging article.

31. Kit according to any one of the preceding claims, characterized in that at least one of the compositions comprises a fatty phase.

32. Kit according to any one of the preceding claims, in which at least one of the compositions is anhydrous.

33. Kit according to any one of the preceding claims, in which at least one of the compositions comprises at least one colorant different from the reflective particles with metallic reflection.

34. Cosmetic method for make-up and/or care of keratinous substance(s) comprising at least the application (a) of at least some reflective particles with metallic reflection, (b) of one or more compounds X, (c) of one or more compounds Y, with at least one of compounds X and Y being a silicone compound and said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, when they are brought into contact with one another, and (d) at least one catalyst, and applications (a), (b), (c) and (d) can be simultaneous or consecutive in any order provided that it promotes the interaction of said compounds X and Y.

35. Method according to the preceding claim, comprising applying, on said keratinous substances, at least one composition comprising, in a physiologically acceptable medium, at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y and at least one catalyst.

36. Method according to the preceding claim, in which the composition is obtained by mixing, in an extemporaneous way, a first composition comprising at least compound X and a second composition comprising at least compound Y, at least one of the first and second compositions comprising in addition at least some reflective particles with metallic reflection, and at least one of said first and second compositions comprising additionnaly at least one catalyst.

37. Cosmetic method for make-up and/or care of keratinous substance(s), comprising at least the application on said keratinous substances of at least: one layer of a first composition comprising, in a physiologically acceptable medium, one or more compounds X; and - one layer of a second composition comprising, in a physiologically acceptable medium, one or more compounds Y, with at least one of compounds X and Y being a silicone compound and said compounds X and Y being capable of reacting together by a hydrosilylation reaction in the presence of a catalyst, when they are brought into contact with one another, and at least one of the first and second compositions additionally comprising at least one catalyst, and at least one of said first and second compositions additionally comprising at least some reflective particles with metallic reflection.

38. Method according to one of claims 35 to 37, in which the composition(s) are as defined in any one of claims 1 to 33.

39. Method according to any one of claims 34 to 38, characterized in that it includes a supplementary step comprising depositing, on the layer or layers of the composition or compositions comprising compounds X, Y, the catalyst and the reflective particles with metallic reflection, at least one layer of a third composition comprising a physiologically acceptable medium and at least one film-forming polymer and at least one organic or aqueous solvent medium.

40. Cosmetic kit for the care and/or make-up of keratinous substance(s) comprising at least two compositions that are different and are packaged separately, the kit comprising at least some reflective particles with metallic reflection, at least one compound X, at least one compound Y, and optionally at least one catalyst, with at least one of compounds X and Y being a silicone compound, said compounds X and Y being capable of reacting together by a condensation reaction when they are brought into contact with one another, and in which compounds X, Y and the catalyst, when it is present, are not present simultaneously in the same composition.