Composition for caring for the skin

Abstract

Anhydrous composition for caring for the skin, in particular the scalp, comprising: (i) at least one linear alkane containing from 10 to 28 carbon atoms; (ii) at least one oil of formula R1COOR2, in which R1 represents a linear or branched fatty acid residue containing from 4 to 40 carbon atoms and R2 represents a hydrocarbon-based chain containing from 4 to 40 carbon atoms, with the proviso that R1+R2 > 16; and (iii) at least one plant oil of the triglyceride type. Also a non-therapeutic method for caring for the skin, in particular the scalp, comprising the application to the skin, in particular the scalp, of the composition.

Description

TECHNICAL FIELD

[0001] The present invention relates to a composition. In particular, the present invention relates to a composition for caring for the skin, in particular the scalp. The present invention also relates to a non-therapeutic method for caring for the skin, in particular the scalp. BACKGROUND

[0002] The skin constitutes the physical barrier between the body and its environment. It is composed of two tissues: the epidermis and the dermis.

[0003] The dermis provides solid support to the epidermis. It is also the nourishing element of the epidermis. The dermis is mainly composed of fibroblasts and of the extracellular matrix, which itself is mainly composed of collagen, elastin and of a substance called ground substance, these components being synthesized by fibroblasts. Leukocytes, mast cells or tissue macrophages are also found in the dermis. The dermis also contains blood vessels and nerve fibers.

[0004] The epidermis is a stratified, keratinized epithelium, with an average thickness of 100 pm, and it is usually divided into a basal layer of keratinocytes constituting the stratum germinativum of the epidermis, a stratum spinosum composed of several layers of polyhedral cells located on the stratum germinativum, a granular layer composed of flattened cells containing different cytoplasmic inclusions, transparent keratohyalin granules, and finally an upper layer called the stratum corneum (or horny layer) composed of keratinocytes at the end of their differentiation, called corneocytes. These are mummified anucleated cells derived from keratinocytes. The stack of these corneocytes constitutes the stratum corneum, which is particularly responsible for the barrier function of the epidermis, i.e. it constitutes a barrier against external attacks, in particular chemical, mechanical or infectious attacks, and it also makes it possible to protect the body from water loss.

[0005] To modify the appearance of the hair, many products have been developed to treat the hair during dyeing, bleaching, permanent waving and / or straightening.

[0006] During the application of products for dyeing, bleaching, permanent waving and / or straightening the hair, some ingredients will come into contact with the scalp and pass through the stratum corneum to reach the living epidermis, which can cause discomfort and irritation of the scalp.

[0007] There is therefore a need to formulate cosmetic compositions for caring for the skin, in particular the scalp, which can prevent water-soluble dyes and strongly alkaline ingredients from passing through the stratum corneum to reach the living epidermis. SUMMARY

[0009] It is an object of the present invention to provide a composition for caring for the skin, in particular the scalp, which can prevent water-soluble dyes and strongly alkaline ingredients from passing through the stratum corneum to reach the living epidermis.

[0010] Another object of the present invention is to provide a composition for skin care (especially scalp) that does not adversely affect the coloring and / or bleaching effect of coloring and / or bleaching products on hair.

[0011] Therefore, in a first aspect, the present invention relates to an anhydrous composition for skin care (especially scalp), comprising:

[0012] (i) at least one straight-chain alkane containing 10 to 28 carbon atoms;

[0013] (ii) at least one oil of the formula R1COOR2, wherein R1 represents a straight-chain or branched-chain fatty acid residue containing 4 to 40 carbon atoms and R2 represents a hydrocarbon-based chain containing 4 to 40 carbon atoms, provided that R1 + R2 ≥ 16; and

[0014] (iii) At least one type of triglyceride vegetable oil.

[0015] The compositions of the present invention may be in the form of oleogloss or oleosesquiter.

[0016] In a second aspect, the present invention relates to a non-therapeutic method for caring for the skin (especially the scalp), comprising applying a composition according to a first aspect of the invention to the skin (especially the scalp).

[0017] It has been found that the compositions according to the invention can prevent water-soluble dyes and strongly alkaline components from penetrating the stratum corneum to reach the living epidermis, and avoid scalp staining. Furthermore, the compositions according to the invention have no negative impact on the dyeing effect of dyeing compositions on hair or the bleaching effect of bleaching products on hair.

[0018] Other subjects, features, aspects, and advantages of the invention will become even clearer upon reading the following detailed description and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, wherein:

[0021] Figure 1 The fluorescence intensity in the stratum corneum when the staining composition was applied is shown, where 1 ( Figure 1 The pink portion in the image represents a water-soluble fluorescent dye, 2 ( Figure 1 The blue part represents keratinocytes and keratin, and 3 ( Figure 1 The green part in the image represents collagen.

[0022] Figure 2 The fluorescence intensity in the stratum corneum when the composition of Comparative Formulation 1 and the dyeing composition were applied is shown, where 1 ( Figure 2 The pink portion in the image represents a water-soluble fluorescent dye, 2 (Figure 2 The blue part represents keratinocytes and keratin, and 3 ( Figure 2 The green part in the image represents collagen.

[0023] Figure 3 The fluorescence intensity in the stratum corneum when the composition of formulation 2 of the invention and the dyeing composition are applied are shown, wherein 2 ( Figure 3 The blue part represents keratinocytes and keratin, and 3 ( Figure 3 The green part in the image represents collagen.

[0024] Figure 4 The fluorescence intensity in the stratum corneum when the composition of formulation 3 of the invention and the dyeing composition are applied are shown, wherein 1 ( Figure 4 The pink portion in the image represents a water-soluble fluorescent dye, 2 ( Figure 4 The blue part represents keratinocytes and keratin, and 3 ( Figure 4 The green part in the image represents collagen.

[0025] Figure 5 Showing A for different treatments The amount of (formazan), where “Ngc” represents the original cell viability, “alone” represents unprotected cell viability, “shawarzkopf” represents cell viability under the protection of the product from shawarzkopf, N5 represents cell viability under the protection of the composition of formulation 3, N8 represents cell viability under the protection of the composition of formulation 2, and N9 represents cell viability under the protection of the composition of formulation 1.

[0026] Figure 6 The images shown are photographs taken during the evaluation process, which involved dyeing pigskin.

[0027] Figure 7 The images shown are taken during the evaluation process using hair samples and model heads.

[0028] Figure 8 The images shown are taken during the evaluation process using hair samples. DETAILED DESCRIPTION

[0030] In the following text and unless otherwise indicated, the upper and lower limits of the numerical range are included within the range, especially in expressions such as “between … and …” and “ranging from … to …”.

[0031] Furthermore, the expression "at least one" as used in this specification is equivalent to the expression "one or more kinds of".

[0032] Throughout this application, the term "comprising / including" should be interpreted as encompassing all specifically mentioned features as well as optional, additional, or unspecified features. As used herein, the use of the term "comprising / including" also discloses embodiments in which features other than those specifically mentioned (i.e., "consisting of") are absent.

[0033] Unless otherwise specified, all numerical values ​​representing quantities of ingredients, etc., used in the specification and claims should be understood to be modified by the term "about". Therefore, unless indicated to the contrary, the numerical values ​​and parameters described herein are approximate and can be changed as needed for the desired purpose.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Where a definition of a term in this specification conflicts with the meaning commonly understood by one of ordinary skill in the art to which this invention pertains, the definition described herein shall prevail.

[0035] Unless otherwise defined, all percentages in this invention refer to weight percentages.

[0036] For the purposes of this invention, the term "anhydrous" means that the composition according to the invention contains less than 2% by weight, and preferably less than 0.5% by weight, of water relative to the total weight of the composition. Where appropriate, such a small amount of water may be provided by components of the composition that contain water in residual amounts, but this is not intentional. In particular, water is absent from the composition.

[0037] According to a first aspect, the present invention provides an anhydrous composition for skin care (especially scalp), comprising:

[0038] (i) at least one straight-chain alkane containing 10 to 28 carbon atoms;

[0039] (ii) at least one oil of the formula R1COOR2, wherein R1 represents a straight-chain or branched-chain fatty acid residue containing 4 to 40 carbon atoms and R2 represents a hydrocarbon-based chain containing 4 to 40 carbon atoms, provided that R1 + R2 ≥ 16; and

[0040] (iii) At least one type of triglyceride vegetable oil.

[0041] Straight-chain alkanes

[0042] According to a first aspect, the composition according to the invention comprises at least one straight-chain alkane containing 10 to 28 carbon atoms.

[0043] Examples of straight-chain alkanes suitable for use in the compositions of the present invention include n-decane (C10), n-undecane (C11), n-dodecane (C12), n-tridecane (C13), n-tetradecane (C14), n-pentadecanane (C15), n-hexadecane (C16), n-heptadecane (C17), n-octadecane (C18), n-nonadecanane (C19), n-eicosane (C20), n-unethosane (C21), n-unethosane (C22), n-tridecane (C23), n-tetracosane (C24), n-pentadecanane (C25), n-hexadecane (C26), n-heptadecane (C27), n-octadecane (C28), and mixtures thereof.

[0044] Preferably, the straight-chain alkane is selected from straight-chain C4+ alkane. 12 -C 24 Alkanes.

[0045] More preferably, the straight-chain alkane is selected from straight-chain C4+ alkane. 14 -C 22 Alkanes.

[0046] In some implementations, the straight-chain alkane used is a straight-chain C 15 -C 19 Alkanes.

[0047] As a commodity of straight-chain alkanes, it can be mentioned that SEPPIC uses the name EMOGREEN. TM L19 sold C 15-19 Alkanes.

[0048] Advantageously, the amount of straight-chain alkanes present relative to the total weight of the composition ranges from 0.1% to 10% by weight, preferably from 0.2% to 5% by weight, and more preferably from 0.5% to 3% by weight.

[0049] Oils of formula R1COOR2

[0050] According to a first aspect, the composition according to the invention comprises at least one oil of the formula R1COOR2.

[0051] In formula R1COOR2, R1 represents a straight-chain or branched-chain fatty acid residue containing 4 to 40 carbon atoms, and R2 represents a hydrocarbon-based chain containing 4 to 40 carbon atoms, provided that R1+R2≥16.

[0052] Examples of oils of formula R1COOR2 include purcellin oil (cetearyl caprylate), isononyl isononanoate, 2-ethylhexyl palmitate, octyl dodecyl neopentanoate, stearyl heptanoate, stearyl caprylate, 2-octyl dodecyl stearate, 2-octyl dodecyl erucic acid, oleyl erucic acid, isostearyl isostearate, 2-octyl dodecyl benzoate, octyl alcohol ester or octyl polyol ester, decyl alcohol ester or decyl polyol ester, or ricinoleic alcohol ester or ricinoleic polyol ester, isopropyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, 2-ethylhexyl palmitate, 2-hexyl decyl laurate, 2-octyl decyl palmitate, 2-octyl dodecyl myristate, or 2-diethylhexyl succinate.

[0053] Preferably, the oil of formula R1COOR2 is selected from C6-C. 24 Monocarboxylic acids and C4-C 20 An ester of an alcohol, wherein at least one of the acid and the alcohol is branched or unsaturated; more preferably selected from C. 12 -C 20 Monocarboxylic acids and C4-C 10 An ester of an alcohol, wherein at least one of the acid and the alcohol is branched or unsaturated.

[0054] Most notably, the oil in formula R1COOR2 is selected from:

[0055] -Myristic acid C4-C 10 Alkyl esters, especially isobutyl myristate, isohexyl myristate, 2-ethylhexyl myristate or isodecanyl myristate;

[0056] - Palmitic acid C4-C 10 Alkyl esters, especially isobutyl palmitate, isohexyl palmitate, 2-ethylhexyl palmitate or isodecanyl palmitate;

[0057] -Isostearic acid C4-C 10 Alkyl esters, especially isobutyl isostearate, isohexyl isostearate, 2-ethylhexyl isostearate, or isodecanyl isostearate, and

[0058] - Its mixture.

[0059] As a product of the oil of formula R1COOR2, it can be mentioned that it is produced by BASF under the name of 2-Ethylhexyl palmitate sold under C 24.

[0060] Advantageously, the amount of oil of formula R1COOR2 present relative to the total weight of the composition ranges from 0.1% to 10% by weight, preferably from 0.2% to 5% by weight, and more preferably from 0.5% to 3% by weight.

[0061] Vegetable oils of the triglyceride type

[0062] According to a first aspect, the composition according to the invention comprises at least one vegetable oil of the triglyceride type.

[0063] Preferably, the triglyceride-type vegetable oil is selected from sunflower seed oil, corn oil, soybean oil, gourd oil, grape seed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia nut oil, castor oil, olive oil; avocado oil; argan oil; camellia oil, palm oil, corn germ oil, cottonseed oil, peanut oil, pumpkin seed oil, wheat germ oil, babassu oil, coconut oil, rapeseed oil, almond oil, flaxseed oil, safflower oil, and mixtures thereof.

[0064] More preferably, the triglyceride-type vegetable oils are selected from sunflower seed oil, jojoba seed oil, arganiaspinosa kernel oil, coconut oil, corn oil, soybean oil, gourd oil, grape seed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia nut oil, castor oil, and avocado oil.

[0065] As commercial products of triglyceride-type vegetable oils, examples include sunflower (Helianthus annuus) seed oil sold by AAK KAMANIPRIVATE under the name REFINED SUNFLOWER OIL; simmondsia chinensis (jojoba) seed oil sold by JOJOBADESERT under the name JD FFL JOJOBA GOLDEN OIL; coconut (cocos nucifera) oil sold by BIOTROPICS under the name ACTIVATEDVIRGIN COCONUT OIL; argania spinosa kernel oil sold by BASF BEAUTY CARE SOLUTION under the name LIPOFRUCTYLARGAN BE LS 9779; and apricot (prunus armeniaca) kernel oil sold by GUSTAV HEESS under the name APRICOT KERNEL OIL REFINED DAC.

[0066] Advantageously, the amount of triglyceride-type vegetable oil present relative to the total weight of the composition ranges from 1% to 30% by weight, preferably from 3% to 20% by weight, and more preferably from 8% to 15% by weight.

[0067] Semi-crystalline or crystalline lipophilic thickeners

[0068] Preferably, the composition according to the invention comprises a semi-crystalline lipophilic thickener or a crystalline lipophilic thickener.

[0069] The term "lipophilic" here refers to the condition at room temperature (25°C) and atmospheric pressure (10). 5 At Pa), a substance soluble in oil at a concentration of at least 1% by weight relative to the total weight of oil.

[0070] The semi-crystalline lipophilic thickener or crystalline lipophilic thickener used in this invention may be selected from semi-crystalline polymers or crystalline polymers.

[0071] Semi-crystalline polymers or crystalline polymers are preferably semi-crystalline polymers. The term "semi-crystalline polymer" refers to a polymer comprising a crystallizable portion (crystallizable side chains and / or end chains or crystallizable blocks in and / or at the ends of the main chain) and an amorphous portion in the main chain, and having a first-order reversible phase transition (especially melting (solid-liquid transition)) temperature. When the crystallizable portion is in the form of crystallizable blocks in the polymer main chain, the amorphous portion of the polymer is in the form of amorphous blocks; in this case, the semi-crystalline polymer is a block copolymer, such as a diblock, triblock, or multiblock type block copolymer, which comprises at least one crystallizable block and at least one amorphous block. The term "block" generally refers to at least five identical repeating units. The crystallizable block then has different chemical properties than the amorphous block.

[0072] The semi-crystalline polymer according to the invention has a melting point of 30°C or higher (especially in the range of 30°C to 80°C), preferably in the range of 30°C to 60°C, and especially in the range of 40°C to 50°C. This melting point is a first-order phase change temperature.

[0073] The melting point can be measured by any known method, and in particular by using a differential scanning calorimeter (DSC) (such as the calorimeter sold by TA Instruments under the name DSC Q2000).

[0074] Advantageously, the semi-crystalline polymers to which this invention is applicable have a number-average molecular weight of 1000 or higher.

[0075] Advantageously, the number-average molecular weight of the semi-crystalline polymer in the compositions of the present invention ranges from 2,000 to 800,000, preferably from 3,000 to 500,000, still more preferably from 4,000 to 150,000, and especially less than 100,000, and still more preferably from 4,000 to 99,000. Preferably, its number-average molecular weight is greater than 5,600, for example, in the range of 5,700 to 99,000.

[0076] For the purposes of this invention, the expression "crystallizable chain or block" refers to a chain or block that, if obtained alone, reversibly transforms from an amorphous state to a crystalline state depending on whether the temperature is above or below the melting point. For the purposes of this invention, a "chain" is a group of atoms that hangs over or flanks the polymer backbone. A "block" is a group of atoms belonging to the backbone that constitutes one of the repeating units of the polymer. Advantageously, a "crystallizable side chain" can be a chain containing at least six carbon atoms.

[0077] Preferably, the crystallizable blocks or chains of the semi-crystalline polymer constitute at least 30% and more preferably at least 40% of the total weight of each polymer. The semi-crystalline polymers of the present invention containing crystallizable blocks are block polymers or multi-block polymers. They can be obtained by polymerization of monomers containing reactive double bonds (or olefinic bonds) or by polycondensation. When the polymers of the present invention are polymers containing crystallizable side chains, these side chains are advantageously in a random or statistical form.

[0078] Preferably, the semi-crystalline polymers that can be used in the compositions according to the invention have a synthetic source. Furthermore, they do not contain a polysaccharide backbone. Generally, the crystallizable units (chains or blocks) of the semi-crystalline polymers according to the invention are derived from monomers containing crystallizable blocks or chains used to manufacture the semi-crystalline polymer.

[0079] According to the present invention, the semi-crystalline polymer may be selected from block copolymers comprising at least one crystallizable block and at least one amorphous block, homopolymers and copolymers in which each repeating unit carries at least one crystallizable side chain, and mixtures thereof.

[0080] Semi-crystalline polymers that can be used in this invention include, in particular:

[0081] - Block copolymers of polyolefins with controlled crystallization, especially those whose monomers are described in EP-A-0951897.

[0082] - Condensation polymers, especially aliphatic or aromatic polyester type condensation polymers or aliphatic / aromatic copolyester type condensation polymers.

[0083] - Homopolymers or copolymers carrying at least one crystallizable side chain, and homopolymers or copolymers carrying at least one crystallizable block in the main chain, such as those described in document US-A-5156911.

[0084] - Homopolymers or copolymers carrying at least one crystallizable side chain (especially containing fluorine-containing groups), as described in document WO-A-01 / 19333.

[0085] - and its mixtures.

[0086] In the last two cases, the crystallizable side chains or blocks are hydrophobic.

[0087] (i) Semi-crystalline polymers containing crystallizable side chains

[0088] Those defined in documents US-A-5156911 and WO-A-01 / 19333 are particularly noteworthy. They are homopolymers or copolymers comprising 50% to 100% by weight of units produced by the polymerization of one or more monomers carrying crystallizable hydrophobic side chains.

[0089] These homopolymers or copolymers have any properties provided that they satisfy the conditions mentioned above.

[0090] They can be generated from:

[0091] - The polymerization (especially free radical polymerization) of one or more monomers containing a double bond (i.e., vinyl, (meth)acrylate, or allyl) that is reactive or olefinic in relation to polymerization.

[0092] - A polycondensation of one or more monomers (carboxylic acids, sulfonic acids, alcohols, amines or isocyanates) carrying co-reactive groups, such as polyesters, polyurethanes, polyethers, polyureas or polyamides.

[0093] Generally, these polymers are selected in particular from homopolymers and copolymers produced by the polymerization of at least one monomer containing a crystallizable chain, which can be represented by formula (I):

[0094]

[0095] Where M represents the atoms of the polymer backbone, S represents the spacer group, and C represents the crystallizable group.

[0096] The crystallizable chain "-SC" can be aliphatic or aromatic, and optionally fluorinated or perfluorinated. "S" specifically represents the group (CH2). n Or (CH2CH2O) n Or (CH2O), which can be straight-chain, branched, or cyclic, where n is an integer ranging from 0 to 22. Preferably, "S" is a straight-chain group. Preferably, "S" is different from "C".

[0097] When the crystallizable chain "-SC" is a hydrocarbon-based aliphatic chain, it comprises a hydrocarbon-based alkyl chain containing at least 11 carbon atoms and no more than 40 carbon atoms (and still more preferably no more than 24 carbon atoms). They are particularly aliphatic or alkyl chains having at least 12 carbon atoms, and they are preferably C16-264-3 ... 14 -C 24Alkyl chains. When they are fluoroalkyl or perfluoroalkyl chains, they contain at least six fluorinated carbon atoms, and more particularly at least 11 carbon atoms, of which at least six are fluorinated.

[0098] Examples of semi-crystalline polymers or copolymers carrying crystallizable chains include those produced by the polymerization of one or more monomers of the following: saturated alkyl (meth)acrylates, wherein the alkyl group is C10. 14 -C 24 ; has C 11 -C 15 Perfluoroalkyl (meth)acrylates; N-alkyl (meth)acrylamides, wherein the alkyl group is a C-terminal with or without a fluorine atom. 14 To C 24 Vinyl esters containing alkyl chains or perfluorinated (alkyl) chains, wherein the alkyl group is C10. 14 To C 24 (Each perfluoroalkyl chain contains at least 6 fluorine atoms); vinyl ethers containing alkyl chains or perfluoro(alkyl) chains, wherein the alkyl group is C10. 14 To C 24 And each perfluoroalkyl chain has at least 6 fluorine atoms; C 14 To C 24 α-olefins, such as octadecene; p-alkylstyrene having an alkyl group containing 12 to 24 carbon atoms; and mixtures thereof.

[0099] When a polymer undergoes self-condensation, the hydrocarbon-based crystallizable chains and / or fluorinated crystallizable chains, as defined above, are carried by monomers that can be diacids, glycols, diamines, or diisocyanates.

[0100] When the polymers that are the subject of this invention are copolymers, they additionally contain 0 to 50% of groups Y or Z, resulting in copolymers of the following:

[0101] α)Y, which is a polar or nonpolar monomer or a mixture of both:

[0102] When Y is a polar monomer, it is a monomer carrying a polyoxyalkylene group (especially an oxyethylene and / or oxypropylene group); a hydroxyalkyl methacrylate, such as hydroxyethyl acrylate; (meth)acrylamide, N-alkyl(meth)acrylamide, N,N-dialkyl(meth)acrylamide, such as N,N-diisopropylacrylamide or N-vinylpyrrolidone (NVP); N-vinylcaprolactam; a monomer carrying at least one carboxylic acid group, such as (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid or fumaric acid; or a monomer carrying a carboxylic anhydride group, such as maleic anhydride; and mixtures thereof.

[0103] When Y is a nonpolar monomer, it can be an ester of the (meth)acrylic acid type, such as a straight-chain, branched, or cyclic alkyl ester; a vinyl ester; an alkyl vinyl ether; an α-olefin; styrene; or a monomer formed from C1 to C2. 10 Alkyl-substituted styrene, such as α-methylstyrene.

[0104] For the purposes of this invention, unless otherwise specified, the term "alkyl" will specifically refer to C8 to C96. 30 saturated groups, and still better C 10 To C 30 saturated groups.

[0105] β)Z, which is a polar monomer or a mixture of polar monomers. In this case, Z has the same definition as "polar Y" as defined above.

[0106] Preferably, the semi-crystalline polymer containing crystallizable side chains is (meth)acrylic acid C8-C. 30 Alkyl ester (preferably (meth)acrylic acid C) 10 -C 30 Alkyl esters or C8-C 30 Alkyl (meth)acrylamide (preferably C) 10 -C 30 Homopolymers of alkyl (meth)acrylamide; copolymers of these monomers and preferably hydrophilic monomers with different properties of (meth)acrylic acid (e.g., N-vinylpyrrolidone or hydroxyethyl (meth)acrylate); and mixtures thereof.

[0107] (ii) A polymer carrying at least one crystallizable block in the main chain

[0108] These polymers are in particular block copolymers consisting of at least two blocks with different chemical properties, one of which is crystallizable.

[0109] - Block polymers as defined in patent US-A-5156911 may be used;

[0110] - Block copolymers containing crystallizable olefins or cyclic olefins, such as those derived from:

[0111] - Cyclobutene, cyclohexene, cyclooctene, norbornene (i.e., bicyclo(2.2.1)-2-heptene), 5-methylnorbornene, 5-ethylnorbornene, 5,6-dimethylnorbornene, 5,5,6-trimethylnorbornene, 5-ethylidenenorbornene, 5-phenylnorbornene, 5-benzylnorbornene, 5-vinylnorbornene, 1,4,5,8-dimethano-1,2,3,4,4a,5,8a-tetrahydronaphthalene, dicyclopentadiene, or mixtures thereof.

[0112] Those that are block polymerized with ethylene, propylene, 1-butene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene or 1-eicosene or mixtures thereof.

[0113] -And especially copolymers of (ethylene / norbornene) block copolymers and (ethylene / propylene / ethylene norbornene) block copolymers. It is also possible to use copolymers composed of at least two C2-C... 16 α-olefins, still better C2-C 12 α-olefins and even better C4-C 12 Those obtained by block copolymerization of α-olefins (such as those mentioned above), and especially block binary copolymers of ethylene and 1-octene.

[0114] - The copolymer may be a copolymer containing at least one crystallizable block, the remainder of which is amorphous (at room temperature). These copolymers may also contain two crystallizable blocks with different chemical properties. Preferred copolymers are those containing both crystallizable and amorphous blocks at room temperature, wherein the blocks are both hydrophobic and lipophilic, and are sequentially distributed; for example, polymers containing one of the following crystallizable blocks and one of the following amorphous blocks may be mentioned:

[0115] - Naturally crystallizable a) Polyester-type blocks, such as poly(alkyl terephthalate), and naturally crystallizable b) Polyolefin-type blocks, such as polyethylene or polypropylene;

[0116] - Amorphous and lipophilic blocks, such as amorphous polyolefins or copolymers (olefins), such as poly(isobutylene), hydrogenated polybutadiene, or hydrogenated poly(isoprene).

[0117] Examples of such copolymers containing crystallizable blocks and separate amorphous blocks include:

[0118] α) Poly(ε-caprolactone)-β-poly(butadiene) block copolymers, preferably in hydrogenated form, such as those described in S. Nojima's article "Melting behavior of poly(ε-caprolactone)-block-polybutadiene copolymers", Macromolecules, 32, 3727-3734 (1999).

[0119] The article “Study of morphological and mechanical properties of PP / PBT” by B. Boutevin et al., Polymer Bulletin, 34, 117-123 (1995), cites hydrogenated block or multiblock poly(butylene terephthalate)-b-poly(isoprene) block copolymers.

[0120] The poly(ethylene)-b-copolymer(ethylene / propylene) block copolymers cited in P. Rangarajan et al.'s article "Morphology of semi-crystalline block copolymers of ethylene-(ethylene-alt-propylene)", Macromolecules, 26, 4640-4645 (1993) and P. Richter et al.'s article "Polymer aggregates with crystalline cores: the system poly(ethylene)-poly(ethylene-propylene)", Macromolecules, 30, 1053-1068 (1997) are examples of such copolymers.

[0121] The poly(ethylene)-b-poly(ethylethylene) block copolymer mentioned in IWHamley's general article "Crystallization in block copolymers", Advances in Polymer Science, Vol. 148, 113-137 (1999).

[0122] The semi-crystalline polymers in the compositions of the present invention may be partially crosslinked or not partially crosslinked, provided that the degree of crosslinking does not prevent them from dissolving or dispersing in a liquid aliphatic phase optionally present in the composition by heating above their melting point. This can be a case of chemical crosslinking through reaction with polyfunctional monomers during polymerization. It can also be a case of physical crosslinking, which can be attributed to the formation of hydrogen bonds or dipole-type bonds between groups carried by the polymer, such as dipole interactions between carboxylic acid ester ionomers, which are minor and carried by the polymer backbone; or to phase separation between crystalline and amorphous blocks carried by the polymer.

[0123] Preferably, the semi-crystalline polymer of the composition according to the invention is uncrosslinked.

[0124] According to a particular embodiment of the invention, the polymer is selected from at least one monomer containing a crystallizable chain and at least one optionally fluorinated C1 to C2. 10 A copolymer produced by the polymerization of a monocarboxylic acid ester or amide, wherein the monomer containing a crystallizable chain is selected from saturated C46-methacrylic acid. 14 To C 24 Alkyl esters, (meth)acrylic acid C 11 To C 15 Perfluoroalkyl esters, C with or without fluorine atoms 14 To C 24 N-alkyl (methyl)acrylamide, containing C 14 To C 24 Vinyl esters with alkyl or perfluoroalkyl chains, containing C 14 To C 24 Vinyl ethers with alkyl or perfluoroalkyl chains, C 14 To C 24 α-olefins, p-alkylstyrene having an alkyl group containing 12 to 24 carbon atoms, the optionally fluorinated C1 to C2... 10 Monocarboxylic acid esters or amides can be represented by the following formula (II):

[0125]

[0126] Where R1 is H or CH3, and R represents an optionally fluorinated C1-C. 10 Alkyl group, where X represents O, NH, or NR2, and R2 represents optionally fluorinated C1-C. 10 alkyl.

[0127] According to a more particular embodiment of the invention, the polymer is derived from a monomer containing a crystallizable chain, said monomer being selected from (meth)acrylic acid saturated C 14 To C 22 Alkyl esters, and even more particularly poly(stearyl acrylate) or poly(succinate acrylate).

[0128] As a particular example of a structured semi-crystalline polymer that can be used in the compositions according to the invention, the INCI name “Polyacrylic Acid C” can be mentioned. 10- C 30 Alkyl ester (poly(acrylic acid C)) 10- C 30 Polymers of alkyl esters, such as those from Air Products. Products, such as products IPA 13-1 is a polystearic acid stearate with a melting point of 48°C, or a product. IPA 13-6 is a behenyl polymer.

[0129] Semi-crystalline polymers can be, in particular:

[0130] The examples described in Examples 3, 4, 5, 7, 9, and 13 of patent US-A-5156911 contain -COOH groups and are derived from acrylic acid and (meth)acrylic acid C5 to C6. 16 Copolymerization of alkyl esters, and especially copolymerization of the following:

[0131] • Acrylic acid, hexadecyl acrylate, and isodecyl acrylate in a weight ratio of 1 / 16 / 3.

[0132] • Acrylic acid and pentadecyl acrylate in a weight ratio of 1 / 19

[0133] • Acrylic acid, hexadecyl acrylate, and ethyl acrylate in a weight ratio of 2.5 / 76.5 / 20.

[0134] • Acrylic acid, hexadecyl acrylate, and methyl acrylate in a weight ratio of 5 / 85 / 10

[0135] • Acrylic acid and octadecyl methacrylate in a weight ratio of 2.5 / 97.5

[0136] • Hexadecyl acrylate in a weight ratio of 8.5 / 1 / 0.5, polyethylene glycol methacrylate monomethyl ether containing 8 ethylene glycol units, and acrylic acid.

[0137] It may also use the structure “O” from National Starch (as described in document US-A-5736125), which has a melting point of 44°C; and semi-crystalline polymers having crystallizable side chains containing fluorine groups, as described in Examples 1, 4, 6, 7 and 8 of document WO-A-01 / 19333.

[0138] It is also possible to use semi-crystalline polymers obtained by copolymerization of stearate acrylate with acrylic acid or NVP, as described in documents US-A-5519063 or EP-A-0550745, with melting points of 40°C and 38°C, respectively.

[0139] It is also possible to use semi-crystalline polymers obtained by copolymerizing benzyl acrylate with acrylic acid or NVP, as described in documents US-A-5519063 and EP-A-550745, with melting points of 60°C and 58°C, respectively.

[0140] Preferably, the semi-crystalline polymer does not contain any carboxyl groups.

[0141] Finally, the semi-crystalline polymers according to the present invention may also be selected from waxy polymers obtained by metallocene catalysis, such as those described in patent application US2007 / 0031361.

[0142] These polymers are homopolymers or copolymers of ethylene and / or propylene prepared via metallocene catalysis (i.e., by polymerization at low pressure and in the presence of a metallocene catalyst).

[0143] The waxes obtained via metallocene catalysis described in this literature have a weight-average molecular weight (Mw) of less than or equal to 25,000 g / mol, and range, for example, from 2,000 g / mol to 22,000 g / mol, and still more preferably from 4,000 g / mol to 20,000 g / mol.

[0144] The number-average molecular weight (Mn) of the waxes obtained by metallocene catalysis as described in this document is preferably less than or equal to 15,000 g / mol, and ranges, for example, from 1,000 g / mol to 12,000 g / mol, and still more preferably from 2,000 g / mol to 10,000 g / mol.

[0145] The polydispersity index I of a polymer is equal to the ratio of its weight-average molecular weight Mw to its number-average molecular weight Mn. Preferably, the polydispersity index of the waxy polymer is between 1.5 and 10, more preferably between 1.5 and 5, even or preferably between 1.5 and 3, and still more preferably between 2 and 2.5.

[0146] Waxy homopolymers and copolymers can be obtained from ethylene and / or propylene monomers in a known manner, for example via metallocene catalysis according to the method described in document EP 571882.

[0147] Homopolymers and copolymers of ethylene and / or propylene prepared via metallocene catalysis can be unmodified or “polar” modified (polar-modified waxes, i.e., waxes modified to possess the properties of polar waxes). Polar-modified waxy homopolymers and copolymers can be prepared in known ways from unmodified waxy homopolymers and copolymers (such as those described above) by oxidation with an oxygen-containing gas (e.g., air) or by grafting with polar monomers (e.g., maleic acid or acrylic acid or derivatives of these acids). These two routes enabling the polar modification of polyolefins obtained via metallocene catalysis are described, for example, in documents EP 890583 and US 5998547, the contents of which are incorporated herein by reference.

[0148] According to the present invention, particularly preferred polar-modified homopolymers and copolymers of ethylene and / or propylene prepared via metallocene catalysis are polymers modified to possess hydrophilic properties. Examples that may be mentioned include ethylene and / or propylene homopolymers or copolymers modified by the presence of hydrophilic groups such as maleic anhydride, acrylates, methacrylates, and polyvinylpyrrolidone (PVP).

[0149] Waxy ethylene and / or propylene homopolymers or copolymers modified with the presence of hydrophilic groups such as maleic anhydride or acrylate are particularly preferred.

[0150] Examples that may be mentioned include:

[0151] - Maleic anhydride-modified polypropylene wax (PPMA) sold by Clariant; or polypropylene-ethylene-maleic anhydride copolymers, such as those sold by Clariant under the name LikeCare (e.g., LikeCare PP207 LP3349, LikeCare CM401 LP3345, LikeCare CA301 LP3346, and LikeCare CA302 LP3347).

[0152] - Unmodified polyethylene waxes sold by Clariant, such as product LikeCare PE 102LP3329.

[0153] Advantageously, the amount of the lipophilic thickener present relative to the total weight of the composition ranges from 0.1% to 10% by weight, preferably from 0.2% to 8% by weight, and more preferably from 0.5% to 5% by weight.

[0154] Additional oils

[0155] The compositions according to the invention may further comprise one or more additional oils besides those described above.

[0156] Additional oils can be non-volatile oils and / or volatile oils.

[0157] The oil can be silicone oil, fluorinated oil, hydrocarbon-based oil, or a mixture thereof.

[0158] The term "fluorinated oil" refers to an oil that contains at least one fluorine atom.

[0159] The oil may optionally contain oxygen, nitrogen, sulfur and / or phosphorus atoms, for example in the form of hydroxyl or acid groups.

[0160] Silicone oils and fluorinated oils can be selected from polar oils, non-polar oils, or mixtures thereof.

[0161] The "hydrocarbon-based oil" used as an additional oil can be a polar oil.

[0162] For the purposes of this invention, the term "polar oil" indicates that its oil solubility parameter δa at 25°C is not 0 (J / cm). 3 ) 1 / 2 .

[0163] According to a preferred embodiment, the composition according to the invention comprises at least one additional oil, such as squalane.

[0164] Advantageously, the total amount of all oils present in the composition ranges from 60% by weight to 99.5% by weight relative to the total weight of the composition of the invention.

[0165] Additional adjuvants or additives

[0166] The compositions of the present invention may contain conventional cosmetic adjuvants or additives, such as fragrances, chelating agents (e.g., disodium EDTA), preservatives (e.g., chlorphenesin and phenoxyethanol), bactericides, fillers, pH adjusters (e.g., citric acid, sodium hydroxide, potassium hydroxide), and mixtures thereof.

[0167] Those skilled in the art can select the amount of additional adjuvants or additives so as not to adversely affect the final use of the composition according to the invention.

[0168] According to a particularly preferred embodiment, the present invention provides an anhydrous composition for skin care (especially scalp), comprising, by weight of the composition:

[0169] (i) 0.5% to 3% by weight of at least one linear C 15 -C 19 Alkanes;

[0170] (ii) 0.5% to 3% by weight of at least one palmitic acid C4-C 10 Alkyl esters;

[0171] (iii) 8% to 15% by weight of at least one type of triglyceride vegetable oil selected from sunflower seed oil, jojoba seed oil, argania spinosa kernel oil, coconut oil, corn oil, soybean oil, cucurbita oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia nut oil, castor oil, and avocado oil; and

[0172] (iv) 0.5% to 5% by weight of at least one poly(C10-C30 alkyl acrylate).

[0173] Galénical forms and uses

[0174] The compositions of the present invention may be in the form of oleogloss or oleosesquiter.

[0175] The viscosity of the compositions according to the invention can be measured at 25°C using a ProRheo R180 viscometer equipped with a rotating shaft M2 or M3 that rotates at 200 rpm.

[0176] According to a preferred embodiment, the composition of the present invention has a viscosity of 10 UD (tolerance unit) to 80 UD, preferably 10 UD to 50 UD, as measured at 25°C using a ProRheoR180 viscometer equipped with a rotating shaft M2 that rotates at 200 rpm.

[0177] According to a second aspect, the present invention relates to a non-therapeutic method for caring for the skin (especially the scalp), comprising applying a composition according to a first aspect of the invention to the skin (especially the scalp).

[0178] The compositions according to the invention can prevent water-soluble dyes and strongly alkaline components from penetrating the stratum corneum and reaching the living epidermis.

[0179] Furthermore, the composition according to the present invention has no negative impact on the dyeing effect of the dyeing composition on hair.

[0180] Furthermore, the composition according to the invention has no negative impact on the bleaching effect of the bleaching product on hair.

[0181] The following examples are used to illustrate the invention, but are not limiting in nature. Example

[0182] The main raw materials used, their trade names, and suppliers are listed in Table 1.

[0183] Table 1

[0184]

[0185] Example 1 : Preparation of the composition

[0186] Prepare the compositions according to Comparative Formulation 1 and Inventive Formulations 1-3 according to the contents given in Table 2 (unless otherwise specified, the contents are expressed as a weight percentage of the active material relative to the total weight of each composition).

[0187] Table 2

[0188]

[0189] Preparation method:

[0190] Taking the composition of Formula 1 of the invention as an example, the preparation of the composition listed above is as follows:

[0191] 1) Combine ethylhexyl palmitate, sunflower seed oil (Helianthus annuus), jojoba seed oil (Simontia chinensis), argania spinosa kernel oil, apricot kernel oil (Prunus sarmeniaca), coconut oil (Cocos nucifera), and polyacrylic acid C. 10-30 Alkyl esters are mixed to obtain a mixture, which is then heated to 50°C and homogenized by stirring.

[0192] 2) Add C to the mixture 15-19 Alkanes and squalane, the mixture was cooled to room temperature by stirring; and

[0193] 3) Add tocopherol to the mixture to obtain the composition.

[0194] Example 2: Evaluation of the composition

[0195] Observe the appearance of each composition prepared in Example 1.

[0196] The viscosity, protective ability, and effect on dyeing and bleaching of each composition prepared in Example 1 were characterized.

[0197] Viscosity

[0198] Viscosity was measured at 25°C using a Rheomat R180 viscometer equipped with an M3 or M2 spindle, at a shear rate of 200 rpm, after the spindle had been rotating in the composition for 10 minutes (after which stabilization of viscosity and spindle rotation speed was observed).

[0199] The appearance and viscosity are summarized in Table 3.

[0200] Table 3

[0201] Properties Inv. 1 Inv. 2 Inv. 3 Comp. 1 Viscosity (UD) 26.8(M3) 30.5(M2) 8.9(M2) 25(M3) Appearance Yellow balm Yellow oil gel Yellow liquid oil White cream

[0202] Protective power

[0203] i) Evaluation by confocal microscopy

[0204] The in vitro protective functions of the compositions of Invention Formulations 2-3 and the composition of Comparative Formulation 1 were evaluated using confocal laser scanning microscopy as follows:

[0205] 1) Clean and dry the pigskin purchased from the market;

[0206] 2) At 30 μl / cm 2 Apply the tested composition to the skin;

[0207] 3) Prepare the dyeing composition as the stimulating composition according to the contents given in Table 4 (unless otherwise specified, the contents are expressed as a weight percentage of the active material relative to the total weight of each composition);

[0208] Table 4

[0209]

[0210] 4) At 75 μl / cm 2 Apply the irritant sample to the skin for 40 minutes;

[0211] 5) Wipe it off with a paper towel;

[0212] 6) Select the central region and freeze the resulting slice;

[0213] 7) Image using a microscope.

[0214] Figure 1 The fluorescence intensity in the stratum corneum is shown when the dyeing composition is applied directly to pig skin.

[0215] from Figure 1 It is evident that the dye in the dyeing composition can penetrate the stratum corneum and reach the living epidermis, which may cause discomfort and irritation.

[0216] Figure 2 The fluorescence intensity in the stratum corneum is shown when the composition of Comparative Formulation 1 and the dyeing composition are applied.

[0217] Figure 3 The fluorescence intensity in the stratum corneum is shown when the composition of Formula 2 of the invention and the dyeing composition are applied.

[0218] Figure 4 The fluorescence intensity in the stratum corneum is shown when the composition of Formula 3 of the invention and the dyeing composition are applied.

[0219] from Figures 2-4It is evident that, compared to the composition of Comparative Formulation 1, the compositions of Invention Formulations 2-3 can effectively prevent dye from penetrating into the skin. Furthermore, the composition of Invention Formulation 2 is even more effective in preventing dye from penetrating into the skin.

[0220] ii) by Episkin TM Evaluation was performed

[0221] via EpiSkin TM The in vitro protective function of the compositions of formulations 1-3 and the pre-colored protective oil from Schwarzkopf was evaluated as follows.

[0222] Model:

[0223] Using EpiSkin TM Reconstructed skin model.

[0224] EpiSkin TM Tissues and culture media were purchased from Shanghai EpiSkin Biotechnology Co., Ltd. TM The tissue size is 1.07cm. 2 .

[0225] Against bleaching products:

[0226] The test composition (30 μl) was topically applied to the epidermal model (two epidermal units per test group). Subsequently, a mixture of 75 μl of hair bleaching powder (L'orealprofessional blond studio 8 from L'oreal) and a developer (L'oreal professional oxidant cream from L'oreal) at a 1:1.5 volume ratio was topically applied to the epidermal model (applied at room temperature with a nylon mesh for 45 minutes). Exposure was terminated by rinsing with phosphate-buffered saline (PBS).

[0227] Against colouring products:

[0228] The test composition (30 μl) was topically applied to the epidermal model (two epidermal units were used for each test group). Subsequently, 75 μl of a mixture of colorant (dye-free L'orealprofessional Maji fashion colorant 12.11 from L'oreal) and developer (L'orealprofessional oxidant cream from L'oreal) mixed in a 1:1.5 volume ratio was topically applied to the epidermal model (applied at room temperature with a nylon mesh for 45 minutes). Exposure was terminated by rinsing with phosphate-buffered saline (PBS).

[0229] Post-incubation: The epidermis is then incubated at 37°C for 18 hours.

[0230] Viability was assessed by incubating the tissue with MTT solution for 3 hours. The precipitated formaldehyde was then extracted with acidified isopropanol at 4°C. (formazan) 2 days, and quantification was performed by spectrophotometry at 570 nm using a 96-well plate.

[0231] Untreated epidermis (bleached and stained alone) and untreated epidermis were used as positive and negative controls, respectively.

[0232] Figure 5 Showing A for different treatments The amounts of Ngc, ...

[0233] from Figure 5 It is evident that the compositions of formulations 1-3 can effectively prevent chemicals (such as ammonium hydroxide and ethanolamine) from penetrating the skin and irritating the scalp.

[0234] iii) Evaluation by dyeing on pig skin

[0235] The in vitro protective function of the composition of Inventive Formulation 1 and the composition of Comparative Formulation 1 was evaluated by staining pigskin.

[0236] Figure 6 The images shown are from the evaluation process conducted by dyeing pigskin.

[0237] like Figure 6 The evaluation methods illustrated in the examples include:

[0238] 1) Prepare 4cm 2 The pigskin was first washed with standard DOP shampoo (from L'Oreal), and then dried.

[0239] 2) At 30 μl / cm 2 The tested composition was applied to pigskin;

[0240] 3) At 75 μl / cm 2 Apply the dyeing composition (a mixture of L'oreal's Majifashion color NO.1 and L'oreal's Developer 30, mixed in a 1:2 volume ratio) for 30 minutes;

[0241] 4) Rinse with DOP (standard shampoo).

[0242] Figure 6 The photographs shown are taken during the evaluation process by staining on pigskin, where “w / o protection” indicates that the tested composition was not applied, “w / scalp shield” indicates that the composition of Inventive Formulation 1 was applied, and “w / LP still cap” indicates that the composition of Comparative Formulation 1 was applied.

[0243] from Figure 6 It is evident that, compared to the composition of Comparative Formulation 1, the composition of Inventive Formulation 1 can effectively prevent dye from penetrating into the skin.

[0244] Effect on the dyeing power of the dyeing products on the hair

[0245] The effect of the composition of Invention Formulation 1 on the dyeing effect of the dyeing product on hair was evaluated using hair samples (hair type: natural Chinese hair) and model heads.

[0246] Figure 7 The images shown are taken during the evaluation process using hair samples and model heads.

[0247] like Figure 7 The evaluation methods illustrated in the examples include:

[0248] 1) Shampoo twice with DOP (standard shampoo, 12 grams of shampoo for each intact head in each test);

[0249] 2) Apply 7.5 grams of the test composition to one half of the head and massage the right half of the head for 1 minute;

[0250] 3) Apply the dyeing product (150 grams, a mixture of L'oreal's Maji 12.11 and L'oreal's Developer 30 in a 1:2 volume ratio) to the entire head;

[0251] 4) Wash the entire head with DOP and observe the color difference between the left and right sides.

[0252] from Figure 7 As can be seen, there is no obvious color difference between the left and right sides of the head, which indicates that the composition according to the present invention has no negative impact on the dyeing effect of the dyeing product on the hair.

[0253] Effect on the bleaching power of the bleaching products on the hair

[0254] The effect of the composition of Invention Formula 1 on the bleaching effect of the bleaching product on hair was evaluated using hair samples (hair type: natural Chinese hair).

[0255] Figure 8 The images shown are from the evaluation process using hair samples.

[0256] like Figure 8 The evaluation methods illustrated in the examples include:

[0257] 1) Select the same three hair samples (No.1, No.2, and No.3) and keep hair sample No.1 unprocessed;

[0258] 2) First, the test composition was applied to hair sample No. 2 (0.15 g of test composition per gram of hair sample No. 2). Then, a mixture of hair bleaching powder (L'orealprofessional blond studio 8 from L'oreal) and developer (L'oreal professional oxidant cream from L'oreal) mixed at a volume ratio of 1:1.5 was applied to hair sample No. 2 for 45 minutes (10 g of mixture per gram of hair sample No. 2).

[0259] 3) Apply the same mixture of bleaching powder and developer to hair sample No. 3 for 45 minutes (10 grams of mixture per gram of hair sample No. 3);

[0260] 4) Compare the colors of hair sample No. 2 and hair sample No. 3.

[0261] from Figure 8 As can be seen, there is no obvious color difference between hair sample No. 2 and hair sample No. 3, which indicates that the composition according to the present invention has no negative impact on the bleaching effect of the bleaching product on hair.

Claims

1. An anhydrous composition for skin care, comprising: (i) at least one linear C 15 -C 19 Alkanes; (ii) 3% to 10% by weight of palmitic acid branched C4-C 10 Alkyl esters selected from isobutyl palmitate, isohexyl palmitate, 2-ethylhexyl palmitate, isodecanyl palmitate, and mixtures thereof; and (iii) 8% to 15% by weight of at least one type of triglyceride vegetable oil selected from sunflower seed oil, jojoba seed oil, argania spinosa kernel oil, coconut oil, corn oil, soybean oil, cucurbita oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia nut oil, castor oil, and avocado oil. The total amount of all oils present in the composition ranges from 60% by weight to 99.5% by weight. All quantities are relative to the total weight of the composition.

2. The composition according to claim 1, further comprising a semi-crystalline lipophilic thickener or a crystalline lipophilic thickener.

3. The composition according to claim 2, wherein the lipophilic thickener is selected from (meth)acrylic acid C8-C. 30 Alkyl esters or C8-C 30 Homopolymers of alkyl (meth)acrylamides; C8-C (meth)acrylic acid 30 Alkyl esters or C8-C 30 Copolymers of alkyl (meth)acrylamide and hydrophilic monomers with different properties from (meth)acrylic acid; and mixtures thereof.

4. The composition according to claim 2 or 3, wherein the lipophilic thickener is present in an amount ranging from 0.1% by weight to 10% by weight relative to the total weight of the composition.

5. The cosmetic composition according to claim 1, comprising, relative to the total weight of the composition: (i) at least one linear C 15 -C 19 Alkanes; (ii) 3% to 10% by weight of at least one palmitic acid branched C4-C 10 Alkyl esters; (iii) 8% to 15% by weight of at least one type of triglyceride vegetable oil selected from sunflower seed oil, jojoba seed oil, argania spinosa kernel oil, coconut oil, corn oil, soybean oil, cucurbita oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia nut oil, castor oil, and avocado oil; and (iv) 0.5% to 5% by weight of at least one poly(acrylic acid C) 10 -C 30 Alkyl esters).

6. Use of the composition according to any one of claims 1 to 5 in the preparation of a cosmetic for skin care.

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