Patent Application
20240189200
The present invention relates to a process for the cosmetic treatment of braided hair, using a composition comprising in a hydro-alcoholic medium, a thickening polymer, a derivative of menthol and a particular non-ionic surfactant.
In some countries, water is rare and it is not possible to wash or shampoo hair as often as wanted. Compositions for cleansing and/or refreshing the scalp and hair have been proposed to consumers, to avoid discomfort and greasy aspect in the period between two shampoos.
In the case of braided hair, it is more complicated to clean and refresh hair, without disrupting the style of braided hair.
One purpose of the present invention is to propose a process for the cosmetic treatment of braided hair, that when applied will give immediate clean and fresh feeling and/or aspect to hair, in particular but not only relief of scratching, tingling and discomfort and will impart a pleasant soothing sensation on scalp, together with a surprising moisturizing effect of hair, while preserving the style of braided hair. Another purpose of the invention is to improve the softness of braided hair.
The Applicant has now discovered that the use of a composition comprising in a hydro-alcoholic medium a thickening polymer, a derivative of menthol and a particular non-ionic surfactant, makes it possible to achieve the objectives outlined above.
Thus, the subject of the invention is a process for the cosmetic treatment of braided hair, comprising a step of applying on said braided hair a cosmetic composition comprising:
It was observed that, surprisingly, the composition used in the present process can improve the softness of braided hair and leads to softened braids.
Advantageously, the composition used in the present invention easily flows to cleanse scalp and hair; it removes odors and dirt from scalp and braided hair, and conducts after application to a fresh and clean sensation on scalp and on braided hair.
The composition does not disrupt the style of braided hair; it shall confer good styling properties, such as a good manageability, to the hair.
Preferably, the composition according to the present invention can be used as a cleansing agent.
It preferably aims at a leave-on application on braided hair; and as the composition after its application on hair, does not need to be rinsed, the process does not require consumption of water and therefore could be considered as a waterless process or a waterless routine for braided hair. Preferably, there is no rinsing step after application of the composition, for example no rinsing step in the 1 hour following the application, preferably in the 2 hours, more preferably in the 12 hours, most preferably in the 24 hours following the application.
In particular, it is a process for improving moisturization and/or softness of braided hair advantageously while preserving the style of braided hair; more particularly, it is a waterless process for improving moisturization and/or softness of braided hair, while preserving the style of braided hair.
Other subjects, characteristics, aspects and advantages of the invention will emerge even more clearly on reading the description and the example that follows.
In that which follows and unless otherwise indicated, the limits of a range of values are included within this range, in particular in the expressions “of between” and “ranging from . . . to . . . ”.
Moreover, the expression “at least one” used in the present description is equivalent to the expression “one or more”.
According to the present invention, the term “braided hair” encompasses natural hair that have been braided.
It also encompasses the style achieved from the process of attaching synthetic fibers to one's natural hair. During this braiding process, synthetic fibers could be weaved together with natural hair to form a two- or three-way braid. Several strands of natural hair could be used to secure each braid. To braid securely, synthetic hair could be bent in half in order to create two sections of the braid entity, a person's own hair then forms the third part of the braid. Braids can also be two-way twists where the natural is wrapped around the synthetic fiber. The synthetic fibers used in protective hairstyles are preferably composed of acrylate polymer-fused with dyes. Other protective styles can be described as plaiting, sewn-in weaves, glue-in weaves and cornrows. Protective hairstyles are usually worn for several weeks and hair is generally washed less frequently.
The composition used according to the present invention comprises one or more thickening polymer(s).
The term “thickening polymer” means, according to the present invention, a polymer capable, by its presence, of increasing the viscosity of the medium by at least 50 centipoises at 25° C. and at a shear rate of 1 s−1. Preferably, the solution obtained by dissolving the thickening polymer at 1% by weight in water or in a 50/50 by weight water/alcohol mixture exhibits a viscosity at 25° C. and at a shear rate of 1 s−1 which is greater than 100 centipoises. These viscosities can be measured using in particular a viscometer or a rheometer having cone-plate geometry.
Preferably, the thickening polymer(s) are chosen from the thickening polymers comprising acrylic and/or methacrylic units.
The term “polymer comprising acrylic and/or methacrylic units” means, within the meaning of the present invention, a polymer resulting from the polymerization of one or more monomers including one or more monomers of structure:
As suitable thickening polymers, we can mention:
These non-ionic amphiphilic polymers can preferably be chosen from:
Anionic amphiphilic polymers of this type are, for example, described and prepared according to U.S. Pat. Nos. 3,915,921 and 4,509,949.
The anionic amphiphilic polymers which can be used in the present invention can more particularly denote polymers formed from a mixture of monomers comprising:
The said crosslinking agent is for example a monomer comprising a group
with at least one other polymerizable group, the unsaturated bonds of which are non-conjugated with respect to one another. Mention may in particular be made of polyallyl ethers, such as, in particular, polyallyl sucrose and polyallyl pentaerythritol.
Among the said polymers above, preference is given, according to the present invention, to the products sold by Goodrich under the trade names Pemulen TR1, Pemulen TR2 and Carbopol 1382, and more preferably still Pemulen TR1, and to the product sold by S.E.P.C. under the name Coatex SX.
Mention may also be made, as anionic amphiphilic polymers having fatty chains, of the copolymer of methacrylic acid, methyl acrylate and dimethyl-meta-isopropenylbenzyl isocyanate of ethoxylated alcohol sold under the name Viscophobe DB 1000 by Amerchol.
Mention may be made, as other anionic amphiphilic polymers having fatty chains, of those comprising at least one acrylic monomer having sulfonic group(s), in free or partially or completely neutralized form, and comprising at least one hydrophobic portion.
The hydrophobic portion present in the polymers of the invention preferably comprises from 8 to 22 carbon atoms, more preferably still from 8 to 18 carbon atoms and more particularly from 12 to 18 carbon atoms.
Preferably, the sulfonic polymers in accordance with the invention are partially or completely neutralized by an inorganic base (sodium hydroxide, potassium hydroxide or aqueous ammonia) or an organic base, such as mono-, di- or triethanolamine, an aminomethylpropanediol, N-methylglucamine, basic amino acids, such as arginine and lysine, and mixtures of these compounds.
The sulfonic amphiphilic polymers in accordance with the present invention generally have a number-average molecular weight ranging from 1000 to 20 000 000 g/mol, preferably ranging from 20 000 to 5 000 000 g/mol and more preferably still ranging from 100 000 to 1 500 000 g/mol.
The sulfonic amphiphilic polymers according to the invention may or may not be cross-linked. Crosslinked amphiphilic polymers are preferably chosen.
When they are cross-linked, the crosslinking agents can be chosen from polyolefinically unsaturated compounds commonly used for the crosslinking of polymers obtained by radical polymerization. Mention may be made, for example, of divinylbenzene, diallyl ether, dipropylene glycol diallyl ether, polyglycol diallyl ethers, triethylene glycol divinyl ether, hydroquinone diallyl ether, ethylene glycol di(meth)acrylate or tetraethylene glycol di(meth)acrylate, trimethylolpropane triacrylate, methylenebisacrylamide, methylenebismethacrylamide, triallylamine, triallyl cyanurate, diallyl maleate, tetraallylethylenediamine, tetraallyloxyethane, trimethylolpropane diallyl ether, allyl (meth)acrylate, allyl ethers of alcohols of the sugar series, or other allyl or vinyl ethers of polyfunctional alcohols, and also allyl esters of phosphoric and/or vinylphosphonic acid derivatives, or mixtures of these compounds.
Methylenebisacrylamide, allyl methacrylate or trimethylolpropane triacrylate (TMPTA) will more particularly be used. The degree of crosslinking will generally vary from 0.01 mol % to 10 mol % and more particularly from 0.2 mol % to 2 mol %, with respect to the polymer.
The acrylic monomers having sulfonic group(s) are chosen in particular from (meth)acrylamido(C1-C22)alkylsulfonic acids and N—(C1-C22)alkyl(meth)acrylamido(C1-C22)alkylsulfonic acids, such as undecylacrylamidomethanesulfonic acid, and also their partially or completely neutralized forms.
More preferably, use will be made of (meth)acrylamido(C1-C22)alkylsulfonic acids, such as, for example, acrylamidomethanesulfonic acid, acrylamidoethanesulfonic acid, acrylamidopropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, methacrylamido-2-methylpropanesulfonic acid, 2-acrylamido-n-butanesulfonic acid, 2-acrylamido-2,4,4-trimethylpentanesulfonic acid, 2-methacrylamidododecylsulfonic acid or 2-acrylamido-2,6-dimethyl-3-heptanesulfonic acid, and also their partially or completely neutralized forms.
More particularly, use can be made of 2-acrylamido-2-methylpropanesulfonic acid (AMPS®), and also its partially or completely neutralized forms.
The amphiphilic polymers in accordance with the invention can in particular be chosen from random amphiphilic AMPS® polymers modified by reaction with an n-mono(C6-C22)alkylamine or a di[n-(C6-C22)alkyl]amine, such as those described in Patent Application WO 00/31154; the polymers described in this patent application form part of the content of the present description. These polymers can also comprise other ethylenically unsaturated hydrophilic monomers chosen, for example, from (meth)acrylic acids, their β-substituted alkyl derivatives or their esters obtained with monoalcohols or mono- or polyalkylene glycols, (meth)acrylamides, vinylpyrrolidone, maleic anhydride, itaconic acid or maleic acid, or mixtures of these compounds.
The polymers of the invention can be chosen from amphiphilic copolymers of AMPS® and of at least one ethylenically unsaturated hydrophobic monomer comprising at least one hydrophobic portion having from 8 to 50 carbon atoms, more preferably from 8 to 22 carbon atoms, more preferably still from 8 to 18 carbon atoms and more particularly from 12 to 18 carbon atoms.
These same copolymers can additionally comprise one or more ethylenically unsaturated monomers not comprising a fatty chain, such as (meth)acrylic acids, their β-substituted alkyl derivatives or their esters obtained with monoalcohols or mono- or polyalkylene glycols, (meth)acrylamides, vinylpyrrolidone, maleic anhydride, itaconic acid or maleic acid, or mixtures of these compounds.
These copolymers are described in particular in Patent Application EP-A-750 899, in U.S. Pat. No. 5,089,578 and in the following Yotaro Morishima publications:
The ethylenically unsaturated hydrophobic monomers of these specific copolymers are preferably chosen from the acrylates or acrylamides of following formula (VI):
in which, R8 and R10, which are identical or different, denote a hydrogen atom or a linear or branched C1-C6 alkyl radical (preferably methyl); Y denotes O or NH; R9 denotes a hydrophobic hydrocarbon radical comprising at least from 8 to 50 carbon atoms, more preferably from 8 to 22 carbon atoms, more preferably still from 6 to 18 carbon atoms and more particularly from 12 to 18 carbon atoms; and x denotes a number of moles of alkylene oxide and varies from 0 to 100.
The R9 radical is preferably chosen from linear C6-C18 (for example n-hexyl, n-octyl, n-decyl, n-hexadecyl or n-dodecyl) alkyl radicals or branched or cyclic (for example cyclododecane (C12) or adamantane (C10)) alkyl radicals; C6-C18 perfluoroalkyl radicals (for example the group of formula —(CH2)2—(CF2)9—CF3); the cholesteryl (C27) radical or a cholesterol ester residue, such as the cholesteryl oxyhexanoate group; or polycyclic aromatic groups, such as naphthalene or pyrene. Preference is more particularly given, among these radicals, to linear alkyl radicals and more particularly to the n-dodecyl radical.
According to a particularly preferred form of the invention, the monomer of formula (VI) comprises at least one alkylene oxide unit (x≥1) and preferably a polyoxyalkylene chain. The polyoxyalkylene chain preferably consists of ethylene oxide units and/or of propylene oxide units and more particularly still consists of ethylene oxide units. The number of oxyalkylene units generally varies from 3 to 100, more preferably from 3 to 50 and more preferably still from 7 to 25.
Mention may be made, among these polymers, of:
Mention may also be made of copolymers of completely neutralized AMPS® and of dodecyl methacrylate, and also non-cross-linked and cross-linked copolymers of AMPS® and of n-dodecylmethacrylamide, such as those described in the above-mentioned papers by Morishima.
Mention will more particularly be made of the copolymers constituted of 2-acrylamido-2-methylpropanesulfonic acid (AMPS®) units of following formula (VII):
in which, X+ is a proton, an alkali metal cation, an alkaline earth metal cation or the ammonium ion,
and of units of following formula (VIII):
in which, X+ denotes an integer varying from 3 to 100, preferably from 5 to 80 and more preferably from 7 to 25, R11 has the same meaning as that indicated above for R8 in the formula (VI) and R12 denotes a linear or branched C6-C22 and more preferably C10-C22 alkyl.
The polymers particularly preferred are those for which x=25, R11 denotes methyl and R12 represents n-dodecyl.
The polymers for which X+ denotes sodium or ammonium are more particularly preferred.
These are water-soluble or water-swellable polymers.
The crosslinking units having at least two olefinic double bonds are more particularly still chosen from those corresponding to the following general formula (X):
Preferably, the thickening polymer(s) is/are chosen from cross-linked (meth)acrylic acid homopolymers, preferably cross-linked by an allyl ether of an alcohol of the sugar series; and/or cross-linked copolymers of (meth)acrylic acid and of (C1-C6)alkyl acrylate; preferably cross-linked copolymers of (meth)acrylic acid and of ethyl acrylate.
The total amount of thickening polymer(s) present in the composition according to the present invention preferably ranges from 0.01 to 5% by weight, more preferably from 0.02 to 1% by weight, and better still from 0.05 to 0.5% by weight, relative to the total weight of the composition.
Preferably, the total amount of thickening polymer(s) chosen from cross-linked (meth)acrylic acid homopolymers, preferably cross-linked by an allyl ether of an alcohol of the sugar series; and/or cross-linked copolymers of (meth)acrylic acid and of (C1-C6)alkyl acrylate; preferably cross-linked copolymers of (meth)acrylic acid and of ethyl acrylate, present in the composition according to the present invention ranges from 0.01 to 5% by weight, more preferably from 0.02 to 1% by weight, and better still from 0.05 to 0.5% by weight, relative to the total weight of the composition.
The composition used according to the invention also comprises one or more compound(s) of formula (I)
The total amount of compound(s) of formula (I) present in the composition according to the present invention preferably ranges from 0.05 to 5% by weight, and more preferably from 0.1 to 1% by weight, relative to the total weight of the composition. Preferably, the total amount of menthol, menthoxy propanediol, and mixture thereof, present in the composition according to the present invention ranges from 0.05 to 5% by weight, and more preferably from 0.1 to 1% by weight, relative to the total weight of the composition.
The composition used according to the invention comprises one or more oxyalkylenated C8-C30 fatty alcohols, preferably one or more oxyethylenated C8-C30 fatty alcohols. These compounds are non-ionic surfactants.
The term “fatty alcohol”, according to the present invention, means an alcohol comprising linear or branched, saturated or unsaturated alkyl chain comprising at least 8 carbon atoms.
According to the present invention, an oxyalkylenated fatty alcohol means a fatty alcohol comprising at least one oxyalkylenated (alkylene oxide) unit, and an oxyethylenated fatty alcohol means a fatty alcohol comprising at least one oxyethylenated (ethylene oxide) unit.
According to the present invention, such a fatty alcohol comprises from 8 to 30 carbon atoms, more preferably from 10 to 24 carbon atoms and better still from 10 to 18 carbon atoms.
Preferably, the fatty alcohols according to the present invention comprise a linear and saturated alkyl chain.
The oxyalkylene units are more particularly oxyethylene or oxypropylene units, or a combination thereof, preferably oxyethylene units.
The number of oxyalkylene units, and particularly oxyethylene units, advantageously ranges from 1 to 50, preferably from 2 to 30, more preferably from 5 to 20, and better still from 10 to 15.
The oxyalkylenated C8-C30 fatty alcohol(s) used in the present invention is/are preferably chosen from oxyethylenated fatty alcohols comprising a C10-C18 alkyl chain and from 5 to 20 oxyethylene units, and more preferably from oxyethylenated fatty alcohols comprising a C10-C18 alkyl chain and from 10 to 15 of oxyethylene units.
More preferably, the oxyalkylenated fatty alcohol is the oxyethylenated lauryl alcohol containing 12 units of ethylene oxide (laureth-12).
The total amount of oxyalkylenated C8-C30 fatty alcohols present in the composition according to the present invention preferably ranges from 0.1 to 10% by weight, preferably from 0.2 to 5% by weight, more preferably from 0.5 to 3% by weight, relative to the total weight of the composition.
Preferably, the total amount of oxyethylenated fatty alcohols comprising a C10-C18 alkyl chain and from 5 to 20 oxyethylene units, and more preferably from oxyethylenated fatty alcohols comprising a C10-C18 alkyl chain and from 10 to 15 of oxyethylene units, present in the composition according to the present invention ranges from 0.1 to 10% by weight, preferably from 0.2 to 5% by weight, more preferably from 0.5 to 3% by weight, relative to the total weight of the composition.
The composition according to the present invention may further comprise one or more additional non-ionic surfactant(s) different from the above-described oxyalkylenated C8-C30 fatty alcohols.
The non-ionic surfactant(s) that may be used in the compositions are described, for example, in the Handbook of Surfactants by M. R. Porter, published by Blackie & Son (Glasgow and London), 1991, pp. 116-178.
Examples of additional non-ionic surfactants that may be mentioned include the following non-ionic surfactants:
The oxyalkylene units are more particularly oxyethylene or oxypropylene units, or a combination thereof, preferably oxyethylene units.
The number of moles of ethylene oxide and/or propylene oxide preferably ranges from 1 to 250, more particularly from 2 to 100 and better still from 2 to 50; the number of moles of glycerol ranges especially from 1 to 50 and better still from 1 to 10.
Advantageously, the additional non-ionic surfactants according to the invention do not comprise any oxypropylene units.
As examples of glycerolated nonionic surfactants, use is preferably made of monoglycerolated or polyglycerolated C8-C40 alcohols, comprising from 1 to 50 mol of glycerol and preferably from 1 to 10 mol of glycerol.
Examples of saturated or unsaturated, oxyethylenated plant oils that may be mentioned include derivatives of polyoxyethyleneglycol hydrogenated vegetable/plant oil. Preferably, the number of polyoxyethyleneglycol groups ranges from 1 to 250, more preferably from 2-100, better still from 1 to 60, and even more preferably from 50 to 60.
The hydrogenated plant oil component may or may not contain linear or branched, saturated or unsaturated C8-C18 carbon chains substituted by one or more ethyleneglycol groups.
The additional non-ionic surfactant(s), different from the non-ionic surfactant(s) chosen from oxyalkylenated C8-C30 fatty alcohols, is (are) advantageously chosen from esters of saturated or unsaturated, linear or branched, C8-C30 acids and of sorbitol, preferably oxyethylenated; saturated or unsaturated, oxyethylenated plant oils, and mixtures thereof.
Preferably, the additional non-ionic surfactant(s), different from oxyalkylenated C8-C30 fatty alcohols, is/are chosen from
More preferably, the composition used according to the invention comprises:
Much more preferably, the composition used according to the invention comprises PEG-60 hydrogenated castor oil and sorbitan monolaurate with 4 OE units (polysorbate 21).
The total amount of the additional non-ionic surfactant(s) different from oxyalkylenated C8-C30 fatty alcohols, when present, preferably ranges from 0.05 to 5% by weight, preferably from 0.1 to 4% by weight, and more preferably from 0.2 to 3% by weight, relative to the total weight of the composition.
The total amount of additional non-ionic surfactant(s) chosen from saturated or unsaturated, oxyethylenated plant oils, when present, preferably ranges from 0.05 to 1% by weight, more preferably of from 0.1 to 0.5% by weight, and better still from 0.15 to 0.35% by weight, relative to the total weight of the composition.
The total amount of additional non-ionic surfactant(s) chosen from esters of saturated or unsaturated, linear or branched, C8-C30 acids and of sorbitol, preferably oxyethylenated with 1 to 18 OE, when present, preferably ranges from 0.05 to 5% by weight, preferably from 0.1 to 2, and more preferably from 0.2 to 1% by weight, relative to the total weight of the composition.
Preferably, when additional non-ionic surfactants are present in the composition of the invention, their total amount is lower than the total amount of oxyalkylenated C8-C30 fatty alcohols.
In other words, the weight ratio between the total amount of additional non-ionic surfactant(s) and the total amount of non-ionic surfactant(s) chosen from oxyalkylenated C8-C30 fatty alcohols is preferably lower than 1.
The composition according to the present invention also comprises one or more alcohols comprising a C1-C8 alkyl chain.
According to the present invention, the alcohols comprising a C1-C8 alkyl chain are water-soluble solvents and have a solubility of greater than or equal to 5% by weight in water at 25° C. and at atmospheric pressure (1 atm).
The alcohols comprising a C1-C8 alkyl chain preferably comprise from 1 to 8, preferably from 1 to 3, OH groups and from 2 to 8, preferably from 2 to 6, carbon atoms. The alcohols comprising a C1-C8 alkyl chain are preferably chosen from linear or branched, preferably saturated, monoalcohols or diols comprising from 2 to 8 carbon atoms, such as ethyl alcohol, isopropyl alcohol, hexylene glycol (2-methyl-2,4-pentanediol), neopentyl glycol, 3-methyl-1,5-pentanediol, butylene glycol, dipropylene glycol or propylene glycol; aromatic alcohols, such as phenylethyl alcohol; polyols comprising more than two hydroxyl functional groups, such as glycerol; polyol ethers, such as, for example, ethylene glycol monomethyl, monoethyl and mono-butyl ethers, propylene glycol or its ethers, such as, for example, propylene glycol monomethyl ether; and also diethylene glycol alkyl ethers, in particular C1-C4 alkyl ethers, such as, for example, diethylene glycol monoethyl ether or monobutyl ether, alone or as a mixture.
Preferably, said alcohols comprising a C1-C8 alkyl chain is/are chosen from mono-alcohols comprising from 2 to 8 carbon atoms, diols comprising from 2 to 8 carbon atoms and mixtures thereof, and more preferably from monoalcohols comprising from 2 to 8 carbon atoms, ethanol being most preferred.
The total amount of alcohol(s) comprising a C1-C8 alkyl chain present in the composition according to the invention preferably ranges from 10 to 50% by weight, more preferably from 15 to 40% by weight, most preferably from 18 to 35% by weight, relative to the total weight of the composition.
Preferably, the total amount of monoalcohols comprising from 2 to 8 carbon atoms, diols comprising from 2 to 8 carbon atoms and mixtures thereof, and more preferably from monoalcohols comprising from 2 to 8 carbon atoms, present in the composition according to the invention ranges from 10 to 50% by weight, more preferably from 15 to 40% by weight, most preferably from 18 to 35% by weight, relative to the total weight of the composition.
Preferably, the weight ratio between the total amount of compound(s) of formula (I) and the total amount of alcohols comprising a C1-C8 alkyl chain ranges from 0.001 to 1, more preferably from 0.005 to 0.5, and better still from 0.01 to 0.1.
Preferably, the weight ratio between the total amount of thickening polymer(s) and the total amount of alcohols comprising a C1-C8 alkyl chain ranges from 0.001 to 1, more preferably from 0.005 to 0.5, better still from 0.01 to 0.1.
The composition used according to the present invention also comprises water, which preferably represents from 40 to 95% by weight, more preferably from 50 to 90% by weight, better still from 55 to 85% by weight, and even more preferably from 65 to 80% by weight, relative to the total weight of the composition.
The cosmetic composition used according to the present invention may further comprise one or more additive(s) other than the compounds of the invention.
As additives that may be used in accordance with the invention, mention may be made of fatty substances; cationic, anionic or amphoteric surfactants or mixtures thereof; antidandruff agents; anti-seborrhea agents; agents for preventing hair loss and/or for promoting hair regrowth; vitamins and provitamins including panthenol; sunscreens; mineral or organic pigments; sequestrants; plasticizers; solubilizers; acidifying agents; opacifiers or nacreous agents; antioxidants; hydroxy acids; fragrances and preserving agents.
Needless to say, a person skilled in the art will take care to select this or these optional additional compound(s) such that the advantageous properties intrinsically associated with the composition according to the invention are not, or are not substantially, adversely affected by the envisaged addition(s).
The above additives may generally be present in an amount, for each of them, of between 0.001 and 20% by weight, relative to the total weight of the composition.
According to a preferred embodiment of the present invention, the composition may comprise one or more anionic polymers, different from thickening polymers described previously, preferably selected from hyaluronic acid and derivatives thereof.
Hyaluronic acid can be represented by the following chemical formula:
In the context of the present invention, the term “hyaluronic acid” covers in particular the basic unit of hyaluronic acid of formula:
This is the smallest fraction of hyaluronic acid comprising a disaccharide dimer, namely D-glucuronic acid and N-acetylglucosamine.
The term “hyaluronic acid and derivatives thereof” also comprises, in the context of the present invention, the linear polymer comprising the polymeric unit described above, linked together in the chain via alternating β(1,4) and (1,3) glycosidic linkages, having preferably a molecular weight (Mw) that can range between 380 and 13,000,000 daltons. This molecular weight depends in large part on the source from which the hyaluronic acid is obtained and/or on the preparation methods.
The term “hyaluronic acid and derivatives thereof” also comprises, in the context of the present invention, hyaluronic acid salts. As the salts, mention may be made of alkaline metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts, ammonium salts, and mixtures thereof.
Preferably the composition used according to the invention comprises hyaluronic acid and/or a salt thereof, preferably hyaluronic acid and/or an alkaline metal or alkaline earth metal salt thereof; and more preferably sodium hyaluronate.
The total amount of the anionic polymer(s), different from thickening polymers, in the composition according to the present invention may be from 0.001 to 0.1% by weight, preferably from 0.002 to 0.05% by weight, and more preferably from 0.005 to 0.02% by weight, relative to the total weight of the composition.
The total amount of the hyaluronic acid and derivatives thereof in the composition according to the invention may be from 0.001 to 0.1% by weight, preferably from 0.002 to 0.05% by weight, and more preferably from 0.005 to 0.02% by weight, relative to the total weight of the composition.
Preferably, the composition according to the invention is provided in the form of a thickened hydroalcoholic lotion or composition, and more preferably in the form of a hydroalcoholic gelified lotion or composition.
Preferably, the composition used in the process according to the invention comprises:
The following example serves to illustrate the invention without, however, being limiting in nature.
In the examples that follow and unless otherwise indicated, the amounts are given as mass percentages of active material relative to the total weight of the composition (% AM=% active matter).
The following composition according to the invention was prepared:
A study was done on 18 braided hair women aged 20-40 years, having their braids on for a minimum of 2 weeks. The composition was applied on scalp and braided hair at least 3 times during a period of 7 days.
The study shows that the product provided immediate and long-lasting relief of itchiness, dandruff and discomfort; pleasant and soothing sensation on the scalp. It also shows that braided hair and scalp are moisturized and nourished. The composition makes the braided hair texture soft.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021/02218 | Apr 2021 | ZA | national |
| 2104489 | Apr 2021 | FR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2022/057152 | 3/18/2022 | WO |
