Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • A61K8/8147—Homopolymers or copolymers of acids; Metal or ammonium salts thereof, e.g. crotonic acid, (meth)acrylic acid; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/042—Gels
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q5/00—Preparations for care of the hair
  • A61Q5/06—Preparations for styling the hair, e.g. by temporary shaping or colouring
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/04—Acids; Metal salts or ammonium salts thereof
  • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/48—Thickener, Thickening system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/80—Process related aspects concerning the preparation of the cosmetic composition or the storage or application thereof
  • A61K2800/95—Involves in-situ formation or cross-linking of polymers

Definitions

• the present invention relates to the technical field of caring for and shaping the hair using cosmetic compositions.
• the subject of the invention is an aqueous cosmetic composition
• a fixing resin of a specific chemical nature comprising a fixing resin of a specific chemical nature, and the use of this resin to improve the resistance in a humid environment of said composition.
• the fixing agents used in hair gels are generally film-forming polymers which bind the hair together, thus facilitating their shaping.
• the fixing agents usually used are natural gums, such as guar gum, or else anionic or neutral polymers.
• the film must be transparent, more or less flexible depending on the desired effect but have a certain resistance, a certain strength. Also, the film must not crumble over time or under stress (combing, various friction) and not become sticky when the climatic conditions become humid.
• these polymers otherwise called resins, must make it possible to formulate clear compositions and having rheological characteristics in line with the packaging (aerosol, tube, jar) and consumer expectations (gel-like viscosity, pseudoplastic, non-sticky, drying. fast).
• the cosmetic compositions based on these polymers contain thickeners which provide the rheological properties mentioned above.
• Document WO 99/13836 describes solvent-based cosmetic compositions for hair containing a reduced level of volatile organic compound (VOC, or VOC in English) to meet environmental requirements. These compositions are based on a specific solvent combination comprising associated ethanol, either with methyl acetate or with butyl acetate.
• a fixing resin which may be, according to the examples disclosed, chosen from a series of polymers, and in particular from an octylacrylamide / acrylates / butylaminoethyl methacrylate copolymer, a vinyl acetate / crotonates / vinyl neodecanoate copolymer, a diglycol copolymer / cyclohexane dimethanol / isophthalates / sodium sulfoisophthalate.
• a fixing resin which may be, according to the examples disclosed, chosen from a series of polymers, and in particular from an octylacrylamide / acrylates / butylaminoethyl methacrylate copolymer, a vinyl acetate / crotonates / vinyl neodecanoate copolymer, a diglycol copolymer / cyclohexane dimethanol / isophthalates / sodium sulf
• Document EP 0 761 199 describes cosmetic compositions for the hair comprising a fixing agent and a particular acrylic copolymer.
• the fixing agent is chosen from anionic, cationic or amphoteric polymers, and among the list of anionic polymers are mentioned copolymers of acrylic or methacrylic acid without specifying either their chemical composition or their molecular weight.
• Acrylic copolymer is a tetrapolymer composed of alkyl acrylate, alkyl methacrylate, acrylic acid and methacrylic acid. The total amount of both acrylic acid and methacrylic acid monomers does not exceed 15% by weight. This tetrapolymer has a molecular weight of between 10,000 and 50,000 g / mol. These compositions exhibit acceptable moisture resistance but which can nevertheless be improved.
• Patent EP 0 589 241 describes a polymer used in the field of printed circuits, comprising at least 20 mol% of monomer units of methacrylic acid, monomers of methyl methacrylate and monomers of ethyl acrylate. This polymer is used in solution in methyl ethyl ketone. The polymer is not water soluble and therefore not suitable for an aqueous composition.
• EP 2 248 510 describes thickening polymers and their use in aqueous compositions. Said aqueous composition comprises two thickening polymers, including a first thickening polymer comprising from 10% to 50% by weight of methacrylic acid, and a second thickening polymer not comprising methacrylic acid.
• EP 1 402 877 describes aqueous compositions comprising a surfactant, clay, and a copolymer comprising monomers of acrylic acid, alkyl methacrylate, modified methacrylate, and optionally methacrylic acid.
• This resin comprises a copolymer comprising monomers of methacrylic acid, methyl methacrylate, hydroxyethyl methacrylate, and alkyl acrylate.
• the percentage of methacrylic acid monomers in the copolymer is preferably low, that is to say less than or equal to 18% by weight, ie 21.5% molar, so as not to degrade the retention of the hair curls (" curl retention ”in English).
• the Applicant has now discovered, surprisingly and unexpectedly, that a specific selection of a polymer, by the nature and the amounts of monomers constituting it, as well as a judicious choice of molecular weight, made it possible to achieve the objectives described above. .
• the present invention therefore provides an aqueous cosmetic composition for hair offering excellent hold properties in a humid environment over several hours, without a sticky effect and easy to remove during washing.
• the present invention relates to an aqueous cosmetic composition for hair comprising at least one fixing resin, said resin comprising:
• the resin being water-soluble and having a weight average molecular weight greater than or equal to 20,000 g / mol (> 20,000 g / mol).
• the sum of the molar percentages of the monomeric units of the resin is equal to 100%.
• Those skilled in the art will know how to adjust the respective percentages to reach 100%, and this with at least 30 mol% of methacrylic acid and / or one of its salts and at least 10 mol% of acrylic acid and / or maleic acid and / or itaconic acid, and / or one of their salts.
• said resin consists of, or essentially consists of:
• the resin being water-soluble and having a weight average molecular weight greater than or equal to 20,000 g / mol (> 20,000 g / mol).
• the term "consisting of” means that the resin comprises only monomeric units of methacrylic acid, and / or a salt thereof, at least 30% molar, and monomeric units of acrylic acid and / or acid. maleic and / or itaconic acid, and / or one of their salts, at least 10 mol%. The sum of these molar percentages is then equal to 100%.
• the present invention also relates to the use as a fixing agent of this resin in an aqueous cosmetic composition for hair, in particular for improving the resistance to humidity of this cosmetic composition.
• the term “fixing resin” is understood to mean a polymer making it possible to give a cosmetic composition a temporary holding effect, fixing the hairstyle but also holding the curls, even in a humid environment.
• the fixing resin will denote the “dry” polymer, and not the solution containing the polymer.
• a solution containing the polymer is used, said solution generally containing 15 to 25% of polymer, by weight relative to the weight of the solution. This is called a solution containing 15 to 25% of active material, by weight relative to the weight of the solution.
• the amounts of fixing resin will be given as a percentage by weight of active material, unless this is contraindicated.
• the fixing resin comprises at least 30 mol% of monomer units of methacrylic acid and / or one of its salts, preferably at least 40 mol%, more preferably at least 50 mol%, again more preferably at least 60 mol% and even more preferably at least 70 mol%.
• the fixing resin comprises less than 99 mol% of monomer units of methacrylic acid and / or one of its salts, preferably less than 95 mol%, more preferably less than 90 mol%, again more preferably less than 80 mol%.
• the salts of methacrylic acid include in particular the salts of an alkaline earth metal (preferably calcium or magnesium) or of an alkali metal (preferably sodium or lithium) or ammonium (in particular quaternary ammonium).
• an alkaline earth metal preferably calcium or magnesium
• an alkali metal preferably sodium or lithium
• ammonium in particular quaternary ammonium
• the fixing resin comprises at least 1 mol% of monomeric units of acrylic acid and / or maleic acid and / or itaconic acid and / or one of their salts, preferably less 10 mol%, more preferably at least 20 mol%.
• the fixing resin comprises less than 80 mol% of monomeric units of acrylic acid and / or maleic acid and / or itaconic acid and / or one of their salts, preferably less 70 mol%, more preferably less than 60 mol%, even more preferably less than 50 mol%, even more preferably less than 40 mol% and even more preferably less than 30 mol%.
• molar percentage is meant molar percentages based on all the moles of monomer of the resin or of the polymer.
• the amount of branching agent or of crosslinking agent is not taken into account to determine all the moles of monomer of the resin (or of the polymer).
• the fixing resin comprises monomeric units of methacrylic acid and / or one of its salts, monomeric units of acrylic acid and / or maleic acid and / or itaconic acid and / or one of their salts, and optionally nonionic monomers and / or cationic monomers.
• the fixing resin comprises monomeric units of methacrylic acid and / or one of its salts, monomeric units of acrylic acid and / or one of its salts, and optionally nonionic monomers and / or cationic monomers.
• the fixing resin is preferably a copolymer of methacrylic acid and acrylic acid, and / or their salts.
• the resin is a copolymer comprising only monomeric units of methacrylic acid and acrylic acid, and / or their salts.
• alkaline earth metal preferably calcium or magnesium
• alkali metal preferably sodium or lithium
• ammonium in particular quaternary ammonium
• the preferred salts are the sodium salts.
• the weight average molecular weight of the resin is preferably greater than or equal to 60,000 g / mol, more preferably greater than or equal to 100,000 g / mol.
• It is preferably less than or equal to 2,000,000 g / mol ( ⁇ 2 million g / mol), more preferably less than or equal to 1,000,000 g / mol, even more preferably less than or equal to 500,000 g / mol, again more preferably less than or equal to 300,000 g / mol.
• the weight average molecular weight is determined in a conventional manner by size exclusion chromatography. It is measured, for example, on an Agilent 1260 Inf ⁇ nity system equipped with a Dawn HELOS, OPtilab T-Rex multi-angle light scattering detector and 3 columns in series: Shodex SB 807-G, Shodex SB 807-HQ and Shodex 805-HQ.
• the fixing resin is preferably a water-soluble polymer.
• water-soluble polymer means a polymer which gives an aqueous solution when it is dissolved with stirring at 25 ° C. at a concentration of 20 gL 1 in water.
• the fixing resin can also comprise at least nonionic and / or cationic monomeric units. In this case, it is preferable to limit the amount of these monomers to less than 20 mol%, preferably to less than 10 mol%.
• the nonionic monomers are preferably selected from the group comprising acrylamide, methacrylamide, N-vinylformamide, and N-vinylpyrrolidone.
• Acrylamide is preferred.
• the fixing resin is devoid of hydroxylated monomers, for example of hydroxypropyl acrylate and / or alkyl (meth) acrylate type.
• the cationic monomers are preferably chosen from the group comprising quaternized or salified dimethylaminoethyl acrylate (AD AME); quaternized or salified dimethylaminoethyl methacrylate (MADAME); dimethyldiallylammonium chloride (DADMAC); acrylamido propyltrimethyl ammonium chloride (APTAC); and methacrylamido propyltrimethyl ammonium chloride (MAPTAC).
• AD AME quaternized or salified dimethylaminoethyl acrylate
• MADAME quaternized or salified dimethylaminoethyl methacrylate
• DDADMAC dimethyldiallylammonium chloride
• ATAC acrylamido propyltrimethyl ammonium chloride
• MATAC methacrylamido propyltrimethyl ammonium chloride
• ADAME and MADAME monomers for example by means of acid (in particular hydrochloric acid) or of an alkyl halide of the RX type, R being an alkyl group and X being a halogen (especially methyl chloride).
• a branching agent or a crosslinking agent is, for example, chosen from methylene-bis-acrylamide (MBA), ethylene glycol diacrylate, tetraallyl ammonium polyethylene glycol chloride, diacrylamide, cyanomethyl acrylate, epoxides and mixtures thereof.
• MVA methylene-bis-acrylamide
• ethylene glycol diacrylate ethylene glycol diacrylate
• tetraallyl ammonium polyethylene glycol chloride diacrylamide
• diacrylamide diacrylamide
• cyanomethyl acrylate epoxides and mixtures thereof.
• a free radical chain transfer agent also known as a chain limiter.
• the use of a chain transfer agent is particularly advantageous for controlling the molecular weight of the polymer obtained.
• a transfer agent there may be mentioned methanol, isopropanol, sodium hypophosphite, 2-mercaptoethanol, sodium methallylsulphonate, and mixtures thereof.
• a person skilled in the art will know how to adjust the amounts of branching agent and optionally of transfer agent so as to preferably obtain a water-soluble resin.
• the resin or polymer does not require the development of a particular polymerization process. Indeed, it can be obtained using all the polymerization techniques well known to those skilled in the art. It can in particular be solution polymerization; gel polymerization; precipitation polymerization; emulsion polymerization (aqueous or reverse); suspension polymerization; reactive extrusion polymerization; water-in-water polymerization; or micellar polymerization.
• the preferred polymerization technique is solution polymerization. It indeed makes it possible to obtain polymers having a molecular weight in line with the desired effects and benefits.
• Polymerization is generally free radical polymerization.
• free radical polymerization is meant in particular free radical polymerization by means of UV, azo, redox or thermal initiators as well as controlled radical polymerization (CRP) techniques or matrix polymerization techniques.
• the aqueous cosmetic composition for the care and shaping of the hair is aqueous cosmetic composition for the care and shaping of the hair
• an aqueous composition refers to a composition containing water in a proportion such that the main phase is aqueous.
• aqueous cosmetic composition consisting of water and fixing resin is advantageously transparent.
• the term “transparent composition” is understood to mean a composition whose transmittance value measured at 420 nm is greater than 85%.
• the transmittance measurement is carried out at 420 nm, for example in a cell (advantageously a 1.5 mL polystyrene cell), with an optical path of 10 mm, at 25 ° C, for a solution comprising 2.4 g / L of resin in water.
• This measurement is carried out by means of a spectrophotometer, for example a spectrophotometer of the Hach Lange DR 600 type.
• composition according to the invention may be in the form of a gel, a solution, a spray, or a lacquer, without this being limiting.
• the composition is in the form of a gel. It is advantageously transparent according to the definition above.
• the aqueous cosmetic composition according to the invention preferably comprises between 0.05 and 10% by weight of the fixing resin, preferentially between 0.1 and 5% by weight, even more preferably between 0.15 and 1% by weight.
• the composition comprises:
• this aqueous cosmetic composition is advantageously transparent.
• composition according to the invention comprises water. It can also comprise a mixture of water and cosmetically acceptable solvents such as monoalcohols, polyalcohols, glycol ethers. Mention may more particularly be made of lower alcohols such as ethanol, isopropanol, polyalcohols such as diethylene glycol, glycol ethers.
• the water concentration is generally between 50 and 99% by weight relative to the total weight of the composition. It is preferably at least 60% by weight, preferably at least 80% and even more preferably at least 90%.
• any type of thickening agent can be used, including anionic, cationic, amphoteric polymers, with preference being given to crosslinked acrylic polyacids.
• Carbomers are particularly preferred. Their amount is generally between 0.01 and 10% by weight, preferably between 0.05 and 5% by weight.
• the pH of the compositions according to the invention is generally between 2 and 9, and in particular between 3 and 8. It can be adjusted to the value chosen by means of basifying or acidifying agents usually used in cosmetics for this type of application. .
• composition according to the invention When the composition according to the invention is pressurized in aerosol form in order to obtain a lacquer, it comprises at least one propellant which can be chosen from volatile hydrocarbons such as n-butane, propane, isobutane , pentane, chlorinated and / or fluorinated hydrocarbons and their mixtures. Carbon dioxide, nitrous oxide, dimethyl ether, nitrogen, compressed air and mixtures thereof can also be used as the propellant.
• volatile hydrocarbons such as n-butane, propane, isobutane , pentane, chlorinated and / or fluorinated hydrocarbons and their mixtures.
• Carbon dioxide, nitrous oxide, dimethyl ether, nitrogen, compressed air and mixtures thereof can also be used as the propellant.
• the propellant concentration is generally between 10 and 50% by weight relative to the total weight of the pressurized composition.
• compositions according to the invention may also contain surfactants, preservatives, sequestrants, softeners, colorants, viscosity modifiers, foam modifiers, anti-foam agents, pearlescent agents, moisturizers, anti-dandruff agents, agents antiseborrheics, sun filters, proteins, vitamins, plasticizers, hydroxy acids, and fragrances.
• compositions according to the invention can also contain other conditioning agents. These can then be chosen from natural or synthetic oils and waxes, fatty alcohols, esters of polyhydric alcohols, glycerides, silicone gums and resins or mixtures of these different compounds.
• compositions used according to the invention are, for example, rinsed or non-rinsed hair compositions, gels or solutions. They are, for example, styling lotions, brushing lotions, fixing compositions (lacquers) and styling.
• the lotions can be packaged in various forms, in particular in vaporizers, pump-dispenser bottles or in aerosol containers in order to ensure application of the composition in vaporized form.
• the compositions in gel form are for example packaged in the form of jars, preferably transparent.
• Figure 1 illustrates the change in the percentage of curl hold (TB) (or “curl retention”) over time of compositions containing a fixing resin.
• 203.0 g of water and 50 mg of sodium hypophosphite are introduced into a jacketed reactor equipped with mechanical stirring with pale half-moon, a condenser and a temperature sensor.
• the medium is heated to 83 ° C.
• a solution containing acrylic acid (AA) and methacrylic acid (AM A) or hydroxypropyl acrylate (HP A) comonomer is added over a period of 120 minutes.
• AA and AMA or HPA are shown in Table 1.
• a 10.0% by weight sodium persulfate solution is added over a period of 135 minutes.
• the medium is cooled to 60 ° C and 156.8 g of water is added to the medium.
• the pH is adjusted between 2.2 and 3.0 then the medium is stirred for an additional hour.
• the product is then filtered at 300 mhi.
• Polymeric solutions corresponding to Examples 2 to 6 are obtained, the compositions and the average molecular weights by weight (Mw) of which are detailed in Table 1.
• the resin of the composition of Example 1 for its part contains only monomers of acrylic acid.
• EDTA ethylenediaminetetraacetic acid
• the clarity of the gels is determined by measuring the transmittance of light on a Hach Lange DR 600 spectrophotometer. These measurements were carried out at 420 nm in 1.5 mL PS cuvettes, at 25 ° C., for a solution comprising 2.4 g / L of resin in water.
• the viscosity of the gels is determined at 23 ° C. with a Brookfield RVT viscometer at a speed of 20 revolutions / min. Those skilled in the art know how to choose the modulus depending on the viscosity of the gels. In the present case, and given the composition of the gel and the desired texture, module 7 is used.
• compositions C’I to C’6 are all transparent because they have a clarity greater than 85% T. Their viscosity and their rheological property are very good.
• compositions C’I to C’6 containing respectively the resins of Examples 1 to 6.
• a lock of European type hair is immersed in the hydroalcoholic resin solution and the excess solution is removed by passing the lock over its entire length between two fingers. The lock is then combed once and then wound on a sulk.
• the locks on the looper are then placed for 24 hours at 23 ° C and 50% relative humidity.
• the wicks are unwound and placed in an oven with controlled humidity at 90% at 25 ° C.
• the length of the bit at to serves as a reference (Li) for calculating the percentage of loop resistance (% TB), also known as the percentage of curl retention (% CR).
• the length of the wicks is measured at different time intervals (Lt).
• the percentage of curl retention is calculated using the following relationship:
• % TB [(L - Lt) / (L - Li)] * 100
• compositions C'3 and C'4 respectively containing the resins of Examples 3 45% mol AMA) and 4 (71% mol AMA), offer excellent resistance to humidity, although greater than those obtained with compositions C'I and C'2, containing the resins of Examples 1 (0 mol% AMA) and 2 (8.5 mol% AMA).
• Composition C'2 exhibits poorer curl hold than composition C'I.
• compositions C’5 and C’6 offer very poor resistance to humidity.
• the observation of the C’6 curve compared to the C’3 curve allows us to say that the substitution of AMA by HPA strongly degrades the resistance to humidity.
• curve C’5 Observation of curve C’5 compared to curve C’3 highlights the importance of the molecular weight of the resin on the resistance to humidity of the composition containing it. Indeed, composition C’5 containing an AA / AMA 45/55 copolymer with a weight average molecular weight of less than 20,000 g / mol does not make it possible to increase the curl strength.
• compositions C’3 and C’4 according to the invention do not exhibit any tacky effect and are easy to remove during washing, thus satisfying the desired criteria.
• a homopolymer of methacrylic acid (example 7), that is to say containing 100 mol% of monomeric units of methacrylic acid, is prepared according to the method described in the scientific publication "High Molecular Weight Poly (methacrylic acid) with Narrow Polydispersity by RAFT Polymerization ”- Macromolecules, 2009, 42, pages 1494-1499.
• the polymer obtained corresponds to Example 7.
• Another polymer is prepared by the same method except that 12 mol% of methacrylic acid is replaced by 12 mol% of acrylic acid.
• the polymer obtained corresponds to Example 8.
• the polymer of Example 7 has such a high viscosity that it is too difficult to handle for use by formulators of cosmetic compositions.
• Example 8 can be handled.
• a C'8 hair gel composition is made with the polymer of Example 8 according to the formulation in Table 2.
• the gel viscosity is 52,000 cps, and the clarity 91%.
• the same wet strength test as in part 3 / is carried out, and the loop resistance at 300 minutes is 93%, which is very satisfactory and demonstrates the technical effect of the polymers of the invention.
• polymers of lines 2, 5 and 8 of Table 1 of document EP1402877 are produced. They are denoted respectively Examples 9, 11 and 13.
• a polymer 10 is produced as the polymer 9 in which 10 mol% of ethyl acrylate are replaced by 10 mol% of acrylic acid.
• Polymer 12 is made like polymer 11 in which 25 mole% ethyl acrylate is replaced by 25 mole% methacrylic acid.
• a polymer 14 is made such as polymer 13 in which 25 mole% of methyl acrylate is replaced by 25 mole% of methacrylic acid.
• Table 4 summarizes the composition of polymers 9 to 14.
• the values of acrylic acid (AA), methacrylic acid (AMA), ethyl acrylate (EA), methyl acrylate (MA) and Lipol 1 are expressed in mol%.
• the values of diallyl phthalate (DAP) and n-dodecyl mercaptan (DDM) are expressed in% by mass.
• the molecular weight of Lipol 1 is 1188 g / mol.
• Lipol 1 is a lipophilically modified monomer having a linear saturated alkyl group of 18 carbon atoms connected via 20 ethylene oxide residues to a methacryloyl group.
• the polymers 9 to 14 are used in the hair gel composition of Table 2, and the gel compositions obtained are respectively denoted C'9 to C '14.
• the viscosity of the gels and their clarity were measured according to the same. previously described methods. The results are reported in Table 5.
• Table 5 Viscosities and clarities of styling gels C'9 to C '14. The same resistance test in a humid environment as in part 3 / is carried out, and the results of loop resistance at 300 minutes are given in table 6.
• Example 9 Increasing the proportion of acrylic acid from 7.13mol% to 15 mol% in Example 9 makes it possible to improve the loop resistance by more than 10%. Increasing the proportion of acrylic acid from 11.58 mol% to 36.58 mol% in Example 11 makes it possible to improve the loop resistance by more than 30%. Increasing the proportion of acrylic acid from 10.55 mol% to 30.55 mol% in Example 13 makes it possible to improve the loop resistance by more than 31%.

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