Use of a particular polyurethane to add volume to the hair and method of treating hair using this polyurethane

Abstract

The present invention relates to the use of a particular polyurethane or a composition comprising it for providing volume to the hair, in particular near the roots by a root lifting effect and a method for treating hair using the particular polyurethane or the composition comprising it.

Description

Title of the invention: Use of a particular polyurethane to add volume to the hair and method for treating hair using this polyurethane Technical field of the invention

[0001] The present invention relates to the use of a particular polyurethane or a composition comprising it to provide volume to the hair, in particular near the roots by a root lifting effect and a method for treating hair using the particular polyurethane or the composition comprising it. Background to the invention

[0002] Due to their nature, some hair is fine and / or has a lack of density and / or a lack of volume. It is sometimes difficult to style it and give it volume, especially near the scalp. We often misuse the term "flat hair" to express this lack of volume near the root. In order to remedy this problem, some people with this type of hair seek to "lift the roots" of their hair to give the appearance of more hair and / or volume. In order to increase the lift of the roots, it is thus possible to dry your hair upside down and / or apply fixing hairsprays while avoiding hair care products which can sometimes cause the hair to become heavier, especially those using silicone compounds.However, the observed root lifting effect may tend to fade quickly over time, particularly when the hair is subjected to high humidity conditions and / or mechanical effects such as wind or wearing a hood, and / or shampooing.

[0003] Thus, there is a real need to find a way to remedy these drawbacks, in particular to add volume to the hair, in particular near the roots by a root lifting effect, the observed effect being in particular resistant to humidity and lasting at least once after shampooing.

[0004] The applicant has surprisingly discovered that all or part of these objectives can be achieved by the use of a particular polyurethane to provide volume to the hair, in particular near the roots by a root lifting effect. Summary of the invention

[0005] According to a first aspect, the subject of the present invention is the use of one or more polyurethanes or of a composition (C) comprising the polyurethane(s) to add volume to the hair, particularly near the roots by a root lifting effect, the polyurethane(s) being capable of being obtained from: Bi) of at least one polyol chosen from: ■ Bii) a polyester polyol resulting from the reaction of: 3 at least one polyol Bm) with 3 at least one polycarboxylic acid Bn2) and 3 optionally Bn3) at least one monocarboxylic acid; ■ Bi2) a diol; and ■ the mixture of Bu) and B[2); and B2) at least one polyisocyanate, preferably a diisocyanate, in particular aliphatic or cycloaliphatic and mixtures thereof; and B3) of at least one hydrophilic monomer chosen from: ■ B3i) compounds carrying an acid function, in particular carboxylic, or a basic function, in particular primary, secondary or tertiary amine, and further comprising at least one hydroxyl function, preferably at least two hydroxyl functions, in particular two hydroxyl functions such as 2,2-bis(hydroxymethyl)propionic acid and ■ B32) diamine compounds of formula H2N-R5-NH2 (Xa) in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or of formula H2N-R6-NHR7 (Xb) in which R6 represents an alkylene radical and R7 represents an alkyl radical substituted by one or more ionic or potentially ionic groups; and B4) optionally at least one amino compound which is not substituted by one or more ionic or potentially ionic groups.

[0006] According to a second aspect, the subject of the present invention is a method for treating hair comprising the application to the hair of the polyurethane(s) as defined above or of the composition (C) as defined above, close to the roots, preferably at least over an area of ​​between 0 and 10 cm measured relative to the surface of the scalp, more preferably at least over an area of ​​between 0 and 5 cm measured relative to the surface of the scalp. Detailed description of the invention

[0007] For the purposes of the present invention, and unless otherwise indicated:

[0008] ■ by "polyurethane" we mean a urethane polymer, ie an organic polymer including the function repetition -N(R)-C(O)-O-.

[0009] ■ by "(hetero)aryl" we mean aryl or heteroaryl groups.

[0010] ■ by "(hetero)cycloalkyl" we mean cycloalkyl or heterocycloalkyl groups.

[0011] 'the "aryl" or "heteroaryl" radicals or the aryl or heteroaryl part of a radical may be substituted by at least one substituent carried by a carbon atom, chosen from:

[0012] - a C1-C6 alkyl radical, preferably C1-C4;

[0013] - a halogen atom such as chlorine, fluorine or bromine;

[0014] - a hydroxy group;

[0015] - a C1-C2 alkoxy radical; a C2-C4 (poly)-hydroxyalkoxy radical;

[0016] - an amino radical;

[0017] - an amino radical substituted by one or two alkyl radicals, identical or different, in Ci-C6, Ci-C6, preferably in CrC4;

[0018] - an acylamino radical (-NR-COR') in which the radical R is an atom of hydrogen,

[0019] - a C1-C4 alkyl radical and the radical R' is a C1-C4 alkyl radical; a radical carbamoyl ((R)2N-CO-) in which the radicals R, identical or not, represent a hydrogen atom, a CrC4 alkyl radical;

[0020] - an alkylsulfonylamino radical (R'SO2-NR-) in which the radical R represents a hydrogen atom, a CrC4 alkyl radical and the radical R' represents a CrC4 alkyl radical, a phenyl radical;

[0021] - an aminosulfonyl radical ((R)2N-SO2-) in which the radicals R, identical or no, represent a hydrogen atom, a CrC4 alkyl radical;

[0022] - a carboxylic radical in acid or salified form (preferably with a metal alkali or ammonium, substituted or not);

[0023] - a cyano group (CN);

[0024] - a polyhalogeno(Ci-C4)alkyl group, preferably trifluoromethyl (CF3).

[0025] ■ the cyclic or heterocyclic part of a non-aromatic radical can be substituted by at least one substituent carried by a carbon atom chosen from the groups:

[0026] - hydroxy,

[0027] - CrC4 alkoxy, (poly)hydroxyalkoxy C2-C4,

[0028] - alkylcarbonylamino ((RCO-NR'-) in which the radical R' is an atom hydrogen, a C1-C4 alkyl radical and the radical R is a C1-C2 alkyl radical, amino substituted by one or two identical or different C1-C4 alkyl groups;

[0029] - alkylcarbonyloxy ((RCO-O-) in which the radical R is a C1-C4 alkyl radical, amino substituted by one or two identical or different CrC4 alkyl groups;

[0030] - alkoxycarbonyl ((RO-CO-) in which the radical R is a C1-C4 alkyl radical, amino substituted by one or two identical or different C1-C4 alkyl groups.

[0031] ■ a cyclic, heterocyclic radical, or a non-aromatic part of an aryl radical or heteroaryl, may also be substituted by one or more oxo groups.

[0032] ■ a hydrocarbon chain is unsaturated when it contains one or more double bonds and / or one or more triple bonds.

[0033] ■ an “aryl” radical represents a mono or polycyclic hydrocarbon group, condensed or not, comprising from 6 to 22 carbon atoms, and of which at least one cycle is aromatic; preferably the aryl radical is a phenyl, biphenyl, naphthyl, indenyl, anthracenyl, or tetrahydronaphthyl.

[0034] ■ a "heteroaryl" radical represents a mono or polycyclic group, condensed or not, comprising from 5 to 22 links, from 1 to 6 heteroatoms chosen from the nitrogen, oxygen, sulfur and selenium atom, and of which at least one cycle is aromatic; preferentially a heteroaryl radical is chosen from acridinyl, benzimidazolyl, benzobistriazolyl, benzopyrazolyl, benzopyridazinyl, benzoquinolyl, benzothiazolyl, benzotriazolyl, benzoxazolyl, pyridinyl, tetrazolyl, dihydrothiazolyl, imidazopyridinyl, imidazolyl, indolyl, isoquinolyl, naphthoimidazolyl, naphthooxazolyl, naphthopyrazolyl, oxadiazolyl, oxazolyl, oxazolopyridyl, phenazinyl, phenoxazolyl, pyrazinyl, pyrazolyl, pyrilyl, pyrazoyltriazyl, pyridyl, pyridinoimidazolyl, pyrrolyl, quinolyl, tetrazolyl, thiadiazolyl, thiazolyl, thiazolopyridinyl, thiazoylimidazolyl, thiopyrylyl, triazolyl, xanthylyl.

[0035] ■ a "cyclic" or "cycloalkyl" radical is a non-cyclic hydrocarbon radical aromatic, mono or polycyclic, condensed or not, containing from 5 to 22 carbon atoms, which may contain from 1 to several unsaturations, preferably the cycloalkyl is a cyclohexyl group.

[0036] ■ a "heterocyclic" or "heterocycloalkyl" radical is a non-cyclic radical mono or polycyclic aromatic, condensed or not, containing from 3 to 9 links, comprising from 1 to 4 heteroatoms chosen from the nitrogen, oxygen, sulfur and selenium atom, preferably the heterocycloalkyl is chosen from epoxide, pi-perazinyl, piperidinyl, morpholinyl, dithiolane.

[0037] ■ an "alkyl" radical is a saturated, linear or branched hydrocarbon radical, in particular particularly in C1-C6, preferably in C1-C4.

[0038] ■ an "alkylene" radical is a saturated, linear or divalent hydrocarbon radical branched, in particular in C1-C6, preferably in C1-C4.

[0039] ■ an "alkenyl" radical is an unsaturated, linear or branched hydrocarbon radical, comprising one or more double bonds, conjugated or not.

[0040] ■ an "alkynyl" radical is an unsaturated, linear or branched hydrocarbon radical, comprising one or more triple bonds, conjugated or not.

[0041] ■ an "alkoxy" radical is an alkyloxy radical for which the alkyl radical is a hydrocarbon radical, linear or branched, in C1-C6 preferentially in C1-C4.

[0042] The expressions “between ... and ...”, “includes from ... to ...”, “formed from ... to ...”, and “ranging from ... to ...” must be understood inclusively, unless otherwise specified.

[0043] The expressions "at least one" and "one or more" are synonymous and can be used interchangeably. Use

[0044] According to a first aspect, the subject of the present invention is the use of the polyurethane(s) as defined above or of the composition (C) as defined above comprising the polyurethane(s) to provide volume to the hair, in particular near the roots by a root lifting effect.

[0045] The applicant has found, surprisingly, that the polyurethane(s) or composition (C) comprising it(them) makes it possible to add volume to the hair, in particular near the roots by a root lifting effect, the observed effect being in particular resistant to humidity, or even to mechanical effects such as wind or wearing a hood and / or resistant to at least one shampoo. Polyurethanes B1) Polyol

[0046] As indicated previously, the polyurethane(s) may be obtained from at least one BJ polyol as defined previously. B11) Polyester polyol

[0047] According to a preferred embodiment, the polyurethane(s) are prepared from at least one polyester polyol Bu) resulting from the reaction of at least one polyol Bm) with at least one polycarboxylic acid Bn2) and optionally Bn3) at least one monocarboxylic acid. Bill) Polyol

[0048] The polyester polyol Bu) is obtained from at least one polyol Bm). The polyol Bm) preferably comprises from 2 to 6 hydroxyl groups (-OH), in particular two, three or four hydroxyl groups.

[0049] According to one form of the invention, the polyester polyols Bu) are dihydroxylated polyesters resulting from the reaction of at least one dihydroxylated organic compound (diol) with at least one polycarboxylic acid.

[0050] According to a particular embodiment, the polyol Bm) is an organic compound comprising a hydrocarbon chain, linear or branched, acyclic or (poly)cyclic, saturated or unsaturated, aromatic or not, comprising from 3 to 18 carbon atoms, in particular from 4 to 12 carbon atoms, or even from 5 to 10 carbon atoms; and from 2 to 6 hydroxyl groups, said hydrocarbon chain being optionally permanently interrupted by one or more oxygen atoms, in particular which may have ether functions.

[0051] As examples of such polyols Bm), mention may be made, without this list being limiting, of i) oses such as pentoses such as ribose, arabinose, xylose, lyxose, ribulose, xylulose or hexoses such as allose, altrose, galactose, glucose, idose, mannose, talose, fructose, sorbose or deoxyhexoses such as fucose or rhamnose; ii) triols such as glycerol, iii) tetraols such as pentaerythritol (tetramethylolmethane), erythritol, diglycerol, iv) pentols such as xylitol, v) hexols such as sorbitol and mannitol, or dipentaerythritol or triglycerol, and mixtures thereof.

[0052] According to a particular embodiment, the polyol Bm) is a diol of formula (I) HO-ALK-OH (I) in which ALK represents a linear or branched CrCi8, in particular CrC8, alkylene group. The polyol Bm) is then a (CrC8)alkane diol. The polyol Bm) is preferably a diol chosen from ethylene glycol, butylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol or neopentyl glycol, more preferably a diol chosen from 1,6-hexanediol or neopentyl glycol.

[0053] According to a particular embodiment, the polyol Bm) is an alkane diol whose alkylene chain is interrupted by one or more oxygen atom(s) such as, for example, diethylene glycol, triethylene glycol, polyethylene glycol,

[0054] According to a particular embodiment, the polyol Bm) is an alkane diol whose alkylene chain is interrupted by one or more ester groups such as, for example, hydroxypivalic acid neopentyl glycol ester.

[0055] According to one embodiment, the polyol Bm) may be an oligomer derived from one or more diols of the abovementioned formula (I) with a weight-average molecular mass of between 200 and 4,000 g.mol A, in particular between 300 and 3,000 g.mol '. By way of example, the compound of formula (I) is such that ALK represents a (Ci-C6)alkylene group, the oligomer then being a poly(Ci-C6)alkane diol. Mention may in particular be made of polypropane diol (also known as polypropylene glycol) with a weight-average molecular mass of between 300 and 3,000 g.mol ', or polyethylene glycol with a weight-average molecular mass of between 300 and 3,000 g.mol A

[0056] Among the dihydroxylated compounds Bm) which can be used according to the present invention, mention may in particular be made of compounds having two hydroxyl groups and a number-average molecular weight of approximately 700 to approximately 16,000, and preferably of approximately 750 to approximately 5,000. As examples of dihydroxylated compounds having a high molecular weight, mention may be made of polyol polyethers, polyhydroxylated polycarbonates, polyhydroxylated polyacetates, polyhydroxylated polyacrylates, polyhydroxylated amide polyesters, polyhydroxylated polyalkadienes, polyhydroxylated polythioethers and their mixtures. Preferably, the hydroxylated compounds are chosen from polyol polyethers, polyhydroxylated polycarbonates and mixtures thereof.

[0057] According to another particular embodiment, the polyol Bm) can be chosen from organic polyols chosen from: - triols, such as glycerol; - tetraols, such as pentaerythritol (tetramethylolmethane), erythritol, diglycerol; - pentols such as xylitol; - hexols such as sorbitol and mannitol, or dipentaerythritol or triglycerol; and mixtures thereof.

[0058] According to a particular embodiment, the polyol Bm) comprises at least one compound chosen from glycerol, pentaerythritol and / or sorbitol. In particular, the polyol Bm) may be chosen from glycerol, pentaerythritol, sorbitol and mixtures thereof, more preferably glycerol.

[0059] According to another particular embodiment, the polyol Bm) comprises at least one diol of formula (I).

[0060] According to another embodiment, the polyol Bm) is a mixture of at least one diol of formula (I) and at least one diol such as a polyether. B112) Polyacid

[0061] According to one form of the invention, the polyurethane(s) are prepared from at least one polyester polyol Bu) resulting from the reaction of at least one polyol Bm) as described previously with at least one polycarboxylic acid Bm) also referred to in the remainder of the text as “polyacid”, and optionally Bm) at least one monocarboxylic acid.

[0062] Said polyacid Bm) may be acyclic or (poly)cyclic, saturated or unsaturated, aromatic or not, linear or branched, and comprises at least two carboxyl groups -C(O)OH, in particular two to four groups -C(O)OH and more particularly two groups -C(O)OH.

[0063] It is understood that the polyester polyol Bu) can be prepared from a single polyacid or from a mixture of at least two polyacids. In the remainder of the text, unless otherwise indicated, the term "polyacid" or "polycarboxylic acid" means a single polyacid compound or a mixture of several polyacid compounds.

[0064] Said polycarboxylic acid Bm) may be more particularly chosen from linear, branched and / or cyclic, saturated or unsaturated, or even aromatic, polycarboxylic acids comprising from 2 to 54 carbon atoms, in particular from 2 to 40 and more particularly from 3 to 36 carbon atoms and comprising at least two carboxyl groups -C(O)OH, in particular from 2 to 4 carboxyl groups.

[0065] In particular, the polycarboxylic acid Bn2) may contain two carboxyl groups; this is then referred to as a dicarboxylic acid or diacid.

[0066] According to a particular embodiment, said polycarboxylic acid Bn2) may be chosen from polycarboxylic acids, in particular dicarboxylic acids, having a molecular molar mass MM less than or equal to 200 g.mol *.

[0067] Said polycarboxylic acid Bn2) is preferably chosen from oxalic acid, succinic acid, adipic acid, their optical and geometric isomers, their salts of organic or mineral bases, their solvates such as hydrates, and their mixtures, more preferably chosen from adipic acid, its optical and geometric isomers, its salts of organic or mineral bases, its solvates such as hydrates, and their mixtures.

[0068] According to another particular embodiment of the invention, the polycarboxylic acid Bii2) used to form the polyester polyol Bu) may be chosen from acids, in particular diacids, with a molecular molar mass MM greater than 200 g.mol *. In particular, the polycarboxylic acid Bn2) may be chosen from fatty acids (also called polyfatty acids), in particular dicarboxylic fatty acids (also called difatty acids), and in particular from fatty acid dimers.

[0069] The expression "fatty acid" is intended to denote a carboxylic acid comprising at least one aliphatic chain, linear or branched, preferably linear, saturated or unsaturated, which may contain at least one carbocycle, in particular one or two carbocycle(s), in particular of the mono- or polycyclic cycloalkyl type, for example cyclohexyl or decalinyl (cis or trans decalinyl). The fatty acids are C8 to C38 acids, in particular C8 to C36, in particular C10 to C34, it being understood that the number of carbons characterizing a fatty acid takes into consideration the aliphatic chain of the fatty acid and the carbon atom(s) of said carboxyl group(s). Preferably, the number of carbon atoms of the fatty acid is even.

[0070] The dicarboxylic fatty acids may be chosen from the compounds of the following formula (II), as well as their salts of organic or mineral bases, and their solvates such as hydrates: HO-C(O)-ALK'-C(O)-OH (II) in which ALK' represents an aliphatic chain as defined previously for the fatty acid, preferably C16 to C36, in particular C32 to C36, in particular C34.

[0071] Examples of dicarboxylic fatty acids include sebacic acid and fatty acid dimers. The term "fatty acid dimer" refers to the dimerization product of mono- or polyunsaturated fatty acids.

[0072] Thus, in a particular embodiment, the polyacid Bn2) comprises at least, or is even formed from, a diacid of the fatty acid dimer type.

[0073] The fatty acids from which fatty acid dimers can be prepared can be more particularly chosen from oleic acid, linoleic acid, palmitoleic acid, linolenic acid, eleostearic acid and mixtures thereof.

[0074] The polyacid Bn2) may be a dimer of fatty acids from C[8 to C38, in particular from C34 to C38 and more particularly from C36.

[0075] In particular, the fatty acid dimer may be a diacid of formula (II) above, in which ALK' represents an aliphatic chain, preferably C16 to C36, in particular C32 to C36, in particular C34, incorporating at least one carbocycle group, preferably one or two carbocycle(s), and more preferably a central carbocycle group, in particular of the mono or polycyclic cycloalkyl type, in particular cyclohexyl or decalinyl, in particular cyclohexyl.

[0076] In a particular embodiment, the polycarboxylic acid Bn2) may be a diacid of the fatty acid dimer type, containing a cycloalkyl group, in particular cyclohexyl, connected to the -C(O)-OH groups via C2 to C10, in particular C4 to C8, in particular C6 alkylene chains, said cycloalkyl group having in particular pendant C4 to C12, in particular C7 to C9, in particular C8 alkyl groups.

[0077] In particular, the fatty acid dimer may be formed from C 16 to C 20 fatty acids, in particular C 18, for example from oleic acid and / or linoleic acid.

[0078] Fatty acid dimers may be commercially available. Examples include fatty acid dimers marketed by Croda under the references Pripol®, in particular Pripol®1009, cosmetic grade, with the following structure: HO0CX ^COOH V"'" ''(CI U. U CH, in which n is an integer between 6 and 8.

[0079] According to a particular embodiment, the polyacid Bn2) may comprise, or even consist of, diacid(s) of the fatty acid dimer type, for example Pripol® 1009.

[0080] According to another embodiment, the polyacid Bn2) may comprise, or even consist of, diacid(s) having a molecular molar mass MM less than or equal to 200 g.mol *, in particular chosen from oxalic acid, succinic acid, adipic acid, and mixtures thereof. B113) Monoacid

[0081] According to one form of the invention, the polyurethane(s) are prepared from at least one polyester polyol Bu) resulting from the reaction of at least one polyol Bm) such that described previously with at least one polycarboxylic acid Bn2) as described previously, and at least one monocarboxylic acid Bn3).

[0082] The monocarboxylic acid is also called monocarboxylic acid, or “monoacid”, that is to say comprising a single carboxyl group -C(O)-OH.

[0083] The monocarboxylic acids Bn3) considered are more particularly acyclic or (poly)cyclic monocarboxylic acids, saturated or unsaturated, aromatic or not, linear or branched, comprising from 6 to 32 carbon atoms, in particular from 8 to 28 carbon atoms and more particularly from 10 to 20 carbon atoms.

[0084] It is understood that the polyester polyol Bu) can be prepared from a single monoacid Bn3) or from a mixture of at least two monoacids Bn3). In the remainder of the text, unless otherwise indicated, the term "monoacid" or "monocarboxylic acid" Bn3) thus means a single monoacid compound or a mixture of several monoacid compounds.

[0085] According to a particular embodiment, said monocarboxylic acid Bn3) is non-aromatic, saturated or unsaturated, linear or branched, cyclic or not, and comprises from 6 to 32 carbon atoms, in particular from 8 to 30 carbon atoms and more particularly from 10 to 28 carbon atoms, preferably from 12 to 26 carbon atoms, more preferably from 16 to 24 carbon atoms, even more preferably from 18 to 22 carbon atoms.

[0086] Preferably, said monoacid Bn3) is biosourced, in particular of plant origin.

[0087] When the monoacid Bn3) used is of natural origin, it may in particular consist of mixtures comprising saturated acids and unsaturated acids with conjugated and / or non-conjugated unsaturations.

[0088] According to a particular embodiment, said monocarboxylic acid Bn3) is a fatty acid, saturated or unsaturated, preferably biosourced.

[0089] According to a first particular embodiment, said monoacid Bn3) is a monocarboxylic acid comprising an aliphatic chain, linear or branched, preferably linear, saturated or unsaturated, comprising more than 10 carbon atoms, in particular more than 14 carbon atoms, in particular from 14 to 30 carbon atoms, in particular from 14 to 26 carbon atoms and more particularly from 16 to 22 carbon atoms, even more preferably from 18 to 20 carbon atoms.

[0090] As examples, a monoacid Bn3) may be chosen from isostearic acid (saturated branched C18), stearic acid (saturated linear C18), linoleic acid (polyunsaturated linear C18), arachidic acid (saturated linear C20), behenic acid (saturated linear C22) and their mixtures, as well as their geometric isomers, their salts of organic or mineral bases.

[0091] According to another particular embodiment, said monoacid Bn3) is a (poly)cyclic monocarboxylic acid, preferably polycyclic, comprising in particular a saturated and / or unsaturated, preferably unsaturated, in particular non-aromatic, mono-, bicyclic, or tricyclic fused carbocycle comprising from 5 to 20 carbon atoms, said carbocycle being optionally substituted by one or more (C i-C4)alkyl groups such as methyl. In particular, said monoacid Bn3) comprises a polycyclic carbocycle, in particular a C8-Ci4 fused tricyclic, preferably unsaturated and non-aromatic, such as a partially hydrogenated phenantrenyl group, in particular a decahydrophenantrenyl group.

[0092] It may in particular be abietic acid or one of its optical isomers, its salts of organic or mineral bases, and their solvates, such as hydrates. In particular, abietic acid may be derived from natural rosin.

[0093] According to another particular embodiment, said monoacid Bn3) may be rosin.

[0094] Rosin is a mixture comprising mainly organic acids called rosin acids of which abietic acid is the main constituent.

[0095] According to a particular embodiment, said monoacid Bn3) may comprise at least abietic acid or rosin. In particular, the monoacid Bn3) may be abietic acid or rosin. B12) Diol

[0096] According to one embodiment, the polyurethane(s) are obtained from at least one diol B[2).

[0097] According to one embodiment, the diol Bi2) is a “low molecular weight diol”, having a molecular weight of about 62 to 700, and preferably 62 to 200. These diols may comprise aliphatic, alicyclic or aromatic groups. Preferably, they comprise only aliphatic groups.

[0098] Preferably, B[2) represents a low molecular weight diol, having more than 20 carbon atoms, more preferably chosen from ethylene glycol, diethylene glycol, propane 1,2-diol, propane 1,3-diol, butane 1,4-diol, butylene 1,3-glycol, neopentyl glycol, butyl-ethyl-propane diol, cyclohexane diol, 1,4-cyclohexane dimethanol, hexane 1,6-diol, bisphenol A (2,2-bis(4-hydroxyphenyl)propane), hydrogenated bisphenol A (2,2-bis(4-hydroxycyclohexyl)propane), and mixtures thereof, even more preferably chosen from neopentyl glycol, hexane 1,6-diol, and mixtures thereof.

[0099] The low molecular weight diols may optionally comprise ionic or potentially ionic groups. Examples of low molecular weight diols containing ionic or potentially ionic groups are described in particular in US patent 3,412,054. Such compounds are preferably chosen from dimethylol butanoic acid, dimethylol propionic acid, polycaprolactone diols containing a carboxyl group and mixtures thereof.

[0100] According to another embodiment, the diol B[2) is a compound having two hydroxyl groups and a number-average molecular weight of about 700 to about 16,000, and preferably of about 750 to about 5,000. Examples of dihydroxylated compounds having a high molecular weight include polyol polyethers, polyhydroxylated polycarbonates, polyhydroxylated polyacetates, polyhydroxylated polyacrylates, polyhydroxylated amide polyesters, polyhydroxylated polyalkadienes, polyhydroxylated polythioethers and mixtures thereof. Preferably, the hydroxylated compounds are chosen from polyol polyethers, polyhydroxylated polycarbonates and mixtures thereof. In particular, polyalkylene glycols, such as polyethylene, polypropylene and / or polybutylene glycols, may be used. B2) Polyisocyanate

[0101] As indicated previously, the polyurethane(s) may be obtained from at least one polyisocyanate B2).

[0102] It is understood that the polyurethane(s) may be prepared from a single polyisocyanate or from a mixture of at least two distinct polyisocyanates. In the remainder of the text, unless otherwise indicated, the term “polyisocyanate” B2) is understood to mean a single polyisocyanate compound or a mixture of several polyisocyanates.

[0103] The polyisocyanates B2) used according to the invention may be aliphatic, cycloaliphatic or aromatic polyisocyanates capable of allowing the formation of polyurethanes.

[0104] In particular, the polyisocyanates B2) may be chosen from diisocyanates and triisocyanates, and more particularly diisocyanates.

[0105] The polyisocyanates which can be used according to the present invention are in particular chosen from organic diisocyanates having a molecular weight of approximately 112 to 1000, and preferably of approximately 140 to 400.

[0106] According to one form of the invention, the polyisocyanates B2) are chosen from diisocyanates and more particularly from those represented by the general formula R2 (NCO)2, in which R2 represents a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms, a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms. Preferably, R2 represents an organic diisocyanate.Examples of organic diisocyanates that may be chosen include tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,3-diisocyanatocyclohexane, 1,4-diisocyanatocyclohexane, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate (isophorone diisocyanate or IPDI), bis-(4-isocyanatocyclohexyl)-methane, l,3-bis(isocyanatomethyl)-cyclohexane, l,4-bis(isocyanatomethyl)-cyclohexane, . bis-(4-isocyanato-3-methyl-cyclohexyl)-methane, isomers of toluene diisocyanate (TDI) such as toluene 2,4-diisocyanate, toluene 2,6-diisocyanate and mixtures thereof, hydrogenated toluene diisocyanate, 4,4'-diphenyl methane diisocyanate and mixtures with its isomers 2,4-diphenylmethane diisocyanate and optionally 2,2'-diphenylmethane diisocyanate, naphthalene-1,5-diisocyanate, and mixtures thereof. Preferably, the diisocyanates are aliphatic and cycloaliphatic diisocyanates, and are more preferably chosen from 1,6-hexamethylene diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate, bis-(4-isocyanatocyclohexyl)-methane and mixtures thereof.

[0107] According to another form of the invention, the diisocyanates B2) may be more particularly chosen from the compounds of the following formula (III) O=C=NRN=C=O with R representing a divalent hydrocarbon group, linear or branched, acyclic or (poly)cyclic, saturated or unsaturated, aromatic or not, comprising from 2 to 20 carbon atoms, in particular from 3 to 18 carbon atoms, in particular from 5 to 16 carbon atoms and more particularly from 6 to 14 carbon atoms.

[0108] The diisocyanates may more particularly be of formula (III) above, in which R represents a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms, a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms or a divalent aromatic hydrocarbon group having from 6 to 15 carbon atoms.

[0109] The diisocyanate(s) B2) that can be used are advantageously chosen from tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,3-diisocyanatocyclohexane, 1,4-diisocyanatocyclohexane, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate (isophorone diisocyanate or IPDI), bis-(4-isocyanatocyclohexyl)-methane, 1,3-bis(isocyanatomethyl)-cyclohexane, 1,4-bis(isocyanatomethyl)-cyclohexane, bis-(4-isocyanato-3-methyl-cyclohexyl)-methane, isomers of toluene diisocyanate (TDI) such as 2,4-diisocyanate toluene, 2,6-toluene diisocyanate and mixtures thereof, hydrogenated toluene diisocyanate, 4,4'-diphenylmethane diisocyanate and mixtures with its isomers 2,4-diphenylmethane diisocyanate and optionally 2,2'-diphenylmethane diisocyanate, naphthalene-1,5-diisocyanate, and mixtures thereof.Preferably, the diisocyanate(s) are chosen from aliphatic and cycloaliphatic diisocyanates.

[0110] More particularly, a single polyisocyanate is used, in particular a single diisocyanate. In particular, the polyisocyanate B2) may be the isocyanate of 3-isocyanatomethyl-3,5,5-trimethylcyclohexane, also called isophorone diisocyanate (IPDI) or the bis(4,4'-isocyanatocyclohexyl)methane isomers or hexamethylene diisocyanate. B 3) Hydrophilic monomer

[0111] As indicated above, the polyurethane(s) may be obtained from at least one hydrophilic monomer B3) chosen from B3[) compounds carrying an acid function, for example a carboxylic function, or a basic function, for example a primary, secondary or tertiary amine function, and further comprising at least one hydroxyl function, preferably at least two hydroxyl functions, in particular two hydroxyl functions such as 2,2-bis(hydroxymethyl)propionic acid or B32) at least one diamine compound of formula H2N-R5-NH2 (Xa) in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or of formula H2N-R6 -NHR7 (Xb) in which R6 represents an alkylene radical and R7 represents an alkyl radical substituted by one or more ionic or potentially ionic groups.

[0112] By) Compounds carrying an acid, or basic, and hydroxyl function

[0113] According to one form of the invention, the polyurethane(s) are obtained from at least one hydrophilic monomer B3) chosen from B3[) the compounds carrying an acid function or a basic function and further comprising at least one hydroxyl function.

[0114] These hydrophilic compounds B3[) may be compounds carrying an acid function, for example a carboxylic function, or a basic function, for example a primary, secondary or tertiary amine function, and further comprising at least one hydroxyl function, preferably at least two hydroxyl functions, in particular two hydroxyl functions.

[0115] The polyurethane(s) may be obtained from a single hydrophilic monomer B3i) or from a mixture of at least two hydrophilic monomers B3[), preferably from a single hydrophilic monomer B3J.

[0116] The acid (respectively basic) functions of the hydrophilic monomers B3[) can optionally be neutralized, partially or totally, by a base (respectively an acid), preferably organic.

[0117] Said hydrophilic compound(s) B3[) may be more particularly chosen from: compounds of formula (IV) R”-C(O)-OH in which R” represents a linear or branched, saturated or unsaturated, C1 to C10 alkyl group, substituted by one or more hydroxyl groups.

[0118] Preferably, R” represents a branched, saturated, C1 to C8, in particular C1 to C6, alkyl group substituted by one or more hydroxyl groups, in particular by 1 with 4 hydroxyl groups, in particular by at least two hydroxyl groups, in particular by 2 to 4 hydroxyl groups, for example by two hydroxyl groups. As an example of a compound of formula (IV), mention may be made of 2,2-bis(hydroxymethyl)propionic acid (DMPA);

[0119] Said hydrophilic compound(s) B3[) may also be chosen from the compounds of formula (V) R1R2R3N in which R, R2 and R3 represent, independently of each other, a linear or branched, saturated or unsaturated, C1 to C10 alkyl chain, optionally substituted by one or more hydroxyl groups, or a hydrogen atom, it being understood that at least one of Rb, R2 and R3 is other than a hydrogen atom and carries at least one hydroxyl group. Examples of compounds of formula (V) include N-methyldiethanolamine or N-tertbutyldiethanolamine.

[0120] According to a first embodiment variant, the hydrophilic monomer(s) B31) are of formula (IV) above. In the context of this variant, said hydrophilic monomer(s) may more particularly be of formula (IV) in which R” represents a branched, saturated C1 to C10, in particular C1 to C8 and more particularly C1 to C6 alkyl chain, substituted by one or more hydroxyl groups.

[0121] According to one embodiment, a single hydrophilic monomer of formula (IV) above, in particular as defined above, is used. In particular, it may be 2,2-bis(hydroxymethyl)propionic acid (DMPA).

[0122] According to another embodiment variant, the hydrophilic monomer(s) B3[) used are of formula (V) above. In the context of this variant, said hydrophilic monomer(s) may more particularly be of formula (V), in which R1, R2 and R3 represent, independently of one another, a linear or branched, saturated or unsaturated, C1 to C10 alkyl chain, optionally substituted by one or more hydroxyl groups, or a hydrogen atom, provided that at least one of the R2 and R3 RBs is other than a hydrogen atom and carries at least one hydroxyl group.

[0123] According to one embodiment, a single hydrophilic monomer B31) of formula (V) above, in particular as defined above, is used. In particular, it may be N-methyldiethanolamine or N-tertbutyldiethanolamine.

[0124] The polyurethane(s) obtained from at least one additional hydrophilic monomer are advantageously neutralized, totally or partially, by adding a base or an acid (neutralizing agent), depending on the nature of the functions (acidic or basic) of the hydrophilic monomer(s) entering into the composition of the polyurethane(s). It is up to the person skilled in the art to adjust the quantity of neutralizing agent to be introduced into the reaction medium to obtain the desired neutralization.

[0125] In particular, a percentage of neutralization of the polyurethane(s) as described above may be greater than or equal to 70%, in particular between 70 and 100%. The percentage of neutralization represents the percentage of acid (respectively basic) functions of the polyurethane polymer neutralized (in salt form). It may be evaluated relative to the quantity of neutralization agent added.

[0126] Thus, the hydrophilic monomer B3i) can be chosen from the compounds of formula (IV) and (V) mentioned above in which the acid or basic functions are preferably neutralized, totally or partially, by adding a base or an acid, preferably organic.

[0127] In particular, in the polyurethane(s) obtained from at least one additional hydrophilic monomer of formula (IV) above, the acid functions of the monomeric units may be in neutralized form, totally or partially, by an organic or mineral base, preferably organic, in particular chosen from primary, secondary or tertiary amines, which may or may not comprise substituents, for example hydroxyl groups, such as for example amino-2-methyl-2-propanol, and the salified forms thereof.

[0128] According to a particular embodiment, the polyurethane(s) obtained from at least one additional hydrophilic monomer of formula (IV) above, may be neutralized by a tertiary amine such as diisopropylethylamine.

[0129] Other bases can also be used, such as potash, soda or ammonia.

[0130] In the polyurethane(s) obtained from at least one additional hydrophilic monomer of formula (V) above, the amine functions of the monomeric units may advantageously be in neutralized form, totally or partially, by an organic or mineral acid, preferably organic. As examples, hydrochloric acid, acetic acid or tartaric acid may be mentioned.

[0131] According to a particular embodiment, the polyurethane(s) are prepared from at least one hydrophilic monomer, in particular a single hydrophilic monomer, of formula (IV) above, and more particularly 2,2-bis(hydroxymethyl)propionic acid (DMPA), the acid functions being advantageously, totally or partially, neutralized, preferably by an organic base, in particular by a tertiary amine such as diisopropylethylamine. B32) Diamines H2N-R5-NH2 (Xa) or H2N-R6-NHR7 (Xb)

[0132] According to one form of the invention, the polyurethane(s) are obtained from at least one hydrophilic monomer B3) chosen from diamine compounds B32) of formula H2N-R5-NH2 (Xa) in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or of formula H2N-R6 -NHR7 (Xb) in which R6 represents an alkylene radical and R7 represents a radical alkyl substituted by one or more ionic or potentially ionic groups.

[0133] The ionic or potentially ionic group(s) are preferably chosen from ternary or quaternary ammonium groups or groups convertible into such groups, the carboxyl group, the carboxylate group, the sulfonic acid group, the sulfonate group, and mixtures thereof, more preferably from the sulfonic acid group, the sulfonate group, and mixtures thereof.

[0134] According to a preferred form of the invention, the ionic group denotes a sulfonic acid group partially or totally neutralized by a base, preferably mineral, such as sodium hydroxide.

[0135] According to a preferred embodiment of the invention, the polyurethane(s) are obtained from at least one hydrophilic monomer B3) chosen from the diamine compounds B32) of formula (Xb) as defined above.

[0136] The diamines of formula (Xb) are preferably chosen from diaminosulfonates, such as the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid (ASA), the sodium salt of N-(2-aminoethyl)-2-aminopropionic acid, and mixtures thereof. More preferably, the diamine of formula (Xb) is the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid (ASA).

[0137] According to a preferred form of the invention, when diamines B32) are used in the preparation of the polyurethane(s), amines B4) are also used.

[0138] Unsubstituted amino compound with ionic or potentially ionic eroune(s)

[0139] According to one embodiment, the polyurethane(s) are capable of being obtained from B4) at least one amine compound which is not substituted by one or more ionic or potentially ionic groups.

[0140] According to one embodiment, said amine compound not substituted by an ionic or potentially ionic group is a diamine compound.

[0141] According to one embodiment, the diamine compound not substituted by an ionic or potentially ionic group is a compound of formula H2N-R4-NH2 (XI) in which R4 represents an alkylene or alkylene oxide radical which is not substituted by one or more ionic or potentially ionic groups.

[0142] The diamines of formula (XI) are preferably selected from alkylene diamines, such as hydrazine, ethylenediamine, propylenediamine-1,2, propylenediamine-1,3, 1,4-butylenediamine, 1,6-diamino hexane, piperazine; alkylene oxide diamines, such as 3-{2-[2-(3-aminopropoxy)ethoxy]-ethoxy}propylamine (also called dipropylamine diethylene glycol or DPA-DEG ​​available from Tomah Products, Milton, Wis.), 2-methyl-1,5-pentanediamine (Dytec A from DuPont), hexane diamine, isophorone diamine, 4,4-methylenedi- (cyclohexylamine), DPA series ether amines available from Tomah Products, Milton, Wis., such as dipropylamine propylene glycol, dipropylamine di-propylene glycol, dipropylamine tripropylene glycol, dipropylamine poly(propylene glycol), dipropylamine ethylene glycol, dipropylamine poly(ethylene glycol), dipropylamine 1,3-propane diol, dipropylamine 2-methyl-1,3-propane diol, dipropylamine 1,4-butane diol, dipropylamine 1,3-butane diol, dipropylamine 1,6-hexane diol and dipropylamine cyclohexane-1,4-dimethanol; and mixtures thereof.

[0143] The diamines of formula (XI) are more preferably chosen from ethylenediamine, isophorone diamine, and their mixtures.

[0144] The amino compounds B4) may also designate isophorone diamine, mixtures of 2, 2,4- and 2,4,4-trimethylhexamethylenediamine, 2-methylpentamethylenediamine, diethylenetriamine, 4,4-diaminodicyclohexylmethane, hydrazine hydrate and / or dimethylethyl-nediamine.

[0145] According to one embodiment, the amine compound B4) denotes a compound comprising a primary and / or secondary amine and a hydroxyl group such as diethanolamine, 3-amino-l-methylaminopropane, 3-amino-l-ethylaminopropane, 3-amino-l-cyclohexylaminopropane, 3-amino-l-methylaminobutane, alkanolamines such as N-aminoethylethanolamine, ethanolamine, 3-aminopropanol, neopentanolamine.

[0146] According to one embodiment, the amine compound B4) denotes methylamine, ethylamine, propylamine, butylamine, roctylamine, laurylamine, stearylamine, isononyloxypropylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, N-methylaminopropylamine, diethyl (methyl)aminopropylamine, morpholine or piperidine,

[0147] According to a particular embodiment, the amine compound B4) is chosen from ethylenediamine, bis(4-aminocyclohexyl)methane, 1,4-diaminobutane, isophoronediamine, ethanolamine, diethanolamine and diethylenetriamine.

[0148] According to a preferred form of the invention, when diamines B4) are used in the preparation of the polyurethane(s), amines B32) as described previously are also used.

[0149] According to one embodiment, when one or more amines B4) are used in the preparation of the polyurethane(s), these preferably comprise one or more amines of formula (XI).

[0150] According to a particular embodiment, when one or more amines B4) are used in the preparation of the polyurethane(s), the amine(s) B4) preferably comprise one or more diamines preferably of formula (XI), the or polyurethanes also being produced from the use of one or more hydrophilic compounds B32).

[0151] According to a first variant, the polyurethane(s) are formed from: Bii) from 50 to 95% by weight, in particular from 60 to 90% by weight, in particular from 70 to 85% by weight, in particular from 75 to 80% by weight, of a polyester polyol Bu) as defined above, said polyester polyol being for example formed from at least: Bin) glycerol; Bn2) a dimer of C[8 to C38 fatty acid, in particular C34 to C38 and more particularly C36, for example that marketed by the company Croda, under the reference Pripol®1009, of cosmetic grade; and Bn3) abietic acid or rosin; B2) from 5 to 50% by weight, in particular from 5 to 40% by weight, in particular from 10 to 30% by weight and more particularly from 15 to 20% by weight, of at least one polyisocyanate, in particular as defined above, in particular a diisocyanate such as isophorone diisocyanate; and, B3[) from 2 to 15% by weight, in particular from 3 to 10% by weight and more particularly from 3 to 5% by weight, of at least one hydrophilic monomer as defined above, in particular a single hydrophilic monomer as defined above; the acid or basic functions of said hydrophilic monomer being advantageously, totally or partially, neutralized; said hydrophilic monomer being for example 2,2-bis(hydroxymethyl)propionic acid (DMPA) with the acid functions being advantageously, totally or partially, neutralized, preferably by an organic base, in particular by a tertiary amine such as diisopropylethylamine;the mass percentages being defined in relation to the total weight of the components of the polyurethane(s).;

[0152] Preferably, the polyurethane(s) do not comprise any monomeric unit other than those derived from the aforementioned components Bu), B2), B3[). In other words, according to a particular embodiment, the sum of the mass contents of components Bu), B2), B3i), is equal to 100%.

[0153] According to a second variant, the polyurethane(s) are formed from B[2) at least one diol, Bu) optionally at least one polyester polyol (in particular polyester polyol by reaction between hexandiol / neopentyl glycol and adipic acid), B2) at least one polyisocyanate, B32) and B4) at least one hydrophilic monomer (such as sodium N-(2-aminoethyl)-2-aminoethane sulfonate) and at least one amine compound.

[0154] More particularly, the polyurethane(s) usable in the present invention are derived from the reaction of: • at least one prepolymer of the following formula (VI): (VI) Formula (VI) in which: - Ri represents a bivalent radical of a dihydroxylated compound, - R2 represents a radical of an aliphatic or cycloaliphatic polyisocyanate, - R3 represents a radical of a low molecular weight diol, optionally substituted by one or more ionic groups, - n represents an integer ranging from 1 to 5, and - m is greater than 1; • at least one chain extender according to the formula H2N-R4-NH2 (VII), in which R4 represents an alkylene or alkylene oxide radical which is not substituted by one or more ionic or potentially ionic groups; and • at least one chain extender according to the formula H2N-R5-NH2 (VIIIa) in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or according to the formula H2N-R6-NHR7 (VIIIb), in which R6 represents an alkylene radical and R7 represents an alkyl radical substituted by one or more ionic or potentially ionic groups.

[0155] Among the dihydroxylated compounds that can be used according to the present invention, mention may in particular be made of compounds having two hydroxyl groups and a number-average molecular weight of approximately 700 to approximately 16,000, and preferably of approximately 750 to approximately 5,000. As examples of dihydroxylated compounds having a high molecular weight, mention may be made of polyol polyesters, polyol polyethers, polyhydroxylated polycarbonates, polyhydroxylated polyacetates, polyhydroxylated polyacrylates, polyhydroxylated amide polyesters, polyhydroxylated polyalkadienes, polyhydroxylated polythioethers and mixtures thereof. Preferably, the hydroxylated compounds are chosen from polyol polyesters, polyol polyethers, polyhydroxylated polycarbonates and mixtures thereof.

[0156] The polyisocyanates B2) which can be used according to the present invention are in particular chosen from organic diisocyanates having a molecular weight of approximately 112 to 1000, and preferably of approximately 140 to 400.

[0157] Preferably, the polyisocyanates are chosen from diisocyanates and more particularly from those represented by the general formula (IX) R2(N=C=O)2, in which R2 represents a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms, a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms.

[0158] Preferably, (IX) represents an organic diisocyanate. Examples of organic diisocyanates that may be chosen include tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,3-diisocyanatocyclohexane, 1,4-diisocyanatocyclohexane, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate (isophorone diisocyanate or IPDI), bis-(4-isocyanatocyclohexyl)-methane, l,3-bis(isocyanatomethyl)-cyclohexane, l,4-bis(isocyanatomethyl)-cyclohexane, bis-(4-isocyanato-3-methyl-cyclohexyl)-methane, isomers of toluene diisocyanate (TDI) such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate and mixtures thereof, hydrogenated toluene diisocyanate, 4,4'-diphenylmethane diisocyanate and mixtures with its isomers 2,4-diphenylmethane diisocyanate and optionally 2,2'-diphenylmethane diisocyanate, naphthalene-1,5-diisocyanate, and mixtures thereof.

[0159] Preferably, the diisocyanates (IX) are aliphatic and cycloaliphatic diisocyanates, and are more preferably chosen from 1,6-hexamethylene diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate, bis-(4-isocyanatocyclohexyl)-methane and mixtures thereof.

[0160] By "low molecular weight diol" is meant, according to the present invention, a diol having a molecular weight of about 62 to 700, and preferably of 62 to 200. These diols may comprise aliphatic, alicyclic or aromatic groups. Preferably, they comprise only aliphatic groups.

[0161] Preferably, B^) represents a low molecular weight diol, having more than 20 carbon atoms, more preferably chosen from ethylene glycol, diethylene glycol, propane 1,2-diol, propane 1,3-diol, butane 1,4-diol, butylene 1,3-glycol, neopentyl glycol, butyl-ethyl-propane diol, cyclohexane diol, 1,4-cyclohexane dimethanol, hexane 1,6-diol, bisphenol A (2,2-bis(4-hydroxyphenyl)propane), hydrogenated bisphenol A (2,2-bis(4-hydroxycyclohexyl)propane), and mixtures thereof.

[0162] The low molecular weight diols may optionally comprise ionic or potentially ionic groups. Examples of low molecular weight diols containing ionic or potentially ionic groups are described in particular in US patent 3,412,054. Such compounds are preferably chosen from dimethylol butanoic acid, dimethylol propionic acid, polycaprolactone diols containing a carboxyl group and mixtures thereof.

[0163] The prepolymer is extended using two families of chain extenders. The first family of chain extenders corresponds to compounds of general formula H2N-R4-NH2 (VII), in which R4 represents an alkylene or oxide radical of alkylene which is not substituted by one or more ionic or potentially ionic groups.

[0164] The chain extenders of formula (VII) are preferably selected from alkylene diamines, such as hydrazine, ethylenediamine, propylenediamine, 1,4-butylenediamine, piperazine; alkylene oxide diamines, such as 3-{2-[2-(3-aminopropoxy)ethoxy]-ethoxy}propylamine (also called dipro-pylamine diethylene glycol or DPA-DEG ​​available from Tomah Products, Milton, Wis.), 2-methyl-1,5-pentanediamine (Dytec A from DuPont), hexane diamine, isophorone diamine, 4,4-methylenedi-(cyclohexylamine), ether amines of the DPA series available from Tomah Products, Milton, Wis., such as dipropylamine propylene glycol, dipropylamine dipropylene glycol, dipropylamine tripropylene glycol, dipropylamine poly(propylene glycol), dipropylamine ethylene glycol, dipropylamine poly(ethylene glycol), dipropylamine 1,3-propane diol, dipropylamine 2-methyl-1,3-propane diol, dipropylamine 1,4-butane diol, dipropylamine 1,3-butane diol, dipropylamine 1,6-hexane diol and dipropylamine cyclohexane-1,4-dimethanol; and mixtures thereof.

[0165] The second family of chain extenders corresponds to compounds of general formula H2N-RS-NH2 (VIIIa), in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or of general formula H2N-R6-NHR7 (VIIIb), in which R6 represents an alkylene radical and R7 represents an alkyl radical substituted by one or more ionic or potentially ionic groups.

[0166] The ionic or potentially ionic group may preferably be selected from ternary or quaternary ammonium groups or groups convertible into such groups, a carboxyl group, a carboxylate group, a sulfonic acid group and a sulfonate group.

[0167] The chain extenders of formula (VIIIb) are preferably chosen from di-aminosulfonates, such as for example the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid (ASA), the sodium salt of N-(2-aminoethyl)-2-aminopropionic acid, and mixtures thereof.

[0168] The polyurethane(s) usable according to the present invention may optionally further comprise compounds which are respectively located at the ends of the chains and terminate said chains (chain terminators). Such compounds are described in particular in patents US 7,445,770 and / or US 7,452,770.

[0169] Preferably, the polyurethane(s) usable according to the present invention are in the form of a polyurethane latex(s).

[0170] By "polyurethane latex" is meant an aqueous dispersion of polyurethane(s) as defined above; the terms “polyurethane polymer latex(es)” and “polyurethane latex(es)” are equivalent.

[0171] Preferably, the aqueous dispersion of polyurethane particles has a viscosity of less than 2000 mPa.s at 23°C, more preferably less than 1500, and better still less than 1000. Even more preferably, the aqueous dispersion of polyurethane has a glass transition temperature of less than 0°C.

[0172] Also preferably, the aqueous dispersion of polyurethane(s) has a solids content (or active material, or dry matter) based on the weight of the dispersion of 20% to 60% by weight, more preferably 25% to 55% by weight and better still 30% to 50% by weight. This means that the content of polyurethane(s) (dry matter) in the aqueous dispersion is preferably 20% to 60% by weight, more preferably 25% to 55% by weight and better still 30% to 50% by weight, relative to the total weight of the dispersion.

[0173] Also preferably, the aqueous dispersion of polyurethane(s) has a glass transition temperature (Tg) equal to or less than -25°C, preferably less than -35°C, and more preferably less than -40°C.

[0174] The polyurethane particles may have an average diameter of up to about 1000 nm, for example from about 50 nm to about 800 nm, more preferably from about 100 nm to about 500 nm. These particle sizes may be measured with a laser particle size analyzer (for example Brookhaven BI90).

[0175] According to one variant, the polyurethane(s) are derived from: • B2) at least one aliphatic, araliphatic and / or cycloaliphatic polyisocyanate preferably chosen from HDI, IPDI, H12-MDI and their mixture; • at least one polyol with a number-average molar mass Mn > 330 and • < 6000 g / mol, preferably > 350 and < 5000 g / mol, preferably Bu) at least one polyester polyol preferably derived from at least one diacid chosen from succinic acid, adipic acid and at least one diol chosen from 1, 6 hexanediol, 1,4-butanediol and / or at least neopentyl glycol, and B[2) at least one polyether polyol; • optionally at least one amino compound B4) comprising at least two amino groups such as ethylenediamine, which can react with isocyanate functions, • optionally at least one hydrophilic monomer B3) chosen from compounds B32) as described previously, in particular chosen from compounds substituted by an acidic ionic group such as 2-(2-aminoethylamino)ethanesulfonic acid or its salts such as its sodium salts; • optionally at least one alcohol comprising at least two hydroxy functions Bi2) and with a molar mass > 62 and < 399 g / mol, • e) optionally at least one compound of which one function is reactive with isocyanates.

[0176] According to a preferred embodiment of the invention, the polyurethane(s) of the invention are chosen from polyurethanes with the following INCI names: polyurethane-32, polyurethane-34, polyurethane-35, polyurethane-48, polyurethane-93, and polyurethane-99, and mixtures thereof.

[0177] According to a more preferred embodiment of the invention, the polyurethane(s) of the invention are chosen from polyurethanes with the following INCI names: polyurethane-34, polyurethane-35, polyurethane-48, and mixtures thereof.

[0178] According to an even more preferred embodiment of the invention, the polyurethane of the invention is the polyurethane with the following INCI name: polyurethane-48.

[0179] As a non-limiting example of aqueous dispersions of polyurethane(s) which can be used according to the present invention, mention may be made of those sold under the name Baycusan® by Covestro such as, for example, Baycusan® Cl000 (INCI name: polyurethane-34), Baycusan® C1001 (INCI name: polyurethane-34), Baycusan® C1003 (INCI name: polyurethane-32), Baycusan® C1004 (INCI name: polyurethane-35), Baycusan® C1008 or C1008 / 1 (INCI name: polyurethane-48), Baycusan® eco E1000 (INCI name: polyurethane-93) or Baycusan® eco E1001 (INCI name: polyurethane-99). Composition (C)

[0180] According to one embodiment, the polyurethane(s) are included in a composition (C).

[0181] Composition (C) preferably comprises a total polyurethane content ranging from 0.05% to 5% by weight, more preferably ranging from 0.1% to 3% by weight, even more preferably ranging from 0.2% to 1.5% by weight, relative to the total weight of composition (C).

[0182] Composition (C) is a cosmetic composition, i.e. which comprises a cosmetically acceptable medium, i.e. a medium compatible with human keratin fibers.

[0183] Composition (C) is preferably an aqueous composition. According to a preferred embodiment, composition (C) comprises a total water content ranging from 60% to 99.95% by weight, preferably ranging from 70% to 99.5% by weight, more preferably ranging from 80% to 99% by weight relative to the total weight of composition (C).

[0184] According to a particular embodiment, the composition (C) further comprises one or more organic solvents chosen from monoalcohols having from 1 to 5 carbon atoms such as ethanol and isopropanol, glycols having from 2 to 8 carbon atoms such as ethylene glycol, propylene glycol, 1,3-butylene glycol and di- propylene glycol, C3 and C4 ketones and C2-C4 aldehydes, more preferably chosen from monoalcohols having from 1 to 5 carbon atoms such as ethanol and isopropanol, even more preferably composition (C) comprises ethanol.

[0185] Composition (C) may be in any of the galenic forms conventionally used for hair application. In a non-limiting manner, composition (C) may be in the form of a lotion, a cream, a mousse, a gel, a spray or a lacquer.

[0186] Preferably, composition (C) is used in a leave-in application.

[0187] According to a preferred embodiment, composition (C) comprises a total content in coloring agents less than 0.1% by weight, preferably less than 0.01% by weight, more preferably less than 0.001% by weight relative to the total weight of the composition, even more preferably, the composition is free of coloring agents.

[0188] By "coloring agent" is meant an oxidation dye, a direct dye or a pigment.

[0189] By "oxidation dye" is meant an oxidation dye precursor chosen from oxidation bases and couplers. Oxidation bases and couplers are compounds with little or no color which, by a condensation reaction in the presence of an oxidizing agent, give a colored species.

[0190] By "direct dye" is meant a natural and / or synthetic dye, including in the form of extract(s), different from oxidation dyes. These are colored compounds which will diffuse superficially on the fiber. They can be ionic or non-ionic, i.e. anionic, cationic, neutral or non-ionic.

[0191] According to a preferred embodiment, the composition (C) comprises a total silicone content of less than 0.1% by weight, preferably less than 0.01% by weight, more preferably less than 0.001% by weight relative to the total weight of the composition, even more preferably, the composition (C) is free of silicones. Hair treatment process

[0192] According to a second aspect, the subject of the present invention is a method for treating hair comprising the application to the hair of the polyurethane(s) as defined above or of the composition (C) as defined above comprising the polyurethane(s), close to the roots, preferably at least over an area of ​​between 0 and 10 cm measured relative to the surface of the scalp, more preferably at least over an area of ​​between 0 and 5 cm measured relative to the surface of the scalp.

[0193] The polyurethane(s) as defined above or the composition (C) as as defined above are preferably applied to dry hair.

[0194] The method preferably further comprises a drying step carried out after the step of applying to the hair the polyurethane(s) as defined above or the composition (C) as defined above comprising the polyurethane(s). The drying step is preferably carried out using a heating device, more preferably using a hair dryer. Examples

[0195] The following examples allow a better understanding of the invention without, however, being limiting in nature.

[0196] Example 1: Measurements of root detachment on malleable heads

[0197] The composition Cl according to the invention was prepared from the contents indicated in the table below. The contents are expressed as a percentage by weight, relative to the total weight of the composition CL

[0198] [Tableauxl] Ingredients Cl Polyurethane-48 (Baycusan ® C1008 / 1 Marketed by Covestro) 1 (0.3 MA) Water Qsp 100

[0199] MA: Active Matter Application and evaluation protocol

[0200] The study consists of treating malleable heads and then measuring the detachment of the roots at the level of the central lines.

[0201] Three malleable heads (Suky model, 180 hairs / cm2, growth angle: 45° available on www.shop-hair.com) were washed, combed and dried upside down. 2.2 g of composition Cl were applied using a pipette to the roots of the first head and 2 g of Elnett brand hairspray from L'Oréal were applied to the roots of the second head and then both heads were combed and dried using a hairdryer, upside down. The third head was not treated.

[0202] Root detachment measurements were carried out several times as indicated in the table below.

[0203] In order to evaluate the root lifting effect, two types of measurements were carried out: a measurement of the horizontal distance between the side of the hair to the right of the central parting and the side of the hair to the left of the central parting measured 1 cm above the height of the eyebrows and a measurement of the height of the hair at the top of the head, at the level of the central parting. The higher the measured value, the better the root detachment effect.

[0204] When indicated in the table "15 right / left movements", this means that the heads were moved 15 times from right to left in order to simulate the natural movements of the human head.

[0205] Where "X h RH 80%" is indicated, this means that the heads were placed in a hygrometry-controlled glove box (80% relative humidity) for X hours to assess the humidity resistance of the root-stripping effect. Evaluation results Time of measurement Width measured at 1 cm from the eyebrows Head 1 (Comparative) Head 2 Composition Cl (Invention) Head 3 No treatment (Control) Before application 7 9 8 After application 10.5 11 N / A After application + 15 right / left movements 8 11 N / A After application + 15 right / left movements + 30 min HR 80% 8 11 2.5 After application + 15 right / left movements + 1 h HR 80% 8 10.5 0.5 After application + 15 right / left movements + 44 h HR 80% 7.5 10 N / A After application + 15 right / left movements + 44 h HR 80% + 15 right / left movements 7.5 10 N / A Time of measurement Height measured at the top of the head Head 2 Composition Cl (Invention) Head 3 No treatment (Control) Before application 4 4 After application 4 N / A After application + 15 right / left movements 4 N / A After application + 15 right / left movements + 30 min HR 80% 4 N / A After application + 15 right / left movements + 1 h HR 80% 4 N / A After application + 15 right / left movements + 44 h HR 80% 4 N / A After application + 15 right / left movements + 44 h HR 80% + 15 right / left movements 4 N / A

[0208] The malleable head 2 on which the composition Cl according to the invention has been applied has a visible clearance of the forehead and therefore hair which does not fall despite movements of the head and high humidity. The use of a polyurethane according to the invention therefore makes it possible to add volume to the hair near the roots by a root lifting effect. The observed effect is particularly resistant to humidity and even better than that obtained with lacquer.

[0209] Example 2: Evaluation of the persistence of the root detachment effect when shampooed Application and evaluation protocol

[0210] Three malleable heads numbered 4, 5 and 6 (Suky model, 180 hairs / cm2, growth angle: 45° available on www.shop-hair.com) were washed once with DOP brand shampoo (7g of shampoo), rinsed under water for 2 minutes then combed.

[0211] Head 4 was then dried using a hairdryer, upside down, then turned right side up before applying 3g of L'Oréal Elnett brand hairspray to the roots.

[0212] 3 g of the composition Cl according to example 1 were then applied using a pipette at the roots of head 5 then head 5 was combed and dried using a hair dryer, head down.

[0213] No composition is then applied to the head 6. This has been combed and dried using a hair dryer, head down.

[0214] The three heads 4 to 6 were then washed with a DOP brand shampoo (7g of shampoo), rinsed under water for 2 minutes then combed and dried using a hair dryer, head down.

[0215] In order to evaluate the root lifting effect, a measurement of the horizontal distance between the side of the hair to the right of the central parting and the side of the hair to the left of the central parting measured 1 cm above the eyebrow height was then carried out. The greater the measured value, the better the root lifting effect.

[0216] When indicated in the table "15 right / left movements", this means that the heads were moved 15 times from right to left in order to simulate the natural movements of the human head.

[0217] Where indicated "24 h RH 80%", this means that the heads were placed in a humidity-controlled glove box (80% relative humidity) for 24 hours to evaluate the humidity resistance of the root-stripping effect. Evaluation results Moment of Width measured at 1 cm from the eyebrows measurement Head 4 (Comparative) Head 5 Composition Cl (Invention) Head 6 No treatment (Control) After application + 1 shampoo 9 10 9 After application + 1 shampoo + 15 right / left movements + 24 h HR 80% 2 7 N / A

[0219] The malleable head 5 on which the composition Cl according to the invention has been applied has a visible clearance of the forehead and therefore hair which does not fall despite shampooing, movements of the head and high humidity. The use of a polyurethane according to the invention therefore makes it possible to add volume to the hair near the roots by a root lifting effect. The observed effect is particularly resistant to humidity after shampooing and even better than that obtained with hairspray.

Claims

Claims

1. Use of one or more polyurethanes or of a composition (C) comprising the polyurethane(s) for providing volume to the hair, in particular near the roots by a root lifting effect, the polyurethane(s) being capable of being obtained from: Bi) at least one polyol chosen from: ■ Bu) a polyester polyol resulting from the reaction of: 3 at least one polyol Bm) with 3 at least one polycarboxylic acid Bn2) and 3 optionally Bn3) at least one monocarboxylic acid; ■ B i2) a diol; and ■ the mixture of Bu) and B12); and B2) at least one polyisocyanate, preferably a diisocyanate, in particular aliphatic or cycloaliphatic and mixtures thereof;and B3) at least one hydrophilic monomer chosen from: ■ B3i) compounds carrying an acid function, in particular carboxylic, or a basic function, in particular primary, secondary or tertiary amine, and further comprising at least one hydroxyl function, preferably at least two hydroxyl functions, in particular two hydroxyl functions such as 2,2-bis(hydroxymethyl)propionic acid and ■ B32) diamine compounds of formula H2N-R5-NH2 (Xa) in which Rs represents an alkylene radical substituted by one or more ionic or potentially ionic groups or of formula H2N-R6 -NHR7 (Xb) in which R6 represents an alkylene radical and R7 represents an alkyl radical substituted by one or more ionic or potentially ionic groups; and B4) optionally at least one amino compound which is not substituted by one or more ionic or potentially ionic groups.;

2. Use according to the preceding claim, in which the polyol Bi) is a polyester polyol Bu) as defined in claim 1.

3. Use according to any one of the preceding claims, in which the polyol Bm) is a diol of formula HO-ALK-OH (I) in which ALK represents a linear or branched CrCi8, in particular CrC8, alkylene group, preferably a diol chosen from ethylene glycol, butylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol or neopentyl glycol, more preferably a diol chosen from 1,6-hexanediol or neopentyl glycol.

4. Use according to any one of the preceding claims, in which the polycarboxylic acid Bn2) is chosen from linear, branched and / or cyclic, saturated or unsaturated, or even aromatic, polycarboxylic acids comprising from 2 to 54 carbon atoms, in particular from 2 to 40 and more particularly from 3 to 36 carbon atoms and comprising at least two carboxyl groups -C(O)OH, in particular from 2 to 4 carboxyl groups, preferably chosen from oxalic acid, succinic acid, adipic acid, their optical, geometric isomers, their salts of organic or mineral bases, their solvates such as hydrates, and their mixtures, more preferably chosen from adipic acid, its optical, geometric isomers, its salts of organic or mineral bases, its solvates such as hydrates, and their mixtures.

5. Use according to claim 1, wherein the polyol B i) is a diol B i2) as defined in claim 1.

6. Use according to claim 1 or 5, wherein the diol B[2) is selected from ethylene glycol, diethylene glycol, propane 1,2-diol, propane 1,3-diol, butane 1,4-diol, butylene 1,3-glycol, neopentyl glycol, butyl-ethyl-propane diol, cyclohexane diol, 1,4-cyclohexane dimethanol, hexane 1,6-diol, bisphenol A (2,2-bis(4-hydroxyphenyl)propane), hydrogenated bisphenol A (2,2-bis(4-hydroxycyclohexyl)propane), and mixtures thereof, more preferably from neopentyl glycol, hexane 1,6-diol, and mixtures thereof.

7. Use according to any one of the preceding claims, in which the polyisocyanate B2) is chosen from the compounds of the following formula (III) O=C=NRN=C=O with R representing a divalent hydrocarbon group, linear or branched, acyclic or (poly)cyclic, saturated or unsaturated, aromatic or not, comprising from 2 to 20 carbon atoms, in particular from 3 to 18 carbon atoms, in particular from 5 to 16 carbon atoms and more particularly from 6 to 14 carbon atoms, preferably from 1,6-hexamethylene diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexane isocyanate, bis-(4-isocyanatocyclohexyl)-methane, and mixtures thereof.

8. Use according to any one of the preceding claims, wherein the hydrophilic monomer B3) is chosen from the diamine compounds B32) as defined in claim 1, the ionic or potentially ionic group(s) being preferably chosen from the ternary or quaternary ammonium groups or the groups convertible into such groups, the carboxyl group, the carboxylate group, the sulfonic acid group, the sulfonate group, and mixtures thereof, more preferably chosen from the sulfonic acid group, the sulfonate group, and mixtures thereof, even more preferably the hydrophilic monomer B3) is chosen from the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid (AAS), the sodium salt of N-(2-aminoethyl)-2-aminopropionic acid, and mixtures thereof, most preferably the hydrophilic monomer B3) is the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid (ASA).

9. Use according to any one of the preceding claims, in which the polyurethane(s) are obtainable from at least one amine compound B4) which is not substituted by one or more ionic or potentially ionic groups, preferably from at least one compound of formula H2N-R4-NH2 (XI) in which R4 represents an alkylene or alkylene oxide radical which is not substituted by one or more ionic or potentially ionic groups, more preferably from at least one compound chosen from diamine alkylenes, such as hydrazine, ethylenediamine, propylenediamine-1,2, propylenediamine-1,3, 1,4-butylenediamine, 1,6-diamino hexane, piperazine;alkylene oxide diamines, such as 3-{2-[2-(3-aminopropoxy)ethoxy]-ethoxy}propylamine, 2-methyl-1,5-pentanediamine, hexanediamine, isophoronediamine, 4,4-methylenedi-(cyclohexylamine), ether-amines, such as dipropylamine propylene glycol, dipropylamine di-propylene glycol, dipropylamine tripropylene glycol, dipropylamine poly(propylene glycol), dipropylamine ethylene glycol, dipropylamine poly(ethylene glycol), dipropylamine 1,3-propane diol, dipropylamine 2-methyl-1,3-propane diol, dipropylamine 1,4-butane diol, dipropylamine 1,3-butane diol, dipropylamine 1,6-hexane diol and dipropylamine cyclohexane-1,4-dimethanol, and mixtures thereof, even more preferably from at least one compound chosen from ethylenediamine, isophorone diamine, and mixtures thereof.;

10. Use according to claim 1, in which the polyurethane(s) are chosen from polyurethanes with the following INCI names: polyurethane-32, polyurethane-34, polyurethane-35, polyurethane-48, polyurethane-93, and polyurethane-99, and mixtures thereof, preferably from polyurethanes with the following INCI names: polyurethane-34, polyurethane-35, polyurethane-48, and mixtures thereof, more preferably the polyurethane is the polyurethane with the following INCI name: polyurethane-48

11. HO. Use according to any one of the preceding claims in which the composition (C) comprises a total polyurethane content ranging from 0.05% to 5% by weight, preferably ranging from 0.1% to 3% by weight, more preferably ranging from 0.2% to 1.5% by weight, relative to the total weight of the composition (C).

12. Use according to any one of the preceding claims, wherein the composition (C) comprises a total water content ranging from 60% to 99.95% by weight, preferably ranging from 70% to 99.5% by weight, more preferably ranging from 80% to 99% by weight, relative to the total weight of the composition (C).

13. Use according to any one of the preceding claims, in which the composition (C) comprises a total silicone content of less than 0.1% by weight, preferably less than 0.01% by weight, more preferably less than 0.001% by weight relative to the total weight of the composition, even more preferably, the composition (C) is free of silicones.

14. A method of treating hair comprising applying to the hair the polyurethane(s) as defined in any one of claims 1 to 10 or a composition (C) as defined in any one of claims 1 to 13, close to the roots, preferably at least over an area of ​​between 0 and 10 cm measured relative to the surface of the scalp, more preferably at least over an area of ​​between 0 and 5 cm measured relative to the surface of the scalp.