COMPOSITION FOR KERATINOUS FIBERS

Abstract

COMPOSITION FOR KERATINOUS FIBERS The present invention relates to a composition for keratinous fibers, comprising: (a) at least one oxidizing agent; (b) phosphoric acid; and (c) at least one salt of phosphoric acid, excluding disodium phosphate, wherein the sum of the weight ratio between the amount of (b) phosphoric acid and the amount of (c) the salt(s) of phosphoric acid, excluding disodium phosphate, and the sum of the amount of (b) phosphoric acid and the amount of (c) the salt(s) of phosphoric acid, excluding disodium phosphate, ranges from 5.2 to 7.0, provided that the amount is based on a percentage (%) by weight relative to the total weight of the composition. The composition according to the present invention can color or dye keratinous fibers such as hair by limiting the lightening of the keratinous fibers. Figure for abstract: none

Description

Title of the invention: COMPOSITION FOR KERATINOUS FIBERS technical field

[0001] The present invention relates to a composition for keratinous fibers, in particular a coloring or dyeing composition for keratinous fibers such as hair. STATE OF THE ART

[0002] It is known to dye keratinous fibers, particularly hair, using dye compositions containing oxidative color precursors, generally called oxidative bases, such as ortho- or paraphenylenediamines, ortho- or para-aminophenols, and heterocyclic compounds. These oxidative bases are generally combined with couplers. These oxidative bases and couplers are colorless or weakly colored compounds. However, when combined with oxidizing agents, they can provide colored dye molecules through a process of oxidative condensation.

[0003] This type of oxidation coloring, that is, oxidative dyeing, makes it possible to obtain colors with very high visibility, gray coverage, and a wide variety of shades. Oxidative dyeing is widely used because of its strong color uptake compared to direct dyeing using so-called direct dyes.

[0004] To perform an oxidative dyeing process, typically, a composition comprising one or more oxidative bases and one or more couplers with one or more alkali agents is mixed with a developer composition comprising one or more oxidizing agents to prepare a ready-to-use composition. This ready-to-use composition is then applied to keratin fibers to dye the keratin fibers. DISCLOSURE OF THE INVENTION

[0005] In recent years, due to the trend towards bleaching, some consumers' hair has become naturally lighter, so there is a need for a hair cosmetic product that can dye their hair without further lightening it.

[0006] Thus, an objective of the present invention is to propose a composition for keratinous fibers, which can color or dye the keratinous fibers while limiting the lightening of the keratinous fibers.

[0007] The above objective can be achieved by a composition for keratinous fibers, comprising:

[0008] (a) at least one oxidizing agent;

[0009] (b) phosphoric acid; and

[0010] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0011] in which

[0012] the sum

[0013] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0014] and

[0015] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0016] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0017] The (a) oxidizing agent may be hydrogen peroxide.

[0018] The quantity of the (a) oxidizing agent(s) in the composition according to the present invention can be from 0.1% to 30% by weight, preferably from 0.3% to 25% by weight, and more preferably from 0.5% to 20% by weight, relative to the total weight of the composition.

[0019] The amount of (b) phosphoric acid in the composition according to the present invention may be from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight or less, and more preferably from 0.5% to 10% by weight or less, relative to the total weight of the composition.

[0020] The (c) salt of phosphoric acid may be monosodium phosphate.

[0021] The quantity of (c) phosphoric acid salt, with the exception of disodium phosphate, in the composition according to the present invention may be from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight or less, and more preferably from 0.5% to 10% by weight or less, relative to the total weight of the composition.

[0022] The composition according to the present invention may further comprise (d) water.

[0023] The quantity of (d) water in the composition according to the present invention can be from 30% to 80% by weight, and preferably from 40% to 70% by weight, relative to the total weight of the composition.

[0024] The composition according to the present invention may further comprise (e) at least one oil.

[0025] The quantity of the oil(s) in the composition according to the present invention can be from 0.1% to 40% by weight, preferably from 0.5% to 35% by weight, and more preferably from 1% to 30% by weight, relative to the total weight of the composition.

[0026] The composition according to the present invention may further comprise (f) at least one fatty alcohol.

[0027] The quantity of the fatty alcohol(s) in the composition according to the present invention can be from 0.1% to 20% by weight, preferably from 0.5% to 15% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition.

[0028] The composition according to the present invention may further comprise (g) at least one non-ionic surfactant.

[0029] The composition according to the present invention may be a cosmetic composition for keratinous fibers, preferably a cosmetic composition for coloring keratinous fibers, and more preferably a cosmetic composition for coloring hair.

[0030] The present invention may also relate to a method for treating, preferably coloring, keratinous fibers such as hair, comprising the steps of:

[0031] (1) mixing of a first composition and a second composition for prepare a mixture;

[0032] in which

[0033] the first composition comprises

[0034] (a) at least one oxidizing agent,

[0035] (b) of phosphoric acid, and

[0036] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0037] in which

[0038] the sum

[0039] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), with the exception of disodium phosphate,

[0040] and

[0041] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0042] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the first composition,

[0043] and

[0044] the second composition comprises (h) at least one alkaline agent, and optionally (i) at least one dye;

[0045] and

[0046] (2) the application of the mixture to the keratinous fibers. Best embodiment of the invention

[0047] After extensive research, the inventors discovered that it is possible to propose a composition for keratinous fibers, which can color or dye the keratinous fibers while limiting the lightening of the keratinous fibers.

[0048] Thus, the composition according to the present invention comprises:

[0049] (a) at least one oxidizing agent;

[0050] (b) phosphoric acid; and

[0051] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0052] in which

[0053] the sum

[0054] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), with the exception of disodium phosphate,

[0055] and

[0056] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0057] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0058] The composition according to the present invention can color or dye keratinous fibers such as hair while limiting the lightening of the keratinous fibers. In other words, the composition according to the present invention can color or dye keratinous fibers such as hair without significantly increasing the lightening of the keratinous fibers.

[0059] The composition according to the present invention can be used as a cosmetic composition for keratinous fibers such as hair, preferably a cosmetic composition for coloring or dyeing keratinous fibers, and more preferably a cosmetic composition for oxidative dyeing keratinous fibers.

[0060] The composition according to the present invention can provide a good appearance, such as a good shine, to keratin fibers such as hair. Thus, the composition according to the present invention can color or dye keratin fibers, while improving their appearance, such as their shine.

[0061] Furthermore, the composition according to the present invention can also provide keratinous fibers such as hair with an improved tactile sensation, such as enhanced softness and / or a smoother texture. Thus, the composition according to the present invention can color or dye keratinous fibers, while enhancing the softness and / or smooth texture of the keratinous fibers.

[0062] The present invention will be described in detail below.

[0063] [Composition]

[0064] (Oxidizing agent)

[0065] The composition according to the present invention comprises (a) at least one oxidizing agent. If two or more oxidizing agents are used, they may be identical or different.

[0066] The (a) oxidizing agent may be chosen from hydrogen peroxide, per- salts oxygenated compounds, and compounds capable of producing hydrogen peroxide by hydrolysis. For example, (a) the oxidizing agent may be selected from hydrogen peroxide, urea peroxide, alkali metal bromates and ferricyanides, and persalts such as perborates and persulfates. At least one oxidase enzyme selected, for example, from laccases, peroxidases, and 2-electron oxidoreductases such as uricase may also be used as (a) the oxidizing agent, if necessary in the presence of its respective donor or cofactor.

[0067] It is preferable that the (a) oxidizing agent be hydrogen peroxide.

[0068] In one embodiment, the composition according to the present invention may comprise at least one hydrogen peroxide stabilizer, which may be selected from, for example, alkali metal and alkaline earth metal pyrophosphates, alkali metal and alkaline earth metal stannates, phenacetin, and acid and oxyquinoline salts, for example, oxyquinoline sulfate. In another embodiment, at least one stannate optionally in combination with at least one pyrophosphate is used. Salicylic acid and its salts, pyridinedicarboxylic acid and its salts, and paracetamol may also be used.

[0069] In the composition according to the present invention, the concentration of the hydrogen peroxide stabilizer can range from 0.0001% to 5% by weight, such as from 0.01% to 2% by weight, relative to the total weight of the composition.

[0070] In the composition according to the present invention, the concentration ratio between hydrogen peroxide and the optional at least one stabilizer can range from 0.05:1 to 1000:1, such as from 0.1:1 to 500:1 and furthermore such as from 1:1 to 200:1.

[0071] The quantity of the (a) oxidizing agent(s) in the composition according to the present invention may be 0.1% by weight or more, preferably 0.3% by weight or more, and more preferably 0.5% by weight or more, relative to the total weight of the composition.

[0072] The quantity of the (a) oxidizing agent(s) in the composition according to the present invention may be 30% by weight or less, preferably 25% by weight or less, and more preferably 20% by weight or less, relative to the total weight of the composition.

[0073] The quantity of the (a) oxidizing agent(s) in the composition according to the present invention can be from 0.1% to 30% by weight, preferably from 0.3% to 25% by weight, and more preferably from 0.5% to 20% by weight, relative to the total weight of the composition.

[0074] (Phosphoric acid)

[0075] The composition according to the present invention comprises (b) phosphoric acid.

[0076] (b) Phosphoric acid is an inorganic acid and may be called orthophosphoric acid. (b) Phosphoric acid may be represented by H3PO4.

[0077] The amount of (b) phosphoric acid in the composition according to the present invention may be 0.1% by weight or more, preferably 0.3% by weight or more, and more preferably 0.5% by weight or more, relative to the total weight of the composition.

[0078] The amount of (b) phosphoric acid in the composition according to the present invention may be 20% by weight or less, preferably 15% by weight or less, and more preferably 10% by weight or less, relative to the total weight of the composition.

[0079] The quantity of (b) phosphoric acid in the composition according to the present invention can be from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight, and more preferably from 0.5% to 10% by weight, relative to the total weight of the composition.

[0080] (Phosphoric acid salt)

[0081] The composition according to the present invention comprises (c) at least one salt of phosphoric acid, excluding disodium phosphate (Na2HPO4). If two or more of these salts are used, they may be identical or different.

[0082] The (c) phosphoric acid salt, other than disodium phosphate, may be inorganic salts such as alkali metal salts, for example, sodium phosphate and potassium phosphate, or ammonium salts. Preferably, the (c) phosphoric acid salt, other than disodium phosphate, may be monosodium phosphate (NaH2PO4).

[0083] The (c) salt of phosphoric acid, with the exception of disodium phosphate, may be in the form of anhydrous or hydrates such as monohydrate and dihydrate.

[0084] The quantity of the (c) phosphoric acid salt(s), with the exception of disodium phosphate, in the composition according to the present invention may be 0.1% by weight or more, preferably 0.3% by weight or more, and more preferably 0.5% by weight or more, relative to the total weight of the composition.

[0085] The quantity of the (c) phosphoric acid salt(s), with the exception of disodium phosphate, in the composition according to the present invention may be 20% by weight or less, preferably 15% by weight or less, and more preferably 10% by weight or less, relative to the total weight of the composition.

[0086] The quantity of the (c) phosphoric acid salt(s), with the exception of disodium phosphate, in the composition according to the present invention can be from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight, and more preferably from 0.5% to 10% by weight, relative to the total weight of the composition.

[0087] (Conditions)

[0088] In the composition according to the present invention,

[0089] the sum

[0090] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), with the exception of disodium phosphate,

[0091] and

[0092] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0093] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0094] The quantity can be represented as a percentage by weight.

[0095] If the above conditions are met, the composition according to the present invention can color or dye keratinous fibers such as hair by limiting the lightening of the keratinous fibers.

[0096] In addition, if the above conditions are met, the composition according to the present invention can also provide good shine to keratinous fibers such as hair.

[0097] (Water)

[0098] Preferably, the composition according to the present invention may comprise (d) water.

[0099] The (d) water can constitute an aqueous phase which can be, for example, a continuous phase in the composition according to the present invention.

[0100] The quantity of (d) water in the composition according to the present invention may be 30% by weight or more, preferably 40% by weight or more, relative to the total weight of the composition.

[0101] The quantity of (d) water in the composition according to the present invention may be 80% by weight or less, preferably 70% by weight or less, relative to the total weight of the composition.

[0102] The quantity of (d) water in the composition according to the present invention can be from 30% to 80% by weight, preferably from 40% to 70% by weight, relative to the total weight of the composition.

[0103] (pH)

[0104] The composition according to the present invention may have a pH of 1.0 to less than 7.0, preferably from 1.1 to 5.0, and more preferably from 1.2 to 3.5, which is measured at 25 °C.

[0105] (Oil)

[0106] The composition according to the present invention may comprise (e) at least one oil. If two or more oils are used, they may be identical or different.

[0107] Here, "oil" means a fatty compound or a fatty substance that is in the form of a liquid or a paste (not solid) at room temperature (25 °C) under atmospheric pressure (760 mmHg). As the oil(s), that which generally These oils, used in cosmetics, can be used alone or in combination. They can be volatile or non-volatile.

[0108] The (e) oil may be a non-polar oil such as a hydrocarbon oil, a silicone oil or the like; a polar oil such as a vegetable or animal oil and an ester oil or an ether oil; or a mixture thereof.

[0109] The (e) oil may be chosen from the group consisting of oils of vegetable or animal origin, synthetic oils, silicone oils and hydrocarbon oils.

[0110] Examples of vegetable oils include, for example, linseed oil, camellia oil, macadamia nut oil, corn oil, mink oil, olive oil, avocado oil, sasanqua oil, castor oil, safflower oil, jojoba oil, sunflower oil, almond oil, rapeseed oil, sesame oil, soybean oil, peanut oil, and mixtures thereof.

[0111] Examples of synthetic oils include alkane oils such as isododecane and isohexadecane, ester oils, ether oils and artificial triglycerides.

[0112] The ester oils are preferably liquid esters of saturated or unsaturated, linear or branched, Ci-C26 aliphatic monoacids or polyacids and of saturated or unsaturated, linear or branched, Ci-C26 aliphatic monoalcohols or polyalcohols, the total number of carbon atoms of the esters being greater than or equal to 10.

[0113] Preferably, for monoalcohol esters, at least one of the alcohol and acid from which the esters of the present invention are derived is branched.

[0114] Among the monoesters of monoacids and monoalcohols, ethyl palmitate, ethylhexyl palmitate, isopropyl palmitate, dicaprylyl carbonate, alkyl myristates such as isopropyl myristate or ethyl myristate, isocetyl stearate, 2-ethylhexyl isononanoate, isononyl isononanoate, isodecyl neopentanoate and isostearyl neopentanoate may be mentioned.

[0115] Esters of C4-C22 dicarboxylic or tricarboxylic acids and CrC22 alcohols and esters of monocarboxylic, dicarboxylic or tricarboxylic acids and C4-C26 non-sugar dihydroxy, trihydroxy, tetrahydroxy or pentahydroxy alcohols may also be used.

[0116] Examples include: diethyl sebacate; isopropyl lauroyl sarcosinate; diisopropyl sebacate; bis(2-ethylhexyl) sebacate; diisopropyl adipate; di-n-propyl adipate; dioctyl adipate; bis(2-ethylhexyl) adipate; diisostearyl adipate; bis(2-ethylethylethylyl) maleate; triisopropyl citrate; triisocetyl citrate; triisostearyl citrate; glyceryl trilactate; glyceryl trioctanoate; trioctyldodecyl citrate; trioleyl citrate; neopentyl glycol diheptanoate; diethylene glycol dii-sononanoate.

[0117] As ester oils, esters and sugar diesters of C6-C30 fatty acids, and preferably C2-C22, may be used. It is recalled that the term "sugar" refers to oxygen-bearing hydrocarbon compounds containing several alcohol functional groups, with or without aldehyde or ketone functional groups, and comprising at least four carbon atoms. These sugars may be monosaccharides, oligosaccharides, or polysaccharides.

[0118] Examples of suitable sugars include sucrose, glucose, galactose, ribose, fucose, maltose, fructose, mannose, arabinose, xylose and lactose and their derivatives, in particular alkyl derivatives, such as methyl derivatives, for example methylglucose.

[0119] Sugar esters of fatty acids may be selected in particular from the group comprising the esters or mixtures of esters of sugars described above and of fatty acids in the range of C6-C30, and preferably in the range of C2-C22, linear or branched, saturated or unsaturated. If they are unsaturated, these compounds may have one to three conjugated or non-conjugated carbon-carbon double bonds.

[0120] The esters according to this variant can also be chosen from monoesters, diesters, triesters, tetraesters, polyesters and their mixtures.

[0121] These esters may be, for example, oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates and arachidonates, or mixtures thereof such as, in particular, mixed esters of oleopalmitate, oleostearate and palmitostearate, as well as pentaerythrityl tetraethyl hexanoate.

[0122] More particularly, monoesters and diesters are used, and in particular monooleates or dioleates, stearates, behenates, oleopalmitates, linoleates, linolenates and oleostearates of sucrose, glucose or methylglucose.

[0123] An example that can be cited is the product sold under the name Glucate® DO by the company Amerchol, which is a methylglucose dioleate.

[0124] By way of examples of preferred ester oils, the following may be cited, for example: diisopropyl adipate, dioctyl adipate, 2-ethylhexyl hexanoate, ethyl laurate, cetyl octanoate, octyldodecyl octanoate, isodecyl neopentanoate, myristyle propionate, 2-ethylhexyl 2-ethylhexanoate, 2-ethylhexyl octanoate, 2-ethylhexyl caprylate / caprate, methyl palmitate, ethyl palmitate, isopropyl palmitate, dicaprylyl carbonate, isopropyl lauroyl sarcosinate, isononyl isononanoate, ethylhexyl palmitate, isohexyl laurate, hexyl laurate, isocetyl stearate, Isopropyl isostearate, isopropyl myristate, isodecyl oleate, glyceryl tri(2-ethylhexanoate), pentaerythrityl tetra(2-ethylhexanoate), 2-ethylhexyl succinate, diethyl sebacate, and mixtures thereof.

[0125] Examples of artificial triglycerides include, for example, capryl caprylyl glycerides, glyceryl trimyristate, glyceryl tripalmitate, glyceryl trilinolenate, glyceryl trilaurate, glyceryl tricaprate, glyceryl tricaprylate, glyceryl tri(caprate / caprylate) and glyceryl tri(caprate / caprylate / linolenate).

[0126] Examples of silicone oils include linear organopolysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenopolysiloxane and the like; cyclic organopolysiloxanes such as cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, do-decamethylcyclohexasiloxane, and the like; and mixtures thereof.

[0127] Preferably, the silicone oil is selected from liquid polydialkylsiloxanes, in particular liquid polydimethylsiloxanes (PDMS) and liquid polyorganosiloxanes comprising at least one aryl group.

[0128] These silicone oils can also be organo-modified. The organo-modified silicones that can be used according to the present invention are silicone oils as defined above and comprise in their structure one or more organofunctional groups attached via a hydrocarbon-based group.

[0129] Organopolysiloxanes are defined in more detail in Chemistry and Technology of Silicones (1968) by Walter Noll, Academy Press. They can be volatile or non-volatile.

[0130] When volatile, silicones are particularly chosen from those having a boiling point between 60 °C and 260 °C, and even more particularly from:

[0131] (i) cyclic polydialkylsiloxanes comprising 3 to 7 and preferably 4 to 5 silicon atoms. Examples include octamethylcyclotetrasiloxane, sold in particular under the name Volatile Silicone® 7207 by Union Carbide or Silbione® 70045 V2 by Rhodia; decamethylcyclopentasiloxane, sold under the name Volatile Silicone® 7158 by Union Carbide and Silbione® 70045 V5 by Rhodia; and dodecam ethylcyclopentasiloxane, sold under the name Silsoft 1217 by Momentive Performance Materials, and mixtures thereof. Also noteworthy are cyclocopolymers of the dimethylsiloxane / methylalkylsiloxane type, such as Silicone Volatile® FZ 3109, marketed by Union Carbide, with the formula: p D" — U--D" -- D*--1 CH. --------------------------• GH. I " I ' with D": — Ss - O — and with d*: - Ss - O — CH. CgH,r

[0132] We can also mention mixtures of cyclic polydialkylsiloxanes with organosilicon compounds, such as the mixture of octamethylcyclotetrasiloxane and te- tramethylsilylpentaerythritol (50 / 50) and the mixture of octamethylcyclotetrasiloxane and oxy-l,r-bis(2,2,2',2',3,3'-hexatrimethylsilyloxy)neopentane;

[0133] (ii) linear volatile polydialkylsiloxanes containing 2 to 9 silicon atoms and having a viscosity less than or equal to 5 x 10⁶ m² / s at 25 °C. An example is deca-methyltetrasiloxane, sold in particular under the name SH 200 by Toray Silicone. Silicones belonging to this category are also described in the article published in Cosmetics and Toiletries, Vol. 91, Jan. 76, pp. 27–32, Todd & Byers, Volatile Silicone Fluids for Cosmetics. The viscosity of silicones is measured at 25 °C according to ASTM 445 Annex C.

[0134] Non-volatile polydialkylsiloxanes can also be used. These non-volatile silicones are more particularly chosen from among the polydialkylsiloxanes, among which the main examples are polydimethylsiloxanes containing trimethylsilyl terminal groups.

[0135] Among these polydialkylsiloxanes, the following commercial products may be cited, without limitation:

[0136] - Silbione® oils from ranges 47 and 70 047 or Mirasil® oils sold by Rhodia, for example oil 70 047 V 500 000;

[0137] - the oils from the Mirasil® range sold by the company Rhodia;

[0138] - Dow Corning's 200 series oils, such as DC200 with a viscosity of 60,000 mm2 / s;

[0139] - Viscasil® oils from General Electric and certain oils in the SF range (SF 96, SF 18) from General Electric.

[0140] We can also mention polydimethylsiloxanes containing dimethylsilanol terminal groups known as dimethiconol (CTFA), such as the oils in the 48 range from the Rhodia company.

[0141] Silicones containing aryl groups include polydiarylsiloxanes, in particular polydiphenylsiloxanes and polyalkylarylsiloxanes. Examples include products sold under the following names:

[0142] - Silbione® oils from the 70 641 range of Rhodia;

[0143] - the oils from the Rhodorsil® 70 633 and 763 ranges from Rhodia;

[0144] - Dow Corning 556 Cosmetic Grade Fluid oil from Dow Corning;

[0145] - silicones from Bayer's PK range, such as product PK20;

[0146] - certain oils in the General Electric SF range, such as SF 1023, SF 1154, SF 1250 and SF 1265.

[0147] Organomodified liquid silicones may, in particular, contain polyethyleneoxy and / or polypropyleneoxy groups. Examples include KF-6017 silicone offered by Shin-Etsu, and Silwet® L722 and L77 oils from Union Carbide.

[0148] Hydrocarbon oils may be selected from:

[0149] - lower C6-Ci6 alkanes, linear or branched, optionally cyclic. Examples that can be cited include hexane, undecane, dodecane, tridecane, and isoparaffins, for example isohexadecane, isododecane, and isodecane; and

[0150] - linear or branched hydrocarbons containing more than 16 carbon atoms, such as such as liquid paraffins, liquid petroleum jelly, hydrogenated polydecenes and polyisobutenes such as Parleam and squalane.

[0151] Preferred examples of hydrocarbon oils may be cited, for example, linear or branched hydrocarbons such as isohexadecane, isododecane, squalane, mineral oil (for example, liquid paraffin), paraffin, Vaseline or petrolatum, naphthalenes, and the like; hydrogenated polyisobutene, isoeicosane and decene / butene copolymer; and mixtures thereof.

[0152] It is preferable that the (e) oil be chosen from ester oils, hydrocarbon oils, and mixtures thereof.

[0153] The quantity of the oil(s) in the composition according to the present invention may be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

[0154] The quantity of the oil(s) in the composition according to the present invention may be 40% by weight or less, preferably 35% by weight or less, and more preferably 30% by weight or less, relative to the total weight of the composition.

[0155] The quantity of the oil(s) in the composition according to the present invention can be from 0.1% to 40% by weight, preferably from 0.5% to 35% by weight, and more preferably from 1% to 30% by weight, relative to the total weight of the composition.

[0156] (Fatty alcohol)

[0157] The composition according to the present invention may comprise (f) at least one fatty alcohol. If two or more fatty alcohols are used, they may be identical or different.

[0158] The term "fatty" here means the inclusion of a relatively large number of carbon atoms. Thus, alcohols with 6 or more, preferably 8 or more, and more preferably 10 or more carbon atoms, are included within the scope of fatty alcohols. Fatty alcohols may be saturated or unsaturated. A fatty alcohol may be linear or branched. Two or more fatty alcohols may be used in combination.

[0159] The (f) fatty alcohol may have the structure R-OH in which R is selected from saturated and unsaturated, linear and branched radicals containing from 8 to 40 carbon atoms, for example from 8 to 30 carbon atoms. In at least one embodiment, R is selected from the Ci2-C24 alkyl and Ci2-C24 alkenyl groups. R may be substituted or not by at least one hydroxyl group.

[0160] Non-limiting examples of (f) fatty alcohols that may be cited include lauric alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, linoleyl alcohol, undecylenyl alcohol, palmitoleyl alcohol, arachidonylic alcohol, erucyl alcohol, cetearyl alcohol and mixtures thereof.

[0161] Examples of suitable fatty alcohols include, but are not limited to, cetyl alcohol, cetearyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol and mixtures thereof.

[0162] Fatty alcohol can represent a mixture of fatty alcohols, meaning that several species of fatty alcohol can coexist in a commercial product in the form of a mixture.

[0163] According to at least one embodiment, the fatty alcohol used in the composition according to the present invention is chosen from a mixture of cetyl alcohol and cetearyl alcohol (cetearyl alcohol).

[0164] The quantity of the (f) fatty alcohol(s) in the composition according to the present invention may be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

[0165] The quantity of the (f) fatty alcohol(s) in the composition according to the present invention may be 20% by weight or less, preferably 15% by weight or less, and more preferably 10% by weight or less, relative to the total weight of the composition.

[0166] The quantity of the (f) fatty alcohol(s) in the composition according to the present invention can be from 0.1% to 20% by weight, preferably from 0.5% to 15% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition.

[0167] (Non-ionic surfactant)

[0168] The composition according to the present invention may comprise (g) at least one nonionic surfactant. If two or more nonionic surfactants are used, they may be identical or different.

[0169] Nonionic surfactants are well known (for example, see "Handbook of Surfactants" by M.R. Porter, Blackie & Son publishers (Glasgow and London), 1991, pp. 116-178), and may be selected from, for example, alcohols, alpha-diols, alkylphenols, and fatty acid esters, in which these compounds are ethoxylated, propoxylated, or glycerolated and have at least one fatty chain comprising, for example, 8 to 30 carbon atoms, knowing that the number of ethylene oxide or propylene oxide groups may range from 2 to 50, and the number of glycerol groups may range from 1 to 30. Maltose derivatives may also be mentioned. may also include, but is not limited to, ethylene oxide and / or propylene oxide copolymers; ethylene oxide and / or propylene oxide condensates with fatty alcohols; polyethoxylated fatty amides comprising, for example, 2 to 30 mol of ethylene oxide; polyglycerol fatty amides comprising, for example, 1.5 to 5 glycerol groups, such as 1.5 to 4; ethoxylated fatty acid esters of sorbitan comprising 2 to 30 mol of ethylene oxide; ethoxylated oils of vegetable origin; fatty acid esters of sucrose; fatty acid esters of polyethylene glycol; mono- or diesters of polyethoxylated fatty acids of (C6-C24)alkyl polyglycosides of glycerol; N-(C6-C24)alkylglucarnine derivatives, amine oxides such as (Cio-Ci4)alkylamine oxides or N-(Ci0-Ci4)acylaminopropylmorpholine oxides; silicone surfactants; and mixtures thereof.

[0170] The (g) nonionic surfactants may preferably be selected from monooxyalkylated, polyoxyalkylated, monoglycerol, or polyglycerol nonionic surfactants. The oxyalkylene motifs are more particularly oxyethylene or oxypropylene motifs, or a combination thereof, and are preferably oxyethylene motifs.

[0171] Examples of monooxyalkylated or polyoxyalkylated nonionic surfactants that may be cited include:

[0172] monooxyalkylated or polyoxyalkylated (C8-C24)alkylphenols,

[0173] monooxyalkylated or polyoxyalkylated C8-C30 alcohols, saturated or unsaturated, linear or branched,

[0174] monooxyalkylated or polyoxyalkylated C8-C30 amides, saturated or unsaturated, linear or branched,

[0175] esters of saturated or unsaturated, linear or branched C8-C30 acids, and of monoalkylene glycol or polyalkylene glycols,

[0176] monooxyalkylated or polyoxyalkylated esters of saturated or unsaturated, linear or branched C8-C30 acids, and of sorbitol,

[0177] vegetable oils, monooxyalkylated or polyoxyalkylated, saturated or unsaturated, and

[0178] ethylene oxide and / or propylene oxide condensates, among others, alone or in mixtures.

[0179] The (g) non-ionic surfactants preferably contain a number of moles of ethylene oxide and / or propylene oxide between 1 and 100, preferably between 1 and 50, and more preferably between 1 and 20.

[0180] According to one embodiment of the present invention, the non-ionic monooxyalkylated surfactants can be selected from a mono-oxyethylated fatty alcohol (ethylene glycol fatty alcohol ether), a monooxyethylated fatty ester (ethylene glycol fatty acid ester), and mixtures thereof.

[0181] Examples of monooxyalkylated fatty esters that may be cited include glycol distearate.

[0182] According to one embodiment of the present invention, the non-ionic polyoxyalkylated surfactants can be selected from a polyoxyethylated fatty alcohol (polyethylene glycol and fatty alcohol ether), a polyoxyethylated fatty ester (polyethylene glycol and fatty acid ester), and mixtures thereof.

[0183] Examples of polyoxyethylenated fatty alcohols (or C8-C30 alcohols) that may be cited include ethylene oxide adducts with lauryl alcohol, in particular those containing 2 to 20 oxyethylene units and more particularly those containing 2 to 10 oxyethylene units (CTFA names Laureth-2 to Laureth-20); ethylene oxide adducts with behenyl alcohol, in particular those containing 2 to 20 oxyethylene units (CTFA names Beheneth-2 to Beheneth-20); ethylene oxide adducts with cetearyl alcohol (a mixture of cetyl alcohol and stearyl alcohol), in particular those containing 2 to 20 oxyethylene units (CTFA names Ceteareth-2 to Ceteareth-20); ethylene oxide adducts with cetyl alcohol, in particular those containing 2 to 20 oxyethylene motifs (CTFA names Ceteth-2 to Ceteth-20); ethylene oxide adducts with stearyl alcohol, in particular those containing 2 to 20 oxyethylene motifs (CTFA names Steareth-2 to Steareth-20);Ethylene oxide adducts with isostearyl alcohol, in particular those containing 2 to 20 oxyethylene units (CTFA names Isosteareth-2 to Isosteareth-20) and mixtures thereof.

[0184] Examples of unsaturated polyoxyethylenated fatty alcohols (or C8-C30 alcohols) that may be cited include ethylene oxide adducts with oleyl alcohol, in particular those containing 2 to 20 oxyethylene motifs and more particularly those containing 2 to 10 oxyethylene motifs (CTFA names Oleth-2 to Oleth-20); and mixtures thereof.

[0185] It is preferable that the (g) non-ionic surfactant be chosen from monooxyalkylated, polyoxyalkylated non-ionic surfactants, more preferably polyoxyalkylated non-ionic surfactants, and even more preferably polyoxyethylated fatty alcohols.

[0186] The quantity of the (g) non-ionic surfactant(s) in the composition according to the present invention may be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

[0187] The quantity of the (g) non-ionic surfactant(s) in the composition according to the present invention may be 20% by weight or less, preferably 15% by weight or less, and more preferably 10% by weight or less, relative to the total weight of the composition.

[0188] The quantity of the (g) non-ionic surfactant(s) in the composition according to the the present invention can be from 0.1% to 20% by weight, preferably from 0.5% to 15% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition.

[0189] (Other optional ingredients)

[0190] The composition according to the present invention may also include at least one other optional or additional ingredient.

[0191] The other optional or additional ingredient(s) may be chosen from the group consisting of anionic, cationic and amphoteric surfactants; thickeners; anti-dandruff agents; antioxidants; antibacterial agents such as benzoic acid; preservatives such as phenoxyethanol; pearlescent and opacifying agents; plasticizers or coalescers; fillers; chelating agents; emulsifiers and perfumes.

[0192] As the other optional or additional ingredient(s), the composition according to the present invention may include one or more cosmetically acceptable organic solvents, which may be alcohols: in particular monovalent alcohols such as ethyl alcohol, isopropyl alcohol, benzyl alcohol and phenylethyl alcohol; diols such as ethylene glycol, propylene glycol and caprylyl glycol; other polyols such as glycerol; and ethers such as monomethyl, monoethyl and monobutyl ethers of ethylene glycol, monomethyl, monoethyl and monobutyl ethers of propylene glycol and monomethyl, monoethyl and monobutyl ethers of butylene glycol.

[0193] The quantity of the other optional or additional ingredient(s) is not limited, but may be from 0.01% to 30% by weight, preferably from 0.01% to 20% by weight, and more preferably from 0.01% to 10% by weight, relative to the total weight of the composition according to the present invention.

[0194] The composition according to the present invention may include at least one cationic polymer; however, it is preferable that the composition according to the present invention be free of any cationic polymer.

[0195] The cationic polymer can be chosen from those including at least one quaternary ammonium group such as polyquaternium polymers.

[0196] The expression "free from any cationic polymer" means that the composition according to the present invention does not include a substantial amount of cationic polymer. Preferably, the composition according to the present invention includes 1% by weight or less, more preferably 0.5% by weight or less, and even more preferably 0.1% by weight or less of a cationic polymer, in particular no cationic polymer.

[0197] According to a preferred embodiment, the composition according to the present invention comprises:

[0198] from 0.1% to 30% by weight, relative to the total weight of the composition, of (a) at least one oxidizing agent which is hydrogen peroxide;

[0199] from 0.1% to 20% by weight, relative to the total weight of the composition, of (b) phosphoric acid; and

[0200] from 0.1% to 20% by weight, relative to the total weight of the composition, of (c) at least one salt of phosphoric acid, with the exception of disodium phosphate, which is monosodium phosphate,

[0201] in which

[0202] the sum

[0203] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), with the exception of disodium phosphate, which is monosodium phosphate,

[0204] and

[0205] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate, which is monosodium phosphate,

[0206] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0207] According to a preferred embodiment, the composition according to the present invention comprises:

[0208] from 0.5% to 20% by weight, relative to the total weight of the composition, of (a) at least one oxidizing agent;

[0209] from 0.5% to 10% by weight, relative to the total weight of the composition, of (b) phosphoric acid; and

[0210] from 0.5% to 10% by weight, relative to the total weight of the composition, of (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0211] in which

[0212] the sum

[0213] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0214] and

[0215] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0216] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0217] (Preparation)

[0218] The composition according to the present invention can be prepared by mixing the essential and optional ingredients described above in a conventional manner.

[0219] For example, the composition according to the present invention can be prepared by a process comprising the step of

[0220] mixture

[0221] (a) at least one oxidizing agent;

[0222] (b) of phosphoric acid; and

[0223] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0224] so that

[0225] the sum

[0226] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0227] and

[0228] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0229] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition.

[0230] For ingredients (a) to (c) above, those explained above may be used.

[0231] It is possible to further mix any of the optional ingredients such as (d) water, (e) oil, (f) fatty alcohol, (g) non-ionic surfactants, and the other optional or additional ingredients above.

[0232] [Usage]

[0233] The composition according to the present invention is preferably used for cosmetic purposes on keratinous fibers. Thus, the composition according to the present invention is preferably a cosmetic composition for treating keratinous fibers, in particular for coloring or dyeing keratinous fibers.

[0234] Examples of keratinous fibers include hair, eyebrows, and eyelashes. Preferably, the keratinous fibers should be hair.

[0235] If the composition according to the present invention is used to color or dye keratinous fibers such as hair, the composition according to the present invention may be used in a mixture with another composition comprising (h) at least one alkaline agent, and optionally (i) at least one dye. In this case, the composition according to the present invention may act as a developer.

[0236] The above mixture can be considered a ready-to-use composition. For the purposes of the present invention, the expression "ready-to-use composition" is defined herein as a composition to be applied immediately to keratinous fibers such as hair. The ready-to-use composition can also be a cosmetic composition for treating keratinous fibers, in particular for coloring or dyeing keratinous fibers, such as hair.

[0237] The mixing ratio between the composition according to the present invention and another The composition is not limited. The mixing ratio can be from 1:3 to 3:1, preferably from 1:2 to 2:1, and more preferably from 1:1, as a weight ratio between these.

[0238] (Alkaline agent)

[0239] The composition to be mixed with the composition according to the present invention comprises (h) at least one alkali agent. If two or more alkali agents are used, they may be identical or different.

[0240] The (h) alkali agent may include at least one selected from alkanolamines, alkanolamine derivatives, and alkanolamine salts or alkanolamine derivatives.

[0241] Alkanolamines have an alkane structure with at least one hydroxyl group and at least one amino group.

[0242] Examples of alkanolamines include mono-, di- and triethanolamines. The alkanolamine may be selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, N,-dimethylethanolamine, 2-amino-2-methyl-1,3-propanediol, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, 3-amino-1,2-propanediol, 3-dimethylamino-1,2-propanediol, tris(hydroxymethylamino)methane, and mixtures thereof.

[0243] The alkanolamine derivative may be selected from alkanolamines in which the hydrogen atom on the nitrogen atom, if any, of the amino group in the alkanolamines is substituted by at least one substituent.

[0244] Examples of substituents include an alkyl group, an alkenyl group, and an alkynyl group.

[0245] The alkyl group may be linear, branched, or cyclic. The alkyl group may be linear or branched C1-C6 alkyl group, preferably a C1-C4 alkyl group, such as a methyl group, an ethyl group, a propyl group, an i-propyl group, or a butyl group. Alternatively, the alkyl group may be a cyclic C3-C6 alkyl group, such as a cyclopentyl group or a cyclohexyl group.

[0246] The alkenyl group may be a C2-C6 alkenyl group such as a vinyl group, an allyl group, a butylene group, a pentenyl group and a hexenyl group.

[0247] The alkynyl group may be a C2-C6 alkynyl group such as an ethynyl group and a propanyl group.

[0248] The above substituent may further be substituted by at least one group such as a halogen atom, a nitro group, a cyano group, a hydroxyl group and an aromatic group such as a phenyl group.

[0249] The (h) alkaline agent may also include an additional alkalinizing agent.

[0250] The additional alkalizing agent may be chosen from among the inor- alkalizing agents ganiques and / or organics.

[0251] Examples of inorganic alkalizing agents include sodium and potassium hydroxide.

[0252] Ammonia can be used as an inorganic alkalizing agent. However, it is preferable that the amount of ammonia in the composition according to the present invention be as low as possible. For example, the amount of ammonia in the composition according to the present invention may be 1% by weight or less, preferably 0.1% by weight or less, and more preferably 0.01% by weight or less. It is particularly preferable that the composition according to the present invention not include ammonia.

[0253] Examples of organic alkalizing agents include urea, guanidine and their derivatives; diamines such as those described in the structure below: R3 R2 R4

[0254] in which

[0255] R denotes an alkylene such as propylene optionally substituted by a hydroxyl or a Ci-C4alkyl radical, and R2, R3 and R4 independently denote a hydrogen atom, an alkyl radical or a Ci-C4hydroxyalkyl radical, an example of which may be 1,3-propanediamine and its derivatives.

[0256] The type of alkanolamine salts and alkanolamine derivatives is not limited. The salts may be acidic salts. Examples of acidic salts include, for instance, salts of inorganic acids such as hydrochlorides, sulfates, nitrates, and phosphates, and salts of organic acids such as citrates, oxalates, acetates, formates, maleates, and tartrates.

[0257] The quantity of the (h) alkali agent(s) in the composition to be mixed with the composition according to the present invention may be 0.1% by weight or more, preferably 0.2% by weight or more, and more preferably 0.3% by weight or more, relative to the total weight of the first composition.

[0258] The quantity of the (h) alkali agent(s) in the composition to be mixed with the composition according to the present invention may be 15% by weight or less, preferably 12% by weight or less, and more preferably 9% by weight or less, relative to the total weight of the first composition.

[0259] The quantity of the (h) alkali agent(s) in the composition to be mixed with the composition according to the present invention can be from 0.1% to 15% by weight, preferably from 0.2% to 12% by weight, and more preferably from 0.3% to 9% by weight, relative to the total weight of the first composition.

[0260] (Dye)

[0261] The composition to be mixed with the composition according to the present invention optionally comprises (i) at least one dye. If two or more dyes are used, they may be identical or different.

[0262] It is preferable that the dye be chosen from among the oxidative dyes.

[0263] Oxidative dyes can be chosen from oxidation bases and couplers.

[0264] The oxidation base may be chosen from those classically known in oxidation dyeing, preferably from the group consisting of ortho- and paraphenylenediamines, double bases, ortho- and para-aminophenols, heterocyclic bases, and their acid addition salts.

[0265] Examples include:

[0266] - (I) paraphenylenediamines of the following formula (I) and their addition salts with an acid: NR.FL J 1 >

[0267] in which:

[0268] Ri represents a hydrogen atom, a Ci-C4 alkyl radical, a mo-nohydroxy(Ci-C4 alkyl) radical, a polyhydroxy(C2-C4 alkyl) radical, a CrC4-alkyl CrC4 alkoxy radical, a CrC4 alkyl radical substituted with a nitrogen-containing group, a phenyl radical, or a 4'-aminophenyl radical;

[0269] R2 represents a hydrogen atom, a CrC4 alkyl radical, a mo-nohydroxy(CrC4 alkyl) radical, a polyhydroxy(C2-C4 alkyl) radical, a CrC4-alkyl CrC4 alkoxy radical, or a CrC4 alkyl radical substituted with a nitrogen-containing group;

[0270] Ri and R2 can also form with the nitrogen atom on which they are based a heterocycle containing nitrogen with 5 or 6 links optionally substituted by one or more alkyl, hydroxyl or ureido groups;

[0271] R3 represents a hydrogen atom, a halogen atom such as a chlorine atom, a Ci-C4 alkyl radical, a sulfo radical, a carboxyl radical, a mo-nohydroxy(Ci-C4 alkyl) radical, a hydroxy(Ci-C4 alkoxy) radical, an acetylamino(Ci-C4 alkoxy) radical, a mesylamino(Ci-C4 alkoxy) radical, or a carbamoylamino(Ci-C4 alkoxy) radical; and

[0272] Ri represents a hydrogen or halogen atom or an alkyl radical in CrC4.

[0273] Among the nitrogen-containing groups of formula (I) above, particular examples include amino radicals, C1-C4 mono-alkylamino, C1-C4 dialkylamino, CrC4 trial-kylamino, CrC4 monohydroxy-alkylamino, di(monohydroxy(alkyl in Ci-C4))amino, imidazolinium and ammonium.

[0274] Among the paraphenylenediamines of formula (I) above, particular examples include paraphenylenediamine, paratolylenediamine, 2-chloro-paraphenylenediamine, 2,3-dimethyl-paraphenylenediamine, 2,6-dimethyl-paraphenylenediamine, 2,6-diethyl-paraphenylenediamine, 2,5-dimethyl-paraphenylenediamine, N,N-dimethyl-paraphenylenediamine, N,N-diethyl-paraphenylenediamine, N,N-dipropyl-paraphenylenediamine, 4-amino-N,N-diethyl 1-3-methyl laniline, N,N-bis([3-hydroxyethyl)-paraphenylenediamine, 4-N,N-bis(P-hydroxyethyl)amino-2-methylaniline, 4-N,N-bis([3-hydroxyethyl)amino-2-chloroaniline, 2-[3-hydroxyethyl-paraphenylenediamine, 2-fluoro-paraphenylenediamine, 2-isopropyl-paraphenylenediamine, N-([3-hydroxypropyl)-paraphenylenediamine, 2-hydroxymethyl-paraphenylenediamine, N,N-dimethyl-3-methyl-paraphenylenediamine, N,N-(ethyl 1- [>- hydroxy ethy 1) -paraphenylenediamine, N-(|3,γ-dihydroxypropyl)-paraphenylenediamine, N-(4'-aminophenyl)-paraphenylenediamine,N-phenylparaphenylenediamine, 2-[3-hydroxyethyloxyparaphenylenediamine, 2-P-acetylaminoethyloxyparaphenylenediamine, N-(3-methoxyethyl)paraphenylenediamine, 2-methyl-N-[3-hydroxyethylparaphenylenediamine, N-(4-aminophenyl)-3-hydroxydroxypyrrolidine, 2-[2-[(4-aminophenyl)amino]ethyl}(2-hydroxyethyl)amino]ethanol, and their acid addition salts.

[0275] Among the paraphenylenediamines of formula (I) above, paraphenylenediamine, para-tolylenediamine, 2-isopropyl-paraphenylenediamine, 2-[3-hydroxyethyl-paraphenylenediamine, 2-[3-hydroxyethyloxy-paraphenylenediamine, 2,6-dimethyl-paraphenylenediamine, 2,6-diethyl-paraphenylenediamine, 2,3-dimethyl-paraphenylenediamine, N,N-bis([3-hydroxyethyl)-paraphenylenediamine, 2-chloro-paraphenylenediamine, and their addition salts with an acid are particularly preferred.

[0276] - (II) According to the present invention, "double bases" means compounds containing at least two aromatic rings on which amino and / or hydroxyl groups are attached.

[0277] Among the double bases that can be used as oxidation bases in the dyeing compositions according to the present invention, particular examples include the compounds corresponding to the following formula (II), and their addition salts with an acid:

[0278] in which:

[0279] - Zi and Z2, which are identical or different, represent a hydroxyl radical or -NH 2 which can be substituted by a Ci-C4 alkyl radical or by a Y bonding arm;

[0280] - the Y-linking arm represents a linear or branched alkylene chain comprising of 1 to 14 carbon atoms, which may be interrupted or terminated by one or more nitrogen-containing groups and / or one or more heteroatoms such as oxygen, sulfur or nitrogen atoms, and optionally substituted by one or more hydroxyl or alkoxy radicals in Ci-C6;

[0281] - R5 and R6 represent a hydrogen or halogen atom, an alkyl radical in Ci - C4, a monohydroxy radical (Ci-C4 alkyl), a polyhydroxy radical (C2-C4 alkyl), an amino radical (CrC4 alkyl), or a Y-linking arm;

[0282] - R7, R8, R9, Rio, Ri u and R12, which are identical or different, represent an atom of hydrogen, a Y-bonding arm, or an alkyl radical in CrC4; it being understood that compounds of formula (II) contain only one Y-bonding arm per molecule.

[0283] Among the nitrogen-containing groups of formula (II) above, particular examples include amino radicals, CrC4 mono-alkylamino, CrC4 dialkylamino, CrC4 trial-kylamino, CrC4 monohydroxy-alkylamino, imidazolinium and ammonium.

[0284] Among the double bases of formulas (II) above, we may mention more particularly N,N'-bis(P-hydroxyethyl)-N,N'-bis(4'-aminophenyl)-1,3-diaminopropanol, N,N'-bis(P-hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4-aminophenyl)-tetramethylenediamine, N,N'-bis(P-hydroxyethyl)-N,N'-bis(4-aminophenyl)tetramethylenediamine, N,N'-bis(4-methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'-methylphenyl)ethylenediamine, 1,8-bis(2,5-diaminophenoxy)-3,5-dioxaoctane, and their addition salts with an acid.

[0285] Among these double bases of formula (II), N,N'-bis(P-hydroxyethyl)-N,N'-bis(4'-aminophenyl)-1,3-diaminopropanol, the l,8-bis(2,5-diaminophenoxy)-3,5-dioxaoctane, or one of their addition salts with an acid are particularly preferred.

[0286] - (III) Para-aminophenols corresponding to the following formula (III), and their salts addition with an acid: OH HAS. [fw NH,

[0287] in which:

[0288] - Rn represents a hydrogen atom, or a halogen atom such as fluorine, a alkyl radical in Ci-C4, monohydroxy(alkyl in C1-C4), alkoxy in Ci-C4-alkyl in Ci-C4, amino(alkyl in Ci-C4) or hydroxy(alkylamino in Ci-C4)(alkyl in Ci-C4),

[0289] - R[4 represents a hydrogen atom, or a halogen atom such as fluorine, a alkyl radical in Ci-C4, monohydroxy(alkyl in Ci-C4), polydroxy(alkyl in C2-C4), amino(alkyl in Ci-C4), cyano(alkyl in Ci-C4) or alkoxy in Ci-C4-alkyl in Ci-C4.

[0290] Among the para-aminophenols of formula (III) above, para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2-hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-([3-hydroxyethylaminomethyl)phenol, and their addition salts with an acid.

[0291] - (IV) Ortho-aminophenols that can be used as oxidation bases in the context of the present invention are chosen in particular from 2-aminophenol, 2-amino-l-hydroxy-5-methylbenzene, 2-amino-l-hydroxy-6-methylbenzene, 5-acetamido-2-aminophenol, and their salts of addition with an acid.

[0292] - (V) Among the heterocyclic bases that can be used as bases oxidation in dye compositions according to the present invention, we can mention more particularly pyridine derivatives, pyrimidine derivatives, pyrazole derivatives, and their addition salts with an acid.

[0293] Among the pyridine derivatives, special mention may be made of the compounds described for example in patents GB 1 026 978 and GB 1 153 196, such as 2,5-diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine, 2,3-diamino-6-methoxypyridine, 2-([3-methoxyethyl)amino-3-amino-6-methoxypyridine, 3,4-diaminopyridine, and their addition salts with an acid.

[0294] Among the pyrimidine derivatives, the following compounds may be mentioned in particular: described, for example, in patents DE 2 359 399; JP 88-169571; and JP 91-10659, or patent application WO 96 / 15765, such as 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6-diaminopyrimidine, 2,5,6-triaminopyrimidine, and pyrazolopyrimidine derivatives such as those mentioned in patent application FR-A-2 750 048 and among which may be cited pyrazolo[l,5-a]-pyrimidine-3,7-diamine; 2,5-dimethyl-pyrazolo[l,5-a]-pyrimidine-3,7-diamine; pyrazolo [1,5-a]pyrimidine-3,5-diamine; 2,7-dimethylpyrazolo[l,5-a]pyrimidine-3,5-diamine; 3-aminopyrazolo[1,5-a]pyrimidine-7-ol; 3-amino-pyrazolo[1,5-a]pyrimidine-5-ol; 2-(3-aminopyrazolo-[l,5-a]pyrimidin-7-ylamino)ethanol, 2-(7-aminopyrazolo[l,5-a]pyrimidin-3-ylamino)ethanol, 2-[(3-aminopyrazolo[l,5-a]pyrimidin-7-yl)-(2-hydroxyethyl)amino]ethanol, 2-[(7-aminopyrazolo[l,5-a]-pyrimidin-3-yl)-(2-hydroxyethyl)amino]ethanol, 5,6-dimethylpyrazolo-[l,5-a]pyrimidine-3,7-diamine, 2,6-dimethylpyrazolo-[l,5-a]pyrimidine-3,7-diamine, 2,5,N7,N7-tetramethylpyrazolo[l,5-a]pyrimidine-3,7-diamine, 3-amino-5-methyl-7-imidazolylpropyl-aminopyrazolo[l,5-a]-pyrimidine, their addition salts and their tautomeric forms, when a tautomeric equilibrium exists, and their addition salts with an acid.

[0295] Among the pyrazole derivatives, particular mention may be made of the compounds described in patents DE 3 843 892 and DE 4 133 957 and patent applications WO 94 / 08969, WO 94 / 08970, FR-A-2 733 749, and DE 195 43 988 such as 4,5-diamino-1-methylpyrazole, 3,4-diaminopyrazole, 4,5-diamino-1-(4'-chlorobenzyl)-pyrazole, 4,5-diamino-1,3-dimethylpyrazole, 4,5-diamino-3-methyl-1-phenylpyrazole, 4,5-diamino-1-methyl-3-phenylpyrazole, 4-amino-1,3-dimethyl-5-hydrazinopyrazole, l-benzyl-4,5-diamino-3-methylpyrazole, 4,5-diamino-3-tert-butyl-1-methylpyrazole, 4,5-diamino-l-tert-butyl-3-methylpyrazole, 4,5-diamino-l-([3-hydroxyethyl)-3-methylpyrazole, 4,5-diamino-l-([3-hydroxyethyl)pyrazole, 4,5-diamino-l-ethyl-3-methylpyrazole, 4,5-diamino-l-ethyl-3-(4'-methoxyphenyl)pyrazole, 4,5-diamino-l-ethyl-3-hydroxymethylpyrazole, 4,5-diamino-3-hydroxymethyl-1-methylpyrazole, 4,5-diamino-3-hydroxymethyl-l-isopropylpyrazole, 4,5-diamino-3-methyl-l-isopropylpyrazole,4-amino-5-(2'-aminoethyl)amino-l,3-dimethylpyrazole, 3,4,5-triaminopyrazole, l-methyl-3,4,5-triaminopyrazole, 3,5-diamino-l-methyl-4-methylaminopyrazole, , 3,5-diamino-4-([3-hydroxy-ethyl)amino-l-methylpyrazole, and their addition salts with an acid.

[0296] Among the heterocyclic bases that can be used as oxidation bases, diaminopyrazolopyrazolones, and in particular 2,3-diamino-6,7-dihydro-1H5H-[pyrazolol,2,a]pyrazol-1-one and the addition salts of these diaminopyrazolopyrazolones with an acid, can be mentioned in particular.

[0297] The coupler may be an oxidation coupler which may be chosen from those classically known in oxidation dyeing, preferably from the group consisting of meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthols, heterocyclic couplers and their addition salts with an acid.

[0298] Heterocyclic couplers may be selected from the group consisting of indole derivatives, indoline derivatives, sesamol and its derivatives, pyridine derivatives, pyrazolotriazole derivatives, pyrazolones, indazoles, benzimidazoles, benzothiazoles, benzoxazoles, 1,3-benzodioxoles, quinolines, and their addition salts with an acid.

[0299] These couplers are more particularly chosen from 2,4-diamino-l-([3-hydroxyethyloxy)benzene, 2-methyl-5-aminophenol, 5-N-([3-hydroxyethyl)amino-2-methylphenol, 3-aminophenol, 2-chloro-3-amino-6-methylphenol, 1,3-dihydroxybenzene, 1,3-dihydroxy-2-methylbenzene, 4-chloro-1,3-dihydroxybenzene, 2-amino-4-([3-hydroxyethylamino)-l-methoxybenzene, 1,3-diaminobenzene, 2-methyl-5-hydroxyethylaminophenol, 4-amino-2-hydroxytoluene, 1,3-bis(2,4-diaminophenoxy)-propane, sesamol, l-amino-2-methoxy-4,5-methylenedioxybenzene, α-naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 6-hydroxy-indoline, 2,6-dihydroxy-4-methylpyridine, 1H-3-methylpyrazol-5-one, 1-phenyl-3-methylpyrazol-5-one, 2-amino-3-hydroxypyridine, 3,6-dimethyl-pyrazolo[3,2-c]-1,2,4-triazole, 2,6-dimethylpyrazolo[1,5-b]-1,2,4-triazole, and their addition salts with an acid.

[0300] In general, the acid addition salts of the oxidation bases and of the couplers are chosen in particular from hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.

[0301] The quantity of the (i) dye(s) in the composition to be mixed with the composition according to the present invention may be 0.005% by weight or more, and preferably 0.01% by weight or more, relative to the total weight of the composition.

[0302] Furthermore, the quantity of the (i) dye(s) in the composition to be mixed with the composition according to the present invention may be 20% by weight or less, of preferably 15% by weight or less, and more preferably 12% by weight or less, relative to the total weight of the composition

[0303] The quantity of the (i) dye(s) in the composition to be mixed with the composition according to the present invention can be from 0.005% to 20% by weight, preferably from 0.005% to 15% by weight, and more preferably from 0.01% to 12% by weight, relative to the total weight of the composition.

[0304] [Required]

[0305] The present invention also relates to a kit for keratin fibers, preferably a cosmetic kit, and more preferably a cosmetic kit for coloring or dyeing keratin fibers, in particular hair, comprising:

[0306] a first compartment comprising a first composition comprising

[0307] (a) at least one oxidizing agent;

[0308] (b) of phosphoric acid; and

[0309] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0310] in which

[0311] the sum

[0312] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0313] and

[0314] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0315] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the first composition,

[0316] and

[0317] a second compartment comprising a second composition comprising

[0318] (h) at least one alkali agent, and

[0319] (i) optionally at least one dye.

[0320] The first composition may further include any of the ingredients (d) to (g) explained above.

[0321] For ingredients (a) to (i) above, those explained above may be used.

[0322] It is possible to use the necessary by dispensing or discharging, for example, the first composition from the first compartment, while dispensing or discharging the second composition from the second compartment, and then treating the keratinous fibers such as hair with the mixture of the first and second compositions.

[0323] The mixture of the first and second compositions can be considered as the ready-to-use composition as explained above.

[0324] The mixing ratio between the first and second compositions is not limited. The mixing ratio may be from 1:3 to 3:1, preferably from 1:2 to 2:1, and more preferably from 1:1, as a weight ratio between them.

[0325] [Procedure]

[0326] The present invention also relates to a method, preferably a cosmetic method, and more preferably a cosmetic method for coloring or dyeing keratinous fibers, in particular hair, comprising the steps of:

[0327] (1) mixing of a first composition and a second composition for prepare a mixture;

[0328] in which

[0329] the first composition includes

[0330] (a) at least one oxidizing agent,

[0331] (b) of phosphoric acid, and

[0332] (c) at least one salt of phosphoric acid, with the exception of disodium phosphate,

[0333] in which

[0334] the sum

[0335] of the weight ratio between the quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate,

[0336] and

[0337] of the total quantity of (b) phosphoric acid and the quantity of (c) phosphoric acid salt(s), excluding disodium phosphate

[0338] ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the first composition,

[0339] and

[0340] the second composition comprises (h) at least one alkali agent, and optionally (i) at least one dye,

[0341] and

[0342] (2) the application of the mixture to the keratinous fibers.

[0343] The first composition may further include any of the ingredients (d) to (g) explained above.

[0344] For ingredients (a) to (i) above, those explained above may be used.

[0345] The mixture of the first and second compositions can be considered as the ready-to-use composition as explained above.

[0346] The mixing ratio between the first and second compositions is not limited. The mixing ratio may be from 1:3 to 3:1, preferably from 1:2 to 2:1, and more preferably from 1:1, as a weight ratio between them.

[0347] It is preferable that the process according to the present invention further comprise a washing step, with or without drying, of the keratinous fibers before and / or after the step application of the mixture of the first and second compositions, as a ready-to-use composition, on keratinous fibers.

[0348] The step of applying the ready-to-use composition to the keratinous fibers can be carried out by a conventional applicator such as a brush, or even by hand.

[0349] The keratin fibers to which the ready-to-use composition has been applied may be left for an appropriate time as required to treat the keratin fibers. The duration of the treatment is not limited, but it may be from 1 minute to 1 hour, preferably from 1 minute to 50 minutes. For example, the dyeing time of the keratin fibers may be from 1 to 50 minutes, preferably from 5 to 35 minutes. EXAMPLES

[0350] The present invention will be described in more detail by means of examples. However, these examples shall not be construed as limiting the scope of the present invention. The examples below are presented as non-limiting illustrations within the field of the present invention.

[0351] [Examples 1 to 7 and Comparative Examples 1 to 6]

[0352] (Preparation)

[0353] The following compositions according to Examples 1 to 7 and Comparative Examples 1 to 6, shown in Tables 1 and 2, were prepared by mixing the ingredients shown in Tables 1 and 2. The numerical values ​​of the quantities of ingredients shown in Tables 1 and 2 are all based on "% by weight" of active raw materials.

[0354] [Tables 1] Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Tetrasodium etidronate 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Tetrasodium pyrophosphate 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Sodium salicylate 0.035 0.035 0.035 0.035 0.035 0.035 0.035 Ethylhexyl palmitate 20 20 20 20 20 20 - Mineral oil - - - - - - 20 Cetearyl alcohol 6 6 6 6 6 6 6 POE (polyoxyethylene) stearyl ether 4.2 4.2 4.2 4.2 4.2 4.2 4.2 Tocopherol 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Hydrogenated peroxide 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Phosphoric acid 2.975 2.55 1.275 2.38 2.38 2.38 1.275 Sodium phosphate 1 1.5 5 2.56 2 1 5 Disodium phosphate - - - - - - - Water qs 100 qs 100 qs 100 qs 100 qs 100 qs 100 qs 100 pH 1.4 1.6 2.3 1.7 1.7 1.4 2.3 pH (mixture) 7.5 7.8 8.7 7.5 8 8.8 8.7 Phosphoric acid / Sodium phosphate 2.975 1.7 0.255 0.93 1.19 2.38 0.255 Phosphoric acid + sodium phosphate 3.975 4.05 6.275 4.94 4.38 3.38 6.275 (Phosphoric acid / Sodium phosphate) + (Phosphoric acid + sodium phosphate) 6.95 5.75 6.53 5,87 5.57 5.76 6.53 Lightening 0 0.2 0.2 0 0.2 0.2 0 Shine +++ +++ +++ +++ +++ ++ +++ ,

[0355] [Tables2] Ex. Comp. 1 Ex. Comp. 2 Ex. Comp. 3 Ex. Comp. 4 Ex. Comp. 5 Ex. Comp. 6 Tetrasodium etidronate 0.2 0.2 0.2 0.2 0.2 0.2 Tetrasodium pyrophosphate 0.04 0.04 0.04 0.04 0.04 0.04 Sodium salicylate 0.035 0.035 0.035 0.035 0.035 0.035 Ethylhexyl palmitate 20 20 20 20 20 20 Cetearyl alcohol 6 6 6 6 6 6 POE (polyoxyethylene) stearyl ether 4.2 4.2 4.2 4.2 4.2 4.2 Tocopherol 0.1 0.1 0.1 0.1 0.1 0.1 Hydrogen peroxide 1.5 1.5 1.5 1.5 1.5 1.5 Phosphoric acid 1.7 1.275 3.4 3.4 2.38 2.38 Sodium phosphate 0.6 0.5 1.3 1 - - Disodium phosphate - - - - - 2.56 Water qs 100 qs 100 qs 100 qs 100 qs 100 qs 100 pH 1.7 1.6 1.4 1.4 1.1 1.8 pH (mixture) 9.6 9.7 6.8 6.8 9.2 9.2 Phosphoric acid / Sodium phosphate 2.833 2.55 2.615 3.4 ND ND Phosphoric acid + sodium phosphate 2.3 1.775 4.7 4.4 2.38 2.38 (Phosphoric acid / Sodium phosphate) + (Phosphoric acid + sodium phosphate) 5.133 4.325 7.315 7.8 ND ND Brightening 1 1 0.8 0.6 1 1 Gloss + + + + + +

[0356] [Evaluations]

[0357] pH:

[0358] The pH of each of the compositions according to Examples 1 to 7 and Examples Com Comparatives 1 to 6 were measured. The results are shown in Tables 1 and 2.

[0359] pH (mixture):

[0360] Each of the compositions according to Examples 1 to 7 and Comparative Examples 1 to 6 was mixed with a dye composition (L'Oréal iNOA Japan lightener). The mixing weight ratio of each of the compositions according to Examples 1 to 7 and Comparative Examples 1 to 6 and the dye composition was 1:1. The pH of the resulting mixture was measured. The results are shown in Tables 1 and 2.

[0361] Cosmetic performance:

[0362] Each of the compositions, among those according to Examples 1 to 7 and Comparative Examples 1 to 6, was mixed with a dye composition (L'Oréal iNOA Japan lightener). The mixing weight ratio of each of the compositions according to Examples 1 to 7 and Comparative Examples 1 to 6 and the dye composition was 1:1.

[0363] 8 g each of the above mixture thus obtained were applied to 2.7 g (27 cm) from a strand of natural Chinese hair. The strand of hair was left for 35 minutes at 27 °C. The strand of hair was then washed with water, then shampooed, rinsed and dried.

[0364] Next, the lightening of the hair strand was visually assessed by 5 panelists by rating the hair strand according to the following criteria.

[0365] Slight enhancement of the brightening: +1

[0366] Virtually no enhancement of the brightening: 0

[0367] The average scores were calculated. The results are shown in Tables 1 and 2.

[0368] Next, the shine of the hair strand was visually assessed by 5 panelists by rating the hair strand according to the following criteria.

[0369] Excellent: +++

[0370] Good: ++

[0371] Correct: +

[0372] Bad: -

[0373] The average scores were calculated. The results are shown in Tables 1 and 2.

[0374] ND: Not Available

[0375] (Summary)

[0376] Compositions according to Examples 1 to 7 that include (a) at least one oxidizing agent; (b) phosphoric acid and (c) at least one salt of phosphoric acid, excluding disodium phosphate, provided that the sum of the weight ratio between the amount of (a) phosphoric acid and the amount of (c) salt(s) of phosphoric acid phosphoric, with the exception of disodium phosphate, and the total quantity of (a) phosphoric acid and the quantity of (c) phosphoric acid salt(s), with the exception of disodium phosphate, ranges from 5.2 to 7.0, provided that the quantity is based on the percentage (%) by weight relative to the total weight of the composition, were able to dye keratinous fibers while limiting the increase in keratinous fiber lightening.

[0377] Moreover, the compositions according to Examples 1 to 7 were able to provide good shine to the keratinous fibers.

[0378] The compositions according to Comparative Examples 1 to 6 do not satisfy the above condition. The compositions according to Comparative Examples 1 to 6 also considerably increase the lightening of colored or dyed keratin fibers, and do not provide good gloss to the keratin fibers.

Claims

Demands

1. Composition for keratinous fibers, comprising: (a) at least one oxidizing agent; (b) phosphoric acid; and (c) at least one salt of phosphoric acid, excluding disodium phosphate, wherein the sum of the weight ratio between the amount of (b) phosphoric acid and the amount of (c) salt(s) of phosphoric acid, excluding disodium phosphate, and the total of the amount of (b) phosphoric acid and the amount of (c) salt(s) of phosphoric acid, excluding disodium phosphate, ranges from 5.2 to 7.0, provided that the amount is based on the percentage (%) by weight relative to the total weight of the composition.

2. Composition according to claim 1, wherein the (a) oxidizing agent is hydrogen peroxide.

3. Composition according to any one of claims 1 to 2, wherein the amount of (b) phosphoric acid in the composition is from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight or less, and more preferably from 0.5% to 10% by weight or less, relative to the total weight of the composition.

4. Composition according to any one of claims 1 to 3, wherein (c) phosphoric acid salt is monosodium phosphate.

5. Composition according to any one of claims 1 to 4, wherein the amount of (c) phosphoric acid salt, with the exception of disodium phosphate, in the composition is from 0.1% to 20% by weight, preferably from 0.3% to 15% by weight or less, and more preferably from 0.5% to 10% by weight or less, relative to the total weight of the composition.

6. Composition according to any one of claims 1 to 5, further comprising (d) water, preferably in an amount of between 30% and 80% by weight, preferably between 40% and 70% by weight relative to the total weight of the composition.

7. Composition according to any one of claims 1 to 6, in which the composition further comprises (e) at least one oil.

8. Composition according to any one of claims 1 to 7, wherein the composition further comprises (f) at least one fatty alcohol.

9. Composition according to any one of claims 1 to 8, wherein the composition further comprises (g) at least one non-ionic surfactant.

10. A process for treating, preferably coloring, keratinous fibers, such as hair, comprising the steps of: (1) mixing a first composition and a second composition to obtain a mixture;wherein the first composition comprises (a) at least one oxidizing agent, (b) phosphoric acid, and (c) at least one salt of phosphoric acid, excluding disodium phosphate, wherein the sum of the weight ratio between the amount of (b) phosphoric acid and the amount of (c) salt(s) of phosphoric acid, excluding disodium phosphate, and the total of the amount of (b) phosphoric acid and the amount of (c) salt(s) of phosphoric acid, excluding disodium phosphate, ranges from 5.2 to 7.0, provided that the amount is based on the percentage (%) by weight relative to the total weight of the first composition, and the second composition comprises (h) at least one alkali agent, and optionally (i) at least one dye; and (2) the application of the mixture to the keratinous fibers.