HAIR TREATMENT METHOD BASED ON SILICATE AND PHOSPHORIC COMPOUND

Abstract

The present invention relates to a hair treatment method, employing a composition comprising at least one silicate compound and another composition comprising at least one specific phosphoric compound. The present invention also relates to the use of a composition comprising at least one silicate compound and another composition comprising at least one specific phosphoric compound, for repairing and / or preventing hair breakage.

Description

Title of the invention: HAIR TREATMENT METHOD BASED ON SILICATE AND PHOSPHORIC COMPOUND

[0001] The present invention relates to a hair treatment method employing a composition comprising at least one silicate compound and another composition comprising at least one particular phosphoric compound.

[0002] The present invention also relates to the use of a composition comprising at least one silicate compound and another composition comprising at least one particular phosphoric compound, to repair and / or prevent hair breakage.

[0003] External atmospheric agents such as pollution and inclement weather, as well as mechanical or chemical treatments, or certain routines such as brushing, combing, dyeing, bleaching, perming, straightening and / or repeated washing, can damage and weaken hair. Hair can then become damaged and, over time, become dry, rough, brittle, dull, split and / or limp.

[0004] Thus, to remedy these drawbacks, it is common to use hair care processes designed to condition the hair by providing it with satisfactory cosmetic properties, including smoothness, shine, softness to the touch, suppleness and lightness, as well as good detangling properties resulting in easier combing and better hair management, making it easier to style and helping it maintain its shape. However, the conditioning effect obtained by these hair care processes diminishes rapidly over time and does not strengthen the hair cortex. Such treatments do not provide a very long-lasting effect.

[0005] For example, shampoos are usually used to clean hair while providing satisfactory cosmetic properties, but these compositions do not improve the quality of the hair fiber. In particular, they do not improve the density of bonds between the proteins present in the fiber cortex, in order to repair it or reduce breakage, for example during combing or detangling.

[0006] There is therefore still a real need to develop a hair treatment process, preferably for damaged and / or sensitized hair, that is capable of preserving or even improving the quality of said hair, in particular by increasing the density of bonds between the proteins present in the cortex of this hair, thus allowing to repair them and / or reduce breakage and / or strengthen them in preparation for a treatment that may degrade them, for example during bleaching, combing or detangling.

[0007] Furthermore, the formulation of environmentally friendly cosmetic products, that is to say whose design and development take into account environmental issues, is becoming a major concern in order to help meet global challenges.

[0008] It is therefore essential to propose more sustainable compositions and / or preparation processes and / or ingredients, thus enabling us to meet these environmental challenges.

[0009] In this context, it is important to develop processes for preparing cosmetic products and / or cosmetic ingredients with a better carbon footprint capable of reducing the generation of carbon dioxide throughout the product life and / or low cost in energy and water and / or using greener solvents and / or with fewer synthesis steps and / or with good atom economy.

[0010] It has now been discovered that applying to hair a composition comprising at least one silicate compound and another composition comprising at least one particular phosphoric compound makes it possible to achieve the objectives set out above, and in particular to repair and / or prevent breakage of said hair, by improving in particular the density of bonds between the proteins present in the cortex of said hair.

[0011] The present invention, which relates in particular to a hair treatment method, preferably cosmetic, comprising at least the following steps: (i) a step of applying to said hair a composition (A) comprising at least one silicate compound, (ii) an application step on said hair of a composition (B), distinct from composition (A), comprising at least one phosphoric compound of the following formula (I), and / or at least one of its salts: R-[OP(O)(OH)2]n (I) where R represents an alkyl or alkylene radical, linear or branched, cyclic or non-cyclic, comprising from 1 to 12 carbon atoms, and n represents an integer between 1 and 10, and (iii) optionally an application step on said hair of a composition (C), distinct from compositions (A) and (B), comprising at least one alkali metal salt and / or at least one alkaline earth metal salt.

[0012] It has been observed that the treatment process according to the invention makes it possible to repair and / or prevent hair breakage, preferably of damaged and / or sensitized hair. Indeed, the process of the invention increases the density of bonds between the proteins present in the cortex of said hair. These are then more resistant to external stresses, particularly with regard to coloring, bleaching, combing and / or detangling.

[0013] These properties are also retained after several shampoos. Hair treated with the process of the invention is repaired and / or protected in a lasting manner against external agents and / or against treatments likely to damage said hair.

[0014] The invention also relates to the use of composition (A) and composition (B), and possibly composition (C), to repair and / or prevent hair breakage.

[0015] Other objects, features, aspects and advantages of the invention will become even clearer upon reading the description and example that follows.

[0016] In this description, and unless otherwise indicated: - the expression "at least one" is equivalent to the expression "one or more" and can be substituted for it. - the expression "between... and..." is equivalent to the expression "ranging from... to..." and can be substituted for it, and implies that the limits are included. - By the expression "greater than" and respectively the expression "less than" in the meaning of the present invention, we mean an open interval that is strictly greater than, respectively strictly less than, and therefore that the bounds are not included. - For the purposes of this application, "keratin fibers" refers particularly to human keratin fibers such as hair, eyelashes, eyebrows, and body hair, preferably hair, eyebrows and eyelashes, and even more preferably hair. - For the purposes of this invention, "hair" means the hair on the head. This term does not include body hair, eyebrows, or eyelashes.

[0017] Composition (A): The process according to the invention comprises the step of applying (i) to the hair a composition (A), preferably cosmetic, comprising at least one silicate compound.

[0018] For the purposes of the present invention, "silicate compound" means a salt of silicic acid.

[0019] Preferably, the composition (A) comprises at least one water-soluble silicate.

[0020] By "water-soluble silicate", for the purposes of the present invention, we mean a silicate which has a solubility in water at ordinary room temperature (25°C) and atmospheric pressure (1.013 x 1005 Pa) greater than 0.5% by weight (in grams of water-soluble silicate per 100 mL of water), preferably greater than 1% by weight (in grams of water-soluble silicate per 100 mL of water).

[0021] More preferably, the silicate(s) are chosen from alkali metal silicates, alkaline earth metal silicates, and mixtures thereof.

[0022] More preferably still, the silicate(s) are chosen from sodium silicates, potassium silicates, magnesium silicates, calcium silicates, and mixtures thereof.

[0023] Better still, the silicate(s) are chosen from sodium silicates, potassium silicates, and mixtures thereof.

[0024] Even better, composition (A) includes at least one sodium silicate.

[0025] And in a particularly preferred manner, composition (A) comprises at least sodium metasilicate.

[0026] Preferably, the total content of silicate compound(s) in composition (A) is in the range of 0.01% to 20% by weight, more preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, better 0.5% to 10% by weight, even better 0.75% to 5% by weight, always better 1% to 5% by weight, relative to the total weight of composition (A). Preferably, the total sodium silicate(s) content in composition (A) is in the range of 0.01% to 20% by weight, more preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, better 0.5% to 10% by weight, even better 0.75% to 5% by weight, always better 1% to 5% by weight, relative to the total weight of composition (A). Preferably, the total sodium metasilicate content in composition (A) is in the range of 0.01% to 20% by weight, more preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, better 0.5% to 10% by weight, even better 0.75% to 5% by weight, always better 1% to 5% by weight, relative to the total weight of composition (A).

[0027] More preferably, the total water content in the composition (A) is in the range of 80% to 99.99% by weight, more preferably 85% to 99.95% by weight, more preferably still 85% to 99.90% by weight, better 90% to 99.50% by weight, better still 95% to 99.25% by weight, better still 95% to 99% by weight, relative to the total weight of the composition (A).

[0028] The pH of the composition (A) according to the invention varies preferably from 7 to 14, more preferably from 7.5 to 13.5, more preferably from 8 to 13.2, better from 9 to 13, and even better from 10 to 12.

[0029] The pH of the composition (A) can be adjusted to the desired value by means of commonly used alkalizing or acidifying agents. Examples of alkalizing agents include ammonia, alkanolamines, and mineral or organic hydroxides. Examples of acidifying agents include mineral or organic acids such as hydrochloric acid, orthophosphoric acid, sulfuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid, lactic acid, sulfonic acids.

[0030] Preferably, composition (A) does not contain a phosphoric compound of formula (I) as described below and / or one of its salts.

[0031] Composition (B): The process according to the invention comprises the step of applying (ii) to the hair a composition (B) comprising at least one phosphoric compound of the following formula (I), and / or at least one of its salts: R-[OP(O)(OH)2]n (I) where R represents an alkyl or alkylene radical, linear or branched, cyclic or non-cyclic, comprising from 1 to 12 carbon atoms, and n represents an integer between 1 and 10.

[0032] For the purposes of this invention, alkyl radical means a saturated, linear or branched, cyclic or non-cyclic hydrocarbon group comprising from 1 to 12 carbon atoms, preferably from 1 to 10 carbon atoms, more preferably from 4 to 8 carbon atoms, more preferably from 5 to 7 carbon atoms, such as 6 carbon atoms.

[0033] For the purposes of this invention, alkylene radical means a divalent hydrocarbon group, linear or branched, cyclic or non-cyclic, comprising from 1 to 12 carbon atoms, preferably from 1 to 10 carbon atoms, more preferably from 4 to 8 carbon atoms, more preferably from 5 to 7 carbon atoms.

[0034] Preferably, n is an integer between 4 and 8, preferably between 5 and 7. More preferably, n is equal to 6.

[0035] Preferably, R represents an alkyl radical, linear or branched, cyclic or non-cyclic, comprising: - from 1 to 12 carbon atoms, more preferably from 1 to 10 carbon atoms, even more preferably from 4 to 8 carbon atoms, better still from 5 to 7 carbon atoms; and - n represents an integer between 1 and 10, more preferably between 4 and 8, more preferably between 5 and 7, better n is equal to 6.

[0036] More preferably, R represents a linear or branched, cyclic alkyl radical comprising: - from 1 to 12 carbon atoms, more preferably from 1 to 10 carbon atoms, more preferably from 4 to 8 carbon atoms, better still from 5 to 7 carbon atoms, such as 6 carbon atoms; and - n represents an integer between 1 and 10, more preferably between 4 and 8, more preferably between 5 and 7, better n is equal to 6.

[0037] More preferably, R represents a cyclic alkyl radical, comprising: - from 1 to 12 carbon atoms, more preferably from 1 to 10 carbon atoms, more preferably from 4 to 8 carbon atoms, better still from 5 to 7 carbon atoms; and - n represents an integer between 1 and 10, more preferably between 4 and 8, more preferably between 5 and 7, better n is equal to 6.

[0038] Even better, R represents a cycloalkyl radical, comprising: - from 4 to 8 carbon atoms, better yet from 5 to 7 carbon atoms such as 6 carbon atoms; and - n represents an integer between 1 and 10, more preferably between 4 and 8, more preferably between 5 and 7, better n is equal to 6.

[0039] Advantageously, R represents a cyclohexyl radical.

[0040] In a particularly preferred manner, the phosphoric compound of formula (I) is phytic acid. As an example of commercially available phytic acid, one can cite the compound sold by Tsuno Rice Fine Chemicals under the name "Phytic acid and water".

[0041] Advantageously, the salts of the phosphoric compounds of formula (I) are chosen from alkali metal salts; preferably from sodium salts and potassium salts. More preferably, the salts of the phosphoric compounds of formula (I) are sodium salts.

[0042] For the purposes of the present invention, phosphoric compounds of formula (I) and its salts are different from silicate compounds according to the invention.

[0043] Preferably, the total content of phosphoric compound(s) of formula (I) and / or their salts in composition (B) is in the range of 0.01% to 20% by weight, more preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, better 0.5% to 10% by weight, even better 0.75% to 5% by weight, always better 1% to 5% by weight, relative to the total weight of composition (B). Preferably, the total content of phytic acid and / or its salts in composition (B) is in the range of 0.01% to 20% by weight, more preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, better 0.5% to 10% by weight, even better 0.75% to 5% by weight, always better 1% to 5% by weight, relative to the total weight of composition (B).

[0044] Preferably, the composition (B) is aqueous.

[0045] More preferably, the total water content in the composition (B) is in the range of 80% to 99.99% by weight, more preferably from 85% to 99.95% by weight, more preferably from 85% to 99.90% by weight, better from 90% to 99.50% by weight, even better from 95% to 99.25% by weight, always better from 95% to 99% by weight, relative to the total weight of the composition (B).

[0046] The pH of the composition (B) according to the invention varies preferably from 1.5 to 7, more preferably from 1.5 to 6, more preferably from 1.5 to 5, better from 1.5 to 4.

[0047] The pH of composition (B) can be adjusted to the desired value by means of alkalizing agents or acidifying agents such as those described previously for composition (A).

[0048] Preferably, composition (B) does not contain a silicate compound as described above.

[0049] Composition (C): Preferably, the process according to the invention may further include an application step (iii) on the hair of a composition (C) comprising at least one alkali metal salt and / or at least one alkaline earth metal salt.

[0050] Composition (C) is distinct from compositions (A) and (B) as previously described. For the purposes of the present invention, the alkali and / or alkaline-earth metal salt(s) present in composition (C) are different from the silicate compound(s) present in composition (A) and, when present in composition (B), from the phosphoric compound(s) salt(s) of formula (I). Advantageously, composition (C) does not contain any silicate compound and does not contain any phosphoric compound of formula (I) or any of its salts.

[0051] Preferably, the alkali and / or alkaline-earth metal salt(s) of composition (C) are chosen from calcium salts, magnesium salts, sodium salts, potassium salts, and mixtures thereof.

[0052] More preferably, the alkali and / or alkaline-earth metal salt(s) of composition (C) are calcium salts.

[0053] More preferably still, the alkali and / or alkaline-earth metal salt(s) of composition (C) are chosen from calcium hydroxide, calcium oxides, calcium halides, calcium nitrate, calcium hydrogen carbonate, and mixtures thereof.

[0054] In a particularly preferred manner, the alkali and / or alkaline-earth metal salt(s) of composition (C) are chosen from calcium halides, such as calcium chloride.

[0055] According to a particular embodiment of the invention, composition (C) comprises: * at least one calcium salt, and * at least one alkali metal salt and / or at least one additional alkaline earth metal salt, other than calcium salts.

[0056] Preferably, the total content of alkali and / or alkaline earth metal salt(s) in composition (C) is in the range of 0.1% to 40% by weight, more preferably 0.5% to 30% by weight, more preferably 1% to 25% by weight, better 2% to 20% by weight, even better 5% to 15% by weight, relative to the total weight of composition (C). Preferably, the total calcium halide content in composition (C) is in the range of 0.1% to 40% by weight, more preferably 0.5% to 30% by weight, more preferably 1% to 25% by weight, better 2% to 20% by weight, better still 5% to 15% by weight, such as 10% by weight, relative to the total weight of composition (C). Preferably, the total calcium chloride content in composition (C) is in the range of 0.1% to 40% by weight, more preferably 0.5% to 30% by weight, more preferably still 1% to 25% by weight, better 2% to 20% by weight, better still 5% to 15% by weight, such as 10% by weight, relative to the total weight of composition (C).

[0057] More preferably, the total water content in the composition (C) is in the range of 60% to 99.9% by weight, more preferably 70% to 99.5% by weight, more preferably still 75% to 99% by weight, better 80% to 98% by weight, even better 85% to 95% by weight, relative to the total weight of the composition (C).

[0058] The pH of the composition (C) according to the invention varies preferably from 7 to 12, more preferably from 7.5 to 11.5, more preferably from 8 to 11.

[0059] The pH of composition (C) can be adjusted to the desired value by means of alkalizing agents or acidifying agents such as those described previously for composition (A).

[0060] Composition A and / or composition B and / or composition C according to the invention may also contain any adjuvant or additive commonly used in cosmetic compositions intended for hair treatment.

[0061] Among the additives that may be contained in the composition, we can mention softeners, anti-foaming agents, moisturizing agents, mineral fillers, UV filters, peptizers, perfumes, anionic, cationic, non-ionic or amphoteric surfactants, proteins, vitamins, anionic, cationic, non-ionic or amphoteric polymers, preservatives, rheological agents, silicones, and mixtures thereof.

[0062] Compositions A, B and C may be in particular in the form of a suspension, dispersion, gel, emulsion, in particular an oil-in-water emulsion (H / E) or water-in-oil (W / O), or multiple (W / O / O or polyol / O / O or W / O / O), in the form of a cream, foam, milk, vesicle dispersion, in particular of ionic or non-ionic lipids, bi-phase or multi-phase lotion.

[0063] The treatment process The treatment process, preferably cosmetic, according to the invention is a hair treatment process.

[0064] Preferably the treatment process according to the present invention is a process for repairing and / or preventing hair breakage.

[0065] According to the invention, steps (i), (ii) and (iii) are distinct and are implemented sequentially.

[0066] Preferably, step (i) of applying composition (A) to the hair is carried out before step (ii) of applying composition (B) to the hair.

[0067] Preferably, when step (iii) is implemented in the process of the invention, step (iii) of applying composition (C) to the hair is implemented before steps (i) and (ii) of application.

[0068] More preferably, step (iii) of applying composition (C) to the hair is carried out first, then step (i) of applying composition (A), and finally step (ii) of applying composition (B).

[0069] The treatment process according to the invention can be applied to dry or wet hair, preferably to wet hair.

[0070] The bath ratio of the composition (A), (B) and / or (C) applied to the hair can advantageously range from 0.1 to 10, preferably from 0.5 to 5, more preferably from 0.8 to 2. By bath ratio, we mean the ratio between the total weight of the composition applied and the total weight of hair to be treated.

[0071] The treatment process according to the invention may optionally include at least one additional step selected from the following steps iv) to vi): iv) a step of applying the composition (A), (B) and / or (C) to the hair, advantageously to wet hair, preferably for a duration of at least 10 seconds, said application step possibly being carried out under an airtight film such as a foil wrap or plastic film; (v) a step of rinsing and / or washing the hair; vi) a step of drying the hair in ambient air or using a heating device.

[0072] The exposure step can last from 10 seconds to 60 minutes, preferably from 30 seconds to 50 minutes, more preferably from 5 minutes to 45 minutes.

[0073] The washing step can, for example, be carried out using shampoo.

[0074] The temperature of the heating device can range from 45°C to 230°C, preferably from 45°C to 100°C, more preferably from 50°C to 80°C. A hair dryer, a heated helmet, an iron, or a heated brush can be used as a heating device, for example.

[0075] Step vi) of drying can also be a combination of air drying or drying with a heating device at a temperature ranging from 50°C to 80°C such as a hair dryer or a heated helmet, followed by a step of passing through the iron, preferably a straightening iron.

[0076] Steps iv), v) and / or vi) may be carried out before or after each step i), ii) and / or iii) according to the invention.

[0077] Steps i) to iii) or steps i) to vi) may be spaced from one step to the next from a few minutes to a few days or weeks; preferably less than one hour passes between each step of the process according to the invention.

[0078] According to a preferred embodiment, the process of the invention comprises the sequential application of composition (A) followed by a setting time followed by the application of composition (B) followed by a setting time, the application of composition (A) being optionally preceded by the application of a composition (C) left to set.

[0079] Preferably, the process according to the invention comprises a single washing step carried out at the end of steps i) and ii) and possibly iii).

[0080] Preferably, the hair or hairs treated by the process of the invention are damaged and / or sensitized hairs.

[0081] For the purposes of this invention, "damaged hair" means dry, rough, brittle, split and / or limp hair.

[0082] For the purposes of this invention, “sensitized hair” means bleached, artificially colored, straightened and / or permed hair.

[0083] The present invention also relates to the use of composition (A) and composition (B), and possibly composition (C), as described above, to repair and / or prevent hair breakage.

[0084] The following examples serve to illustrate the invention without, however, being limiting in nature. Examples

[0085] a. Preparation of compositions: Compositions A, B and C according to the invention were prepared from the ingredients mentioned in the table below, the quantities of which are expressed as % by weight of active substance (ma):

[0086] [Tables 1] Composition ABC Sodium metasilicate 2 - - Phytic acid - 2 - Calcium chloride - - 10 Water qsp 100 qsp 100 qsp 100

[0087] b. Preparation of hair strands: Strands of HT4 Caucasian hair, 1g and 20cm long, are sensitized by a treatment consisting of applying a mixture of L'Oréal Professionnel BlondStudio® 6 persulfate-based bleaching powder with a 40-volume hydrogen peroxide oxidizing agent at a mass ratio of 4:6, in a bath ratio of 10g of BlondStudio® 6 / H2O2 mixture per gram of hair, at 33°C. After 50 minutes of application of the bleaching mixture, the hair strands are squeezed dry between the fingers and then washed with shampoo.

[0088] c. Application protocols: * Two-step PI process: Composition A is applied to a previously bleached, damp strand of hair (see paragraph b. above), in a bath ratio of 1g of composition A per gram of hair and at 33°C. After 30 minutes of application, the strand is squeezed between the fingers, then composition B is applied to the same strand of hair while still damp, in a bath ratio of 1g of composition B per gram of hair and at 33°C. After 30 minutes of application, the strand is squeezed between the fingers, then washed with shampoo and finally dried with a hairdryer.

[0089] * Process P2 in three steps: Composition C is first applied to a previously bleached, damp strand of hair (see paragraph b. above), in a bath ratio of 1g of composition C per gram of hair and at 33°C. After 30 minutes of application, the strand is squeezed between the fingers, then composition A is applied to the same strand of hair while still damp, in a bath ratio of 1g of composition A per gram of hair and at 33°C. After 30 minutes of application, the strand is squeezed between the fingers, then composition B is applied to the same strand of hair while still damp, in a bath ratio of 1g of composition B per gram of hair and at 33°C. After 30 minutes of application, the strand is squeezed between the fingers, then washed with shampoo and finally dried with a hairdryer.

[0090] A strand of 1g and 20cm long natural and unsensitized Caucasian HT4 hair and a strand of 1g and 20cm long sensitized Caucasian HT4 hair according to preparation b. above without further treatment (i.e. not treated by PI or P2 protocols), were used as references.

[0091] d. Study of hair fiber repair by differential scanning calorimetry. Differential scanning calorimetry is known to those skilled in the art as a method for quantifying protein strengthening in the cortex of keratin fibers (Kinetics of the changes imparted to the main structural components of human hair by thermal treatment, https: / / doi.org / 10.1016 / j.tca.2018.01.014 & F.-J. Wortmann and H. Deutz, J. Appl. Polym Sci., 48, 137 (1993)). The principle of the test is to measure the protein denaturation temperature. It is widely recognized that the higher the protein denaturation temperature, the better the integrity of the cortex proteins, which reflects a reduction in fiber breakage.

[0092] The denaturation temperature is directly related to the binding density of keratin proteins present in the cortex. Thus, the lower the denaturation temperature, the lower the binding density of the proteins to each other, the more disulfide bonds break, and the cortex is damaged. A difference of 2°C is recognized by those skilled in the art as a significant change.

[0093] The apparatus used to perform the measurements is a METTLER DSC3+ reference apparatus (Temperature range: 30°C - 250°C; heating ramp of 10°C / min). This apparatus measures the energy flow during the heating of the sample. The temperature at which the energy flow is highest represents the denaturation temperature.

[0094] The results of the measurements of the denaturation temperature of each of the wicks are summarized in the table below. [Tables 2] Denaturation Temperature Protocols (°C) Unsensitized Caucasian HT4 hair strand (reference) 154.3 Sensitized Caucasian HT4 hair strand, without other treatment (reference) 141.9 Hair strand treated according to process PI 151.2 Hair strand treated according to process P2 159.1

[0095] The above results show that the PI and P2 processes according to the invention increase the binding density of keratin proteins present in the cortex of treated hair, thus making it possible to repair sensitized hair.

[0096] Indeed, the denaturation temperature of the strands treated according to the PI and P2 processes of the invention is close to, or even better than, that measured for unsensitized hair, thus demonstrating that the hair is repaired.

Claims

Demands

1. A hair treatment process comprising at least the following steps: i. a step of applying to the hair a composition (A) comprising at least one silicate compound, and ii. a step of applying to the hair a composition (B), distinct from composition (A), comprising at least one phosphoric compound of the following formula (I), and / or at least one of its salts: R-[OP(O)(OH)2]n (I) where R represents an alkyl or alkylene radical, linear or branched, cyclic or non-cyclic, comprising from 1 to 12 carbon atoms, and n represents an integer between 1 and 10.

2. A process according to the preceding claim, characterized in that the silicate(s) in composition (A) are selected from alkali metal silicates, alkaline earth metal silicates, and mixtures thereof; preferably from sodium silicates, potassium silicates, magnesium silicates, calcium silicates, and mixtures thereof; more preferably from sodium silicates, potassium silicates, and mixtures thereof; more preferably still from sodium silicates.

3. A process according to any one of the preceding claims, characterized in that composition (A) comprises at least sodium metasilicate.

4. A process according to any one of the preceding claims, characterized in that the total content of silicate compound(s) in composition (A) is in the range of 0.01% to 20% by weight, preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, more preferably 0.5% to 10% by weight, better 0.75% to 5% by weight, and even better 1% to 5% by weight, relative to the total weight of composition (A).

5. A method according to any one of the preceding claims, characterized in that, in the formula (I) of the phosphoric compounds, R represents an alkyl radical, linear or branched, cyclic or non-cyclic, comprising: - from 1 to 12 carbon atoms, more preferably from 1 to 10 carbon atoms, more preferably still from 4 to 8 carbon atoms, better still from 5 to 7 carbon atoms, such as 6 carbon atoms; and - n represents an integer between 1 and 10, more preferably between 4 and 8, more preferably still between 5 and 7, better still n is equal to 6.

6. A method according to any one of the preceding claims, characterized in that, in the formula (I) of the phosphoric compounds, R represents a cyclic alkyl radical, comprising: - from 1 to 12 carbon atoms, more preferably from 1 to 10 carbon atoms, more preferably from 4 to 8 carbon atoms, better from 5 to 7 carbon atoms, such as 6 carbon atoms; and - n represents an integer from 1 to 10, more preferably from 4 to 8, more preferably from 5 to 7, better n is equal to 6; preferably, R represents a cyclohexyl radical.

7. A process according to any one of the preceding claims, characterized in that composition (B) comprises at least phytic acid.

8. A process according to any one of the preceding claims, characterized in that the total content of phosphoric compound(s) of formula (I) and / or their salts in composition (B) is in the range of 0.01% to 20% by weight, preferably 0.05% to 15% by weight, more preferably 0.1% to 15% by weight, more preferably 0.5% to 10% by weight, better 0.75% to 5% by weight, and even better 1% to 5% by weight, relative to the total weight of composition (B).

9. A method according to any one of the preceding claims, characterized in that step (i) is carried out before step (ii).

10. A method according to any one of the preceding claims, characterized in that it further comprises a step (iii) of applying to the hair a composition (C), distinct from compositions (A) and (B), comprising at least one alkali metal salt and / or at least one alkaline earth metal salt.

11. A process according to claim 10, characterized in that the alkali metal and / or alkaline earth salt(s) of composition (C) are chosen from calcium salts, magnesium salts, sodium salts, potassium salts, and mixtures thereof; preferably from calcium salts; more preferably from calcium hydroxide, calcium oxides, calcium halides, calcium nitrate, calcium hydrogen carbonate, and mixtures thereof; more preferably still from calcium halides, such as calcium chloride.

12. A process according to any one of claims 10 or 11, characterized in that the total content of alkali and / or alkaline earth metal salt(s) in composition (C) is in the range of 0.1% to 40% by weight, preferably 0.5% to 30% by weight, more preferably 1% to 25% by weight, more preferably 2% to 20% by weight, and even better 5% to 15% by weight, relative to the total weight of composition (C).

13. A method according to any one of claims 10 to 12, characterized in that step (iii) of applying composition (C) to the hair is carried out before steps (i) and (ii) of application.

14. A method according to any one of the preceding claims, characterized in that the composition (B) is aqueous; preferably the total water content in the composition (B) is in the range of 80% to 99.99% by weight, more preferably 85% to 99.95% by weight, more preferably 85% to 99.90% by weight, better 90% to 99.50% by weight, better still 95% to 99.25% by weight, better still 95% to 99% by weight, relative to the total weight of the composition (B).

15. A method according to any one of the preceding claims, for repairing and / or preventing hair breakage; preferably for repairing and / or preventing breakage of damaged and / or sensitized hair.