Bleach compositions with improved mixability

Abstract

A bleaching composition A for keratin fibers, preferably human keratin fibers, more preferably for human hair, comprising a) one or more magnesium carbonate minerals according to general structure Mgx(CO3)y-(OH)2-zH2O, wherein x represents an integer in the range of 1 to 6, preferably x is an integer in the range of 1 to 5, y is an integer in the range of 1 to 4, and z is an integer in the range of 0 to 6, preferably the z in an integer in the range of 1 to 5, more preferably z is an integer in the range of 3 to 4, b) one or more clay mineral(s), c) one or more oxidizing agent(s), preferably one or more persalt(s) and / or peroxy salt(s),wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1.25, and wherein the total concentration of water is less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, still more preferably less than 0.5% by weight, calculated to the total weight of the composition, more preferably composition A is anhydrous.

Description

[0001] BLEACH COMPOSITIONS WITH IMPROVED MIXABILITY

[0002] Field of the invention

[0003] The present invention relates to a bleaching composition for human hair, a bleaching kit-of-parts, a ready-to-use bleaching composition, and bleaching process.

[0004] Background of the invention

[0005] Many people desire hair colors that are different from their natural hair color. Higher shades, especially blondes, are sought after. In order to achieve a high lift, bleaching products are needed, which are widely used. Applying the bleach products to a few streaks is also a common technique. For streaks, only a portion of the hair is lifted. Typically, a strand of hair is separated from the client's head and placed on a surface such as a board or the stylist's gloved hand. The bleaching product is then applied. In order to prevent the bleach from spreading to the surrounding area, the treated strand is covered and surrounded by a foil, such as plastic or aluminum. However, this process takes time due to the covering of the streaks. A popular service is called freehand bleaching or clay bleaching. This uses a bleach mixture that has a higher viscosity, is dry on the surface, and has a low swelling behavior. In this service, again, a strip is separated from the head. The bleach mixture is applied, but due to the above- mentioned characteristics, no foil or cover is needed. Surrounding hair may touch the streak, but due to the high viscosity of the bleach, its dry surface and low swelling, the bleach will not spread to the untreated hair over time.

[0006] However, a common problem with bleaching compositions that do not distribute into the untreated hair is the force required during the mixing process, which negatively affects the mixing speed. The prior art has not adequately addressed these problems. Therefore, there is a need for bleaching compositions with faster mixing times and requiring less mixing force despite their high viscosity.

[0007] Summary of the invention

[0008] The first object of the present invention is a bleaching composition A for keratin fibers, preferably human keratin fibers, more preferably for human hair, comprising: a) one or more magnesium carbonate minerals according to general structure Mgx(CO3)y-(OH)2-zH2O, wherein x represents an integer in the range of 1 to 6, preferably x is an integer in the range of 1 to 5, y is an integer in the range of 1 to 4, and z is an integer in the range of 0 to 6, preferably the z in an integer in the range of 1 to 5, more preferably z is an integer in the range of 3 to 4, b) one or more clay mineral(s), c) one or more oxidizing agent(s), preferably one or more persalt(s) and / or peroxy salt(s), wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25, and wherein the total concentration of water is less than 10% by weight, preferably less than 5% by weight, more preferably less than 1 % by weight, still more preferably less than 0.5% by weight, calculated to the total weight of composition A, more preferably composition A is anhydrous.

[0009] The second object is a two-part bleaching and / or lightening composition for keratin fibers, preferably human hair, wherein the first composition A is a composition as defined above and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6.

[0010] The third object of the present invention is a kit for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising the compositions A and B and at least one further composition selected from: a) an aqueous composition comprising one or more conditioning ingredients b) an aqueous composition comprising one or more oxidative dye(s) and / or direct dye(s), c) an aqueous composition comprising one or more cleansing surfactant(s).

[0011] The fourth object of the present invention is a ready-to-use bleaching and / or lightening composition for keratin fibers, preferably human hair, having a pH in the range of 9 to 11 comprising compound(s) a), b), and c) as defined above, and hydrogen peroxide, wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25. The fifth object of the present invention is a process for bleaching keratin fibers, preferably human keratin fibers, more preferably for human hair comprising the steps: i) optionally washing the hair with a cleansing composition and drying the hair, then ii) mixing the bleaching and / or lightening composition A as defined above with the aqueous composition B as defined above to prepare the ready-to-use composition as defined above; then iii) applying the ready-to-use composition onto hair for period of 1 to 45 min, preferably 10 to 45 min, more preferably 25 to 45 min; then iv) rinsing off the hair with water or optionally washing with a cleansing composition; then v) optionally drying the hair.

[0012] Detailed description of the invention

[0013] Inventors surprisingly found, that by the invention according to the independent claims has a shorter mixing time during the preparation of the ready-to-use mixture. Additionally, the hair bleached with the composition, kit, and process according to the independent claims was less damaged, showed superior shine and improved touch.

[0014] The present invention is directed to a bleaching composition A for keratin fibers, preferably human keratin fibers, more preferably for human hair, comprising: a) one or more magnesium carbonate minerals according to general structure Mgx(CO3)y-(OH)2-zH2O, wherein x represents an integer in the range of 1 to 6, preferably x is an integer in the range of 1 to 5, y is an integer in the range of 1 to 4, and z is an integer in the range of 0 to 6, preferably the z in an integer in the range of 1 to 5, more preferably z is an integer in the range of 3 to 4, b) one or more clay mineral(s), c) one or more oxidizing agent(s), preferably one or more persalt(s) and / or peroxy salt(s), wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25, and wherein the total concentration of water is less than 10% by weight, preferably less than 5% by weight, more preferably less than 1 % by weight, still more preferably less than 0.5% by weight, calculated to the total weight of composition A, more preferably composition A is anhydrous.

[0015] Compound(s) according to group a)

[0016] The composition A of the present invention comprises one or more magnesium carbonate minerals according to group a) according to the general structure Mgx(CO3)y-(OH)2-zH2O, wherein x represents an integer in the range of 1 to 6, preferably x is an integer in the range of 1 to 5, y is an integer in the range of 1 to 4, and z is an integer in the range of 0 to 6, preferably the z in an integer in the range of 1 to 5, more preferably z is an integer in the range of 3 to 4.

[0017] Preferable compounds according to group a) are one or more artinites (MgCO3(OH)2- 3H2O), one or more hydromagnesites (Mgs(CO3)4(OH)2-4H2O), and one or more dypingites (Mgs(CO3)4(OH)2-5H2O), and / or their mixtures.

[0018] The more preferred compound according to group a) is one or more hydromagnesite(s).

[0019] Suitable non-limiting examples for hydromagnesite(s) is / are one or more natural or synthetic hydromagnesite(s), and / or their mixtures.

[0020] The most preferred one or more natural or synthetic hydromagnesite(s) is magnesium carbonate hydroxide(s).

[0021] It is preferred that the total concentration of the one or more compound according to group a) is in the range of 10% to 45% by weight, preferably in the range of 15% to 40% by weight, more preferably in the range of 17.5% to 35% by weight, calculated to the total weight of composition A.

[0022] Compound(s) according to group b)

[0023] The composition A of the present invention comprises one or more clay mineral(s) as compound(s) according to group b). Preferably the one or more clay minerals are one or more kaolins, one or more smectites, one or more illites (also called hydromica or hydromuscovite), one or more vermiculites, one or more chlorites, one or more allophanes, and / or their mixtures.

[0024] Suitable non-limiting examples for the one or more clay mineral compound(s) of the kaolin group is / are kaolinite, serpentinite, dickite, halloysite, and nacrite, and / or their mixtures.

[0025] Suitable non-limiting examples for the one or more clay mineral compound(s) of the smectite group is / are bentonite, montmorillonite, beidellites, nontronite, and saponite, and / or their mixtures.

[0026] Suitable non-limiting examples for the one or more clay mineral compound(s) of the illite group is illite.

[0027] Suitable non-limiting examples for the one or more clay mineral compound(s) of the vermiculite group is vermiculite.

[0028] Suitable non-limiting examples for the one or more clay mineral compound(s) of the chlorite group is / are baileychlore, borocookeite, chamosite, clinochlore, cookeite, donbassite, gonyerite, nimite, pennantite, ripidolite, sudoite, and / or their mixtures.

[0029] Suitable non-limiting examples for the one or more clay mineral compound(s) of the allophanes group is / are allophane, hisingerite, imogoli, neotocite, zinalsite, and / or their mixtures.

[0030] Most preferably the one or more clay mineral compound(s) according to group b) is kaolin.

[0031] It is preferred that the total concentration of one or more clay mineral compound(s) is in the range of 5% to 35% by weight, preferably 10% to 30% by weight, more preferably 15% to 25% by weight, calculated to the total weight of composition A.

[0032] It is further preferred that the total concentration of kaolin is in the range of 5% to 35% by weight, preferably 10% to 30% by weight, more preferably 15% to 25% by weight, calculated to the total weight of composition A.

[0033] Weight ratio of compounds according to group a) to b) The composition A according to the invention is characterized by the weight ratio of the compound according to a) to compound according to b) which is in the range of 0.8 to 1 .2, preferably in the range of 0.9 to 1 .2.

[0034] Water concentration

[0035] The composition of the present invention comprises water at concentration 10% by weight or less, preferably less than 5% by weight, more preferably less than 1 % by weight, still more preferably less than 0.5% by weight, calculated to the total weight of composition A, more preferably composition A is anhydrous.

[0036] Most preferably the composition of the present invention is anhydrous. ‘Anhydrous’ within the meaning of the present invention denotes a composition where no water is added. The term does not exclude water that is bound in the raw materials or absorbed from the air.

[0037] The present disclosure is also directed to a bleaching composition A for keratin fibers, preferably human keratin fibers, more preferably for human hair, comprising: a) one or more natural or synthetic hydromagnesite(s), b) one or more clay mineral(s), c) one or more oxidizing agent(s), preferably one or more persalt(s) and / or peroxy salt(s), wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25, and wherein the total concentration of water is less than 10% by weight, preferably less than 5% by weight, more preferably less than 1 % by weight, still more preferably less than 0.5% by weight, calculated to the total weight of the composition, more preferably composition A is anhydrous, wherein the water bound by compound according to a) is not considered in the calculation of the total water concentration.

[0038] Compound(s) according to group c) The composition A of the present invention comprises one or more oxidizing agents as compound(s) according to group c).

[0039] Suitable non-limiting examples for the oxidizing agents are sodium persulphate (Na2S20s), ammonium persulphate ((NH4)2S20s), potassium persulfate (K2S2O8), hydrogen peroxide (H2O2), potassium dichromate (foC^Os), potassium chlorate (KCIO3), peroxydisulfuric acid (H2S2O8), peroxymonosulfuric acid (H2SO5), melamine hydroperoxide, sodium perborate (Na2H4B20s), sodium tetraborate (Na2B4O?), sodium periodate (NaICk).

[0040] The most preferred one or more oxidizing agents are sodium persulphate (Na2S20s), ammonium persulphate ((NH4)2S20s), and potassium persulfate (K2S2O8).

[0041] It is preferred that the total concentration of the one or more oxidizing agent(s), preferably the total concentration of one or more persalt(s) and / or peroxy salt(s), is in the range of 1 % to 60% by weight, preferably 2% to 50% by weight, more preferably in the range of 5% to 40% by weight, calculated to the total weight of the composition A.

[0042] Alkalizing agent(s) other than compound(s) according to group a)

[0043] The composition A comprises one or more alkalizing agent that is different from the one according to group a), preferably said alkalizing agent is one or more disilicate(s), one or more metasilicate(s), one or more carbonate(s), one or more bicarbonate(s), and / or their mixtures, more preferably said alkalizing agent is one or more disilicate(s) or one or more metasilicate(s), and / or their mixtures, and still more preferably the total concentration of said alkalizing agent is in the range of 1 % to 30% by weight, calculated to the total weight of composition A.

[0044] It is preferred that the total concentration of the one or more alkalizing agent(s) that is different from the one according to group a) is in the range of 1 % to 30% by weight, preferably 5% to 25% by weight, more preferably in the range of 10% to 20% by weight, calculated to the total weight of the composition A.

[0045] Composition A - Bleaching powder

[0046] The composition A according to the invention can be a bleaching powder composition, preferably an anhydrous bleaching powder composition, and preferably composition A comprises one or more pulverulent excipients selected from organic / inorganic materials such as diatomaceous earth, cellulose, starch especially com, tapioca, rice, wheat and potato, nylon powder, gypsum, sawdust and perlite, and more preferably the total concentration of said pulverulent excipients in composition A is in the range of 10% to 50% by weight, preferably 15% to 40% by weight, calculated to the total weight of composition A.

[0047] The term ‘excipient’ within the meaning of the present invention denotes a compound that does not react with any of the components of the bleaching composition - is an inactive substance - and serves as the vehicle or medium for other active substance(s). The excipient constitutes the base on which the formula of cosmetic product rests.

[0048] Composition A - Oil composition

[0049] The composition A according to the invention may be an oil composition comprising one or more lipophilic compound(s) liquid at 20°C and atmospheric pressure, preferably said compound(s) are selected from fatty alcohols, fatty acids, waxes, vegetable oils, petrolatum -based products, silicones, aminated silicones, and compounds according to the general structure: wherein R1is selected from linear or branched, saturated or unsaturated alkyl with Ci 1 to C21 and optionally modified with 1 hydroxyl group, and R2is selected from linear or branched, saturated or unsaturated alkyl with C3 to Cis. Suitable compounds according to the general structure from above are isopropyl palmitate, isopropyl myristate, octyl palmitate, isocetyl palmitate, octyl stearate, oleyl oleate, ethylhexyl hydroxystearate, myristyl myristate, behenyl behenate, and / or their mixtures.

[0050] Preferably, the total concentration of one or more lipophilic compound(s) liquid at 20 °C at atmospheric pressure in composition A is in the range of 10% to 50% by weight, preferably 15% to 40% by weight, calculated to the total weight of composition A.

[0051] Thickeners The composition A according to any of the preceding may comprise one or more thickener(s) according to group d), preferably the one or more thickening polymers are selected from non-ionic thickening polymers such as the cellulose-based polymers methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethyl-methylcellulose, and alkylated hydroxyl celluloses such as (C2-C8)-alkylcelluloses or cetyl hydroxyethylcellulose, anionic thickening polymers such as the naturally-based anionic polymers and / or synthetic anionic polymers hypromellose, xanthan gum, dehydroxanthan gum, hydroxypropylxanthan gum, carboxymethyl cellulose, and starch-based polymers such as vegetable starch and / or their synthetically modified derivatives such as hydroxypropyl starch phosphate, or the alginic acids, sodium alginates, ammonium alginates, calcium alginates, gum arabic, and quar gum, preferably the one or more thickening polymers are cellulose, hypromellose, xanthan gum and / or dehydroxanthan gum.

[0052] Preferably, composition A comprises thickeners at a total concentration in the range of 1 % to 10% by weight, more preferably in the range of 3% to 7% by weight, calculated to the total weight of composition A.

[0053] Surfactants

[0054] Furthermore, the composition of the present invention can comprise one or more additional hair conditioning compounds selected from synthetic oils, natural oils, cationic surfactants, anionic surfactants, or non-ionic surfactants.

[0055] Two-part bleaching and / or lightening composition

[0056] Another object of the invention is a two-part bleaching and / or lightening composition for keratin fibers, preferably human hair, wherein the first composition is the composition A as described above, and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6, preferably in the range of 2 to 4, more preferably 2.5 to 4.

[0057] Preferably, the total concentration of hydrogen peroxide in composition B is in the range of 1 % to 30% by weight, preferably in the range of 2% to 25% by weight, more preferably in the range of 3% to 20% by weight, calculated to the total weight of composition B. Compositions A and B are kept separate until directly prior to application onto the keratin fibers.

[0058] Kit for keratin fibers

[0059] Another object of the invention is the kit for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising the compositions A and B as defined above and at least one further composition selected from: a) an aqueous composition comprising one or more conditioning ingredients b) an aqueous composition comprising one or more oxidative dye(s) and / or direct dye(s), c) an aqueous composition comprising one or more cleansing surfactant(s).

[0060] A Ready -to-use bleaching and / or lightening composition

[0061] Another object of the invention is a ready-to-use bleaching and / or lightening composition for keratin fibers, preferably human hair, having a pH in the range of 9 to 11 comprising the compound(s) a), b), and c) as defined above, and hydrogen peroxide, wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25.

[0062] Preferably, the ready-to-use composition is an aqueous composition with total water concentration of 50% by weight or more, calculated to the total weight of the ready-to- use composition.

[0063] The composition A according to the invention is characterized by the weight ratio of the compound according to a) to compound according to b) in the ready-to-use composition is in the range of 0.8 to 1 .2, preferably in the range of 0.9 to 1 .2.

[0064] The pH for the present invention is measured with a glass electrode at 25°C and under atmospheric conditions.

[0065] Preferably, the viscosity of the ready-to-use mixture is in the range of 50,000 mPas to 100,000 mPas, measured with a Brookfield RV viscometer at 25°C and spindle number 6 at 10 rpm. Process for bleaching keratin fibers

[0066] Still another object of the invention is the process for bleaching keratin fibers, preferably human keratin fibers, more preferably for human hair comprising the steps: i) optionally washing the hair with a cleansing composition and drying the hair, then ii) mixing the bleaching and / or lightening composition A according to any of the as defined above prepare the ready-to-use composition as defined above; then iii) applying the ready-to-use composition onto hair for period of 1 to 45 min, preferably 10 to 45 min, more preferably 25 to 45 min; then iv) rinsing off the hair with water or optionally washing with a cleansing composition; then v) optionally drying the hair.

[0067] The following examples are to illustrate the invention, but not to limit it.

[0068] EXAMPLES

[0069] Table 1 : Powder compositions representing composition A according to the invention with a weight ratio of kaolin to magnesium hydroxide carbonate of around 1 :1 and two comparative formulations with different weight ratios of kaolin to magnesium hydroxide carbonate: comparative experiment 1 with a weight ratio around 1 :4 and comparative experiment 2 with a weight ratio around 1 :2.

[0070] The viscosities of the above-mentioned compositions were 65,000 mPas ± 5,000 mPas, measured with a Brookfield RV viscometer at 25°C with spindle 6 at 10 rpm.

[0071] Composition B

[0072] % by weight

[0073] Hydrogen peroxide 6.0

[0074] EDTA 0.5

[0075] Phosphoric acid ad pH 2.5 Water ad 100.0 Discussion of results

[0076] The results clearly show (see Table 1 , Invention) that the inventive composition was easier to mix than the comparative compositions, regardless of the operator.

[0077] In the experiments (see Table 1 ), 5 different stylists with different anthropometric parameters and different physical strength mixed the ready-to-use composition according to the invention and the comparative compositions 1 and 2. The results clearly show that the composition according to the invention solves the mentioned problems and reduces the mixing time. All stylists, regardless of their physical strength, took less time to mix the ready-to-use composition according to the invention.

[0078] Methods

[0079] Three different bleach powders were prepared for the experiments (see Table 1 ). 25 g of the above powder compositions and 35 g of composition B were added to a standard coloring bowl and mixed with a brush. The time from the start of mixing to the point when a uniform bleaching mass was obtained was measured with a stopwatch.

Claims

Claims1 . A bleaching composition A for keratin fibers, preferably human keratin fibers, more preferably for human hair, comprising: a) one or more magnesium carbonate minerals according to general structure Mgx(CO3)y-(OH)2-zH2O, wherein x represents an integer in the range of 1 to 6, preferably x is an integer in the range of 1 to 5, y is an integer in the range of 1 to 4, and z is an integer in the range of 0 to 6, preferably the z in an integer in the range of 1 to 5, more preferably z is an integer in the range of 3 to 4, b) one or more clay mineral(s), c) one or more oxidizing agent(s), preferably one or more persalt(s) and / or peroxy salt(s), wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25, and wherein the total concentration of water is less than 10% by weight, preferably less than 5% by weight, more preferably less than 1 % by weight, still more preferably less than 0.5% by weight, calculated to the total weight of composition A, more preferably composition A is anhydrous.

2. The composition according to claim 1 characterized in that the one or more compound(s) according to group a) is / are one or more artinites, one or more hydromagnesites, and one or more dypingites, and / or their mixtures, more preferably the compound according to group a) is one or more hydromagnesite(s), still more preferably the one or more compound(s) according to group a) is / are selected from one or more natural and / or synthetic magnesium carbonate hydroxide(s).

3. The composition according to any of the claims 1 and / or 2 characterized in that the total concentration of one or more compound(s) according to group a) is in the range of 10% to 45% by weight, preferably in the range of 15% to 40% by weight, more preferably in the range of 17.5% to 35% by weight, calculated to the total weight of composition A.

4. The composition according to any of the preceding claims characterized in that one or more compound(s) according to group b) is / are one or more kaolins, one ormore smectites, one or more illites, one or more vermiculites, one or more chlorites, one or more allophanes, and / or their mixtures; preferably the one or more compound(s) according to group b) is selected from bentonite, montmorillonite, beidellites, nontronite, saponite, illite, vermiculite, chlorite, allophane, baileychlore, borocookeite, chamosite, clinochlore, cookeite, donbassite, gonyerite, nimite, pennantite, ripidolite, sudoite, hisingerite, imogoli, neotocite, zinalsite, and / or their mixtures, more preferably one or more compound(s) according to group b) is kaolin.

5. The composition according to any of the preceding claims characterized in that the total concentration of one or more compound(s) according to group b) is in the range of 5% to 35% by weight, preferably 10% to 30% by weight, more preferably 15% to 25% by weight, calculated to the total weight of composition A.

6. The composition according to any of the preceding claims characterized in that the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.8 to 1 .2, preferably in the range of 0.9 to 1 .2.

7. The composition according to any of the preceding claims characterized in that the one or more compound(s) according to group c) is sodium persulphate, ammonium persulphate, potassium persulfate, potassium dichromate, potassium perchlorate, peroxydisulfuric acid, peroxymonosulfuric acid, melanin peroxide, sodium perborate, sodium tetraborate, and / or their mixtures, preferably one or more compound(s) according to group c) is / are sodium persulphate, ammonium persulphate, potassium persulfate, and / or their mixtures.

8. The composition according to any of the preceding claims characterized in that the total concentration of oxidizing agent(s) according to group b) is in the range of 1 % to 60% by weight, preferably in the range of 2% to 50% by weight, more preferably in the range of 5% to 40% by weight, calculated to the total weight of composition A.

9. The composition according to any of the preceding claims characterized in that composition A comprises one or more alkalizing agents that is / are different from the one according to group a), preferably said alkalizing agent is one or more disilicate(s), one or more metasilicate(s), one or more carbonate(s), one or more bicarbonate(s), and / or their mixtures, more preferably said alkalizing agent is one or more disilicate(s) or one or more metasilicate(s), and / or their mixtures, and still morepreferably the total concentration of said alkalizing agent is in the range of 1 % to 30% by weight, calculated to the total weight of composition A.

10. The composition according to any of the preceding claims characterized in that composition A is a bleaching powder composition, preferably an anhydrous bleaching powder composition, and more preferably composition A comprises one or more pulverulent excipients selected from organic / inorganic materials such as diatomaceous earth, cellulose, starch especially corn, tapioca, rice, wheat and potato, nylon powder, gypsum, sawdust and perlite, and more preferably the total concentration of said pulverulent excipients in composition A is in the range of 10% to 50% by weight, preferably 15% to 40% by weight, calculated to the total weight of composition A.11 . The composition according to any of the claims 1 to 9 characterized in that composition A is an oil composition comprising one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure, preferably said lipophilic compound(s) are selected from fatty alcohols, fatty acids, waxes, vegetable oils, petrolatum -based products, silicones, aminated silicones, and compounds according to the general structure:wherein R1is selected from linear or branched, saturated or unsaturated alkyl with Ci 1 to C21 and optionally modified with 1 hydroxyl group, and R2is selected from linear or branched, saturated or unsaturated alkyl with C3 to Cis, more preferably said lipophilic compounds is / are isopropyl palmitate, isopropyl myristate, octyl palmitate, isocetyl palmitate, octyl stearate, oleyl oleate, ethylhexyl hydroxystearate, myristyl myristate, behenyl behenate, and / or their mixtures.

12. A two-part bleaching and / or lightening composition for keratin fibers, preferably human hair, wherein the first composition A is a composition according to any of the claims 1 to 11 and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6.

13. Kit for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising the compositions A and B as defined in any of the claims 1 to 12 and at least one further composition selected from: a) an aqueous composition comprising one or more conditioning ingredients, b) an aqueous composition comprising one or more oxidative dye(s) and / or direct dye(s), c) an aqueous composition comprising one or more cleansing surfactant(s).

14. A ready-to-use bleaching and / or lightening composition for keratin fibers, preferably human hair, having a pH in the range of 9 to 11 comprising the compound(s) a), b), and c) as defined in any of the claims 1 to 12, and hydrogen peroxide, wherein the weight ratio of compound(s) according to group a) to compound(s) according to group b) is in the range of 0.75 to 1 .25.

15. Process for bleaching keratin fibers, preferably human keratin fibers, more preferably for human hair comprising the steps: i) optionally washing the hair with a cleansing composition and drying the hair, then ii) mixing the bleaching and / or lightening composition A according to any of the claims 1 to 11 with the aqueous composition B as defined in claim 12 to prepare the ready-to-use composition as defined in the claim 14; then iii) applying the ready-to-use composition onto hair for period of 1 to 45 min, preferably 10 to 45 min, more preferably 25 to 45 min; then iv) rinsing off the hair with water or optionally washing with a cleansing composition; then v) optionally drying the hair.

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