Scalp protection composition
A nano-emulsion-based scalp protection composition addresses scalp irritation from hair dyeing and perming by using myristyl myristate and other ingredients, providing effective and stable protection against discomfort.
Patent Information
- Application Number
- PCT/CN2024/079200
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-09-04
AI Technical Summary
Existing hair dyeing and perming products cause scalp irritation and discomfort due to their strong alkalinity, and existing scalp protection agents, such as dimethicone and mineral oil, provide incomplete protection and can burden the scalp, while biomolecules like collagen protein and amino acids are less stable and expensive.
A scalp protection composition comprising a nano-emulsion made from myristyl myristate, ceteareth-12, glyceryl stearate, cetearyl alcohol, cetyl palmitate, ceteareth-20, potassium or sodium cetyl phosphate, preservative, lactic acid, glycerin, and water, combined with thickeners, to form a stable emulsion that protects the scalp during hair dyeing and perming.
The composition effectively reduces scalp discomfort, including itching, stinging, tightness, and burning, during and after hair dyeing and perming, while being cost-efficient and stable.
Smart Images

Figure PCTCN2024079200-FTAPPB-I100001 
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Figure PCTCN2024079200-FTAPPB-I100003
Abstract
Description
Scalp Protection CompositionTechnical field
[0001] The present disclosure relates to a scalp protection composition, and more particularly to a scalp protection composition which can be used before hair dying and / or perming to protect the scalp from damages or discomfort caused by hair dyeing and perming agents.Background of the invention
[0002] Nowadays, changing the color and / or shape of hair has become popular among people of all ages and sexes. However, most of the commercially available hair dyeing and perming products are strong alkaline substances. When these hair products come into contact the user's scalp, damages or discomforts of the scalp may be caused, causing irritation, redness, itching, etc. Therefore, in order to protect the scalp from the damages or discomforts in the harsh conditions, a scalp protection agent can be applied to the scalp before applying hair dyeing and perming agents to the hair.
[0003] At present, the strong alkali-resistant dimethicone or mineral oil contained in the scalp protectants can isolate the scalp from hair dyeing and perming agents and achieve the effect of protecting the scalp. However, these compounds cannot offer complete protection and alleviation of scalp discomfort, and also can burden the scalp. Some prior arts propose adding biomolecules to alleviate the scalp stimulation, for example CN101289686 teaches using collagen protein and KR101277530B1 suggests adding amino acids. However, biomolecules are less stable in the composition and relatively expensive.
[0004] Therefore, there is still a need in the art to develop a scalp protection composition having excellent protection effect and cost efficient.Summary of the invention
[0005] It is an object of the present invention to provide a scalp protection composition addressing one or more problems of the prior art and having excellent protection effect for scalp.
[0006] The object of the present invention is achieved by a scalp protection composition comprising:
[0007] (a) a nano-emulsion prepared from a mixture of:
[0008] (a1) 10.0-20.0wt%of myristyl myristate,
[0009] (a2) 5.0-10.0 wt%of ceteareth-12,
[0010] (a3) 1.0-5.0 wt%of glyceryl stearate,
[0011] (a4) 0.01-1.0 wt%of cetearyl alcohol,
[0012] (a5) 0.35-0.75 wt%of cetyl palmitate,
[0013] (a6) 0.7-1.5 wt%of ceteareth-20,
[0014] (a7) 0.01-1.0 wt%of potassium cetyl phosphate and / or sodium cetyl phosphate,
[0015] (a8) 0-0.5 wt%of a preservative, such as sodium benzoate,
[0016] (a9) 0.05-0.5 wt%of lactic acid or salts thereof,
[0017] (a10) 10.0-30.0 wt%of glycerin, and
[0018] (a11) 40.0-60.0 wt%of water,
[0019] each wt%of (a1) to (a11) is based on the total weight of (a1) to (a11) ; and
[0020] (b) one or more thickeners.
[0021] The present invention also provides a method for preparing the scalp protection composition, comprising:
[0022] (i) preparing the nano-emulsion from ingredients (a1) to (a11) by a high-shear stirring method, a phase inversion temperature (PIT) method, or a phase inversion composition (PIC) method, preferably by a PIT method;
[0023] (ii) mixing the nano-emulsion with the thickener (s) and water by stirring to form a homogeneous mixture.
[0024] The present invention also relates to use of the scalp protection composition for protecting scalp before hair dyeing or perming.Detailed description of the invention
[0025] It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only and is not intended as limiting the broader aspects of the present invention. Each aspect so described may be combined with any other aspect (s) unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.
[0026] Unless specified otherwise, in the context of the present invention, the terms used are to be construed in accordance with the following definitions.
[0027] Unless specified otherwise, as used herein, the terms “a” , “an” and “the” include both singular and plural referents.
[0028] The terms “comprising” and “comprises” as used herein are synonymous with “including” , “includes” or “containing” , “contains” , and are inclusive or open-ended and do not exclude additional, non-recited members, elements or process steps.
[0029] The term “consisting of” as used herein is close-ended and exclude additional, non-recited intentionally added members, elements or process steps.
[0030] The term “at least one” or “one or more” used herein to define a component refers to the type of the component, and not to the absolute number of molecules.
[0031] The terms “about” , “around” and the like used herein in connection with a numerical value refer to the numerical value ±10%, preferably ±5%. All numerical values herein should be interpreted as being modified by the term “about” .
[0032] Unless specified otherwise, the recitation of numerical end points includes all numbers and fractions subsumed within the respective ranges, as well as the recited end points.
[0033] Unless otherwise defined, all terms used in the present invention, including technical and scientific terms, have the meaning as commonly understood by one of the ordinary skilled in the art to which this invention belongs.
[0034] Hereinafter, each component will be described in detail.
[0035] Component (a)
[0036] The nano-emulsion of component (a) is a necessary and important component of the composition and plays an important role for the scalp protection.
[0037] The term “nano-emulsion” used herein has common meaning in the art, and refers to a stable dispersion of nanoscale droplets of one fluid within another fluid. In the present invention, the nano-emulsion is an oil-in-water nano-emulsion.
[0038] The nano-emulsion useful in the present invention is formed and prepared from a mixture of:
[0039] (a1) 10.0-20.0wt%, preferably 12.0-18.0 wt%of myristyl myristate,
[0040] such as 12 wt%, 14 wt%, 16 wt%, 18 wt%or any ranges between the listed values of myristyl myristate;
[0041] (a2) 5.0-10.0 wt%, preferably 7.5-10.0 wt%of ceteareth-12,
[0042] such as 6 wt%, 7 wt%, 8 wt%, 9 wt%or any ranges between the listed values of ceteareth-12;
[0043] (a3) 1.0-5.0 wt%, preferably 1.1-4.9 wt%of glyceryl stearate,
[0044] such as 2 wt%, 3 wt%, 4 wt%or any ranges between the listed values of glyceryl stearate;
[0045] (a4) 0.01-1.0 wt%, preferably 0.05-0.9 wt%of cetearyl alcohol,
[0046] such as 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%or any ranges between the listed values of cetearyl alcohol;
[0047] (a5) 0.35-0.75 wt%, preferably 0.38-0.70 wt%of cetyl palmitate,
[0048] such as 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%or any ranges between the listed values of cetyl palmitate;
[0049] (a6) 0.7-1.5 wt%, preferably 0.8-1.4 wt%of ceteareth-20,
[0050] such as 0.8 wt%, 0.9 wt%, 1.0 wt%, 1.2 wt%, 1.4 wt%or any ranges between the listed values of ceteareth-20;
[0051] (a7) 0.01-1.0 wt%, preferably 0.02-0.8 wt%of potassium cetyl phosphate and / or sodium cetyl phosphate,
[0052] such as 0.1 wt%, 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%or any ranges between the listed values of potassium cetyl phosphate and / or sodium cetyl phosphate;
[0053] (a8) 0-0.5 wt%, preferably 0.1-0.4 wt%of a preservative, such as sodium benzoate,
[0054] such as 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%or any ranges between the listed values of sodium benzoate;
[0055] (a9) 0.05-0.5 wt%, preferably 0.1-0.5 wt%of lactic acid or salts thereof,
[0056] such as 0.2 wt%, 0.3 wt%, 0.4 wt%or any ranges between the listed values of lactic acid or salts thereof;
[0057] (a10) 10.0-30.0 wt%, preferably 15.0-25.0 wt%of glycrin,
[0058] such as 12 wt%, 14 wt%, 16 wt%, 18 wt%, 20 wt%, 22, 24 wt%, 26 wt%, 28 wt% or any ranges between the listed values of glycerin;
[0059] (a11) 40.0-60.0 wt%, preferably 45.0-55.0 wt%of water,
[0060] such as 42 wt%, 44 wt%, 46 wt%, 48 wt%, 50 wt%, 52 wt%, 54 wt%, 56 wt%, 58 wt%or any ranges between the listed values of water.
[0061] each wt%here is based on the total weight of (a1) to (a11) .
[0062] The nano-emulsion used in the present invention can be obtained through known methods in the art, such as a high-shear stirring method, a phase inversion temperature (PIT) method, or a phase inversion composition (PIC) method. Although the preparation method of the nano-emulsion is not particularly limited, the PIT method is preferred from the perspective of energy saving.
[0063] As for the PIT method, all ingredients (a1) to (a11) listed as above can be mixed together at room temperature to form a homogeneous mixture, then the mixture is heated to above 75 ℃ but preferably less than 100 ℃, such as 77 ℃, 79 ℃, 80 ℃, 82 ℃, 84 ℃, 86 ℃, 88 ℃, 90 ℃; alternatively, each ingredient can be heated separately to the above temperature and then mixed together homogeneously; then, the heated mixture is cooled down rapidly, for example, in ice bath, to room temperature, and all the above steps are preferably preformed under stirring. Through the PIT method, microdroplets in the nano-emulsion have an orthorhombic lateral packing structure.
[0064] The term “room temperature” used herein means a temperature of 25 ± 2℃.
[0065] The order of addition of (a1) to (a11) is not particularly limited, they can be mixed altogether or mixed one by one, or two by two, and so on.
[0066] Preferably, microdroplets in the nano-emulsion have an average particle size of 20-500 nm, more preferably of 20-300 nm, such as 20-150 nm, 40 nm, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, 200 nm, 220 nm, 240 nm, 260 nm, 280 nm, 300 nm, 320 nm, 340 nm, 360 nm, 380 nm, 400 nm, 420 nm, 440 nm, 460 nm, 480 nm or any ranges between the above listed values, determined with Malvern Nano ZS90 using dynamic light scattering method.
[0067] In order to achieve a highly stabile nano-emulsion at room temperature, it is preferred that the zeta potential of the nano-emulsion is more than 20 mV at room temperature, preferably more than 30 mV at room temperature, for example 20-50 mV at room temperature, determined with Malvern Nano ZS90.
[0068] The nano-emulsion can be contained in the scalp protection composition in an amount of 4-20 wt%, more preferably 5-15 wt%, such as 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt%, 20 wt%, or any ranges between the above listed values, based on the total weight of the scalp protection composition.
[0069] Component (b)
[0070] In order to achieve a suitable viscosity, the scalp protection composition can comprise one or more thickeners.
[0071] The thickeners useful in the present invention can be polymer thickeners including non-ionic thickeners and anionic thickeners, or mixtures thereof. Suitable non-ionic thickeners include polyacrylamide polymers, crosslinked poly (N-vinylpyrrolidones) , polysaccharides, natural or synthetic gums or polysaccharides, polyvinylpyrrolidone, and polyvinylalcohol. Suitable anionic thickeners include acrylic acid / ethyl acrylate copolymers, carboxyvinyl polymers and crosslinked copolymers of alkyl vinyl ethers and maleic anhydride.
[0072] The thickeners useful in the present invention can also be polysaccharides including cellulose, carboxymethyl hydroxyethylcellulose, cellulose acetate propionate carboxylate, hydroxyethylcellulose, hydroxyethyl ethylcellulose, hydroxypropylcellulose, hydroxypropyl methylcellulose, methyl hydroxyethylcellulose, microcrystalline cellulose, sodium cellulose sulfate, and mixtures thereof; natural gums like acacia, agar, alginic acid, ammonium alginate, amylopectin, calcium alginate, calcium carrageenan, carnitine, carrageenan, dextrin, gelatin, gellan gum, guar gum, guar hydroxypropyltrimonium chloride, hydroxypropyl chitosan, hydroxypropyl guar, karaya gum, kelp, locust bean gum, natto gum, potassium alginate, potassium carrageenan, propylene glycol alginate, sclerotium gum, sodium carboxymethyl dextran, sodium carrageenan, tragacanth gum, xanthan gum, and mixtures thereof.
[0073] The amount of the thickener is not particularly limited, and can be adjusted according to the desired form of the scalp protection composition. For example, the amount of the thickener (s) can be 0.01-5wt%, preferably 0.1-4 wt%, more preferably 0.15-2 wt%, such as 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%or any ranges between two listed values, based on the total weight of the scalp protection composition.
[0074] In one embodiment, 0.05-1 wt%of thickener can be added so as to obtain a composition having a viscosity of less than 4000 mPa·sat room temperature, determined by Brookfield RVDV II+ viscometer, at 20 rpm, Spindle No: 4.
[0075] Other components
[0076] In addition to the above components (a) and (b) , the scalp protection composition can comprise other conventional additive (s) , for example, panthenol; allantoin; a pH adjusting agent, such as alkali metal hydroxides (e.g., NaOH, KOH) , or an acid such as lactic acid; a chelating agent like EDTA Na2; a preservative; and so on.
[0077] Panthenol and / or allantoin can be used together with the above-mentioned nano-emulsion to achieve optimal scalp protection effect, especially significantly reducing itching and burning of the scalp during or after hair dyeing or perming.
[0078] If present, the suitable amount of panthenol in the scalp protection composition is 0.05-5 wt%, preferably 0.05-3 wt%, preferably 0.1-2.5 wt%, such as 0.1 wt%, 0.3 wt%, 0.6 wt%, 0.8 wt%, 1.0 wt%, 1.2 wt%, 1.4 wt%, 1.6 wt%, 1.8 wt%, 2.0 wt%, 2.4 wt%, 2.8 wt%, 3.0 wt%, 3.4 wt%, 3.8 wt%, 4.0 wt%, 4.4 wt%, 4.8 wt%or any ranges between two listed values, based on the total weight of the scalp protection composition.
[0079] If present, the suitable amount of allantoin in the scalp protection composition is 0.05-0.5 wt%, preferably 0.08-0.45 wt%, such as 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%or any ranges between two listed values, based on the total weight of the scalp protection composition.
[0080] Preferable, the pH of the scalp protection composition has a pH in the range of 4-8, more preferably, 5-7.5.
[0081] Besides all the components discussed above, the rest of the scalp protection composition can be water. In other words, the scalp protection composition of the present invention is water-based, preferably, water is comprised in an amount of no less than 75 wt%, more preferably 80-97 wt%, even more preferably 85-96 wt%, based on the total weight of the scalp protection composition.
[0082] Method for preparing the scalp protection composition
[0083] In another aspect of the present invention, a method for preparing the scalp protection composition is provided, comprising:
[0084] (i) preparing the nano-emulsion from above ingredients (a1) to (a11) by a high-shear stirring method, a phase inversion temperature (PIT) method, or a phase inversion composition (PIC) method, preferably by a PIT method;
[0085] (ii) mixing the nano-emulsion with the thickener (s) and water by stirring to form a homogeneous mixture.
[0086] Step (ii) can be carried out at room temperature.
[0087] Examples
[0088] The invention will now be described by way of the following examples. The following examples are intended to assist one skilled in the art to better understand and practice the present invention. The scope of the invention is not limited by the examples but is defined in the appended claims. All parts and percentages are based on weight unless otherwise stated. In all examples, the same name refers to the same substance.
[0089] Nano-emulsions
[0090] Nano-emulsions 1-5 were prepared according to the ingredients and amounts listed in Table 1, each amount in Table 1 being wt%based on the total weight of the nano-emulsion.
[0091] Taking nano-emulsion 1 as example, the preparation method was as follows.
[0092] (1) Mixing (a1) to (a6) together and heating to 80 ℃ under stirring to form a mixture 1;
[0093] (2) Mixing (a7) to (a10) and heating to 80 ℃ under stirring to form a mixture 2;
[0094] (3) Mixing the mixture 1 and 2 together at 80 ℃ under stirring to form a mixture 3; and
[0095] (4) Rapidly cooling the mixture 3 in an ice bath to room temperature under stirring to form a homogeneous nano-emulsion.
[0096] Nano-emulsions 2-5 were prepared using the same method except for using ingredients and amounts listed in Table 1.
[0097] Table 1: Nano-emulsions 1-5
[0098] Scalp protection compositions 1 to 4
[0099] The scalp protection compositions 1 to 4 were obtained by mixing the components listed in Table 2 at room temperature.
[0100] Table 2 #Carbomer 980 is a polyacrylic acid thickener *Euxyl PE 9010 is a blend of Phenoxyethanol and Ethylhexylglycerin, as preservative, from Schuelke.
[0101] Test for scalp protection effect
[0102] In the half-head model testing, one composition was evenly applied on one side of the head to fully cover the scalp of this side, while the other composition was evenly applied on the other side of the head to fully cover the scalp of this side. The applied amount of the composition per half head was approximately 3-4 g. Subsequently, a regular hair dyeing process was performed, and the model's scalp response was assessed using a 3S (Scalp-Symptom-Scale) questionnaire. The levels of five symptoms (itching, stinging, tightness, pain, and burning sensation) based on personal tolerance were rated. The scoring criteria range was from 0 to 4, higher scores indicating more pronounced symptoms.
[0103] Half-head model tests were conducted using composition 1 (BM) and composition 3 (Invention) (Test 1, in Table 3) , composition 2 (Com) and composition 3 (Invention) (Test 2, in Table 4) , as well as composition 3 (Invention) and composition 4 (Invention) (Test 3, in Table 5) . In one half-head test, the dyeing agent was the same, but in different tests, the dyeing agents were different. The test results are shown in Tables 3 to 5, respectively.
[0104] Table 3
[0105] It can be seen from the results in Table 3 that comparing with benchmark without nano-emulsion, composition 3 of the invention can significantly reduce discomfort (including itching, tightness and burning) during dyeing and after dyeing.
[0106] Table 4
[0107] It can be seen from the results in Table 4 that comparing with composition 2 containing 3%nano-emulsion, composition 3 of the invention containing 5%nano-emulsion can further reduce discomfort (including itching, stinging, tightness, pain and burning) during dyeing and after dyeing.
[0108] Table 5
[0109] It can be seen from the results in Table 5 that two compositions containing different thickening agents according to the present invention achieved comparable performance in terms of the scalp protection effect.
[0110] The results among the above half-head model tests 1 to 3 cannot be compared directly, because the dyeing agents used in Tests 1 to 3 are different. But the results in each test can be compared directly because the same dyeing agent is used in each test.
[0111] Although some preferred embodiments have been described, many modifications and variations may be made thereto in light of the above teachings. It is therefore to be understood that the invention may be practiced otherwise than as specifically described without departing from the scope of the appended claims.
Claims
1.A scalp protection composition comprising:(a) a nano-emulsion prepared from a mixture of:(a1) 10.0-20.0wt%of myristyl myristate,(a2) 5.0-10.0 wt%of ceteareth-12,(a3) 1.0-5.0 wt%of glyceryl stearate,(a4) 0.01-1.0 wt%of cetearyl alcohol,(a5) 0.35-0.75 wt%of cetyl palmitate,(a6) 0.7-1.5 wt%of ceteareth-20,(a7) 0.01-1.0 wt%of potassium cetyl phosphate and / or sodium cetyl phosphate,(a8) 0-0.5 wt%of a preservative, such as sodium benzoate,(a9) 0.05-0.5 wt%of lactic acid or salts thereof,(a10) 10.0-30.0 wt%of glycerin, and(a11) 40.0-60.0 wt%of water,each wt%of (a1) to (a11) is based on the total weight of (a1) to (a11) ; and(b) one or more thickeners.2.The scalp protection composition according to claim 1, wherein the nano-emulsion is prepared from a mixture of:(a1) 12.0-18.0 wt%of myristyl myristate,(a2) 7.5-10.0 wt%of ceteareth-12,(a3) 1.1-4.9 wt%of glyceryl stearate,(a4) 0.05-0.9 wt%of cetearyl alcohol,(a5) 0.38-0.70 wt%of cetyl palmitate,(a6) 0.8-1.4 wt%of ceteareth-20,(a7) 0.02-0.8 wt%of potassium cetyl phosphate and / or sodium cetyl phosphate,(a8) 0.1-0.4 wt%of a preservative, such as sodium benzoate,(a9) 0.1-0.5 wt%of lactic acid or salts thereof,(a10) 15.0-25.0 wt%of glycerin, and(a11) 45.0-55.0 wt%of water,each wt%of (a1) to (a11) is based on the total weight of (a1) to (a11) .3.The scalp protection composition according to claim 1 or 2, wherein the nano-emulsion is prepared by a high-shear stirring method, a phase inversion temperature (PIT) method, or a phase inversion composition (PIC) method, preferably by a phase inversion temperature (PIT) method.4.The scalp protection composition according to claim 3, wherein the phase inversion temperature (PIT) method includes:- mixing ingredients (a1) to (a11) together at room temperature to form a homogeneous mixture, and then heating the mixture to above 75 ℃ but preferably less than 100 ℃, and then rapidly cooling the heated mixture down to room temperature, for example by an ice bath;- alternatively, separately heating a mixture of some ingredients such as (a1) to (a6) and a mixture of other ingredients such as (a7) to (a11) to above 75 ℃ but preferably less than 100 ℃, and then mixing them together while keeping the temperature, and then rapidly cooling the heated mixture down to room temperature, for example by an ice bath;- alternatively, separately heating each of (a1) to (a11) to above 75 ℃ but preferably less than 100 ℃, and then mixing them together while keeping the temperature, and then rapidly cooling the heated mixture down to room temperature, for example by an ice bath;wherein the above steps are preferably preformed under stirring.5.The scalp protection composition according to any of claims 1 to 4, wherein microdroplets in the nano-emulsion have an average particle size of 20-500 nm, more preferably of 20-300 nm.6.The scalp protection composition according to any of claims 1 to 5, wherein the nano-emulsion has a zeta potential of more than 20 mV at room temperature, preferably more than 30 mV at room temperature, for example 20-50 mV at room temperature.7.The scalp protection composition according to any of claims 1 to 6, wherein the nano-emulsion is contained in the scalp protection composition in an amount of 4-20 wt%, preferably 5-15 wt%, based on the total weight of the scalp protection composition.8.The scalp protection composition according to any of claims 1 to 7, wherein the thickener is selected from:- non-ionic thickeners such as polyacrylamide polymers, crosslinked poly (N-vinylpyrrolidones) , polysaccharides, natural or synthetic gums or polysaccharides, polyvinylpyrrolidone, and polyvinylalcohol;- anionic thickeners such as acrylic acid / ethyl acrylate copolymers, carboxyvinyl polymers and crosslinked copolymers of alkyl vinyl ethers and maleic anhydride;- polysaccharides such as cellulose, carboxymethyl hydroxyethylcellulose, cellulose acetate propionate carboxylate, hydroxyethylcellulose, hydroxyethyl ethylcellulose, hydroxypropylcellulose, hydroxypropyl methylcellulose, methyl hydroxyethylcellulose, microcrystalline cellulose, sodium cellulose sulfate, and mixtures thereof,- natural gums such as acacia, agar, alginic acid, ammonium alginate, amylopectin, calcium alginate, calcium carrageenan, carnitine, carrageenan, dextrin, gelatin, gellan gum, guar gum, guar hydroxypropyltrimonium chloride, hydroxypropyl chitosan, hydroxypropyl guar, karaya gum, kelp, locust bean gum, natto gum, potassium alginate, potassium carrageenan, propylene glycol alginate, sclerotium gum, sodium carboxymethyl dextran, sodium carrageenan, tragacanth gum, xanthan gum, and mixtures thereof.9.The scalp protection composition according to any of claims 1 to 8, wherein the thickener is contained in the scalp protection composition in an amount of 0.01-5 wt%, preferably 0.1-4 wt%, based on the total weight of the scalp protection composition.10.The scalp protection composition according to any of claims 1 to 9, wherein the scalp protection composition further comprises one or more additives, preferably selected from panthenol, allantoin, a pH adjusting agent, a chelating agent and a preservative.11.The scalp protection composition according to any of claims 1 to 10, wherein the scalp protection composition has a pH in the range of 4-8, preferably of 5-7.5.12.The scalp protection composition according to any of claims 1 to 11, wherein the scalp protection composition has a water content of no less than 75 wt%, more preferably 80-97 wt%, based on the total weight of the scalp protection composition.13.A method for preparing the scalp protection composition of any of claims 1 to 12, comprising:(i) preparing the nano-emulsion from ingredients (a1) to (a11) by a high-shear stirring method, a phase inversion temperature (PIT) method, or a phase inversion composition (PIC) method, preferably by a PIT method;(ii) mixing the nano-emulsion with component (b) and water by stirring to form a homogeneous mixture.14.Use of the scalp protection composition of any of claims 1 to 12 for protecting scalp before hair dyeing or perming.
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