Transparent cosmetic composition containing ascorbic acid and a natural polymer
By using carrageenan as a stabilizer in cosmetic compositions, combined with specific concentrations of ascorbic acid and an aqueous medium, the instability of ascorbic acid in an aqueous medium is solved, achieving a transparent and stable skin care effect that meets the requirements for environmentally friendly cosmetic development.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LOREAL SA
- Filing Date
- 2024-10-22
- Publication Date
- 2026-06-05
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to a transparent water-based cosmetic composition comprising: At least 30 wt% water relative to the total weight of the composition. At least 5 wt% ascorbic acid relative to the total weight of the composition. At least 0.05 wt% of at least one carrageenan relative to the total weight of the composition, and The composition contains virtually no fatty phase and virtually no gelling agents other than carrageenan. The composition has a pH between 5 and 7. Background Technology
[0002] In cosmetic applications, ascorbic acid (vitamin C) is often added as an active agent, attributed to its ability to stimulate the synthesis of collagen, which is responsible for skin firmness, thus promoting skin regeneration, or as a depigmenting agent, because the vitamin reduces the production of melanin, which leads to brown spots. Ascorbic acid is also known for its antioxidant properties.
[0003] However, when ascorbic acid is introduced into aqueous media (such as emulsions or serums) at high concentrations (i.e., above 1 wt%, preferably above 5 wt%), its formulation is difficult to prepare due to its instability and significant discoloration. This discoloration can result in a brown color, which is unacceptable to consumers.
[0004] This is why serums or aqueous solutions containing powdered ascorbic acid are available on the market to dissolve immediately before use. The downside of this type of product is that vitamin C eventually degrades in aqueous media. Therefore, for practical reasons, consumers prefer serums that require no pretreatment, maintain color stability, and do not undergo chemical degradation, thus this type of product has lost its appeal.
[0005] Furthermore, the formulation of environmentally friendly cosmetic products (i.e., those designed and developed with environmental concerns in mind) is becoming a major focus in helping to address global challenges. Therefore, developing more sustainable compositions and / or preparation methods and / or ingredients to address these environmental challenges is becoming crucial.
[0006] In this context, it is important to develop new cosmetic compositions with a better carbon footprint, particularly by promoting the use of renewable raw materials and / or those with a good wilderness quality index and / or those of natural origin, and more particularly those of plant origin, while reducing the use of petrochemical-derived compounds.
[0007] Therefore, there is a need for an aqueous cosmetic composition containing ascorbic acid that is stable, meaning it retains the same color (usually white) and texture as initially, and does not cause degradation of the active agent. Summary of the Invention
[0008] Surprisingly, the applicant has discovered that using a carrageenan-type natural polymer at a concentration of at least 0.05 wt% relative to the total weight of the composition enables the production of a stable, transparent composition containing at least 5 wt% ascorbic acid, and the composition exhibits good sensory properties upon application.
[0009] Therefore, the present invention relates to a cosmetic composition comprising: At least 30 wt% water relative to the total weight of the composition. At least 5 wt% ascorbic acid relative to the total weight of the composition. At least 0.05 wt% of at least one carrageenan relative to the total weight of the composition, and The composition contains virtually no fatty phase and virtually no gelling agents other than carrageenan. The composition has a pH between 5 and 7.
[0010] The present invention also relates to a cosmetic method for caring for keratin materials, preferably skin, comprising applying a composition according to the invention to said keratin material.
[0011] Preferably, the composition according to the invention is an aqueous solution, more preferably an aqueous solution having a slightly gel-like appearance. Preferably, the composition according to the invention is a single-phase composition. This composition may be referred to as a "serum". The term "serum" means a composition having a fluid texture, a slightly gel-like appearance, being fluid, and preferably being rich in ascorbic acid (i.e., preferably at least 5 wt% ascorbic acid).
[0012] Preferably, the compositions according to the invention are substantially free of surfactants. "Substantially free of surfactants" means that the compositions according to the invention have a surfactant concentration between 0.01 wt% and 3 wt%, preferably between 0.1 wt% and 2 wt%, relative to the total weight of the composition. Preferably, the surfactants may consist of peptizers at a concentration between 0.01 and 3 wt%; these peptizers enable the dissolution of small amounts of oils or lipophilic compounds or fragrances (i.e., the concentration of fragrances or oils or lipophilic compounds is between 0.01% and 2%). The surfactants are preferably selected from nonionic surfactants. Preferably, the surfactants are selected from polyglycerol esters of C8-C12 fatty acids, acyl glucosides, and mixtures thereof; preferably, the surfactants are selected from polyglycerol esters containing four glycerol and C1 fatty acid units, cocoside, and mixtures thereof; preferably, the surfactants are selected from polyglycerol-4-decanoate, cocoside, and mixtures thereof.
[0013] Preferably, according to an alternative, the composition according to the invention contains no surfactants at all.
[0014] The compositions according to the invention are substantially free of a fatty phase. "Substantially free of a fatty phase" means that, relative to the total weight of the composition, the compositions according to the invention have a fatty phase concentration of less than or equal to 3 wt%, preferably less than or equal to 2 wt%, and more preferably less than or equal to 1 wt%. Preferably, the compositions according to the invention are completely free of a fatty phase.
[0015] The compositions according to the invention substantially do not contain any gelling agents other than carrageenan. "Substantially do not contain any gelling agents other than carrageenan" means that, relative to the total weight of the composition, the composition according to the invention has a concentration of gelling agents other than carrageenan of less than or equal to 1 wt%, preferably less than or equal to 0.5 wt%, preferably less than or equal to 0.3 wt%, preferably less than or equal to 0.2 wt%, and preferably less than or equal to 0.1 wt%. Preferably, the compositions according to the invention contain no gelling agents other than carrageenan at all. Gelling agents other than carrageenan are particularly selected from: natural gums, such as xanthan gum, guar gum, cellulose gum; carbomer; cellulose derivatives, such as hydroxyethyl cellulose, hydroxypropyl methylcellulose, hydroxypropyl cellulose, or hydroxymethyl cellulose; alginates; and polymers and copolymers containing 2-acrylamido-methylpropanesulfonic acid (AMPS) monomers.
[0016] Aqueous phase The compositions according to the invention contain water, which forms an aqueous phase.
[0017] The water used can be sterile softened water and / or floral water, such as rose water, cornflower water, chamomile water or linden water, and / or spring water or natural mineral water.
[0018] The composition contains at least 30 wt%, preferably at least 40 wt%, and more preferably at least 50 wt% water relative to the total weight of the composition.
[0019] Preferably, the composition contains 30 wt% to 93 wt%, more preferably 50 wt% to 90 wt%, and even more preferably 55 wt% to 75 wt% of water relative to the total weight of the composition.
[0020] The aqueous phase may also include at least one organic solvent that is soluble in water at 25°C.
[0021] Preferably, the water-soluble organic solvent is selected from alcohols, polyols, and mixtures thereof.
[0022] In alcohols, C1-C can be mentioned. 10 More preferably, C1-C5 alcohols, such as ethanol, isopropanol, propanol and butanol.
[0023] Preferably, the polyol is selected from polyols having 2 to 20 carbon atoms, more preferably 2 to 6 carbon atoms, such as glycerol, diglycerol, propylene glycol, isopentyl glycol, dipropylene glycol, butanediol, hexanediol, 1,3-propanediol, pentanediol, polyethylene glycol having 2 to 200 ethylene oxide units, and mixtures thereof.
[0024] Preferably, the water-soluble organic solvent is selected from polyols, and more preferably glycerol and / or hexanediol and / or pentanediol.
[0025] Preferably, the composition contains 1 wt% to 25 wt%, more preferably 2 wt% to 30 wt%, or even more preferably 5 wt% to 20 wt% of a water-soluble organic solvent relative to the total weight of the composition.
[0026] ascorbic acid Preferably, the ascorbic acid used for the purposes of this invention corresponds to L-ascorbic acid or vitamin C. It has a structure according to formula (I): [Chemical Formula 1] .
[0027] The composition contains at least 5 wt%, more preferably at least 7 wt%, and more preferably at least 10 wt% of ascorbic acid relative to the total weight of the composition.
[0028] Preferably, the composition contains 5 wt% to 20 wt%, more preferably 7 wt% to 20 wt%, and even more preferably 10 wt% to 15 wt% of ascorbic acid relative to the total weight of the composition.
[0029] Carrageenan The composition according to the invention contains at least 0.05 wt% of at least one carrageenan relative to the total weight of the composition.
[0030] Carrageenan is an anionic polysaccharide that constitutes the cell walls of various red algae (Rhodophyceae) belonging to the families Gigartinaceae, Hypneaceae, Furcellariaceae, and Polyideaceae. They are typically obtained from natural strains of these algae via hot water extraction. These linear polymers, formed by disaccharide structural units, consist of two D-galactopyranose units linked alternately by α(1,3) and β(1,4) bonds. They are highly sulfated polysaccharides (20-50%), and the α-D-galactopyranose residues can be in a 3,6-dehydrated form. Several types of carrageenan can be distinguished based on the number and position of the ester-sulfate groups on the repeating disaccharide molecule: κ-carrageenan with one ester-sulfate group, ι-carrageenan with two ester-sulfate groups, and λ-carrageenan with three ester-sulfate groups.
[0031] Carrageenan is basically composed of salts of potassium, sodium, magnesium, triethanolamine and / or calcium, as well as polysaccharide sulfate esters.
[0032] Preferably, the composition according to the invention comprises at least one ι-carrageenan.
[0033] Carrageenan is sold in particular by Seppic under the name Solagum, by Gelymar under the trade names Carragel, Carralact and Carrasol, by Cargill under the trade names SATIAGEL™ and SATIAGUM™, and by CP-Kelco under the trade names GENULACTA, GENUGEL and GENUVISCO.
[0034] Preferably, the composition according to the invention comprises at least one ι-carrageenan, particularly commercially available from Cargill under the name Satiagel VPC 508.
[0035] The composition according to the invention contains at least 0.05 wt%, preferably at least 0.1 wt%, and more preferably at least 0.2 wt% of at least one carrageenan relative to the total weight of the composition.
[0036] Preferably, the composition according to the invention contains 0.05 wt% to 2 wt%, more preferably 0.1 wt% to 1 wt%, and more preferably 0.2 wt% to 0.8 wt% of at least one carrageenan relative to the total weight of the composition.
[0037] pH of the composition The compositions according to the invention have a pH of 5.0 to 7.0. Advantageously, the pH of the compositions is between 5.5 and 6.5.
[0038] This pH effectively limits the color degradation of ascorbic acid, thereby limiting the composition from colorless to yellow or even brown over time.
[0039] Preferably, the cosmetic composition according to the invention comprises at least one alkali.
[0040] The base is particularly used to raise the final pH of the composition to between 5.0 and 7.0, preferably between 5.5 and 6.5.
[0041] The alkali can be selected from mineral alkalis, such as hydroxides of alkali metals, sodium hydroxide, or potassium hydroxide.
[0042] Preferably, the base of the composition is an alkali metal hydroxide, preferably sodium hydroxide or potassium hydroxide, with sodium hydroxide being more preferred. In fact, these bases are more advantageous than nitrogen-containing bases (such as triethanolamine) in terms of color stability (i.e., less yellowing).
[0043] Preferably, the base in the composition according to the invention is present in a base:ascorbic acid ratio of 0.22 to 0.30.
[0044] The composition may also contain one or more additives commonly used in cosmetic compositions, such as active ingredients, chelating agents, preservatives, or fragrances.
[0045] Preferably, among the active agents that can be used, anti-aging agents are preferred, especially adenosine, salicylic acid, glycolic acid, nicotinamide (vitamin B3) and / or tocopherol; or fragrances.
[0046] The compositions according to the present invention may contain at least one chelating agent.
[0047] Among preferred chelating agents, salts of ethylenediamine disuccinic acid may be mentioned.
[0048] Ethylenediamine disuccinic acid is a compound of formula (II): [Chemical Formula 3] (II) Preferably, the composition according to the invention contains 0.01 wt% to 2.5 wt%, more preferably 0.05 wt% to 1.5 wt%, and more preferably 0.07 wt% to 0.3 wt% of a chelating agent relative to the total weight of the composition.
[0049] The compositions according to the present invention may contain at least one preservative.
[0050] Among preferred preservatives, hydroxyacetophenone, phenoxyethanol, and mixtures thereof may be mentioned.
[0051] Preferably, the composition according to the invention contains 0.1 wt% to 2 wt%, more preferably 0.3 wt% to 1.5 wt%, and more preferably 0.5 wt% to 1 wt% of a preservative relative to the total weight of the composition.
[0052] Preferably, the composition according to the invention is transparent.
[0053] In the context of this invention, the term "transparent composition" refers to a composition with a turbidity value of less than 200 NTU, preferably less than 150 NTU, more preferably less than 100 NTU, more preferably less than 50 NTU, more preferably less than 15 NTU, more preferably less than 13 NTU, and more preferably less than 10 NTU. Preferably, the turbidity of the composition is equal to at least 1 NTU.
[0054] NTU (nephelometric turbidity units) is a unit used to measure the turbidity of a composition. Turbidity measurements were performed, for example, using a Hach 2100P turbidity meter with tube designation AR397A cat24347-06. Measurements were conducted at ambient temperature (20°C to 25°C).
[0055] Preferably, the composition is transparent and has a turbidity value between 1 and 15 NTU, preferably between 1 and 13 NTU.
[0056] Finally, the present invention also relates to a cosmetic method for caring for keratin materials, preferably skin, comprising applying a composition according to the invention to said keratin material. Detailed Implementation
[0057] Specific, but non-limiting, embodiments illustrating the invention will now be provided.
[0058] Example In the embodiments, unless otherwise stated, the pressure is atmospheric pressure. Unless otherwise stated, percentages are expressed as weight (%w / w) relative to the total weight of the composition.
[0059] Example 1: Compositions according to the present invention and comparative compositions A / Below, formulations A and B according to the present invention and comparative formulation CC1 are prepared according to the following schemes: In the first beaker (phase A): 1. Introduce water (T>60℃) and at 60℃, add the following components of phase A: glycerin, octane glycol, preservative, chelating agent, pentane glycol, sodium hyaluronate, and surfactant; 2. Once completely dissolved and with no crystal residue, cool the solution.
[0060] In the second beaker (phase B): 1. Introduce water at ambient temperature and add ascorbic acid to it; 2. Adjust the pH to 6 using sodium hydroxide; 3. Add carrageenan or polyquaternium-67, accompanied by moderate and prolonged stirring, to ensure effective utilization of the polymer.
[0061] Mix the contents of the two beakers, and dilute with water to QS if necessary.
[0062] Transparency assessment The physical turbidity is measured using a turbidimeter. If the turbidity value is less than 15 NTU, the formulation is considered to be transparent.
[0063] Evaluation of stickiness and gliding effect The results were conducted in vitro on synthetic skin (SkinFX) using a 10-person laboratory team, rated on a scale of 1 to 5. The results compared the stickiness and smoothness of the serum.
[0064] For stickiness, 1 indicates non-sticky, while 5 indicates very sticky.
[0065] For smoothness, 1 is not smooth and 5 is very smooth, with 3 being the score for bare skin.
[0066] Evaluation of the adhesive effect of the formulation during application: evaluation at 45 seconds and 2 minutes and 45 seconds after application: The reduction in stickiness upon application of fresh formulation was measured: a panel of 10 experts trained to replicate standardized assessment procedures involving the formulation evaluated the stickiness effect after 45 seconds of application (assessment scale from 1 to 5, where 1 indicates no stickiness and 5 indicates very stickiness).
[0067] The procedure for evaluating the stickiness effect is as follows: Apply 50µl of product to the back of one hand covered with a film mimicking skin texture. Using three fingers (index, middle, and ring fingers) of the other hand, massage in circular motions 15 times, holding for 15 seconds. Then wait 15 seconds, and then massage in circular motions 15 times, holding for 15 seconds.
[0068] At the end of 45 seconds, assess the stickiness effect by tactile evaluation using the finger with which the product was applied, tapping twice.
[0069] Whether the skin adheres is determined by a rating between 1 and 5 (based on an assessment scale of 1 to 5, where 1 indicates not sticky and 5 indicates very sticky). The assessment is conducted by a panel of at least 10 experts.
[0070] Between product tests, wash your fingers with a cloth dampened with warm water.
[0071] Evaluation of the smoothness effect of the formulation during application: Evaluation at 45 seconds and 2 minutes and 45 seconds after application: The increase in smoothness effect of fresh formulation upon application was measured: a panel of 10 experts trained to replicate standardized evaluation actions containing the formulation evaluated the smoothness effect 45 seconds after application (rating from 1 to 5, where 1 indicates no smoothness and 5 indicates high smoothness).
[0072] The procedure for evaluating the smoothness effect is as follows: Apply 50µl of product to the back of one hand covered with a film mimicking skin texture. Using three fingers (index, middle, and ring fingers) of the other hand, spread the product in a circular motion 15 times, holding for 15 seconds. Then wait 15 seconds, and then spread the product in a circular motion 15 times, holding for 15 seconds.
[0073] After 45 seconds, assess the smoothness effect by tactile evaluation using the finger with which the product was applied, and check whether circular motions can be performed during application.
[0074] Whether the skin is slippery is determined by a rating from 1 to 5 (based on an assessment scale where 1 indicates not smooth and 5 indicates very smooth). The assessment is conducted by a panel of at least 10 experts.
[0075] Between product tests, wash your fingers with a cloth dampened with warm water.
[0076] Physicochemical and chemical stability over 2 months with time and temperature (at ambient temperature or AT, i.e., 25°C and 45°C). Changes Table 1
[0077] as: active substance Table 2
[0078] Solution for measuring viscosity: The stability of the composition was tested after 2 months of storage at AT and after 2 months of storage at 45°C.
[0079] The viscosity of the composition was measured using a viscometer, such as the Rheomat RM 100 PLUS manufactured by Lamy Rheology (equipped with a thermostatic bath), according to method CID-012-02.
[0080] in conclusion The different carrageenan contents according to the present invention enable the acquisition of physicochemically and chemically stable transparent essence (i.e., less than 10% loss after ascorbic acid determination at 45°C for 2 months).
[0081] Formulations A and B (containing 0.5 wt% and 0.4 wt% carrageenan, respectively) conforming to the present invention have the same physicochemical and chemical stability as the comparative formulation CC1; on the other hand, the sensory evaluation of formulations A and B (i.e., in the presence of carrageenan) conforming to the present invention is improved.
[0082] B / Prepare the following other comparative formulations CC3-CC5 according to Example 1A: CC3 and CC4 contain 1% and 0.4% xanthan gum, respectively, and do not contain carrageenan, while CC5 contains 0.5% cationic guar gum (hydroxypropyl guar hydroxypropyltrimethylammonium chloride) and does not contain carrageenan.
[0083] Table 3
[0084] The transparency, viscosity, stickiness, and smoothness of CC3-CC5 were also measured according to the scheme of Example 1A.
[0085] The results show that: CC3 is opaque, indicating high viscosity and being very sticky; CC4 is transparent, but still exhibits high viscosity and is very sticky; and CC5 is transparent but still very sticky and exhibits low smoothness. Furthermore, dephasing / decantation occurs after 2 months at 45°C. Therefore, the formulation CC5 is unstable.
[0086] The comparative formulation CC2 described below contains 7% ascorbic acid and 0.5% carrageenan, but also contains fatty phases (phase C and phase D). opaque Turbidity > 1000 NTU: Table 4
[0087] Example 2: Compositions according to the present invention and comparative compositions Five formulations C to G according to the invention (based on the scheme of Example 1) are prepared below and compared with the comparative formulation CC1 of Example 1.
[0088] Table 5
[0089] as: active substance [Table 6]
[0090] Conclusion: Adding coconut oil-glucoside and / or polyglycerol-4-decanoate surfactants to different carrageenan contents according to the present invention results in the acquisition of physicochemically and chemically stable transparent essences (i.e., ascorbic acid loss of less than 10% after T2 months at 45°C).
[0091] Compared with CC1, all sensory evaluations of formulations C to G according to the present invention (i.e., in the presence of carrageenan and coconut oil-glucoside and / or polyglycerol-4-decanoate surfactants) are improved.
[0092] For formulations A and B (containing 0.5 wt% and 0.4 wt% carrageenan, respectively, but without surfactants), some of these assessments were also improved.
[0093] The underlined values in Table 5 indicate a greater reduction in stickiness or an increase in smoothness compared to formulation CC1 (containing PQ-67) or even formulation A according to the invention (i.e., containing 0.5% carrageenan but without surfactant).
[0094] The two values in italics in Table 5 indicate that the reduction in stickiness is comparable to that of formulation CC1 (containing PQ-67) and formulation A according to the present invention.
[0095] The three values in bold in Table 5 indicate a greater reduction in stickiness or an increase in smoothness compared to formulation CC1 (containing PQ-67) or even formulation B according to the present invention (i.e., containing 0.4% carrageenan but without surfactant).
[0096] Only the value of 29.4 in Table 5 indicates that the reduction in stickiness is comparable to that of formulation CC1 (with PQ-67) and formulation B according to the invention.
Claims
1. A cosmetic composition comprising: At least 30 wt% water relative to the total weight of the composition. At least 5 wt% ascorbic acid relative to the total weight of the composition. At least 0.05 wt% of at least one carrageenan relative to the total weight of the composition, and The composition contains essentially no fatty phase and essentially no gelling agents other than carrageenan. The composition has a pH between 5 and 7.
2. The composition according to claim 1, characterized in that, The composition is single-phase.
3. The composition according to claim 1 or 2, characterized in that, The composition has a fatty phase concentration of less than or equal to 3 wt%, preferably less than or equal to 2 wt%, and preferably less than or equal to 1 wt% relative to the total weight of the composition; preferably, the composition does not contain any fatty phase at all.
4. The composition according to any one of the preceding claims, characterized in that, The composition is substantially free of surfactant; preferably, the composition has a surfactant concentration between 0.01 wt% and 3 wt%, more preferably between 0.1 wt% and 2 wt%, relative to the total weight of the composition; the surfactant is preferably selected from nonionic surfactants, preferably selected from polyglycerol esters of C8-C12 fatty acids, acyl glucosides and mixtures thereof; preferably, the surfactant is selected from polyglycerol esters containing 4 glycerol and C1 fatty acid units, cocoside and mixtures thereof; preferably, the surfactant is selected from polyglycerol-4-decanoate, cocoside and mixtures thereof; preferably, the composition is completely free of surfactant.
5. The composition according to any one of the preceding claims, characterized in that, The composition contains 30 wt% to 93 wt%, more preferably 50 wt% to 90 wt%, and even more preferably 55 wt% to 75 wt% of water relative to the total weight of the composition.
6. The composition according to any one of the preceding claims, characterized in that, The aqueous phase comprises at least one organic solvent that is soluble in water at 25°C. Preferably, the organic solvent is selected from alcohols, polyols, and mixtures thereof. Preferably, the composition comprises 1 wt% to 25 wt%, more preferably 2 wt% to 30 wt%, and even more preferably 5 wt% to 20 wt% of a water-soluble organic solvent relative to the total weight of the composition.
7. The composition according to any one of the preceding claims, characterized in that, The composition contains at least 7 wt%, more preferably at least 10 wt%, of ascorbic acid relative to the total weight of the composition; preferably, the composition contains 5 wt% to 20 wt%, more preferably 7 wt% to 20 wt%, more preferably 10 wt% to 15 wt%, of ascorbic acid relative to the total weight of the composition.
8. The composition according to any one of the preceding claims, characterized in that, The composition comprises at least one carrageenan selected from κ-carrageenan, ι-carrageenan and λ-carrageenan.
9. The composition according to any one of the preceding claims, characterized in that, The composition contains at least one ι-carrageenan.
10. The composition according to any one of the preceding claims, characterized in that, The composition contains at least 0.1 wt%, preferably at least 0.2 wt%, of at least one carrageenan relative to the total weight of the composition; preferably, the composition contains 0.05 wt% to 2 wt%, preferably 0.1 wt% to 1 wt%, preferably 0.2 wt% to 0.8 wt%, of at least one carrageenan relative to the total weight of the composition.
11. The composition according to any one of the preceding claims, characterized in that, The composition has a pH between 5.5 and 6.
5.
12. The composition according to any one of the preceding claims, characterized in that, The composition contains at least one chelating agent, preferably a salt of ethylenediamine disuccinic acid.
13. The composition according to any one of the preceding claims, characterized in that, The composition is transparent; preferably, the composition has a turbidity value of less than 200 NTU, more preferably less than 150 NTU, more preferably less than 100 NTU, more preferably less than 50 NTU, more preferably less than 15 NTU, more preferably less than 13 NTU, more preferably less than 10 NTU, more preferably at least equal to 1 NTU; and preferably between 1 NTU and 15 NTU, more preferably between 1 NTU and 13 NTU.
14. The composition according to any one of the preceding claims, characterized in that, Relative to the total weight of the composition, the composition has a concentration of less than or equal to 1 wt%, preferably less than or equal to 0.5 wt%, preferably less than or equal to 0.3 wt%, preferably less than or equal to 0.2 wt%, and preferably less than or equal to 0.1 wt% of a gelling agent other than carrageenan; preferably, the composition does not contain any gelling agent other than carrageenan; preferably, the gelling agent other than carrageenan is selected from: natural gums, such as xanthan gum, guar gum, carob gum, cellulose gum; carbomer; cellulose derivatives, such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, or hydroxymethyl cellulose; alginate; and polymers and copolymers containing 2-acrylamido-methylpropanesulfonic acid monomer.
15. A cosmetic method for caring for keratin materials, preferably skin, comprising applying a composition according to any one of the preceding claims to the keratin material.