Transparent cosmetic composition with ascorbic acid and natural polymer

Abstract

Transparent cosmetic composition with ascorbic acid and natural polymer The present invention relates to a cosmetic composition comprising: - at least 30% by weight of water with respect to the total weight of the composition, - at least 5% by weight of ascorbic acid with respect to the total weight of the composition, - at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan, and - the composition being substantially free from fatty phase and substantially free from gelling agent other than carrageenan, said composition having a pH between 5 and 7. The invention also relates to a cosmetic process for the care of keratin materials, preferably the skin, comprising application of a composition according to the invention on said keratin materials.

Description

[0001] Transparent cosmetic composition with ascorbic acid and natural polymer

[0002] The present invention relates to a transparent aqueous cosmetic composition, comprising:

[0003] - at least 30% by weight of water with respect to the total weight of the composition,

[0004] - at least 5% by weight of ascorbic acid with respect to the total weight of the composition,

[0005] - at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan, and

[0006] - the composition being substantially free from fatty phase and substantially free from gelling agent other than carrageenan, said composition having a pH between 5 and 7.

[0007] In cosmetic applications, it is common to add ascorbic acid (vitamin C) as an active agent regenerating the skin thanks to stimulation of the synthesis of collagen which is responsible for the firmness of the skin, or as a depigmenting agent, because this vitamin reduces the production of melanin which is responsible for brown spots. Ascorbic acid is also known for its antioxidant properties.

[0008] However, when ascorbic acid is introduced in aqueous medium (such as emulsions or serums) at high concentrations (i.e. for example higher than 1 % by weight, preferably higher than 5% by weight), its formulation is difficult to make, because it destabilizes and substantially changes color. This color change may lead to a brown coloration, which is unacceptable for the consumer.

[0009] This is why serum or solution type aqueous compositions are found on the market, which comprise ascorbic acid in the form of powder to dissolve extemporaneously. The drawback of this product type is that the vitamin C ends up by degrading in the aqueous medium. Thus, these products lose their appeal because, for practical reasons, consumers prefer serums requiring no prior manipulation and guaranteeing color stability and no chemical degradation.

[0010] Moreover, the formulation of environmentally-friendly cosmetic products, i.e. those whose design and development take account of environmental issues, is becoming a major concern in helping to meet global challenges. It has therefore become essential to propose more sustainable compositions and / or preparation processes and / or ingredients to meet these environmental challenges. In this context, it is important to develop novel cosmetic compositions with a better carbon footprint, in particular by promoting the use of renewable raw materials and / or those with a good wilderness quality index and / or of natural origin, and more particularly those of plant origin, while reducing the use of compounds of petrochemical origin.

[0011] Hence, there is a need for an aqueous cosmetic composition comprising ascorbic acid which is stable, i.e. which keeps the same color as initially (white in general) and the same texture, and which does not degrade the active agent.

[0012] Surprisingly, the Applicant discovered that carrageenan type natural polymers, used at a concentration of at least 0.05% by weight with respect to the total weight of the composition, make it possible to obtain stable transparent compositions comprising at least 5% by weight of ascorbic acid and which have good sensory properties on application.

[0013] Thus, the present invention relates to a cosmetic composition comprising:

[0014] - at least 30% by weight of water with respect to the total weight of the composition,

[0015] - at least 5% by weight of ascorbic acid with respect to the total weight of the composition,

[0016] - at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan, and

[0017] - the composition being substantially free from fatty phase and substantially free from gelling agent other than carrageenan, said composition having a pH between 5 and 7.

[0018] The invention also relates to a cosmetic process for the care of keratin materials, preferably the skin, comprising application of a composition according to the invention on said keratin materials.

[0019] Preferably, the composition according to the invention is an aqueous solution, more preferably an aqueous solution with a slightly gelled aspect. Preferably, the composition according to the invention is a single-phase composition. This composition may be called "serum". The term "serum" denotes a composition with a fluid texture, with a slightly gelled appearance, flowing, and preferably concentrated with ascorbic acid (i.e. preferably at least 5% by weight of ascorbic acid).

[0020] Preferably, the composition according to the invention is substantially free from surfactant. "Substantially free from surfactant" means that the composition according to the invention has a surfactant concentration between 0.01% and 3% by weight, with respect to the total weight of the composition, preferably between 0.1 % and 2% by weight. Preferably, the surfactants may consist of peptizers, the concentration of which is between 0.01 and 3% by weight; they make it possible to solubilize a small amount of oil(s) or lipophilic compound(s) or perfume(s) (i.e. concentration of perfume(s) or oil(s) or lipophilic compound(s) between 0.01% and 2%). The surfactant is preferably chosen from among non-ionic surfactants. Preferably, the surfactant is chosen from among polyglycerol esters of C8-C12 fatty acids, acylglucosides and mixtures thereof; preferably, it is chosen from among polyglycerol esters comprising 4 glycerol and C1 fatty acid units, cocoglucoside and mixtures thereof; preferably, it is chosen from among polyglycerol-4 caprate, cocoglucoside and mixtures thereof.

[0021] Preferably, according to an alternative, the composition according to the invention is totally free from surfactants.

[0022] The composition according to the invention is substantially free from fatty phase. "Substantially free from fatty phase" means that the composition according to the invention has a fatty phase concentration less than or equal to 3% by weight, with respect to the total weight of the composition, preferably less than or equal to 2% by weight, preferably less than or equal to 1% by weight. Preferably, the composition according to the invention is totally free from fatty phase.

[0023] The composition according to the invention is substantially free from gelling agent other than carrageenan. "Substantially free from gelling agent other than carrageenan" means that the composition according to the invention has a concentration of gelling agent other than carrageenan less than or equal to 1% by weight, with respect to the total weight of the composition, preferably less than or equal to 0.5% by weight, preferably less than or equal to 0.3% by weight, preferably less than or equal to 0.2% by weight, preferably less than or equal to 0.1 % by weight. Preferably, the composition according to the invention is totally free from gelling agent other than carrageenan. The gelling agent other than carrageenan is in particular chosen from among natural gums such as xanthan gum, guar gum, guar gum, cellulose gum; carbomers; cellulose derivatives such as hydroxyethylcellulose, hydroxypropylmethylcellulose, hydroxypropylcellulose or hydroxymethylcellulose; alginates; and polymers and copolymers comprising a monomer of 2-acrylamido- methylpropanesulfonic acid (AMPS). The composition according to the invention comprises water, which forms the aqueous phase.

[0024] The water used can be sterile demineralized water and / or floral water such as rose water, cornflower water, chamomile water or linden water, and / or a spring or natural mineral water.

[0025] The composition comprises at least 30% by weight of water with respect to the total weight of the composition, preferably at least 40% by weight, preferably at least 50% by weight. Preferably, the composition comprises from 30% to 93% by weight of water with respect to the total weight of the composition, more preferably from 50% to 90%, even more preferably from 55% to 75%.

[0026] The aqueous phase may also comprise at least one organic solvent soluble in water, at 25°C.

[0027] Preferably, the water-soluble organic solvent is chosen from among alcohols, polyols and mixtures thereof.

[0028] Among the alcohols, mention may be made of C1-C10, more preferably C1-C5, alcohols, such as ethanol, isopropanol, propanol and butanol.

[0029] The polyol is, preferably, chosen from among polyols having from 2 to 20 carbon atoms, preferably from 2 to 6 carbon atoms, such as glycerol, diglycerol, propyleneglycol, isoprene glycol, dipropyleneglycol, butylene glycol, hexylene glycol, 1 ,3-propanediol, pentylene glycol, polyethyleneglycols having from 2 to 200 ethylene oxide units and mixtures thereof.

[0030] Preferably, the water-soluble organic solvent is chosen from among polyols, preferably glycerol and / or hexylene glycol and / or pentylene glycol.

[0031] Preferably, the composition comprises from 1% to 25% by weight of water-soluble organic solvent, with respect to the total weight of the composition, more preferably from 2% to 30% by weight, even more preferably from 5 to 20% by weight.

[0032] Ascorbic acid

[0033] Preferably, the ascorbic acid for the purposes of the invention corresponds to L-ascorbic acid, or vitamin C. It has a structure according to the formula (I):

[0034] [Chem 1]

[0035] The composition comprises at least 5% by weight of ascorbic acid with respect to the total weight of the composition, more preferably at least 7% by weight, more preferably at least 10% by weight.

[0036] Preferably, the composition comprises from 5% to 20% by weight of ascorbic acid, with respect to the total weight of the composition, more preferably from 7% to 20% by weight, more preferably from 10% to 15% by weight.

[0037] The composition according to the invention comprises at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan.

[0038] Carrageenans are anionic polysaccharides making up the cell walls of various red algae (Rhodophyceae) belonging to the Gigartinaceae, Hypneaceae, Furcellariaceae and Polyideaceae families. They are generally obtained by hot aqueous extraction from natural strains of said algae. These linear polymers, formed by disaccharide structural units, are composed of two D-galactopyranose units bonded alternately by a(1 ,3) and (3(1 ,4) bonds. They are highly sulfated polysaccharides (20-50%) and the a-D-galactopyranosyl residues can be in 3,6-anhydro form. According to the number and position of ester-sulfate groups on the molecule repeating disaccharide, a distinction is made between several types of carrageenans, namely: kappa-carrageenans which have one ester-sulfate group, iota- carrageenans which have two ester-sulfate groups and lambda-carrageenans which have three ester-sulfate groups.

[0039] Carrageenans are essentially composed of salts of potassium, sodium, magnesium, triethanolamine and / or calcium and polysaccharide sulfate esters.

[0040] Preferably, the composition according to the invention comprises at least one iota- carrageenan.

[0041] The carrageenans are in particular marketed by Seppic under the name Solagum, by Gelymar under the trade name Carragel, Carralact, and Carrasol, by Cargill under the trade names SATIAGEL™ and SATIAGUM™, and by CP-Kelco under the trade name GENULACTA, GENUGEL and GENUVISCO.

[0042] Preferably, the composition according to the invention comprises at least one iota- carrageenan notably commercialized under the name Satiagel VPC 508 by Cargill.

[0043] The composition according to the invention comprises at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan, preferably at least 0.1% by weight, preferably at least 0.2% by weight.

[0044] Preferably, the composition according to the invention comprises from 0.05% to 2% by weight with respect to the total weight of the composition of at least one carrageenan, preferably from 0.1% to 1 % by weight, preferably from 0.2% to 0.8% by weight. pH of the composition

[0045] The composition according to the invention has a pH of 5.0 to 7.0. Advantageously, the pH of the composition is between 5.5 and 6.5.

[0046] Such a pH effectively limits the color degradation of ascorbic acid, and thus limits the change from a colorless composition into a composition which becomes yellow to brown over time.

[0047] Preferably, the cosmetic composition according to the invention comprises at least one base.

[0048] The base is particularly used to increase the final pH of the composition to between 5.0 and 7.0, preferably between 5.5 and 6.5.

[0049] The base may be selected from among mineral bases like for example hydroxides of alkaline metals, sodium hydroxide or potassium hydroxide.

[0050] Preferably, the base of the composition is an alkaline metal hydroxide, preferably sodium hydroxide or potassium hydroxide, preferably sodium hydroxide. Indeed, these bases are more advantageous than nitrogenous bases, such as triethanolamine, on color stabilization (i.e., less yellowing).

[0051] Preferably, the base of the composition according to the invention is present in a base:ascorbic acid ratio ranging from 0.22 to 0.30. The composition may also comprise one or more additive(s) conventionally used in cosmetic compositions such as for example active ingredients, sequestrants, preservatives or perfumes.

[0052] Preferably, among the active agents that can be used, anti-aging agents, in particular such as adenosine, salicylic acid, glycolic acid, niacinamide (Vitamin B3) and / or tocopherol, or else perfumes, are preferred.

[0053] The composition according to the invention may comprise at least one sequestrant.

[0054] Among the preferred sequestrants, mention may be made of the salts of ethylenediamine disuccinic acid.

[0055] The ethylenediamine disuccinic acid is a compound of formula (II):

[0056] [Chem 3]

[0057] Preferably, the composition according to the invention comprises from 0.01% to 2.5% by weight, preferably from 0.05% to 1.5% by weight, more preferably from 0.07% to 0.3% by weight of sequestrant with respect to the total weight of the composition.

[0058] The composition according to the invention may comprise at least one preservative.

[0059] Among the preferred preservatives, mention may be made of hydroxyacetophenone, phenoxyethanol and mixtures thereof.

[0060] Preferably, the composition according to the invention comprises from 0.1% to 2% by weight, preferably from 0.3% to 1 .5% by weight, more preferably from 0.5% to 1 % by weight of preservative(s) with respect to the total weight of the composition.

[0061] Preferably, the composition according to this invention is transparent.

[0062] The term transparent composition as used in the context of this invention means a composition having a turbidity value of less than 200 NTU, preferably less than 150 NTU, preferably less than 100 NTU, preferably less than 50 NTU, preferably less than 15 NTU, preferably less than 13 NTU, preferably less than 10 NTU. Preferably, the turbidity of the compositions is equal to at least 1 NTU. NTUs (nephelometric turbidity units) are units for measurement of the turbidity of a composition. The turbidity measurement is made, for example, with a model 2100P turbidity meter from Hach Company, the tubes used for the measurement being referenced AR397A cat 24347-06. The measurements are made at ambient temperature (from 20°C to 25°C).

[0063] Preferably, the composition is transparent and has a turbidity value of between 1 and 15 NTU, preferably between 1 and 13 NTU.

[0064] Finally, the invention also relates to a cosmetic process for the care of keratin materials, preferably the skin, comprising the application of a composition according to the invention on said keratin materials.

[0065] Concrete, yet non-limiting, examples, illustrating the invention, will now be provided.

[0066] EXAMPLES

[0067] In the examples, the pressure is atmospheric pressure, unless stated otherwise. Unless specified otherwise, the percentages are expressed by weight with respect to the total weight of the composition (% w / w).

[0068] Example 1 : Compositions according to the invention and comparative compositions

[0069] A / Formulas A and B according to the invention hereinbelow, and Comparative Formula CC1 , are prepared according to the following protocol:

[0070] In a first beaker (phase A):

[0071] 1. Introduce water (T>60°C) and add the ingredients of phase A thereto: glycerin, caprylyl glycol, preservative(s), sequestrant, pentylene glycol, sodium hyaluronate and active agent at 60° C;

[0072] 2. Once the whole has dissolved and there are no more crystals, allow to cool.

[0073] In a second beaker (phase B):

[0074] 1. Introduce water at ambient temperature and add ascorbic acid thereto;

[0075] 2. Adjust the pH to 6 with sodium hydroxide;

[0076] 3. Add carrageenan or polyquaternium-67 with moderate and lengthy stirring to ensure an effective deployment of the polymer.

[0077] Mix the two beakers and make up to QS with water if required. The assessment is performed thanks to a physical turbidity measurement thanks to a turbidimeter. A formula is considered transparent if the turbidity value is less than 15 NTU. assessment is performed thanks to an in vitro test on synthetic skin (SkinFX), on a scale of 1 to 5 by laboratory panel of 10 people. The sticky and gliding effect result of the serum is compared.

[0078] For the sticky effect, 1 being not sticky and 5 very sticky.

[0079] For the gliding effect, 1 being no gliding and 5 high gliding, considering that naked skin is rated as 3.

[0080] - Assessment of the sticky effect of the formulas during application: assessment at 45 seconds and 2 minutes 45 seconds after application:

[0081] The reduction in the sticky effect of the fresh formulas at application is measured: assessment 45 sec after application of the sticky effect by a panel of 10 experts trained to replicate a standardized assessment action comprising the limit formulas (assessment scale from 1 to 5, 1 meaning not sticky and 5 very sticky).

[0082] The protocol for assessing the sticky effect is as follows: 50pl of the product is applied on the back of one hand covered with a membrane that mimics the characteristics of the skin. With three fingers of the other hand (index finger, middle finger and ring finger), spread in a circle 15 times for 15 seconds. Then wait for 15 seconds, spread in a circle 15 more times for 15 seconds.

[0083] The assessment of the sticky effect is performed at the end of the 45 seconds with the fingers used for application, by tactile assessment, by tapping twice.

[0084] The skin adheres, or not, according to a score between 1 and 5 (according to the assessment scale from 1 to 5, 1 meaning not sticky and 5 very sticky). The assessments are carried out by a panel of at least 10 experts.

[0085] Rinse the fingers between each product with a cloth moistened with warm water.

[0086] - Assessment of the gliding effect of the formulas during application: assessment at 45 seconds and 2 minutes 45 seconds after application:

[0087] The increase in the gliding effect of the fresh formulas at application is measured: assessment 45 sec after application of the gliding effect by a panel of 10 experts trained to replicate a standardized assessment action comprising the limit formulas (assessment scale from 1 to 5, 1 meaning no gliding and 5 high gliding). The protocol for assessing the gliding effect is as follows: 50pl of the product is applied on the back of one hand covered with a membrane that mimics the characteristics of the skin. With three fingers of the other hand (index finger, middle finger and ring finger), spread in a circle 15 times for 15 seconds. Then wait for 15 seconds, spread in a circle 15 more times for 15 seconds.

[0088] The gliding effect is assessed after the 45 seconds with the fingers used for application, by tactile assessment, it is checked whether it is possible to make circular movements during application.

[0089] The skin grips, or not, according to a score between 1 and 5 (according to the assessment scale from 1 to 5, 1 meaning no gliding and 5 high gliding). The assessments are carried out by a panel of at least 10 experts.

[0090] Rinse the fingers between each product with a cloth moistened with warm water.

[0091] Physicochemical and chemical stability over time and temperature (at ambient temperature or A, i.e. 25°C, and at 45°C) at 2 months

[0092] [Table 1] a.s.: active substance [Table 2]

[0093] Protocol for measuring viscosity: The compositions are tested for their stability after 2 months at AT and after 2 months of storage at 45°C.

[0094] The viscosity of the composition is measured using a viscometer, for example Rheomat RM 100 PLUS manufactured by Lamy Rheology (equipped with a thermostatic bath), according to method CID-012-02.

[0095] Conclusion: the different carrageenan contents according to the invention make it possible to obtain a physicochemically and chemically stable transparent serum (i.e. loss less than 10% after ascorbic acid assay at T2 months at 45°C). The physicochemical and chemical stabilities are identical between formulas A and B according to the invention (with 0.5% and 0.4% by weight of carrageenan) and comparative formula CC1 ; on the other hand, the sensory assessment are improved for formulas A and B according to the invention (i.e. in the presence of carrageenan).

[0096] B / The following other comparative formulas CC3-CC5 were also prepared as in example 1A :

[0097] CC3 and CC4 respectively comprise 1 % or 0.4% of xanthan gum and no carraghenan, and CC5 comprises 0.5% of a cationic guar (Hydroxypropyl Guar Hydroxypropyltrimonium Chloride) and no carraghenan.

[0098] [Table 3]

[0099] Transparency, viscosity and sticky and gliding effects for CC3-CC5 were also measured according to the protocols of example 1A.

[0100] The results show that :

[0101] CC3 is not transparent, shows a high viscosity and is very sticky ;

[0102] CC4 is transparent but still shows a high viscosity and is very sticky ; and

[0103] CC5 is transparent but is still very sticky and shows a low gliding effect. Moreover, after 2 months at 45°C, dephasing / decantation occurs. Thus, formula CC5 is not stable. C / Comparative formula CC2 hereinafter, which contains 7% ascorbic acid and 0.5% carrageenan, but also a fatty phase (phases C and D), is opaque: turbidity > 1000 NTU:

[0104] [Table 4]

[0105] Example 2: Compositions according to the invention and comparative compositions

[0106] The 5 Formulas C to G according to the invention are prepared hereinafter (according to the protocol of example 1), and they are compared to Comparative Formula CC1 of example 1.

[0107] [Table 5]

[0108] a.s.: active substance

[0109] [Table 6]

[0110] Conclusion: adding coco-glucoside and / or polyglyceryl-4 caprate surfactants to the different carrageenan contents according to the invention makes it possible to obtain a physicochemically and chemically stable transparent serum (i.e. loss less than 10% after ascorbic acid assay at T2 months at 45°C).

[0111] All the sensory assessments are improved for formulas C to G according to the invention (i.e. in the presence of carrageenan and coco-glucoside and / or polyglyceryl-4 caprate surfactants) in comparison with CC1.

[0112] Some of these assessments are also improved with respect to formulas A and B (with 0.5% and 0.4% by weight of carrageenan but without surfactant).

[0113] The underlined values in Table 5 show a greater reduction in the sticky effect or increase in the gliding effect than formula CC1 (with PQ-67) and even than formula A according to the invention (i.e. with 0.5% carrageenan and without surfactant).

[0114] Both values in italics in Table 5 show an equivalent reduction of the sticky effect to that of formula CC1 (with PQ-67) and also to formula A according to the invention.

[0115] The three values in bold type in Table 5 show a greater reduction in the sticky effect or increase in the gliding effect than formula CC1 (with PQ-67) and even than formula B according to the invention (i.e. with 0.4% carrageenan and without surfactant).

[0116] Only the value of 29.4 in Table 5 shows an equivalent reduction in the sticky effect to formula CC1 (with PQ-67) and also to formula B according to the invention.

Claims

CLAIMS1. Cosmetic composition comprising:- at least 30% by weight of water with respect to the total weight of the composition,- at least 5% by weight of ascorbic acid with respect to the total weight of the composition,- at least 0.05% by weight with respect to the total weight of the composition of at least one carrageenan, and- the composition being substantially free from fatty phase and substantially free from gelling agent other than carrageenan, said composition having a pH between 5 and 7.

2. Composition according to claim 1 , characterized in that it is single-phase.

3. Composition according to claim 1 or 2, characterized in that it has a fatty phase concentration less than or equal to 3% by weight, with respect to the total weight of the composition, preferably less than or equal to 2% by weight, preferably less than or equal to 1% by weight, preferably it is totally free from fatty phase.

4. Composition according to one of the preceding claims, characterized in that it is substantially free from surfactant; preferably, it has a surfactant concentration between 0.01 % and 3% by weight, with respect to the total weight of the composition, preferably between 0.1 % and 2% by weight; the surfactant is preferably chosen from among non-ionic surfactants, preferably from among polyglycerol esters of C8-C12 fatty acids, acylglucosides and mixtures thereof; preferably from among polyglycerol esters comprising 4 glycerol and C1 fatty acid units, cocoglucoside and mixtures thereof; preferably from among polyglycerol-4 caprate, cocoglucoside and mixtures thereof; preferably, the composition is totally free from surfactants.

5. Composition according to one of the preceding claims, characterized in that it comprises from 30% to 93% by weight of water with respect to the total weight of the composition, more preferably from 50% to 90%, even more preferably from 55% to 75%.

6. Composition according to one of the preceding claims, characterized int hat the aqueous phase comprises at least one organic solvent soluble in water, at 25°C, preferably chosen from among alcohols, polyols and mixtures thereof; preferably, thecomposition comprises from 1% to 25% by weight of water-soluble organic solvent, with respect to the total weight of the composition, more preferably from 2% to 30% by weight, even more preferably from 5 to 20% by weight.

7. Composition according to one of the preceding claims, characterized in that it comprises at least 7% by weight of ascorbic acid with respect to the total weight of the composition, more preferably at least 10% by weight; preferably, it comprises from 5% to 20% by weight of ascorbic acid, with respect to the total weight of the composition, more preferably from 7% to 20% by weight, more preferably from 10% to 15% by weight.

8. Composition according to one of the preceding claims, characterized in that it comprises at least one carrageenan chosen from among kappa-carrageenans, iota- carrageenans and lambda-carrageenans.

9. Composition according to one of the preceding claims, characterized in that it comprises at least one iota-carrageenan.

10. Composition according to one of the preceding claims, characterized in that it comprises at least 0.1 % by weight with respect to the total weight of the composition of at least one carrageenan, preferably at least 0.2% by weight; preferably the composition comprises from 0.05% to 2% by weight with respect to the total weight of the composition of at least one carrageenan, preferably from 0.1 % to 1% by weight, preferably from 0.2% to 0.8% by weight.

11. The composition according to one of the preceding claims, characterized in that it has a pH between 5.5 and 6.5.

12. Composition according to one of the preceding claims, characterized in that it comprises at least one sequestrant, preferably chosen from among the salts of ethylenediamine disuccinic acid.

13. Composition according to one of the preceding claims, characterized in that it is transparent; preferably, it has a turbidity value of less than 200 NTU, preferably less than 150 NTU, preferably less than 100 NTU, preferably less than 50 NTU, preferably less than 15 NTU, preferably less than 13 NTU, preferably less than 10 NTU, preferably atleast equal to 1 NTU; and preferably between 1 and 15 NTU, preferably between 1 and 13 NTU.

14. Composition according to one of the preceding claims, characterized in that it has a concentration of gelling agent other than carrageenan less than or equal to 1% by weight, with respect to the total weight of the composition, preferably less than or equal to 0.5% by weight, preferably less than or equal to 0.3% by weight, preferably less than or equal to 0.2% by weight, preferably less than or equal to 0.1 % by weight; preferably the composition is totally free from gelling agent other than carrageenan; preferably the gelling agent other than carrageenan is chosen from among natural gums such as xanthan gum, guar gum, carob gum, cellulose gum; carbomers; cellulose derivatives such as hydroxyethylcellulose, hydroxypropylmethylcellulose, hydroxypropylcellulose or hydroxymethylcellulose; alginates; and polymers and copolymers comprising a monomer of 2-acrylamido-methylpropanesulfonic acid.

15. Cosmetic process for the care of keratin materials, preferably the skin, comprising application of a composition according to one of the preceding claims on said keratin materials.

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