JP7226932B2 - Stable acidic composition - Google Patents

Description

The present invention relates to compositions that are acidic, stable and suitable for cosmetic purposes.

For cosmetic purposes, it is known to introduce cosmetic active ingredients into compositions. For the stability of such compositions, eg uniform appearance over time, preferably at least one thickening agent may be added to the composition.

Some cosmetic active ingredients, such as vitamin C, tend to lose activity under neutral or alkaline conditions. Therefore, it is preferred that the composition containing the active cosmetic ingredient is kept under acidic conditions in order to maintain the activity of the active cosmetic ingredient.

However, in acidic conditions many conventional thickeners tend to lose their thickening properties. As such, compositions containing such thickening agents may become unstable in acidic conditions, resulting in, for example, phase separation of the composition.

EP-A-570230

The Japanese Pharmacopoeia, 13th Edition, chapter on hydroxypropyl methyl cellulose 2208 Walter Noll, "Chemistry and Technology of Silicones" (1968), Academic Press Cosmetics and Toiletries, Vol. 91, Jan. 76, pp. 27-32, Todd & Byers, Volatile Silicone Fluids for Cosmetics ASTM Standard 445 Appendix C

It is an object of the present invention to provide a composition that can suitably contain cosmetically active ingredients that are stable under acidic conditions and have low activity under neutral or alkaline conditions.

The purpose of the above is
(a) at least one hydrophobically modified alkylcellulose;
(b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit;
(c) at least one alkyl phosphate;
(d) a composition comprising water,
This can be achieved by compositions having a pH of less than 7.0, preferably less than 6.0, more preferably less than 5.0, even more preferably less than 4.0.

(a) Hydrophobic modified alkyl cellulose has the following formula (1):

[In the formula,
R ¹ , R ² and R ³ are the same or different and are hydrogen atoms, lower alkyl groups, —[CH ₂ CH _2-k (CH ₃ ) _k O] _m H groups, or —CH ₂ CH(OH) a CH ₂ OC _j H _2j+1 group,
n is an integer from 100 to 10,000;
k is an integer of 0 or 1;
m is an integer from 1 to 10;
j is an integer from 6 to 26, preferably from 12 to 24, more preferably from 14 to 22, even more preferably from 16 to 20;
provided that the hydrophobically modified alkylcellulose contains at least one _-CH2CH (OH) _{CH2OCjH2j +1} group per _molecule ]
can be expressed as

The (a) hydrophobically modified alkyl cellulose represented by the _above formula (1) has _-CH2CH (OH) _{CH2OCjH2j +1} groups of 0.1 relative to the total mass of the hydrophobically modified alkylcellulose. It may be included in an amount of ~10.0% by mass.

The (a) hydrophobically modified alkylcellulose represented by the above formula (1) contains 10.0 to 50.0% by mass of a lower alkyl group and 3.0 to 20.0% by mass of -[ _{CH2CH2 -k} ( _{CH3 ) kO} ] _mH groups and 0.1 to 10.0% by weight of _-CH2CH (OH) _{CH2OCjH2j +1} groups.

The amount of (a) hydrophobically modified alkylcellulose in the composition according to the present invention is 0.01% to 10% by weight, preferably 0.05% to 5% by weight, more preferably 0.1% by weight, relative to the total weight of the composition. It may be from mass % to 1 mass %.

(b) Amphiphilic polymers may be made from C _10-30 alkyl (meth)acrylates and at least one of acrylic acid, methacrylic acid, and their esters.

(b) The amphiphilic polymer may be crosslinked.

(b) amphiphilic polymers are acrylates/C _10-30 alkyl acrylate crosspolymer, acrylates/ethylhexyl acrylate crosspolymer, C _8-22 alkyl acrylate/methacrylic acid crosspolymer, potassium acrylate/C _10-30 alkyl acrylate It may be selected from the group consisting of crosspolymers, sodium acrylate/C _10-30 alkyl acrylate crosspolymers, and mixtures thereof.

The amount of (b) amphiphilic polymer in the composition according to the invention is between 0.01% and 10% by weight, preferably between 0.05% and 5% by weight, more preferably 0.1% by weight relative to the total weight of the composition. % to 1% by mass.

(c) Alkyl phosphate may be a C _10-30 alkyl phosphate and is preferably selected from the group consisting of cetyl phosphate, stearyl phosphate, cetearyl phosphate, and mixtures thereof.

The amount of (c) alkyl phosphate in the composition according to the invention is from 0.01% to 10%, preferably from 0.05% to 5%, more preferably from 0.1% to 10% by weight, relative to the total weight of the composition. It may be 1% by mass.

The amount of (d) water in the composition according to the invention is 30% to 90%, preferably 40% to 80%, more preferably 50% to 70% by weight, relative to the total weight of the composition. % by mass.

The composition according to the invention may further comprise (e) at least one oil.

The composition according to the invention may further comprise (f) at least one cosmetically active ingredient selected from the group consisting of vitamin C and its derivatives, salicylic acid and its derivatives, alpha-hydroxy acids, and mixtures thereof.

The invention also relates to a cosmetic method comprising applying a composition according to the invention onto a keratin material.

As a result of intensive studies, the inventors found that it is possible to provide a composition that can suitably contain cosmetic active ingredients that are stable under acidic conditions and have low activity under neutral or alkaline conditions. discovered.

Therefore, the composition according to the invention is
(a) at least one hydrophobically modified alkylcellulose;
(b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit;
(c) at least one alkyl phosphate;
(d) including water;
The pH of the composition is below 7.0, preferably below 6.0, more preferably below 5.0, even more preferably below 4.0.

The compositions according to the invention are stable so that the uniform appearance of the composition can be maintained over an extended period of time. Phase separation will therefore not occur in the composition according to the invention over a long period of time.

Compositions according to the invention may suitably contain cosmetically active ingredients that are less active in neutral or alkaline conditions. The cosmetically active ingredient in the composition according to the invention can exercise its activity since it does not, for example, cause degradation or the like.

If the composition according to the invention comprises at least one oil, the oil may be in the form of an emulsion that is stable under acidic conditions.

Compositions according to the invention may be acidic and highly microbial resistant. The compositions according to the invention may therefore have good storage properties.

The compositions according to the invention can also provide good texture.

The present invention will be described in detail below.

[Composition]
The composition according to the invention is
(a) at least one hydrophobically modified alkylcellulose;
(b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit;
(c) at least one alkyl phosphate;
(d) including water;
The pH of the composition is below 7.0, preferably below 6.0, more preferably below 5.0, even more preferably below 4.0.

(hydrophobic modified alkyl cellulose)
The composition according to the invention comprises (a) at least one hydrophobically modified alkylcellulose. A single type of hydrophobically modified alkylcellulose or two or more different types of hydrophobically modified alkylcellulose can be used in combination.

The (a) hydrophobically modified alkylcellulose used for the present invention can be obtained by introducing one or more long-chain alkyl groups, which are hydrophobic groups, into a cellulose ether derivative.

(a) Hydrophobic modified alkyl cellulose has the following formula (1):

[In the formula,
R ¹ , R ² and R ³ are the same or different and are hydrogen atoms, lower alkyl groups, —[CH ₂ CH _2-k (CH ₃ ) _k O] _m H groups, or —CH ₂ CH(OH) a CH ₂ OC _j H _2j+1 group,
n is an integer from 100 to 10,000;
k is an integer of 0 or 1;
m is an integer from 1 to 10;
j is an integer from 6 to 26, preferably from 12 to 24, more preferably from 14 to 22, even more preferably from 16 to 20;
provided that the hydrophobically modified alkylcellulose contains at least one _CH2CH (OH) _{CH2OCjH2j +1} group per _molecule ]
can be expressed as

At least one of ^R1 , ^R2 and ^R3 in formula (1) above is _{a -CH2CH} (OH) _{CH2OCjH2j +1} group, where j is an integer as defined above. ) is preferred.

(a) Among the cellulose ether derivatives that are the base of the hydrophobically modified alkylcellulose, hydroxypropylmethylcellulose is preferably selected. Hydroxypropylmethyl cellulose (HPMC) has the formula (1) above (wherein R ¹ , R ² and R ³ are the same or different and are a hydrogen atom (-H), a methyl group (-CH ₃ ) or - [CH ₂ CH(CH ₃ )O] _m H group), and HPMC contains at least one —[CH ₂ CH(CH ₃ )O] _m H group, where m is one molecule , which is an integer from 1 to 10). at least one of ^R1 , ^R2 and ^R3 in formula (1) above is a -[ _CH2CH ( _CH3 )O] _mH group, where m is an integer as defined above; Preferably.

Therefore, preferably, (a) the hydrophobically modified alkylcellulose can be obtained by introducing at least one long-chain alkyl group into HPMC. For example, (a) hydrophobically modified alkyl cellulose can be obtained by treating HPMC with the following formula in the presence of an alkaline catalyst:

It can be produced by reacting with stearyl glycidyl ether represented by

Cetyl glycidyl ether or decyl glycidyl ether can be used in addition to or instead of stearyl glycidyl ether.

(a) C _{j H} 2j+1 in -CH ₂ CH(OH)CH ₂ OC j H _{2j +1} group, which is a hydrophobic group introduced into hydrophobically modified alkyl cellulose, is a stearyl group (-C ₁₈ H ₃₇ ) is preferred, since the in-use feel of the composition according to the invention may be further improved. As _a result, _{the -CH2CH} (OH) _{CH2OCjH2j +1 group} is preferably the _-CH2CH (OH) _CH2OC18H37 group.

The (a) hydrophobically modified alkyl cellulose represented by the above formula (1) has -CH ₂ CH(OH)CH ₂ OC _j H _2j+1 groups with respect to the total mass of the hydrophobically modified alkyl cellulose, It is preferably contained in a content of 0.1 to 10.0% by mass, more preferably 0.1 to 2.0% by mass, still more preferably 0.1 to 1.0% by mass. When the content of _{CjH2j +1} in the _-CH2CH (OH _{) CH2OCjH2j +1} group is greater than 10.0% by mass in (a) the hydrophobically modified alkylcellulose, its solubility in water may be low and dissolved solutions may tend to become cloudy. Therefore, compositions according to the invention tend not to obtain sufficient viscosity.

The lower alkyl group in (a) the hydrophobically modified alkylcellulose represented by formula (1) above is preferably a methyl group or an ethyl group, more preferably a methyl group.

Since the (a) hydrophobically modified alkylcellulose represented by formula (1) above can have good solubility in water, the content of methyl groups in (a) the hydrophobically modified alkylcellulose is , preferably 10.0 to 50.0% by mass, more preferably 21.5 to 30.0% by mass.

The -[ _{CH2CH2 -k} (CH3) _kO ] _mH group in (a) the hydrophobically modified alkyl cellulose represented by the above formula ( ₁ ) is -[ _{CH2CH 2} O]mH group, and when k is 1, it is -[ _CH2CH ( _CH3 )O] _mH . The -[ _CH2CH ( _CH3 )O]mH group in which k is 1 is especially preferred.

From the viewpoint of solubility in water, the (a) hydrophobically modified alkyl cellulose represented by the above formula (1) has a -[CH ₂ CH(CH ₃ )O] _m H group combined with (a) a hydrophobically modified alkyl It is preferably contained in an amount of 3.0 to 20.0 mass %, more preferably 7.0 to 11.0 mass % in cellulose.

(a) lower alkyl groups, -[ _{CH2CH2 -k} ( _CH3 ) _kO ] _mH groups and _-CH2CH (OH) _{CH2OCjH2j +1} groups in hydrophobically modified _alkyl cellulose; The content of can be determined by the method according to chapter 2208 of The Japanese Pharmacopoeia, 13th edition, hydroxypropyl methyl cellulose.

(a) One example of a hydrophobically modified alkylcellulose is SANGELOSE, preferably available from Daido Chemical Co., Ltd. (a) Hydrophobic modified alkylcellulose is more preferably hydroxypropylmethylcellulose stearoxyether marketed by Daido Chemicals as SANGELOSE 60L, 60M, 90L or 90M.

(a) Hydrophobic modified alkyl cellulose can function as a thickening agent.

The amount of (a) hydrophobically modified alkylcellulose in the composition according to the present invention is 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the composition. good too.

On the other hand, the amount of (a) hydrophobically modified alkylcellulose in the composition according to the present invention is 10% by weight or less, preferably 5% by weight or less, more preferably 1% by weight, relative to the total weight of the composition. It may be below.

The amount of (a) hydrophobically modified alkylcellulose in the composition according to the present invention is 0.01% to 10% by weight, preferably 0.05% to 5% by weight, more preferably 0.1% by weight, relative to the total weight of the composition. It may be from mass % to 1 mass %.

(amphiphilic polymer)
The composition according to the invention comprises (b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit. A single type of such polymer can be used, or two or more different types of such polymers can be used in combination.

(b) The hydrophilic units of the amphiphilic polymer may have at least one carboxylic acid which may be in salt form. Hydrophilic units may be derived from (meth)acrylic acid or salts thereof.

(b) The hydrophobic unit of the amphiphilic polymer may have a fatty chain containing 10-30 carbon atoms, preferably 12-26 carbon atoms, more preferably 12-22 carbon atoms. Hydrophobic units may be derived from C _10-30 alkyl esters of (meth)acrylic acid. It is preferred that the fatty chains are present in pendant groups or in side chains of the (b) amphiphilic polymer.

(b) an amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit, wherein it is soluble in water or in alcohols specifically selected from lower alcohols, glycols, polyols; It is preferably hydrophilic, as it is or is dispersible.

For the purposes of this patent application, the term "hydrophilic" polymer is capable of forming hydrogen bonds with water or specifically with alcohols selected from lower alcohols, glycols and polyols (Co ) polymer. Specifically, it is preferred that (b) the amphiphilic polymer is capable of forming O-H bonds and/or N-H bonds and/or S-H bonds.

(b) Amphiphilic polymers can be obtained by polymerizing monomers consisting essentially of acrylic acid, methacrylic acid, and salts or esters thereof. As such, (b) amphiphilic polymers may be referred to as (meth)acrylic/acrylate polymers.

(b) If the amphiphilic polymer is not crosslinked, it is preferably not made or obtained by using any monomer other than acrylic acid, methacrylic acid, and salts or esters thereof.

Salts of (meth)acrylic acid may be in the form of inorganic salts such as alkali metal salts, alkaline earth metal salts or ammonium salts.

Esters of (meth)acrylic acid can be selected from alkyl (meth)acrylates and hydroxyalkyl (meth)acrylates.

In one embodiment, the esters of (meth)acrylic acid are C _1-4 alkyl (meth)acrylates, C _10-30 alkyl (meth)acrylates, hydroxyl C _1-4 alkyl (meth)acrylates and hydroxyl C _10-30 It can be selected from alkyl (meth)acrylates.

The C _1-4 alkyl ester of (meth)acrylic acid may be selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, and mixtures thereof. can.

Hydroxyl C _1-4 alkyl esters of (meth)acrylic acid are the group consisting of hydroxymethyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and mixtures thereof You can choose from

The C _10-30 alkyl (meth)acrylate may be a C _12-26 alkyl (meth)acrylate, preferably a C _12-22 alkyl (meth)acrylate.

Examples of (C ₁₀ -C ₃₀ )(meth)acrylates include lauryl acrylate, stearyl acrylate, decyl acrylate, isodecyl acrylate and dodecyl acrylate, and the corresponding methacrylates, lauryl methacrylate, stearyl methacrylate, methacrylic Decyl acid, isodecyl methacrylate and dodecyl methacrylate can be mentioned.

Examples of hydroxyl (C ₁₀ -C ₃₀ ) (meth)acrylates include hydroxyllauryl acrylate, hydroxystearyl acrylate, hydroxydecyl acrylate, hydroxyl isodecyl acrylate and hydroxyl dodecyl acrylate, and the corresponding methacrylates, methacrylic acid Hydroxylauryl, hydroxystearyl methacrylate, hydroxydecyl methacrylate, hydroxyisodecyl methacrylate and hydroxydodecyl methacrylate.

(b) It is preferred that the amphiphilic polymer is made from C _10-30 alkyl (meth)acrylates and at least one of acrylic acid, methacrylic acid and their esters. As esters of acrylic acid and methacrylic acid, mention may be made of those described above [except for C _10-30 (meth)alkyl acrylates].

For example, (b) amphiphilic polymers are the following monomers (I) and (II):
_H2C =C( ^R1 ) ^COOR2 (I)
_H2C =C( ^R1 ) ^COOR3 (II)
(In the formula,
R ¹ is selected from H and CH ₃ , preferably from H,
R ² is selected from C _10-30 alkyl, preferably C _12-26 alkyl, more preferably C _12-22 alkyl, and
R ³ is selected from H and C _1-4 alkyl, such as methyl)
can preferably be made or obtained by polymerizing the

(b) the amphiphilic polymer comprises the following monomers (I') and (II):
_H2C = ^CHCOOR2 (I')
_H2C =C( ^R1 ) ^COOR3 (II)
(In the formula,
^R1 is selected from H and _CH3 ;
R ² is selected from C _10-30 alkyl, preferably C _12-26 alkyl, more preferably C _12-22 alkyl, and
R ³ is selected from H and C _1-4 alkyl, such as methyl)
It may be more preferred to be made or obtained by polymerizing the

(b) It is preferred that the amphiphilic polymer is crosslinked.

(b) amphiphilic polymers may be selected from polymers formed from mixtures of monomers including:
(i) (meth)acrylic acid, preferably acrylic acid,
(ii) formula (I) above, wherein R ¹ represents H or CH ₃ , preferably H, R ² is 10 to 30 carbon atoms, preferably 12 to 26 carbon atoms, more preferably an alkyl group having 12 to 22 carbon atoms),
(iii) Well-known copolymerizable polyethylenes such as diallyl phthalate, allyl (meth)acrylate, allyl ether of sucrose, allyl ether of pentaerythritol, divinylbenzene, (poly)ethylene glycol dimethacrylate, and methylenebisacrylamide. A crosslinker that is a polyunsaturated monomer. Alkyl ethers include, for example, a 2-propenyl group.

Among copolymers of this type, 95-60% by weight acrylic acid (hydrophilic units), 4-40% by weight C ₁₀ -C ₃₀ alkyl acrylates (hydrophobic units), and 0 to 6% by weight of crosslinkable monomers, or 98-96% by weight of acrylic acid (hydrophilic units), 1-4% by weight of C ₁₀ -C ₃₀ alkyl acrylates (hydrophobic units), and 0.1-0.6% More particularly those consisting of % by weight of crosslinkable monomers will be used.

(b) amphiphilic polymers are acrylates/C _10-30 alkyl acrylate crosspolymer, acrylates/ethylhexyl acrylate crosspolymer, C _8-22 alkyl acrylate/methacrylic acid crosspolymer, potassium acrylate/C _10-30 alkyl acrylate crosspolymers, sodium acrylate/C _10-30 alkyl acrylate crosspolymers, and mixtures thereof.

Among said polymers mentioned above, Acrylates/C ₁₀ -C ₃₀ Alkyl Acrylate Copolymers (INCI name: Acrylates/C ₁₀ -C ₃₀ Alkyl Acrylate Crosspolymers), e.g. Very particular preference is given in the present invention to the products sold under the trade marks TR2, Pemulen EZ4U, Carbopol® Ultrez 20 Polymer, Carbopol® 1382 and Carbopol® EDT 2020.

(b) Amphiphilic polymers can function as thickeners, preferably as hydrophilic thickeners.

The amount of (b) amphiphilic polymer in the composition according to the invention may be 0.01% by weight or more, preferably 0.05% by weight or more, more preferably 0.1% by weight or more, relative to the total weight of the composition. good.

On the other hand, the amount of (b) amphiphilic polymer in the composition according to the invention is no more than 10% by weight, preferably no more than 5% by weight, more preferably no more than 1% by weight, relative to the total weight of the composition. may be

The amount of (b) amphiphilic polymer in the composition according to the invention is between 0.01% and 10% by weight, preferably between 0.05% and 5% by weight, more preferably 0.1% by weight relative to the total weight of the composition. % to 1% by mass.

(alkyl phosphate)
The composition according to the invention comprises (c) at least one alkyl phosphate. A single type of alkyl phosphate or a combination of two or more different types of alkyl phosphate can be used.

(c) Alkyl phosphates that may be used in the compositions according to the present patent application are preferably from C ₁₀ -C ₃₀ , preferably C ₁₂ -C ₂₄ , more preferably C ₁₆ -C ₁₈ alkyl phosphates, and mixtures thereof You can choose.

(c) Alkyl phosphates may be mono-alkyl phosphates and/or di-alkyl phosphates.

(c) Alkyl phosphates may be in the form of salts. Salts may be in the form of inorganic salts such as alkali metal, alkaline earth metal, or ammonium salts, and mixtures thereof. Alternatively, the salt may be in the form of an organic salt such as an amine salt, eg triethanolamine salt.

The (c) alkyl phosphate, which may be in the form described above, may be selected from cetyl phosphate, stearyl phosphate, cetearyl phosphate, and mixtures thereof. (c) that the alkyl phosphate is cetyl phosphate sold, for example, under the names Amphisol K (DSM Nutritional Products), Amphisol A (Roche), Arlatone MAP (Uniqema) and Crodafos MCA (Croda); preferable.

(c) Alkyl phosphates can function as surfactants, preferably as anionic surfactants.

The amount of (c) alkyl phosphate in the composition according to the invention may be 0.01% by weight or more, preferably 0.05% by weight or more, more preferably 0.1% by weight or more, relative to the total weight of the composition.

On the other hand, the amount of (c) alkyl phosphate in the composition according to the invention is 10% by weight or less, preferably 5% by weight or less, more preferably 1% by weight or less, relative to the total weight of the composition. may

The amount of (c) alkyl phosphate in the composition according to the invention is from 0.01% to 10%, preferably from 0.05% to 5%, more preferably from 0.1% to 10% by weight, relative to the total weight of the composition. It may be 1% by mass.

(water)
The composition according to the invention comprises (d) water.

(d) Water can form the aqueous phase of the composition according to the invention.

The amount of water in the composition according to the invention may be 30% by weight or more, preferably 40% by weight or more, more preferably 50% by weight or more, relative to the total weight of the composition.

The amount of water in the composition according to the invention may be 90% by weight or less, preferably 80% by weight or less, more preferably 70% by weight or less, relative to the total weight of the composition.

The amount of water in the composition according to the invention is 30% to 90%, preferably 40% to 80%, more preferably 50% to 80% by weight, relative to the total weight of the composition. It can be a range.

(oil)
The composition according to the invention may comprise (e) at least one oil. A single type of oil or a combination of two or more different types of oil can be used.

(e) Oils may form the oil phase in compositions according to the invention.

As used herein, "oil" means a fatty compound or substance typically in liquid or paste form at atmospheric pressure (760 mmHg) and room temperature (25°C). As oils, those commonly used in cosmetics can be used alone or in combination. These oils may be volatile or non-volatile.

The oils may be hydrocarbon oils, non-polar oils such as silicone oils, polar oils such as vegetable or animal oils and ester or ether oils, or mixtures thereof.

The oil can be selected from the group consisting of oils of vegetable or animal origin, synthetic oils, silicone oils, hydrocarbon oils and fatty alcohols.

Examples of vegetable oils include, for example, linseed oil, camellia oil, macadamia nut oil, corn oil, mink oil, olive oil, avocado oil, sasanqua oil, castor oil, safflower oil, jojoba oil, sunflower oil, almond oil, rapeseed oil, sesame oil, Mention may be made of soybean oil, peanut oil, and mixtures thereof.

Examples of animal oils include, for example, squalene and squalane.

Examples of synthetic oils include alkane oils such as isododecane and isohexadecane, ester oils, ether oils, and artificial triglycerides.

The ester oils are preferably saturated or unsaturated, linear or branched C ₁ -C ₂₆ aliphatic mono- or polyacids and saturated or unsaturated, linear or branched C Liquid esters with ₁ to C ₂₆ aliphatic monoalcohols or polyalcohols, where the total number of carbon atoms in these esters is 10 or more.

Preferably, in esters of monoalcohols, at least one of the alcohols and acids from which the esters of the invention are derived is branched.

Among the monoesters of monoacids and monoalcohols: ethyl palmitate, ethylhexyl palmitate, isopropyl palmitate, dicaprylyl carbonate, alkyl myristates, such as isopropyl myristate or ethyl myristate, isocetyl stearate, 2-ethylhexyl isononanoate , isononyl isononanoate, isodecyl neopentanoate and isostearyl neopentanoate.

Esters of C ₄ -C ₂₂ dicarboxylic or tricarboxylic acids with C ₁ -C ₂₂ alcohols, and monocarboxylic, dicarboxylic or tricarboxylic acids with non-sugar C ₄ -C ₂₆ dihydroxy, trihydroxy, tetrahydroxy or Esters with pentahydroxy alcohols can also be used.

Particular mention may be made of diethyl sebacate, isopropyl lauroyl sarcosinate, diisopropyl sebacate, bis(2-ethylhexyl) sebacate, diisopropyl adipate, di-n-propyl adipate, dioctyl adipate, bis( 2-ethylhexyl), diisostearyl adipate, bis(2-ethylhexyl) maleate, triisopropyl citrate, triisocetyl citrate, triisostearyl citrate, glyceryl trilactate, glyceryl trioctanoate, trioctyldodecyl citrate, citric acid They are trioleyl acid, neopentyl glycol diheptanoate, and diethylene glycol diisononanoate.

As ester oils, sugar esters and diesters of C ₆ -C ₃₀ , preferably C ₁₂ -C ₂₂ fatty acids can be used. It is recalled that the term "sugar" means an oxygen-bearing hydrocarbon-based compound containing at least 4 carbon atoms containing some alcohol functionality, with or without an aldehyde or ketone functionality. be done. These sugars may be monosaccharides, oligosaccharides or polysaccharides.

Examples of suitable sugars that may be mentioned include alkyls such as sucrose (or sucrose), glucose, galactose, ribose, fucose, maltose, fructose, mannose, arabinose, xylose and lactose and derivatives thereof, especially the methyl derivative. Derivatives, such as methyl glucose, are included.

Sugar esters of fatty acids are from the group consisting of esters or ester mixtures of the aforementioned sugars with linear or branched, saturated or unsaturated C ₆ -C ₃₀ , preferably C ₁₂ -C ₂₂ fatty acids. can be selected in particular. When they are unsaturated, these compounds can have 1-3 conjugated or non-conjugated carbon-carbon double bonds.

Esters according to this variant can also be selected from monoesters, diesters, triesters, tetraesters and polyesters, and mixtures thereof.

These esters are, for example, oleates, laurates, palmitates, myristates, behenates, coconut fatty acid esters, stearates, linoleates, linolenates, caprates and arachidonates. or mixtures thereof, such as mixed esters of oleopalmitic acid, oleostearic acid and palmitostearic acid, among others, and pentaerythrityl tetraethylhexanoate.

More particularly mono- and diesters, especially monooleate or dioleate esters of sucrose, glucose or methylglucose, stearates, behenates, oleopalmitates, linoleates, linolenates and oleates A stearic acid ester is used.

One example that may be mentioned is the product sold under the name Glucate® DO by the company Amerchol, which is methylglucose dioleate.

Examples of preferred ester oils include diisopropyl adipate, dioctyl adipate, 2-ethylhexyl hexanoate, ethyl laurate, cetyl octanoate, octyldodecyl octanoate, isodecyl neopentanoate, myristyl propionate, 2-ethylhexanoate. -ethylhexyl, 2-ethylhexyl octanoate, 2-ethylhexyl caprylate/caprate, methyl palmitate, ethyl palmitate, isopropyl palmitate, dicaprylyl carbonate, isopropyl lauroyl sarcosinate, isononyl isononanoate, ethylhexyl palmitate, isohexyl laurate, Hexyl Laurate, Isocetyl Stearate, Isopropyl Isostearate, Isopropyl Myristate, Isodecyl Oleate, Glyceryl Tri(2-ethylhexanoate), Pentaerythrityl Tetra(2-ethylhexanoate), 2-Ethylhexyl Succinate, Sebacic Acid Mention may be made of diethyl, and mixtures thereof.

Examples of artificial triglycerides include, for example, caprylic caprylyl glyceride, glyceryl trimyristate, glyceryl tripalmitate, glyceryl trilinolenate, glyceryl trilaurate, glyceryl tricaprate, glyceryl tricaprylate, tri(capric/caprylic) glyceryl and Mention may be made of tri(capric/caprylic/linolenic)glyceryl.

Examples of silicone oils include linear organopolysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, etc.; cyclic organopolysiloxanes such as cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethyl Cyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.; and mixtures thereof.

Preferably, the silicone oil is selected from liquid polydialkylsiloxanes, in particular liquid polydimethylsiloxanes (PDMS) containing at least one aryl group and liquid polyorganosiloxanes.

These silicone oils may also be organically modified. Organomodified silicones that can be used according to the invention are silicone oils as defined above, which contain in their structure one or more organic functional groups bonded via a hydrocarbon-based group. is oil.

Organopolysiloxanes are defined in detail by Walter Noll, "Chemistry and Technology of Silicones" (1968), Academic Press. Organopolysiloxanes may be volatile or nonvolatile.

If they are volatile, the silicones are more particularly selected from those having a boiling point between 60°C and 260°C, and even more particularly from:
(i) cyclic polydialkylsiloxanes containing 3 to 7, preferably 4 to 5, silicon atoms; These are, for example, the octamethylcyclotetrasiloxane sold in particular by the company Union Carbide under the name Volatile Silicone® 7207 or by the company Rhodia under the name Silbione® 70045 V2, by the company Union Carbide under the name Volatile Silicone ® 7158, sold under the name Silbione® 70045 V5 by Rhodia, and dodecamethylcyclopentasiloxane sold under the name Silsoft 1217 by Momentive Performance Materials, and A mixture of these. Cyclocopolymers of the type dimethylsiloxane/methylalkylsiloxane, etc., of the formula below may also be mentioned, such as Silicone Volatile® FZ 3109 sold by Union Carbide.

Cyclocopolymers of the type dimethylsiloxane/methylalkylsiloxane, etc., with cyclic polydialkylsiloxanes may also be mentioned.
Mixtures of cyclic polydialkylsiloxanes and organosilicon compounds, such as mixtures of octamethylcyclotetrasiloxane and tetratrimethylsilylpentaerythritol (50/50), and octamethylcyclotetrasiloxane and oxy-1,1'-bis(2, Mixtures with 2,2',2',3,3'-hexatrimethylsilyloxy)neopentane may also be mentioned.
(ii) a linear volatile polydialkylsiloxane containing from 2 to 9 silicon atoms and having a viscosity at 25° C. of 5×10 ⁻⁶ m ² /s or less; An example is the decamethyltetrasiloxane sold especially under the name SH 200 by the company Toray Silicone. Silicones belonging to this class are also described in an article published in Cosmetics and Toiletries, Vol. 91, Jan. 76, pp. 27-32, Todd & Byers, Volatile Silicone Fluids for Cosmetics. The viscosity of silicones is measured at 25°C according to ASTM Standard 445 Appendix C.

Nonvolatile polydialkylsiloxanes may also be used. These non-volatile silicones are more particularly selected from polydialkylsiloxanes, among which polydimethylsiloxanes containing trimethylsilyl end groups can be mentioned primarily.

Among these polydialkylsiloxanes, mention may be made, without limitation, of the following commercial products:
- 47 and 70 047 series of Silbione® oils sold by Rhodia or Mirasil® oils, such as 70 047 V 500 000 oil,
- the Mirasil® series of oils sold by Rhodia,
- 200 series oils from Dow Corning, e.g. DC200 with a viscosity of ^60000mm2 /s, and
- Viscasil® oils from General Electric and certain oils from the SF series from General Electric (SF 96, SF 18).

Mention may also be made of polydimethylsiloxanes containing dimethylsilanol end groups, known by the name dimethiconol (CTFA), such as the 48 series oils from Rhodia.

Among the silicones containing aryl groups, mention may be made of polydiarylsiloxanes, especially polydiphenylsiloxanes and polyalkylarylsiloxanes such as phenylsilicone oils.

Phenyl silicone oil has the following formula:

(In the formula,
R ₁ to R ₁₀ are, independently of each other, saturated or unsaturated, linear, cyclic or branched C ₁ to C ₃₀ hydrocarbon-based groups, preferably C ₁ to C ₁₂ hydrocarbon-based groups, and more preferably C ₁ -C ₆ hydrocarbon-based radicals, especially methyl, ethyl, propyl or butyl radicals,
m, n, p and q are each independently an integer of 0 to 900 inclusive, preferably 0 to 500 inclusive, more preferably 0 to 100 inclusive;
However, the sum n+m+q must be other than 0)
of phenyl silicones.

Examples that may be mentioned include products marketed under the following names:
- 70 641 series of Silbione® oils from Rhodia,
- Rhodorsil® 70 633 series and 763 series oils from Rhodia,
- Dow Corning 556 Cosmetic Grade Fluid Oil from Dow Corning,
- PK series silicones from Bayer, e.g. PK20 products, as well as
- Certain oils of the SF series from General Electric, such as SF 1023, SF 1154, SF 1250 and SF 1265.

Phenyl trimethicone (wherein R ₁ to R ₁₀ are methyl, p, q and n=0 and m=1) is preferred as the phenyl silicone oil.

Organically modified liquid silicones may contain, inter alia, polyethyleneoxy and/or polypropyleneoxy groups. Mention may therefore be made of the silicone KF-6017 proposed by Shin-Etsu Chemical Co., Ltd., and the Silwet® L722 and L77 oils from Union Carbide.

Hydrocarbon oils can be chosen from:
- _C6 - _C16 lower alkanes, linear or branched, optionally cyclic. Examples that may be mentioned include hexane, undecane, dodecane, tridecane and isoparaffins, such as isohexadecane, isododecane and isodecane, and
- straight or branched hydrocarbons containing more than 16 carbon atoms, such as liquid paraffin, liquid petrolatum, polydecene and hydrogenated polyisobutene, such as Parleam®, and squalane.

Preferred examples of hydrocarbon oils include, for example, linear or branched hydrocarbons such as isohexadecane, isododecane, squalane, mineral oils (e.g. liquid paraffin), paraffin, petrolatum or petroleum, naphthalene, etc.; hydrogenated polyisobutene; , isoeicosane and decene/butene copolymers; and mixtures thereof.

The term "fat" in fatty alcohols means those containing a relatively large number of carbon atoms. Thus alcohols with 4 or more, preferably 6 or more, more preferably 12 or more carbon atoms are included within the scope of fatty alcohols. Fatty alcohols may be saturated or unsaturated. Fatty alcohols may be linear or branched.

Fatty alcohols have the structure R-OH, where R contains 4 to 40 carbon atoms, preferably 6 to 30 carbon atoms, more preferably 12 to 20 carbon atoms, saturated and unsaturated. saturated, linear and branched groups). In at least one embodiment, R may be selected from C ₁₂ -C ₂₀ alkyl groups and C ₁₂ -C ₂₀ alkenyl groups. R may or may not be substituted with at least one hydroxyl group.

Examples of fatty alcohols include lauryl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol, undecylenyl alcohol, myristyl alcohol, octyldodecanol, hexyldecanol, oleyl alcohol, linoleyl alcohol, palmitoleyl alcohol, arachidonyl alcohol, Erucyl alcohol, and mixtures thereof may be mentioned.

It is preferred that the fatty alcohol is a saturated fatty alcohol.

Fatty alcohols are therefore linear or branched, saturated or unsaturated C ₆ -C ₃₀ alcohols, preferably linear or branched, saturated C ₆ -C 30 alcohols, more preferably linear or branched, saturated or unsaturated C 6 -C ₃₀ alcohols. It can be selected from linear or branched, saturated C ₁₂ -C ₂₀ alcohols.

The term "saturated fatty alcohol" as used herein means an alcohol having a long aliphatic saturated carbon chain. Preferably, the saturated fatty alcohol is selected from any linear or branched, saturated _C6 - _C30 fatty alcohol. Among the linear or branched, saturated C ₆ -C ₃₀ fatty alcohols, linear or branched, saturated C ₁₂ -C ₂₀ fatty alcohols can preferably be used. Any linear or branched saturated C ₁₆ -C ₂₀ fatty alcohol can more preferably be used. Branched C ₁₆ -C ₂₀ fatty alcohols can even more preferably be used.

Examples of saturated fatty alcohols include lauryl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol, undecylenyl alcohol, myristyl alcohol, octyldodecanol, hexyldecanol, and mixtures thereof. In one embodiment, cetyl alcohol, stearyl alcohol, octyldodecanol, hexyldecanol, or mixtures thereof (eg, cetearyl alcohol) as well as behenyl alcohol may be used as saturated fatty alcohols.

According to at least one embodiment, the fatty alcohol used in the composition according to the invention is preferably chosen from cetyl alcohol, octyldodecanol, hexyldecanol and mixtures thereof.

The amount of (e) oil in the composition used in the present invention is 0.01 wt% or more, preferably 0.1 wt% or more, more preferably 1 wt% or more, even more preferably, relative to the total weight of the composition. may be 10% by mass or more.

On the other hand, the amount of (e) oil in the composition used in the present invention is 50% by weight or less, preferably 40% by weight or less, more preferably 30% by weight or less, relative to the total weight of the composition. , and more preferably 20% by mass or less.

The amount of (e) oil in the composition used in the present invention is 0.01% to 50%, preferably 0.1% to 40%, more preferably 1% by weight, relative to the total weight of the composition. % to 30% by weight, even more preferably 10% to 20% by weight.

(beauty active ingredient)
The composition according to the invention may further comprise (f) at least one cosmetically active ingredient selected from the group consisting of vitamin C and its derivatives, salicylic acid and its derivatives, alpha-hydroxy acids, and mixtures thereof. A single type of such component can be used, or two or more different types of such component can be used in combination.

(f) the cosmetically active ingredient is stable in the composition according to the invention which is acidic so that it can retain its activity intact.

Vitamin C and its Derivatives Vitamin C has the D-configuration or the L-configuration, with the L-configuration being preferably utilized. Vitamin C is also called ascorbic acid and has the effect of inhibiting the production of melanin due to the strong reducing effect of ascorbic acid. The derivative of ascorbic acid may be a salt of ascorbic acid, the salt of ascorbic acid being preferably selected from sodium ascorbate, magnesium ascorbyl phosphate and sodium ascorbyl phosphate. Derivatives of ascorbic acid may be glycosides of ascorbic acid or may be esters of ascorbic acid. Examples of glycosides of ascorbic acid include, for example, ascorbyl glucoside. Examples of esters of ascorbic acid include, for example, silyl ascorbate, tocopheryl ascorbate and alkyl ascorbates. Methyl ascorbate or ethyl ascorbate is preferably used as alkyl ascorbate. In particular, ascorbyl glucoside is preferred. Ascorbic acid or derivatives thereof may be used alone or in combination of two or more types thereof.

Specific examples of derivatives of ascorbic acid include, for example, 5,6-di-O-dimethylsilylascorbate, commercially available as PRO-AA from Exsymol SAM; -α-tocopheryl-2-l-ascorbyl phosphate; sodium ascorbyl phosphate, commercially available from Roche as Stay-C 50; ascorbyl glucoside, commercially available from Hayashibara Co.; be able to.

Salicylic acid and its derivatives Salicylic acid has the following chemical formula:

is represented by

As a salicylic acid derivative, for example any derivative that can be used in cosmetic and/or dermatological compositions, in particular the following formula (I):

[In the formula,
R ₁ is hydrogen or a saturated, linear, branched or cyclic, aliphatic, alkoxy, ester or ketone chain, an unsaturated chain carrying one or more conjugated or nonconjugated double bonds. Represents saturated chains, these chains containing from 1 to 22 carbon atoms and esterified with halogen atoms, trifluoromethyl groups, in free form or with acids having from 1 to 6 carbon atoms , or substituted with at least one substituent selected from hydroxyl groups esterified with carboxyl functional groups, which are free or with lower alcohols having 1 to 6 carbon atoms. is esterified,
R ₂ is a hydroxyl group, or the following formula (II):

(wherein R ₄ represents a saturated aliphatic group or an alkenyl group having 1 to 18 carbon atoms,
R ₃ represents hydrogen or a saturated or unsaturated, straight or branched chain having 2 to 30 carbon atoms and optionally containing one or more substituents. This chain can be chosen in particular from optionally substituted alkyl and alkenyl groups containing from 2 to 30 carbon atoms. Substituents may in particular be hydroxyl groups)
represents the ester functional group of]
or salts of such derivatives can be used.

When R ₃ is hydrogen, it is also possible to use the salts of the acids of formula (I) above, especially those obtained by salt formation with bases.

As bases with which it is possible to salt the salicylic acid derivatives of formula (I) above, inorganic bases such as alkali metal hydroxides (sodium hydroxide and potassium hydroxide) or ammonium hydroxide, or even better Organic bases such as primary amines, secondary amines, tertiary amines or cyclic organic amines, more particularly amino acids, may be mentioned without limitation. Examples of bases include glycine, lysine, arginine, taurine, histidine, alanine, valine, cysteine, trihydroxymethylaminomethane (TRISTA) and triethanolamine.

According to one particular embodiment of the invention, derivatives of formula (I) above are preferably used in the compositions of the invention in which the R ₁ group contains at least 4 carbon atoms. . It is formed, for example, from saturated linear alkyl or alkoxy groups having 4 to 11 carbon atoms.

Formula (I) above, wherein R ₁ is formed from a saturated linear alkyl or alkoxy group having 4 to 11 carbon atoms, R ₂ is hydroxyl, and R ₃ is 5-n-octanoylsalicylic acid (CTFA name: capryloylsalicylic acid), 5-n-decanoylsalicylic acid, 5-n-dodecanoylsalicylic acid, 5-n-octylsalicylic acid, 5-n-octylsalicylic acid, 5 -n-heptyloxysalicylic acid, 5-tert-octylsalicylic acid, 5-butoxysalicylic acid, 5-ethoxysalicylic acid, 5-methoxysalicylic acid, 5-propoxysalicylic acid, 5-methylsalicylic acid, 5-ethylsalicylic acid and 5-propylsalicylic acid, and Mixtures thereof may be mentioned, these acids are generally salted with a base, and the compounds described in document EP-A-570230 can also be used.

When R ₁ represents hydrogen and R ₂ represents a hydroxyl group, the derivatives of formula (I) above are salicylates. This preferably includes esters of fatty alcohols such as dodecyl, hexadecyl, stearyl, cetyl, myristyl, linoleyl, octyl, oleyl and tridecyl alcohols, or also esters of butyl, propyl and ethyl alcohols, or esters of polyols. , for example, propylene glycol, butylene glycol, ethylene glycol or glycerol esters, or mixtures of these esters. This may include cetyl salicylate, dodecyl salicylate and tridecyl salicylate, among others.

Alpha-Hydroxy Acids The term "alpha-hydroxy acid" or "AHA" as used herein means a carboxylic acid having at least one hydroxyl group on the adjacent (alpha-) carbon atom.

Alpha-hydroxy acids can be selected from, for example, glycolic acid, lactic acid, maleic acid, citric acid, tartaric acid, mandelic acid and gluconic acid, and mixtures thereof.

The amount of (f) the cosmetic active ingredient in the composition used in the present invention is 0.001% by mass or more, preferably 0.01% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the composition. may

On the other hand, the amount of (f) cosmetically active ingredient in the composition used in the present invention is 10% by mass or less, preferably 5% by mass or less, more preferably 1% by mass, relative to the total mass of the composition. % or less.

The amount of (f) cosmetically active ingredient in the composition used in the present invention is 0.001% to 10% by weight, preferably 0.01% to 5% by weight, more preferably 0.01% to 5% by weight, relative to the total weight of the composition. It may be in the range of 0.1% by mass to 1% by mass.

(pH)
The composition according to the invention is acidic. Accordingly, the pH of the composition according to the invention, in particular the pH of its aqueous phase, is below 7.0, preferably below 6.0, more preferably below 5.0, even more preferably below 4.0.

Among the acidifying agents, mention may be made, by way of example, of mineral or organic acids such as hydrochloric acid, ortho-phosphoric acid, sulfuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid and lactic acid, and sulfonic acids.

Among the basifying agents, for example, ammonium hydroxide, alkali metal carbonates, alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, as well as derivatives thereof, sodium hydroxide or potassium hydroxide, and formula:

(In the formula,
W represents an alkylene, such as propylene, optionally substituted with a hydroxyl group or a _C1 - _C4 alkyl group, and R _a , R _b , R _c and R _d are independently a hydrogen atom, an alkyl group, or indicates a _C1 - _C4 hydroxyalkyl group)
which may be exemplified by 1,3-propanediamine and derivatives thereof.

Acidifying or basifying agents are present in an amount of 0.001% to 5% by weight, preferably 0.01% to 3% by weight, more preferably 0.1% to 1% by weight, relative to the total weight of the composition according to the invention. may be used in amounts ranging from

(polyol)
A composition according to the invention may comprise at least one polyol. A single type of polyol may be used, but two or more different types of polyols may also be used in combination.

The term "polyol" as used herein means an alcohol with two or more hydroxy groups and does not include sugars or derivatives thereof. Derivatives of sugars include sugar alcohols obtained by reducing one or more carbonyl groups of sugars, as well as those in which one or more hydrogen atoms in one or more hydroxy groups thereof are replaced by alkyl groups, hydroxy Examples include sugars or sugar alcohols substituted with at least one substituent such as an alkyl group, alkoxy group, acyl group or carbonyl group.

The polyols used in the present invention are liquid at room temperature such as 25° C. under atmospheric pressure (760 mmHg or 105 Pa).

The polyol may be a C _2-24 polyol, preferably a C _2-9 polyol, containing at least 2 hydroxy groups, preferably 2-5 hydroxy groups.

Polyols may be natural or synthetic polyols. Polyols may have a linear, branched or cyclic molecular structure.

Polyols can be selected from glycerin and its derivatives, and glycol and its derivatives. Polyols include glycerin, diglycerin, polyglycerin, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, pentylene glycol, hexylene glycol, _C6 - _C24 polyethylene glycol, 1,3-propanediol, 1 ,4-butanediol and 1,5-pentanediol.

The amount of polyol in the composition used in the present invention may be 0.1% by weight or more, preferably 1% by weight or more, more preferably 10% by weight or more, relative to the total weight of the composition.

On the other hand, the amount of polyol in the composition used in the present invention is 40% by weight or less, preferably 35% by weight or less, more preferably 30% by weight or less, relative to the total weight of the composition. good too.

The amount of polyol in the composition used in the present invention is 0.1% to 40% by weight, preferably 1% to 35% by weight, more preferably 10% to 30% by weight, relative to the total weight of the composition. It may be in the range of % by mass.

(other optional ingredients)
The composition according to the invention comprises one or more monoalcohols in liquid form at room temperature (25° C.), for example linear or branched monoalcohols containing from 1 to 6 carbon atoms, such as ethanol, It may contain propanol, butanol, isopropanol, isobutanol, pentanol and hexanol.

The amount of monoalcohol in the composition used in the present invention may be 0.01% by weight or more, preferably 0.1% by weight or more, more preferably 1% by weight or more, relative to the total weight of the composition.

On the other hand, the amount of monoalcohol in the composition used in the present invention is 15% by weight or less, preferably 10% by weight or less, more preferably 5% by weight or less, relative to the total weight of the composition. may

The amount of monoalcohol in the composition used in the present invention is 0.01% to 15% by weight, preferably 0.1% to 10% by weight, more preferably 1% to 1% by weight, relative to the total weight of the composition. It may be in the range of 5% by mass.

Compositions according to the invention may also contain various adjuvants conventionally used in cosmetic compositions, e.g. ionic polymers, anionic, nonionic, cationic and amphoteric surfactants, antioxidants, chelating agents, sequestrants, fragrances, dispersants, modifiers, film formers, preservatives, co-preservatives, and mixtures thereof.

(preparation)
Compositions according to the present invention can be prepared by mixing the essential ingredients described above and the optional ingredients (if required) described above.

The method and means of mixing the above essential and optional ingredients are not limited. Any conventional methods and means can be used to mix the above essential and optional ingredients to prepare the compositions according to the present invention.

(form)
The form of the composition according to the present invention is not particularly limited, and may take various forms such as emulsion (O/W type or W/O type), aqueous gel, and aqueous solution.

If the composition according to the invention comprises at least one oil, it is preferably in the form of an O/W emulsion comprising an oil phase dispersed in a continuous aqueous phase. The dispersed oil phase can be oil droplets in the aqueous phase.

An O/W construction or structure consisting of an oil phase dispersed in an aqueous phase has an external aqueous phase and thus the composition according to the invention has an O/W construction or structure. In some cases, it can provide a pleasant sensation during use as there is a feeling of freshness that the aqueous phase can provide immediately.

Furthermore, the composition according to the invention may preferably be gelled, so that it can exhibit very good stability, for example when stored.

The composition according to the invention may be a cosmetic composition, preferably a skin cosmetic composition, more preferably a skin care or skin makeup cosmetic composition.

The compositions according to the invention are stable over long periods of time, even at low and high temperatures.

(beauty method)
The composition according to the invention is for the cosmetic treatment of keratinous substances such as skin, scalp, eyelashes, eyebrows, hair and nails, and mucous membranes such as lips, preferably skin and lips, more preferably facial skin and lips. can be used for

Thus, the present invention also relates to a cosmetic method for keratinous materials, preferably for skin and lips, comprising applying a composition according to the invention onto keratinous materials.

The present invention also provides (d) in a composition comprising water,
(a) at least one hydrophobically modified alkylcellulose;
(b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit;
(c) in combination with at least one alkyl phosphate,
It also relates to the use of combinations for stabilizing compositions, wherein the pH of said composition is less than 7.0, preferably less than 6.0, more preferably less than 5.0, even more preferably less than 4.0.

The invention will be explained in more detail by means of examples. However, these examples should not be construed as limiting the scope of the invention. The following examples are presented as non-limiting illustrations of the technical field of the invention.

(Examples 1-3 and Comparative Examples 1-9)
Compositions according to Examples 1-3 and Comparative Examples 1-9 were prepared by mixing the ingredients shown in Tables 1-3. All numerical values for the amounts of ingredients given in Tables 1-3 are based on "% by weight" of the active ingredients.

(evaluation)
The freshly prepared compositions according to Examples 1-3 and Comparative Examples 1-9 were stored in an airtight container at 60° C. for 1 week. The appearance of each composition was visually observed and evaluated according to the following criteria.
Good: Stable (no phase separation observed)
Poor: Slight phase separation (small volume of liquid released) Extremely Poor: Unstable (phase separation observed)

The results are shown in Tables 1-3.

As shown in Tables 1-3, an acidic and hydrophobically modified alkyl cellulose, an amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit, an alkyl phosphate, and water. The compositions according to Examples 1-3 containing are stable over time.

Compared to Example 1, Comparative Examples 1-4 show that both the hydrophobically modified alkyl cellulose and the amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit are treated under acidic conditions. are necessary for good stability at

Compared to Example 2, Comparative Examples 5-8 demonstrate that alkyl phosphate is necessary for good stability under acidic conditions.

Therefore, in view of Examples 1 and 2 and Comparative Examples 1-8, a hydrophobically modified alkyl cellulose, an amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit, and an alkyl phosphate is necessary for good stability under acidic conditions.

Example 3 and Comparative Example 9 demonstrate that the acrylate polymer having hydrophobic units composed of fatty chains with C _10-30 carbon atoms in Example 3 has the hydrophobic units used in Comparative Example 9. , demonstrating that it can provide better stability compared to acrylate polymers without

Claims (15)

(a) at least one hydrophobically modified alkylcellulose;
(b) at least one amphiphilic polymer comprising at least one hydrophilic unit and at least one hydrophobic unit containing from 10 to 30 carbon atoms ;
( _c ) at least one C10 _- C30 alkyl phosphate;
(d) a composition comprising water,
(a) the hydrophobically modified alkylcellulose is represented by the following formula (I):

[In the formula,
R1 ^, R2 ^and R3 are the same or different and are a hydrogen atom, a methyl group, a -[CH2CH2 _{- k (} CH3 ₎ kO _] mH ^group , or -CH2CH ₍ OH)CH ₂ OC _j H _2j+1 groups,
n is an integer from 100 to 10,000;
k is an integer of 1,
m is an integer from 1 to 10;
j is an integer from 6 to 26;
provided that the (a) hydrophobically modified alkylcellulose contains at least one —CH ₂ CH(OH)CH ₂ OC _j H _2j+1 group per molecule]
is represented by
(a) the amount of hydrophobically modified alkylcellulose in the composition is 0.01% by mass to 10% by mass relative to the total mass of the composition;
(b) the amphiphilic polymer in the composition is in an amount of 0.01% to 10% by weight relative to the total weight of the composition;
the amount of (c) alkyl phosphate in the composition is 0.01% by mass to 10% by mass relative to the total mass of the composition;
The composition, wherein the pH of the composition is less than 7.0. The composition according to claim 1 , wherein j in formula (I) is an integer from 16-20 . (a) Hydrophobic-modified alkylcellulose represented by formula (1) contains —CH ₂ CH(OH)CH ₂ OC _j H _2j+1 groups in an amount of 0.1 to 10.0 with respect to the total mass of the hydrophobically-modified alkylcellulose. 3. A composition according to claim 1 or 2, comprising in an amount of % by weight. (a) the hydrophobically modified alkyl cellulose represented by formula (1) contains 10.0 to 50.0% by mass of methyl groups and 3.0 to 20.0% by mass of -[CH ₂ CH _2-k ( _{CH3 ) kO} ] _mH groups and 0.1 to 10.0% by weight of _-CH2CH (OH) _{CH2OCjH2j +1} groups . The composition according to . The composition according to any one of claims 1 to 4, wherein the amount of (a) hydrophobically modified alkylcellulose in the composition is 0.05% to 5% by weight relative to the total weight of the composition. . (b) the amphiphilic polymer is made from at least one of _C10-30 alkyl (meth)acrylates and acrylic acid, methacrylic acid and esters thereof; 13. The composition of claim 1. 7. A composition according to any one of claims 1 to 6, wherein (b) the amphiphilic polymer is crosslinked. (b) the amphiphilic polymer is acrylates/C _10-30 alkyl acrylate crosspolymer, acrylates/ethylhexyl acrylate crosspolymer, C _8-22 alkyl acrylate/methacrylic acid crosspolymer, potassium acrylate/C _10-30 alkyl acrylate A composition according to any preceding claim, selected from the group consisting of crosspolymers, sodium acrylate/C _10-30 alkyl acrylate crosspolymers, and mixtures thereof. The composition according to any one of claims 1 to 8, wherein the amount of (b) amphiphilic polymer in the composition is from 0.05% to 5% by weight relative to the total weight of the composition. (c) The C _10-30 alkyl phosphate is selected from the group consisting of cetyl phosphate , stearyl phosphate, cetearyl phosphate, and mixtures thereof. Composition. A composition according to any one of claims 1 to _{10, wherein the amount of (c) C10-30} alkyl phosphate in the composition is from 0.05% to 5% by weight relative to the total weight of the composition. thing. A composition according to any one of claims 1 to 11, wherein the amount of (d) water in the composition is from 30% to 90% by weight relative to the total weight of the composition. 13. The composition of any one of claims 1-12, further comprising (e) at least one oil. 14. Any one of claims 1 to 13, further comprising (f) at least one cosmetic active ingredient selected from the group consisting of vitamin C and its derivatives, salicylic acid and its derivatives, α-hydroxy acids, and mixtures thereof. 10. The composition of claim 1. 15. A cosmetic method comprising applying a composition according to any one of claims 1 to 14 onto a keratin material.