composition
A stable cosmetic oleogel is achieved by combining acyl amino acids and surfactants with saturated fatty chains, ensuring long-term stability and preventing phase separation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2026-04-16
AI Technical Summary
Existing cosmetic oleogels are not stable over time, leading to phase separation after a short period of storage.
A composition comprising acyl amino acids, surfactants with at least two saturated fatty chains, and oils, which forms a stable oleogel through a solution-to-gel phase transition.
The composition maintains stability for at least one month without phase separation, providing a stable cosmetic formulation.
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Figure CN2024124044_16042026_PF_FP_ABST
Abstract
Description
COMPOSITIONTECHNICAL FIELD
[0001] The present invention relates to a composition. The present invention also relates to a non-therapeutic process for caring for keratin materials.BACKGROUND ART
[0002] The development for products for cosmetic use is permanent. Traditionally the cosmetic active ingredients have been delivered in liquid or semisolid formulations.
[0003] Liquid and semisolid formulations are available in various forms, including ointments, creams, foams, gels, or lotions etc.
[0004] Oil phase gelation is widely applied in the formulation of skincare, haircare, and makeup products.
[0005] To date, the formation of the oleogels is practically achieved by the addition of polymers, waxes, and low-molecular weight molecules. These oil gelling agents lead to the formation of oleogels via different mechanisms. The common characteristic they share is the presence of a solid-like nanoscale network spanning a continuous oil phase in three dimensions.
[0006] However, some cosmetic products in the form of oleogels are not satisfying since they are not stable, phase separation occurs after short period of storage.
[0007] It is desired that commercial products are stable over time, for example, can remain stable for at least one month.
[0008] Therefore, there is still a need to develop a composition, which is an oleogel and is stable over time.SUMMARY OF THE INVENTION
[0009] An object of the present invention is thus to develop a composition, which is an oleogel and is stable over time.
[0010] Thus, according to a first aspect, the present invention provides a composition comprising:
[0011] a)at least one acyl amino acid of formula (I) :
[0012] wherein,
[0013] -R1 represents hydrogen, - (CH2) m-N H2, - (CH2) n-COOH, - (CH2) p-OH, or a linear or branched C1-C20alkyl, m, n and p are independently an integer of 0-10;
[0014] -R2 represents a linear or branched, saturated or unsaturated hydrocarbon-based group, preferably selected from alkyl or alkenyl;
[0015] b) at least one surfactant with at least two saturated fatty chains; and
[0016] c) at least one oil.
[0017] The inventors have found that the composition according to the present invention can be in the form of oleogel and is stable over time (e.g., at least one month) .
[0018] The composition according to the present invention can be a cosmetic composition.
[0019] According to a second aspect, the present invention provides a non-therapeutic process for caring for keratin materials comprising applying the composition as described above onto the keratin materials.
[0020] Other subjects and characteristics, aspects and advantages of the present invention will be set forth in the description that follows, and in part, will be obvious from the description, or may be learned by practice of the present invention.DETAILED DESCRIPTION OF THE INVENTION
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art the present invention belongs to. When the definition of a term in the present description conflicts with the meaning as commonly understood by those skilled in the art the present invention belongs to, the definition described herein shall apply.
[0022] As used herein, unless otherwise indicated, the limits of a range of values are included within this range, in particular in the expressions "between…and…"and"from…to…” .
[0023] Moreover, the expression "at least one" used in the present description is equivalent to the expression "one or more".
[0024] Throughout the instant application, the term "comprising" is to be interpreted as encompassing all specifically mentioned features as well optional, additional, unspecified ones. As used herein, the use of the term “comprising” also discloses the embodiment wherein no features other than the specifically mentioned features are present (i.e., "consisting of") .
[0025] Unless otherwise specified, all numerical values expressing amount of ingredients and the like which are used in the description and claims are to be understood as being modified by the term "about". Accordingly, unless indicated to the contrary, the numerical values and parameters described herein are approximate values which are capable of being changed according to the desired purpose as required.
[0026] As used therein, the term "keratin materials" includes human keratin materials such as the hair and the skin.
[0027] All percentages in the present invention refer to weight percentage, unless otherwise specified.
[0028] For the purposes of the present invention and unless otherwise ind icated:
[0029] -an “alkyl” radical denotes a linear or branched saturated radical containing, for example, from 1 to 30 carbon atoms;
[0030] -an “alkenyl” radical denotes a linear or branched ethylenically unsaturated hydrocarbon-based group, for example, from 1 to 30 carbon atoms;
[0031] -an “alkoxy” radical denotes an alkyl-oxy radical with “alkyl” as defined previously.
[0032] Acyl amino acids
[0033] According to the first aspect, the composition of the present invention comprises at least one acyl amino acid of formula (I) :
[0034] wherein,
[0035] -R1 represents hydrogen, - (CH2) m-NH2, - (CH2) n-COOH, - (CH2) p-OH, or a linear or branched C1-C20alkyl, m, n and p are independently an integer of 0-10;
[0036] -R2 represents a linear or branched, saturated or unsaturated hydrocarbon-based group, preferably selected from alkyl or alkenyl.
[0037] Preferably, in formula (I) , R1represents hydrogen, - (CH2) m-N H2, - (CH2) n-COOH, - (CH2) p-OH, a linear C1-C6alkyl, m, n and p are independently an integer of 1-6, R2 represents a linear or branched C7-C21alkyl or alkenyl.
[0038] More preferably, in formula (I) , R1 represents hydrogen, - (CH2) m-NH2, -(CH2) n-COOH, - (CH2) p-OH, a linear C1-C4alkyl, m, n and p are independently an integer of 1-4, R2represents a linear or branched C7-C19 alkyl or alkenyl.
[0039] Still more preferably, in formula (I) , R1 represents hydrogen, - (CH2) m-N H2, - (CH2) n-COOH, - (CH2) p-OH, a linear C1-C4alkyl, m, n and p are independently an integer of 2-4, R2 represents a linear or branched C7-C17 alkyl or alkenyl.
[0040] Further more preferably, in formula (I) , R1represents hydrogen, - (CH2) 4-N H2, - (CH2) 2-COOH, - (CH2) 4-OH, or-CH3, R2represents a linear or branched C7-C17alkyl or alkenyl. Even more preferably, the acyl amino acid is selected from cocoyl glutamic acid, lauroyl glutamic acid, stearoyl glutamic acid, myristoyl glutamic acid, palmitoyl glutamic acid, oleoyl glutamic acid, cocoyl alanine, lauroyl alanine, stearoyl alanine, myristoyl alanine, palmitoyl alanine, oleoyl alanine, cocoyl glycine, lauroyl glycine, stearoyl glycine, myristoyl glycine, palmitoyl glycine, oleoyl glycine, cocoyl lysine, lauroyl lysine, stearoyl lysine, myristoyl lysine, palmitoyl lysine, oleoyl lysine, and mixtures thereof.
[0041] Even more preferably, the acyl amino acid is selected from cocoyl alanine, lauroyl alanine, stearoyl alanine, myristoyl alanine, palmitoyl alanine, oleoyl alanine, and mixtures thereof.
[0042] Most preferably, the composition according to the present invention comprises lauroyl alanine.
[0043] Advantageously, the acyl amino acid is present in the composition according to the present invention in an amount ranging from0.1wt. %to 30 wt.%, preferably from 0.5wt. %to 25wt. %, more preferably from 1 wt. % to 20 wt.%, even more preferably from 1.5wt. %to15wt. %, relative to the total weight of the composition.
[0044] Surfactants with at least two saturated fatty chains
[0045] According to the first aspect, the composition of the present invention comprises at least one surfactant with at least two saturated fatty chains.
[0046] Preferably, the surfactant with at least two saturated fatty chains is selected from anionic surfactants, cationic surfactants, and non-ionic surfactants, with at least two C5-22alkyl chains.
[0047] As anionic surfactants with at least two C5-22alkyl chains, mention can be made of, dialkyl sulfosuccinates with each alkyl containing from 5 to 22 carbon atoms, preferably from 8 to 18 carbon atoms (such as sodium diethylhexyl sulfosuccinate, sodium dihexyl sulfosuccinate) , sodium distearyl phosphate, sodium dilauryl phosphate, sodium dilauramidoglutamide lysine, ethylene bis (sodium N-dodecanoyl-asparatate) , etc.
[0048] As cationic surfactants with at least two C5-22alkyl chains, mention can be made of dialkyldimonium halides with each alkyl containing from 5 to 22 carbon atoms (such as dimethyldidodecylammonium bromide, distearyldimonium chloride, dicetyldimonium chloride,
[0049] dibehenyldimethylammonium chloride) , trialkyldimonium chlorides with each alkyl containing from 5 to 22 carbon atoms (such as tricetylmonium chloride, tristearylmonium chlorides) , and mixtures thereof.
[0050] As non-ionic surfactants with at least two C5-22alkyl chains, mention can be made of esters of polyols with fatty acids with a saturated chain containing from 5 to 22 carbon atoms, and alkoxylated derivatives thereof, such as (poly) ethylene glycol esters of a C5-C22, preferably C8-C18fatty acid and alkoxylated derivatives thereof; (poly) glyceryl esters of a C5-C22, preferably C8-C18fatty acid and alkoxylated derivatives thereof; sorbitol esters of a C5-C22, preferably C8-C18fatty acid and alkoxylated derivatives thereof; sucrose esters of a C5-C22, preferably C8-C18fatty acid and alkoxylated derivatives thereof; and a mixture thereof.
[0051] As examples of (poly) ethylene glycol esters, mention can be made of ethylene glycol dilaurate, ethylene glycol distearate, PEG-3 distearate, PEG-8 distearate, PEG-12 distearate, PEG-50 distearate, PEG-80 distearate, PEG-100 distearate, PEG-120 distearate, PEG-150 distearate, PEG-2 dilaurate, PEG-4 dilaurate, PEG-8 dilaurate, etc.
[0052] As examples of (poly) glyceryl esters of fatty acids, mention can be made of glyceryl distearate, glyceryl tristearate, glyceryl dilaurate, glyceryl dipalmitate, polyglyceryl distearate, polyglyceryl tristearate, polyglyceryl triisostearate such as polyglyceryl-2 triisostearate, polyglyceryl diisostearate such as polyglyceryl-3 diisostearate, polyglyceryl dicaprate such as polyglyceryl-6 dicaprate, etc., with2-10 glycerol units for polyglyceryl esters.
[0053] As examples of sorbitol esters, mention can be made of sorbitan tristearate.
[0054] As examples of sucrose esters, mention can be made of sucrose dilaurate, sucrose trilaurate, sucrose tristearate, etc.
[0055] Preferably, the surfactant with at least two saturated fatty chains is selected from dialkyl sulfosuccinates with each alkyl containing from 5 to 22 carbon atoms, (poly) glyceryl diesters of a C5-C22fatty acid, and mixtures thereof.
[0056] More preferably, the surfactant with at least two saturated fatty chains is selected from dialkyl sulfosuccinates with each alkyl containing from 8 to 18 carbon atoms, polyglyceryl diesters of a C8-C18fatty acid with 2-10 glycerol units, and mixtures thereof.
[0057] Even more preferably, the surfactant with at least two saturated fatty chains is selected from sodium diethylhexyl sulfosuccinate, polyglyceryl-6 dicaprate, and mixtures thereof.
[0058] Advantageously, the surfactant with at least two saturated fatty chains is present in the composition of according to the present invention in an amount ranging from0.1wt. %to35wt. %, preferably from 0.5wt. %to 30 wt.%, more preferably from 1 wt. % to 25 wt. %, even more preferably from 3 wt.%to20wt. %, relative to the total weight of the composition.
[0059] Preferably, the weight ratio of the surfactant with at least two saturated fatty chains to the acyl amino acid is at least0.5: 1, preferably from0.8: 1-5: 1.
[0060] Oils
[0061] According to the first aspect, the composition of the present invention comprises at least one oil.
[0062] The oil (s) may be chosen from volatile or nonvolatile, polar or nonpolar, hydrocarbon-based oils, silicon oils, and mixtures thereof.
[0063] The term “oil” is understood to mean a fatty substance which is liquid at room temperature (25℃) and atmospheric pressure (760mmHg, i.e. 1.013×105Pa) . The oil may be volatile or non-volatile.
[0064] Within the meaning of the present invention, the term “silicone oil” is understood to mean an oil comprising at least one silicon atom and in particular at least one Si-O group, and more particularly an organopolysiloxane.
[0065] The term “hydrocarbon-based oil” is understood to mean an oil containing mainly carbon and hydrogen atoms and possibly one or more functions chosen from hydroxyl, ester, ether, or carboxyl functions. These oils are thus different from silicone oils.
[0066] For the purposes of the invention, the term “volatile oil” refers to any oil that is capable of evaporating on contact with the skin in less than one hour, at room temperature and atmospheric pressure. The volatile oil is a volatile cosmetic compound, which is liquid at room temperature, notably having a non-zero vapor pressure, at room temperature and atmospheric pressure, notably having a vapor pressure ranging from 2.66 Pa to 40000 Pa, in particular ranging from2.66 Pa to 13000 Pa and more particularly ranging from 2.66 Pa to 1300 Pa.
[0067] The term “nonvolatile oil” refers to an oil that remains on the skin at room temperature and atmospheric pressure for at least several hours, and that notably has a vapor pressure of less than2.66Pa, preferably less than 0.13 Pa. By way of example, the vapor pressure may be measured via the static method or via the effusion method by isothermal thermogravimetry, depending on the vapor pressure (standard OCDE104) .
[0068] Volatile hydrocarbon-based oils
[0069] Among the volatile hydrocarbon-based oils, mention may more particularly be made of those chosen from hydrocarbon-based oils of hydrocarbon type (thus nonpolar hydrocarbon-based oils, consisting solely of carbon and hydrogen) and also of ester type. In particular, they may be chosen from volatile hydrocarbon-based oils containing from 8 to 16 carbon atoms, and mixtures thereof, and notably:
[0070] -branched C8-C16alkanes, such as isoalkanes (also known as isoparaffins) , isododecane, isodecane, isohexadecane and mixtures thereof, and, for example, the oils sold under the trade names Isopar or Permethyl,
[0071] -linear alkanes, for example C11-C15alkanes, alone or as mixtures,
[0072] -branched C8-C16esters, for example isohexyl neopentanoate, and
[0073] -mixtures thereof.
[0074] Other volatile hydrocarbon oils, such as petroleum distillates, in particular those sold under the name Shell Solt by Shell, can also be used; volatile linear alkanes, such as those described in the patent application DE10 2008 012 457 from Cognis.
[0075] Volatile silicone oils
[0076] Among the volatile silicon oils, mention may be made, inter alia, of linear, branched or cyclic silicone oils such as polydimethylsiloxanes (PDMS) having from 3 to 7 silicon atoms, preferably linear or branched polydimethylsiloxanes having from 3 to 7 silicon atoms; and also the mixtures thereof.
[0077] Examples of such oils that may be mentioned include octyl trimethicone, hexyl trimethicone, methyl trimethicone, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, dodecamethylcyclohexasiloxane, decamethyltetrasiloxane, polydimethylsiloxanes such as those sold under the reference DC200 (1.5cSt) , or DC200 (3cSt) by Dow Corning or KF96A from Shin-Etsu; alone or as mixtures.
[0078] Polar nonvolatile hydrocarbon-based oils
[0079] A “polar hydrocarbon-based oil” denotes an oil containing mainly hydrogen and carbon atoms and also comprising at least one oxygen atom. More particularly, such an oil comprises one or more functions chosen from hydroxyl, ester, ether, or carboxyl functions, and preferably hydroxyl, ester, or ether functions.
[0080] As examples of nonvolatile hydrocarbon-based oils that can be used in the invention, mention may be made of:
[0081] -triglycerides constituted of fatty acid esters of glycerol, in particular the fatty acids of which may have chain lengths ranging from C4 to C36, and notably from C12 to C36, these oils possibly being linear or branched, and saturated or unsaturated; these oils may notably be heptanoic or octanoic triglycerides, wheatgerm oil, sunflower oil, grapeseed oil, sesame seed oil, corn oil, apricot oil, castor oil, shea oil, avocado oil, olive oil, soybean oil, sweet almond oil, palm oil, rapeseed oil, cottonseed oil, hazelnut oil, macadamia oil, jojoba oil, alfalfa oil, poppy oil, pumpkin oil, marrow oil, blackcurrant oil, evening primrose oil, millet oil, barley oil, quinoa oil, rye oil, safflower oil, candlenut oil, passionflower oil or musk rose oil; or alternatively caprylic / capric acid triglycerides, for instance those sold by Stéarinerie Dubois or those sold under the names Miglyol and by Dynamit Nobel;
[0082] -linear aliphatic hydrocarbon-based esters of formula RCOOR' in which RCOO represents a carboxylic acid residue including from 2 to 40 carbon atoms, and R' represents a hydrocarbon-based chain containing from 1 to 40 carbon atoms, such as cetostearyl octanoate, isopropyl alcohol esters, such as isopropyl myristate or isopropyl palmitate, ethyl palmitate, 2-ethylhexyl palmitate, isopropyl stearate or isostearate, isostearyl isostearate, octyl stearate, heptanoates, and notably isostearyl heptanoate, alcohol or polyalcohol octanoates, decanoates or ricinoleates, for instance propylene glycol dioctanoate, cetyl octanoate, tridecyl octanoate, 2-ethylhexyl palmitate, alkyl benzoate, hexyl laurate, neopentanoic acid esters, for instance isodecyl neopentanoate, isotridecyl neopentanoate, isostearyl neopentanoate and 2-octyldodecyl neopentanoate, isononanoic acid esters, for instance isononyl isononanoate, isotridecyl isononanoate and octyl isononanoate, oleyl erucate, isocetyl stearate and isostearyl behenate;
[0083] -polyesters obtained by condensation of unsaturated fatty acid dimer and / or trimer and of diol, such as those described in patent application FR0 853634, such as in particular of dilinoleic acid and of1, 4-butanediol. Mention may notably be made in this respect of the polymer sold by Biosynthis under the name Viscoplast (INCI name: Dilinoleic Acid / Butanediol Copolymer) , or else copolymers of polyols and of diacid dimers, and esters thereof, such as Hailuscent
[0084] -aromatic esters and polyesters such as tridecyl trimellitate, C12-C15 alcohol benzoate, the 2-phenylethyl ester of benzoic acid, and butyloctyl salicylate;
[0085] -esters and polyesters of diol dimer and of monocarboxylic or dicarboxylic acid, such as esters of diol dimer and of fatty acid and esters of diol dimer and of dicarboxylic acid dimer, for example of INCI name: Dimer Dilinoleyl Dimer Dilinoleate, such as Lusplan and Lusplan DD- sold by Nippon Fine Chemical and described in application US 2004-175338, the content of which is incorporated into the present application by reference;
[0086] -fatty alcohols containing from 12 to 26 carbon atoms, for instance octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol or oleyl alcohol;
[0087] -synthetic ethers containing from 10 to 40 carbon atoms, such as dicaprylyl ether;
[0088] -dialkyl carbonates, the two alkyl chains possibly being identical or different, such as the dicaprylyl carbonate sold under the name Cetiol by Cognis;
[0089] -and mixtures thereof.
[0090] Nonpolar nonvolatile hydrocarbon-based oils
[0091] The oil may also be chosen from linear or branched, saturated or unsaturated, preferably saturated, nonvolatile nonpolar hydrocarbon-based oils.
[0092] The linear or branched, nonvolatile nonpolar hydrocarbon-based oil (s) are more particularly compounds comprising only carbon and hydrogen atoms (in other words nonvolatile oils of hydrocarbon type) .
[0093] Said linear or branched nonpolar oils may be of mineral or synthetic origin, for instance:
[0094] -liquid paraffin,
[0095] -squalane,
[0096] -isoeicosane,
[0097] -mixtures of saturated, linear hydrocarbons, more particularly C15-C28 hydrocarbons, such as the mixtures whose I NCI names are, for example, the following: C15-C19Alkane (INCI name) , C18-C21Alkane (INCI name) , C21-C28Alkane (INCI name) , for instance the products Gemseal 40, Gemseal 60 and Gemseal 120 sold by Total, Emogreen L19 sold by SEPPIC,
[0098] -hydrogenated or non-hydrogenated polybutenes, for instance the products of the Indopol range sold by INEOS Oligomers,
[0099] -hydrogenated or non-hydrogenated polyisobutenes, for instance the nonvolatile compounds of the range sold by Nippon Oil Fats,
[0100] -hydrogenated or non-hydrogenated polydecenes, for instance the nonvolatile compounds of the range sold by ExxonMobil) ,
[0101] -a nd mixtures thereof.
[0102] Nonvolatile silicone oils
[0103] The nonvolatile oil may also be chosen from phenylated or non-phenylated nonvolatile silicone oils. More particularly, said silicone oils are free of (poly) alkoxylated groups, notably such as (poly) ethoxylated or (poly) propoxylated groups, or (poly) glycerolated groups.
[0104] More particularly, the phenylated or non-phenylated nonvolatile silicone oil is chosen from dimethicones, trimethylpentaphenyltrisiloxanes, tetramethyltetraphenyltrisiloxanes, diphenyl dimethicones, trimethylsiloxyphenyl dimethicones, phenyl trimethicone and diphenylsiloxyphenyl trimethicone, and also mixtures thereof.
[0105] These products are notably sold under the names PH-1555 HRI Cosmetic Fluid (trimethyl pentaphenyl trisiloxane) and Dow Corning 556 Cosmetic Grade Fluid (phenyl trimethicone) by Dow Corning; diphenyl dimethicones such as the products KF-54, KF54HV, KF-50-300CS, KF-53 d and KF-50-100CS or Diphenylsiloxy Phenyl Trimethicone KF56 A sold by Shin-Etsu; the products Belsil PDM 1000 and Belsil PDM 20 sold by Wacker Chemie (trimethylsiloxy phenyl dimethicone) , alone or as mixtures. The values in parentheses represent the viscosities at 25℃ (standard ASTM D-445) . Preferably, the oils used are liquid esters of saturated or unsaturated, linear or branched C1-C26, preferably C10-C20, aliphatic monoacids or polyacids and of saturated or unsaturated, linear or branched C1-C26, preferably C2-C10 aliphatic monoalcohols or polyalcohols, the total number of carbon atoms of the esters being greater than or equal to 10. Preferably, at least one of the alcohol and the acid from which said esters are derived is branched.
[0106] More preferably, the composition according to the present invention comprises at least one oil selected from C2-C10alkyl palmitates.
[0107] Even more preferably, the com position according to the present invention com prises ethylhexyl palmitate.
[0108] Advantageously, the oil is present in the composition according to the present invention in an amount ranging from50wt. %to95wt. %, preferably from 60wt. %to 94wt. %, more preferably from 70wt. %to 93wt. %, relative to the total weight of the composition.
[0109] Cosmetic active ingredients
[0110] Optionally, the composition according to the present invention comprises cosmetic active ingredients.
[0111] For example, the composition may comprise one or more selected from UV protection agents, anti-oxidant agents, skin barrier repairing agent, cosmetic dyes, anti-ageing agents.
[0112] The skilled in the art can select the amount of cosmetic active ingredients based on the final use of the composition according to the present invention.
[0113] Adjuvants
[0114] The composition according to the present invention may also comprise an effective amount of other ingredients, such as fragrances, pH modifiers, chelators, preservatives and so on.
[0115] The skilled in the art can select the amount of the additional adjuvants so as not to adversely impact the final use of the composition according to the present invention.
[0116] According to a preferred embodiment, the present invention provides a composition comprising, relative to the total weight of the composition:
[0117] a) from1.5wt. %to10wt. %of at least one acyl amino acid selected from cocoyl alanine, lauroyl alanine, stearoyl alanine, myristoyl alanine, palmitoyl alanine, oleoyl alanine, and mixtures thereof;
[0118] b) from 3 wt. %to20wt. %of at least one surfactant with at least two saturated fatty chains selected from dialkyl sulfosuccinates with each alkyl containing from 8 to 18 carbon atoms, polyglyceryl diesters of a C8-C18fatty acid, and mixtures thereof; and
[0119] c) from 70wt. %to 93 wt. %of at least one oil selected from C2-C10alkyl palmitates.
[0120] Preferably, the composition according to the present invention is anhydrous.
[0121] As used herein, the term"anhydrous"means that the composition contains less than2wt. %, preferably less than1wt. %, more preferably less than0.5wt. %of water, relative to the total weight of the composition, more preferably contains no water. Where appropriate, the small amounts of water may be provided by ingredients of the composition that contain it in residual amount but are not deliberately provided.
[0122] Preparation and use
[0123] The composition according to the present invention can be prepared by mixing ingredients a) to c) , as essential ingredients, as well as additional ingredient (s) , as explained above, and initiating a solution-to-gel phase transition, for example, by cooling down the composition.
[0124] The method and means to mix the above essential and optional ingredients are not limited. Any conventional method and means can be used to mix the above essential and optional ingredients to prepare the composition according to the present invention.
[0125] The inventors found that the surfactant with at least two saturated fatty chains can prevent the acyl amino acid as defined in the present application from crystallizing into solid particles. The surfactant with at least two saturated fatty chains and the acyl amino acid can co-assemble into stable ordered planar molecular layers encapsulating an oil.
[0126] The composition according to the present invention is in the form of gel.
[0127] According to the second aspect, the present invention provides a non-therapeutic process for caring for keratin materials comprising applying the composition as described above onto the keratin materials.
[0128] EXAMPLES
[0129] The examples that follow are given as non-limiting illustrations of the present invention.
[0130] Main raw materials used, trade names and suppliers thereof are listed in Table1.
[0131] Table1
[0132] Invention Examples 1-2 and Comparative Examples 1-3
[0133] Compositions of invention examples (IE) 1-2 and comparative examples (CE) 1-3 were prepared based on the amounts of components given in Table 2. The amounts are given in%by weight of each component relative to the total weight of each composition.
[0134] Table2
[0135] Compositions of invention examples 1-2 represent compositions according to the present invention.
[0136] Composition of comparative example 1 does not comprise at least one surfactant with at least two saturated fatty chains.
[0137] Composition of comparative example 2 comprises polyglyceryl-6 dioleate instead of at least one surfactant with at least two saturated fatty chains.
[0138] Composition of comparative example 3 comprises polyglyceryl-6 caprylate instead of at least one surfactant with at least two saturated fatty chains.
[0139] Preparation procedure:
[0140] The compositions above were prepared as follows:
[0141] 1. adding lauroyl alanine, selected surfactant (polyglyceryl-6 dicaprate, diethylhexyl sodium sulfosuccinate, polyglyceryl-6 dioleate, or polyglyceryl-6 caprylate) and ethylhexyl palmitate into a beaker with stirring at 75oC for 10 minutes to obtain a homogeneous and clear liquid.
[0142] 2. then cooling down the homogeneous and clear liquid to room temperature (around 25oC) without stirring.
[0143] Evaluation:
[0144] Compositions of invention examples 1-2 and comparative examples 1-3 were evaluated in terms of gelification and stability.
[0145] Gelification
[0146] An inverted tube test was used to evaluate gelification of compositions of invention examples 1-2 and comparative examples 1-3 qualitatively. In this test, a test-tube containing a sample to be evaluated was turned upside-down. Then whether the sample flows under its own weight was observed. It was believed that a gel sample having a yield stress will not flow whereas a viscous but inelastic sol sample will show appreciable flow.
[0147] Stability
[0148] The stability of compositions of invention examples 1-2 and comparative examples 1-3 was evaluated by storing the compositions at room temperature (around25oC) for 1 month. At the end of the storage, the physical appearance (oil leakage or not, color) and odor, phase separation and hardness by hands were checked. If there is no perceptible change in physical appearance, odor and hardness and no phase separation, then the tested composition was considered stable, otherwise the tested composition was considered unstable.
[0149] The results for gelification and stability of compositions of invention examples 1-2 and comparative examples 1-3 were summarized in Table3.
[0150] Table 3
[0151] It can be seen from Table 3 that compositions of invention examples 1-2 are stable gels.
Claims
1.A composition comprising:a) at least one acyl amino acid of formula (I) :wherein,- R1 represents hydrogen, - (CH2) m-NH2, - (CH2) n-COOH, - (CH2) p-OH, or a linear or branched C1-C20 alkyl, m, n and p are independently an integer of 0-10;- R2 represents a linear or branched, saturated or unsaturated hydrocarbon-based group, preferably selected from alkyl or alkenyl;b) at least one surfactant with at least two saturated fatty chains; andc) at least one oil.2.Composition according to claim 1, wherein, in formula (I) ,R1 represents hydrogen, - (CH2) m-NH2, - (CH2) n-COOH, - (CH2) p-OH, a linear C1-C6 alkyl, m, n and p are independently an integer of 1-6, R2 represents a linear or branched C7-C21 alkyl or alkenyl;preferably, R1 represents hydrogen, - (CH2) m-NH2, - (CH2) n-COOH, - (CH2) p-OH, alinear C1-C4 alkyl, m, n and p are independently an integer of 1-4, R2 represents a linear or branched C7-C19 alkyl or alkenyl,more preferably, R1 represents hydrogen, - (CH2) m-NH2, - (CH2) n-COOH, - (CH2) p-OH, alinear C1-C4 alkyl, m, n and p are independently an integer of 2-4, R2 represents a linear or branched C7-C17 alkyl or alkenyl,even more preferably R1 represents hydrogen, - (CH2) 4-NH2, - (CH2) 2-COOH, - (CH2) 4-OH, or-CH3, R2 represents a linear or branched C7-C17 alkyl or alkenyl.3.Composition according to claim 1, whereinin the acyl amino acid is selected from cocoyl alanine, lauroyl alanine, stearoyl alanine, myristoyl alanine, palmitoyl alanine, oleoyl alanine, and mixtures thereof.4.Composition according to any of claims 1-3, wherein the acyl amino acid is present in an amount ranging from 0.1 wt. %to 30 wt. %, preferably from 0.5 wt. %to 25 wt. %, more preferably from 1 wt. %to 20 wt. %, even more preferably from 1.5 wt. %to 15 wt. %, relative to the total weight of the composition.5.Composition according to any of claims 1-4, wherein the surfactant with at least two saturated fatty chains is selected from anionic surfactants, cationic surfactants and non-ionic surfactants, with at least two C5-22 alkyl chains.6.Composition according to any of claims 1-5, wherein the surfactant with at least two saturated fatty chains is selected from dialkyl sulfosuccinates with each alkyl containing from 5 to 22 carbon atoms, (poly) glyceryl diesters of a C5-C22 fatty acid, and mixtures thereof.7.Composition according to any of claims 1-6, wherein the surfactant with at least two saturated fatty chains is selected from dialkyl sulfosuccinates with each alkyl containing from 8 to 18 carbon atoms, polyglyceryl diesters of a C8-C18 fatty acid with 2-10 glycerol units, and mixtures thereof.8.Composition according to any of claims 1-7, wherein the surfactant with at least two saturated fatty chains is selected from sodium diethylhexyl sulfosuccinate, polyglyceryl-6 dicaprate, and mixtures thereof.9.Composition according to any of claims 1-8, wherein the surfactant with at least two saturated fatty chains is present in an amount ranging from 0.1 wt. %to 35 wt. %, preferably from 0.5 wt. %to 30 wt. %, more preferably from 1 wt. %to 25 wt. %, even more preferably from 3 wt. %to 20 wt. %, relative to the total weight of the composition.10.Composition according to any of claims 1-9, wherein the oil is selected from liquid esters of saturated or unsaturated, linear or branched C1-C26, preferably C10-C20, aliphatic monoacids or polyacids and of saturated or unsaturated, linear or branched C1-C26, preferably C2-C10 aliphatic monoalcohols or polyalcohols, the total number of carbon atoms of the esters being greater than or equal to 10.11.Composition according to claim 10, wherein the oil is selected from C2-C10 alkyl palmitates.12.Composition according to any of claims 1-11, wherein the oil is present in an amount ranging from 50 wt. %to 95 wt. %, preferably from 60 wt. %to 94 wt. %, more preferably from 70 wt. %to 93 wt. %, relative to the total weight of the composition.13.Composition according to claim 1, comprising, relative to the total weight of the composition:a) from 1.5 wt. %to 10 wt. %of at least one acyl amino acid selected from cocoyl alanine, lauroyl alanine, stearoyl alanine, myristoyl alanine, palmitoyl alanine, oleoyl alanine, and mixtures thereof;b) from 3 wt. %to 20 wt. %of at least one surfactant with at least two saturated fatty chains selected from dialkyl sulfosuccinates with each alkyl containing from 8 to 18 carbon atoms, polyglyceryl diesters of a C8-C18 fatty acid, and mixtures thereof; andc) from 70 wt. %to 93 wt. %of at least one oil selected from C2-C10 alkyl palmitates.14.Composition according to any of claims 1-13, which is anhydrous.15.A non-therapeutic process for caring for keratin materials comprising applying a composition as defined in any one of claims 1-14 onto said keratin materials.
Citation Information
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