Personal care compositions having visually distinct aqueous and oil phases

Abstract

Disclosed is a multi-phase personal care composition comprising an aqueous phase and an oil phase, the aqueous phase comprising a fatty acid amide and a nonionic surfactant, wherein the weight ratio of the nonionic surfactant to the fatty acid amide is at least 5:1, the aqueous phase being visually distinct from and in physical contact with the oil phase, and the nonionic surfactant being different from the fatty acid amide.

Description

[Technical Field]

[0001] The present invention relates to multi-phase personal care compositions. In particular, the present invention relates to multi-phase personal care compositions comprising an aqueous phase and an oil phase, wherein the weight ratio of nonionic surfactant to fatty acid amide is at least 5:1, the aqueous phase is visually distinct from and in physical contact with the oil phase, and the nonionic surfactant is different from the fatty acid amide. [Background technology]

[0002] Today, personal care compositions with more user involvement are considered more attractive by consumers. A multi-phase personal care composition with rapid in-situ dispersion generation is an excellent example. The product delivered to the consumer is a multi-phase personal care composition with at least two visually distinct phases. Before application, the consumer can manually shake the container for a few seconds to generate a well-dispersed personal care product. The personal care product is then left to recover into a multi-phase personal care composition before the next use. If the interface between at least two phases is not clear and distinct, the personal care composition is much less attractive.

[0003] When the inventors developed a multi-phase personal care composition containing a fatty acid amide, they unexpectedly found that the multi-phase personal care composition with a distinct interface could not be restored after shaking, and this appearance was unattractive to consumers.

[0004] Therefore, there is a need for a method for providing a multi-phase personal care composition containing a fatty acid amide with a distinct interface.Surprisingly, it has been found that by including a nonionic surfactant in a weight ratio of the nonionic surfactant to the fatty acid amide of at least 5:1, a multi-phase personal care composition with a distinct interface after shaking can be achieved. Summary of the Invention [Means for solving the problem]

[0005] In a first aspect, the present invention relates to a multi-phase personal care composition comprising an aqueous phase comprising a fatty acid amide and a nonionic surfactant, and an oil phase, wherein the weight ratio of nonionic surfactant to fatty acid amide is at least 5:1, the aqueous phase is visually distinct from and in physical contact with the oil phase, and the nonionic surfactant comprises a condensation product of a fatty alcohol having from 8 to 22 carbon atoms in either a linear or branched configuration with ethylene oxide, a condensation product of an alkylphenol having a C6 to C15 alkyl group with 5 to 25 moles of ethylene oxide per mole of alkylphenol, a polyoxyethylene sorbitan fatty acid ester, an alkyl glucoside, or a mixture thereof; and wherein the nonionic surfactant is different from the fatty acid amide.

[0006] In a second aspect, the present invention relates to a kit-of-parts comprising a cosmetic container, a multi-phase personal care composition of the present invention, and instructions for use of the kit.

[0007] In a third aspect, the present invention relates to a method of preparing a personal care product, the method comprising manually shaking a cosmetic container containing the multi-phase personal care composition of the present invention.

[0008] All other aspects of the present invention will become more readily apparent in view of the following detailed description and examples. DETAILED DESCRIPTION OF THE INVENTION

[0009] Except in the examples, or unless expressly indicated otherwise, all numbers in this specification expressing quantities of ingredients or conditions of reactions, physical properties of materials and / or uses may be understood to be modified by the word "about."

[0010] All amounts are by weight of the composition unless otherwise specified.

[0011] It should be noted that in specifying a range of values, any particular upper value can be associated with any particular lower value.

[0012] For the avoidance of doubt, the word "comprising" is intended to mean "including" but not necessarily "consisting of" or "composed of." In other words, the listed steps or options need not be exhaustive.

[0013] The disclosure of the invention found herein should be considered to cover all embodiments found in the claims as variously dependent on one another, regardless of the fact that the claims may be found without multiple dependencies or redundancies.

[0014] Where features are disclosed with respect to particular embodiments of the invention (e.g., compositions of the invention), such disclosure should also be deemed to apply mutatis mutandis to any other embodiment of the invention (e.g., methods of the invention).

[0015] As used herein, "visually distinct" means that the areas occupied by each phase appear to the human eye as distinct, separate areas in contact with each other (i.e., they are not an emulsion or dispersion of particles less than 100 microns).

[0016] As used herein, "multiphase" refers to at least two phases that occupy separate and distinct physical spaces within the container in which they are stored, but are in direct contact with each other (i.e., they are not separated by a barrier).

[0017] As used herein, "transparent" refers to at least 70%, preferably at least 80%, and more preferably at least 85% of light having a wavelength of 550 nm being transmitted through a 1 cm thick sample as measured by a UV-vis spectrometer (e.g., Perkin-Elmer Lambda 650S) at 25° C. "Opaque" as used herein refers to no more than 50%, preferably no more than 30%, of light being transmitted by the same method.

[0018] Preferably, the fatty acid amide contains at least 6 carbon atoms. Since longer-chain fatty acid amides are more beneficial for skin conditioning, suitable fatty acids preferably contain 8 to 24 carbon atoms, preferably 12 to 20 carbon atoms, and most preferably 12 to 18 carbon atoms. Because essential fatty acids provide nutrition to the skin, the most preferred embodiment of the present invention uses amides of essential fatty acids. Examples of essential fatty acids include, but are not limited to, linoleic acid, linolenic acid, arachidonic acid, gamma-linolenic acid, homo-gamma-linolenic acid, and mixtures thereof. Linoleic acid is most preferred because it is also a precursor to ceramides. Amides suitable for use in the present invention can be simple amides (i.e., those containing a -CONH group), N-alkylamides, N,N-dialkylamides, mono-alkanolamides, and di-alkanolamides. Suitable alkyl or alkanol groups contain 1 to 30 carbon atoms, preferably 1 to 20 carbon atoms, and most preferably 1 to 8 carbon atoms. Preferred amides included in the present invention are the mono- and di-alkanolamides, particularly of essential fatty acids. Alkanolamides are more commonly available than alkylamides.

[0019] Preferably, the fatty acid amide is a fatty alkanolamide (fatty acid alkanolamide), more preferably a C8-C 20The fatty acid amide is a C1-C8 alkanolamide. Preferred fatty acid amides are selected from mono- and diethanolamides of linoleic acid, palmitic acid, and coconut oil. More preferably, the fatty acid amide comprises cocamide MEA, cocamide DEA, lauramide DEA, stearamide MEA, myristamide DEA, stearamide DEA, oleylamide DEA, tallowamide DEA, tallowamide MEA, isostearamide DEA, isostearamide MEA, or a mixture thereof. Even more preferably, the fatty acid amide comprises cocamide MEA, and most preferably, the fatty acid amide is cocamide MEA.

[0020] The fatty acid amide is included in the composition of the present invention in an amount ranging from 0.0001% to 10% by weight, preferably from 0.01% to 4% by weight, and most preferably from 0.1% to 1% by weight of the total composition.

[0021] Preferably, the nonionic surfactant has an HLB value of 10 to 18, more preferably 12 to 16. The hydrophilic-lipophilic balance (HLB) is a measure of the degree of hydrophilicity or lipophilicity. It can be determined experimentally by Marszall's phenol titration method; Parfumerie, Kosmetik, Vol. 60, 1979, pp. 444-448; and Rompp, Chemistry Lexicon, 8th Edition, 1983, p. 1750.

[0022] Nonionic surfactants include: a) condensation products of aliphatic alcohols having 8 to 22 carbon atoms in either a linear or branched configuration with ethylene oxide, such as coconut alcohol / ethylene oxide condensates having 2 to 15 moles of ethylene oxide per mole of coconut alcohol; b) condensates of alkylphenols having C6 to C15 alkyl groups with 5 to 25 moles of ethylene oxide per mole of alkylphenol; c) polyoxyethylene sorbitan fatty acid esters, such as polyoxyethylene sorbitan C 6~24 d) fatty acid esters; d) alkyl glucosides, or mixtures thereof.

[0023] Preferably, the nonionic surfactant comprises a polyoxyethylene sorbitan fatty acid ester, an alkyl glucoside, or a mixture thereof, and more preferably, the nonionic surfactant comprises a C6-C 20 Alkyl glucoside, polyoxyethylene sorbitan C 6~24 and even more preferably, the nonionic surfactant comprises a C6-C fatty acid ester or a mixture thereof. 20 The nonionic surfactant comprises an alkyl glucoside, and even more preferably, the nonionic surfactant comprises a nonionic surfactant having the INCI (International Nomenclature of Cosmetic Ingredients) name caprylyl / capryl glucoside, and most preferably, the nonionic surfactant is caprylyl / capryl glucoside. As used herein, alkyl glucoside includes alkyl polyglucosides.

[0024] A preferred alkyl glucoside is RO-(G) n wherein R is a branched or linear alkyl group which may be saturated or unsaturated, G is a saccharide group, and the degree of polymerization, n, may have a value of 1 to 10; preferably, R is a C5 to C 20 wherein G is selected from C5 or C6 monosaccharide residues and n has a value of 1 to 6; more preferably, R is C6 to C 16 wherein G is glucose and n has a value of 1 to 6. Even more preferably, R is C6 to C 16 where G is glucose and n has a value of 1 to 6.

[0025] Preferred polyoxyethylene sorbitan fatty acid esters include polyoxyethylene sorbitan C 6~24 Fatty acid esters, more preferably polyoxyethylene sorbitan C 10~20 More preferably, the polyoxyethylene sorbitan fatty acid ester comprises polysorbate 20, polysorbate 80, or a mixture thereof.

[0026] Preferably, the amount of nonionic surfactant is from 0.0001 to 15% by weight of the composition, more preferably from 0.001 to 10% by weight, even more preferably from 0.01 to 6% by weight, even more preferably from 0.1 to 5% by weight, and most preferably from 1 to 4% by weight.

[0027] The weight ratio of nonionic surfactant to fatty acid amide is preferably 5:1 to 50:1, more preferably 5:1 to 20:1, even more preferably 5:1 to 8:1, and even more preferably 5:1 to 7:1.

[0028] Preferably, the composition comprises a retinoid. Typically, the retinoid is selected from retinyl ester, retinol, retinal, retinoic acid or a mixture thereof. More preferably, the retinoid comprises retinol, retinyl ester or a mixture thereof, and even more preferably, the retinoid is selected from retinol, retinyl ester or a mixture thereof.

[0029] The term "retinol" includes the following isomers of retinol: all-trans-retinol, 13-cis-retinol, 11-cis-retinol, 9-cis-retinol, 3,4-didehydro-retinol, 3,4-didehydro-13-cis-retinol; 3,4-didehydro-11-cis-retinol; 3,4-didehydro-9-cis-retinol. Preferred isomers are all-trans-retinol, 13-cis-retinol, 3,4-didehydro-retinol, and 9-cis-retinol. The most preferred retinol is all-trans-retinol due to its wide commercial availability. Retinyl esters are esters of retinol. The term "retinol" is defined above. Retinyl esters suitable for use in the present invention are preferably C1-C6 isomers of retinol. 30 Esters, preferably C2-C of retinol 20 Esters, most preferably C2, C3, and C of retinol 16The retinyl ester is preferably selected from retinyl palmitate, retinyl acetate, retinyl linoleate, retinyl oleate, retinyl propionate, or a mixture thereof. More preferably, the retinyl ester is selected from retinyl palmitate, retinyl acetate, retinyl propionate, or a mixture thereof. Most preferably, the retinyl ester is selected from retinyl palmitate, retinyl propionate, or a mixture thereof.

[0030] Particularly preferred retinoids are selected from all-trans-retinol, retinyl palmitate, retinyl acetate, retinyl propionate, or mixtures thereof. Most preferably, the retinoid is selected from retinyl palmitate, retinyl propionate, or mixtures thereof.

[0031] Preferably, the retinoid is used in the composition in an amount of from 0.0001% to 8% by weight of the composition, more preferably from 0.0005% to 3% by weight of the composition, even more preferably from 0.1 to 1% by weight, and most preferably from 0.2% to 0.8% by weight.

[0032] The composition may contain a resorcinol derivative. The resorcinol derivative preferably refers to a resorcinol ring structure and / or at least one hydrogen atom on the hydroxyl group thereof being replaced with an alkyl group or a phenylalkyl group. Preferably, the resorcinol derivative is a 4-substituted resorcinol. Preferably, the resorcinol derivative is selected from 4-ethylresorcinol, 4-butylresorcinol, 4-hexylresorcinol, phenylethylresorcinol, or a mixture thereof, and more preferably, the resorcinol derivative includes 4-hexylresorcinol.

[0033] The amount of the resorcinol derivative is preferably in the range of 0.00001 to 10% by weight, more preferably 0.001 to 5% by weight, and most preferably 0.1 to 0.6% by weight of the total amount of the composition.

[0034] Preferably, the composition comprises a triglyceride. More preferably, the composition comprises caprylic / capric triglyceride, coconut oil, sunflower seed oil, safflower oil, cottonseed oil, olive oil, or a mixture thereof. A particularly preferred triglyceride is caprylic / capric triglyceride. Preferably, the amount of triglyceride is 0.001 to 12% by weight of the composition, more preferably 0.1 to 8% by weight, and even more preferably 0.5 to 5% by weight.

[0035] Preferably, the composition comprises a fatty acid ester. As used herein, fatty ester refers to an ester having a linear chain length of at least 6 carbon atoms, preferably at least 8 carbon atoms. Preferably, the fatty ester is liquid at 25°C and atmospheric pressure. Preferably, the fatty ester is an ester of a carboxylic acid having 1 to 22 carbon atoms and an alcohol having 1 to 20 carbon atoms. Preferably, the carboxylic acid has 2 to 20 carbon atoms, more preferably 6 to 18 carbon atoms, and even more preferably 10 to 16 carbon atoms. Preferably, the alcohol has 2 to 18 carbon atoms, more preferably 3 to 15 carbon atoms.

[0036] Preferably, the fatty acid ester is selected from myristyl propionate, cetyl acetate, cetyl propionate, isodecyl neopentanoate, isopropyl myristate, isopropyl palmitate, isopropyl laurate, methyl laurate, methyl linoleate, methyl myristate, methyl stearate, methyl palmitate, isopropyl isostearate, butyl stearate, isobutyl palmitate, butyl myristate, ethyl palmitate, ethyl myristate, isobutyl stearate, isobutyl myristate, or a mixture thereof. Even more preferably, the fatty acid ester comprises myristyl propionate, cetyl propionate, isodecyl neopentanoate, isopropyl myristate, isopropyl palmitate, methyl myristate, methyl stearate, or a mixture thereof. Most preferably, the fatty acid ester is isopropyl myristate.

[0037] The amount of fatty acid ester is preferably in the range of 3 to 60% by weight, more preferably 8 to 55% by weight, even more preferably 15 to 50% by weight, even more preferably 25 to 45% by weight, and most preferably 28 to 42% by weight of the total weight of the composition.

[0038] In order to improve the feel of the composition, it is preferred that the composition further comprises a volatile oil.The term "volatile oil" is understood to mean an oil that can evaporate on contact with the skin in less than one hour at 25°C and atmospheric pressure.Volatile oils are volatile liquid cosmetic oils that have a non-zero vapor pressure, particularly at 25°C and atmospheric pressure, in particular a vapor pressure in the range of 0.13 Pa to 40,000 Pa, preferably in the range of 1.3 Pa to 1,300 Pa.

[0039] Preferred volatile oils are C8-C 16 The composition contains an isoalkane, a volatile silicone oil having 2 to 7 silicon atoms, and more preferably contains isododecane, isodecane, isohexadecane, a volatile dimethicone, cyclopentasiloxane, cyclohexasiloxane, or a mixture thereof. Even more preferably, the composition contains isododecane, isodecane, isohexadecane, cyclopentasiloxane, cyclohexasiloxane, or a mixture thereof, and most preferably, the composition contains isohexadecane.

[0040] Preferably, the composition contains a polyhydric alcohol. The polyhydric alcohol may be selected from the group consisting of propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1,3-butylene glycol, isoprene glycol, ethoxylated glycerol, propoxylated glycerol, or mixtures thereof. The most preferred polyhydric alcohol is glycerol, also known as glycerin. The amount of polyhydric alcohol may range from 5 to 35% by weight of the composition, preferably from 8 to 25% by weight, and more preferably between 12 and 18% by weight.

[0041] The composition may comprise water in an amount of from 10 to 90% by weight of the composition, more preferably from 15 to 78% by weight of the composition, even more preferably from 20 to 65% by weight, and most preferably from 25% to 50% by weight.

[0042] The composition may contain optional ingredients including moisturizers, whitening agents, preservatives, antioxidants, colorants, fragrances, or combinations thereof.

[0043] Vitamin B3 compounds (including derivatives of vitamin B3), such as niacin, nicotinic acid or niacinamide, are preferred skin lightening agents according to the present invention, most preferably niacinamide.

[0044] Preferably, the composition is a two-phase composition. Preferably, both the aqueous phase and the oily phase are transparent. Preferably, the weight ratio of the aqueous phase to the oily phase is in the range of 1:8 to 8:1, more preferably 1:4 to 4:1, and even more preferably 1:2 to 2:1.

[0045] The multi-phase personal care composition can be provided to the consumer in any suitable manner, but it is preferred that the composition be provided in a cosmetic container, which preferably has a volume of 2 to 250 mL, more preferably 5 to 100 mL, even more preferably 8 to 60 mL, and even more preferably 10 to 50 mL.

[0046] Preferably, the kit of parts comprises a cosmetic container, a multi-phase personal care composition according to the present invention, and instructions for use of the kit. Preferably, the instructions include a step of mixing the aqueous phase with the oil phase by any suitable method, for example, by shaking the container by hand for at least 1 second, preferably 2 seconds to 5 minutes, more preferably 3 seconds to 1 minute. This results in the formation of a homogeneous personal care product. Preferably, the personal care product is opaque.

[0047] Preferably, the multi-phase personal care composition can be formed into a personal care product by manually shaking the cosmetic container, preferably for 1 second to 5 minutes, more preferably for 1 second to 1 minute. Preferably, the personal care product can be reconstituted into a multi-phase personal care composition by allowing it to stand for 3 minutes to 20 hours, more preferably for 10 minutes to 7 hours, and even more preferably for 15 minutes to 4 hours.

[0048] Preferably, the personal care composition (product) is a skin care composition (product).Skin care composition (product) refers to a composition (product) suitable for topical application to human skin, and is preferably a leave-on product.The term "leave-on" used in relation to compositions herein means a composition that is applied to skin or rubbed onto skin and remains on skin.The term "skin" used herein includes the skin of the face (excluding eyelids and lips), neck, chest, abdomen, back, arms, armpits, hands and legs.Preferably, "skin" includes the skin of the face (excluding eyelids and lips) and armpits, and more preferably, skin means the skin of the face except for lips and eyelids.

[0049] The following examples are provided to facilitate understanding of the invention and are not intended to limit the scope of the claims.

[0050] [Example] [Example 1] This example demonstrates the effect of the weight ratio of surfactant to fatty acid amide on the formation of a multi-phase skin care composition. [Table 1]

[0051] The samples in Table 1 were prepared by mixing cocamide MEA at a temperature of 50-60°C, cooling to room temperature, and adding the other ingredients to obtain an aqueous phase. The oil phase was obtained by mixing the oil phase ingredients together. The samples were obtained by mixing the aqueous phase and oil phase.

[0052] Each sample was then packaged in three identical transparent bottles of equal volume. All bottles were simultaneously shaken by hand for 15 seconds. Five uniformly dispersed skin care products were formed. These were then allowed to settle and recover to a multi-phase state. The time required for each sample to recover to a multi-phase state is recorded in the last row of Table 1.

[0053] After all samples were recovered in a multiphase state, their appearance was visually inspected. It was found that aggregates were present at the interface between the water and oil phases in Samples A and B. In contrast, for Samples 1-3, a surprisingly distinct interfacial region was observed. This demonstrated that multiphase compositions provide distinct phase boundaries when the weight ratio of caprylyl / capryl glucoside to cocamide MEA is at least 5:1.

[0054] [Example 2] This example demonstrates the effect of surfactant type on the formation of a multi-phase skin care composition. [Table 2]

[0055] All samples were prepared according to the same procedure as described in Example 1. Each sample was then packaged in three identical clear bottles of equal volume. All bottles were simultaneously shaken by hand for 15 seconds. Five uniformly dispersed skin care products were formed. These were allowed to rest overnight (approximately 15 hours) to recover to a multi-phase state. Sample C was observed to be mostly a white emulsion with the naked eye, indicating that it could not recover to a multi-phase state. In contrast, Samples 4-7 recovered to a clear two-phase composition in approximately 4 hours.

Claims

1. (a) an aqueous phase comprising a fatty acid amide and a nonionic surfactant; (b) an oil phase; 1. A multi-phase personal care composition comprising: (i) the weight ratio of said nonionic surfactant to said fatty acid amide is at least 5:1; (ii) the aqueous phase is visually distinct from and in physical contact with the oil phase; (iii) the nonionic surfactant comprises a condensation product of an aliphatic alcohol having from 8 to 22 carbon atoms in either a linear or branched configuration with ethylene oxide, a condensation product of an alkylphenol having a C6 to C15 alkyl group with from 5 to 25 moles of ethylene oxide per mole of alkylphenol, a polyoxyethylene sorbitan fatty acid ester, an alkyl glucoside, or a mixture thereof; (iv) the nonionic surfactant is different from the fatty acid amide; (v) the fatty acid amide is a C8-C20 fatty acid C1-C8 alkanolamide; Multi-phase personal care compositions.

2. The composition of claim 1, wherein the fatty acid amide is selected from the mono- and diethanolamides of linoleic acid, palmitic acid, and coconut oil.

3. The composition described in claim 1, wherein the fatty acid amide comprises cocamide MEA.

4. 4. The composition according to any one of claims 1 to 3, wherein the fatty acid amide is present in an amount of from 0.0001% to 10% by weight of the total amount of the composition.

5. The composition described in claim 4, wherein the fatty acid amide is present in an amount of 0.1% to 1% by weight of the total amount of the composition.

6. 6. The composition of claim 1, wherein the nonionic surfactant comprises an alkyl glucoside, a polyoxyethylene sorbitan fatty acid ester, or a mixture thereof.

7. The composition of claim 6, wherein the nonionic surfactant comprises a C 6 -C 20 alkyl glucoside, a polyoxyethylene sorbitan C 6-24 fatty acid ester, or a mixture thereof.

8. A composition according to any preceding claim, wherein the non-ionic surfactant is present in an amount of from 0.1 to 5% by weight of the composition.

9. A composition according to any one of claims 1 to 8, wherein the weight ratio of the nonionic surfactant to the fatty acid amide is in the range of 5:1 to 50:

1.

10. A composition described in any one of claims 1 to 9, comprising a retinoid.

11. The composition of claim 10, wherein the retinoid is present in an amount of 0.00001 to 10% by weight of the total composition.

12. 12. The composition of claim 1, wherein both the aqueous and oil phases are clear.

13. 13. The composition of any one of claims 1 to 12, wherein the weight ratio of the aqueous phase to the oily phase is in the range of 1:2 to 2:

1.

14. A kit-of-parts comprising a cosmetic container, the multi-phase personal care composition of any one of claims 1 to 13, and instructions for use of the kit.

15. 14. A method for preparing a personal care product, comprising the step of manually shaking a cosmetic container containing the composition of any one of claims 1 to 13.

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