KR20070106810A - Skin care composition comprising skin lightening agent - Google Patents

Abstract

(1) a safe and effective amount of a skin lightening agent;(2) a viscosifying agent that provides a viscosity of from about 1,000mPas to about 1,000,000mPas comprising:(a) a carboxylic acid/carboxylate copolymer; and (b) a cellulose derivative polymer; (3) from about 0.1% to about30% of a humectant selected from the group consisting of butylene glycol, pentylene glycol, and mixtures thereof; and (4) an aqueous carrier; wherein the composition is substantially free of surfactants.

Description

Skin care composition containing skin whitening agent {SKIN CARE COMPOSITION COMPRISING SKIN LIGHTENING AGENT}

The present invention relates to an aqueous composition comprising a skin lightening agent. Aqueous compositions provide improved penetration into the skin without compromising the skin feel. Aqueous compositions are particularly useful for use with ultrasonic application devices.

Many personal care products currently available to consumers are primarily directed to improving the health and / or physical appearance of the skin. Many of these skin care products include hyperpigmentation of skin (mushrooms, freckles, spots, darkening, uneven tones, etc.), wrinkles, and other long-term changes typically associated with skin aging or environmental damage to human skin. It is about delaying, minimizing or even eliminating.

Skin is generally treated with a moisturizer to keep the skin healthy and / or young. Skin lightening agents may also be used. Transparent forms of gel, lotion and emulsion compositions are appealing to consumers because there is a belief that the application of such compositions will make their skin appear transparent and young. Cosmetic ingredients that can have a transparent appearance are disclosed in Japanese Patent Application Laid-Open Nos. 10-298029, 10-298028, 10-338619, 9-301852, 10-194922, 10-287524, 11-269058, 2001-106621; And PCT publications WO 99/49841, 00/37029, 00/61098, 00/61083, 02/58665, 02/92046 and the like.

If these products can provide an effective skin whitening effect and also provide a pleasant feeling to the skin when the product is rubbed into the skin or palms and applied to the face and other parts of the body, it will be much more appealing to consumers. Could be.

Based on the foregoing, there is a need for a transparent or translucent skin care composition that provides improved permeability of the skin lightening actives while providing smoothness and moisturizing to the skin without leaving a sticky skin feel. There is also a need for skin care compositions that can deliver ultrasound to the skin more effectively and when used with an ultrasonic application device.

None of the existing techniques provide all the advantages and effects of the present invention.

Summary of the Invention

The present invention relates to a skin care composition, which

(1) with a safe and effective amount of skin lightener;

(2) a viscous agent that provides a viscosity from about 1,000 mPas to about 1,000,000 mPas, wherein the viscosifier comprises (a) a carboxylic acid / carboxylate copolymer, and (b) a cellulose derivative copolymer; and ;

(3) from about 0.1% to about 30% of a wetting agent selected from the group consisting of butylene glycol, pentylene glycol and mixtures thereof; And

(4) comprises a water soluble carrier;

The composition is substantially free of surfactants.

These and other features, aspects, and advantages of the present invention will become apparent to those skilled in the art upon reading the disclosure of the present invention, including the appended claims.

Detailed description of the invention

While this specification concludes with the claims that specifically point out and specifically claim the invention, it is believed that the invention will be better understood from the following detailed description.

All cited references are incorporated herein by reference in their entirety. No citation of any document is to be taken as an adjudication of any usefulness as prior art to the claimed invention.

"Including" in this specification means that other elements may be added that do not affect the final result. This term includes the terms “consisting of” and “consisting essentially of”.

All percentages, parts and ratios are based on the total weight of the compositions of the present invention unless otherwise specified. All weights associated with the listed ingredients are based on activity level and therefore do not include carriers or by-products that may be included in commercially available materials.

All ingredients, such as other ingredients and active agents, useful in the present invention may be classified or described by their cosmetic and / or therapeutic effect or their desired mode of operation. However, it should be understood that other ingredients or active agents useful in the present invention may in some cases provide more than one cosmetic and / or therapeutic effect or operate with more than one mode of action. Therefore, classifications herein are made for convenience and are not intended to limit the ingredients to the applications specifically mentioned or listed applications.

Skin whitening agent

The composition of the present invention comprises a safe and effective amount of skin lightening agent. The skin lightening agents useful in the present invention refer to active ingredients that improve hyperpigmentation as compared to prior to treatment. Skin lighteners are preferably included at a level of from about 0.001% to about 10%, more preferably from about 0.1% to about 5% by weight of the liquid composition.

Skin whitening agents useful in the present invention include ascorbic acid compounds, vitamin B ₃ compounds, azelaic acid, butyl hydroxyanisole, molar acids and derivatives thereof, glycyrrhizin acid, hydroquinone, kojic acid, arbutin, mulberry extract and mixtures thereof. Include. The type and amount of skin lightening agent is chosen such that the inclusion of certain agents does not affect the stability of the present compositions. For example, water soluble agents are preferred in terms of compositional stability and may also be contained to the extent that the water-insoluble agent can be dispersed with the carboxylic acid / carboxylate copolymer and / or the optional lower alkyl alcohol carrier, and thus the present invention. It does not affect the stability of the composition. The term "water soluble" in connection with the skin whitening agent of the present invention relates to a compound which dissolves completely so that a clear solution is made when dissolved in a sufficient amount of water at ambient temperature.

The use of a combination of skin lightening agents is believed to be beneficial in that they may provide a skin lightening effect through various mechanisms. Preferably, the skin lightening agent comprises a water-soluble skin lightening agent selected from ascorbic acid compounds, vitamin B ₃ compounds, azelaic acid, molar acids and derivatives thereof, hydroquinone, kojic acid, arbutin, audi extracts and mixtures thereof. In one preferred embodiment, a combination of ascorbic acid compound and vitamin B ₃ compound is used.

Ascorbic acid compounds useful in the present invention include ascorbic acid itself, ascorbic acid salts and derivatives thereof in the L-form. Ascorbic acid salts useful in the present invention include sodium, potassium, lithium, calcium, magnesium, barium, ammonium and protamine salts. Ascorbic acid derivatives useful in the present invention include, for example, esters of ascorbic acid and ester salts of ascorbic acid. Particularly preferred ascorbic acid compounds are esters of ascorbic acid and glucose and 2-o-D-glucopyranosyl-L-ascorbic acid and metal salts thereof, commonly referred to as L-ascorbic acid 2-glucoside or ascorbyl glucoside, and sodium ascorbic acid. L-ascorbic acid phosphate ester salts such as corbyl phosphate, potassium ascorbyl phosphate, magnesium ascorbyl phosphate and calcium ascorbyl phosphate. Commercially available ascorbic compounds are available from magnesium ascorbyl phosphate, 2-oD-glucopyranosyl-L-ascorbic acid and Roche available from Hayashibara, available from Showa Denko. Sodium L-ascorbyl phosphate under the trade name STAY C.

Vitamin B ₃ compounds useful in the present invention include, for example, those having the formula:

Here, R is -CONH ₂ (e.g., niacinamide) or -CH ₂ OH (e.g., Nikko ethynyl alcohol); Derivatives thereof; And salts thereof. Exemplary derivatives of the aforementioned vitamin B ₃ compounds include nicotinic acid esters, nicotinyl amino acids, nicotinyl alcohol esters of carboxylic acids, nicotinic acid N-oxides and niacinamide N-oxides, including nonvascular dilatable esters of nicotinic acid. . Preferred vitamin B ₃ compounds are niacinamide and tocopherol nicotinate, more preferably niacinamide. In one preferred embodiment, the vitamin B ₃ compound contains a limited amount of salt form and more preferably is substantially free of salts of the vitamin B ₃ compound. Preferably the vitamin B ₃ compound contains less than about 50% of such salts and more preferably is essentially free of salt form. Very useful and commercially available vitamin B ₃ compounds in the present invention include niacinamide USP available from Reilly.

Viscous agent

The composition of the present invention contains a viscosifier that provides the composition with a viscosity of about 1,000 mPas to about 1,000,000 mPas, preferably about 3,000 mPas to about 100,000 mPas. Polymers useful for providing the viscosity agent in the present invention are water-soluble or water-miscible polymers. The term "water-soluble or water-miscible" in connection with the viscosity agent herein refers to a compound which dissolves so that a clear solution is made when dissolved in a sufficient amount of water with or without the aid of elevated temperature and / or mixing. This viscosity agent includes carboxylic acid / carboxylate copolymers and cellulose derivative polymers. Combinations of such polymers are believed to provide compositions that are transparent or translucent while providing smoothness and moisturizing to the skin without leaving a tacky skin feel. Other polymers compatible with carboxylic acid / carboxylate copolymers and cellulose derivative polymers may also be contained. In one preferred embodiment, the viscous agent is made substantially only of the carboxylic acid / carboxylate copolymer and the cellulose derivative polymer.

Carboxylic Acid / carboxylate Copolymer

The composition of the present invention comprises a carboxylic acid / carboxylate copolymer. Carboxylic acid / carboxylate copolymers maintain the composition relatively transparent and at a suitable viscosity without making the composition sticky or slippery in use. Without being limited by theory, it is believed that carboxylic acid / carboxylate copolymers also provide shear thinning properties to the compositions of the present invention. Shear thinning properties mean that there is a yield point within the typical shear stresses applicable by hand on the skin and that the viscosity of the composition above the yield point is significantly reduced to the consumer's perception.

In addition, the carboxylic acid / carboxylate copolymers can disperse and stabilize water-insoluble components, such as water-insoluble skin lightening agents, in the composition of the present invention when such components are contained.

The carboxylic acid / carboxylate copolymer in the present invention is a hydrophobically modified crosslinked copolymer of carboxylic acid and alkyl carboxylate and has amphipathicity. These carboxylic acid / carboxylate copolymers are 1) carboxylic acid monomers such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, fumaric acid, crotonic acid, or -chloroacrylic acid, 2) alkyl Obtained by copolymerization of a carboxylic acid ester having 1 to about 30 carbons in a chain, and preferably 3) a crosslinking agent of the formula:

, 또는

이고, R⁵³은 수소 또는 약 1 내지 약 30개의 탄소를 갖는 알킬기이며; Y²는 (CH₂)_m", (CH₂CH₂O)_m", 또는 (CH₂CH₂CH₂O)_m"로부터 선택되고, m"은 1 내지 약 30의 정수이다. 공중합체 중에 포함된 알킬기 때문에 카르복실산/카르복실레이트 공중합체는 조성물을 바람직하지 못하게 끈적이게 만들지는 못한다고 생각된다.Wherein R ⁵² is hydrogen or an alkyl group having from about 1 to about 30 carbons; Y ¹ is independently oxygen, CH ₂ O, COO, OCO,

, or

R ⁵³ is hydrogen or an alkyl group having from about 1 to about 30 carbons; Y ² is selected from (CH ₂ ) _{m ″,} (CH ₂ CH ₂ O) _{m ″,} or (CH ₂ CH ₂ CH ₂ O) _{m ″} , and m ″ is an integer from 1 to about 30. It is believed that carboxylic acid / carboxylate copolymers do not make the composition undesirably sticky because of the alkyl groups contained in the copolymer.

Carboxylic acid / carboxylate copolymers suitable for the present invention are acrylic acid / alkyl acrylate copolymers having the formula:

Wherein R ⁵¹ is independently hydrogen or alkyl having 1 to 30 carbon atoms and at least one of R ⁵¹ is hydrogen, R ⁵² is as defined above, n, n ', m and m' are n + n ' + m + m 'is an integer from about 40 to about 100, n "is an integer from 1 to about 30, and l is defined such that the molecular weight of the copolymer is from about 500,000 to about 3,000,000.

Useful and commercially available carboxylic acid / carboxylate copolymers in the present invention include the CTFA name acrylate / C10-30 alkyl acrylate crosslinked polymers with the trade names Pemulen TR-1, Pemulen TR-2, Carbo Carbopol 1342, Carbopol 1382, and Carbopol ETD 2020, all of which are listed in B.F. Available from B. F. Goodrich Company.

Neutralizing agents may also be included for neutralizing the carboxylic acid / carboxylate copolymers of the present invention. Non-limiting examples of such neutralizers include sodium hydroxide, potassium hydroxide, ammonium hydroxide, monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, aminomethylpropanol, tromethamine, tetrahydroxypropyl ethylenediamine and their Mixtures.

Cellulose derivative polymer

The composition of the present invention comprises a cellulose derivative polymer. Without being limited by theory, adjusting the amount of cellulose derivative polymer in the present compositions provides improved moisturization and smoothness to the skin without giving an undesirable sticky or sticky feel.

Cellulose derivative polymers useful in the present invention include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxyethyl ethyl cellulose, hydroxypropyl methyl cellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder and their Mixtures. Especially preferred are hydroxyethyl cellulose carboxymethylcellulose, and mixtures thereof. Very useful and commercially available compounds in the present invention include hydroxyethyl cellulose under the trade name Natrosol Hydroxyethylcellulose, and carboxymethyl cellulose under the trade name Aqualon Cellulose Gum. Both are available from Aqualon.

Humectant

The composition of the present invention is about 0.1% to about 30%, preferably selected from the group consisting of butylene glycol (1,3 butanediol), pentylene glycol (1,2-pentanediol), and mixtures thereof Preferably from about 0.1% to about 10% humectant. Such humectants provide a moisturizing effect to the skin without significantly worsening the permeability of the skin lightening agents of the present invention. Commercially available butylene glycol materials include 1,3-butylene glycols available from Celanese. Commercially available pentylene glycol materials include Hydrolite-5, available from Dragoco.

Aqueous carrier

Compositions of the present invention are suitably called gels and contain an aqueous carrier to provide a transparent or translucent composition. The composition of the present invention does not have a unique discontinuous phase and is neither an emulsion nor a liquid crystal. The present invention is substantially free of surfactants. When a water insoluble component is contained in the present invention, such component is maintained in an amount soluble / dispersible, for example, by carboxylic acid / carboxylate copolymer or lower alkyl alcohol.

The concentration and species of this carrier are chosen according to their compatibility with other ingredients and other desired properties of the product. Carriers useful in the present invention include water and aqueous solutions of lower alkyl alcohols. Lower alkyl alcohols useful in the present invention are monohydric alcohols having 1 to 6 carbon atoms, more preferably ethanol and isopropanol. Preferably the composition of the present invention contains at least about 70% water. Deionized water is preferably used. Depending on the desired product properties, natural water containing mineral cations may also be used.

The pH of the composition of the present invention is selected in consideration of the activity and stability of the skin lightening agent and the desired properties of the product. In a preferred embodiment the pH is preferably from about 5 to about 8 when the skin lightening agent comprises a combination of ascorbic acid compound and vitamin B ₃ compound. Buffers and other pH adjusters may be included to achieve the desired pH.

Surfactant-free

The compositions of the present invention are substantially free of surfactants. Preferably less than about 1% of the surfactant is present, more preferably less than about 0.5% of the surfactant is present and even more preferably no surfactant is intentionally added to the composition. By surfactant is meant herein any compound that greatly reduces surface tension when added to a composition and forms micelles or reverse micelles at concentrations above the critical micelle concentration. Anionic, amphoteric, zwitterionic, nonionic, and cationic surfactants that provide cleansing and foaming upon application to the skin are included in the present invention.

Anionic surfactants of the invention include ethoxylated alkyl sulfates, alkyl ethoxy carboxylates, alkyl glyceryl ether sulfonates, acyl sarcosinates, alkyl ethoxysulfosuccinates, alpha sulfonated fatty acids, salts thereof and / or Esters thereof, ethoxylated alkyl phosphate esters, ethoxylated alkyl glyceryl ether sulfonates, paraffin sulfonates and alkoxy amide sulfonates, alkyl sulfates and mixtures thereof.

The amphoteric surfactants of the present invention are coco ampocarboxypropionate, coco ampocarboxy propionic acid, coco ampoacetate, coco ampodiacetate (also called coco ampocarboxyglycinate), sodium lauro ampoacetate (alternatively Sodium lauroampocarboxyglycinate).

Zwitterionic surfactants of the invention include alkyl betaines and amido betaines.

The nonionic surfactants of the present invention include not only cleaning and foaming but also nonionic surfactants mainly providing emulsifying effects. Such nonionic surfactants are condensation products of alkylene oxides with fatty acids, for example alkylene oxide esters of fatty acids, condensation products of alkylene oxides with 2 moles of fatty acids, for example alkylene oxide diesters of alkylates, alkylene Condensation products of oxides and fatty alcohols, examples of which include PEG 40 hydrogenated castor oil, steareth 2, isoseteth-20, and oleth-20. Other nonionic surfactants of the invention include condensation products of both alkylene oxides and fatty acids and fatty alcohols, the polyalkylene oxide moieties being esterified with fatty acids at one end and ethers with fatty alcohols at the other end. Become Other nonionic surfactants of the invention include alkyl glucosides and alkyl polyglycosides, polyhydroxy fatty acid amide surfactants, alkoxylated sugar esters and polyesters, and fatty acid amides.

Cationic surfactants of the present invention include ammonium halide compounds, including those having hydrophilic substituents.

Oily ingredients

In one preferred embodiment, the composition of the present invention contains an oily component useful for providing moisturizing efficacy to the skin. The oily component of the invention is a water insoluble component and therefore must be kept in an amount soluble / dispersible, for example by carboxylic acid / carboxylate copolymers or lower alkyl alcohols. The oily component, when included, contains from about 0.1% to about 15%, preferably from about 0.5% to about 10% of the total composition.

A wide variety of suitable oil compounds are known and may be used in the present invention and many examples are described in Sagarin, Cosmetics, Science and Technology, 2nd Edition, Vol. 3243 (1972). Non-limiting examples of suitable oily components include C _1-30 alcohol esters of C _1-30 carboxylic acids and C _2-30 dicarboxylic acids, hydrocarbon oils, mono-, di- and tri-of C _1-30 carboxylic acids. Glycerides, silicone oils, mineral oils and petrolatum, vegetable oils and hydrogenated vegetable oils, animal fats and oils, silicone oils, fragrance oils, and mixtures thereof, preferably hydrocarbon oils, fatty acid esters, silicone oils and mixtures thereof.

Hydrocarbon oils useful in the present invention include those having from about 7 to about 40 carbons. Examples of such hydrocarbon materials include dodecane, isododecane, squalane, hydrogenated polyisobutylene, docoic acid (ie , C ₂₂ hydrocarbons), hexadecane, and isohexadecane. Also useful are C _7-40 isoparaffins, which are C _7-40 branched hydrocarbons. Preferred hydrocarbon oils are isohexadecane, squalane, light paraffin, light isoparaffin, light liquid paraffin, light liquid isoparaffin (Isoper G (R), sold from Presperse as Permethyl 101A. Sold by Exxon, sold by Idemitsu as Isoparaffin® 2028, or by Ashland as Amoco Mineral Spirits (registered trademark) Commercially available hydrocarbons).

Fatty acid esters useful in the present invention include cetyl 2-ethylhexyl, isopropyl myristate, myristyl myristate, isopropyl palmitate, cholesterol; More preferably cetyl 2-ethylhexyl and myristyl myristate; And triglycerides such as caprylic / capric triglycerides, PEG-6 caprylic / capric triglycerides, and PEG-8 caprylic / capric triglycerides, meadowfoam Contains seed oil.

Silicone oils useful in the present invention may be volatile, nonvolatile, or a mixture of volatile and nonvolatile silicones. As used in this context, the term "nonvolatile" refers to silicon that is liquid under ambient conditions and has a flash point (under 1 atm) of greater than about 100 ° C. The term "volatile" as used in this context refers to all other silicone oils. Suitable silicone oils can be selected from a variety of silicones having a wide range of volatility and viscosities. Nonvolatile polysiloxanes are preferred but small amounts of volatile polysiloxanes may also be used. Non-limiting examples of suitable silicones are disclosed in US Pat. No. 5,069,897 to Orr, issued December 3, 1991, which is incorporated herein by reference in its entirety. Examples of suitable silicone oils include polyalkylsiloxanes, cyclic polyalkylsiloxanes and polyalkylarylsiloxanes. Commercially available polyalkylsiloxanes include polydimethylsiloxane, also known as dimethicone, examples of which include the Visicasil® series and Dow Corning Corporation sold by General Electric Company. Dow Corning® 200 series sold by the company. Suitable dimethicones include alkyl substituted dimethicones such as cetyl dimethicone and lauryl dimethicone. Commercially available dimethiconols are typically sold as a mixture with dimethicone or cyclomethicone (eg, Dow Corning® 1501 and 1503 fluids). Commercially available cyclic polyalkylsiloxanes include Dow Corning® 244 fluid, Dow Corning® 344 fluid, Dow Corning® 245, and Dow Corning® 345 fluid.

Additional ingredients

The composition of the present invention may be selected by an operator depending on the characteristics of the desired final product and further contains other additional ingredients suitable for making the composition more cosmetically or aesthetically acceptable or providing additional use effects to the composition. You may.

The composition of the present invention may further contain a skin benefit agent in addition to the skin lightening agent. As used herein, the term "skin benefit agent" means an active ingredient that provides a cosmetic and / or therapeutic effect to the application site on the skin, hair, or nails. Additional skin benefit agents useful in the present invention include anti-acne agents, emollients, nonsteroidal anti-inflammatory agents, local anesthetics, artificial tanning agents, fungicides, antimicrobial and antifungal actives, skin calming agents, sunscreening agents, skin barrier repair agents, anti-wrinkle agents, Anti-skin atrophy actives, lipids, sebum inhibitors, skin sensates, protease inhibitors, skin tonics, anti-itch, hair growth inhibitors, dermabrasion enzyme enhancers, anti-glycosylating agents, and mixtures thereof.

Compositions of the present invention include Germall 115, methyl, ethyl, propyl and butyl esters of hydroxybenzoic acid, benzyl alcohol, sodium metabisulfite, imidazolidinyl urea, EDTA and its salts, bronopol (2- Water soluble or water soluble preservatives including bromo-2-nitropropan-1,3-diol) and phenoxypropanol; Antifoam; Binders; Bio additives; Bulking agents; coloring agent; Fragrances, essential oils and solubilizing agents; Other natural extracts; Compounds that promote collagen production; It may further contain preservatives and antiseptic enhancers such as water soluble or water soluble preservatives, including yeast fermentation filtrates, and others.

How to use

The compositions of the present invention are particularly useful for providing skin care products such as skin lotions that can be used for a long time for skin whitening.

The composition of the present invention is also useful for use as a medium for providing ultrasound to the skin using an ultrasonic application device. Without being limited by theory, the rheology of the compositions of the present invention is particularly effective in maintaining a stable gel structure despite the combination of heat and vibration that can be generated by ultrasound while effectively delivering ultrasound while moving the device along the skin surface. Deemed suitable. If relatively high frequency ultrasound is used, the compositions of the present invention are believed to improve the permeability of skin lightening agents. In one very preferred embodiment, when the composition of the present invention is used as a medium, ultrasound at a frequency of about 3 MHz to about 10 MHz and an intensity of about 0.1 W / cm 2 to about 2 W / cm 2 is applied to the skin, the ultrasound or Significant skin lightening effects are provided as compared to the individual application of the compositions of the present invention.

EXAMPLE

The following examples describe and illustrate preferred embodiments within the scope of the invention. This embodiment is given for illustrative purposes only and should not be construed as limiting the invention, as many variations of the invention are possible without departing from the spirit and scope of the invention.

Example 1-6

The following composition is formed by the process described herein:

Composition

Manufacturing method

The skin care compositions of Examples 1-6 can be prepared by any conventional method known in the art. Suitably the composition is prepared as follows:

The cellulose derivative polymer, and the acrylate / C10-30 alkyl acrylate crosspolymer, when included, are added to water and mixed to dissolve. The resulting mixture was heated to at least about 70 ° C. and contained in the composition, butylene glycol, pentylene glycol, dimethicone / dimethiconol, isohexadecane, benzyl alcohol, methylparaben, disodium EDTA, sodium meta Bisulfite and sodium benzoate are added. The resulting mixture is cooled to about 40 ° C. or less, and when contained, ascorbyl glucoside, niacinamide, glycyrrhizinic acid, and ethanol are added. Finally the mixture obtained is neutralized with sodium hydroxide. The pH of all compositions is between 5 and 8.

This embodiment, represented by the previous examples, is useful as a skin care product. When applied to facial skin, they offer many advantages. For example, they can provide long term skin lightening effects and, when applied to the skin, can provide good adhesion to the skin and a fresh, light feel to the skin.

In addition, when ultrasound is applied to the skin at a frequency of about 3 MHz to about 10 MHz and an intensity of about 0.1 W / cm 2 to about 2 W / cm 2 using the composition of the present invention as a medium, the product effectively delivers the ultrasound and It helps the device move along the skin surface while maintaining a stable gel structure.

Claims (1)

(1) 10% skin lightener; (2) 10% of a viscous agent to provide a viscosity of 1,000 mPas to 1,000,000 mPas, wherein the viscosifier comprises (a) a carboxylic acid / carboxylate copolymer, and (b) a cellulose derivative polymer; and ; (3) 10% of pentylene glycol as wetting agent; (4) 10% of an aqueous carrier; Skin care composition free of surfactant.