JP4964253B2 - Transparent sunscreen gel and method of use - Google Patents

Description

  The present invention relates to skin care cosmetic compositions and methods of use thereof. In particular, the present invention relates to a novel clear, alcohol-free sunscreen gel and method of use.

  The negative effects of exposure to sunlight are well known. For example, if the skin is exposed to UV radiation having a wavelength of about 290 to about 400 nm, the skin may be subject to short-term damage (eg, sunburn and premature aging) when exposed to sunlight for extended periods of time. is there. Furthermore, if damaged for a long time, a serious condition such as skin cancer may occur. The demand for sunscreen products continues as a result of health hazards that result from excessive exposure to the sun. Accordingly, various sunscreen products are commercially available, including sunscreen containing daily products. As the use of sunscreen products increases, consumer demand not only effectively blocks sunlight, but also requires the development of sunscreen products that are aesthetically pleasing when applied to the skin.

  Transparent cosmetic compositions are commonly used in antiperspirants and hair gels. The composition typically includes a polyol and a silicone emulsifier having a consistent refractive index to give a clear emulsion, also known as a gel. However, conventional transparent sunscreen agents require additional wax because the commonly used silicone elastomers do not sufficiently thicken the sunscreen component. Unfortunately, additional waxes are unattractive to consumers because they detract from the transparency of conventional clear sunscreen compositions and often result in compositions that are too thick. In addition, conventional sunscreen compositions typically contain alcohol, which can irritate or dry the skin when sunscreen products are applied for this alcohol.

  Accordingly, there remains a need for an improved clear sunscreen gel composition that has sufficient viscosity while maintaining the desired transparency and is aesthetically pleasing to the consumer. Furthermore, there is a need for an improved transparent sunscreen gel composition that is essentially alcohol free and therefore does not irritate the skin.

  In one aspect, the present invention includes at least one chemical ultraviolet (UV) radiation absorber, at least one solvent and at least one diphenyl silicone elastomer gelling agent, is transparent and essentially free of alcohol. The present invention relates to a cosmetic composition.

  As used herein, the term “transparent” means that the composition or material has an RI that matches its surrounding refractive index (RI), ie, that the composition or material is in its functional environment. To be transparent within the scope and to the environment. The transparent composition or material described in the present invention preferably exhibits a light transmission of about 70% or more, more preferably about 75% or more, and does not exhibit light scattering.

  The term “essentially free of alcohol” as used herein means that the composition or material has an ethyl alcohol content of less than about 0.5% of the total weight of the composition or material. Point to.

  In another aspect, the present invention relates to a method of using the cosmetic composition for protecting the skin from the harmful effects of UV radiation by applying the transparent cosmetic composition described above to the skin.

  Other aspects and objects of the invention will become more apparent from the following description, examples, and claims.

  Numbers indicating the amount or ratio of materials or reaction conditions, physical properties of materials, and / or uses herein, except in examples and comparative examples, or where otherwise clearly indicated. Should be understood to be modified by the word “about”. Unless otherwise stated, all amounts are by weight of the final composition.

  In the present invention, surprisingly, a stable alcohol-free and transparent cosmetic composition is formed by combining a specific diphenyl silicone elastomer gelling agent and one or more specific non-alcohol solvents with a chemical UV absorber. It has been found that this composition is particularly useful as an aesthetically attractive transparent sunscreen gel. As used herein, the term “stable” means that the composition has sufficient physical and chemical stability so that the composition does not separate or settle when all ingredients are added. Point to. As used herein, the term “aesthetically attractive” refers to having a powdery, velvety and silky texture when the composition is applied to the skin.

  As a first essential component of the transparent cosmetic composition of the present invention, a chemical UV absorber is used. The chemical UV absorber can be any suitable chemical UV absorber commonly used in cosmetic compositions. Specific examples of suitable chemical UV absorbers include, but are not limited to, benzophenone-3, homosalate, ethylhexylmethoxycinnamate, avobenzone, ethylhexylsalicylate and octocrylene, and combinations thereof. The chemical UV radiation absorber is preferably present in the transparent cosmetic composition of the present invention in an amount ranging from about 1 to about 20%, more preferably from about 2 to about 15% of the total weight of the composition. . In particular, the transparent cosmetic composition of the present invention does not contain physical UV absorbers (eg, titanium oxide and zinc oxide) which are known to impair the transparency of the composition.

  At least one solvent system is used as the second essential component of the transparent cosmetic composition of the present invention. The solvent system may consist of one or more suitable solvents for solubilizing and carrying the chemical UV absorber. Specific examples of suitable solvents include dimethicone (eg DM-fluid A-6CS available from Shin-Etsu Chemical Co., Ltd., Tokyo, Japan), dicaprylyl carbonate (eg, Cognis, Cincinnati, Ohio). Cetiol® CC available from Corporation), lauryl lactate (eg, ceryl® 31 available from International Specialty Products, located in Wayne, NJ), neopentyl glycol diheptanoate (eg, Pennsylvania) Including, but not limited to, Lexfeel® 7), glycerin and combinations thereof available from Inolex Chemical Co., Philadelphia, USA No. The composition of the present invention preferably contains, but is not essential, a silicone-based solvent (eg, dimethicone) that is particularly compatible with the chemical UV absorbers described above. The solvent may be present in an amount ranging from about 1 to about 30%, preferably from about 10 to about 29%, most preferably from about 15 to about 28% of the total weight of the composition.

  It is known that chemical UV absorbers are often in the form of powders with low transparency. Large amounts of ethyl alcohol are used in conventional sunscreen compositions to increase the solubility of chemical UV absorbers. However, sunscreen compositions with a high ethyl alcohol content usually cause irritation when the composition is applied to the skin. In the present invention, surprisingly, the use of a third essential component, namely a diphenyl silicone elastomer gelling agent, more specifically a diphenyl silicone elastomer gelling agent comprising diphenylsiloxyphenyl trimethicone, in the absence of ethyl alcohol. However, it has been found that the solubility of chemical UV radiation absorbers can be effectively increased. While not intending to be bound by theory, it is believed that the interaction of the diphenyl group of the silicone elastomer gelling agent and the diphenyl group of the UV absorber increases the solubility of the UV absorber in the composition. The total amount of diphenylsiloxyphenyl trimethicone in the sunscreen composition of the present invention can range from about 1 to about 50% of the total weight of the composition.

  In one specific embodiment of the invention, the diphenyl silicone elastomer gelling agent comprises a mixture of diphenylsiloxyphenyl trimethicone and dimethicone / phenylvinyl dimethicone crosspolymer. Preferably, the mixture comprises about 80 to about 90% diphenylsiloxyphenyl trimethicone and about 10 to about 20% dimethicone / phenylvinyl dimethicone crosspolymer based on the total weight of the mixture. For example, KSG-18A, which is a mixture of about 85% by weight diphenylsiloxyphenyl trimethicone and about 15% by weight dimethicone / phenylvinyl dimethicone cross-polymer available from Shin-Etsu Chemical Co., Ltd. located in Tokyo, Japan. Are used as diphenyl silicone elastomer gelling agents in the compositions of the present invention. When KSG-18A is used as a gelling agent in the compositions of the present invention, it is 35 to about 55%, more preferably about 40 to about 50%, most preferably about 44 to about 46, of the total weight of each composition. It can be present in an amount in the range of%.

  In another specific embodiment of the present invention, the diphenyl silicone elastomer gelling agent comprises a mixture of diphenylsiloxyphenyl trimethicone, dimethicone / phenylvinyl dimethicone crosspolymer, and methyl trimethicone. Preferably, the mixture comprises about 10 to about 15% diphenylsiloxyphenyl trimethicone, about 25 to about 35% dimethicone / phenylvinyl dimethicone crosspolymer, and about 55 to about 60% methyltrimethyl. Made of methicone. For example, about 13 wt.% Diphenylsiloxyphenyl trimethicone, about 30 wt.% Dimethicone / phenylvinyl dimethicone crosspolymer, and about 57 wt.% Methyl available from Shin-Etsu Chemical Co., Ltd., Tokyo, Japan. X-21-5562D, a mixture of trimethicone, is used as the diphenyl silicone elastomer gelling agent in the composition of the present invention. When X-21-5562D is used as a gelling agent in the composition of the present invention, it is about 5 to about 25%, more preferably about 7 to about 20%, most preferably about 10 to 10% of the total weight of the composition. It can be present in an amount in the range of about 17%.

  In yet another embodiment of the invention, the diphenyl silicone elastomer gelling agent is a first mixture of diphenylsiloxyphenyl trimethicone and dimethicone / phenylvinyl dimethicone crosspolymer (eg, KSG-18A) and diphenylsiloxyphenyl as described above. It can consist of a second mixture of trimethicone, dimethicone / phenylvinyldimethicone crosspolymer, and methyltrimethicone (eg X-21-5562D).

  In order to further improve the texture of the transparent cosmetic composition of the present invention, a composite silicone powder in which a silicone rubber core is coated with a silicone resin shell may optionally be added to the composition. Specific examples of composite silicone powders suitable for use in the present invention include KSP-100 powder comprising vinyl dimethicone / methicone silsesquioxane cross-polymer available from Shin-Etsu Chemical Co., Ltd., located in Tokyo, Japan. Is included, but is not limited to this. KSP-100 composite silicone powder has good dispersibility / extensibility and gives a unique soft silk-like feel with little aggregation. When KSP-100 is used in the composition of the present invention, it may be present in an amount ranging from about 0.5 to about 10%, more preferably from about 1% to about 5% of the total weight of the composition.

  Furthermore, the transparent cosmetic composition of the present invention can optionally include a thickening agent to increase the viscosity of the composition without adversely affecting transparency and aesthetic appeal to the consumer. Preferably, the thickening agent comprises a dimethicone / phenylvinyl dimethicone crosspolymer. More preferably, the thickener comprises a mixture of dimethicone / phenylvinyl dimethicone crosspolymer and phenyl trimethicone, such as KSG-18 silicone paste available from Shin-Etsu Chemical Co., Ltd. located in Tokyo, Japan. When KSG-18 is used as a gelling agent in the compositions of the present invention, it is 35 to about 55%, more preferably about 40 to about 50%, most preferably about 44 to about 46, of the total weight of each composition. It can be present in an amount in the range of%.

  The transparent cosmetic composition of the present invention described above is anhydrous (ie contains less than about 0.5% of the total weight of the composition) and contains no alcohol (ie ethyl alcohol in the composition). Preferably less than about 0.5% of the total weight). More preferably, the composition of the present invention is in the form of a gel emulsion and has a viscosity in the range of 16,000-28,000 cps.

  Other bioactive agents may be added to the compositions of the present invention if desired so long as the transparency and viscosity are not impaired. Routine experimentation can determine the amount necessary to maintain a stable composition. The type of bioactive agent added can be those advantageously used in topical cosmetic or pharmaceutical compositions. For example, the composition may further comprise a wetting agent; an agent used to treat stains, keratosis and wrinkles; Agents, anti-dandruff agents, anti-dermatitis agents, anti-pruritic agents, antiemetics, anti-motion sickness, anti-irritants, anti-inflammatory agents, anti-hyperkeratolytic agents, anti-dry skin agents, anti-psoriasis agents, anti-seborrheic agents It may contain anti-aging agents, anti-wrinkle agents, additional sunscreen agents, antihistamines, skin lightening agents, depigmenting agents, wound treatment agents, vitamins, corticosteroids, self-tanning agents or hormones. The bioactive agents described above are merely optional components of the sunscreen composition of the present invention and may be omitted from the composition if they do not substantially affect the sunscreen function of the composition.

  The sunscreen composition of the present invention may further comprise cosmetically acceptable excipients as long as the transparency and viscosity are not impaired. Substances that can be incorporated into the sunscreen composition of the present invention include wetting agents, astringents, chelating agents, surfactants, emollients, preservatives, stabilizers, humectants, fragrances, etc. It is not limited to. While it is preferred that these excipients help form a protective layer on the skin, it is not essential. One or more excipients are present in the topical composition of the present invention from about 1 to about 99.9%, preferably from about 50 to about 99.5%, more preferably about 70% of the total weight of the topical composition. May be present in an amount ranging from about 99%, most preferably about 80-90%.

  For example, emollients that can be used in the sunscreen composition of the present invention include stearyl alcohol, cetyl alcohol, oleyl alcohol, isocetyl alcohol, fatty alcohol, propane-1,2-diol, butane-1,3-diol. , Octadecan-2-ol, glyceryl monostearate, isopropyl isostearate, stearic acid, isostearic acid, isocetyl stearate, isopropyl stearate, butyl stearate, isopropyl laurate, hexyl laurate, decyl oleate, isobutyl palmitate, Cetyl palmitate, isopropyl palmitate, palmitic acid, dimethylpolysiloxane, glyceryl monoricinoleate, di-n-butyl sebacate, isopropyl myristate, myristic acid Includes chill, myristyl myristate, isopropyl linoleate, lauryl lactate, myristyl lactate, polyethylene glycol, triethylene glycol, lanolin, acetylated lanolin, sesame oil, coconut oil, peanut oil, castor oil, mink oil, mineral oil and petroleum However, it is not limited to these.

  Various preservatives can also be added to the sunscreen composition of the present invention to provide a long shelf life. Suitable preservatives include potassium sorbate, imidazolidinyl urea, p-hydroxybenzoate, p-hydroxybenzoate, CTFA-designated paraben, ethylhexyl glycerin, caprylyl glycol / phenoxyethanol / hexylene glycol, and the like. It is not limited. Other preservatives suitable for use in the sunscreen compositions of the present invention are disclosed in International Cosmetic Ingredient Dictionary and Handbook, 12th Edition (2004), which is incorporated herein by reference in its entirety. .

  Humectants that can be used include polyhydric alcohols including glycerol, polyalkylene glycols and alkylene polyols, and mixtures thereof, hyaluronic acid, urea, glycerin, sorbitol, sodium 2-pyrrolidone-5-carboxylate, soluble collagen, dibutyl phthalate and Gelatin is included, but is not limited to these.

  The clear sunscreen composition of the present invention may optionally contain a sufficient amount of perfume to make the composition more attractive to the consumer. A preferred perfume amount is from about 0.01 to about 10% of the total weight of the composition.

  The sunscreen composition described above is particularly useful as a skin protection or skin treatment product for protecting human skin from the harmful effects of UV radiation. The sunscreen composition may be applied to the eyes, cheeks, chin, neck, and other facial areas, and may be applied to other body areas that are potentially sensitive to UV radiation.

  The method of use for the sunscreen composition of the present invention depends on the ultimate intended use of the composition. For example, the sunscreen composition of the present invention can be applied to the skin as needed to provide occasional protection from particularly intense sun exposure. Alternatively, the sunscreen composition may be applied periodically to the skin, and this is preferred. For example, the sunscreen composition may be applied periodically at a frequency in the range of about 1 time / week to about 3 times / day.

  The following examples further illustrate the novel compositions and methods of the present invention, but the invention is not limited thereto.

  The following compositions give examples of some preferred embodiments of the invention in the form of emulsion gels.

Composition A

Composition B

Composition C

The following examples show comparative results for compositions using various gelling substances (shown in bold). All ingredients were mixed together and observed for transparency and stability for 24 hours.

  As can be seen from Table 1, the composition containing the diphenyl silicone elastomer gelling agent of the present invention (ie, X-21-5562D gelling agent) was the only composition that maintained sufficient stability and transparency. .

The following examples show comparative results of compositions containing various different solvents in the basic composition 1 of Example 2 described above. Each solvent was mixed in the basic composition 1 of Example 2 and observed for transparency and stability for 24 hours.

  As can be seen from Table 2, only certain solvents give stable and transparent gels, while other solvents do not compromise the stability of the composition or produce gel compositions.

Claims (16)

At least one chemical ultraviolet (UV) radiation absorber; at least one solvent selected from the group consisting of dimethicone, dicaprylyl carbonate, lauryl lactate, neopentyl glycol diheptanoate, glycerin and combinations thereof; and diphenylsiloxy Comprising at least one gelling agent comprising a mixture of phenyltrimethicone, dimethicone / phenylvinyldimethicone crosspolymer and methyltrimethicone, transparent and having an ethyl alcohol content of less than 0.5% of the total weight of the composition A cosmetic composition.   The composition of claim 1, wherein the chemical UV absorber is selected from the group consisting of benzophenone-3, homosalate, ethylhexylmethoxycinnamate, avobenzone, ethylhexylsalicylate, octocrylene, and combinations thereof.   The composition of claim 1, wherein diphenylsiloxyphenyl trimethicone is present in a concentration ranging from 1 to 50% of the total weight of the composition. The gelling agent comprises a first mixture of diphenylsiloxyphenyl trimethicone and dimethicone / phenylvinyl dimethicone crosspolymer and a second mixture of diphenylsiloxyphenyl trimethicone, dimethicone / phenylvinyl dimethicone crosspolymer and methyltrimethicone. Composition.   The composition of claim 1 further comprising a composite silicone powder having a silicone rubber core and a silicone resin shell.   The composition according to claim 5, wherein the composite silicone powder comprises a vinyl dimethicone / methicone silsesquioxane crosspolymer.   The composition of claim 1 further comprising a thickener comprising a dimethicone / phenylvinyl dimethicone crosspolymer.   8. A composition according to claim 7, wherein the thickener comprises a mixture of dimethicone / phenylvinyl dimethicone crosspolymer and phenyl trimethicone. At least one chemical ultraviolet (UV) radiation absorber; at least one solvent selected from the group consisting of dimethicone, dicaprylyl carbonate, lauryl lactate, neopentyl glycol diheptanoate, glycerin and combinations thereof; and diphenylsiloxy A transparent cosmetic comprising at least one gelling agent comprising a mixture of phenyltrimethicone, dimethicone / phenylvinyldimethicone crosspolymer and methyltrimethicone, wherein the content of ethyl alcohol is less than 0.5% of the total weight of the composition A method of protecting skin from the harmful effects of ultraviolet (UV) radiation, comprising the step of applying the composition to the skin.   10. The method of claim 9, wherein the chemical UV absorber is selected from the group consisting of benzophenone-3, homosalate, ethylhexylmethoxycinnamate, avobenzone, ethylhexylsalicylate, octocrylene, and combinations thereof.   10. The method of claim 9, wherein diphenylsiloxyphenyl trimethicone is present at a concentration in the range of 1-50% of the total weight of the composition. The gelling agent comprises a first mixture of diphenylsiloxyphenyl trimethicone and dimethicone / phenylvinyl dimethicone crosspolymer and a second mixture of diphenylsiloxyphenyl trimethicone, dimethicone / phenylvinyl dimethicone crosspolymer and methyltrimethicone. the method of.   The method of claim 9, wherein the transparent cosmetic composition further comprises a composite silicone powder having a silicone rubber core and a silicone resin shell.   14. The method of claim 13, wherein the composite silicone powder comprises a vinyl dimethicone / methicone silsesquioxane crosspolymer.   The method of claim 9, wherein the transparent cosmetic composition further comprises a thickening agent comprising a dimethicone / phenylvinyl dimethicone crosspolymer.   16. The method of claim 15, wherein the thickening agent comprises a mixture of dimethicone / phenylvinyl dimethicone crosspolymer and phenyl trimethicone.