High SPF Gel Composition

Abstract

The present invention relates to a photoprotective personal care composition that provides a high sun protection index and very good sensory properties that consumers expect when such a composition is applied to the skin. This is achieved by a composition comprising a combination of an oil-soluble sunscreen, a water-soluble sunscreen, a water-phase thickener, an oil-phase thickener, a humectant, and a specific sensory modifier.

Description

Technical Field

[0001] The present invention relates to a photoprotective personal care composition that provides a high sun protection factor (SPF). Specifically, the present invention relates to a high-SPF gel composition that provides very good sensory properties expected by consumers when such a composition is applied to the skin, such as low oiliness and good stretchability.

Background Art

[0002] Solar radiation contains about 5% ultraviolet (UV) radiation, the wavelength of which is between 200 nm and 400 nm. This is further divided into three regions: 320 - 400 nm (UV-A), 280 - 320 nm (UV-B), and 200 - 280 nm (UV-C). A significant portion of UV-C radiation is absorbed by ozone. Scientific studies have shown that short-term exposure to UV-A and UV-B radiation can cause pigmentation, skin redness, and local inflammation, while continuous or long-term exposure can lead to sunburn, melanoma, wrinkle formation, and bruising. UV radiation is also thought to cause significant damage to hair. Therefore, it is desirable to protect the human skin and other keratinous substrates from the harmful effects of both UV-A and UV-B radiation. This is provided by cosmetic compositions that provide a high SPF (sun protection factor).

[0003] Various cosmetics for preventing and / or protecting the skin from the harmful effects of ultraviolet rays have been reported. In the field of cosmetics, a number of organic sunscreens capable of absorbing UV-A rays have been reported, among which a particularly useful sunscreen is t-butylmethoxydibenzoylmethane (known as avobenzone and sold as Parsol® 1789). Various UV-B sunscreens are used in personal care compositions for protection from UV-B rays. Many cosmetic manufacturers prefer to include both UV-A and UV-B sunscreens in their photoprotective compositions to provide protection over the entire range of UV light.

[0004] One such patent by the present applicant is published as EP2575748B1, which discloses a composition providing a high SPF. This publication only discloses the use of certain oil-soluble sunscreens. Due to the emergence of many water-soluble sunscreens, the inventors experimented with combinations of oil-soluble and water-soluble sunscreens to achieve a better SPF. They also wanted to achieve a high SPF through a gel-type composition that is generally preferred by many consumers because when such a composition is applied to the skin, it is light, less greasy, and gives a pleasant skin feel. When realizing the advantage of high SPF through a composition containing both oil-soluble and water-soluble sunscreens, the inventors found that it is difficult to stabilize them in such a gel composition when the water-soluble sunscreens (usually added in the form of salts) are included, that is, it is difficult to provide a stable gel composition containing water-soluble sunscreens. Therefore, the inventors not only had to stabilize the water-soluble sunscreens while ensuring the desired high SPF, but also had to provide the desired tactile properties such as low oiliness and good spreadability. Through extensive experiments, the inventors were able to ensure the achievement of the desired high SPF and the desired sunscreen stability by including selected aqueous phase thickeners, certain types of oil phase thickeners, and certain humectants in the sunscreen.

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, it has been found that the composition prepared in this way is inferior in terms of feel. Being excellent in terms of feel means that the composition gives the skin an excellent moisturizing feeling without being too oily. In other words, consumers expect to give moisture to the skin while enjoying a non-greasy (not oily) appearance. Furthermore, consumers also expect other properties such as ease of stretching and a mild, gentle and non-sticky feel on the skin. The inventors have confirmed that by incorporating a specific feel modifier, the above-mentioned desirable feel can be achieved. The high SPF thus achieved has been confirmed to prevent the skin from darkening and reduce spots and darkening.

[0006] Accordingly, an object of the present invention is to provide a gel-form photoprotective personal care composition containing a sunscreen that is either oil-soluble or water-soluble, which not only provides a high SPF but also gives a light, non-greasy and non-sticky feel when applied to the skin. Another object of the present invention is to provide such a photoprotective personal care composition that is a stable gel composition.

Means for Solving the Problems

[0007] The first aspect of the present invention is (i) 0.1 to 25% by weight of an oil-soluble sunscreen; (ii) 0.1 to 5% by weight of a water-soluble sunscreen; (iii) A water-phase thickener selected from one or both of 0.25 to 5% by weight of a polysaccharide gum and an ammonium acryloyldimethyltaurate / VP copolymer, and an ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer; (iv) An oil-phase thickener selected from one or more of esters of C18-C36 fatty acids, esters of C8-C16 fatty acids, a polymeric oil-phase thickener, and particles selected from organomodified clays, hydrophobically modified fumed silica and aerogel; (v) A humectant selected from 0.5 to 15% by weight of glycerol or glycol; and (vi) A sensory modifier selected from one or more of 0.5 to 10% by weight of modified starch, silica microspheres, and a polymer of dimethicone / vinyl dimethicone cross polymer and silica It relates to a high-SPF gel composition containing the same.

[0008] Another aspect of the present invention relates to a method of providing photoprotection with a sun protection factor (SPF) of at least 30, including the step of applying the composition of the first aspect to a desired skin surface.

Mode for Carrying Out the Invention

[0009] These and other aspects, features and advantages will become apparent to those skilled in the art upon reading the following detailed description and the appended claims. To avoid misunderstanding, any feature of one aspect of the present invention can be utilized in any other aspect of the present invention. The term "comprising" is intended to mean "including", but does not necessarily mean "consisting of" or "composed of". In other words, the recited steps or options need not be exhaustive. It should be noted that the examples given in the following description are intended to clarify the present invention and are not intended to limit the present invention to those examples themselves. Similarly, all percentages are by weight unless otherwise indicated. Unless otherwise indicated in the operating examples and comparative examples, or otherwise explicitly stated, all numbers in this specification and the claims indicating the amounts of materials or reaction conditions, physical properties and / or uses of the materials are understood to be modified by the word "about". A numerical range expressed in the form "x to y" is understood to include x and y. It is understood that when multiple preferred ranges for a particular feature are described in the form "x to y", all ranges combining different endpoints are also contemplated.

[0010] The light protection composition of the present invention is intended for use in personal care or cosmetic applications and can also be referred to as a personal care composition or a cosmetic composition. As used herein, "personal care composition" means a composition for topical application to the sun-exposed parts of human skin and / or hair. Such compositions can be classified as leave-on or rinse-off and include any product applied to the human body for appearance improvement, cleansing, odor control or general aesthetics. The composition of the present invention can be in the form of a liquid or a gel. Non-limiting examples of such sunscreen compositions include leave-on skin products such as antiperspirants, deodorants, sunscreen gels and wash-off shampoos, conditioners, facial cleansers and shower gels. The composition of the present invention is preferably a leave-on composition.

[0011] As used herein, "skin" means the skin of the face and body (e.g., neck, chest, back, arms, underarms, hands, legs and scalp), particularly the sun-exposed parts thereof. The composition of the present invention is also relevant for application to any other keratinous substrate of the human body other than the skin, such as hair, and the product can be formulated specifically for the purpose of improving light protection.

[0012] The composition of the present invention contains 0.1 to 25% by weight of an oil-soluble sunscreen. Oil-soluble means an organic sunscreen having a water solubility of less than 10 g / L, preferably less than 5 g / L, more preferably less than 2 g / L. The oil-soluble sunscreen can be of the UV-B type or the UV-A type. The composition of the present invention preferably contains 0.1 to 20% by weight, preferably 1 to 15% by weight of a UVB oil-soluble sunscreen. The composition of the present invention more preferably contains 0.1 to 5% by weight, preferably 1 to 4% by weight of a UVA oil-soluble sunscreen.

[0013] When an oil-soluble UVB sunscreen is included, it is preferably one or more of octyl salicylate (Eusolex® OS), 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate, ethylhexyl salicylate, 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate (also called octocrylene), 2-ethylhexyl 4-methoxycinnamate or octyl methoxycinnamate, ethylhexyl triazone, 3-benzylidenecamphor, cinoxate, diethylhexyl butamido triazone, para-aminobenzoic acid (PABA), ethyl dihydroxypropyl PABA, ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate, isoamyl p-methoxycinnamate, isopentyl trimethoxycinnamate trisiloxane, isopropylbenzyl salicylate, isopropyl methoxycinnamate, 4-methylbenzylidenecamphor, PEG-25 PABA, and pentyl dimethyl PABA. More preferred oil-soluble UVB sunscreens are selected from one or more of octyl salicylate, 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate, and octyl methoxycinnamate.

[0014] Some well-known products in which the above sunscreens are sold include Octisalate®, Homosalate®, Neo Heliopan®, Neo Heliopan® AV, Neo Heliopan® OS, Octocrylene®, and Parsol® MCX. The λmax of the oil-soluble UV-B sunscreen is 280 to 320 nm. The composition of the present invention may contain an organic oil-soluble UVA sunscreen. When included, it is selected from one or more of dibenzoylmethane compounds, diethylamino hydroxybenzoyl hexyl benzoate, and methyl anthranilate. The dibenzoylmethane compound is most preferred as the oil-soluble UVA sunscreen. Suitable dibenzoylmethane compounds are selected from one or more of t-butyl methoxydibenzoylmethane, 2-methyldibenzoylmethane, 4-methyldibenzoylethane, 4-isopropyldibenzoylmethane, 4-tert-butyldibenzoylmethane, 2,4-dimethyldibenzoylmethane, 2,5-dimethyldibenzoylmethane, 4,4'-diisopropyldibenzoylmethane, 2-methyl-5-isopropyl-4'-methoxydibenzoylmethane, 2-methyl-5-tert-butyl-4'-methoxydibenzoylmethane, 2,4-dimethyl-4'-methoxydibenzoylmethane, and 2,6-dimethyl-4-tert-butyl-4'-methoxydibenzoylmethane. The most preferred dibenzoylmethane compound is t-butyl methoxydibenzoylmethane, which is commercially available as Parsol 1789.

[0015] The composition of the present invention may contain both organic oil-soluble UVB and organic UVA sunscreens. Alternatively, there are certain oil-soluble sunscreens that have the blocking effect of both UVA and UVB. This is selected from one or more of bis-ethylhexyloxyphenol methoxyphenyl triazine, droxmetrizole trisiloxane, benzophenone, and its derivatives. The most preferred is bis-ethylhexyloxyphenol methoxyphenyl triazine, which is commercially available as Tinosorb S.

[0016] The composition of the present invention contains 0.1 to 5% by weight of a water-soluble sunscreen. A water-soluble sunscreen means that, whether it is of the UVA type or the UVB type, the water solubility of the sunscreen is higher than 10 g / L, preferably higher than 50 g / L at 25°C.

[0017] Preferred water-soluble UVB sunscreens for use in the present invention are phenylbenzimidazole 5-sulfonic acid (PBSA), benzophenone-4, or benzylidene camphor sulfonic acid, preferably PBSA. PBSA is also known by the alias Ensulizole and is commercially available as Eusolex 232 (manufactured by Merck KGaA). PBSA is also available under the trade names Neo Heliopan Hydro (manufactured by Symrise), Parsol HS (manufactured by DSM), and Sunsafe ES (manufactured by Uniproma). There are certain water-soluble sunscreens that have both UVA shielding efficacy and UVB shielding efficacy. Such sunscreens provide protection against both UVA and UVB, for example, benzophenone-4 (sold as Sulisobenzone). However, for the present invention, benzophenone-4 can be included as a water-soluble UV-B sunscreen.

[0018] Preferred UVA sunscreens for use in the present invention are one or more of disodium phenyl dibenzimidazole tetrasulfonate (Neoheliopan AP) or terephthalylidene dicamphor sulfonic acid (TDSA). Among these, disodium phenyl dibenzimidazole tetrasulfonate, also known as bisdisulizole disodium, is preferred. This is commercially available as Neoheliopan AP (manufactured by Symrise Shanghai Ltd) or Sunsafe DPDT (manufactured by Uniproma).

[0019] Terephthalylidene dicamphor sulfonic acid (TDSA) is also known as Ecamsule. This is commercially available as L'Oreal's Mexoryl SX (US4585597) or Sunsafe TDSA (Uniproma). Desired effects can be obtained by using it as the parent acid or its salt.

[0020] The composition preferably contains 0.1 to 5% by weight, more preferably 1 to 4% by weight, of a water-soluble sunscreen. It is preferred that the composition contains both UVA and UVB water-soluble sunscreens. Most preferably, it contains either or both of 2-phenylbenzimidazole-5-sulfonic acid and disodium phenyl dibenzimidazole tetrasulfonate.

[0021] Water-soluble sunscreen agents for inclusion in the compositions of the present invention are generally commercially available in acid form. When included in a composition having an acid form (pre-neutralized form), i.e., a composition having a sulfonic acid group (-SO 3 H), the composition further contains a neutralizing agent for converting the acid form to a salt form, in which form it is known to be active as a sunscreen agent, except for Mexoryl SX which can act as a sunscreen agent regardless of neutralization. When included, the neutralizing agent is preferably 0.05 to 4% by weight, preferably 0.2% to 2% by weight, of the composition. As the neutralizing agent, an inorganic alkali or an organic alkali is preferred. As the organic alkali, amines such as triethanolamine or diethanolamine are preferred. The inventors have observed that inorganic alkalis are particularly preferred. Alkali metal hydroxides are preferred. The most preferred metal hydroxides for inclusion as a neutralizing agent in the compositions of the present invention are sodium hydroxide or potassium hydroxide. It is a particularly difficult problem to obtain the desired SPF improvement and the desired tactile sensory properties while stabilizing the salt form of the water-soluble sunscreen in the gel composition. The inventors have solved this problem by specifically selecting the claimed features (iii) to (vi) of the present invention, namely the aqueous phase thickener, the oil phase thickener, the humectant and the sensory modifier.

[0022] The composition of the present invention contains an aqueous phase thickener. The aqueous phase thickener can be selected from (i) polysaccharide gums and (ii) one or more of synthetic polymers selected from (a) ammonium acryloyldimethyltaurate / VP copolymer and (b) ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer. Among the above, polysaccharide gums are most preferred. Preferred polysaccharide gums contained in the composition of the present invention are one or more of xanthan gum, guar gum, cellulose gum, tara gum, gellan gum, gum arabic, sclerotium gum, carrageenan gum, and locust bean gum. The most preferred polysaccharide gum is xanthan gum. Xanthan gum is commercially available as Keltrol CG-V from CP Kelco suppliers. The ammonium acryloyldimethyltaurate / VP copolymer of the synthetic polymer is commercially available as Aristoflex AVC, and the ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer is commercially available as Aristoflex HMB. In a particularly preferred embodiment of the present invention, both a polysaccharide gum, such as xanthan gum, and the synthetic polymers Aristoflex AVC and Aristoflex HMB may be contained. The aqueous phase thickener is contained in the composition at 0.25 to 5% by weight, preferably 0.5 to 4% by weight, and most preferably 1 to 3% by weight.

[0023] The composition of the present invention contains an oil phase thickener selected from esters of C18-C36 fatty acids, esters of C8-C16 fatty acids; polymer oil phase thickeners, and one or more of particles selected from organically modified clays, hydrophobically modified fumed silica, and aerogels. Among these, esters of C18-C36 fatty acids are most preferred.

[0024] Suitable commercially available esters of C18-C36 fatty acids are C18-36 acid triglycerides (Syncrowax HGLC), C18-36 acid glycol esters (Syncrowax ERLC), glyceryl tribehenate (Syncrowax HRC), glyceryl hydroxystearate (Naturchem GMHS), glyceryl tri(12-hydroxystearate) (Thixcin R), C16-18 triglycerides, C16-24 triglycerides (Cremeol HF-62-SPC). An oil phase thickener particularly preferred for use in the compositions of the present invention is available as Syncrowax HGLC from Croda Personal Care. This has a melting point in the range of 60-70 °C and also functions as a structure builder, crystallinity regulator, and emulsion stabilizer.

[0025] An example of a C8-C16 fatty acid ester is hydrogenated coco glyceride (Softisan 100).

[0026] Polymer oil thickeners that may be included are sorbitol / sebacic acid copolymer behenate (Syncrowax ORM), tribehenin (and) sorbitol / sebacic acid copolymer behenate (Syncrowax OSW), dextrin palmitate (dextrin palmitate LDXP, HDXP, HDXP-KL), amide-terminated polyamides (OleoCraft LP-20, MP-30, HP-31 and MP-32), ester-terminated polyamides (Uniclear 100VG and C75V), stearoyl inulin (Rheopearl ISK2), poly C10-30 alkyl acrylate (Intellimer IPA 13-6 polymer), poly C10-30 alkyl acrylate-MP 48C (Intellimer IPA13-1 polymer), and PVP (FlexiThix (trademark) thickener).

[0027] The particles acting as the oil-phase thickener can be selected from one or more of organically modified clays such as cationic surfactants containing sepiolite, montmorillonite, hectorite or bentonite clay, fumed silica, hydrophobically modified fumed silica, and aerogels such as Dow Corning VM-2270 Aerogel microparticles, and Aerosil® R972 (Silica Silyate - Evonik).

[0028] The oil-phase thickener is preferably contained in the composition at 0.5 wt% to 10 wt%, more preferably 0.8 wt% to 5 wt%, and even more preferably 1 wt% to about 3 wt%.

[0029] The composition of the present invention contains a humectant selected from glycol or glycerol. The glycol is preferably selected from one or more of propylene glycol, butylene glycol, and caprylyl glycol. The humectant used in the present invention is one or both of glycerol and caprylyl glycol. The composition contains 0.5 to 15 wt%, preferably 1 to 10 wt%, more preferably 1 to 8 wt% of the humectant based on the composition.

[0030] The composition - modified starch, - silica microspheres and - dimethicone / vinyl dimethicone crosspolymer and silica polymer contains a sensory modifier selected from one or more of these.

[0031] Among these, it is most preferred that one or both of the silica microspheres and the polymer are contained in the composition.

[0032] The polymers used as sensory modifiers are preferably dimethicone / vinyl dimethicone cross polymer (and) silica. Dimethicone / vinyl dimethicone cross polymer (and) silica are available from Dow Corning as DOWSIL (trademark) 9701 Cosmetic Powder and are also known as DC9701. Silica microspheres are available from Kobo as MSS-500 / 3H.

[0033] Preferred modified starches are aluminum or sodium starch octenyl succinate, more preferably aluminum starch octenyl succinate. Aluminum starch octenyl succinate is a chemically modified starch, particularly an esterified starch. Such aluminum starch octenyl succinate is commercially available under the names Dry Flo (registered trademark) Pure and Dry Flo (registered trademark) PC from suppliers such as Akzo Nobel or Nouryon. Various other suppliers sell it under their own product names. In cosmetics and personal care products, aluminum starch octenyl succinate is used in the formulations of lotions, powders, makeup, and underarm deodorants. It is used as a thickening and binding agent, an anti-caking agent, and an oil-absorbing agent. The composition contains aluminum starch octenyl succinate, which is further formulated with other ingredients to provide additional benefits. For example, ingredients having the INCI name aluminum starch octenyl succinate (and) acrylate copolymer (and) magnesium carbonate can be included. This is available from Nouryon as NATRASORB (registered trademark) HFB. Its natural content is 81%, and the recommended uses are for moisture-resistant products, oil-control products, anhydrous products, antiperspirant sticks, sunscreens, and dry shampoos, etc., and it has various benefits such as oil absorption, anti-sagging relaxation, and fragrance retention. Literature on the ingredient from Nouryon describes it as cross-linked aluminum starch octenyl succinate surface-treated with an acrylate copolymer and magnesium carbonate.

[0034] The sensory conditioner is contained in the composition at 0.5% to 10% by weight, preferably 1% to 8% by weight, more preferably 1% to 5% by weight. Among these, when the polymer is contained, it is preferably 0.2% to 3% by weight of the composition, when the silica microspheres are contained, it is 0.2% to 3% by weight of the composition, and when the modified starch is contained, it is 0.5% to 4% by weight of the composition.

[0035] The composition of the present invention preferably substantially does not contain an emulsifier. An emulsifier is generally a surfactant or a surface active agent. Preferably, substantially not containing an emulsifier means that the emulsifier is contained in the composition of the present invention at 2% by weight or less, more preferably less than 2% by weight, even more preferably less than 1.5% by weight, even more preferably less than 1% by weight, and most preferably less than 0.5% by weight, and ideally not contained at all. Alternatively, the composition preferably contains 0% to 2% by weight, more preferably 0.1% to 1.5% by weight, even more preferably 0.25% to 1% by weight, and even more preferably 0.5% to 0.75% by weight of an emulsifier.

[0036] For example, the terms "substantially free of emulsifier" and "free of emulsifier" can be used interchangeably and will be understood to represent the same meaning.

[0037] Therefore, the composition preferably (i) 0.1 to 25% by weight of an oil-soluble sunscreen; (ii) 0.1 to 5% by weight of a water-soluble sunscreen; (iii) 0.25 to 5% by weight of a polysaccharide gum and a synthetic polymer selected from one or both of ammonium acryloyldimethyltaurate / VP copolymer and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer as a water phase thickener; (iv) An oil-phase thickener selected from esters of C18-C36 fatty acids, esters of C8-C16 fatty acids, polymeric oil-phase thickeners, and one or more of particles selected from organically modified clays, hydrophobically modified fumed silica, and aerogels, in an amount of 0.5 to 10%; (v) A humectant selected from glycerol or glycol in an amount of 0.5 to 15% by weight; and (vi) A sensory modifier selected from modified starch, silica microspheres, and one or more of polymers of dimethicone / vinyl dimethicone crosspolymer and silica, in an amount of 0.5 to 10% by weight The composition is a gel composition without an emulsifier, containing the above components.

[0038] Water is usually included as an acceptable base for cosmetics in the gel composition. Water may be included in the composition in an amount of 10 to 70% by weight, preferably 20 to 70% by weight, more preferably 20 to 65% by weight.

[0039] Preferably, the composition further contains niacinamide. Preferably, the composition contains niacinamide in an amount of 0.1 to 10% by weight, more preferably 1 to 8% by weight, even more preferably 2 to 7% by weight, and even more preferably 3 to 5% by weight.

[0040] In addition to the components disclosed above, the composition can contain other components to fulfill one or more functions of the present invention, and preferably also contains a carrier acceptable as a cosmetic. Skin softening substances can function as a carrier acceptable as a cosmetic. These can be in the form of silicone oils, natural or synthetic esters, and hydrocarbons. The amount of the skin softening agent can be in the range of 0.1 to 25% by weight, preferably 1 to 10% by weight of the composition. Silicone oils can be divided into volatile and non-volatile types. As used herein, the term "volatile" refers to a substance having a measurable vapor pressure at ambient temperature. Volatile silicone oils are preferably selected from cyclic (cyclomethicone) or linear polydimethylsiloxanes containing preferably 3 to 9, preferably 5 to 6 silicon atoms.

[0041] The composition of the present invention may also contain a colorant, an opacifying agent, and an abrasive. These substances may each be in the range of 0.05 to 5% by weight, preferably 0.1 to 3% by weight, of the composition.

[0042] The composition of the present invention preferably provides an in vitro sun protection factor (SPF) of at least 30, more preferably at least 40, even more preferably at least 50.

[0043] Method of using the composition The present invention also provides a method of providing photoprotection with a sun protection factor (SPF) of at least 30, which includes the step of applying the composition of the present invention to a desired skin surface. The composition of the present invention is mainly intended for products for topical application to human skin, especially as an agent for protecting against sunlight, preventing or reducing pigmentation, the appearance of wrinkled or aged skin, or stains. Preferably, this method is cosmetic / non-therapeutic.

[0044] In use, a small amount of the composition, for example 1 to 5 mL, is applied from a suitable container or applicator to the exposed areas of the skin, and then, if necessary, spread or rubbed into the skin using the hands, fingers, or a suitable instrument.

[0045] The individual sun protection factor (SPF) for each subject is defined as the ratio of the amount of energy (dose, in J / m 2 or number of seconds of exposure time) required to produce minimal erythema on the protected skin to the amount of energy required to produce minimal erythema on the untreated skin, and is calculated as follows.

[0046] SPF = MED-protected skin / MED-unprotected control site

[0047] The SPF of the product is calculated by taking the arithmetic mean of the individual SPF values of all subjects.

[0048] The above is a summary of the present invention, but it will be apparent to those skilled in the art that modifications, changes, and alterations can be made without departing from the scope and spirit of the invention described and claimed herein. The present invention will be further described below with the following non-limiting examples.

Example

[0049] Examples A, 1-3: Compositions within and outside the present invention and their effects in achieving SPF, UVAPF, and sensory properties Briefly, the compositions shown in the following table were prepared as follows. Glycerin, disodium EDTA, phenylbenzimidazole sulfonic acid (ensulizole), and sodium hydroxide (in an amount to adjust the pH to 7) were added to the water in the main container. The mixture was stirred until the aqueous phase became clear and heated to 70°C. If applicable, an oil phase containing an oil phase thickener, caprylyl glycol, ethylhexyl salicylate, octocrylene, octyl methoxycinnamate (Parsol® MCX), and butyl methoxydibenzoylmethane (Parsol® 1789) was prepared in a separate beaker and heated to 70°C. Aristoflex AVC and Aristoflex HMB were added to the main container while homogenizing. The aqueous phase turned into a clear gel when left standing. Then, the oil phase was added to the main container while homogenizing at 3500 rpm. The mixture was homogenized for 10 minutes, and then xanthan gum previously dispersed in 5 mL of water was added. DC245 and, if applicable, MSS 500 / 3H were mixed and added to the main container and mixed for 10 minutes. If applicable, Dowsil 9701 was added to the main container and mixing was continued. When the temperature of the main container reached 40°C or lower, ethyl alcohol, fragrance, and phenoxyethanol were added to the main container and mixed for 10 minutes. When the formulation reached room temperature and had a homogeneous structure, it was removed from the homogenizer and stored in a container.

[0050] Table 1 shows the various compositions in the prepared gel state.

[0051] Table - 1

Table 1

[0052] The in - vitro SPF and UVAPF values of the above - mentioned samples were measured using the following procedure.

[0053] Thin - film transmittance measurements were performed using a Labsphere ultraviolet transmittance analyzer. In this test, a 70×70 mm PMMA plate with a roughness of approximately 6 μm manufactured by Schoenberg GmbH&Co was used. The transmittance percentage of various compositions was measured using the procedure outlined below. A 2 mg / cm 2 sample was applied to the PMMA plate, distributed uniformly using a syringe, and spread evenly. The drying time of the PMMA plate was 30 minutes. After the drying time, the sample plate was exposed to UV light and a transmittance scan was recorded. From this scan, the transmittance as a function of wavelength (290 - 400 nm) for a particular sample was obtained. For one plate, 6 - 9 different spots were scanned. The same was repeated for 2 or 3 plates. Thus, the reported data is the average of 12 - 18 readings. A reference transmittance scan was obtained using a blank plate with no sample placed on a PMMA plate coated with glycerin. Using the transmittance values, the SPF value was obtained using the UV - 2000s application attached to the instrument.

[0054] The percentage of transmittance (and thus SPF) was measured as the in - vitro SPF at zero time (line 0 minutes). The same plate was exposed to light simulating sunlight, and the % transmittance was measured at specified time intervals from 0 - 60 minutes. The average absorbance at 310 nm and 355 nm was recorded to measure the % UVB and UVA light stability, respectively. The UV was generated using a solar simulator (Atlas kW system) with an irradiance of 550 Wm -2 at a distance of approximately 20 cm.

[0055] The SPF values and UVAPF values are summarized in Table 2 below.

[0056] Table - 2:

Table 2

[0057] The data in Table 2 above show that the SPF value and UVAPF value are much lower in the composition outside the present invention (Example A) that does not contain a sensory regulator than in the compositions within the present invention (Examples 1 to 3) that contain different combinations of sensory regulators in various amounts.

[0058] Differences in sensory benefits upon use of various compositions: For the compositions according to the present invention (Examples 1 to 3), the following procedure was used to investigate the differences in the sensory effects they provide.

[0059] This test was conducted on a total of 50 female subjects. The subjects participated in a product use test to evaluate the tactile performance of the test products. Each product was evaluated for 5 days. This study had a sequential monadic design. A structured questionnaire was used to obtain digital feedback to understand product preferences such as the absence of skin color unevenness, fairer / brighter skin, glow, sweating, comfort and freshness, the feel of the face after application (oily / sticky / greasy), sun protection, matte feel, spreadability, speed of absorption, light feel, moisturization, stickiness, peeling, etc.

[0060] Each panelist evaluated the samples over 5 days. The overall preference for the samples is summarized in Table 3 below.

[0061] Table - 3:

Table 3

[0062] The data in Table - 3 above show that the composition of Example 1 is the most preferred, followed by Example 2, and then Example - 3 in that order.

[0063] The data shows that the composition according to Example 1, which contains a large amount (2%) of the oil-phase thickener (Syncrowax HGLC) and 1.5% of silica microspheres (MSS-500 / 3H) and 1% of a polymer (DC9701) as a sensory modifier, is more preferable than Example 2, which contains a small amount (1%) of the oil-phase thickener, the same amount of silica microspheres, and a large amount (2%) of the polymer. Example 3 further contains starch-based sensory modifiers (Natrasorb HFB and Dry Flo pure) and is the least preferable compared to Example 1.

[0064] In terms of qualitative characteristics, all samples (Examples 1 to 3) were highly evaluated for spreadability, rapid absorption, light touch, and high moisturizing properties.

[0065] Examples 1 and 2 were significantly superior to Example 3 in terms of uniform skin color, brighter skin, shine, sweating, and comfort and freshness.

[0066] Example 1 was significantly superior to Example 3 in terms of the feel on the face after application (oily / greasy / fatty), sun protection, duration, protection from sunlight, ultra-matte feel, and oil-free appearance, but was equivalent to Example 2.

[0067] The summarized data shows that all three examples (Examples 1 to 3) according to the present invention are significantly superior to the control samples in sun protection. In the sensory area, Example 1 was the most preferred, followed by Example 2 and Example 3.

[0068] Furthermore, Example B as shown in Table 4 below was prepared, and SPF and UVAPF were measured as described above.

[0069] Table 4

Table 4

[0070] The obtained SPF values and UVAPF values were summarized in Table 5 below.

[0071] Table 5

Table 5

[0072] The data in Table 5 above showed that in the absence of an oil phase thickener, the SPF and UVAPF were much lower than those provided by the compositions of the present invention containing an oil phase thickener (Examples 1 to 3). Also, since this composition showed phase separation after incubation at 45 °C for 3 weeks, it became an unstable composition.

[0073] Furthermore, the compositions according to the present invention shown in Table 6 below (Examples 4 and 5) and comparative compositions (Example C) were prepared, and the SPF, UVAPF and stability of these compositions were measured.

[0074] Table 6

Table 6

[0075] Table 7

Table 7

[0076] The data in Table 7 above showed that when using the oil phase thickener according to the present invention, i.e., the ester of C18 - C36 fatty acids (syncrowax HGLC), a stable gel composition providing high SPF and UVAPF was obtained (Example 4). The data further showed that when using another type of oil phase thickener according to the present invention, i.e., a polymeric oil phase thickener (sorbitol / sebacic acid copolymer behenate, available as Syncrowax® ORM (Example 5)), a stable gel composition with high SPF and UVAPF was obtained. Finally, the data also showed that when using an oil phase thickener not according to the present invention, i.e., carnauba wax and rice bran wax (Sunhancer™ Eco SPF Booster shown in Example D), an unstable composition was obtained.

Claims

1. (i) 0.1 to 25% by weight of an oil-soluble sunscreen; (ii) 0.1 to 5% by weight of a water-soluble sunscreen; (iii) 0.25 to 5% by weight of a polysaccharide gum and one or both of a synthetic polymer selected from ammonium acryloyldimethyltaurate / VP copolymer and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer, a water-phase thickener; (iv) 0.5 to 10% of an ester of C18-C36 fatty acid, an ester of C8-C16 fatty acid, a polymeric oil-phase thickener, and one or more of particles selected from organically modified clay, hydrophobically modified fumed silica, and aerogel, an oil-phase thickener; (v) 0.5 to 15% by weight of a humectant selected from glycerol or glycol; and (vi) 0.5 to 10% by weight of modified starch, silica microspheres, and one or more of polymers of dimethicone / vinyl dimethicone crosspolymer and silica, a sensory modifier A high-SPF gel composition containing the same.

2. The composition according to claim 1, wherein the oil-soluble sunscreen is a UV-B sunscreen selected from one or more of octyl salicylate, 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate, and octyl methoxycinnamate; or a UV-A sunscreen selected from dibenzoylmethane compounds.

3. The composition according to claim 2, containing 0.1 to 5% by weight of an oil-soluble UVA sunscreen agent.

4. The composition according to claim 2 or 3, containing 0.1 to 20% by weight of an oil-soluble UVB sunscreen agent.

5. The composition according to any one of the preceding claims, wherein the water-soluble sunscreen agent is selected from one or both of 2-phenylbenzimidazole-5-sulfonic acid and disodium phenyl dibenzimidazole tetrasulfonate.

6. The composition according to any one of the preceding claims, wherein the polysaccharide gum is xanthan gum.

7. The composition according to any one of the preceding claims, wherein the glycol is selected from one or more of propylene glycol, butylene glycol, and caprylyl glycol.

8. The composition according to any one of the preceding claims, wherein the sensory modifier is selected from one or both of silica microspheres and polymers of dimethicone / vinyl dimethicone crosspolymer and silica.

9. The composition according to any one of the preceding claims, comprising 10 to 70% by weight of water.

10. The composition according to any one of the preceding claims, substantially free of emulsifier.

11. The composition according to any one of the preceding claims, wherein the composition provides at least a sun protection factor (SPF) of 30 in vitro.

12. A method of providing photoprotection with a sun protection factor (SPF) of at least 30, the method comprising the step of applying the composition according to any one of the preceding claims to a desired skin surface.

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