Aqueous Suncase formulations based on sulfated crystalline cellulose SPF booster

Abstract

Provided is an aqueous suncare formulation comprising a cosmetically acceptable aqueous carrier, a suncare active, and a sulfated microcrystalline cellulose SPF booster, wherein the sulfated microcrystalline cellulose SPF booster enhances the SPF of the aqueous suncare formulation and thickens the aqueous suncare formulation.

Description

[Technical Field]

[0001] The present invention relates to an aqueous sun care formulation. In particular, the present invention relates to an aqueous sun care formulation comprising a cosmetically acceptable aqueous carrier, a sun care active substance, and a sulfated crystalline cellulose SPF booster, wherein the sulfated crystalline cellulose SPF booster promotes the SPF of the aqueous sun care formulation and thickens the aqueous sun care formulation.

[0002] The harmful effects of sunlight on human skin are well documented. Six percent of the solar energy reaching the Earth's surface is ultraviolet (UV) radiation with wavelengths between 290 and 400 nm. This radiation is divided into two components: (i) low-energy UVA rays with wavelengths between 320 and 400 nm, and (ii) high-energy UVB rays with wavelengths between 290 and 320 nm. Although the UV portion of solar energy is relatively small, it induces almost 99% of all side effects from sun exposure. For example, high-energy UVB rays cause sunburn, the appearance of skin aging, and skin cancer. For example, low-energy UVA rays cause direct sunburn and erythema (abnormal redness) of the skin, and contribute to the appearance of skin aging.

[0003] By avoiding direct exposure to sunlight, individuals can avoid the serious effects caused by exposure to UV radiation. However, for some people, avoiding such exposure is difficult due to the nature of their work. Furthermore, some people voluntarily expose their skin to the sun, for example, to get a tan. Therefore, protection from the harmful effects of the sun is important.

[0004] Protection from the harmful effects of UV radiation exposure is available in the form of topical formulations containing at least one UV blocker, at least one UV absorber, or a combination thereof. UV blockers contain active ingredients such as titanium dioxide, zinc oxide, and red petrolatum. UV absorbers contain active ingredients such as para-aminobenzoic acid (more commonly known as PABA), which are generally transparent upon application, become active by absorbing UV radiation, and provide selective protection against certain UV wavelengths depending on the absorption spectrum of the active ingredients in the formulation.

[0005] The effectiveness of a given sunscreen formulation is evaluated by how well it protects the skin, in terms of its Sun Protection Factor (SPF), which is defined as the ratio of the amount of energy required to produce minimal erythema on sunscreen-protected skin to the amount of energy required to produce the same level of erythema on unprotected skin.

[0006] Some UV absorbers and UV blockers (e.g., sun care active ingredients) commonly used in sunscreen formulations have been reported to have harmful toxic and negative sensory effects that may discourage people from using sunscreen. Therefore, it is desirable to reduce the level of sun care active ingredients present in sunscreen formulations without reducing SPF protection. Accordingly, various SPF boosters have been developed for use in sun care formulations to reduce the level of sun care active ingredients without reducing the SPF protection provided. It is also desirable that sunscreen formulations exhibit water resistance and retention of sun care active ingredients within the personal care composition during use.

[0007] Therefore, there remains a need for new sun care formulations that provide effective SPF assessment while reducing the required level of sun care active ingredients, and exhibit water resistance and retention of sun care active ingredients.

[0008] The present invention is an aqueous sun care formulation, The present invention provides an aqueous sun care formulation comprising a cosmetically acceptable aqueous carrier, a sun care active substance, and a sulfated crystalline cellulose SPF booster, wherein the sulfated crystalline cellulose SPF booster promotes the SPF of the aqueous sun care formulation and thickens the aqueous sun care formulation. [Modes for carrying out the invention]

[0009] Surprisingly, we found that sulfated crystalline cellulose effectively enhances the SPF performance of aqueous sunscreen formulations while simultaneously thickening them.

[0010] Unless otherwise specified, ratios, percentages, and parts are expressed by weight.

[0011] With respect to sun care formulations, the term “aesthetic features” as used herein and in the appended claims refers to visual and tactile sensory characteristics (e.g., smoothness, stickiness, lubricity, texture, color, clarity, tubularity, uniformity).

[0012] As used herein and in the appendices, the term “dermatologically acceptable” refers to ingredients typically used for topical application to the skin, and it is intended to emphasize that materials that are toxic when present in amounts typically found in skincare compositions are not intended as part of the present invention.

[0013] Preferably, the aqueous sun care formulation of the present invention comprises a cosmetically acceptable aqueous carrier (preferably, the aqueous sun care formulation contains 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier based on the weight of the aqueous sun care formulation), a sun care active substance (preferably, the aqueous sun care formulation contains 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of a sun care active substance based on the weight of the aqueous sun care formulation), and a sulfated crystalline cellulose SPF booster (preferably, the aqueous sun care formulation contains 0.5 to 20% by weight (preferably 1 to 7.5% by weight, more preferably 1.5 to 5% by weight, most preferably 2 to 4% by weight) of sulfated crystalline cellulose SPF booster based on the weight of the aqueous sun care formulation), wherein the sulfated crystalline cellulose SPF booster promotes the SPF of the aqueous sun care formulation and thickens the aqueous sun care formulation.

[0014] Preferably, the aqueous sun care formulation of the present invention comprises a cosmetically acceptable aqueous carrier. More preferably, the aqueous sun care formulation of the present invention comprises 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier based on the weight of the aqueous sun care formulation. Most preferably, the personal care formulation of the present invention comprises 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier based on the weight of the aqueous sun care formulation, wherein the sun care active substance and sulfated crystalline cellulose SPF booster are dispersed in the cosmetically acceptable carrier.

[0015] Preferably, the aqueous sun care formulation of the present invention comprises 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier, based on the weight of the aqueous sun care formulation, wherein the cosmetically acceptable aqueous carrier is selected to evaporate upon application of the aqueous sun care formulation to mammalian skin (preferably human skin).

[0016] Preferably, the aqueous sun care formulation of the present invention comprises 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier based on the weight of the aqueous sun care formulation, wherein the cosmetically acceptable aqueous carrier is water (e.g., deionized, distilled water), emulsion (e.g., oil-in-water emulsion, water-in-oil emulsion, silicone aqueous emulsion, etc.), or a mixture of water and alcohol (e.g., ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, etc.). 1~4 The following are selected from the group consisting of linear or branched alcohols, mixtures of water and glycols (e.g., ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, dipropylene glycol, ethoxydiglycol), and mixtures of water and natural oils and mineral oils (e.g., sunflower oil, jojoba oil). More preferably, the personal care formulation of the present invention comprises 20 to 92% by weight (preferably 30 to 90% by weight, more preferably 75 to 85% by weight) of a cosmetically acceptable aqueous carrier based on the weight of the aqueous sun care formulation, wherein the cosmetically acceptable carrier comprises water (preferably at least one of deionized water and distilled water, more preferably deionized water and distilled water).

[0017] Preferably, the aqueous sun care formulation of the present invention contains a sun care active substance. More preferably, the aqueous sun care formulation of the present invention contains 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of the sun care active substance based on the weight of the aqueous sun care formulation.More preferably, the aqueous sun care formulation of the present invention contains 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of a sun care active substance based on the weight of the aqueous sun care formulation, wherein the sun care active substance is a UV blocker (e.g., red petrolatum, titanium dioxide, zinc oxide) and a UV absorber (e.g., 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione (INCI: avobenzone) ), 2-hydroxy-4-methoxybenzophenone (INCI: oxybenzone), dioxybenzone, surisobenzone, menthyl anthranilate, para-aminobenzoic acid, amyl para-dimethylaminobenzoic acid, octyl para-dimethylaminobenzoate, ethyl 4-bis(hydroxypropyl) para-aminobenzoate, polyethylene glycol (PEG-25) para-aminobenzoate, ethyl 4-bis(hydroxypropyl) aminobenzoate, diethanolamine para-methio Xycinnamate, 2-ethoxyethyl para-methoxycinnamate, ethylhexyl para-methoxycinnamate, octyl para-methoxycinnamate, isoamyl para-methoxycinnamate, 2-ethylhexyl-2-cyano-3,3-diphenyl-acrylate, 2-ethylhexyl-2-cyano-3,3-diphenyl-2-propenoate (INCI: octocrylene), 2-ethylhexyl salicylate (INCI: octysalate), homomethyl salicylate The group is selected from the following: phosphate, glycerylaminobenzoate, triethanolamine salicylate, diguaroyl triolate, lawsone containing dihydroxyacetone, 2-phenylbenzimidazole-5-sulfonic acid, 4-methylbenzyridin camphor, avobenzone, triazine, benzotriazole, vinyl group-containing amide, cinnamic acid amide, sulfonated benzimidazole, and 3,3,5-trimethylcyclohexyl-2-hydroxybenzoate (INCI: homosalate).More preferably, the aqueous sun care formulation of the present invention comprises 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of a sun care active substance based on the weight of the aqueous sun care formulation, wherein the sun care active substance comprises a mixture of UV absorbers. More preferably, the aqueous sun care formulation of the present invention comprises 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of a sun care active substance based on the weight of the aqueous sun care formulation, wherein the sun care active substance is a mixture of UV absorbers comprising at least one of 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione (INCI: avobenzone), 2-ethylhexyl 2-hydroxybenzoate (INCI: octisalete), 2-ethylhexyl-2-cyano-3,3-diphenyl-2-propenoate (INCI: octocrylene), 3,3,5-trimethylcyclohexyl-2-hydroxybenzoate (INCI: homosalate), and 2-hydroxy-4-methoxybenzophenone (INCI: oxybenzone). Most preferably, the sun care formulation of the present invention comprises 0.1 to 60% by weight (preferably 1 to 50% by weight, more preferably 2.5 to 40% by weight, most preferably 5 to 10% by weight) of a sun care active substance based on the weight of the aqueous sun care formulation, wherein the sun care active substance is a mixture of UV absorbers comprising 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione (INCI: avobenzone), 2-ethylhexyl-2-cyano-3,3-diphenyl-2-propenoate (INCI: octocrylene), and 3,3,5-trimethylcyclohexyl-2-hydroxybenzoate (INCI: homosalate).

[0018] Preferably, the aqueous sun care formulation of the present invention contains a sulfated crystalline cellulose SPF booster. More preferably, the aqueous sun care formulation of the present invention contains 0.5 to 20% by weight (preferably 1 to 7.5% by weight, more preferably 1.5 to 5% by weight, most preferably 2 to 4% by weight) of sulfated crystalline cellulose SPF booster based on the weight of the aqueous sun care formulation. Even more preferably, the aqueous sun care formulation of the present invention contains 0.5 to 20% by weight (preferably 1 to 7.5% by weight, more preferably 1.5 to 5% by weight, most preferably 2 to 4% by weight) of sulfated crystalline cellulose SPF booster based on the weight of the aqueous sun care formulation, wherein the sulfated crystalline cellulose SPF booster has a crystallinity index of 0.20 or higher (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, most preferably 0.4 to 0.85). More preferably, the aqueous sun care formulation of the present invention comprises 0.5 to 20% by weight (preferably 1 to 7.5% by weight, more preferably 1.5 to 5% by weight, most preferably 2 to 4% by weight) of sulfated crystalline cellulose SPF booster based on the weight of the aqueous sun care formulation, wherein the sulfated crystalline cellulose SPF booster has a crystallinity index CI of 0.20 or higher (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, most preferably 0.4 to 0.85). The sulfated crystalline cellulose SPF booster has a primary particle needle shape with an average diameter of 1 to 10 nm and an average length of 50 to 300 nm.Most preferably, the aqueous sun care formulation of the present invention comprises 0.5 to 20% by weight (preferably 1 to 7.5% by weight, more preferably 1.5 to 5% by weight, most preferably 2 to 4% by weight) of sulfated crystalline cellulose SPF booster based on the weight of the aqueous sun care formulation, wherein the sulfated crystalline cellulose SPF booster has a crystallinity index CI of 0.20 or higher (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, most preferably 0.4 to 0.85) (measured as described herein), the sulfated crystalline cellulose SPF booster has a primary particle needle shape with an average diameter of 1 to 10 nm and an average length of 50 to 300 nm, and the sulfated crystalline cellulose SPF booster is spray-dried into aggregated particles having an average particle size of 1 to 200 μm (preferably 10 to 100 μm) before being mixed with other aqueous sun care formulation components.

[0019] Preferably, the aqueous sun care formulation of the present invention further comprises an optional additive. More preferably, the aqueous sun care formulation of the present invention further comprises an optional additive, the optional additive being selected from the group consisting of film-forming agents, waterproofing agents, emollients, preservatives, antioxidants, fragrances, humectants, rheology modifiers, aesthetic modifiers, vitamins, skin protectants, oils, emulsifiers, surfactants, pearlescent agents, consistency factors, thickeners, superfatizers, stabilizers, polymers, silicone compounds, fats, waxes, lectins, phospholipids, color components, propellants, and mixtures thereof. Most preferably, the aqueous sun care formulation of the present invention further comprises an optional additive, the optional additive being a film-forming agent.

[0020] Preferably, the aqueous sunscreen preparation of the present invention further contains a film-forming agent. More preferably, the aqueous sunscreen preparation of the present invention further contains 0.5 to 7% by weight (preferably 0.6 to 5% by weight, more preferably 0.75 to 4% by weight) of a film-forming agent, and the film-forming agent forms a macroscopically continuous film on a support, particularly on a keratin material, either by itself or in the presence of an adjuvant (preferably, the film is a cohesive film, and more preferably, the film exhibits cohesive properties combined with sufficient mechanical properties so that the film can be isolated from the support). Most preferably, the aqueous sunscreen preparation of the present invention further contains 0.5 to 7% by weight (preferably 0.6 to 5% by weight, more preferably 0.75 to 4% by weight) of a film-forming agent, and the film-forming agent is selected to provide a film barrier when the aqueous sunscreen preparation of the present invention is applied to the skin. The purpose of the film barrier is to help maintain the sunscreen active substance on the skin after immersion in water.

[0021] Preferred film-forming agents include petrolatum, skin-softening agent esters, lanolin derivatives (e.g., acetylated lanolin), superfatty oils, silicone gums, silicone resins, phenyl-functionalized silicones, silicone acrylates, dimethicone derivatives, natural and synthetic oils, fatty acids, fatty alcohols, waxes, acrylic copolymers, polyamides, polyesters, polysaccharides, acrylate polymers, and mixtures thereof. Preferably, the aqueous sunscreen preparation of the present invention further contains a film-forming agent, and the film-forming agent contains an acrylate copolymer.

[0022] Examples of acrylate copolymers include acrylamide / acrylic copolymers (e.g., Dermacryl® 79 (INCI: acrylate / octacrylamide copolymer) available from National Starch and Chemical), acrylate copolymers (e.g., epitax® AC powder water-resistant polymer (INCI: acrylate copolymer) available from The Dow Chemical Company).

[0023] In addition, certain skin softeners exhibit a film-forming function by providing a water-resistant barrier to the skin. Examples of skin softeners having a film-forming behavior include butyl octyl salicylate (e.g., HallBrite® BHB available from HallStar), fatty acids (e.g., oleic acid, stearic acid), fatty alcohols (e.g., cetyl alcohol, hexadecyl alcohol), esters (e.g., 2,2-dimethyl-1,3-propanediyl diheptanoate (INCI: neopentyl glycol diheptanoate)), alkanes (e.g., mineral oil), ethers (e.g., polyoxypropylene butyl ether, polyoxypropylene cetyl ether), natural oils and synthetic oils (including silicone oils).

[0024] The aqueous sun care formulation of the present invention is useful for protecting the skin. Preferably, the aqueous sun care formulation of the present invention is useful for protecting the skin from UV damage caused by exposure to sunlight. The aqueous sun care formulation of the present invention also preferably provides moisturization to the skin, prevention and treatment of dry skin, protection of sensitive skin, improvement of skin tone and texture, masking of blemishes, and suppression of transepidermal water loss. The aqueous sun care formulation of the present invention can be used in a method for protecting the skin from UV damage, which includes topically administering the sun care formulation to the skin.

[0025] Preferably, the aqueous sun care formulation of the present invention further comprises a color component. More preferably, the aqueous sun care formulation of the present invention further comprises a color component selected from the group consisting of inorganic pigments, organic pigments, aqueous pigment dispersions, and mixtures thereof. More preferably, the aqueous sun care formulation of the present invention further contains color components, the color components being Ext.D&C Yellow No.2, Ext.D&C Violet No.2, FD&C Red No.4, FD&C Red No.40, FD&C Yellow No.5, FD&C Yellow No.6, FD&C Green No.3, FD&C Blue No.1, D&C Yellow No.7, D&C Yellow No.8, D&C Yellow No.10, D&C Yellow No.11, D&C Violet No.2, D&C Red No.6, D&C Red No.7, D&C Red No.17, D&C Red No.21, D&C Red No.22, D&C Red No.27, D&C Red No.28, D&C Red No.30, D&C Red No.31, D&C Red No.34, D&C Red No.33, D&C Red The following are selected from the group consisting of No. 36, D&C Green No. 5, D&C Green No. 6, D&C Green No. 8, D&C Blue No. 4, D&C Orange No. 4, D&C Orange No. 5, D&C Orange No. 10, D&C Orange No. 11, D&C Brown No. 1, aluminum powder, annatto, bismuth citrate, bismuth oxychloride, bronze powder, caramel, carmine, β-carotene, chromium hydroxide, chromium oxide, copper chlorophyllin, copper powder, dihydroxyacetone, iron ferrocyanide, guanine, iron oxide, manganese violet, mica, silver, titanium dioxide, ultramarine, zinc oxide, and mixtures thereof. More preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component comprising at least one iron oxide. Most preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component comprising a mixture of iron oxides.

[0026] Preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component being a pigment. More preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component being a pigment, and the pigment being surface-treated. Even more preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component being a pigment, and the pigment being surface-treated, the surface treatment being formed by treating the pigment with a surface treatment agent selected from the group consisting of alkylsilanes, halogenated phosphonates, halogenated organosilanes, or combinations thereof. Most preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component being a pigment, and the pigment being surface-treated, the surface treatment being formed by treating the pigment with a surface treatment agent selected from the group consisting of sodium p-fluorohexylethylphosphonate, triethoxycaprylylsilane, perfluorooctyltriethoxysilane, and mixtures thereof.

[0027] Rheology modifiers for use in the aqueous sun care formulations of the present invention include dispersions (e.g., acrylate / steareth-20 methacrylate copolymer), crosslinked acrylamide polymers and copolymers (e.g., Sepigel 305, carbomer), xanthan gum, water-soluble cellulose thickeners, guar gum, hydroxyethylcellulose, carob gum, scleroglucan gum, gelling agent gum, carrageenan gum, arginate, maltodextrin, starch, and their derivatives, as well as mixtures thereof.

[0028] Examples of emulsifiers for use in aqueous silicone emulsion-type cosmetically acceptable aqueous carriers include Lauryl PEG-10 Tris(trimethylsiloxy)silylethyl)Dimethicone, Diglyceryl Tris(Trimethylsiloxy)silylethylDimethicone, and grafted blocks or block copolymers (containing at least one block of polyorganosiloxane type and at least one block of polyether). Polyorganopolysiloxane blocks are particularly polydimethylsiloxane or poly(C) 2~8) It can be an alkylmethylsiloxane, and the polyether block can be poly(oxy(C2-C8)alkylene), especially polyoxyethylene and / or polyoxypropylene. These can be linear, rake-shaped or graft-shaped substances, or of the ABA type, where B is a siloxane polymer block and A is a poly(oxyalkylene) group. The poly(oxyalkylene) group can consist of polyethylene oxide, polypropylene oxide, or a mixed polyethylene oxide / polypropylene oxide group. Other oxides such as butylene oxide or phenylene oxide are also possible. Another type of silicone-polyether composition that can be contained in the present composition is an ABn polyalkylene oxide silicone copolymer.

[0029] As an emulsifier for use in an aqueous O / W emulsion-based cosmetically acceptable aqueous carrier, there are ethoxylated and / or propoxylated ethers of glycerol (which may contain 1 to 150 oxyethylene and / or oxypropylene groups), ethoxylated and / or propoxylated ethers of aliphatic alcohols (especially C 8~24 , preferably C 12~18 alcohols) (which may contain 1 to 150 oxyethylene groups and / or oxypropylene groups), for example, ethoxylated ceteareth ether containing 30 oxyethylene groups (CTFA name ceteareth-30), and ethoxylated ether of a mixture of C 12~15 aliphatic alcohols containing 7 oxyethylene groups (CTFA name C 12~15 pareth-7), fatty acid esters of polyethylene glycol (which may contain 1 to 150 ethylene glycol units) (especially those of C 8~24 , preferably those of C 16~22 acids), for example, PEG-50 stearate and PEG-40 monostearate, fatty acid esters of ethoxylated and / or propoxylated glyceryl ethers (which may contain 1 to 150 oxyethylene groups and / or oxypropylene groups) (especially those of C 8~24 , preferably those of C 16~22Acidic substances), for example, PEG-200 glyceryl monostearate, polyethoxylated glyceryl stearate having 30 ethylene oxide groups, polyethoxylated glyceryl oleate having 30 ethylene oxide groups, polyethoxylated glyceryl cocoate having 30 ethylene oxide groups, polyethoxylated glyceryl isostearate having 30 ethylene oxide groups, and polyethoxylated glyceryl laurate having 30 ethylene oxide groups, fatty acid esters of oxyethylenelated and / or oxypropylenelated sorbitol ether (which may contain 1 to 150 oxyethylene groups and / or oxypropylene groups) (especially C 8~24 Preferably C 16~22 Acidic compounds), dimethicone copolyols, dimethicone copolyol benzoates, copolymers of propylene oxide and ethylene oxide (also known as EO / PO polycondensates), and mixtures thereof, sugar esters and ethers, such as sucrose stearate, sucrose cocoate and sorbitan stearate, and mixtures thereof, fatty acid esters of polyols (especially C 8~24 Preferably C 16~22 Acidic substances, particularly those containing glycerol or sorbitol, include, for example, glyceryl stearate, glyceryl laurate, polyglyceryl-2 stearate, sorbitan tristearate, or glyceryl ricinoleate.

[0030] Preferred propellants for use in the aqueous sun care formulation of the present invention include methane, ethane, propane, isobutane, n-butane, dimethyl ether, diethyl ether, fluoro-containing materials (e.g., 1,1-difluoroethane, ethyl perfluoroisobutyl ether, ethyl perfluorobutyl ether, methyl perfluoroisobutyl ether, methyl perfluorobutyl ether), and mixtures thereof. Preferred fluorine-containing propellants include Cosmetic Fluid CF-76 (INCI name: ethyl perfluorobutyl ether / ethyl perfluoroisobutyl ether) and Cosmetic Fluid CF-61 (INCI name: methyl perfluorobutyl ether / methyl perfluoroisobutyl ether).

[0031] Preferably, the aqueous sun care formulation of the present invention has a pH of 4 to 9. More preferably, the aqueous sun care formulation of the present invention has a pH of 4.5 to 8.5. Even more preferably, the aqueous sun care formulation of the present invention has a pH of 5.0 to 8.0. Most preferably, the aqueous sun care formulation of the present invention has a pH of 5.5 to 7.5.

[0032] Preferably, the personal care formulation of the present invention is provided in a product form selected from the group consisting of creams, aqueous solutions, oils, ointments, pastes, gels, lotions, milks, foams, sticks, and suspensions.

[0033] Optionally, the aqueous sun care formulations of the present invention may be formulated for application to the skin by using a mechanical device (e.g., a manual pump spray container, a squeeze bottle) to form a spray, or a pressurized aerosol container (e.g., a bag-on nozzle container, a pressurized can).

[0034] The aqueous sun care formulation of the present invention is useful for at least one of the following: treatment (e.g., moisturizing; protection from the harmful effects of sun exposure) and enhancing the appearance of the skin through application to the skin. Preferably, the aqueous sun care formulation of the present invention is easily applied to the skin.

[0035] Several embodiments of the present invention will be described in detail in the following examples.

[0036] crystallinity index The degree of crystallinity index CI (values ​​reported in Table 1 for sulfated crystalline cellulose and microfibrillated cellulose) was obtained as follows. Diffraction patterns were collected using a Rigaku SmartLab 3kW X-ray diffractometer equipped with a Hypix3000 detector. The sample was subjected to cobalt K from a sealed source tube operated at 40kV and 44mA. a The investigation was conducted using radiation (l=1.541Å). XRD data was collected from 5° to 75°2q with a step size of 0.02° and an acquisition time of 5° / min. The obtained X-ray diffraction patterns were analyzed using JADE2010 X-ray pattern analysis software. Crystallinity index = (I 200 -I am ) / (I 200 ) and in the formula, I 200 This is the peak intensity of (200) lattice diffraction, and I am This represents the peak intensity of amorphous domain diffraction.

[0037] Comparative Examples SC1-SC3 and Examples S1-S3: Sunscreen Formulations Aqueous sunscreen formulations were prepared using Comparative Examples SC1-SC3 and Examples S1-S3, each of which had formulations described in Table 1.

[0038] The components of Phase A of Comparative Examples SC1-SC3 and Example S1 were mixed at 75°C with gentle stirring until dissolved. The components of Phase B were mixed together in a separate container at 75°C. Then, the mixed Phase B components were slowly added to the mixed Phase A components. Next, the components of Phase C were added to the mixed Phase A and B components. The mixture was then coated at 40°C with continued stirring. Next, the components of Phase D were mixed under high shear. Finally, the resulting formulation was homogenized for 3 minutes.

[0039] [Table 1]

[0040] In vitro SPF measurement The aqueous sun care formulations prepared according to Comparative Examples SC1-SC3 and Example S1 were each allowed to settle for one week before in vitro SPF measurement. Subsequently, the in vitro SPF performance of each aqueous sun care formulation was tested three times using in vitro technology according to the following protocol.

[0041] The substrate used for in vitro SPF measurement was a roughened PMMA substrate (6μm-HD6 is available from Schonberg GmbH & Co. KG). The aqueous sun care formulation to be tested was applied to three separate roughened PMMA substrates using a gloved finger, at a concentration of 1.3 mg / cm². 2 A uniform layer of the sun care formulation was provided on the surface of the PMMA substrate at a rate of . Each deposited layer of the aqueous sun care formulation was left to stand in the laboratory under ambient conditions for 14 weeks. After thermal aging at 45°C for 1, 2, 9, and 14 weeks, the UV absorption of each dry layer of the aqueous sun care formulation at 290 nm and 400 nm was measured at nine separate points using a Labsphere UV-2000S spectrometer. The SPF boost efficiency was then calculated for each of the booster-free control formulations SC1, (MFC)SC2, (SunSpheres® powder)SC3, and (CNC)S1, using the following formula.

[0042]

number

[0043] [Table 2]

[0044] The aqueous sun care formulations prepared according to Comparative Example SC1 and Examples S1-S3 were each allowed to settle for one week before in vitro SPF measurement. The in vitro SPF performance of each aqueous sun care formulation was then tested three times using in vitro techniques according to the following protocol. The substrate used for in vitro SPF measurement was a roughened PMMA substrate (6μm-HD6 is available from Schonberg GmbH & Co. KG). The aqueous sun care formulation to be tested was applied to three separate roughened PMMA substrates using a gloved finger, at a concentration of 1.3 mg / cm³. 2 A uniform layer of the sun care formulation was applied to the surface of the PMMA substrate at a certain rate. Each deposited layer of the aqueous sun care formulation was dried for at least 60 minutes under ambient laboratory conditions before SPF measurement. The UV absorption of each dried layer of the aqueous sun care formulation at 290 nm and 400 nm was measured at nine separate points using a Labsphere UV-2000S spectrometer. The in vitro SPF value was then calculated for each aqueous sun care formulation prepared according to Comparative Example SC1 and Examples S1-S3 based on the results of the UV absorption measurement. The average of three samples of each aqueous sun care formulation prepared according to Comparative Example SC1 and Examples S1-S3 is reported in Table 3.

[0045] [Table 3]

[0046] viscosity Next, the Brookfield viscosity of the aqueous sun care formulations prepared according to Comparative Examples SC1 and SC3 and Example S1 was measured at 30 rpm using a TA Instruments DHR-3 rheometer equipped with an aluminum cup and bob. The results are shown in Table 4.

[0047] [Table 4]

Claims

1. 1. An aqueous sun care formulation comprising: a cosmetically acceptable aqueous carrier; sun care actives; a sulfated microcrystalline cellulose SPF booster; An aqueous suncare formulation, wherein the sulfated microcrystalline cellulose SPF booster enhances the SPF of the aqueous suncare formulation and thickens the aqueous suncare formulation.

2. 10. The aqueous suncare formulation of claim 1, wherein the sulfated microcrystalline cellulose SPF booster has a crystallinity index of 0.20 or greater.

3. 3. An aqueous suncare formulation according to claim 2, wherein the sulfated microcrystalline cellulose SPF booster is spray dried with an agregate particle size of 1 to 200 μm.

4. 4. The aqueous suncare formulation of claim 3, wherein the suncare active is selected from the group consisting of UV blockers and UV absorbers.

5. The sun care actives include red petrolatum, titanium dioxide, zinc oxide, 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione, 2-hydroxy-4-methoxybenzophenone, dioxybenzone, sulisobenzone, menthyl anthranilate, para-aminobenzoic acid, amyl para-dimethylaminobenzoate, octyl para-dimethylaminobenzoate, ethyl 4-bis(hydroxypropyl) para-aminobenzoate, polyethylene glycol (PEG-25) para-aminobenzoate, ethyl 4-bis(hydroxypropyl)aminobenzoate, diethanolamine para-methyoxycinnamate, 2-ethoxyethyl para-methoxycinnamate, ethylhexyl para-methoxycinnamate, octyl para-methoxycinnamate, isoamyl para-methoxycinnamate, 2-ethylhexyl-2-cyano-3,3-diphenylmethane 5. The aqueous suncare formulation of claim 4, wherein the hydroxybenzoates are selected from the group consisting of benzotriazole, benzophenone, benzophenone-2-acrylate, 2-ethylhexyl-2-cyano-3,3-diphenyl-2-propenoate, 2-ethylhexyl-2-hydroxybenzoate, homomethyl salicylate, glyceryl aminobenzoate, triethanolamine salicylate, diguaroyl trioleate, lawsone with dihydroxyacetone, 2-phenylbenzimidazole-5-sulfonic acid, 4-methylbenzimidazole camphor, avobenzone, triazines, benzotriazoles, vinyl group-containing amides, cinnamic acid amides, sulfonated benzimidazoles), 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate, and mixtures thereof.

6. 6. The aqueous suncare formulation of claim 5, wherein the suncare active is a mixture of UV absorbers comprising 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione, 2-ethylhexyl 2-hydroxybenzoate, 2-ethylhexyl-2-cyano-3,3-diphenyl-2-propenoate, 3,3,5-trimethylcyclohexyl-2-hydroxybenzoate, and 2-hydroxy-4-methoxybenzophenone.

7. 7. The aqueous sun care formulation of claim 6, further comprising a film former.

8. 8. The aqueous suncare formulation of claim 7, wherein the film former comprises an acrylate copolymer and the suncare active comprises a mixture of UV absorbers.

9. 9. The aqueous suncare formulation of claim 8, further comprising a color component.

10. The color components are Ext. D&C Yellow No. 2, Ext. D & C Violet No. 2.FD&C Red No. 4.FD&C Red No. 40, FD&C Yellow No. 5.FD&C Yellow No. 6.FD&C Green No. 3.FD&C Blue No.

1. D&C Yellow No.

7. D&C Yellow No.

8. D&C Yellow No. 10, D&C Yellow No.

11. D&C Violet No.

2. D&C Red No.

6. D&C Red No.

7. D&C Red No. 17, D&C Red No. 21, D&C Red No. 22, D&C Red No. 27, D&C Red No. 28, D&C Red No. 30, D&C Red No. 31, D&C Red No. 34, D&C Red No. 33, D&C Red No. 36, D&C Green No.

5. D&C Green No.

6. D&C Green No.

8. D&C Blue No.

4. D&C Orange No.

10. The aqueous suncare formulation of claim 9, wherein the active ingredient is selected from the group consisting of D&C Orange No. 4, D&C Orange No. 5, D&C Orange No. 10, D&C Orange No. 11, D&C Brown No. 1, aluminum powder, annatto, bismuth citrate, bismuth oxychloride, bronze powder, caramel, carmine, beta-carotene, chromium hydroxide, chromium oxide, copper chlorophyllin, copper powder, dihydroxyacetone, ferric ferrocyanide, guanine, iron oxide, manganese violet, mica, silver, titanium dioxide, ultramarine, zinc oxide, and mixtures thereof.

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