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 suncare formulation. In particular, the present invention relates to 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.

[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 nearly 99% of all adverse effects of sun exposure. For example, high-energy UVB rays are responsible for sunburn, signs of skin aging, and skin cancer. For example, low-energy UVA rays are responsible for direct sunburn and the induction of erythema (abnormal redness) of the skin, contributing to signs 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, the nature of their work makes it difficult to avoid such exposure. Furthermore, some people voluntarily expose their skin to the sun, e.g., to sunburn. Therefore, protection against the harmful effects of the sun is important.

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

[0005] The effectiveness of a given sunscreen formulation is rated 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 of the UV absorbers and UV blockers (such as sunscreen active ingredients) typically used in sunscreen formulations have been reported to have harmful toxic effects and negative sensory effects, which discourage people from using sunscreen.Therefore, it is desirable to reduce the level of sunscreen active ingredients present in sunscreen formulations without reducing SPF protection.Therefore, various SPF boosters have been developed for use in sunscreen formulations to reduce the level of sunscreen active ingredients without reducing the SPF protection provided.It is also desirable for sunscreen formulations to exhibit water resistance and retain sunscreen active ingredients in personal care compositions during use.

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

[0008] The present invention provides an aqueous sun care formulation comprising: Provided is an aqueous suncare formulation comprising a cosmetically acceptable aqueous carrier, a suncare active substance, 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. DETAILED DESCRIPTION OF THE INVENTION

[0009] Surprisingly, it has been found that sulfated microcrystalline cellulose effectively enhances the SPF performance of aqueous sun care formulations while simultaneously thickening the formulations.

[0010] Unless otherwise indicated, ratios, percentages, parts, etc. are by weight.

[0011] The term "aesthetic characteristics" as used herein and in the appended claims with respect to sun care formulations refers to visual and tactile sensory properties (e.g., smoothness, adhesion, lubricity, texture, color, clarity, tubularity, uniformity).

[0012] The term "dermatologically acceptable" as used herein and in the appended claims refers to ingredients typically used for topical application to the skin, and is intended to emphasize that materials that are toxic when present in amounts typically found in skin care compositions are not contemplated as part of the present invention.

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

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

[0015] Preferably, the aqueous sunscreen 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 sunscreen formulation, and the cosmetically acceptable aqueous carrier is selected so that it can evaporate upon application of the aqueous sunscreen formulation to mammalian skin (preferably human skin).

[0016] Preferably, the aqueous suncare formulation of the present invention comprises 20 to 92 wt. % (preferably 30 to 90 wt. %, more preferably 75 to 85 wt. %) of a cosmetically acceptable aqueous carrier, based on the weight of the aqueous suncare formulation. The cosmetically acceptable aqueous carrier may be water (e.g., deionized or distilled water), an emulsion (e.g., an oil-in-water emulsion, a water-in-oil emulsion, a silicone water emulsion, etc.), a mixture of water and an alcohol (e.g., a C 100 alcohol such as ethyl alcohol, propyl alcohol, isopropyl alcohol, or butyl alcohol), or a mixture of water and an alcohol (e.g., a C 100 alcohol such as ethyl alcohol, propyl alcohol, isopropyl alcohol, or butyl alcohol). 1~4 The cosmetically acceptable carrier is selected from the group consisting of: a linear or branched alcohol), a mixture of water and a glycol (e.g., ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, dipropylene glycol, ethoxydiglycol), and a mixture of water, a natural oil, and a mineral oil (e.g., sunflower oil, jojoba oil). More preferably, the personal care formulations of the present invention comprise 20 to 92 wt. % (preferably, 30 to 90 wt. %, more preferably, 75 to 85 wt. %) of a cosmetically acceptable aqueous carrier, based on the weight of the aqueous sun care formulation, and the cosmetically acceptable carrier comprises water (preferably, at least one of deionized water and distilled water, more preferably, deionized water, distilled water).

[0017] Preferably, the aqueous suncare formulation of the present invention comprises a suncare active, more preferably 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 suncare active, based on the weight of the aqueous suncare formulation.Even more preferably, the aqueous suncare formulations of the present invention comprise from 0.1 to 60% by weight (preferably from 1 to 50% by weight, more preferably from 2.5 to 40% by weight, and most preferably from 5 to 10% by weight) of suncare actives, based on the weight of the aqueous suncare formulation, the suncare actives being selected from UV blockers (e.g., red petrolatum, titanium dioxide, zinc oxide) and UV absorbers (e.g., 1-(4-methoxyphenol)-3-(4-tert-butylphenyl)propane-1,3-dione (INCI: avobenzone) ), 2-hydroxy-4-methoxybenzophenone (INCI: Oxybenzone), 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-methionine 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: Octisalate), homomethyl salicylate acrylate, glyceryl aminobenzoate, triethanolamine salicylate, diguaroyl trioleate, lawsone with dihydroxyacetone, 2-phenylbenzimidazole-5-sulfonic acid, 4-methylbenzylidine camphor, avobenzone, triazines, benzotriazoles, vinyl group-containing amides, cinnamic acid amides, sulfonated benzimidazoles, 3,3,5-trimethylcyclohexyl-2-hydroxybenzoate (INCI: Homosalate).Even more preferably, the aqueous suncare formulations of the present invention comprise from 0.1 to 60% (preferably from 1 to 50%, more preferably from 2.5 to 40%, most preferably from 5 to 10%) by weight of suncare active, based on the weight of the aqueous suncare formulation, wherein the suncare active comprises a mixture of UV absorbers. Even more preferably, the aqueous suncare formulations of the present invention comprise from 0.1 to 60% by weight (preferably from 1 to 50% by weight, more preferably from 2.5 to 40% by weight, most preferably from 5 to 10% by weight) of a suncare active, based on the weight of the aqueous suncare formulation, wherein the suncare active 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: octisalate), 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 suncare formulations of the present invention comprise 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 suncare active, based on the weight of the aqueous suncare formulation, the suncare active being 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 suncare formulation of the present invention contains a sulfated microcrystalline cellulose SPF booster. More preferably, the aqueous suncare formulation of the present invention contains 0.5 to 20 wt. % (preferably 1 to 7.5 wt. %, more preferably 1.5 to 5 wt. %, and most preferably 2 to 4 wt. %) of the sulfated microcrystalline cellulose SPF booster based on the weight of the aqueous suncare formulation. Even more preferably, the aqueous suncare formulation of the present invention contains 0.5 to 20 wt. % (preferably 1 to 7.5 wt. %, more preferably 1.5 to 5 wt. %, and most preferably 2 to 4 wt. %) of the sulfated microcrystalline cellulose SPF booster based on the weight of the aqueous suncare formulation, the sulfated microcrystalline cellulose SPF booster having a crystallinity index of 0.20 or more (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, and most preferably 0.4 to 0.85). Even more preferably, the aqueous suncare formulation of the present invention contains 0.5 to 20 wt. % (preferably 1 to 7.5 wt. %, more preferably 1.5 to 5 wt. %, and most preferably 2 to 4 wt. %) of sulfated microcrystalline cellulose SPF booster, based on the weight of the aqueous suncare formulation, the sulfated microcrystalline cellulose SPF booster having a crystallinity index CI of 0.20 or greater (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, and most preferably 0.4 to 0.85). The sulfated microcrystalline cellulose SPF booster has a primary particle needle-like morphology with an average diameter of 1 to 10 nm and an average length of 50 to 300 nm.Most preferably, the aqueous suncare 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, and most preferably 2 to 4% by weight) of a sulfated microcrystalline cellulose SPF booster, based on the weight of the aqueous suncare formulation, the sulfated microcrystalline cellulose SPF booster having a crystallinity index CI of 0.20 or greater (preferably 0.25 to 1, more preferably 0.30 to 0.95, even more preferably 0.35 to 0.90, and most preferably 0.4 to 0.85) (measured as described herein), the sulfated microcrystalline cellulose SPF booster having a primary particle needle-shaped morphology with an average diameter of 1 to 10 nm and an average length of 50 to 300 nm, and the sulfated microcrystalline cellulose SPF booster is spray-dried to agglomerated particles having an average particle size of 1 to 200 μm (preferably 10 to 100 μm) prior to mixing with other aqueous suncare formulation components.

[0019] Preferably, the aqueous suncare formulations of the present invention further comprise optional additives. More preferably, the aqueous suncare formulations of the present invention further comprise optional additives selected from the group consisting of film-forming agents, waterproofing agents, emollients, preservatives, antioxidants, fragrances, moisturizers, rheology modifiers, aesthetic modifiers, vitamins, skin protectants, oils, emulsifiers, surfactants, pearlescent agents, consistency factors, thickeners, superfatting agents, stabilizers, polymers, silicone compounds, fats, waxes, lectins, phospholipids, color components, propellants, and mixtures thereof. Most preferably, the aqueous suncare formulations of the present invention further comprise optional additives, wherein the optional additives include film-forming agents.

[0020] Preferably, the aqueous sunscreen formulation of the present invention further comprises a film-forming agent. More preferably, the aqueous sunscreen formulation of the present invention further comprises 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 that, by itself or in the presence of an auxiliary, forms a macroscopically continuous film on the substrate, in particular on keratin materials (preferably, the film is a coherent film, more preferably, the film exhibits cohesive properties combined with sufficient mechanical properties so that the film can be isolated from the substrate). Most preferably, the aqueous sunscreen formulation of the present invention further comprises 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, the film-forming agent being selected to provide a film barrier upon application of the aqueous sunscreen formulation of the present invention to the skin. The purpose of the film barrier is to help maintain the sunscreen actives on the skin after immersion in water.

[0021] Preferred film-forming agents include petrolatum, emollient esters, lanolin derivatives (e.g., acetylated lanolin), superfattened 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 suncare formulations of the present invention further comprise a film-forming agent, wherein the film-forming agent comprises an acrylate copolymer.

[0022] Acrylic copolymers include acrylamide / acrylic copolymers (e.g., Dermacryl® 79 (INCI: Acrylates / Octacrylamide Copolymer) available from National Starch and Chemical), acrylate copolymers (e.g., epitax™ AC Powdered Water-Resistant Polymer (INCI: Acrylates Copolymer) available from The Dow Chemical Company).

[0023] Certain emollients also exhibit film-forming functionality by providing a water-resistant barrier to the skin. Emollients with film-forming behavior include butyloctyl salicylate (e.g., HallBrite® BHB available from HallStar), fatty acids (e.g., olein, stearin), fatty alcohols (e.g., cetyl, hexadecyl), 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 sunscreen formulation of the present invention is useful for protecting skin. Preferably, the aqueous sunscreen formulation of the present invention is useful for protecting skin from UV damage caused by exposure to sunlight. The aqueous sunscreen formulation of the present invention also preferably provides skin moisturizing, prevention and treatment of dry skin, protection of sensitive skin, improvement of skin tone and texture, masking of blemishes, and suppression of extraepidermal water loss. The aqueous sunscreen formulation of the present invention can be used in a method for protecting skin from UV damage, which comprises topically administering the sunscreen formulation to the skin.

[0025] Preferably, the aqueous suncare formulations of the present invention further comprise a color component. More preferably, the aqueous suncare formulations of the present invention further comprise a color component, the color component being selected from the group consisting of inorganic pigments, organic pigments, aqueous pigment dispersions, and mixtures thereof. Even more preferably, the aqueous sun care formulation of the present invention further comprises a color component, the color component being selected from the group consisting of 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. 34, D&C Red No. 35, D&C Red No. 36, D&C Red No. 37, D&C Red No. 38, D&C Red No. 39, D&C Red No. 40, D&C Yellow No. 41, D&C Yellow No. 42, D&C Red No. 43, D&C Red No. 44, D&C Red No. 45, D&C Red No. 46, D&C Red No. 47, D&C Red No. 48, D&C Red No. 49, D&C Red No. 50, D&C Red No. 51, D&C Red No. 52, D&C Red No. 53, D&C Red No. 54, D&C Red No. 55, D&C Red No. 56, D&C Red No. 5 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 green , chromium oxide green , copper chlorophyllin, copper powder, dihydroxyacetone, ferric ammonium ferrocyanide, Preferably, the aqueous sunscreen formulation of the present invention further comprises a color component selected from the group consisting of iron ferrocyanide, guanine, iron oxide, manganese violet, mica, silver, titanium dioxide, ultramarine blue, zinc oxide, and mixtures thereof. Even more preferably, the aqueous sunscreen formulation of the present invention further comprises a color component, the color component comprising at least one iron oxide. Most preferably, the aqueous sunscreen formulation of the present invention further comprises a color component, the color component comprising a mixture of iron oxides.

[0026] Preferably, the aqueous suncare formulation of the present invention further comprises a color component, wherein the color component is a pigment. More preferably, the aqueous suncare formulation of the present invention further comprises a color component, wherein the color component is a pigment, and the pigment has been surface-treated. Even more preferably, the aqueous suncare formulation of the present invention further comprises a color component, wherein the color component is a pigment, and the pigment has been surface-treated, wherein the surface treatment is formed through treatment of 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 suncare formulation of the present invention further comprises a color component, wherein the color component is a pigment, and the pigment has been surface-treated, wherein the surface treatment is formed through treatment of the pigment with a surface treatment agent selected from the group consisting of sodium perfluorohexylethylphosphonate, triethoxycaprylylsilane, perfluorooctyltriethoxysilane, and mixtures thereof.

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

[0028] Aqueous silicone emulsion-based emulsifiers for use in cosmetically acceptable aqueous carriers include Lauryl PEG-10 Tris(trimethylsiloxy)silylethyl) Dimethicone, Diglyceryl Tris(Trimethylsiloxy)silylethyl Dimethicone, grafted block or block copolymers (comprising at least one block of polyorganosiloxane type and at least one block of polyether). The polyorganopolysiloxane block is in particular polydimethylsiloxane or poly(C2~8 ) alkylmethyl siloxane, and the polyether blocks can be poly(oxy(C2-C8) alkylene, especially polyoxyethylene and / or polyoxypropylene. These can be linear, rake, or graft type materials, or ABA type, where B is the siloxane polymer block and A is the poly(oxyalkylene) group. The poly(oxyalkylene) group can consist of polyethylene oxide, polypropylene oxide, or mixed polyethylene oxide / polypropylene oxide groups. Other oxides, such as butylene oxide or phenylene oxide, are also possible. Another type of silicone polyether composition that can be included in the present composition is the ABn polyalkylene oxide silicone copolymers.

[0029] Emulsifiers for use in cosmetically acceptable aqueous carriers based on aqueous O / W emulsions include oxyethylenated and / or oxypropylenated ethers of glycerol (which may contain 1 to 150 oxyethylene and / or oxypropylene groups), fatty alcohols (especially C 8~24 , preferably C 12~18 Oxyethylenated and / or oxypropylenated ethers of cetearyl alcohol (which may contain 1 to 150 oxyethylene and / or oxypropylene groups), such as oxyethylenated cetearyl alcohol ether (CTFA name Ceteareth-30) containing 30 oxyethylene groups, and C containing 7 oxyethylene groups. 12~15 Oxyethylated ethers of aliphatic alcohol mixtures (CTFA name C 12~15 Pareth-7), fatty acid esters of polyethylene glycol (which may contain 1 to 150 ethylene glycol units) (especially C 8~24 , preferably C 16~22 of fatty acids), for example PEG-50 stearate and PEG-40 monostearate, fatty acid esters of oxyethylenated and / or oxypropylenated glyceryl ethers (which may contain 1 to 150 oxyethylene and / or oxypropylene groups) (in particular C 8~24 , preferably C 16~22of fatty acids), such as 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 oxyethylenated and / or oxypropylenated sorbitol ethers (which may contain 1 to 150 oxyethylene and / or oxypropylene groups), in particular C 8~24 , preferably C 16~22 of hydroxybenzoates), 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 of acids), in particular those of glycerol or sorbitol, such as glyceryl stearate, glyceryl stearate, glyceryl laurate, polyglyceryl-2 stearate, sorbitan tristearate, or glyceryl ricinoleate.

[0030] Preferred propellants for use in the aqueous suncare formulations 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 suncare formulations of the present invention have a pH of 4 to 9. More preferably, the aqueous suncare formulations of the present invention have a pH of 4.5 to 8.5. Even more preferably, the aqueous suncare formulations of the present invention have a pH of 5.0 to 8.0. Most preferably, the aqueous suncare formulations of the present invention have a pH of 5.5 to 7.5.

[0032] Preferably, the personal care formulations of the present invention are provided in a product form selected from the group consisting of a cream, an aqueous solution, an oil, an ointment, a paste, a gel, a lotion, a milk, a foam, a stick, and a suspension.

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

[0034] The aqueous sunscreen formulations of the present invention are useful for at least one of treating (e.g., moisturizing; protecting against the harmful effects of sun exposure) and enhancing the appearance of skin through application to the skin. Preferably, the aqueous sunscreen formulations of the present invention are easily applied to the skin.

[0035] Some embodiments of the present invention are described in detail in the following examples.

[0036] crystallinity index The 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. Samples were analyzed by cobalt K diffractometry from a sealed source tube operated at 40 kV and 44 mA. a The XRD data were collected from 5° to 75° with a step size of 0.02° and a collection time of 5° / min. Analysis of the obtained X-ray diffraction patterns was performed using JADE2010 X-ray pattern analysis software. The crystallinity index = (I 200 -I am ) / (I 200 ) wherein I 200 is the peak intensity of the (200) lattice diffraction, and I am is the peak intensity of the amorphous domain diffraction.

[0037] Comparative Examples SC1 to SC3 and Examples S1 to S3: Sunscreen Formulations Aqueous sunscreen formulations were prepared for each of Comparative Examples SC1-SC3 and Examples S1-S3 having the formulations set forth in Table 1.

[0038] The Phase A components of each of Comparative Examples SC1-SC3 and Example S1 were mixed at 75°C with gentle agitation until dissolved. The Phase B components were mixed together in a separate container at 75°C. The mixed Phase B components were then slowly added into the mixed Phase A components. The Phase C components were then added to the mixed Phase A and B components. The mixture was then coated at 40°C with continued agitation. The Phase D components were then mixed at high shear. The resulting formulation was then 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 measurements. The in vitro SPF performance of each of the aqueous sun care formulations was then tested in triplicate using in vitro techniques according to the following protocol:

[0041] The substrates used for the in vitro SPF measurements were roughened PMMA substrates (6 μm-HD6 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, each at a concentration of 1.3 mg / cm. 2 The resulting sunscreen provided a uniform layer of sunscreen formulation on the surface of the PMMA substrate at a rate of 1 / 2000 sq. m / s. Each deposited layer of the aqueous sunscreen formulation was allowed to stand for 14 weeks under ambient conditions in the laboratory. After 1, 2, 9, and 14 weeks of heat aging at 45°C, the UV absorbance of each dried layer of the aqueous sunscreen formulation was measured at nine separate points at 290 nm and 400 nm using a Labsphere UV-2000S spectrometer. The SPF boost efficiency was then calculated for each of (MFC)SC2, (SunSpheres™ Powder)SC3, and (CNC)S1 relative to the booster-free control formulation SC1 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 measurements. The in vitro SPF performance of each of the aqueous sun care formulations was then tested in triplicate using an in vitro technique according to the following protocol: The substrates used for the in vitro SPF measurements were roughened PMMA substrates (6 μm-HD6 available from Schonberg GMBH & Co. KG). The aqueous sun care formulation to be tested was each applied to three separate roughened PMMA substrates using a gloved finger, with 1.3 mg / cm2 applied. 2 A uniform layer of sunscreen formulation was provided on the surface of the PMMA substrate at a rate of 100 μm. Each deposited layer of aqueous sunscreen formulation was allowed to dry for at least 60 minutes under ambient laboratory conditions before SPF measurements. The UV absorbance of each dried layer of the aqueous sunscreen formulation was measured at nine separate points at 290 nm and 400 nm using a Labsphere UV-2000S spectrometer. An in vitro SPF value was then calculated for each aqueous sunscreen formulation prepared according to Comparative Example SC1 and Examples S1-S3 based on the results of the UV absorption measurements. The average of three samples of each aqueous sunscreen formulation prepared according to Comparative Example SC1 and Examples S1-S3 is reported in Table 3.

[0045] [Table 3]

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

[0047] [Table 4]

Claims

1. 1. An aqueous sun care formulation comprising: 20 to 92 weight percent of a cosmetically acceptable aqueous carrier, based on the weight of the aqueous sun care formulation; 0.1 to 60 wt. % of a suncare active, based on the weight of the aqueous suncare formulation; 0.5 to 20% by weight of a sulfated microcrystalline cellulose SPF booster, based on the weight of the aqueous sun care formulation; 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. The aqueous suncare formulation of claim 2, wherein the suncare active is selected from the group consisting of UV blockers and UV absorbers.

4. The sun care active may be 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 paradimethylaminobenzoate, octyl paradimethylaminobenzoate, ethyl 4-bis(hydroxypropyl) para-aminobenzoate, polyethylene glycol (PEG-25) para-aminobenzoate, ethyl 4-bis(hydroxypropyl)aminobenzoate, diethanolamine para-methyoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, ethylhexyl para-methoxycinnamate, octyl paramethoxycinnamate, iodopropanol, methylparaben ...

4. The aqueous suncare formulation of claim 3, wherein the hydroxybenzoates are selected from the group consisting of soybean para-methoxycinnamate, 2-ethylhexyl-2-cyano-3,3-diphenyl-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-containing amides, cinnamic acid amides, sulfonated benzimidazoles), 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate, and mixtures thereof.

5. 5. The aqueous suncare formulation of claim 4, 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.

6. 6. The aqueous suncare formulation of claim 5, further comprising a film former.

7. 7. The aqueous suncare formulation of claim 6, wherein the film former comprises an acrylate copolymer and the suncare active comprises a mixture of UV absorbers.

8. 8. The aqueous suncare formulation of claim 7, further comprising a color component.

9. 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 8, 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 green, chromium oxide green, copper chlorophyllin, copper powder, dihydroxyacetone, ferric ammonium ferrocyanide, ferric ferrocyanide, guanine, iron oxide, manganese violet, mica, silver, titanium dioxide, ultramarine blue, zinc oxide, and mixtures thereof.

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