Sunscreen double gel composition, method of making and use thereof

Abstract

The present invention provides a dual gel composition, a cosmetic prepared by using the composition in the form of an oil-in-water dual gel, and a method for preparing the composition and the use of the composition for preparing a cosmetic, particularly a sunscreen cosmetic. The composition comprises a dual gel structure of an aqueous phase gel and an oil phase gel, wherein the composition comprises the following components: (1) a (C1-C2 alkyl)acrylate / C10-C30 alkyl (C1-C2 alkyl)acrylate copolymer as an aqueous phase thickening agent; (2) an oil phase thickening agent comprising one or more selected from the group consisting of: (i) celluloses; (ii) dextrin / inulin fatty acid esters; (iii) glutamic acid and derivatives thereof; (iv) eicosanedioic acid and derivatives thereof; (v) polyamides; (vi) isophorone diisocyanate (IPDI) copolymers or sebacic acid copolymers; (vii) crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylol hexyl lactone; (viii) hydroxystearic acid and derivatives thereof; (ix) polybutenes; (x) waxes; (xi) sorbitol esters; and (xii) sucrose fatty acid esters; (3) a polyglycerol emulsifier having an HLB value of 0 to 8; and (4) a solvent.

Description

Technical Field

[0001] This invention relates to the field of cosmetics, specifically to a dual-gel composition, its preparation method, and its use in the preparation of cosmetics, particularly sunscreen cosmetics. This invention also relates to a sunscreen composition. Background Technology

[0002] As consumer demand for cosmetics and personal care products becomes increasingly diversified, developing multifunctional products has become a research hotspot in the cosmetics industry. For example, for sunscreen cosmetics, consumers expect products to have high efficacy, good SPF (e.g., SPF 50 and above), a lightweight, water-repellent feel, and also high requirements for water and sweat resistance.

[0003] However, it presents a significant challenge for existing sunscreens to simultaneously meet all of these requirements, especially regarding SPF value and skin feel. Among the sunscreens currently on the market, lightweight or water-based products generally have relatively low SPF values ​​when tested according to Chinese testing methods, while products with higher SPF values ​​often have a sticky feel.

[0004] For example, traditional gels and emulsions, as single systems, cannot simultaneously meet the aforementioned multiple requirements. Gels are lightweight and watery, but their capacity to hold oils and powder particles (e.g., organic and inorganic UV filters) is relatively weak, posing a significant challenge in terms of SPF values. Emulsions, being dispersions of two immiscible liquids, present a considerable challenge in terms of stability and skin feel. In sunscreen formulations, achieving high SPF values ​​often requires the addition of large amounts of polar organic and inorganic UV filters, which significantly impact the stability and user experience of the emulsion. Therefore, conventional emulsions always require the addition of large amounts of emulsifiers and thickeners, resulting in a thermodynamically stable emulsion system, but with a very sticky feel.

[0005] Therefore, it remains desirable to provide a composition that can be used to prepare cosmetics, particularly sunscreen cosmetics, which provide good stability and water resistance as well as a high SPF value, while also having a lighter, water-repellent feel on the skin.

[0006] Daily exposure to sunlight can cause various types of damage to the skin due to ultraviolet (UV) radiation, including erythema, sunburn, and photoaging, and also increases the risk of skin cancer. Therefore, sunscreen products, as a core means of UV protection, have always received significant attention within the industry. Existing sunscreen products typically rely on organic or inorganic UV filters to absorb, scatter, or reflect long-wave and medium-wave UV rays. However, most sunscreen formulas suffer from insufficient UV stability during actual use due to their inherent structural instability and the unavoidable UV-induced photodegradation.

[0007] Existing research attempts to improve photostability by adding additives such as photostability stabilizers, antioxidants, and encapsulated sunscreens, or by using microencapsulation technology or improving film-forming materials. However, these methods still have limitations to varying degrees. For example, photostability stabilizers affect skin feel, encapsulation materials cause formulation compatibility issues, strong film-forming agents affect the skin feel experience, or lead to increased costs, making it difficult to widely apply them in products. In addition, in actual use, UV stability is affected by multiple factors such as UV intensity, skin microenvironment, sweat / sebum, and friction, making it difficult to ensure long-term stability of protective performance in various scenarios.

[0008] Therefore, there is an urgent need for a novel sunscreen composition or method for preparing such a composition that can more effectively improve the UV stability of sunscreen agents, enhance the structural stability of sunscreen films, and ensure long-term, reliable UV protection in various usage scenarios. Summary of the Invention

[0009] This invention was made in view of the above-mentioned problems existing in the prior art.

[0010] In a first aspect, the present invention provides a bigel composition having a bigel structure comprising an aqueous phase gel and an oil phase gel, wherein the composition comprises the following components: (1) A (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous gel; (2) An oil-phase gel comprising one or more substances selected from the group consisting of: (i) cellulose; (ii) dextrin / inulin fatty acid esters; (iii) glutamic acid and its derivatives; (iv) eicosanoic acid and its derivatives; (v) polyamides; (vi) isophorone diisocyanate (IPDI) copolymers or sebacic acid copolymers; (vii) crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionic acid; (viii) hydroxystearic acid and its derivatives; (ix) polybutene; (x) waxes; (xi) sorbitan esters; and (xii) sucrose fatty acid esters; (3) A polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; and (4) Solvent.

[0011] In one embodiment, the composition is a bigel structure comprising a continuous aqueous phase gel and a dispersed oil phase gel.

[0012] In one embodiment, the continuous aqueous gel comprises an aqueous thickener, and the dispersed oil gel comprises an oil thickener.

[0013] In one embodiment, the average particle size of the dispersed oil phase gel is 0.1-50 μm.

[0014] In one embodiment, the composition, when observed under a polarized light microscope, exhibits a bigel structure with a continuous aqueous phase and a gel-dispersed oil phase.

[0015] In one embodiment, the dual gel structure is an oil-in-water dual gel structure.

[0016] In one embodiment, the composition exhibits improved UV stability under UV irradiation.

[0017] In one embodiment, the continuous aqueous gel and the dispersed oil gel are physically combined to form a bigel structure.

[0018] In one specific embodiment of the above-described dual-gel composition, under ultraviolet irradiation conditions, the SPF loss rate of the composition is not higher than 5%, and preferably negative.

[0019] In one specific embodiment of the above-described dual-gel composition, wherein: The cellulose class includes ethyl cellulose; The dextrin / inulin fatty acid ester is selected from one or more substances from the group consisting of dextrin palmitate and stearoyl inulin. The glutamic acid and its derivatives are selected from one or more substances from the group consisting of: dibutyllauroyl glutamine and dibutylethylhexanoyl glutamine; The eicosanoic acid and its derivatives are selected from one or more substances in the group consisting of: glycerol tris(behenic acid / isostearate / eicosanoic acid) ester, glycerol behenic acid ester / eicosanoic acid ester; The polyamide is selected from one or more substances from the group consisting of polyamide-8 and polyamide-3; The isophorone diisocyanate (IPDI) copolymer or sebacic acid copolymer is selected from one or more of the group consisting of castor oil / IPDI copolymer and hydrogenated castor oil / sebacic acid copolymer; The crosslinked polymer containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionate is selected from one or more of the group consisting of: caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), and HDI / trimethylolpropionate crosslinked polymer. The hydroxystearic acid and its derivatives are selected from one or more substances from the group consisting of: trihydroxystearin, 9-hydroxystearic acid, 10-hydroxystearic acid and 12-hydroxystearic acid; The polybutene is preferably one or more of the polybutenes with a kinematic viscosity of 11-45000 centistokes as determined by ASTM D445A at 100°C. The wax is selected from one or more substances from the group consisting of: paraffin wax, microcrystalline wax, ceresin wax, synthetic wax, polyethylene, triglyceride, and glyceryl behenate. The sucrose fatty acid ester is obtained by esterification of sucrose with fatty acids, preferably C12–C22, including saturated and mono / polyunsaturated fatty acids. The HLB value is controlled by the degree of fatty acid substitution; in this invention, the preferred HLB value is 1–8, selected from one or more substances grouped from the group consisting of: sucrose stearate, sucrose palmitate, sucrose laurate, and sucrose oleate; and The sorbitol ester includes sorbitan olive oil ester, preferably comprising one or more selected from the group consisting of sorbitan olive oil ester and dextrin palmitate, more preferably comprising one or more selected from sorbitan olive oil ester and dextrin palmitate, and even more preferably comprising or being dextrin palmitate.

[0020] In one specific embodiment of the above-described dual-gel composition, the content of the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is 0.05-5.00% by weight, preferably 0.05-2.00% by weight, more preferably 0.05-1.00% by weight, based on the total weight of the composition.

[0021] In one specific embodiment of the above-described dual-gel composition, the content of the oil phase thickener is 0.10-15.00% by weight, preferably 0.50-10.00% by weight, more preferably 1.00-5.00% by weight, based on the total weight of the composition.

[0022] In one specific embodiment of the above-described dual-gel composition, the oil phase thickener comprises or is a dextrin / inulin fatty acid ester, preferably dextrin palmitate, and the content of the dextrin / inulin fatty acid ester is 0.10-15.00% by weight, preferably 0.50-10.00% by weight, more preferably 1.00-4.00% by weight, based on the total weight of the composition.

[0023] In one specific embodiment of the above-described dual-gel composition, the oil phase thickener comprises or is sorbitan ester, preferably sorbitan olive oil ester, and the content of sorbitan ester is 0.10-4.00% by weight, preferably 0.50-3.00% by weight, more preferably 2-3% by weight, based on the total weight of the composition.

[0024] In one specific embodiment of the above-described dual-gel composition, the oil phase thickener comprises or is polybutene and sorbitan olive oil ester, preferably with a polybutene content of 0.10-4.00% by weight, more preferably 0.50-3.00% by weight, and a sorbitan olive oil ester content of 0.10-4.00% by weight, more preferably 0.50-3.00% by weight, based on the total weight of the composition.

[0025] In one specific embodiment of the above-described dual-gel composition, the oil phase thickener comprises or is sorbitan olive oil ester and dextrin palmitate, preferably 0.10-4.00% by weight, more preferably 0.50-3.00% by weight, and 0.10-10.00% by weight, more preferably 0.20-5.00% by weight, based on the total weight of the composition.

[0026] In one specific embodiment of the above-described dual-gel composition, the content of the polyglycerol emulsifier is 0.01-8.00% by weight, preferably 0.50-4.00% by weight, more preferably 0.50-2.00% by weight, based on the total weight of the composition.

[0027] In one specific embodiment of the above-described dual-gel composition, the solvent content is 30.0-99.8% by weight, preferably 40.0-80.0% by weight, based on the total weight of the composition.

[0028] In one specific embodiment of the above-described bigel composition, the solvent comprises water and a hydrophobic solvent, wherein the water content is preferably 20-80% by weight, more preferably 30-70% by weight, and the hydrophobic solvent content is preferably 0.5-20% by weight, more preferably 1-10% by weight, based on the total weight of the composition.

[0029] In one specific embodiment of the above-described bigel composition, the hydrophobic solvent is one or more selected from the group consisting of: a) Esters of saturated and / or unsaturated, branched and / or unbranched alkane carboxylic acids with a chain length of 3-30 carbon atoms, and saturated and / or unsaturated, branched and / or unbranched alcohols with a chain length of 3-30 carbon atoms. b) Esters of aromatic carboxylic acids with saturated and / or unsaturated, branched and / or unbranched alcohols with chain lengths of 3–30 carbon atoms. c) Alkyl benzoate, d) Lecithin and fatty acid triglycerides, namely saturated and / or unsaturated, branched and / or unbranched triglycerides of alkyl carboxylic acids with a chain length of 8-24 carbon atoms. e) Dialkyl ethers and dialkyl carbonates, f) Saturated or unsaturated, branched or unbranched alcohols, and g) Alkyl esters of amino acids, especially alkyl esters of lauroyl sarcosine, such as isopropyl lauroyl sarcosine.

[0030] In one specific embodiment of the above-described dual-gel composition, it further comprises a UV filter, preferably an organic UV filter and an inorganic UV filter. The organic UV filter is preferably one or more selected from the group consisting of: Alkyl alkoxycinnamic acid esters such as C1-C10 alkoxycinnamic acid, C2-C10 alkyl esters, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, 3-benzylene camphor, 4-methylbenzylene camphor, benzophenone-3, butylmethoxydibenzoylmethane, diethylhexylbutamidotriazinone, dimethylPABA ethylhexyl ester, ethylhexyl methoxycinnamic acid, ethylhexyl salicylate, ethylhexyl triazinone, and humulone. Amyl methoxycinnamate, methylene bisbenzotriazolyl tetramethylbutylphenol, octocrylene, PEG-25 p-aminobenzoic acid, polyacrylamide methyl benzyl camphor, polysiloxane-15, benzophenone-4, benzophenone-5, benzyl camphor sulfonic acid and its salts, camphor benzalkonium methyl sulfate, disodium phenyl dibenzimidazole tetrasulfonate, phenyl benzimazole sulfonic acid and its potassium, sodium and triethanolamine salts, terephthalimide dicamphor sulfonic acid and its salts. The inorganic UV filter is preferably one or more selected from the group consisting of: Pigments formed from metal oxides, such as titanium dioxide, zinc oxide, iron oxide, zirconium oxide, or cerium oxide, preferably titanium dioxide and zinc oxide, and more preferably oleophilic treated titanium dioxide. The UV filter content is preferably 0.1-30.0% by weight, more preferably 15.0-25.0% by weight, based on the total weight of the composition.

[0031] In one specific embodiment of the above-described bigel composition, it further comprises a neutralizing agent containing a basic group, the neutralizing agent being one or more selected from the group consisting of: arginine, sodium hydroxide, potassium hydroxide, sodium citrate, triethanolamine, tromethamine, aminomethylpropanol, preferably arginine, triethanolamine, tromethamine, aminomethylpropanol, more preferably arginine, and particularly the content of the neutralizing agent is 0.01-5.00% by weight, preferably 0.05-1.00% by weight, based on the total weight of the composition.

[0032] In one specific embodiment of the above-described dual-gel composition, it further comprises one or more components selected from the group consisting of: Ascorbic acid and its derivatives, such as ascorbic acid tetraisopalmitate, L-ascorbic acid 2-glucoside, and vitamin C; Resorcinol and its derivatives; enzymes; Moisturizers, such as hyaluronic acid and its salts, protein hydrolysates, and polyols, such as butylene glycol, propylene glycol, glycerol, dipropylene glycol, diglycerides, etc. Polyethylene glycol; Recombinant collagen; Natural extracts; Anti-inflammatory agents; Oligomeric proanthocyanidins; Vitamins, such as vitamin A (retinol), vitamin E (tocopherol), vitamin B5 (panthenol), vitamin B3 (nicotinamide), derivatives of these vitamins (especially esters), and mixtures thereof; Resveratrol; BHT; Ceramides; and Ceramide-like substances; Esters of amino acids, such as myristoylmethyl β-alanine (phytosterol / decyltetradecyl) ester; Cholesterol and its derivatives, such as 7-dehydrocholesterol; Steroids; Urea; caffeine; Depigmenting agents such as kojic acid, hydroquinone, and caffeic acid; Salicylic acid and its derivatives; α-Hydroxy acids, such as lactic acid and glycolic acid and their derivatives; Vitamin A-like substances, such as carotenoids and vitamin A derivatives; Hydrocortisone; Melatonin; Extracts of algae, fungi, plants, yeasts, and bacteria, such as licorice extract, including potassium glycyrrhizate, glycyrrhizin, glycyrrhetinic acid, glycyrrhizin chalcone, etc. Antimicrobial agents, such as 2,4,4'-trichloro-2'-hydroxydiphenyl ether (or triclosan), 3,4,4'-trichlorocarbazide (or triclocarban) and the acids mentioned above, and especially salicylic acid and its derivatives; Matting agents, such as those used in fibers; Tensioner.

[0033] In one specific embodiment of the above-described bigel composition, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer comprises structural units derived from the following monomers: 95.9 to 98.8% by weight of an olefinic unsaturated carboxylic acid monomer, wherein the olefinic unsaturated carboxylic acid monomer is one or more selected from the group consisting of acrylic acid, methacrylic acid and ethylacrylic acid; 1 to 3.5% by weight of acrylate compounds having the following structural formula,

[0034] Where R is an alkyl group containing 10 to 30 carbon atoms, and R1 is hydrogen, methyl, or ethyl; and Optionally, 0.1 to 0.6% by weight of a crosslinking agent, such as an alkenyl ether of a polyol and / or a (C1-C2 alkyl) acrylate, each molecule of which contains two or more polymerizable alkenyl groups and / or (C1-C2 alkyl) acrylate groups, wherein the polyol contains at least three carbon atoms and at least two hydroxyl groups, for example at least three hydroxyl groups, said polyol being, for example, an alkylene polyol or an alkylene polyol epoxyalkane adduct.

[0035] In one specific embodiment of the above-described dual-gel composition, the aqueous phase thickener is an aqueous phase emulsifying thickener, and / or the oil phase thickener is an oil phase emulsifying thickener.

[0036] In one specific embodiment of the above-mentioned dual-gel composition, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is a crosslinked copolymer.

[0037] In one specific embodiment of the above-described dual-gel composition, it comprises the following components: (1) 0.05-5.00% by weight, preferably 0.05-2.00% by weight, more preferably 0.05-1.00% by weight of (C1-C2 alkyl) acrylic acid / (C1-C2 alkyl) acrylic acid C10-C30 alkyl ester copolymer, preferably (C1-C2 alkyl) acrylic acid / acrylic acid C10-C30 alkyl ester crosslinked copolymer; (2) 0.10-10.00% by weight, preferably 0.20-5.00% by weight of dextrin palmitate; (3) Optional 0.10-4.00% by weight, preferably 0.50-3.00% by weight of sorbitan oleate; (4) Optional 0.10-4.00% by weight, preferably 0.50-3.00% by weight of polybutene; (5) 0.01-8.00% by weight, preferably 0.50-4.00% by weight, more preferably 0.50-2.00% by weight, of a polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; (6) Optional 0.1-30.0% by weight, more preferably 15.0-25.0% by weight of UV filter; (7) Arginine, optionally 0.01-5.00% by weight, preferably 0.05-1.00% by weight; (8) 0.5-20% by weight, preferably 1-10% by weight, of a hydrophobic solvent; (9) 20-80% by weight, preferably 30-70% by weight of water.

[0038] In one specific embodiment of the above-described dual-gel composition, it is used in cosmetic compositions, particularly sunscreen compositions.

[0039] In one specific embodiment of the above-described dual-gel composition, polyacrylate crosspolymer-6 is also included.

[0040] In one specific embodiment of the above-described dual-gel composition, the weight ratio of the (C1-C2 alkyl) acrylate / C10-C30 alkyl acrylate crosslinker copolymer to the polyacrylate crosslinker-6 is 0.3:1 to 8:1, preferably 0.3:1 to 2:1, more preferably 0.3:1 to 1:1, for example, 0.35:1 to 8:1, 0.35:1 to 6:1, 0.35:1 to 2:1, 0.35:1 to 1:1, 0.375:1 to 8:1. :1, 0.375:1 to 6:1, 0.375:1 to 2:1, 0.375:1 to 1:1, 2:1 to 8:1, or 1:1 to 2:1, or any range between 0.3:1 and 8:1; or 0.3:1, 0.35:1, 0.375:1, 0.4:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, or any ratio between 0.3:1 and 8:1.

[0041] In one specific embodiment of the above-described dual-gel composition, the amount of polyacrylate crosspolymer-6 added is 0.05 to 2.00% by weight, preferably 0.05 to 1.00% by weight, and more preferably 0.05 to 0.8% by weight, based on the total weight of the composition.

[0042] In one specific embodiment of the above-mentioned dual-gel composition, it further includes a UV filter, preferably an inorganic UV filter, and most preferably a combination of inorganic and organic UV filters.

[0043] In one specific embodiment of the above-described dual-gel composition, the amount of UV filter added is 0.1 to 30.0% by weight, preferably 15.0 to 25.0% by weight, based on the total weight of the composition.

[0044] In one specific embodiment of the above-described dual-gel composition, it further includes a light-stabilizing enhancer, preferably a water-soluble polar solvent, more preferably one or more selected from the group consisting of polyol derivatives, polyether compounds and polyethylene glycols (PEGs), and even more preferably polyethylene glycols with a molecular weight <700.

[0045] In one specific embodiment of the above-described dual-gel composition, the amount of the light-stabilizing enhancer added is 0.05-10% by weight, preferably 0.5-5.0% by weight, more preferably 1.0-5.0% by weight, based on the total weight of the composition.

[0046] The inventors discovered that by selecting specific aqueous phase thickeners (i.e., component (1)), specific oil phase thickeners (i.e., component (2)), polyglycerol emulsifiers with specific HLB values ​​(i.e., component (3)) and solvents and combining them to form an oil-in-water dual gel, it is possible to obtain cosmetic compositions that simultaneously possess good stability, good waterproof and sweat-resistant properties, excellent SPF effect, and improved refreshing and water-repellent skin feel.

[0047] In a second aspect, the present invention provides a method for preparing a composition according to the first aspect, comprising the following steps: i) Mix water, (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, and optionally a neutralizing agent to obtain the aqueous phase composition; ii) Mixing the oil-phase thickener, polyglycerol emulsifier, and optionally a hydrophobic solvent, optionally an oil-soluble active ingredient, and / or optionally a UV filter, yields the oil-phase composition; and iii) Add the oil phase component to the aqueous phase component and mix to obtain the composition.

[0048] In one specific embodiment, the method for preparing the above-mentioned bigel composition further includes the following steps: iv) Based on step iii), polyacrylate crosslinking polymer-6 is further added to obtain a bigel composition with good UV stability.

[0049] In a third aspect, the present invention provides the use of the bigel composition of the present invention in the preparation of cosmetics, particularly sunscreen cosmetics. In a third aspect, the present invention provides the use of the composition according to the first aspect or the composition prepared by the method according to the second aspect in the preparation of cosmetics, particularly sunscreen cosmetics.

[0050] In a specific embodiment of the use of the dual-gel composition in the preparation of cosmetics, the sunscreen cosmetic comprises a UV filter, preferably an inorganic UV filter, and most preferably a combination of inorganic and organic UV filters.

[0051] In a fourth aspect, the present invention provides a sunscreen composition comprising the following components: (1) (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous thickener; (2) Polyacrylate crosspolymer-6; (3) Oil phase thickener; (4) A polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; (5) UV filter; (6) Solvent.

[0052] In one specific embodiment of the above sunscreen composition, the UV filter includes an inorganic UV filter, and most preferably a combination of inorganic and organic UV filters.

[0053] In one specific embodiment of the above sunscreen composition, it further includes (7) a photostable enhancer, preferably a water-soluble polar solvent, more preferably one or more selected from the group consisting of polyol derivatives, polyether compounds and polyethylene glycols (PEGs), and even more preferably polyethylene glycols with a molecular weight <700.

[0054] In one specific embodiment of the above sunscreen composition, the oil phase thickener comprises one or more substances selected from the group consisting of: (i) cellulose; (ii) dextrin / inulin fatty acid esters; (iii) glutamic acid and its derivatives; (iv) eicosanoic acid and its derivatives; (v) polyamides; (vi) isophorone diisocyanate (IPDI) copolymers or sebacic acid copolymers; (vii) crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionic acid; (viii) hydroxystearic acid and its derivatives; (ix) polybutene; (x) waxes; (xi) sorbitan esters; and (xii) sucrose fatty acid esters.

[0055] In one specific embodiment of the above sunscreen composition, wherein: The cellulose class includes ethyl cellulose; The dextrin / inulin fatty acid ester is selected from one or more substances from the group consisting of dextrin palmitate and stearoyl inulin. The glutamic acid and its derivatives are selected from one or more substances from the group consisting of: dibutyllauroyl glutamine and dibutylethylhexanoyl glutamine; The eicosanoic acid and its derivatives are selected from one or more substances in the group consisting of: glycerol tris(behenic acid / isostearate / eicosanoic acid) ester, glycerol behenic acid ester / eicosanoic acid ester; The polyamide is selected from one or more substances from the group consisting of polyamide-8 and polyamide-3; The isophorone diisocyanate (IPDI) copolymer or sebacic acid copolymer is selected from one or more of the group consisting of castor oil / IPDI copolymer and hydrogenated castor oil / sebacic acid copolymer; The crosslinked polymer containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionate is selected from one or more of the group consisting of: caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), and HDI / trimethylolpropionate crosslinked polymer. The hydroxystearic acid and its derivatives are selected from one or more substances from the group consisting of: trihydroxystearin, 9-hydroxystearic acid, 10-hydroxystearic acid and 12-hydroxystearic acid; The polybutene is preferably polybutene with a kinematic viscosity of 11-45000 centistokes as determined by ASTM D445A at 100°C. The wax is selected from one or more substances from the group consisting of: paraffin wax, microcrystalline wax, ceresin wax, synthetic wax, polyethylene, triglyceride, and glyceryl behenate. The sucrose fatty acid ester is obtained by esterification of sucrose with fatty acids, preferably C12–C22, including saturated and mono / polyunsaturated fatty acids. The HLB value is controlled by the degree of fatty acid substitution; in this invention, the preferred HLB value is 1–8, selected from one or more substances grouped from the group consisting of: sucrose stearate, sucrose palmitate, sucrose laurate, and sucrose oleate; and The sorbitol ester includes sorbitan olive oil ester, preferably comprising one or more selected from the group consisting of sorbitan olive oil ester and dextrin palmitate, more preferably comprising one or more selected from the group consisting of sorbitan olive oil ester and dextrin palmitate, and even more preferably comprising or being dextrin palmitate.

[0056] The inventors discovered that by selecting specific aqueous phase thickeners (i.e., component (2)), specific oil phase thickeners (i.e., component (3)), polyglycerol emulsifiers with specific HLB values ​​(i.e., component (4)), UV filters (i.e., component (5)), solvents (i.e., component (6)) and combining them together, an unstable bicontinuous phase bigel structure is formed (see comparative examples B and C).

[0057] By selecting specific aqueous thickeners (i.e., component (1)), specific oil thickeners (i.e., component (3)), polyglycerol emulsifiers with specific HLB values ​​(i.e., component (4)), UV filters (i.e., component (5)), and solvents (i.e., component (6)) and combining them, a stable water-in-oil dual-gel system is formed (see Comparative Example A). By selecting specific aqueous thickeners (i.e., components (1) and (2)), specific oil thickeners (i.e., component (3)), polyglycerol emulsifiers with specific HLB values ​​(i.e., component (4)), UV filters (i.e., component (5)), and solvents (i.e., component (6)) and combining them, not only can a stable water-in-oil dual-gel be formed, but its UV protection loss rate is also greatly reduced. At this time, a water-in-oil dual-gel with stable structure and good UV stability is obtained (see Examples A, B, C, D, E, F, G, H, I).

[0058] Furthermore, when light-stabilizing enhancers (e.g., polyethylene glycols with a molecular weight <700) are added, water-in-oil dual gels with stable structure and good UV stability can be obtained. Attached Figure Description

[0059] To more clearly illustrate the technical solution of the present invention, the accompanying drawings required for describing the embodiments will be briefly described below. It should be understood that these drawings are only for the purpose of facilitating a better understanding of the present invention by those skilled in the art, and are not intended to limit the scope of the present invention.

[0060] Figures 1A to 1I Microscopic images (left image: normal light; middle image: polarized light) of the compositions of Examples 1-4 and Comparative Examples 1-5 are shown, as well as observations of the visual appearance of the mixtures obtained by mixing with dyes (right image).

[0061] Figure 2A Images showing, from left to right, depict the visual appearance of the compositions of Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, Example 2, Example 3, Example 4, Comparative Example 4, and Comparative Example 5 after storage at 50°C for 4 weeks.

[0062] Figure 2B Enlarged images of the visual appearance of the compositions of Comparative Examples 2, 3, and 5 after storage at 50°C for 4 weeks are shown from left to right.

[0063] Figure 3 The water resistance test results of each composition are shown. The three pictures in the first row correspond to the compositions of Example 1, Comparative Example 4, and Comparative Example 5 from left to right, respectively. The three pictures in the second row correspond to the compositions of Comparative Examples 1-3 from left to right, respectively. The three pictures in the third row correspond to the compositions of Examples 2-4 from left to right, respectively.

[0064] Figure 4 The images show the observation results of the appearance of each composition after application. The five pictures in the first row, from left to right, correspond to the compositions of Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 5, respectively. The four pictures in the second row, from left to right, correspond to the compositions of Example 2, Example 3, Example 4, and Comparative Example 4, respectively.

[0065] Figure 5 Microscopic images of the composition of Comparative Example A are shown (left image: normal light; right image: polarized light).

[0066] Figure 6 Microscopic images of the composition of Comparative Example B are shown (left image: normal light; right image: polarized light).

[0067] Figure 7 The images show actual photos of Comparative Examples A and B after one week of placement (Comparative Example A is on the left; Comparative Example B is on the right).

[0068] Figure 8 Microscopic images of the composition of Example D are shown (left image: normal light; right image: polarized light). Detailed Implementation

[0069] To make the inventive objectives, technical solutions, and beneficial technical effects of this application clearer, this application will be described in detail below. It should be noted that the various aspects, features, embodiments, and advantages described in this application can be compatible and / or combined together.

[0070] Unless otherwise specified, the technical terms used in this specification have the same meaning as commonly understood by those skilled in the art.

[0071] As used herein, the term "(C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer" refers to a copolymer obtained by copolymerizing (C1-C2 alkyl)acrylic acid with (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester. This copolymer can be a copolymer of both (C1-C2 alkyl)acrylic acid and (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester, but it can also be a copolymer of these two with other monomeric raw materials capable of copolymerization therewith, provided that the resulting copolymer has an aqueous thickening effect, preferably an aqueous emulsifying thickening effect. The copolymer can be a crosslinked copolymer or a non-crosslinked copolymer. In the case of a crosslinked copolymer, crosslinking can be achieved by adding a crosslinking agent during copolymerization or by irradiating the copolymer.

[0072] In this application, the term "(C1-C2 alkyl)acrylic acid" means acrylic acid, methacrylic acid, ethylacrylic acid, or a combination thereof. The term "(C1-C2 meth)acrylic acid C10-C30 alkyl ester" is similarly interpreted. In this application, the term "(C1-C2 alkyl)acrylic acid" is sometimes simply referred to as "(alkyl)acrylic acid," and "(C1-C2 meth)acrylic acid C10-C30 alkyl ester" is also simply referred to as "(meth)acrylic acid C10-C30 alkyl ester." The term "acrylate compound" encompasses both acrylates and (alkyl)acrylates.

[0073] In this application, the term "dextrin / inulin fatty acid ester" means dextrin fatty acid ester and / or inulin fatty acid ester.

[0074] In this application, the term "emulsifying thickener" means a substance that has both thickening and emulsifying effects.

[0075] In this application, the term "cosmetics" refers to daily chemical industrial products applied to the surface of the human body, such as skin, hair, nails, and lips, by means of rubbing, spraying, or other similar methods, for the purpose of cleaning, protecting, beautifying, and modifying, including but not limited to sunscreen products, skin care products, and makeup products.

[0076] It will be understood that any numerical range described herein includes all subranges within that range and any combination of the various endpoints of such ranges or subranges.

[0077] Unless otherwise stated, all quantities referred to herein are by weight, and all percentages are based on the total weight percentage of the composition.

[0078] This invention relates to compositions, methods of their preparation, and uses. The invention will be described in detail below.

[0079] Composition In a first aspect, the present invention relates to a composition in the form of an oil-in-water bigel and comprising the following components: (1) (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous thickener; (2) An oil-phase thickener comprising one or more substances selected from the following: cellulose derivatives, such as ethyl cellulose; dextrin / inulin fatty acid esters, such as dextrin palmitate and stearoyl inulin; glutamic acid and its derivatives, such as dibutyllauroyl glutamine and dibutylethylhexanoyl glutamine; eicosanoic acid and its derivatives, such as glyceryl tri(benzyl / isostearate / eicosanoic acid) ester, glyceryl behenate / eicosanoate; polyamides, such as polyamide-8 and polyamide-3; isophorone diisocyanate (IPDI) copolymers. Or sebacic acid copolymers, such as castor oil / IPDI copolymers and hydrogenated castor oil / sebacic acid copolymers; crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionic acid, such as caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), and HDI / trimethylolpropionic acid crosslinked polymers; hydroxystearic acid and its derivatives, such as trihydroxystearin, 9-hydroxystearic acid, 10-hydroxystearic acid, and 12-hydroxystearic acid; polybutene, preferably according to ASTM. D445A is polybutene with a kinematic viscosity of 11-45000 centistokes, preferably 50-3200 centistokes, more preferably 200-3200 centistokes, and even more preferably 200-400 centistokes, as determined at 100°C; waxes, such as paraffin wax, microcrystalline wax, ceresin wax, synthetic wax, polyethylene, trisorbate, glyceryl behenate; sorbitan esters, such as sorbitan olive oil ester, preferably comprising one or more selected from sorbitan olive oil ester, dextrin palmitate, and polybutene, more preferably comprising one or more selected from sorbitan olive oil ester and dextrin palmitate, and even more preferably comprising or being dextrin palmitate; and sucrose fatty acid esters; (3) A polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; and (4) Solvent.

[0080] The dual gel consists of two immiscible phases: an aqueous gel and an oil gel. This unique structure allows the dual gel to possess the properties of both a gel and an emulsion. The inventors have discovered that compositions in the form of an oil-in-water dual gel, having the above-described composition, offer better stability, superior SPF, and improved skin feel compared to other compositions that do not have the described composition and / or are not in the form of an oil-in-water dual gel (e.g., water-in-oil (W / O) dual gels and emulsions). Furthermore, it was surprisingly found that this oil-in-water dual gel system undergoes a phase transition to a water-in-oil form upon application to the skin, forming an oil film on the skin surface, thereby exhibiting strong water resistance.

[0081] In one or more embodiments, in the oil-in-water dual gel, the aqueous phase gel includes component (1), namely (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous phase thickener; and the oil phase gel includes component (2) (i.e., oil phase thickener) and component (3) (i.e., polyglycerol emulsifier).

[0082] In one or more embodiments, the content of (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is 0.05-5.00% by weight, preferably 0.05-2.00% by weight, more preferably 0.05-1.00% by weight, based on the total weight of the composition. For example, the content of (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer may be 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00, 5.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0083] In one or more embodiments, the content of the oil phase thickener is 0.10-15.00% by weight, preferably 0.50-10.00% by weight, more preferably 1.00-5.00% by weight, based on the total weight of the composition. For example, the content of the oil phase thickener may be 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00, 13.00, 14.00, 15.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0084] In one or more embodiments, the oil-phase thickener comprises a selection from sorbitan esters, dextrin / inulin fatty acid esters, and polybutene (preferably polybutene with a kinematic viscosity of 11-45000 cSt, more preferably 50-3200 cSt, more preferably 200-3200 cSt, and even more preferably 200-400 cSt as determined by ASTM D445A at 100°C). For example, the polybutene is selected according to ASTM D445A. The kinematic viscosity of D445A measured at 100°C can be, for example, one or more of the following: 11, 20, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1500, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 15000, 20000, 25000, 30000, 35000, 40000, 45000 centistokes. In one or more preferred embodiments, the oil phase thickener comprises one or more selected from sorbitan olive oil ester, dextrin palmitate, and polybutene (preferably polybutene with a kinematic viscosity of 11-45000 centistokes, more preferably 50-3200 centistokes, more preferably 200-3200 centistokes, and more preferably 200-400 centistokes as determined by ASTM D445A at 100°C).

[0085] In one or more further preferred embodiments, the oil-phase thickener comprises or is a dextrin / inulin fatty acid ester, preferably dextrin palmitate. The inventors have unexpectedly discovered that when the oil-phase thickener comprises or is a dextrin / inulin fatty acid ester, particularly dextrin palmitate, the SPF effect and skin feel of the resulting composition are further improved compared to the case where the oil-phase thickener does not contain dextrin / inulin fatty acid ester. Preferably, the oil-phase thickener comprises or is a dextrin / inulin fatty acid ester, preferably dextrin palmitate, and the content of the dextrin / inulin fatty acid ester is 0.10-15.00% by weight, preferably 0.50-10.00% by weight, more preferably 1.00-5.00% by weight, for example, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0. 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00, 13.00, 14.00, 15.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0086] In one or more embodiments, the oil phase thickener comprises or is a sorbitan ester, preferably sorbitan olive oil ester, and the sorbitan ester content is 0.10-4.00% by weight, preferably 0.50-3.00% by weight, for example, it may be 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0087] In one or more embodiments, the oil-phase thickener comprises or is polybutene and sorbitan olive oil ester, preferably with a polybutene content of 0.10-4.00% by weight, more preferably 0.50-3.00% by weight (e.g., 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00% by weight, or any of the above). The content of sorbitan oleate is 0.10-4.00% by weight, preferably 0.50-3.00% by weight (e.g., 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00% by weight, or the range defined by any two thereof), based on the total weight of the composition.

[0088] In one or more embodiments, the oil-phase thickener comprises or is sorbitan olive oil ester and dextrin palmitate, preferably with an olive oil sorbitan content of 0.10-4.00% by weight, more preferably 0.50-3.00% by weight (e.g., 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00% by weight, or a range defined by any two thereof), and the dextrin palmitate content is... The amount is 0.10-10.00% by weight, preferably 0.20-5.00% by weight, more preferably 0.20-3.00% by weight (e.g., it can be 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00% by weight, or a range defined by any two thereof), based on the total weight of the composition.

[0089] In one or more embodiments, the HLB value of the polyglycerol emulsifier is 0 to 8, preferably 1 to 8, more preferably 3 to 8, for example, it can be 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, or a range defined by any two thereof. Based on conventional emulsification systems, if an emulsifier with an HLB value less than or equal to 8 is selected, it is generally believed that only a water-in-oil emulsion will be obtained. The inventors have unexpectedly discovered that by using a dual-gel form, even if an emulsifier with an HLB value less than 8 is selected, a water-in-oil dual-gel can be obtained, thereby simultaneously achieving improved skin feel and water- and sweat-resistant properties.

[0090] In one or more embodiments, the oil phase thickener comprises a sucrose fatty acid ester obtained by esterification of sucrose with fatty acids, preferably C12–C22, including saturated and mono / polyunsaturated fatty acids.

[0091] HLB is regulated by the degree of fatty acid substitution. In this invention, the preferred HLB value is 1–8, selected from one or more substances in the group consisting of sucrose stearate, sucrose palmitate, sucrose laurate, and sucrose oleate.

[0092] In one or more embodiments, the content of the polyglycerol emulsifier is 0.01-8.00% by weight, preferably 0.50-4.00% by weight, more preferably 0.50-2.00% by weight, based on the total weight of the composition. For example, the content of the polyglycerol emulsifier may be 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0093] In one or more embodiments, the solvent content is 30.0-99.8% by weight, preferably 40.0-80.0% by weight, based on the total weight of the composition. For example, the solvent content may be 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0, 95.0, 99.0, 99.8% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0094] In one or more embodiments, the solvent includes water and a hydrophobic solvent (also referred to as an oleophilic solvent or an oil-soluble solvent) to serve as the medium for forming the aqueous phase and the oil phase in the bigel, respectively.

[0095] The hydrophobic solvent may be selected from one or more of the following: Mineral oils, mineral waxes, triglycerides of polar oils such as capric or octanoic acid, as well as natural oils such as castor oil; fats, waxes and other natural and synthetic esters, preferably fatty acids with low-carbon alcohols, such as esters with isopropanol, propylene glycol or glycerol, or fatty alcohols with low-carbon alkanes or fatty acids; alkyl benzoates; silicone oils such as dimethylpolysiloxanes, diethylpolysiloxanes, diphenylpolysiloxanes, and mixtures thereof.

[0096] Preferably, the polar oil can be selected from the following: a) Esters of saturated and / or unsaturated, branched and / or unbranched alkane carboxylic acids with a chain length of 3-30 carbon atoms, and saturated and / or unsaturated, branched and / or unbranched alcohols with a chain length of 3-30 carbon atoms. b) Esters of aromatic carboxylic acids with saturated and / or unsaturated, branched and / or unbranched alcohols with chain lengths of 3–30 carbon atoms, thus such ester oils may advantageously be selected from the group consisting of: isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate, isononyl stearate, isonononyl isononanoate, isotriadecyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl laurate, 2-ethylhexyl isostearate, 2-hexyldecyl stearate, 2-octyl dodecyl palmitate, 2-ethylhexyl cocoate, oleyl oleate, oleyl erucate, erucic acid oleate, erucic acid erucate, dicaprypypcarbonate (BASF's Cetiol® CC), and dibutyl adipate. (BASF's Cetiol® B), glyceryl cocoate esters (BASF's Myritol® 331), ethylhexyl methoxypropylene (Hallstar's SolaStay® S1), butyl octyl salicylate (e.g., HallBrite® BHB from Hallstar), neopentyl glycol diheptanoate (e.g., LexFeel® 7 from Inolex), and synthetic, semi-synthetic, and natural mixtures of these esters, such as heptaenoate (e.g., LexFeel® Natural from Inolex), jojoba oil, c) Alkyl benzoates, such as C12-15-alkylbenzoates (Finsolv® TN from Innospec Performance Chemicals) or 2-phenylethyl benzoate (X-Tend® 226 from Ashland). d) Lecithin and fatty acid triglycerides, i.e., triglycerides of saturated and / or unsaturated, branched and / or unbranched alkyl carboxylic acids with a chain length of 8-24, particularly 12-18 carbon atoms. For example, these fatty acid triglycerides can be selected from cocoyl glycerol, olive oil, sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palm oil, coconut oil, castor oil, wheat germ oil, grapeseed oil, safflower oil, evening primrose oil, macadamia nut oil, almond oil, avocado oil, etc. e) Dialkyl ethers and dialkyl carbonates, such as dioctyl ether (e.g., Cetiol® OE from BASF) and / or dioctyl carbonate (e.g., Cetiol® CC from BASF), are advantageous.

[0097] f) Saturated or unsaturated, branched or unbranched alcohols, such as octyldodecyl alcohol.

[0098] g) Alkyl esters of amino acids, especially alkyl esters of lauroyl sarcosine, such as isopropyl lauroyl sarcosine (e.g., ELDEW® SL-205 from Ajinomoto OmniChem).

[0099] h) and their mixed forms, such as LexSolv™ A (neopentyl glycol diheptyl ester and propylene glycol dibenzoate) derived from Inolex.

[0100] In a further embodiment, the water content is 20-80% by weight, more preferably 30-70% by weight, based on the total weight of the composition. For example, the water content may be 20, 30, 40, 50, 60, 70, 80% by weight, or a range defined by any two thereof, based on the total weight of the composition. In a further embodiment, the hydrophobic solvent content is 0.5-20% by weight, more preferably 1-10% by weight, based on the total weight of the composition. For example, the content of the hydrophobic solvent may be 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0101] In one or more embodiments, the composition further comprises a UV filter. The UV filter may be selected from one or more of the following: Organic UV filters, such as alkyl alkoxycinnamates like C1-C10 alkyl alkoxycinnamate, C2-C10 alkyl alkoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, 3-benzylene camphor, 4-methylbenzylene camphor, benzophenone-3, butylmethoxydibenzoylmethane, diethylhexylbutamidotriazine ketone, dimethyl PABA ethylhexyl ester, ethylhexyl methoxycinnamate, ethylhexyl salicylate, and ethylhexyl triazine. Ketones, homosalate, isoamyl p-methoxycinnamate, methylenebisbenzotriazolyltetramethylbutylphenol, octocrylene, PEG-25 p-aminobenzoic acid, polyacrylamide methylbenzyl camphor, polysiloxane-15, benzophenone-4, benzophenone-5, benzyl camphor sulfonic acid and its salts, camphor benzalkonium methyl sulfate, disodium phenyl dibenzimidazole tetrasulfonate, phenyl benzimazole sulfonic acid and its potassium, sodium and triethanolamine salts, terephthalic dimethylene camphor sulfonic acid and its salts, and Inorganic UV filters, such as pigments formed from metal oxides (with an average primary particle size of 5-100 nm, preferably 5-50 nm), such as titanium dioxide (amorphous or crystalline in rutile or anatase form), zinc oxide, iron oxide, zirconium oxide, or cerium oxide, which themselves possess known UV photoprotective agents. Titanium dioxide and zinc oxide are preferred, more preferably titanium dioxide (with at least one coating, the coating may contain at least one compound selected from alumina, aluminum hydroxide, silicon dioxide, silicone, silane, fatty acids, fatty alcohols, lecithin, amino acids, polysaccharides, proteins, alkanolamines, waxes such as beeswax, (meth)acrylic polymers, and organic UV filters).

[0102] In a preferred embodiment, the UV filter includes organic UV filters and inorganic UV filters.

[0103] In a further embodiment, the UV filter content is 0.1-30.0% by weight, preferably 15.0-25.0% by weight, based on the total weight of the composition. For example, the UV filter content can be 0.1, 0.5, 1.0, 5.0, 10.0, 20.0, 30.0% by weight, or a range defined by any two thereof, based on the total weight of the composition. The inventors have discovered that the water-in-oil dual-gel composition according to the present invention is compatible with both organic and inorganic UV filters, achieving excellent SPF performance.

[0104] In one or more embodiments, the composition further comprises a neutralizing agent containing a basic group. This neutralizing agent can be used to neutralize the carboxylic acid groups of the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, thereby further improving thickening and emulsifying effects. The neutralizing agent may be selected from one or more of arginine, sodium hydroxide, potassium hydroxide, sodium citrate, triethanolamine, tromethamine, and aminomethylpropanol, preferably arginine, and more preferably arginine. In a further embodiment, the neutralizing agent is present in an amount of 0.01-5.00% by weight, preferably 0.05-1.00% by weight, based on the total weight of the composition. For example, the content of the neutralizing agent may be 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 2.00, 2.25, 3.00, 3.25, 4.00, 4.25, 5.00% by weight, or a range defined by any two thereof, based on the total weight of the composition.

[0105] In one or more embodiments, the composition further comprises other ingredients (e.g., active ingredients), including ascorbic acid and its derivatives such as ascorbate tetraisopalmitate (sold by Nikko Chemicals under the trade name NIKKOL VC-IP), L-ascorbic acid 2-glucoside vitamin C (sold by NAGASE & CO., LTD under the trade name AA2G™); resorcinol and its derivatives; enzymes; and mixtures thereof. Ascorbic acid can have any properties. Therefore, it can be of natural origin, in powder form or in the form of orange juice, preferably orange juice concentrate. It can also be of synthetic origin, preferably in powder form.

[0106] Examples of ingredients that can be mentioned include moisturizers such as hyaluronic acid and its salts, protein hydrolysates and polyols such as butylene glycol, propylene glycol, glycerol, dipropylene glycol, diglycerides, etc.; polyethylene glycol; recombinant collagen; natural extracts; anti-inflammatory agents; oligomeric proanthocyanidins; vitamins such as vitamin A (retinol), vitamin E (tocopherol), vitamin B5 (panthenol), vitamin B3 (niacinamide), derivatives of these vitamins (especially esters) and mixtures thereof; resveratrol; BHT; ceramides; and ceramide-like substances; amino acid esters such as myristoyl methyl β-alanine (phytosterol / decyl tetradecyl) ester (sold by Ajinomoto Co., Inc. under the trade name ELDEW® PS-203, PS-304, PS-306); cholesterol and its derivatives such as 7-dehydrocholesterol (sold by MMP International under the trade name SKIN'ENTIAL DC). 96P for sale); steroids; urea; caffeine; depigmenting agents such as kojic acid, hydroquinone and caffeic acid; salicylic acid and its derivatives; α-hydroxy acids such as lactic acid and glycolic acid and their derivatives; retinoids such as carotenoids and vitamin A derivatives; hydrocortisone; melatonin; extracts of algae, fungi, plants, yeasts, and bacteria, such as licorice extract, including potassium glycyrrhizate, glycyrrhizin, glycyrrhetinic acid, glycyrrhizin chalcone, etc.; antibacterial agents such as 2,4,4'-trichloro-2'-hydroxydiphenyl ether (or triclosan), 3,4,4'-trichlorocarbazide (or triclocarban) and the acids mentioned above, and especially salicylic acid and its derivatives; matting agents, such as fibers; tensioning agents; and mixtures thereof.

[0107] There are no particular restrictions on the content of other possible components, and those skilled in the art can select appropriate content as needed.

[0108] In one or more embodiments, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer comprises structural units derived from monomers such as: 95.9 to 98.8% by weight of an olefinic unsaturated carboxylic acid monomer selected from acrylic acid, methacrylic acid and ethylacrylic acid; 1 to 3.5% by weight of acrylate compounds having the following structural formula

[0109] Where R is an alkyl group containing 10 to 30 carbon atoms, and R1 is hydrogen, methyl, or ethyl; and Optionally, 0.1 to 0.6% by weight of a crosslinking agent, such as an alkenyl ether of a polyol and / or a (C1-C2 alkyl) acrylate, each molecule of which contains two or more polymerizable alkenyl groups and / or (C1-C2 alkyl) acrylate groups, wherein the polyol contains at least 3 carbon atoms and at least 2 hydroxyl groups, for example, at least 3 hydroxyl groups. The polyol may be, for example, an alkylene (e.g., C3-C20, e.g., C3-C10) polyol or an alkylene (e.g., C2-C4, e.g., C2-C3) adduct of an alkylene (e.g., C3-C20, e.g., C3-C10) polyol (e.g., the number of alkylene oxide molecules added to each hydroxyl group of each polyol molecule is 1-40, for example 2-30, for example 3-20, for example 5-10).

[0110] In one or more further embodiments, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer comprises structural units derived from monomers including: 96 to 97.9% by weight of acrylic acid, 2.5 to 3.5% by weight of alkyl methacrylate wherein the alkyl group contains 12 to 22 carbon atoms, and 0.2 to 0.4% by weight of a crosslinking agent. The crosslinking agent may be, for example, as defined above. Non-limiting examples of crosslinking agents include, for example, ethylene glycol, (poly)polyethylene glycol (e.g., diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol), propylene glycol, (poly)polypropylene glycol (e.g., dipropylene glycol, tripropylene glycol, tetrapropylene glycol, polypropylene glycol), polyethylene glycol-propylene glycol, glycerol, polyglycerol, pentaerythritol, dipentaerythritol, trimethylolpropane, sugars (e.g., sucrose), or any one or more polyallyl ethers (e.g., di-, tri-, or more tetravalent allyl ethers depending on the number of hydroxyl groups in the molecule), polyvinyl ethers (e.g., di-, tri-, or more tetravalent vinyl ethers depending on the number of hydroxyl groups in the molecule), and poly(C1-C2) acrylates (e.g., di-, tri-, or more tetravalent (C1-C2) acrylates depending on the number of hydroxyl groups in the molecule).

[0111] In one or more embodiments, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is an acrylic acid / acrylic acid C10-C30 alkyl ester copolymer.

[0112] In one or more embodiments, the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is a crosslinked copolymer.

[0113] In one or more embodiments, the aqueous thickener is an aqueous emulsifying thickener, and / or the oil-phase thickener is an oil-phase emulsifying thickener.

[0114] In one or more preferred embodiments, the composition comprises the following components: (1) 0.05-5.00% by weight, preferably 0.05-2.00% by weight, more preferably 0.05-1.00% by weight of (C1-C2 alkyl) acrylic acid / (C1-C2 alkyl) acrylic acid C10-C30 alkyl ester copolymer, preferably acrylic acid / acrylic acid C10-C30 alkyl ester crosslinked copolymer; (2) 0.10-10.00% by weight, preferably 0.20-5.00% by weight of dextrin palmitate; (3) Optional 0.10-4.00% by weight, preferably 0.50-3.00% by weight of sorbitan oleate; (4) Optional 0.10-4.00% by weight, preferably 0.50-3.00% by weight of polybutene; (5) 0.01-8.00% by weight, preferably 0.50-4.00% by weight, more preferably 0.50-2.00% by weight, of a polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; (6) Optional 0.1-30.0% by weight, more preferably 15.0-25.0% by weight of UV filter; (7) Arginine, optionally 0.01-5.00% by weight, preferably 0.05-1.00% by weight; (8) Optional 0.5-20% by weight, preferably 1-10% by weight, of a hydrophobic solvent; and (9) 20-80% by weight, preferably 30-70% by weight of water.

[0115] In one or more embodiments, the composition may further include other ingredients depending on its intended use.

[0116] In one or more embodiments, the composition may be a cosmetic composition, particularly a sunscreen composition. Especially when used as a sunscreen composition, the composition can simultaneously provide good stability, good water and sweat resistance, excellent SPF effect, and improved lightweight, water-repellent feel, thereby obtaining a sunscreen cosmetic product that meets multiple performance requirements.

[0117] The compositions according to the invention may be, for example, in the form of a cream or emulsion.

[0118] The compositions according to the invention can be applied to the skin, particularly in the form of fine particles, by means of a pressure device.

[0119] The compositions according to the invention, packaged in aerosol form, typically contain conventional propellants such as hydrofluoric compounds, dichlorodifluoromethane, difluoroethane, dimethyl ether, isobutane, n-butane, propane, or trichlorofluoromethane. These are preferably present in an amount ranging from 15% to 50% by weight relative to the total weight of the composition.

[0120] Preparation method In a second aspect, the present invention relates to a method for preparing a composition according to the first aspect, comprising the following steps: i) Mix water, (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, and optionally a neutralizing agent to obtain the aqueous phase composition; ii) Mixing the oil-phase thickener, polyglycerol emulsifier, and optionally a hydrophobic solvent, optionally an oil-soluble active ingredient, and / or optionally a UV filter, yields the oil-phase composition; and iii) Add the oil phase component to the aqueous phase component and mix to obtain the composition.

[0121] The inventors discovered that the above method can prepare a water-in-oil dual-gel composition that simultaneously provides good stability, good compatibility with both organic and inorganic UV filters, a high SPF effect, and a refreshing, water-repellent feel. In contrast, if other methods are used (e.g., adding the aqueous phase to the oil phase in step iii), a water-in-oil dual-gel composition cannot be obtained, thus failing to simultaneously achieve good stability, a high SPF effect, and a refreshing, water-repellent feel.

[0122] The components contained in the composition are as described above in the section concerning the composition of the first aspect of the invention, and will not be repeated here.

[0123] For the mixed conditions in steps i)-iii), those skilled in the art can make appropriate selections according to actual needs.

[0124] In one or more embodiments, in step i), water, (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, and optional neutralizing agent are mixed uniformly and heated to 40-90°C, for example, 40, 50, 60, 70, 80, 90°C or a range defined by any two thereof, to obtain an aqueous phase component.

[0125] In one or more embodiments, in step ii), the oil phase thickener, polyglycerol emulsifier, and optionally a hydrophobic solvent, optionally an oil-soluble active ingredient, and / or optionally a UV filter are homogenized at a temperature of 40-99°C, preferably 70-99°C (e.g., 40, 50, 60, 70, 80, 90, 95, 99°C or any two thereof) for 5 minutes to 1 hour, for example 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 minutes or any two thereof, to obtain the oil phase component.

[0126] In one or more embodiments, in step iii), the oil phase component is added to the aqueous phase component and homogenized for 5 minutes to 1 hour, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 minutes or a range defined by any two thereof. The homogenization rate may be 4000-9000 rpm, preferably 5000-8000 rpm, for example, 4000, 5000, 6000, 7000, 8000, 9000 rpm or a range defined by any two thereof. In one or more embodiments, the method further includes cooling to a temperature of 20-60°C, particularly 30-40°C, after homogenization to obtain the composition.

[0127] The present invention also relates to compositions obtained by the method of the second aspect of the invention. All descriptions of the components of the compositions of the first aspect of the invention above are applicable here and will not be repeated.

[0128] use In a third aspect, the present invention relates to the use of compositions according to the first aspect or compositions prepared by the method according to the second aspect for the preparation of cosmetics, particularly sunscreen cosmetics.

[0129] The compositions according to the invention are particularly suitable for use in cosmetics, especially sunscreen cosmetics. When the compositions according to the invention are used to prepare sunscreen cosmetics, sunscreen cosmetics that simultaneously possess good stability, good water and sweat resistance, excellent SPF effect, and improved refreshing and water-repellent skin feel can be obtained.

[0130] However, there are no particular limitations on the use of the compositions according to the invention; for example, the compositions can be used for other applications requiring improved stability, water and sweat resistance, skin feel, or SPF value.

[0131] Example To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. In the following text, unless otherwise stated, all contents or concentrations mentioned are by weight.

[0132] I. Source of Raw Materials The sources of the raw materials involved in the examples are shown in Table 1 below.

[0133] Table 1: Sources of each raw material

[0134] II. Testing Methods Characterization of dosage forms The dosage form of the test composition is determined by microscopy and dye mixing experiments, specifically whether it is an oil-in-water (O / W) or water-in-oil (W / O) composition. In this invention, the composition is determined to be an O / W or W / O dosage form based on the composition of the dispersed phase (particles) or the continuous phase (matrix). That is, if the oil phase acts as the dispersed phase (particles), it is an O / W dosage form; conversely, if the oil phase acts as the continuous phase (matrix), it is a W / O dosage form.

[0135] (1) Microscopic testing: The sample of the composition to be tested was observed under a microscope (LEICA DM2500 LEDOptical microscope, purchased from Leica Microsystems Inc.) under both normal and polarized light fields to determine the dosage form. Specifically, since the oil phase will produce a shiny phenomenon in a polarized light field, if the particles are shiny in the microscope image under a polarized light field, the oil phase is the dispersed phase, and the composition is determined to be an O / W dosage form; if the particles are black in the microscope image under a polarized light field (no polarized light phenomenon), the oil phase is the continuous phase, and the composition is determined to be a W / O dosage form.

[0136] (2) Dye mixing experiment: Place 2g of the sample of the test composition into a weighing pan, add 0.2g of 0.1% by weight water-soluble blue 1 (BLUE 1 (CI 42090), trade name UNICERT BLUE 05601-J, purchased from Sensient) aqueous solution, shake thoroughly and observe whether the water-soluble blue 1 can be fully and uniformly mixed into the sample. Based on the principle of "like dissolves like", if the water-soluble blue 1 can be fully and uniformly mixed into the sample, it indicates that the external phase is the aqueous phase, that is, the composition is determined to be an O / W formulation; if the water-soluble blue 1 is difficult to mix into the sample, the composition is determined to be a W / O formulation.

[0137] Characterization of stability 1 After storing the sample of the test composition at 50°C for 4 weeks, observe the layering and oil exudation of the sample. If no layering or oil exudation is observed, the system is considered stable.

[0138] Characterization of stability 2 After the formulations obtained from comparative examples A and B were left to stand for one week, the sample material was visually observed: if it was uniform, without oil-water separation, and without obvious coarse particle agglomeration, it was considered stable; if it was uneven, with oil-water separation or obvious coarse particle agglomeration, it was considered unstable.

[0139] Characterization of In-vitro SPF The in-vitro sun protection factor (SPF) of the samples was measured using an SPF290AS analyzer from Solar Light Company, LLC, via WinSPF software. Samples were uniformly coated at a concentration of 1.3 mg / cm² onto PMMA plates. 2 After the sample was dried, measurements were performed at four specified locations on the PMMA plate using an SPF290AS analyzer. Each measurement was performed in 5nm wavelength increments, scanning from 290nm to 400nm. The in-vitro SPF value was read from the WinSPF software. Under the same conditions, the reference standard P8 (in-vitro SPF 63) was measured, and its in-vitro SPF value in the WinSPF software formula was read. Based on the ratio of this result to 63, the in-vitro SPF value of the sample was calculated using the WinSPF software formula, and the final in-vitro SPF report value of the sample was obtained.

[0140] Characterization of water resistance Take 0.5g of each test composition and apply it to an equal area of ​​artificial skin (model: BIODY Plates20#, purchased from Beaulax, Co. LTD). Rinse with water for 2 minutes. Then, observe whether there is any oil film residue. If an oil film remains on the surface of the artificial skin, the sample is considered to be water-resistant; otherwise, if no oil film remains on the surface of the artificial skin, the sample is considered not to be water-resistant.

[0141] Evaluation of skin feel The skin feel of each test composition was scored by an evaluator group using a Tier-based method. The scoring method is as follows:

[0142] Skin feel rating criteria (Tier 1-10, rounded to the nearest integer): 10 points is the skin feel of the above water phase formula (very light, water-breaking), and 0 points is the skin feel of the above oil phase formula (very thick and oily). 6 points and above indicate water-breaking or relatively light texture, while 5 points and below indicate heavy and oily texture.

[0143] Appearance of the material after application Samples of each composition to be tested were applied to BYK 3B black and white cardstock (referred to as black and white cardstock) and their appearance was observed, such as the degree of water breakage.

[0144] Characterization of in-vitro SPF loss ratio The tests were conducted using an SPF290AS analyzer and its WinSPF software from Solar Light Company, LLC. The in-vitro SPF of the samples was measured before and after irradiation to evaluate the UV stability of the formulation.

[0145] (1) Determination of initial in-vitro SPF The sample was evenly coated onto the surface of the PMMA plate at a dosage of 1.3 mg / cm². After the sample is dried, place the PMMA plate on the SPF290AS analyzer and scan the four selected measurement points on the plate according to the equipment operation requirements (scanning wavelength range of 290-400 nm, step of 5 nm).

[0146] The in-vitro SPF was directly read by WinSPF software and used as the initial SPF value for the sample. in vitro SPF_initial).

[0147] (2) Illumination conditions and determination of in-vitro SPF after irradiation The same PMMA board was placed under Solar Light's Solar Simulator and subjected to 12 MED lighting treatment.

[0148] After 12MED irradiation, the same plate was placed back on the SPF290AS analyzer and scanned at the same four measurement points in the same manner as the initial test (wavelengths of 290-400nm, in 5nm increments).

[0149] The SPF value output by WinSPF software is recorded as the SPF value of the sample after 12MED irradiation (in-vitro SPF_12MED).

[0150] (3) Calculation of photodegradation rate The SPF loss rate of the sample after 12MED illumination was calculated using the following formula:

[0151] In the formula: in-vitro SPF initial The SPF value of the sample before irradiation; in-vitro SPF 12MED The SPF value of the sample after being exposed to 12MED light.

[0152] Remark: 1: MED: Minimum erythema dose. In this in vitro study, 1 MED is defined as 21 mJ / cm². 2 Defined by instrument supplier SolarLight.

[0153] 2:12MED complies with the general range of radiation doses used to characterize the photostability of sunscreens in industry regulations and research literature. III. Preparation Experiment of the Composition The composition (formulation WSP-1) of Example 1 according to the present invention was prepared by the following method according to the composition formulation shown in Table 2 below: Water, PEMULEN™ TR-1 polymer, PEMULEN™ TR-2 polymer, L-ARGININE C-GRADE, and 1,3 BUTYLENE GLYCOL from the aqueous phase were added sequentially to the main pot, mixed evenly, and heated to 80-85°C to obtain the aqueous phase component; the components from the oil phase were added to the auxiliary pot, heated to 80-85°C, and mixed evenly for at least 15 minutes to obtain the oil phase component; then, the oil phase component was slowly added to the aqueous phase component in the main pot under stirring, the homogenizer was turned on, and homogenized at 6000-7000 rpm for 15 minutes, and then cooled to 30-40°C to obtain the composition.

[0154] The compositions of Examples 2-4 (formulations OT-5, OT-2, and OT-3, respectively) were prepared in the same manner as in Example 1, except that the oil phase thickeners shown in Table 2 were replaced with the components of OLIVEM® 900 and RHEOPEARL® KL2, respectively.

[0155] The compositions of Comparative Examples 1-3 (formulations WSP-2, WSP-3, and WSP-4, respectively) were prepared in the same manner as in Example 1, except that CARBOPOL® 981 polymer, SEPIMAX™ ZEN, and VANZAN® NF-F were used instead of PEMULEN™ TR-1 polymer and PEMULEN™ TR-2 polymer, respectively.

[0156] The composition of Comparative Example 4 (Formulation EM-2) was prepared in the same manner as in Example 1, except that the polyglycerol emulsifier BARSOLVE NS-100 with an HLB value greater than 8 was used instead of the polyglycerol emulsifier BARSPERSE-15 with an HLB value less than 8.

[0157] According to the composition shown in Table 2 below, the composition of Comparative Example 5 (formulation WSP-1 / P5) was prepared by the following method: Each component of the oil phase was added to the main pot, heated to 80-85°C and mixed evenly for at least 15 minutes to obtain the oil phase components; water was added to the auxiliary pot and heated to 80-85°C; then the homogenizer was turned on, the water in the auxiliary pot was added to the main pot, and homogenized at 6000-7000 rpm for 15 minutes, then cooled to 30-40°C, and then PEMULEN™ TR-1 polymer, PEMULEN™ TR-2 polymer, L-ARGININE C-GRADE, and 1,3 BUTYLENE GLYCOL were added to the main pot in sequence, mixed evenly, and finally the composition was obtained.

[0158] The compositions obtained above were characterized by dosage form, stability, in vitro SPF value, water resistance, and skin feel according to the test methods in Part II.

[0159] exist Figures 1A to 1IThe image shows microscopic images (left image: normal light; middle image: polarized light) of the compositions of Examples 1-4 and Comparative Examples 1-5, and the visual appearance of the mixtures obtained by mixing with the dye (right image). It can be seen that the compositions of Examples 1-4 and Comparative Examples 3 and 4 exhibit a shiny particle phenomenon in the microscopic images, and the water-soluble blue 5 is well mixed into the sample in the mixing experiment, indicating that they are O / W formulations. The compositions of Examples 1-4 and Comparative Example 3 are in bigel form, while the composition of Comparative Example 4 is in emulsion form. However, the compositions of Comparative Examples 1-2 and 5 do not exhibit a shiny particle phenomenon in the microscopic images under polarized light, and the water-soluble blue 5 cannot be well mixed into the sample in the dye mixing experiment, indicating that they are in W / O emulsion form. Figures 1A to 1I The results for the dosage forms shown are summarized in Table 2.

[0160] exist Figure 2A The images shown from left to right depict the visual appearance of the compositions of Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, Example 2, Example 3, Example 4, Comparative Example 4, and Comparative Example 5 after storage at 50°C for 4 weeks. Figure 2B Enlarged images of the visual appearance of the compositions of Comparative Examples 2, 3, and 5 after storage at 50°C for 4 weeks, shown from left to right. It can be seen that the composition of Comparative Example 3 (formulation WSP-4) exhibits obvious stratification after storage at 50°C for 4 weeks. The compositions of Comparative Examples 2 (formulation WSP-3) and 5 (formulation WSP-1 / P5) show oil exudation at the top after storage at 50°C for 4 weeks. The other compositions show no stratification or oil exudation even after storage at 50°C for 4 weeks, indicating that the compositions of Comparative Examples 2, 3, and 5 are unstable after storage at 50°C for 4 weeks, while the other compositions exhibit stable systems. Figure 2A and 2B The stability results are summarized in Table 2.

[0161] exist Figure 3 The results of water resistance tests for each composition are shown below. The first row of three images, from left to right, corresponds to the compositions of Example 1, Comparative Example 4, and Comparative Example 5, respectively. The second row of three images, from left to right, corresponds to the compositions of Comparative Examples 1-3, respectively. The third row of three images, from left to right, corresponds to the compositions of Examples 2-4, respectively. It can be seen that Comparative Example 4 (formulation EM-2), similar to a conventional O / W emulsion, leaves no oil film on the artificial skin surface after rinsing with water, indicating that it does not have water resistance. However, all the other compositions leave an oil film residue. In particular, although the compositions of Examples 1-4 according to the present invention are O / W formulations, a white oil film remains on the artificial skin surface after rinsing with water, indicating that they possess water resistance. Figure 3 The results of the water resistance are summarized in Table 2.

[0162] The skin feel evaluation results of each composition are summarized in Table 2.

[0163] exist Figure 4 The images show the observation results of the appearance of each composition after application. The five images in the first row, from left to right, correspond to the compositions of Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 5, respectively. The four images in the second row, from left to right, correspond to the compositions of Example 2, Example 3, Example 4, and Comparative Example 4, respectively. It can be seen that the compositions of Examples 1 and 4 (formulations WSP-1 and OT-3, respectively) have a distinctly light and water-breaking appearance; the compositions of Examples 2 and 3 (formulations OT-5 and OT-2, respectively) also have a certain water-breaking feel; the compositions of Comparative Examples 1 and 2 (formulations WSP-2 and WSP-3, respectively) have a distinctly viscous and heavy appearance; the composition of Comparative Example 3 (formulation WSP-4) has a relatively rough appearance after application, while the composition of Comparative Example 4 (formulation EM-2) has a relatively uniform appearance, both with a very weak water-breaking feel; the composition of Comparative Example 5 (formulation WSP-1 / P5) has a very distinct milky and thick appearance. As can be seen from the above, the evaluation results of the material appearance are completely consistent with the skin feel evaluation results listed in Table 2.

[0164]

[0165] As can be seen from Table 2 above, the water-in-oil dual-gel compositions of Examples 1-4 of the present invention have good stability, excellent SPF effect (compatible with organic and inorganic UV filters), good water resistance, and a lighter, more water-repellent feel compared to the compositions of Comparative Examples 1-5. The compositions of Comparative Examples 1-5, which do not conform to the composition and form of the present invention, cannot simultaneously meet the above performance requirements.

[0166] Specifically, Example 1 is a composition in the form of an oil-in-water dual gel according to the composition of the present invention; the difference between Comparative Examples 1-3 and Example 1 is only that Example 1 used an acrylate / C10-30 alkanol acrylate crosspolymer as an aqueous phase thickener, while Comparative Examples 1-3 used other types of aqueous phase thickeners; the difference between Comparative Example 4 and Example 1 is only that Example 1 used a polyglycerol emulsifier with an HLB value less than 8, while Comparative Example 4 used a polyglycerol emulsifier with an HLB value greater than 8; the difference between Comparative Example 5 and Example 1 is that in the preparation of the composition of Comparative Example 5, the aqueous phase was added to the oil phase, while in the preparation of the composition of Example 1, the oil phase was added to the aqueous phase. As a result, the composition obtained in Comparative Example 5 is an oil-in-water emulsion, while the composition obtained in Example 1 is an oil-in-water dual gel. As can be seen from the results in Table 2 above, compared with the compositions of Comparative Examples 1-5, the composition of Example 1 simultaneously possesses good stability, excellent SPF effect (compatible with organic and inorganic UV filters), good water resistance, and improved skin feel.

[0167] Furthermore, a comparison of Examples 1-4 shows that the only difference in composition between the compositions of Examples 1-4 is the use of different oil-phase thickener systems. Unexpectedly, the composition of Example 4, using dextrin palmitate as the oil-phase thickener, achieved further improved SPF effect and skin feel compared to the compositions of Examples 1-3, which used other oil-phase thickener systems.

[0168] According to the composition shown in Table 3 below, the composition of Example A of the present invention (formulation UL-24) was prepared by the following method: (1) Water, PEMULEN™ TR-1 polymer, PEMULEN™ TR-2 polymer, L-ARGININE C-GRADE, 1,3 BUTYLENE GLYCOL and LIPOXOL 400 MED in the aqueous phase were added to the main pot in sequence, mixed evenly and heated to 45-85°C to obtain the aqueous phase component; (2) Each component in the oil phase was added to the auxiliary pot, heated to 60-90°C and mixed evenly for at least 15 minutes to obtain the oil phase component; (3) At 45-85°C, the oil phase component was added to the aqueous phase component in the main pot, the homogenizer was turned on and homogenized at 3000-8000 rpm for 15-30 minutes; (4) The mixture was cooled to below 25-35°C, and a chelating agent such as DISODIUM EDTA RONACARE and a water-soluble preservative SODIUM were added. After BENZOATE, polyacrylate crosslinking polymer-6 is added and homogenized; (5) the mixture is cooled to room temperature to obtain the composition.

[0169] The compositions of Examples B, C, D, E, F, G, H, and I (formulations UL-25, UL-2, UL-3, UL-4, UL-5, UL-28, UL-29, and UL-30, respectively) were prepared in the same manner as Example A (formulation UL-24), except that the amount of polyacrylate crosslinker-6 added was as shown in Table 3.

[0170] Comparative Examples J, Examples K, L, M, and N (formulations UL-6, UL-7, UL-12, UL-16, and UL-17, respectively) were prepared in the same manner as Example E (UL-4), except that the oil phases shown in Table 3 were added respectively.

[0171] The compositions of Comparative Examples A, B, and C (formulations UL-1, UL-9, and UL-11, respectively) were prepared in the same manner as in Example A (formulation UL-24), except that the amounts of PEMULEN™ TR-1 polymer, PEMULEN™ TR-2 polymer, and polyacrylate crosslinking polymer-6 shown in Table 3 were added.

[0172] The above-obtained compositions were characterized for dosage form and UV protection loss according to the test methods in Part II. Table 3

[0173] As shown in Comparative Example A (Formulation UL-1), the oil-in-water bigel containing 0.3% PEMULEN™ TR-1 polymer / PEMULEN™ TR-2 polymer (total addition) was visually observed as follows. Figure 7 As shown: the material is smooth and uniform, with no oil-water separation, no large particle agglomeration, and appears stable; microscopic testing shows... Figure 5 As shown: its particles are distinct, although there are occasional large particles, most of them are relatively uniform, which can be preliminarily confirmed as a stable state of oil-free water separation; in addition, from the normal light and polarized light fields of view, the continuous phase is water, which is an o / w bigel; the characterization of the in-vitro SPF loss ratio shows that after 12MED ultraviolet irradiation, the ultraviolet protection loss rate is 33.32%.

[0174] In contrast, as shown in Comparative Example B (Formulation UL-9), the bicontinuous phase bigel containing 0.3% polyacrylate crosslinker-6, visually observed as... Figure 7 As shown: the material is uneven; although there is no oil-water separation, there is large particle agglomeration, and the appearance is not very stable; microscopic testing shows... Figure 6As shown: UL-9 particles are basically non-formed, and the oil phase and water phase are in a near-separated state. This structure is very unstable; the UV protection loss rate is 15.89%, and the protection performance is better than the PEMULEN™ TR-1 polymer / PEMULEN™ TR-2 polymer system.

[0175] As shown in Comparative Example C (Formulation UL-11), the UV protection loss rate of the system further decreased with the increase of the amount of polyacrylate crosspolymer-6 added. When the amount of polyacrylate crosspolymer-6 added increased to 0.8%, the loss rate dropped to 0.62%.

[0176] As shown in the compositions of Examples A, B, C, D, E, F, G, H, and I (formulations UL-24, UL-25, UL-2, UL-3, UL-4, UL-5, UL-28, UL-29, and UL-30, respectively), when PEMULEN™ TR-1 polymer / PEMULEN™ TR-2 polymer is used in combination with polyacrylate crosslinker-6, the system not only forms a stable oil-in-water bigel, but also continuously reduces the UV protection loss rate. With increasing amounts of polyacrylate crosslinker-6, the UV protection loss rate eventually becomes negative, indicating an unexpected improvement in the system's UV protection performance (i.e., a "net gain rather than a loss"), meaning the system exhibits good UV stability.

[0177] As shown in the compositions of Comparative Example J, Examples K, L, M, and N (formulations UL-6, UL-7, UL-12, UL-16, and UL-17, respectively), when PEMULEN™ TR-1 polymer / PEMULEN™ TR-2 polymer is compounded with polyacrylate crosslinker-6 in a specific ratio, different types of oil phase components are used, and structural stability and UV stability are achieved.

[0178] The above description is merely an exemplary embodiment of the present invention. It should be noted that those skilled in the art can make improvements to the present invention without departing from the inventive concept, and all such improvements fall within the scope of protection of the present invention.

Claims

1. A bigel composition having a bigel structure comprising an aqueous phase gel and an oil phase gel, wherein the composition comprises the following components: (1) (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous thickener; (2) An oil-phase thickener comprising one or more substances selected from the group consisting of: (i) cellulose; (ii) dextrin / inulin fatty acid esters; (iii) glutamic acid and its derivatives; (iv) eicosanoic acid and its derivatives; (v) polyamides; (vi) isophorone diisocyanate (IPDI) copolymers or sebacic acid copolymers; (vii) crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionic acid; (viii) hydroxystearic acid and its derivatives; (ix) polybutene; (x) waxes; (xi) sorbitan esters; and (xii) sucrose fatty acid esters; (3) Polyglycerol emulsifiers with an HLB value of 0 to 8; and (4) Solvent.

2. The bigel composition of claim 1, wherein the composition is a bigel structure comprising a continuous aqueous phase gel and a dispersed oil phase gel.

3. The dual-gel composition of claim 1, wherein the continuous aqueous phase gel comprises an aqueous phase thickener and the dispersed oil phase gel comprises an oil phase thickener.

4. The bigel composition of claim 1, wherein the average particle size of the dispersed oil phase gel is 0.1-50 μm.

5. The bigel composition of claim 1, wherein, when observed under a polarized light microscope, the composition exhibits a bigel structure with a continuous aqueous phase and a gel-dispersed oil phase.

6. The bigel composition of claim 1, wherein the bigel structure is an oil-in-water bigel structure.

7. The bigel composition of claim 1, wherein the composition exhibits improved UV stability under UV irradiation.

8. The dual-gel composition of claim 1, wherein the continuous aqueous phase gel and the dispersed oil phase gel are physically combined to form a dual-gel structure.

9. The dual-gel composition of claim 1, wherein the SPF loss rate of the composition is not higher than 5% under UV irradiation conditions.

10. The bigel composition of claim 1, wherein: The cellulose class includes ethyl cellulose; The dextrin / inulin fatty acid ester is selected from one or more substances from the group consisting of dextrin palmitate and stearoyl inulin. The glutamic acid and its derivatives are selected from one or more substances from the group consisting of: dibutyllauroyl glutamine and dibutylethylhexanoyl glutamine; The eicosanoic acid and its derivatives are selected from one or more substances in the group consisting of: glycerol tris(behenic acid / isostearate / eicosanoic acid) ester, glycerol behenic acid ester / eicosanoic acid ester; The polyamide is selected from one or more substances from the group consisting of polyamide-8 and polyamide-3; The isophorone diisocyanate (IPDI) copolymer or sebacic acid copolymer is selected from one or more of the group consisting of castor oil / IPDI copolymer and hydrogenated castor oil / sebacic acid copolymer; The crosslinked polymer containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionate is selected from one or more of the group consisting of: caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), and HDI / trimethylolpropionate crosslinked polymer. The hydroxystearic acid and its derivatives are selected from one or more substances from the group consisting of: trihydroxystearin, 9-hydroxystearic acid, 10-hydroxystearic acid and 12-hydroxystearic acid; The polybutene is selected from one or more polybutenes with a kinematic viscosity of 11-45000 centistokes as determined by ASTM D445A at 100°C. The wax is selected from one or more substances from the group consisting of: paraffin wax, microcrystalline wax, ceresin wax, synthetic wax, polyethylene, triglyceride, and glyceryl behenate. The sucrose fatty acid ester is obtained by esterification of sucrose with fatty acids, the fatty acids being selected from one or more of C12–C22, including saturated and mono / polyunsaturated fatty acids. The HLB value of the sucrose fatty acid ester is selected from 1–8, and it is selected from one or more of the group consisting of: sucrose stearate, sucrose palmitate, sucrose laurate, and sucrose oleate; and The sorbitol esters include sorbitan olive oil esters, preferably including one or more selected from sorbitan olive oil esters and dextrin palmitate esters.

11. The bigel composition according to any one of claims 1-10, wherein the content of (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is 0.05-5.00% by weight, based on the total weight of the composition.

12. The dual-gel composition according to any one of claims 1-10, wherein the content of the oil phase thickener is 0.10-15.00% by weight, based on the total weight of the composition.

13. The bigel composition according to any one of claims 1-10, wherein the oil phase thickener comprises or is a dextrin / inulin fatty acid ester, said dextrin / inulin fatty acid ester being present in an amount of 0.10-15.00% by weight, based on the total weight of the composition.

14. The bigel composition according to any one of claims 1-10, wherein the oil phase thickener comprises or is sorbitol ester, and the content of sorbitol ester is 0.10-4.00% by weight, based on the total weight of the composition.

15. The bigel composition according to any one of claims 1-10, wherein the oil phase thickener comprises or is polybutene and sorbitan olive oil ester, said polybutene being present in an amount of 0.10-4.00% by weight, based on the total weight of the composition.

16. The bigel composition according to any one of claims 1-10, wherein the oil phase thickener comprises or is sorbitan olive oil ester and dextrin palmitate, wherein the content of sorbitan olive oil ester is 0.10-4.00% by weight and the content of dextrin palmitate is 0.10-10.00% by weight, based on the total weight of the composition.

17. The bigel composition according to any one of claims 1-10, wherein the content of the polyglycerol emulsifier is 0.01-8.00% by weight, based on the total weight of the composition.

18. The bigel composition according to any one of claims 1-10, wherein the solvent content is 30.0-99.8% by weight, based on the total weight of the composition.

19. The bigel composition according to any one of claims 1-18, wherein the solvent comprises water and a hydrophobic solvent, wherein the water content is 20-80% by weight and the hydrophobic solvent content is preferably 0.5-20% by weight, based on the total weight of the composition.

20. The bigel composition of claim 19, wherein the hydrophobic solvent is one or more selected from the group consisting of: a) Esters of saturated and / or unsaturated, branched and / or unbranched alkane carboxylic acids with a chain length of 3-30 carbon atoms, and saturated and / or unsaturated, branched and / or unbranched alcohols with a chain length of 3-30 carbon atoms. b) Esters of aromatic carboxylic acids with saturated and / or unsaturated, branched and / or unbranched alcohols with chain lengths of 3–30 carbon atoms. c) Alkyl benzoate, d) Lecithin and fatty acid triglycerides, namely saturated and / or unsaturated, branched and / or unbranched triglycerides of alkyl carboxylic acids with a chain length of 8-24 carbon atoms. e) Dialkyl ethers and dialkyl carbonates, f) Saturated or unsaturated, branched or unbranched alcohols, and g) Alkyl esters of amino acids, especially alkyl esters of lauroyl sarcosine, such as isopropyl lauroyl sarcosine.

21. The dual-gel composition according to any one of claims 1-18, further comprising a UV filter, preferably comprising an organic UV filter and an inorganic UV filter, wherein, The organic UV filter is preferably one or more selected from the group consisting of: Alkyl alkoxycinnamic acid esters such as C1-C10 alkoxycinnamic acid, C2-C10 alkyl esters, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, 3-benzylene camphor, 4-methylbenzylene camphor, benzophenone-3, butylmethoxydibenzoylmethane, diethylhexylbutamidotriazinone, dimethylPABA ethylhexyl ester, ethylhexyl methoxycinnamic acid, ethylhexyl salicylate, ethylhexyl triazinone, and humulone. Amyl methoxycinnamate, methylene bisbenzotriazolyl tetramethylbutylphenol, octocrylene, PEG-25 p-aminobenzoic acid, polyacrylamide methyl benzyl camphor, polysiloxane-15, benzophenone-4, benzophenone-5, benzyl camphor sulfonic acid and its salts, camphor benzalkonium methyl sulfate, disodium phenyl dibenzimidazole tetrasulfonate, phenyl benzimazole sulfonic acid and its potassium, sodium and triethanolamine salts, terephthalimide dicamphor sulfonic acid and its salts. Inorganic UV filters are preferably one or more selected from the group consisting of: Pigments formed from metal oxides, such as titanium dioxide, zinc oxide, iron oxide, zirconium oxide, or cerium oxide, The UV filter content is 0.1-30.0% by weight, based on the total weight of the composition.

22. The bigel composition according to any one of claims 1-18, further comprising a neutralizing agent containing a basic group, the neutralizing agent being one or more selected from the group consisting of: arginine, sodium hydroxide, potassium hydroxide, sodium citrate, triethanolamine, tromethamine, aminomethylpropanol, preferably arginine, triethanolamine, tromethamine, aminomethylpropanol, more preferably arginine, and particularly the neutralizing agent being present in an amount of 0.01-5.00% by weight, based on the total weight of the composition.

23. The bigel composition according to any one of claims 1-18, further comprising one or more components selected from the group consisting of: Ascorbic acid and its derivatives, such as ascorbic acid tetraisopalmitate, L-ascorbic acid 2-glucoside, and vitamin C; Resorcinol and its derivatives; enzymes; Moisturizers, such as hyaluronic acid and its salts, protein hydrolysates, and polyols, such as butylene glycol, propylene glycol, glycerol, dipropylene glycol, diglycerides, etc. Polyethylene glycol; Recombinant collagen; Natural extracts; Anti-inflammatory agents; Oligomeric proanthocyanidins; Vitamins, such as vitamin A (retinol), vitamin E (tocopherol), vitamin B5 (panthenol), vitamin B3 (nicotinamide), derivatives of these vitamins (especially esters), and mixtures thereof; Resveratrol; BHT; ceramides; as well as Ceramide-like substances; Esters of amino acids, such as myristoylmethyl β-alanine (phytosterol / decyltetradecyl) ester; Cholesterol and its derivatives, such as 7-dehydrocholesterol; Steroids; Urea; caffeine; Depigmenting agents such as kojic acid, hydroquinone, and caffeic acid; Salicylic acid and its derivatives; α-Hydroxy acids, such as lactic acid and glycolic acid and their derivatives; Vitamin A-like substances, such as carotenoids and vitamin A derivatives; Hydrocortisone; Melatonin; Extracts of algae, fungi, plants, yeasts, and bacteria, such as licorice extract, including potassium glycyrrhizate, glycyrrhizin, glycyrrhetinic acid, glycyrrhizin chalcone, etc. Antimicrobial agents, such as 2,4,4'-trichloro-2'-hydroxydiphenyl ether (or triclosan), 3,4,4'-trichlorocarbazide (or triclocarban) and the acids mentioned above, and especially salicylic acid and its derivatives; Matting agents, such as those used in fibers; Tensioner.

24. The bigel composition according to any one of claims 1-18, wherein the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer comprises structural units derived from the following monomers: 95.9 to 98.8% by weight of an olefinic unsaturated carboxylic acid monomer, wherein the olefinic unsaturated carboxylic acid monomer is selected from one or more of the group consisting of acrylic acid, methacrylic acid and ethylacrylic acid; 1 to 3.5% by weight of acrylate compounds having the following structural formula, Where R is an alkyl group containing 10 to 30 carbon atoms, and R1 is hydrogen, methyl, or ethyl; and Optionally, 0.1 to 0.6% by weight of a crosslinking agent, such as an alkenyl ether of a polyol and / or a (C1-C2 alkyl) acrylate, each molecule of which contains two or more polymerizable alkenyl groups and / or (C1-C2 alkyl) acrylate groups, wherein the polyol contains at least three carbon atoms and at least two hydroxyl groups, for example at least three hydroxyl groups, said polyol being, for example, an alkylene polyol or an alkylene polyol epoxyalkane adduct.

25. The dual-gel composition according to any one of claims 1-18, wherein the aqueous phase thickener is an aqueous phase emulsifying thickener, and / or the oil phase thickener is an oil phase emulsifying thickener.

26. The bigel composition according to any one of claims 1-18, wherein the (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer is a crosslinked copolymer.

27. The bigel composition according to any one of claims 1-18, comprising the following components: (1) 0.05-5.00% by weight of (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, preferably (C1-C2 alkyl)acrylic acid / acrylic acid C10-C30 alkyl ester crosslinked copolymer; (2) 0.10-10.00% by weight of dextrin palmitate; (3) Optional 0.10-4.00% by weight of sorbitan oleate; (4) Optional 0.10-4.00% by weight of polybutene; (5) 0.01-8.00% by weight of polyglycerol emulsifier with an HLB value of 0 to 8; (6) Optional UV filter of 0.1-30.0% by weight; (7) Optional 0.01-5.00% by weight of arginine; (8) Optional 0.5-20% by weight of a hydrophobic solvent; (9) 20-80% by weight of water.

28. The dual-gel composition according to any one of claims 1-18, for use in cosmetic compositions, particularly sunscreen compositions.

29. The bigel composition of any one of claims 1-18 further comprises polyacrylate crosspolymer-6.

30. The bigel composition of claim 29, wherein the amount of polyacrylate crosspolymer-6 added is 0.05 to 2.00% by weight, based on the total weight of the composition.

31. The dual gel composition of claim 29, wherein the weight ratio of the (C1-C2 alkyl) acrylate / C10-C30 alkyl acrylate crosslinker copolymer to the polyacrylate crosslinker-6 is from 0.3:1 to 8:

1.

32. The dual-gel composition according to any one of claims 1-18, further comprising a UV filter.

33. The dual-gel composition of claim 32, wherein the amount of UV filter added is 0.1 to 30.0% by weight, based on the total weight of the composition.

34. The bigel composition according to any one of claims 1-18, further comprising a light-stabilizing enhancer.

35. The bigel composition of claim 34, wherein the amount of the light-stabilizing enhancer added is 0.05-10% by weight, based on the total weight of the composition.

36. A method for preparing a bigel composition according to any one of claims 1-35, comprising the following steps: i) Mix water, (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer, and optionally a neutralizing agent to obtain the aqueous phase composition; ii) Mix the oil phase thickener, polyglycerol emulsifier, and optionally a hydrophobic solvent, optionally an oil-soluble active ingredient, and / or optionally a UV filter to obtain the oil phase composition; iii) Add the oil phase component to the aqueous phase component and mix to obtain the bigel composition.

37. The method for preparing a bigel composition as described in claim 36, further comprising the following step: iv) Based on step iii), polyacrylate crosslinking polymer-6 is added to obtain a bigel composition with good UV stability.

38. A bigel composition prepared by the method of claim 36 or 37.

39. Use of the dual-gel composition according to any one of claims 1-38 in the preparation of cosmetics, particularly sunscreen cosmetics.

40. The use as described in claim 39, wherein the sunscreen cosmetic comprises a UV filter, preferably an inorganic UV filter, and most preferably a combination of inorganic and organic UV filters.

41. A sunscreen composition comprising the following components: (1) (C1-C2 alkyl)acrylic acid / (C1-C2 alkyl)acrylic acid C10-C30 alkyl ester copolymer as an aqueous thickener; (2) Polyacrylate crosspolymer-6; (3) Oil phase thickener; (4) A polyglycerol emulsifier with an HLB value of 0 to 8, preferably 1 to 8, more preferably 3 to 8; (5) UV filter; (6) Solvent.

42. The sunscreen composition of claim 41, wherein the UV filter comprises an inorganic UV filter, preferably a combination of inorganic and organic UV filters.

43. The sunscreen composition of claim 42 further comprises a photostable enhancer, preferably a water-soluble polar solvent, more preferably one or more selected from the group consisting of polyol derivatives, polyether compounds and polyethylene glycols, and even more preferably polyethylene glycols with a molecular weight <700.

44. The sunscreen composition of claim 43, wherein the oil phase thickener comprises one or more selected from the group consisting of: (i) cellulose derivatives; (ii) dextrin / inulin fatty acid esters; (iii) glutamic acid and its derivatives; (iv) eicosanoic acid and its derivatives; (v) polyamides; (vi) isophorone diisocyanate (IPDI) copolymers or sebacic acid copolymers; (vii) crosslinked polymers containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionic acid; (viii) hydroxystearic acid and its derivatives; (ix) polybutene; (x) waxes; (xi) sorbitan esters; and (xii) sucrose fatty acid esters.

45. The sunscreen composition of claim 44, wherein: The cellulose class includes ethyl cellulose; The dextrin / inulin fatty acid ester is selected from one or more substances from the group consisting of dextrin palmitate and stearoyl inulin. The glutamic acid and its derivatives are selected from one or more substances from the group consisting of: dibutyllauroyl glutamine and dibutylethylhexanoyl glutamine; The eicosanoic acid and its derivatives are selected from one or more substances in the group consisting of: glycerol tris(behenic acid / isostearate / eicosanoic acid) ester, glycerol behenic acid ester / eicosanoic acid ester; The polyamide is selected from one or more substances from the group consisting of polyamide-8 and polyamide-3; The isophorone diisocyanate (IPDI) copolymer or sebacic acid copolymer is selected from one or more of the group consisting of castor oil / IPDI copolymer and hydrogenated castor oil / sebacic acid copolymer; The crosslinked polymer containing repeating units derived from hexamethylene-1,6-diisocyanate (HDI) and trimethylolpropionate is selected from one or more of the group consisting of: caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), and HDI / trimethylolpropionate crosslinked polymer. The hydroxystearic acid and its derivatives are selected from one or more substances from the group consisting of: trihydroxystearin, 9-hydroxystearic acid, 10-hydroxystearic acid and 12-hydroxystearic acid; The polybutene is preferably polybutene with a kinematic viscosity of 11-45000 centistokes as determined by ASTM D445A at 100°C. The wax is selected from one or more substances from the group consisting of: paraffin wax, microcrystalline wax, ceresin wax, synthetic wax, polyethylene, triglyceride, and glyceryl behenate. The sucrose fatty acid ester is obtained by esterification of sucrose with fatty acids, preferably C12–C22, including saturated and mono / polyunsaturated fatty acids. The sucrose fatty acid ester has an HLB value of 1–8 and is selected from one or more substances grouped from the group consisting of: sucrose stearate, sucrose palmitate, sucrose laurate, and sucrose oleate; and The sorbitol esters include sorbitan olive oil esters, preferably including one or more selected from the group consisting of sorbitan olive oil esters and dextrin palmitate esters.

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