Natural cosmetic composition

Abstract

The present invention relates to a cosmetic composition comprising rice starch (INCI rice (rice) starch) and at least one natural organic thickener, and the use of a combination of rice starch (INCI rice (rice) starch) and at least one natural organic thickener for stabilization.

Description

Technical Field

[0001] This invention relates to a cosmetic composition comprising rice starch (INCI rice (Oryza Sativa) starch) and a natural organic thickener, and the use of the combination of rice starch (INCI rice (Oryza Sativa) starch) and a natural organic thickener for stabilizing the cosmetic composition. Background Technology

[0002] Cosmetic compositions represent an ubiquitous part of modern life. They include leave-in and rinse-out products such as skin and body care, including daily care compositions and sunscreens, hair care, including shampoos, conditioners, shower gels, cosmetics, and many other products. The requirements for these cosmetic compositions are constantly increasing, whether in terms of performance, sustainability, or cost. In particular, the sustainability of cosmetic compositions is becoming increasingly relevant to consumers and regulators.

[0003] In this regard, the common use of microplastics and synthetic polymers in cosmetic compositions has been subject to increasing scrutiny. There is a growing consumer demand for cosmetics that are generally free of microplastics and, additionally, synthetic polymers. Therefore, cosmetic compositions that are generally free of both microplastics and synthetic polymers are desirable.

[0004] Another important aspect of sustainability is the source of materials. In this regard, bio-based materials are becoming increasingly popular. Compared to materials derived from fossil resources, such as synthetic polymers, bio-based materials have a significantly smaller carbon footprint. Unfortunately, these materials typically do not offer the same properties as conventional materials derived from fossil resources.

[0005] A crucial requirement for cosmetic compositions is formulation stability, especially over extended storage periods. This is particularly challenging for sunscreens due to the diverse number of components they typically contain, such as liquid or solid water-soluble or oil-soluble UV filters, particulate UV filters, solubilizers, emulsifiers, etc. Sunscreens often have high oil loadings, which affect the physical (macro) stability of the formulation and make it difficult to obtain high-viscosity compositions. Sunscreens are also used under extreme temperature conditions, such as hot summers or cold winters, which presents another challenge to the stability of sunscreen products.

[0006] These factors can contribute to the separation of components or phases within a cosmetic composition, resulting in an inhomogeneous composition. This process may occur rapidly over days or slowly over weeks or months. However, the formation of an inhomogeneous, unstable composition can significantly affect the appearance, sensory properties, or even the performance of a personal care product. For example, an inhomogeneous, unstable sunscreen composition may no longer provide the promised and expected UV protection.

[0007] Therefore, there is a continued need to develop sustainable cosmetic compositions that are free of microplastics and have good medium- to long-term stability. Summary of the Invention

[0008] Therefore, the object of the present invention is to provide a cosmetic composition comprising bio-based materials.

[0009] Furthermore, the object of the present invention is to provide a cosmetic composition that is particularly sustainable due to bio-based materials.

[0010] Furthermore, the object of the present invention is to provide a cosmetic composition that does not contain microplastics and / or synthetic polymer materials.

[0011] Another object of the present invention is to provide a cosmetic composition with high macroscopic stability and long-term storage stability.

[0012] Another object of the present invention is to provide a high-viscosity cosmetic composition suitable for various personal care applications.

[0013] According to a first aspect, the present invention relates to a cosmetic composition comprising rice starch (INCI rice starch) and at least one natural organic thickener, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter. It has been found that at least one of the objects of the invention can be achieved using this cosmetic composition.

[0014] During a comprehensive study of potential bio-based materials for use in cosmetic compositions with or without UV protection, such as sunscreens or daily care compositions, it was unexpectedly discovered that combining a specific type of starch derived from rice, namely rice starch (INCI rice (rice) starch), with at least one natural organic thickener significantly improves the stability of the cosmetic composition. Interestingly, neither rice starch nor the natural organic thickener alone provides sufficient stability for the cosmetic composition. However, the combination of these two bio-based materials allows for the provision of high-viscosity cosmetic compositions that remain stable for weeks and months. When these two bio-based materials are used in combination, no additional synthetic polymer-based thickeners, synthetic polymer binders, synthetic polymer water-retaining agents, or any type of synthetic polymer material are required to obtain cosmetic compositions with excellent viscosity properties. This remains true even for sunscreen compositions with particularly complex ingredient compositions (with high oil loadings).

[0015] Unbound by any particular scientific theory, it appears that the interaction between rice starch (INCI rice starch) and at least one natural organic thickener provides the formulation with a stable and durable structure. The viscosity of the composition remains stable even over extended storage periods.

[0016] A second aspect of the invention relates to the use of a combination of rice starch (INCI rice starch) and at least one natural organic thickener for stabilizing cosmetic compositions, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter. As stated with respect to the first aspect of the invention, it has been unexpectedly found that the combination of rice starch (INCI rice starch) and a natural organic thickener effectively stabilizes cosmetic compositions. These two components provide the necessary structural integrity for different types of cosmetic compositions and provide long-term stability to these cosmetic compositions.

[0017] A third aspect of the invention relates to the use of a combination of rice starch (INCI rice starch) and at least one natural organic thickener for increasing the viscosity of a cosmetic composition, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter.

[0018] A fourth aspect of the invention relates to a method for preparing the cosmetic composition of the invention, the method being carried out by providing rice starch (INCI rice starch), at least one natural organic thickener and other ingredients for the cosmetic composition, mixing the rice starch (INCI rice starch), at least one natural organic thickener and other ingredients to obtain the cosmetic composition, wherein the cosmetic composition contains less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition contains at least one organic or inorganic UV filter.

[0019] The invention will be described with reference to specific embodiments and certain examples, but the invention is not limited thereto and is limited only by the appended claims.

[0020] definition

[0021] As used in this specification and the appended claims, unless the context clearly specifies otherwise, the singular form “a / an” also includes the corresponding plural. In the context of this invention, the terms “about” and “approximately” indicate a range of precision that, as will be understood by those skilled in the art, still ensures the technical effect of the features discussed. This term typically indicates a deviation from the indicated numerical value by ±20%, preferably ±15%, more preferably ±10%, and even more preferably ±5%. It should be understood that the term “comprising” is not limiting. For the purposes of this invention, the term “consisting of” is considered a preferred embodiment of the term “comprises from”. If a group is defined below as including at least a certain number of embodiments, this means that a group preferably consisting only of those embodiments is also covered. Furthermore, the terms “first,” “second,” “third,” or “(a),” “(b),” “(c),” “(d),” etc., in the specification and claims are used to distinguish similar elements and are not necessarily used to describe a sequential or chronological order. It should be understood that the terms thus used are interchangeable where appropriate, and the embodiments of the invention described herein can operate in orders other than those described or shown herein. In cases where the terms “first,” “second,” “third,” or “(a),” “(b),” “(c),” “(d),” “i,” “ii,” etc., refer to steps of a method, use, or experiment, there is no temporal or time interval coherence between these steps; that is, these steps may be performed simultaneously or there may be time intervals of seconds, minutes, hours, days, weeks, months, or even years between such steps, unless otherwise indicated in this application as stated above or below. It should be understood that the invention is not limited to the specific methods, schemes, reagents, etc., described herein, as these can vary. It should also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of the invention, which is to be limited only by the appended claims. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0022] As used herein, the terms “does not contain / comprise” or “does not contain…” in the context mean that the compositions of the present invention do not contain a specific compound or group of compounds (which may be grouped together under a certain set of terms), and that the compositions do not contain more than 0.8% of the compound or group of compounds by weight based on the total weight of the compositions. Furthermore, it is preferred that the compositions according to the present invention do not contain more than 0.5% of the compound or group of compounds by weight, and preferably the compositions do not contain the compound or group of compounds at all.

[0023] When referring to the composition and the weight percentage of the components contained therein, it should be understood that, according to the invention, the total amount of the components does not exceed 100% (±1%, due to rounding).

[0024] The prefixes Cn-Cm indicate the possible number of carbon atoms in the group in each case.

[0025] The term "C12-C15 alkyl benzoate" refers to an ester of benzoic acid with a fatty alcohol containing a C12-C15 alkyl chain. A C12-C15 alkyl chain is defined as an alkyl chain having a C12, C13, C14, or C15 chain length.

[0026] As used herein, the term “Cn-Cm carboxylic acid” refers to a straight-chain or branched carboxylic acid having from n to m carbon atoms, such as 6 to 24 carbon atoms, in each case.

[0027] As used herein, the term “Cn-Cm alcohol” refers to a straight-chain or branched alcohol having from n to m carbon atoms in each case, such as having from 3 to 24 carbon atoms, or from 6 to 24 carbon atoms, or from 1 to 22 carbon atoms.

[0028] As used herein, the term “C2-C12 dicarboxylic acid” refers to a dicarboxylic acid having 2 to 12 carbon atoms in each case, such as succinic acid, pentanedioic acid / glutaric acid, hexanedioic acid / adipic acid, or decanedioic acid / sebacic acid.

[0029] As used herein, the term "dialkyl ether" means, in each case, a straight-chain or branched dialkyl ether having a total of 12 to 36 carbon atoms and comprising at least one ether moiety.

[0030] As used herein, the term “C6-C22 alcohol carbonate” refers to a straight-chain or branched alcohol carbonate having 6 to 22 carbon atoms in each case and containing at least one functional group consisting of a carbonyl group with two alkoxy groups attached to it.

[0031] As used herein, the term "alkyl" means, in each case, a straight-chain or branched alkyl group having, exemplary, from 1 to 18 carbon atoms. Examples of alkyl groups are methyl, ethyl, n-propyl, isopropyl, n-butyl, 2-butyl, isobutyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, 1-ethylpropyl, n-hexyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl, 1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-ethyl-1-methylpropyl, and 1-ethyl-2-methylpropyl.

[0032] As used herein, the term "alkoxy" refers in each case to a straight-chain or branched alkyl group bonded by an oxygen atom and typically having from 1 to 20 carbon atoms. Examples of alkoxy groups are methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, 2-butoxy, isobutoxy, tert-butoxy, etc.

[0033] As used herein, the term "carboxyl" includes carboxymethyl, carboxyethyl, carboxypropyl, carboxyisopropyl, carboxybutyl, carboxyisobutyl, carboxypentyl, carboxyhexyl, carboxyheptyl, carboxyoctyl, carboxyisooctyl, carboxynonyl, carboxydecyl, carboxyundecyl, carboxydodecyl, carboxytetradecyl, carboxyhexadecyl, and carboxyoctadecyl, preferably carboxymethyl.

[0034] As used herein, the term "cycloalkyl" generally refers to a monocyclic alicyclic group having from 3 to 10 or from 5 to 8 carbon atoms in each case, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, and cyclodecyl, or cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.

[0035] As used herein, the term “substituted” means that the hydrogen atom bonded to the specified atom is replaced by a specific substituent, provided that the substitution produces a stable or chemically viable compound. Unless otherwise indicated, the substituted atom may have one or more substituents, and each substituent is chosen independently.

[0036] The term "cosmetic composition" refers to any topical product intended for application to the human body for cleansing, beautifying, enhancing attractiveness, altering appearance, or protecting the skin without affecting the structure or function of the body. Within the meaning of this invention, possible cosmetic compositions include leave-in and rinse-off products, such as facial and body care products, including daily care compositions with or without UV protection, as well as sunscreens and sunblock compositions, hair care products such as shampoos, conditioners, shower gels, cosmetic compositions, and similar compositions.

[0037] The term "sunscreen composition" or "sunscreen agent" refers to any topical product that absorbs and can further reflect and scatter some portions of UV radiation. Therefore, the term "sunscreen composition" should be understood to include not only sunscreen compositions but also any cosmetic composition that provides UV protection. The term "topical product" refers to a product applied to the skin and can refer to, for example, a spray, lotion, cream, oil, foam, powder, or gel. According to the invention, a sunscreen composition may contain one or more active agents, such as organic and inorganic UV filters, as well as other ingredients or additives, such as emulsifiers, emollients, viscosity modifiers, stabilizers, preservatives, or fragrances.

[0038] The term "daily care composition" refers to any topical product intended for daily use, with or without UV protection. When UV protection is included, it absorbs and can further reflect and scatter UV radiation on certain parts of the body and is used as a daily care product for the human body (e.g., face or body). Daily care compositions may contain one or more active agents, such as organic and / or inorganic UV filters, as well as other ingredients or additives, such as emulsifiers, emollients, viscosity modifiers, stabilizers, preservatives, or fragrances. According to the invention, suitable daily care compositions are, for example, leave-on facial and body care products.

[0039] Suitable leave-on products for the face and body include, for example, sunscreens and skin care products.

[0040] Suitable skin care formulations include, for example, moisturizing, anti-aging, improving, and lifting formulations. The listed leave-on compositions can be in the form of creams, ointments, pastes, foams, gels, emulsions, powders, cosmetics, sprays, sticks, or aerosols. Daily care compositions with UV protection safeguard human skin from harmful UV rays.

[0041] As used herein, the term "UV filter" or "ultraviolet filter" refers to an organic or inorganic compound that can absorb and further reflect and scatter UV radiation caused by sunlight. UV filters can be classified as UV-A, UV-B, or broadband filters based on their UV absorbance distribution. Preferably, the term "UV filter" includes any UV filter or a component thereof as defined in Annex VI of Regulation (EC) No. 1223 / 2009 of the European Parliament (version of which date is 11 November 2022).

[0042] The term "stable cosmetic composition" is defined according to the present invention as a stable cosmetic composition with structural integrity. The structural integrity of a stable cosmetic composition is preferably determined by: visual assessment (macroscopic stability) over time at different storage temperatures, microscopic assessment, centrifugal analysis, and measurements of viscosity and pH over time; most preferably, stability is determined by visual assessment. Visual assessment is performed by determining whether the composition remains homogeneous (e.g., no oil release, no water separation) via eye tests. Centrifugal assessment can be used as an accelerated stability test. To determine whether the combination of rice starch and the natural organic thickener contributes to the stability of the cosmetic composition, the stability of the cosmetic composition is evaluated once without the combination of rice starch and the natural organic thickener and once with the combination of rice starch and the natural organic thickener, using one of the methods mentioned in the preceding sentences. It was found that using this combination produced a more stable cosmetic composition compared to compositions not containing the combination of rice starch and the natural organic thickener of the present invention.

[0043] The water-soluble UV filter has a solubility in water of at least 2% by weight, preferably at least 3% by weight, and more preferably at least 5% by weight.

[0044] The oil-soluble filter has a solubility of at least 2% by weight, preferably at least 3% by weight, and more preferably at least 5% by weight in a particular emollient.

[0045] The term "emollient" refers to cosmetic oils used to protect, moisturize, and lubricate the skin. The word "emollient" is derived from the Latin word *mollire*, meaning to soften. Typically, emollients prevent moisture from evaporating from the skin by forming a occlusive coating. Alternatively or additionally, emollients improve the distribution of products on the skin. Emollients can be classified into different groups based on their polarity index.

[0046] The term "sensitive skin" refers to skin whose natural barrier function has been weakened and damaged due to triggering factors. Triggers can be, for example, cold weather, extremely hot water, and key ingredients that may be included in sunscreen or daily care compositions.

[0047] As used herein, the term "Sun Protection Factor (SPF)" indicates the degree to which a sunscreen composition protects the skin from primarily UV-B radiation. Specifically, this factor indicates how long protected skin can be exposed to sunlight without sunburn compared to untreated skin. For example, if a sunscreen composition with an SPF of 15 is applied evenly to the skin of someone who typically gets sunburned after 10 minutes in the sun, the sunscreen allows that person to stay in the sun 15 times longer. In other words, SPF 15 means that 1 / 15 of the intense UV radiation will reach the skin, assuming a thick, evenly applied dose of sunscreen at 2 mg / cm².

[0048] The definition of “broadband” protection (also known as broad-spectrum or wide-range protection) can be based on, for example, “critical wavelength” or UVA-PF. For broadband coverage, both UV-B and UV-A protection must be provided. According to US requirements, a critical wavelength of at least 370 nm is needed to achieve broad-spectrum protection. Furthermore, the European Commission recommends that all sunscreen or cosmetic compositions should have a UV-A protection factor that is at least one-third of the stated sun protection factor (SPF); for example, if a sunscreen composition has an SPF of 30, then the UVA protection factor must be at least 10.

[0049] The term "critical wavelength" is defined as a wavelength at which the area under the UV protection curve (protection percentage relative to wavelength) occupies 90% of the total area under the curve in the UV region (290-400 nm). For example, a critical wavelength of 370 nm indicates that the protection of a sunscreen composition is not limited to the wavelength of UV-B (i.e., the wavelength of 290-320 nm), but extends to 370 nm, such that at least 90% of the total area under the protection curve in the UV region is reached at 370 nm.

[0050] The term "application" refers to the act of applying a sunscreen or daily care composition to a person's skin.

[0051] Unless otherwise stated, in this invention, the term "rice starch" refers to rice starch (INCI rice (rice) starch).

[0052] The term "natural" in "natural organic thickener" means a component that is wholly or at least partially, preferably wholly derived from natural resources. Natural resources are any biological or mineral assets provided by nature. Natural resources within the meaning of this invention include, in particular, plants, forests, vegetation, surface and groundwater, fertile land, soil, and minerals. Natural resources within the meaning of this invention do not include products derived from fossil resources, such as petroleum, natural gas, crude oil, or coal. An alternative term for "natural" in this invention is the term "bio-based." These terms are intended to be used interchangeably in this invention. Where the term "natural" is used in a context different from that of "natural organic thickener," unless otherwise stated, the meaning of the term is the same as that defined for "natural organic thickener."

[0053] In the context of “natural organic thickeners,” the term “organic” refers to an organic compound or mixture of organic compounds. An organic compound is any of a broad class of compounds in which one or more carbon atoms are covalently bonded to atoms of other elements, most commonly carbon, hydrogen, oxygen, or nitrogen. A minority of carbonaceous compounds not classified as organic include carbides, carbonates, and cyanides. Where the term “organic” is used in a context different from that of “natural organic thickeners,” it has the same meaning as defined for “natural organic thickeners,” unless otherwise stated.

[0054] The term "thickener" in "natural organic thickener" refers to a component that increases the viscosity of a mixture. Thickeners can cause an increase in the viscosity of a composition, for example, by binding with liquids present in the composition, particularly water. In some cases, a thickener may gel upon contact with water. In other cases, a thickener may not gel upon contact with water. Those skilled in the art are familiar with typical thickeners and their general properties. The terms "thickener" and "thickening agent" are intended to be used interchangeably in this invention. Where the term "thickener" is used in a context different from that of "natural organic thickener," unless otherwise stated, the term has the same meaning as defined for "natural organic thickener."

[0055] The term "synthetic thickener" refers to a thickener as defined above, however, derived from fossil resources, particularly from petroleum and natural gas, through several reaction and processing steps. Synthetic thickeners are artificially manufactured through synthesis and processing. Types of synthetic thickeners include synthetic polymers and microplastics with thickening activity. Common synthetic thickeners are polyacrylates or network acrylic homopolymers or polyacrylamides (such as carbomer), acrylate copolymers, acrylate / C10-C30-alkyl acrylate crosspolymers, acrylate / betaine-25 methacrylate copolymers, VP / eicosene copolymers, VP / hexadecene copolymers, and triacontyl PVP. Preferably, the cosmetic compositions of the present invention are free of synthetic thickeners.

[0056] The term "microplastic" herein refers to solid particles made from synthetic polymers. Some synthetic thickeners can be microplastics, and vice versa. Solid particles of microplastics are generally insoluble in water and preferably have a particle size distribution Dv50 of less than 5 mm. Examples of microplastics used in cosmetic compositions in the art are styrene / PVP or styrene-acrylamide copolymers, polyamide derivatives such as nylon-12, polymethyl methacrylate, and polyethylene. It is also preferred that the cosmetic compositions of the present invention are free of microplastics.

[0057] The term "synthetic polymeric materials" herein refers to polymeric materials derived from fossil resources, particularly petroleum and natural gas, through a series of reaction and processing steps. The term "polymeric materials" herein refers to materials composed of large molecules called macromolecules, which are composed of repeating subunits chemically bonded to form long polymer chains. Polymeric materials are obtained via the polymerization of numerous small molecules called monomers. Synthetic thickeners and microplastics are part of the group "synthetic polymeric materials".

[0058] Statements regarding the components, features, or characteristics of the first aspect of the invention also apply equally to the other aspects of the invention. Statements regarding the components, features, or characteristics of the second aspect of the invention also apply equally to the other aspects of the invention. Statements regarding the components, features, or characteristics of the third aspect of the invention also apply equally to the other aspects of the invention. Statements regarding the components, features, or characteristics of the fourth aspect of the invention also apply equally to the other aspects of the invention. Detailed Implementation

[0059] A first aspect of the invention relates to a cosmetic composition comprising rice starch (INCI rice starch) and at least one natural organic thickener, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter. The combination of rice starch and at least one natural organic thickener in the cosmetic composition provides stability and structural integrity for several weeks to several months. The combination of rice starch (INCI rice starch) and at least one natural organic thickener increases the viscosity of the cosmetic composition and allows such compositions to be used in many different application areas within cosmetics. The combination of these two components produces an unexpected synergistic effect that is significantly greater than the effect of using rice starch or at least one natural organic thickener alone. Furthermore, compositions comprising rice starch (INCI rice starch) and at least one natural organic thickener have a lower carbon footprint and increased sustainability compared to compositions based on conventional stabilizing systems (which are based on synthetic thickeners). Cosmetic compositions can also exhibit higher biodegradability than compositions based solely on components derived from fossil resources, and can be free of synthetic polymers and microplastics.

[0060] Generally, a wide range of different types of natural organic thickeners can be used in this invention. According to a preferred embodiment of the invention, the natural organic thickener is selected from the group consisting of polysaccharides, polypeptides, proteins, and mixtures thereof. Polysaccharides, polypeptides, proteins, and mixtures thereof have been found to be particularly well-suited as natural organic thickeners in combination with rice starch (INCI rice starch). Furthermore, polysaccharides, polypeptides, and proteins are readily available in nature and can be entirely bio-based.

[0061] According to another preferred embodiment of the invention, the natural organic thickener is a polysaccharide selected from the group consisting of: natural gums, pectin, cellulose, chitin, guaiac-glucan, and mixtures thereof. Polysaccharides are readily available in nature, completely bio-based, and effective in binding water. Natural gums, pectin, cellulose, chitin, guaiac-glucan, and mixtures thereof are common polysaccharides found in nature. Furthermore, these polysaccharides exhibit good biodegradability and are particularly compatible with other typical cosmetic ingredients.

[0062] According to particularly preferred embodiments, the natural organic thickener is a natural gum selected from the group consisting of: agar, alginate / sodium alginate (algin), carrageenan, gum arabic, solanum, tragacanth, carrageenan, locust bean gum, β-glucan, damar gum, glucomannan, psyllium husk, tara gum (a type of gum), gellan gum, xanthan gum, and mixtures thereof. Natural gums have been found to be excellent thickeners when combined with rice starch (INCI rice starch). They are readily available and economical.

[0063] The most preferred type of natural organic thickener is a natural gum selected from the group consisting of xanthan gum, tara gum, alginate / sodium alginate, and mixtures thereof. According to one embodiment of the invention, the natural organic thickener is xanthan gum. According to another embodiment of the invention, the natural organic thickener is tara gum. According to yet another embodiment of the invention, the natural organic thickener is alginate / sodium alginate. Xanthan gum, tara gum, and alginate are excellent natural thickeners, and when combined with rice starch, these thickeners are particularly effective at binding other components of the cosmetic composition.

[0064] The rice starch (INCI rice starch) granules used in this invention can be provided in different forms or shapes. According to one embodiment, the rice starch (INCI rice starch) granules have a polygonal granule shape. The term "polygonal granule shape" herein means that at least 75% of the number of granules in the rice starch (INCI rice starch) sample has three or more vertices or corners, preferably four or more vertices or corners, and even more preferably five or more vertices or corners, as identified by electron microscopy. Rice starch (INCI rice starch) granules with a polygonal granule shape are particularly well-suited for providing excellent structural integrity for cosmetic compositions.

[0065] The rice starch (INCI rice starch) used in this invention can also have different particle size distributions. According to a preferred embodiment, the rice starch (INCI rice starch) has a particle size distribution Dv50 of 2 to 10 μm, particularly 6 to 8 μm, as determined by static laser scattering. Rice starch with such a Dv50 value has been found to be particularly suitable for providing optimal structural stability for cosmetic compositions.

[0066] The particle size distribution Dv50 of rice starch (INCI rice starch) is preferably determined by static laser scattering. In this invention, the Dv50 value is determined using the general liquid module of a Beckman Coulter LS-13 230 particle size analyzer with PIDS using static laser scattering, with a 2% suspension of rice starch in deionized water.

[0067] The rice starch (INCI rice starch) used in the compositions of the present invention has the ability to effectively bind liquids such as oil. Preferably, the rice starch (INCI rice starch) has an oil absorption capacity of 0.5 to 1.0 g, more preferably 0.7 to 0.8 g oil / 1.0 g starch. With this oil absorption capacity of the rice starch used, the cosmetic composition has particularly high viscosity and structural integrity.

[0068] Methods for determining the oil absorption capacity of starch are known in the art. The oil absorption capacity of rice starch (INCI rice starch) can be determined by mixing a weighed sample of rice starch with excess oil in a weighed centrifuge tube to obtain a dispersion, centrifuging the dispersion, completely removing the supernatant, and then weighing the centrifuge tube containing starch and the oil absorbed by the starch.

[0069] The amount of rice starch (INCI rice starch) in the cosmetic compositions of the present invention can vary widely depending on the relevant cosmetic application. With all other components equal, a larger amount of rice starch can result in a higher viscosity and thicker cosmetic composition, while a smaller amount of rice starch will generally result in a lower viscosity composition. According to a preferred embodiment of the invention, the amount of rice starch (INCI rice starch) in the cosmetic composition is 0.6 to 10.0 wt.% based on the total weight of the cosmetic composition. A range of 0.6 to 10.0 wt.% of rice starch (INCI rice starch) is particularly well-suited for obtaining cosmetic compositions with excellent long-term stability. According to a particularly preferred embodiment of the invention, the amount of rice starch (INCI rice starch) in the cosmetic composition is 1.0 to 8.0 wt.%, more preferably 1.5 to 6.0 wt.%, and most preferably 1.5 to 4.0 wt.%, each based on the total weight of the cosmetic composition.

[0070] The cosmetic compositions of the present invention comprise at least one natural organic thickener. According to a preferred embodiment of the invention, the amount of the natural organic thickener is at least 0.05 wt.%, preferably 0.05 to 5 wt.%, based on the total weight of the cosmetic composition. Amounts of 0.08 to 3 wt.%, preferably 0.1 to 2 wt.%, more preferably 0.15 to 1 wt.%, and most preferably 0.2 to 0.5 wt.%, each based on the total weight of the cosmetic composition, of the natural organic thickener are found to be particularly well-suited for providing structural integrity to the cosmetic compositions of the present invention.

[0071] In this invention, it has been found that rice starch (INCI rice starch), in combination with at least one natural organic thickener, provides a stable, sufficiently viscous, and homogeneous cosmetic composition. Typically, the cosmetic compositions of this invention may also contain other starches, such as wheat, potato, corn, maize, cassava, arrowroot, or tapioca starch. However, according to a preferred embodiment of the invention, the cosmetic composition does not contain starch other than rice starch (INCI rice starch). The term "does not contain starch other than rice starch" means herein that the cosmetic composition preferably does not contain more than 0.1 wt.%, preferably no more than 0.05 wt.%, and even more preferably no more than 0.01 wt.% of starch from other sources. It is advantageous to have only rice starch as the starch component in the composition, as other starch components may affect the rheological properties of the composition.

[0072] The cosmetic compositions of the present invention further comprise at least one organic or inorganic UV filter. The presence of at least one organic or inorganic UV filter provides protection of the skin from harmful UVA and UVB radiation.

[0073] Preferably, at least one organic or inorganic UV filter is selected from the group consisting of:

[0074] UVA Absorbing Filter

[0075] -4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI Butylmethoxydibenzoylmethane)

[0076] -2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI diethylaminohydroxybenzoyl hexyl benzoate),

[0077] -[(3Z)-3-[[4-[(Z)-[7,7-dimethyl-2-oxo-1-(sulfonylmethyl)-3-bicyclo[2.2.1]heptyl]methyl]phenyl]methylene]-7,7-dimethyl-2-oxo-1-bicyclo[2.2.1]heptyl]methanesulfonic acid (INCI terephthalimide dicamphor sulfonic acid),

[0078] Sodium phenyldibenzimidazole tetrasulfonate

[0079] -1,1'-(1,4-piperazindiyl)bis[1-[2-[4-(diethylamino)-2-hydroxybenzoyl]phenyl]-methyl ketone (INCI bis-(diethylaminohydroxybenzoylbenzoyl)piperazine),

[0080] -2-ethoxyethyl(2Z)-2-cyano-2-[3-(3-methoxypropylamino)cyclohexyl-2-en-1-yl]acetate (INCI methoxypropylaminocyclohexeneylethoxyethyl cyanoacetate);

[0081] Broad-spectrum (UVA+UVB) absorption filter

[0082] -2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexyloxyphenylmethoxyphenyltriazine),

[0083] -2,2'-Methylenebis[6-(2H-1,2,3-benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol](INCI methylenebis-benzotriazolyltetramethylbutylphenol),

[0084] -2-(2H-benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]-1-disiloxyl]propyl]phenol (INCI cresoltrazol trisiloxane),

[0085] -Phenylidene bis-diphenyltriazine,

[0086] - Zinc oxide,

[0087] UVB Absorbing Filter

[0088] 2-Phenylacetic-1H-benzimidazole-5-sulfonic acid (INCI phenylbenzimidazole sulfonic acid),

[0089] -Tri-biphenyltriazine,

[0090] -4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone),

[0091] -(RS)-2-ethylhexyl-2-hydroxybenzoate (INCI ethylhexyl salicylate),

[0092] - Diethyl polydimethylsiloxane benzylmalonate (INCI polysiloxane-15)

[0093] -Diethylhexylbutamidotriazinone

[0094] -Titanium dioxide,

[0095] -Cerium oxide;

[0096] And their mixtures. These UV filters are commonly used UV filters with excellent UV protection properties.

[0097] According to another preferred embodiment of the invention, at least one organic or inorganic UV filter is an organic UV filter selected from the group consisting of: 4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI butylmethoxydibenzoylmethane), 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI diethylaminohydroxybenzoylhexyl benzoate), 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexyloxyphenylmethoxyphenyltriazine), 4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone), and mixtures thereof. These UV filters are particularly effective at absorbing UV radiation and have a good eco-footprint.

[0098] In a particularly preferred embodiment of the invention, the cosmetic composition comprises at least one UV-A filter and at least one UV-B filter. More preferably, the cosmetic composition also comprises at least one broadband UV filter. The most preferred UV-A filter is 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI diethylaminohydroxybenzoyl hexyl benzoate) and / or butylmethoxydibenzoylmethane. The most preferred UV-B filter is 4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone). The most preferred broadband UV filter is 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexyloxyphenylmethoxyphenyltriazine). 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI) The combination of diethylaminohydroxybenzoylhexylbenzoate, 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexyloxyphenylmethoxyphenyltriazine) and 4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone) is particularly preferred because it covers the entire UV absorption spectrum relevant to skin protection in a highly effective manner. However, combinations of other UV filters for optimal UV-A and UV-B protection are also possible.

[0099] According to another preferred embodiment, the cosmetic composition is free of all of the following UV filters: 2-cyano-3,3-diphenyl-2-acrylate 2-ethylhexyl ester (INCI octocrylene), (RS)-2-ethylhexyl-(2E)-3-(4-methoxyphenyl)prop-2-enoate (INCI ethylhexyl methoxycinnamate), and 3,3,5-trimethylcyclohexyl salicylate (INCI homosalate). There is growing concern about the potential negative health and / or environmental effects of these UV filters. Therefore, it is preferred that the cosmetic composition be free of these filters.

[0100] The cosmetic compositions of the present invention preferably contain additives, particularly additives selected from the group consisting of: emulsifiers, emollients, additional viscosity modifiers (thickeners), sensory enhancers, adjuvants, preservatives, fragrances, and combinations thereof.

[0101] Preferred emulsifiers include

[0102] - Glucose derivatives, such as cetyl glucoside, arachidonic glucoside, lauryl glucoside, polyglycerol-3-methyl glucose distearate, and methyl sesquistearate glucose.

[0103] - Sucrose derivatives, such as sucrose polystearate and sucrose palmitate;

[0104] -Sorbitol derivatives;

[0105] - Glycerides of fatty acids, such as glyceryl stearate and glyceryl oleate;

[0106] - Glutamic acid derivatives, such as sodium stearoyl glutamate;

[0107] - Sulfosuccinic acid derivatives, such as disodium cetearyl sulfosuccinate;

[0108] - Phosphoric acid derivatives, such as cetyl phosphate potassium;

[0109] - Polyglycerol-based fatty acid esters, such as polyglycerol-3-diisostearate and polyglycerol-2-dipolyhydroxystearate;

[0110] -Oxylenized organic modified silicone / polysiloxane / polyalkyl / polyether copolymers and derivatives.

[0111] Preferred emollients include

[0112] -Esters of straight-chain or branched fatty acids with straight-chain or branched fatty alcohols, such as propyl heptyl octanoate, coco caprylate, isopropyl myristate, and ethylhexyl palmitate.

[0113] - Esters of aromatic carboxylic acids with straight-chain or branched fatty alcohols, such as benzoic acid C 12 -C 15 -Alkyl esters, ethylhexyl benzoate, phenethyl benzoate;

[0114] - Dicarboxylic acid esters with straight-chain or branched-chain alcohols, such as dibutyl adipate, dioctyl carbonate, and diisopropyl sebacate;

[0115] 1-hydroxycarboxylic acid esters with straight-chain or branched fatty alcohols;

[0116] - Esters of straight-chain or branched fatty acids with polyols, such as butanediol dioctanoate / didecanoate;

[0117] -Based on C6-C 18 Fatty acid monoglycerides, diglycerides, and triglycerides, such as caprylic / capric triglyceride and coco glyceride;

[0118] -Gerbert alcohols, such as octyldodecynol;

[0119] - Hydrocarbons, such as hydrogenated polyisobutylene, mineral oil, squalene, and isohexadecane;

[0120] -Ethers, such as dioctyl ether;

[0121] - Silicone derivatives (organically modified polysiloxanes), such as dimethyl polysiloxane and cyclic silicones.

[0122] Preferred thickeners include

[0123] - Fatty alcohols, such as cetyl alcohol, cetearyl alcohol, and stearyl alcohol;

[0124] - Fatty acids, such as stearic acid;

[0125] - Fatty acid esters, such as myristyl stearate;

[0126] - Waxes, such as beeswax, carnauba wax, microcrystalline wax, ceresin, and ozocerite;

[0127] - Silicate derivatives, such as magnesium silicate;

[0128] - Cellulose derivatives, such as hydroxypropyl cellulose.

[0129] Preferred sensory enhancers include

[0130] -Silicon dioxide;

[0131] -Mica;

[0132] - Polymethylsilsesquioxane;

[0133] - Starch derivatives, such as aluminum octenyl succinate;

[0134] -Dimethylpolysiloxane derivatives;

[0135] - Boron nitride;

[0136] -HDI / trimethylolhexyl lactone crosslinked polymer.

[0137] - Perlite

[0138] Preferred moisturizers include

[0139] -1,2-pentanediol;

[0140] -1,2-hexanediol;

[0141] -1,2-octanediol;

[0142] -1,2-decanediol;

[0143] -2-Methyl-1,3-propanediol.

[0144] Preferred adjuvants include

[0145] -Tocopherol derivatives;

[0146] -Retinol derivatives;

[0147] -Ascorbic acid derivatives;

[0148] -Biospermyl alcohol;

[0149] -Allantoin;

[0150] -Panthenol;

[0151] - Chelating agents (EDTA, EDDS, EGTA, phytic acid, piroctone olamine);

[0152] -Ethylhexylglycerol;

[0153] -Hydroxyacetophenone;

[0154] - Caprylhydroxymic acid;

[0155] - Propellants, such as propane, butane, isobutylene, and dimethyl ether;

[0156] - Insect repellents, such as butyl acetyl aminopropionate.

[0157] Preferred preservatives include

[0158] -Benzyl alcohol;

[0159] - Gingerone.

[0160] Preferred fragrances are selected from the group consisting of: limonene, citral, linalool, α-isomethylionone, geraniol, citronellol, 2-isobutyl-4-hydroxy-4-methyltetrahydropyran, 2-tert-butyl-pentylcyclohexyl acetate, 3-methyl-5-phenyl-1-pentanol, 7-acetyl-1,1,3,4,4,6-hexamethyltetrahydronaphthalene, adipate, α-pentylcinnamaldehyde, α-methylionone lanone, pentyl-C-butylphenylmethylpropionaldehyde, cinnamaldehyde, amyl salicylate, pentylcinnamyl alcohol, anisole, benzoin, benzyl alcohol, benzyl benzoate, benzyl cinnamate, benzyl salicylate, bergamot oil, bitter orange oil, butylphenylmethylpropanol, cardamom oil, cedrol, cinnamaldehyde, cinnamyl alcohol, citronellol crotonate, lemon oil, coumarin, diethyl succinate, ethyl linalool, eugenol, evern extracts of *Furfuracea*, extracts of *Evernia prunastri*, farnesol, guaiac oil, hexylcinnamaldehyde, hexyl salicylate, hydroxycitronellol, lavender oil, lemon oil, linaylacetate, citrus oil, peppermint PCA, methyl heptenone, nutmeg oil, rosemary oil, sweet orange oil, terpineol, coumarin oil, triethyl citrate, vanillin, and combinations thereof.

[0161] Preferably, the cosmetic composition of the present invention comprises two or more of the above-described additives. In conjunction with the above preferred embodiments, it should be understood that if the cosmetic composition comprises two or more additives, then any combination of additives as defined above is also part of the present invention.

[0162] Based on the above preferred and particularly preferred embodiments, it should be understood that the cosmetic composition may further contain water.

[0163] When water is present in a cosmetic composition, it should be understood that it is preferably present in an amount greater than 5% by weight based on the total weight of the composition. Furthermore, it should be understood that when water is present in a cosmetic composition, the cosmetic composition can be an oil-in-water emulsion (O / W emulsion), an oil-in-water emulsion (W / O emulsion), a gel cream, or an oil-in-gel.

[0164] In one embodiment of the invention, the cosmetic composition may be provided in different forms, such as gel, cream, oil, emulsion, stick, or as a sprayable product.

[0165] According to a particularly preferred embodiment, the cosmetic composition of the present invention is free of microplastics. According to another particularly preferred embodiment, the cosmetic composition of the present invention is free of synthetic thickeners. More preferably, the cosmetic composition of the present invention is free of both microplastics and synthetic thickeners. The term "free of" herein means that the cosmetic composition contains less than 0.1 wt.%, preferably less than 0.001 wt.%, and most preferably less than 0.0001 wt.%, of either microplastics or synthetic thickeners, each based on the total weight of the cosmetic composition.

[0166] The cosmetic composition of the present invention comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition. According to preferred embodiments, the cosmetic composition comprises less than 0.01 wt.%, more preferably less than 0.001 wt.%, and most preferably less than 0.0001 wt.%, of a synthetic polymer material, each based on the total weight of the cosmetic composition. The composition comprising less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition includes embodiments where the composition does not contain synthetic polymer material. In fact, it is particularly preferred that the cosmetic composition does not contain synthetic polymer material. The term synthetic polymer material includes synthetic thickeners, microplastics, and other synthetic polymers.

[0167] According to a preferred embodiment of the present invention, the cosmetic composition is free of VP / eicosene copolymer, i.e., contains less than 0.0001 wt.% of VP / eicosene copolymer based on the total weight of the cosmetic composition.

[0168] According to another preferred embodiment of the invention, the cosmetic composition is free of VP / hexadecene copolymer, i.e., contains less than 0.0001 wt.% of VP / hexadecene copolymer based on the total weight of the cosmetic composition.

[0169] According to another preferred embodiment of the invention, the cosmetic composition is free of triacontyl PVP, i.e. contains less than 0.0001 wt.% triacontyl PVP based on the total weight of the cosmetic composition.

[0170] The cosmetic compositions of the present invention comprise at least one organic or inorganic UV filter. In this context, it is further preferred that the cosmetic compositions have an SPF (Sun Protection Factor) value of at least 6 to 50+ (according to EC recommendations). SPF can be determined, exemplarily, through simulation calculations using the BASF sunscreen simulator (https: / / sunscreensimulator.basf.com / ) or in vivo or in vitro. Suitable in vitro methods can be performed as follows:

[0171] In vitro SPF determination was based on the evaluation of the UV transmittance of a film of sunscreen sample spread on a rough substrate – SB6 PMMA plate (4-5 μm roughness, area 4.8 x 4.8 cm) from Creil Helioscreen, France. The sunscreen formulation to be tested was applied to the PMMA plate at an amount of 1.2 mg / cm². 2 Each preparation was prepared on three plates, with five measurements per plate. The preparation was manually dispensed as evenly as possible onto the plates. Before measurement, the plates with the preparation applied were stored at room temperature and in the dark for 30 minutes.

[0172] In vitro transmittance measurements were performed from 290–400 nm using a Labsphere UV Transmittance Analyzer UV 2000S in 1 nm increments. UV transmittance spectra were acquired, and in vitro SPF values ​​(average SPF of all 15 values ​​from three plates, with 5 measurements per plate) were calculated according to the following equation.

[0173]

[0174] Where ser(λ) is the erythema spectrum, S(λ) is the spectral irradiance received from the UV source, and T(λ) is the transmittance measured in vitro.

[0175] This invention also relates to the use of a combination of rice starch (INCI rice starch) and at least one natural organic thickener for stabilizing cosmetic compositions, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter. As discussed with respect to the compositions of this invention, the combination of rice starch (INCI rice starch) and a natural organic thickener provides a stable, storable cosmetic composition without the need for any synthetic thickener.

[0176] The disclosure of the cosmetic compositions of the present invention, with appropriate modifications, also applies to the use of a combination of rice starch (INCI rice starch) and at least one natural organic thickener for stabilizing cosmetic compositions.

[0177] This invention also relates to the use of rice starch (INCI rice starch) and at least one natural organic thickener for increasing the viscosity of a cosmetic composition, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter. The use of rice starch (INCI rice starch) and at least one natural organic thickener results in an increased viscosity of the cosmetic composition compared to a cosmetic composition without the combination of rice starch (INCI rice starch) and at least one natural organic thickener.

[0178] The disclosure of the cosmetic compositions of the present invention, with appropriate modifications, also applies to the use of a combination of rice starch (INCI rice starch) and at least one natural organic thickener to increase the viscosity of the cosmetic composition.

[0179] Furthermore, the present invention relates to a method for preparing the cosmetic composition of the present invention, the method being carried out by providing rice starch (INCI rice starch), at least one natural organic thickener and other ingredients for the cosmetic composition, mixing the rice starch (INCI rice starch), at least one natural organic thickener and other ingredients to obtain the cosmetic composition, wherein the cosmetic composition contains less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition contains at least one organic or inorganic UV filter.

[0180] The invention is further illustrated by the following examples.

[0181] Example

[0182] Compositions comprising the rice starch of the present invention and at least one natural organic thickener were prepared as follows, along with comparative examples:

[0183] First, prepare parts A and B separately, and then heat each separately to 80°C with stirring. With increased stirring, incorporate part A into part B and homogenize using Ultra Turrax. Then, cool the mixture to room temperature (25°C) while stirring. Next, add part C to the mixture and stir to combine. Finally, add part D and stir the resulting final mixture at room temperature for another 30 minutes. Adjust the pH of the mixture to between 6.0 and 7.0 using citric acid.

[0184] Cosmetic compositions as shown in Table 1 were obtained. The cosmetic compositions according to the invention comprise rice starch and 0.30 wt.% of natural organic thickeners, namely tara gum, alginate, and xanthan gum (Examples 1-3 of the invention). Comparative cosmetic compositions do not contain rice starch (Comparative Examples 1-3) or do not contain natural organic thickeners (Comparative Example 4).

[0185]

[0186]

[0187] Table 1: Cosmetic compositions according to the present invention and comparative examples; DHHB = hexyl diethylaminohydroxybenzoylbenzoate; EHT = ethylhexyl triazine; BEMT = bis-ethylhexyloxyphenol methoxyphenyl triazine; all values ​​are in wt.% and are based on the total weight of the cosmetic composition.

[0188] Formulations containing alginate require the addition of divalent cations, in this case calcium chloride dihydrate, to activate gel formation by creating a so-called "eggbox" structure.

[0189] Each formulation was filled into 250 mL glass vials, and the viscosity of the different compositions of Examples 1-3 and Comparative Examples 1-4 was determined using Brookfield DVIII 24 hours after manufacture. Furthermore, the stability of the different compositions was evaluated by visual testing at room temperature after different time periods (24 hours, 1 month, 2 months, and 3 months). Table 2 shows the results of the viscosity measurements and macroscopic stability evaluation.

[0190]

[0191] Table 2: Viscosity and stability data for different compositions; n / a: Not applicable, formulation is unstable.

[0192] The data in Table 2 show that the compositions of the present invention exhibit significantly higher viscosity than the comparative compositions. Rice starch alone does not provide sufficient thickening capacity to achieve an acceptable viscosity for the topical cosmetic composition (viscosity ηη = 112 mPa·s in Comparative Example 4). Furthermore, the formulation showed phase separation within 2 months. Interestingly, the addition of rice starch to compositions containing a natural organic thickener increased the viscosity of all compositions studied by more than 2.5 times. The compositions of the present invention containing both rice starch and a natural organic thickener exhibited excellent stability after one and three months without any phase separation. In contrast, the comparative examples (Comparative Examples 1-3) without rice starch showed phase separation and / or suboptimal viscosity characteristics after a certain period of storage.

[0193] Both the composition of Comparative Example 3, containing xanthan gum as a natural organic thickener, and the composition of Example 3 of the present invention remained stable after a 3-month storage period, although the viscosity of the composition of the present invention was almost three times that of the comparative composition. To simulate the effects of a longer storage period, accelerated stability tests were performed on the compositions of Comparative Example 3 and Example 3 of the present invention. Centrifugation was used as the accelerated stability test. For this purpose, 15 g of each formulation was transferred to a centrifuge tube. Centrifugation conditions were 5000 rpm for 10 minutes. The centrifuge used for the stability test was a Multifuge X1R from Heraeus. After the centrifugation step, phase separation of the two samples was analyzed. In the case of Example 3 of the present invention, the formulation remained completely homogeneous even after centrifugation. In contrast, for the formulation of Comparative Example 3, clearly visible phase separation was observed in the centrifuge tube after centrifugation. Therefore, when accelerated stability tests were performed by centrifugation, a significant difference in stability between the formulation of Example 3 of the present invention and Comparative Example 3 was also observed.

[0194] These examples demonstrate that cosmetic compositions containing rice starch and at least one natural organic thickener exhibit excellent viscosity and stability properties.

Claims

1. A cosmetic composition comprising - Rice starch (INCI rice starch) and - At least one natural organic thickener, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter.

2. The cosmetic composition according to claim 1, characterized in that, This natural organic thickener is selected from the group consisting of polysaccharides, polypeptides, proteins, and mixtures thereof.

3. The cosmetic composition according to claim 2, characterized in that, This natural organic thickener is a polysaccharide selected from the group consisting of: natural gums, pectin, cellulose, chitin, guaiac glucan, and mixtures thereof.

4. The cosmetic composition according to claim 3, characterized in that, This natural organic thickener is a natural gum selected from the group consisting of: agar, alginate / sodium alginate (algin), carrageenan, gum arabic, solanum, tragacanth, carrageenan, locust bean gum, beta-glucan, dammar gum, glucomannan, psyllium husk, tara gum (gum), gellan gum, xanthan gum, and mixtures thereof, especially alginate / sodium alginate (algin), xanthan gum, and tara gum (gum).

5. The cosmetic composition according to any one of the preceding claims, characterized in that, The rice starch (INCI rice starch) granules have a polygonal granule shape.

6. The cosmetic composition according to any one of the preceding claims, characterized in that, The rice starch (INCI rice starch) has a particle size distribution Dv50 of 2.0 to 10.0 μm, particularly 6.0 to 8.0 μm, as determined by static laser scattering, and / or the rice starch (INCI rice starch) has an oil absorption capacity of 0.5 to 1.0 g, particularly 0.7 to 0.8 g oil / 1.0 g starch.

7. The cosmetic composition according to any one of the preceding claims, characterized in that, This cosmetic composition is free of microplastics and / or synthetic thickeners.

8. The cosmetic composition according to any one of the preceding claims, characterized in that, The amount of rice starch (INCI rice starch) in the cosmetic composition is 0.6 to 10.0 wt.%, particularly 1.0 to 8.0 wt.%, 1.5 to 6.0 wt.%, or 1.5 to 4.0 wt.%, each based on the total weight of the cosmetic composition, and / or the amount of the natural organic thickener is at least 0.05 wt.%, particularly 0.05 to 5.0 wt.%, 0.08 to 3.0 wt.%, 0.1 to 2.0 wt.%, 0.15 to 1.0 wt.%, or 0.2 to 0.5 wt.%, each based on the total weight of the cosmetic composition.

9. The cosmetic composition according to any one of the preceding claims, characterized in that, This cosmetic composition does not contain starch that is not rice starch (INCI rice starch).

10. The cosmetic composition according to any one of the preceding claims, characterized in that, The at least one organic or inorganic UV filter is selected from the group consisting of: -4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI Butylmethoxydibenzoylmethane) -2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI diethylaminohydroxybenzoyl hexyl benzoate), -2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexyloxyphenylmethoxyphenyltriazine), 2-Phenylacetic-1H-benzimidazole-5-sulfonic acid (INCI phenylbenzimidazole sulfonic acid), -Tri-biphenyltriazine, -1,1'-(1,4-piperazindiyl)bis[1-[2-[4-(diethylamino)-2-hydroxybenzoyl]phenyl]-methyl ketone (INCI bis-(diethylaminohydroxybenzoylbenzoyl)piperazine), -Phenylidene bis-diphenyltriazine, -2,2'-Methylenebis[6-(2H-1,2,3-benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol](INCI methylenebis-benzotriazolyltetramethylbutylphenol), -[(3Z)-3-[[4-[(Z)-[7,7-dimethyl-2-oxo-1-(sulfonylmethyl)-3-bicyclo[2.2.1]heptyl]methyl]phenyl]methylene]-7,7-dimethyl-2-oxo-1-bicyclo[2.2.1]heptyl]methanesulfonic acid (INCI terephthalimide dicamphor sulfonic acid), Sodium phenyldibenzimidazole tetrasulfonate -4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone), -(RS)-2-ethylhexyl-2-hydroxybenzoate (INCI ethylhexyl salicylate), - Diethyl polydimethylsiloxane benzylmalonate (INCI polysiloxane-15) -Diethylhexylbutamidotriazinone -2-ethoxyethyl (2Z)-2-cyano-2-[3-(3-methoxypropylamino)cyclohexyl-2-en-1-yl]acetate (INCI methoxypropylaminocyclohexeneylethoxyethyl cyanoacetate), -2-(2H-benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]-1-disiloxyl]propyl]phenol (INCI cresoltrazol trisiloxane), -Titanium dioxide, - Zinc oxide, - Cerium oxide and its mixtures.

11. The cosmetic composition according to claim 10, characterized in that, The at least one organic or inorganic UV filter is an organic UV filter selected from the group consisting of: 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (INCI diethylaminohydroxybenzoylhexyl benzoate), butyl methoxydibenzoylmethane, 2,4-bis-{[4-(2-ethyl-hexoxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI bis-ethylhexoxyphenylmethoxyphenyltriazine), 4,4',4”-(1,3,5-triazine-2,4,6-triyltriimino)tri-benzoic acid-tris(2-ethylhexyl) ester (INCI ethylhexyltriazinone), and mixtures thereof.

12. The cosmetic composition according to any one of the preceding claims, characterized in that, This cosmetic composition is free of all of the following UV filters: 2-cyano-3,3-diphenyl-2-acrylate 2-ethylhexyl ester (INCI Octocrylene), (RS)-2-ethylhexyl-(2E)-3-(4-methoxyphenyl)prop-2-enoate (INCI Ethylhexyl Methoxycinnamate), and 3,3,5-trimethylcyclohexyl salicylate (INCI Homosalate).

13. Use of rice starch (INCI rice starch) and at least one natural organic thickener for stabilizing a cosmetic composition, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter.

14. Use of rice starch (INCI rice starch) and at least one natural organic thickener for increasing the viscosity of a cosmetic composition, wherein the cosmetic composition comprises less than 0.1 wt.% of a synthetic polymer material based on the total weight of the cosmetic composition, and wherein the cosmetic composition comprises at least one organic or inorganic UV filter.

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