Surface-treated hydrophobic cellulose

Abstract

The present invention provides a cosmetic powder suitable for use in cosmetic compositions, which is environmentally friendly and has been surface-treated to improve its dispersibility and stability in the composition. [Solution] A hydrophobic cellulose powder is provided, comprising (a) about 75% to about 99.5% by weight of cellulose powder particles, and (b) about 0.5% to about 25% by weight of a surface treatment agent selected from modified dextrin or modified amino acids, wherein the hydrophobic cellulose powder has relatively low solubility in aqueous media, and when dispersed in an emulsion, it can provide an emulsion that is stable for more than 4 weeks.

Description

[Technical Field]

[0001] This disclosure generally relates to cosmetic powder materials formed from cellulose. These cosmetic powder materials become hydrophobic and usable in cosmetic formulations by surface treatment with at least dextrin or modified amino acids. This disclosure relates to surface-treated cellulose, methods for producing cellulose powder surface-treated with at least one dextrin and / or modified amino acid, and cosmetic formulations containing surface-treated cellulose and their use. Such cosmetic powders exhibit improved stability and emulsification stability. [Background technology]

[0002] The information described below should not be considered prior art of this disclosure, and its sole purpose is to help provide a more complete understanding of the embodiments.

[0003] Traditionally, large quantities of various powders have been used in the manufacture of products distributed and sold by the hygiene products industry, such as cosmetics, skincare products, and toiletries. These powders exist in dispersed forms in various product configurations, including aqueous solutions, water gels, and w / o and o / w emulsion formulations. However, they often suffer from poor dispersibility and product stability, leading to the formation of aggregates, clumps, and flocculation. These results are thought to be due to the physical properties of the powders, such as particle size, surface activity, charge, polarity, and specific gravity.

[0004] Untreated powders tend to aggregate due to several surface properties (surface charge, surface polarity, etc.). To solve this problem and improve the dispersibility and stability of powders, surface treatments using various treatment agents have been proposed. There are various agents and methods for surface treating powders, depending on the purpose of the treatment. The treatment agent may be selected considering the properties of the surface to be treated and its interaction with the dispersion medium. For example, known methods include lipophilization with oil or metal soap, hydrophilization with surfactant or silica, and hydrophobicization with silicone oil.

[0005] While there are many types of lipid-soluble treatments, there are relatively few known conventional technologies known as hydrophilization treatments, such as silica treatment. Currently known hydrophilization treatments are not perfect. For example, in compositions containing hydrophilized powder, the treatment agent may separate from the powder, causing powder aggregation. As a result, spots may appear, or the finished color may differ from the desired coating color. Furthermore, redispersibility may deteriorate. This can cause problems in use and potentially lead to issues with product stability. In addition, some known surfactants used in water-based systems can cause skin irritation, which is a problem in hygiene products.

[0006] In recent years, powder development has focused on providing smoother, longer-lasting cosmetics. To achieve these desirable properties, the primary focus has been on improving the hydrophobicity of surface treatments for powders and pigments, and the dispersibility of surface-treated powders in the oil phase. However, when powders are used in cosmetic systems such as foundations, lipsticks, lotions, or creams, they generally need to be dispersed in the aqueous phase. This is because most cosmetic powders are hydrophilic. Multiple emulsifiers are often used to disperse non-hydrophobic powders in the aqueous phase. Without such emulsifiers, dispersion in aqueous systems is often difficult. However, the use of emulsifiers has the drawback of resulting in a sticky or heavy feel in the composition.

[0007] The affinity of a powder is determined by its surface properties, particularly particle size (especially in the case of nano- and micro-sized powders) and aspect ratio. Powders that remain on substrates commonly used in consumer products applied to skin and hair have a high affinity, often requiring additional washing steps or the use of specialized cleaning agents for complete removal. It is also known that when inorganic and organic cosmetic powders come into direct contact with the skin, they can absorb moisture from the skin's surface, potentially altering the skin's natural balance between hydrophilicity and lipid solubility. This can result in a localized dehydration effect, potentially causing discomfort to users of these products. Therefore, cosmetic powders are typically treated to improve dispersibility, homogeneity, and stability, and to mitigate the adverse effects that can occur from direct contact with the skin.

[0008] Various surface treatment methods have been proposed. One method involves dissolving a silicone oil (e.g., methylpolysiloxane, methylhydrogenpolysiloxane, alkylsilane with 10 or fewer carbon atoms in the alkyl portion) in a solvent as a surface treatment agent, adding and mixing it with the powder, and then heating it after a drying process to bake the surface treatment onto the powder. Another method involves dispersing the powder and octyltriethoxysilane, etc., in an organic solvent using a media grinder, and then treating the surface of the powder with an organosilicon compound such as octyltriethoxysilane (Japanese Patent Publication No. Hei 8-104606). There is also a method in which N-octyltrimethoxysilane or N-octyltriethoxysilane is stirred and mixed with the powder using a Henschel mixer, reacted with the powder while heated, and the resulting treated powder is pulverized with a hammer mill (Japanese Patent Publication No. 2001-181136). Another method involves dispersing a silicone compound such as methylhydrogenpolysiloxane in water to create an emulsifier, and then mixing this emulsion with the powder to coat the surface of the powder particles (Japanese Patent Publication No. 9-268271).

[0009] Japanese Patent Publication No. 6-59397 discloses a jet method in which a metal soap, an organosilicon compound in which reactive groups such as hydrogen groups are bonded to silicon atoms, and a powder are mixed, and then the mixture is ground using a pulverizer with a jet stream while simultaneously performing surface treatment. Japanese Patent Application Publication No. 2002-80748 discloses a method for coating surface treatment agents for layers A and B using a jet method to improve the dispersibility of powder. Another method involves mixing a silica compound with water, ethanol, and an aqueous solution of ammonium hydroxide, and dispersing titania powder to prepare premix 1. Separately, tetraethoxysilane, water, and ethanol are mixed to prepare premix 2. Premix 2 was added to premix 1 at a constant speed over 2 hours while stirring with a magnetic stirrer. The resulting mixture was aged for 12 hours. Coating formation and aging were carried out at 25°C. After that, the solution was filtered by suction, and the filtrate was dried with hot air at 50°C for 12 hours to prepare silica coated powder. This process is disclosed in U.S. Patent No. 6,534,044, and all disclosures of that patent are incorporated herein by reference.

[0010] U.S. Patent No. 5,496,544, whose entire disclosure is incorporated herein by reference, discloses a cosmetic composition for skin comprising an anhydrous powder including a solid powder phase mixed with a fatty binder containing a silicone mixture. The silicone mixture comprises at least one silicone oil, at least one silicone wax, at least one silicone resin, and optionally at least one silicone rubber, and optionally at least one phenyl dimethicone. However, according to U.S. Patent No. 5,496,544, the anhydrous powder is physically treated with the fatty binder. Therefore, the cosmetic composition of U.S. Patent No. 5,496,544 has the disadvantage that the fatty binder can be easily extracted from the powder phase because there is no covalent bond between the powder phase and the fatty binder. In addition, in the cosmetic composition of U.S. Patent No. 5,496,544, the coating of the powder phase consists of a complex mixture of multiple types of silicones, thus providing different types of sensations to the skin.

[0011] EP1116753 describes powders treated with reactive silicone, including powders surface-coated with a silicone compound. The amount of hydrogen generated from the Si-H groups remaining on the surface of the silicone-treated powder is less than 0.2 ml / g of the treated powder, and the contact angle between water and the treated powder is at least 100°. However, the direct reaction between the reactive Si-H bond-containing methylhydrogen polysiloxane and the powder surface described in EP1116753 is incomplete and has the drawback of releasing H2 over time, which is the cause of the resulting cosmetic powder's shortcomings. In fact, the generation of H2 can cause the container holding the powder to expand and deteriorate, while the powder itself may harden and crack.

[0012] U.S. Patent No. 6,482,441, whose disclosure is entirely incorporated herein by reference, discloses a powder coated with layers A and B. Layer A comprises organopolysiloxane, polyolefin, hydrogenated lecithin, N-acyl amino acids, and dextrin fatty acid esters, while layer B comprises organopolysiloxane with a single functional group modified at one end, alkylsilane with a single functional group modified at one end, and branched fatty acids. The coated powder is said to be ultradispersible. Surface treatment with N-acyl amino acids has been proposed, for example, in Japanese Patent Publication Nos. 61-737775, 61-69709, 3-200879, 5-186706, 9-328413, and 10-226626. Furthermore, Japanese Patent Publication No. 60-69011 proposes a method of coating with fatty acids, while Japanese Patent Publication No. 60-184571 and Japanese Patent Publication No. 60-190705 propose a method of surface treatment with hydrogenated lecithin.

[0013] Cellulose, being a plant-derived product, is an environmentally friendly material, in contrast to many cosmetic powders made from non-biodegradable polymers and inorganic materials. However, while cellulose is more hydrophilic than most cosmetic powders, it is less reactive, making it difficult to apply hydrophobic surface treatments to cellulose.

[0014] It is desirable to provide a cosmetic powder suitable for use in cosmetic compositions, environmentally friendly, and surface-treated to improve dispersibility and stability in the composition. Other features and advantages will become apparent from the following disclosure. Although certain issues and drawbacks relating to the state of the art have been described, the embodiments described herein should not be construed as excluding some or all of the features described above. In fact, aspects of the embodiments may include features known in the art without suffering prior art defects. [Overview of the project] [Means for solving the problem]

[0015] The embodiments described herein relate to surface-treated cellulose powders and salt forms thereof, which are surface-treated with at least modified dextrin and / or modified amino acids. According to one embodiment, at least one cosmetic powder is provided, the surface of which is chemically modified with at least one polysaccharide or a mixture thereof and a salt form thereof, the polysaccharide being chemically immobilized on the surface.

[0016] Another embodiment relates to a method for producing surface-treated cellulose powder, comprising the steps of: (a) preparing a mixture of modified dextrin and / or modified amino acids and at least one cellulose powder; (b) optionally heating the mixture; (c) stirring the mixture to uniformly disperse the cellulose powder and modified dextrin and / or modified amino acids to form a surface-treated cellulose mixture; (d) heating the surface-treated cellulose mixture during or after stirring in step (c); and (e) drying the surface-treated cellulose mixture to remove water and optionally a solvent to form surface-treated cellulose powder.

[0017] Another embodiment provides a cosmetic formulation comprising (a) at least one surface-treated cellulose powder whose surface is treated with modified dextrin and / or modified amino acids, and (b) a carrier that can be used as a cosmetic.

[0018] The following describes particularly preferred embodiments for illustrative purposes only, but other aspects and advantages of the embodiments will be readily apparent to those skilled in the art by referring to the following detailed description. It should be understood that the preferred embodiments include other different embodiments and that various changes are possible in some details. Therefore, the following description should be considered essentially illustrative and not limiting of the invention.

Brief Description of the Drawings

[0019] The embodiments can be understood based on the following detailed description by referring to the accompanying drawings. The drawings include the following figures.

[0020] [Figure 1] Photographs of cellulose powder samples treated with various surface treatment agents A - G in an aqueous solution. Surface treatments A and B are more hydrophobic than C - G.

[0021] [Figure 2] Photograph showing a 250 - fold magnification of an emulsion prepared using cellulose powder treated with surface treatment agent A, showing the state under various treatment conditions and indicating the stability of the emulsion.

[0022] [Figure 3] Photograph showing a 250 - fold magnification of an emulsion prepared using cellulose powder treated with surface treatment agent B, showing the state under various treatment conditions and indicating the stability of the emulsion.

[0023] However, note that the accompanying drawings only show general embodiments of the invention and are not considered to limit the scope of the invention, and may include other embodiments with similar effects.

Modes for Carrying Out the Invention

[0024] With reference to the figures, selected embodiments and preferred modes for carrying out the present invention will be described. It should be understood that these embodiments are not limited to those depicted in the figures.

[0025] The following definitions and non-limiting guidelines are provided to facilitate understanding of the detailed descriptions herein. The headings and subheadings used herein (such as “Background Art” and “Summary of the Invention”) are intended solely to organize the disclosure of embodiments in a conventional manner and are not intended to limit this disclosure. For example, the subject matter disclosed in the “Background Art” paragraph may include aspects of the technology that fall within the scope of the embodiments and may not constitute prior art. The subject matter disclosed in “Summary of the Invention” does not encompass the entire scope of the embodiments, nor does it disclose them completely. For convenience, materials are classified or described in parts of this specification as having a particular utility (for example, as an “active” component or a “carrier” component), and it should not be construed that such materials, when used in any given composition, must necessarily or alone function according to the classification herein.

[0026] The references cited herein do not constitute prior art or any indication that they are relevant to the patentability of the embodiments disclosed herein. Consideration of the content of references cited in the "Background Art" section is intended merely to provide an overview of the claims made by the authors of those references, and does not constitute an assertion that the content of those references is accurate.

[0027] The descriptions and specific examples illustrate embodiments, but are for illustrative purposes only and are not intended to limit the invention. Furthermore, while multiple embodiments having the described features are described, they are not intended to exclude other embodiments having additional features or incorporating different combinations of the described features. The examples are provided for illustrative purposes to illustrate methods of use and production of the methods and compositions described herein and are not intended to indicate that the production or testing of a given embodiment has not actually been performed or carried out unless expressly stated otherwise.

[0028] As used herein, the terms “preferred” and “preferred” refer to embodiments that provide particular advantages under specific circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, while one or more preferred embodiments are described, this does not mean that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope. In addition, the compositions and methods described herein may include, substantially consist of, or comprise the elements described herein.

[0029] Throughout this specification, the term “range” is used as a shorthand expression to describe all the values ​​included within that range. Any value within the range can be selected as the end of that range. Furthermore, all references made herein are incorporated herein by reference in their entirety. In the event of any conflict between the definitions in this disclosure and the definitions in the references, this disclosure shall prevail.

[0030] Throughout this specification, where the terms “about” or “approximately” are used, the numerical value is intended to be an approximation. This includes the numerical value modified by “about” or “approximately,” and includes reasonable errors, including standard measurement errors. Unless otherwise specified, all percentages and quantities referred to herein should be understood to refer to weight percentages. When “quantity” is referred to, it is the quantity based on the effective weight of the material. Where a specific value is given herein, it is intended that the value be increased or decreased to account for measurement errors. For example, a quantity of 10% or about 10% may include 9.5% or 10.5% when considering measurement errors that a person skilled in the art would understand.

[0031] As used herein, the term “cosmetic composition” means a composition intended to be applied to a consumer’s skin, particularly the skin of the face, or areas of body skin, or hair, in order to modulate the condition of the skin and / or to improve the appearance of the skin and hair. The term “powder” refers to any material used in cosmetics and the like with a particle size in the range of approximately 0.01 micrometers to 1000 micrometers. “Mean primary particle size” for polysaccharide-treated powders refers to the equivalent volume mean primary particle size of untreated polysaccharide-treated powder. The mean primary particle size is measured before treatment for polysaccharide-treated powders.

[0032] All percentages, ratios, and proportions mentioned herein are by weight unless otherwise specified. All weights for listed ingredients are based on the amount of active ingredient unless otherwise specified.

[0033] The embodiments described herein include one or more cellulose powders treated with at least one dextrin and / or modified amino acid, which obtain sufficient hydrophobicity through surface modification and can be used in many industries. The cellulose powder is cellulose (C) represented by the following formula. 12 H 20 O 10 ) Includes n. [ka] n represents the number of repeating units, which generally varies depending on the origin of the cellulosic material, and expresses the degree of polymerization (DP). Cellulose is a linear glucose homopolymer in which glucopyranose units are linked by β-1,4-glycosidic bonds. Cellulose powder is usually produced by mechanically defibrating α-cellulose, which is typically obtained as pulp from plant materials.

[0034] Cellulose powder is hydrophilic but insoluble in water. It has many applications, including use in pharmaceuticals (in solid formulations such as tablets) due to its excellent compressibility, as well as in processed foods and cosmetics as an anti-caking agent, stabilizer, texture modifier, or suspension agent. Because of its properties such as thickening, emulsification stability, water retention, oil absorption, and shape retention, cellulose powder is used as a food additive, tablet excipient, dispersant, shape retainer, water-retaining agent, and filter aid. It is used as a filler and as an additive in paints and adhesives in a wide range of fields, including food, pharmaceuticals, cosmetics, building materials, ceramics, rubber, and plastics.

[0035] The particle size of cellulose powder can range from 10 to 500 μm, or about 25 to 400 μm, or about 30 to 300 μm, or about 50 to 250 μm, or any value in between. Cellulose powder is commercially available from various suppliers, with average particle sizes ranging from about 50 μm, 75 μm, 100 μm, and 250 μm. In some embodiments, useful cellulose powders have an average degree of polymerization of 100 to 1,000, a weight-average particle size greater than 30 μm and less than 250 μm, and an apparent specific volume of 2 to 15 cm³. 3 Less than / g, defined as the total organic carbon content (%) during 1% NaOH extraction relative to the total organic carbon content (%) during pure water extraction, means that the organic carbon content from residual impurities is higher than 0.07 and 0.3% or less.

[0036] Although cellulose is hydrophilic, in some applications it is desirable to apply a hydrophobic surface treatment to cellulose powder materials. The inventors unexpectedly discovered that many agents known to be effective for hydrophobic surface treatment are not effective on cellulose powder materials. For example, fatty acid esters (e.g., hydrogenated olive oil stearyl ester), silicone-based materials (e.g., dimethicone), disodium stearoyl glutamate, lecithin, isostearic acid, and other fatty acids were not effective in hydrophobizing the surface of cellulose powder materials. The inventors' discovery was quite unexpected, but modified dextrin compounds and / or modified amino acids (excluding disodium stearoyl glutamate, which is excluded here) can be used to hydrophobize the surface of cellulose powder materials and to utilize modified cellulose powder to form a stable emulsion.

[0037] In some embodiments, modified dextrin can be used as a surface treatment agent for cellulose powder materials. Dextrin is a low molecular weight carbohydrate containing a mixture of D-glucose units linked by glycosidic bonds. Dextrins include a variety of products produced by heating starch with small amounts of water and acid. Examples of dextrins include yellow dextrin, canary dextrin, white dextrin, British gum, amylodextrin, erythrodextrin, and acrodextrin. Typically, the molecular formula is (C6H 10 In 05)n, n is an integer representing the number of glucose molecules in the chain, which determines the length and molecular weight of a particular dextrin. n is typically in the range of 2 to 15, or 3 to 9. The chemical formula for dextrin is as follows: [ka]

[0038] Modified dextrin can be used in embodiments as long as it can treat the surface of the cellulose powder material to improve hydrophobicity. In one embodiment, the modified dextrin is a dextrin ester. Specifically, the modification of dextrin includes modification with at least one, preferably C8-C 24 and more preferably C8-C 20 fatty acid ester, and even more preferably C 12 C 14 or C 16 fatty acid ester modification. The dextrin ester may be selected from dextrin myristate and / or dextrin palmitate, or a mixture thereof. Dextrin palmitate may utilize, for example, those sold under the names of Leopal TL(R) and Leopal KL(R) by Chiba Flour Milling Co., Ltd.

[0039] The cellulose powder may be surface-treated with a modified amino acid to hydrophobize in addition to or instead of the modified dextrin. In one embodiment, the modified amino acid is an acyl amino acid in which a fatty acid is conjugated or amidated to the amino acid. Suitable amino acids or amino acid salts are known α-amino acids that can be acylated with fatty acid halides to form N-acyl amino acids. Suitable amino acids include, for example, glutamic acid, sarcosine, aspartic acid, alanine, valine, leucine, isoleucine, lysine, proline, hydroxyproline, glycine, serine, cysteine, cystine, threonine, histidine and their salts. More specifically, glutamic acid, sarcosine, aspartic acid, glycine, lysine and their salts are included. Glutamic acid, aspartic acid, glycine, lysine are particularly preferred. Amino acids can be used in optically pure form or as a racemic mixture.

[0040] The acyl amino acid can be modified with any fatty acid and includes at least one fatty acid, preferably C8-C 24 and more preferably C8-C 20 fatty acid, and even more preferably C12 , C 14 , or C 16 It is modified by fatty acids. In one embodiment, the modified amino acid is a stearoyl amino acid, or stearoyl glutamic acid, stearoyl aspartic acid, stearoyl lysine, stearoyl glycine, or a mixture thereof. In another embodiment, the modified amino acid is stearoyl glutamic acid.

[0041] To promote or enhance the immobilization of surface treatment agents onto cellulose powder materials, a reaction may be induced by adsorbing a water-soluble compound having lipophilic or hydrophilic parts onto the surface of the cellulose powder. While not limited to these, for example, adding water-soluble salts of polyvalent metals such as magnesium, calcium, aluminum, titanium, zinc, or zirconium salts (e.g., zirconium sulfate or zirconium chloride), or alkali salts such as sodium, potassium, lithium, ammonium, or amine salts, can form chemical bonds. These metals typically exist as salts, such as sulfates (e.g., aluminum sulfate). This reaction chemically immobilizes the surface treatment agent onto the surface of the cellulose powder particles. In contrast, conventional methods of coating a substrate with a surface treatment agent involve adsorbing the surface treatment agent onto the surface of the substrate or pigment.

[0042] Treatment with one or more surface treatment agents modifies the surface of one or more types of cellulose powder. When a cosmetically acceptable oil (one or a mixture of oils) is included during the surface modification treatment of the cellulose powder, the oil is incorporated while the particles bind or link together. The use of oil is beneficial in these embodiments because the modified dextrins and modified amino acids useful in these embodiments are not readily soluble in water. Furthermore, the modified amino acids may be heated during mixing to soften them and allow them to spread across the surface of the cellulose powder. The surface treatment agents and oils, when combined, function as an "adhesive" that causes particles to adhere or link together with any other components present. When two or more different cellulose powders are mixed during such surface treatment, a complex is formed, which is usually distributed randomly and uniformly on the surface. Thus, when in contact with the surface treatment agent, the mixture containing one or more types of cellulose powder may contain oils, emulsifiers, etc.

[0043] After surface modification, the cellulose powder material may be mixed with another (e.g., a second) powder material such as a pigment, substrate, or extender, or with another cosmetically acceptable component such as an oil, emulsifier, or binder. The additional material may be pre-treated or untreated with a surface treatment agent. Alternatively, two or more materials (e.g., cellulose powder material plus several different coloring pigments) may be combined or mixed before contact with a surface treatment agent such as an aqueous slurry. Subsequently, two or more surface-modified or surface-treated materials can be produced simultaneously by contact with modified dextrin and / or modified amino acids. Chemical immobilization of modified dextrin and / or modified amino acids, and optionally other surface treatment agents, onto the powder material can be facilitated by the adsorption of water-soluble compounds having lipophilic or hydrophilic sites onto the surface of the powder material, as described herein or known to those skilled in the art.

[0044] In addition to modified cellulose powder, cosmetic powders and pigments may also be used. Examples of these include substrates. Substrates may include clay, mica (e.g., Timron Super Silver) TM Pearl-colored mica (such as mica coated with titanium dioxide from Rona / EMD Industries), talc, kaolin, sericite, silica (e.g., silica beads such as aluminum silicate, magnesium silicate, sodium calcium silicate, Beadyl Beads) TM This includes fumed silica, aluminosilicate minerals (zeolites), nylon (e.g., nylon beads or nylon powder), acrylates such as polymethyl methacrylate (PMMA or powder), metal powders (such as aluminum), ceramic powders (such as silicon nitride or boron nitride), cotton powder, wool powder, urethane, polystyrene and polystyrene powder, polyolefins, polyethylene and polyethylene powder, polyamides, zirconium, aluminum oxide, zirconium oxide, starch, starch powder, and starch derivatives such as aluminum starch octenyl succinate, and calcium carbonate (chalk).

[0045] The base material may further include an "extender." Extenders can be used as fillers or bulking agents in powders and dispersions (e.g., pressed foundations, loose powders, blushes, concealers, etc.) as described herein or known to those skilled in the art. As disclosed herein and as those skilled in the art would conceive, for classification purposes, extenders are typically similar to or identical to the base material in size, shape, or structure. The term "extender" is generally used to refer to a base material added to a powder or dispersion after surface treatment or surface modification of a cosmetic powder material.

[0046] Extenders are available from natural and synthetic substrates, and may or may not have color, hue, chroma (or saturation), or brightness, with variations in saturation and brightness. Like the substrates, extenders are typically larger than 1 micron (1 μm), for example, between approximately 1 and 30 microns, and can take on various shapes, such as spherical, elliptical, or "platy."

[0047] Extenders include, but are not limited to, talc, kaolin (clay), natural and synthetic mica (including muscovite mica and sericite), titanium-containing mica, cotton powder, starch, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, calcium silicate, synthetic silicate, clay, bentonite, montmorillonite, calcite, chalk, bismuth oxychloride, boronitride, fumed silica, silica beads, plastic beads such as acrylic, nylon (such as nylon 12), nylon beads, aluminum, calcium, or sodium silicate, and barium sulfate.

[0048] Additional cosmetic powder materials may further include pigments. As used herein, the term “pigment” includes “dye” and is a natural or synthetic material having a specific color, hue, color tone, hue, chroma or saturation, or lightness. Pigments may be either organic or inorganic, classified by their chemical properties. Pigments typically have a primary particle size of about 3 microns or less. Pigments are typically about an order of magnitude smaller in size than the substrate, for example, with a diameter of about 0.01 to 1.0 microns. Other pigments, such as pearl pigments, are typically larger in size, for example, 10, 20, 30, 40, or 50 to 100 microns (μm). Therefore, cosmetic powder materials, whether substrates, pigments, or other powders, typically have an average particle size in the range of about 0.01 to about 100 μm, or about 0.05 to about 50 μm, or about 0.1 to about 35 μm.

[0049] Inorganic pigments include, but are not limited to, white titanium dioxide pigments (e.g., rutile, anatase, and ultrafine TiO2 particles) and zinc oxide (e.g., ultrafine ZnO particles). These may have a primary size of approximately 0.25 μm in pigment grade or less than approximately 0.1 μm in ultrafine particle grade. Other inorganic pigments include zirconium oxide, zirconium dioxide, iron oxides (including yellow, red, brown, green, and black iron oxides), ultramarine (ultramarine blue, ultramarine violet, ultramarine pink, etc.), pearl pigments (e.g., mica, titanized mica, bismuth oxychloride, etc.), manganese violet, Prussian blue, chromium oxide, chromium hydroxide, and carbon black. Organic pigments include, but are not limited to, dye lakes, β-carotene, carmine, and chlorophyll.

[0050] The powder material may be an inorganic powder such as an extender pigment. Examples of extender pigments, though not limited to these, include mica, sericite, talc, kaolin, synthetic mica, muscovite, phlogopite, epidolite, biotite, calcium carbonate, magnesium carbonate, calcium phosphate, alumina, magnesium oxide, aluminum hydroxide, barium sulfate, magnesium sulfate, silicic acid, anhydrous silicic acid, magnesium silicate, aluminum silicate, magnesium aluminum silicate, calcium silicate, barium silicate, strontium silicate, silicon carbide, magnesium aluminate, magnesium aluminometasilicate, chlorohydroxyaluminum, clay, bentonite, zeolite, smectite, hydroxyapatite, ceramic powder, boron nitride, and silica.

[0051] As for powder materials, Excel Mica, Excel Pearl, and Powder La are sold by Miyoshi Chemical Co., Ltd. Examples of special composite extender pigments include white pigments such as Vie, titanium dioxide, zinc oxide, and cerium oxide; colored pigments such as red iron oxide, yellow iron oxide, black iron oxide, chromium oxide, chromium hydroxide, Prussian blue, ultramarine, inorganic blue pigments, carbon black, titanium dioxide, mango violet, cobalt violet, tar lake dyes, and natural lake dyes; and glossy pigments such as bismuth oxychloride, titanium mica, fish scale guanine, and synthetic mica coated with titanium dioxide; powders obtained by coating silica flakes sold by Nippon Sheet Glass Co., Ltd. under the product name "MetaShine" with titanium dioxide; powders obtained by coating alumina flakes with tin oxide and titanium dioxide; powders obtained by coating aluminum flakes with titanium dioxide; powders obtained by coating copper flakes sold by Eckart, Inc. in the United States with silica; powders obtained by coating bronze flakes with silica; and powders obtained by coating aluminum flakes with silica. However, the list is not limited to these.

[0052] Suitable powder materials include, but are not limited to, inorganic pigments such as titanium dioxide, zinc oxide, zirconium dioxide, iron oxide (including yellow, red, and black), ultramarine (ultramarine blue, ultramarine violet, etc.), and manganese violet. The powder material may be any or all of the suitable powder materials listed above.

[0053] Cellulose powders whose surfaces are modified with at least one modified dextrin and / or modified amino acid (including its salt form) typically have an average treatment ratio of about 0.1 to 15% by weight of modified dextrin and / or modified amino acid per 100 parts by weight of cellulose powder. Cellulose powders can also be treated with powders containing about 0.1 to about 10% by weight of modified dextrin and / or modified amino acid, or about 1 to about 8% by weight of modified dextrin and / or modified amino acid, or about 1 to about 7% by weight of modified dextrin and / or modified amino acid. The amount of modified dextrin and / or modified amino acid used as a surface treatment agent may also vary depending on the type of cellulose powder. For example, in the case of ultrafine particle cellulose powder, more modified dextrin and / or modified amino acid may be used, for example, twice or three times the amount used for powders with a small surface area. By using the guidelines described herein, a person skilled in the art will be able to determine the appropriate amount of modified dextrin and / or modified amino acid to be used as a surface treatment agent depending on the type of powder to be treated.

[0054] Therefore, the surface-treated cellulose powder according to the embodiment may include at least one cellulose powder having a modified surface on which at least one modified dextrin and / or modified amino acid, or salts thereof, are chemically immobilized on the surface of the powder material. The treated powder material can be used as is in a cosmetic composition, or it can be further treated with one or more surface treatment agents. Other cosmetic powders may be mixed with the cellulose-treated powder (before or after surface treatment) to prepare a suitable composition. The cosmetic powders thus added may be further treated with one or more surface treatment agents. Specific examples of surface treatment agents, but not limited to these, include surfactants, detergents, wetting agents, emulsifiers, and other surfactants. Surfactants can be nonionic, anionic, cationic, amphoteric, hydrophobic, or hydrophilic.

[0055] Surface treatment agents for cosmetic powders other than cellulose powders described herein typically contain one or more reactive groups in their structure. For example, they may contain hydrophilic moieties (e.g., carboxyl groups, phosphorus groups, sulfur groups, silanol groups, or silane groups) or hydrophobic moieties (e.g., hydrocarbons, dialkyl(CH3-,C2H5-)polysiloxanes, perfluoroalkyls, etc.). Surface treatment agents may or may not contain one or more hydroxyl groups or alkylene oxide moieties such as ethylene oxide or propylene oxide. Those containing hydroxyl groups in their structure and being hydrophilic can be supplied to the surface after the reaction is complete.

[0056] Surface treatment agents for cosmetic powders other than cellulose powder described herein include, but are not limited to, acyl collagen, ether carboxylic acids, lactic acid, gluconic acid, galacturonic acid, glucarolactone, gallic acid, glucoheptanoic acid, amino acids (such as teleonine and serine) and their salts, acyl amino acids (such as acyl glutamate, acyl sarcosinate, acyl glycinate, and acyl alaninate), fatty acids and their salts, and glycerol phosphate esters (such as lecithin). In addition to these, examples of surface treatment agents include, but are not limited to, methicone, dimethicone, and polyethylene having free carboxylic acids.

[0057] Examples of anionic surfactants (surfactants) in cosmetic powders other than cellulose powder as described herein include soap (fatty acid / alkyl carboxylate), hydroxy fatty acid, alkyl sulfate, alkyl ether phosphate, polyoxyalkylene alkyl ether sulfate, polyoxyalkylene alkyl ether carboxylate, alkyl ether phosphate, acyl N-methyl taurate, N-acyl amino acid salts (glutamate, sarcosinate, alanate, glycinate, β-alanate), acyl peptide (acyl collagen, acyl silk protein), sodium cocoate, ste Examples include aric acid, isostearic acid, potassium palmitate, sodium laurate, 12-hydroxystearic acid, sodium lauryl sulfate, sodium myristyl phosphate, sodium myristoyl sarcosinate, sodium polyoxyethylene lauryl sulfate, polyoxyethylene myristyl carboxylate, potassium myristate, zinc gluconate, isostearyl sebacate, sodium myristoyl taurate, disodium stearoyl glutamate, disodium cocoyl glutamate, arginine laurylglycinate, and sodium dilauramid glutamate lysine.

[0058] Examples of surface treatment agents suitable for cosmetic powders other than the cellulose powder described herein include one or more of the surface treatment agents disclosed in U.S. Patent No. 6,887,494, U.S. Patent Application Publication No. 2008 / 0299158, and U.S. Patent Application Publication No. 2011 / 0318286. All of these disclosures are incorporated herein by reference.

[0059] Cellulose powder can be used in cosmetic compositions comprising surface-treated cellulose powder and a carrier acceptable for cosmetic use. In one embodiment, the amount of surface-treated cellulose powder is in the range of about 0.1% to about 50% by weight, or about 0.5% to about 30% by weight, or about 1% to about 20% by weight, based on the weight of the composition.

[0060] The amount of cellulose powder used varies greatly depending on the formulation (e.g., liquid formulations, powder formulations, skin lotions, body soaps, shampoos, conditioners, hair styling products, etc.). For example, in the case of powder formulations such as makeup foundations, the amount of processed cellulose powder used is approximately 5% to 50% by weight, or approximately 15% to 40% by weight, or approximately 25% to 35% by weight, or approximately 30% by weight. In the case of skin lotion formulations, the amount of processed cellulose powder used is approximately 0.1% to 15% by weight, or approximately 1% to 10% by weight, or approximately 2% to 7% by weight, or approximately 5% by weight. In the case of body soap formulations, the amount of processed cellulose powder used is approximately 2% to 40% by weight, or approximately 5% to 20% by weight, or approximately 7% to 15% by weight, or approximately 10% by weight.

[0061] The cosmetic compositions useful in the embodiments described herein may further contain other components that have conventionally been useful in various cosmetic compositions. Any carrier suitable for cosmetic use may be used along with the processed cellulose powder material. Examples of such carriers include water, glycerin, dimethicone, beeswax, and glyceryl stearate. Other components commonly used in cosmetics may also be included as needed. For example, talc, kaolin, sericite, muscovite, phlogopite, red mica, biotite, synthetic mica, lithia mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, barium sulfate, strontium silicate, metal wolframic acid salts, or inorganic powders such as silica, hydroxyapatite, zeolite, boron nitride, and ceramic powder; organic powders such as nylon powder, polyethylene powder, polystyrene powder, benzoguanamine powder, polyfluoroethylene powder, distyrenebenzene polymer powder, epoxy powder, acrylic powder, silicone powder, microcrystalline cellulose; titanium dioxide and zinc oxide. These include various inorganic white pigments, inorganic red pigments such as iron oxide (red iron oxide) and iron titanate, inorganic brown pigments such as γ-iron oxide, inorganic yellow pigments such as ochre and yellow iron oxide, inorganic black pigments such as tetravalent acidic iron oxide and carbon black, inorganic purple pigments such as mango violet and cobalt violet, inorganic green pigments such as chromium oxide, chromium hydroxide, and cobalt titanate, inorganic blue pigments such as ultramarine blue and Prussian blue, pearl pigments such as titanium dioxide-coated mica, titanium dioxide-coated bismuth oxychloride, bismuth oxychloride, titanium dioxide-coated talc, fish scale foil, and colored titanium dioxide-coated mica, metal powder pigments such as aluminum powder and copper powder, and colored composite pigments such as iron-doped zinc oxide and iron-doped titanium dioxide.

[0062] Other pigments, such as Red 201, Red 202, Red 204, Red 205, Red 220, Red 226, Red 228, Red 405, Orange 203, Orange 204, Yellow 205, Yellow 401, Blue 404, and organic chlorophyll pigments, such as FD&C (as defined by the U.S. Federal Food, Drug, and Cosmetic Act) Red 3, Red 104, Red 106, Red 227, Red 230, Red 4 Natural colorants such as No. 01, Red No. 505, Orange No. 205, FD&C Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Orange No. 3, Zirconium, Barium, Blue No. 1 Aluminum Lake, β-carotene, Squalane, Mineral Oil, Petrolatum, Microcrystalline Wax, Ozokerite, Ceresin and other hydrocarbon oils, Myristic Acid, Palmitic Acid, Stearic Acid, Oleic Acid, Isosteate Organic solvents such as aric acid, cetyl alcohol, hexadecyl alcohol, oleyl alcohol, cetyl 2-ethylhexanoate, ethylhexyl palmitate, octyldodecyl myristate, neopentyl glycol di-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, octyldosyl oleate, isopropyl myristate, glyceryl triisostearate, caprylic / capric triglyceride, olive oil, avocado oil, yellow beeswax, myristyl myristate, mink oil, lanolin oil, silicone oil, higher fatty acid oil, fatty acid ester oil, higher alcohol, wax-based oil components, cyclopentasiloxane, dimethicone, trimethylsiloxysilicate, acetone, toluene, butyl acetate, and acetate esters may be used in various amounts.

[0063] Resins such as alkyd resins, urea-formaldehyde resins, and nylon-12, plasticizers such as camphor and acetyl tributyl citrate, UV absorbers, antioxidants, preservatives, emulsifiers, surfactants, stabilizers, defoamers, humectants, fragrances, water, alcohol, and thickeners can also be used. Emulsifiers are not limited to these, but examples include cetyl dimethicone copolyol, polyglyceryl-4 isostearate, glyceryl stearate, PEG-100 stearate, cetyl alcohol, dicetyl phosphate, and ceteth-10 isostearate phosphate.

[0064] Surfactants typically include nonionic surfactants. Nonionic surfactants are not limited to these, but examples include polyoxyalkylene (PEG and / or PPG) type nonionic emulsifiers with the following structures. [ka]

[0065] Here, R1 is selected from the group consisting of alkyl groups, alkylamide groups, alkenyl groups, alkynyl groups, alkoxy groups, aryl groups, cycloalkyl groups, and arylalkyl groups, each of which may be substituted with one or more hydroxyl groups, and further substituted with one or more alkoxyl groups, carboxyl groups, or oxo groups. R1 is approximately C8 to C8. 24 R2 has the number of carbon atoms and is selected from the group consisting of -C2H4-, -C3H6-, and -C4H8-.

[0066] Cellulose powder surface-treated with at least one modified dextrin and / or modified amino acid can be prepared by preparing a mixture of oil, at least one modified dextrin or a salt thereof, and / or at least one modified amino acid or a salt thereof, and at least one cellulose powder, and optionally heating the mixture. When at least one modified amino acid is used as the surface treatment material, it is preferable to heat the mixture during the initial formation. The mixture is homogenized by stirring at high speed to obtain a uniformly dispersed homogenized powder mixture. The homogenized powder mixture is then brought into contact with a neutralizing agent (e.g., Al2(SO4)3) to neutralize the homogenized powder mixture and chemically fix at least one modified dextrin and / or modified amino acid to the surface of the cellulose powder. This method may further include steps of heating during or after stirring, and filtering and drying the surface-modified cellulose powder.

[0067] In certain embodiments, about 1 to about 10 g, or about 2 to about 8 g, or about 3 to about 5 g of modified dextrin and / or modified amino acids, or salts thereof, are added to about 90 to about 99 g, or about 92 to about 98 g, or about 95 to about 97 g, of a drug suitable for dissolving or dispersing modified dextrin and / or modified amino acids. The drug is preferably an oil. Thus, embodiments include using about 1 to about 10 parts by weight, or about 2 to about 8 parts by weight, or about 3 to about 5 parts by weight, or about 3 parts by weight of modified dextrin and / or modified amino acids, or salts thereof, added to about 90 to about 99 parts by weight, or about 92 to about 98 parts by weight, or about 95 to about 97 parts by weight, of a drug suitable for dissolving or dispersing modified dextrin and / or modified amino acids. Modified dextrin and / or modified amino acids, or salts thereof, may be added to a suitable agent for dissolving or dispersing the modified dextrin and / or modified amino acids at a temperature of approximately 25 to approximately 95°C, or approximately 40 to approximately 80°C, or approximately 70°C, and the mixture may be mixed in a disperser for a sufficient amount of time to homogenize it. Any disperser and / or mixing apparatus may be used. A suitable disperser is the ROBOMIX(R) disperser, commercially available from Primix Corporation (Osaka, Japan). The mixture may be mixed for approximately 10 minutes to 1 hour, or approximately 15 minutes to 45 minutes, or approximately 18 minutes to 30 minutes, or approximately 20 minutes, until it is thoroughly homogenized.

[0068] After this, cellulose powder may be added to the homogenized mixture while stirring. The amount of cellulose powder added depends on the amount of agent used that is suitable for dissolving or dispersing the modified dextrin and / or modified amino acids. Generally, about 50% to 150% by weight, or about 75% to 125% by weight, or about 90% to 110% by weight, or about 98% to 105% by weight, or about the same amount as the agent, based on the weight of the agent, is added. In one embodiment, about 50g to 150g of cellulose powder, or about 75g to 125g, or about 90g to 110g, or about 98g to 105g, or about 97g of powder is added. The cellulose powder may be mixed in a disperser and / or mixer for a sufficient amount of time to thoroughly disperse the powder. The powder may be mixed at a sufficient temperature for a certain period of time until it is thoroughly dispersed.

[0069] Mixing is performed for approximately 10 seconds to approximately 5 minutes, or approximately 20 seconds to approximately 3 minutes, less than 1 minute, or approximately 40 seconds, and is repeated 2 to 10 times, or 2 to 8 times, or approximately 3 times. In one embodiment, the mixing time is 40 seconds and the number of repetitions is 3. The mixing temperature of the components may be approximately 25°C to approximately 95°C, or approximately 40°C to approximately 80°C, or approximately 70°C.

[0070] A suitable neutralizing agent may be added to the powder-containing mixture to adjust the pH of the mixture to approximately 2 to approximately 10, or approximately 3 to approximately 8, or approximately 4 to approximately 7, or approximately 4.0. In embodiments, any neutralizing agent may be used, and a preferred neutralizing agent is aluminum sulfate. The neutralizing agent may be added to the mixture by weighing until the pH reaches the desired value. Once the target pH is reached, the product may be removed from the mixture by an appropriate method such as filtration or drying. The cellulose powder treated with modified dextrin and / or modified amino acids may be dried at a temperature of approximately 75 to approximately 200°C, or approximately 90 to approximately 150°C, or approximately 105°C, for a time sufficient to dry the powder. In the embodiments disclosed above, cellulose powder treated with modified dextrin and / or modified amino acids can be dried for a period of about 1 to about 15 hours, or about 2 to about 10 hours, or about 4 to about 8 hours, or about 6 hours to produce about 100 g of cellulose powder treated with modified dextrin and / or modified amino acids.

[0071] Cellulose powder treated with modified dextrin and / or modified amino acids can be used in cosmetic compositions containing conventionally used cosmetic additives. Such compositions may, for example, contain up to about 25 wt% of non-volatile oil. The non-volatile oil may contain an organic UV active substance that functions as a UV protectant ("sunscreen"). Preferably, two or more organic UV active substances are used to achieve broad protection in the UV region. For example, a combination of at least one UV protectant that primarily protects from UVA light and at least one UV protectant that primarily protects from UVB light may be used.

[0072] A wide variety of conventional UV protective agents can be appropriately used in this embodiment. While not limited to these, examples of organic UV activators include: 2-ethylhexyl p-methoxycinnamate (commercially available as PARSOL MCX), butyl methoxydibenzoylmethane, 2-hydroxy-4-methoxybenzophenone, 2-phenylbenzimidazole-5-sulfonic acid, octyldimethyl-p-aminobenzoic acid, octocrylene, 2-ethylhexyl N,N-dimethyl-p-aminobenzoate, p-aminobenzoic acid, 2-phenylbenzimidazole-5-sulfonic acid, octocrylene (Parsol 340, DSM), oxybenzone, homomenthyl salicylate, octyl salicylate, 4,4'-methoxy-t-butyldibenzoylmethane, 4-isopropyldibenzoylmethane, 3-benzylidene camphor, 3-(4-methylbenzylidene) camphor, Eusolex TM Examples include 6300, avobenzone (Parsol 1789, DSM), avobenzone, PABA, octyldimethyl-PABA, phenylbenzimidazole sulfonic acid, cinoxate, dioxybenzone (benzophenone-8), oxybenzone (benzophenone-3), homosalate, menthyl anthranilate, octysalate, surisobenzone, trolamine salicylate, terephthalylidene dicamphor sulfonic acid, 4-methylbenzylidene camphor, methylenebisbenzotriazolyltetramethylbutylphenol, bis-ethylhexyloxyphenol methoxyphenol triazine, bisimidazilate, drometrizole trisiloxane, octyltriazone, diethylaminohydroxybenzoylhexylbenzoate, iscotridinol, polysilicone-15, amyloxate, ethylhexyldimethoxybenzylidene dioxoimidazolidine propionate, and mixtures thereof.

[0073] The non-volatile oil may contain, in addition to the UV activator, an auxiliary oil that serves as a solvent for one or more UV activating oils. The auxiliary oil may provide desirable cosmetic properties such as emollient properties and a pleasant feel on the skin. Isopropyl myristate is a preferred auxiliary oil, but is not limited to it.

[0074] Non-volatile cosmetic emollient oils, which have relatively high boiling points and function as skin texture modifiers, include, but are not limited to, hydrocarbons, fatty alcohols, fatty acids, non-volatile silicone oils, and esters such as glycerides and glycol esters.

[0075] Suitable auxiliary oils include isotridecyl isononanoate, isostearyl isostearate, isocetyl isostearate, isopropyl isostearate, isodecyl isononanoate, cetyl octanoate, isononyl isononanoate, isocetyl myristate, isotridecyl myristate, isopropyl myristate, isostearyl palmitate, isocetyl palmitate, isodecyl palmitate, isopropyl palmitate, octyl palmitate, and caprylic oil. Triglycerides / Caprates, Glyceryl Tri-2-Ethylhexanoate, Neopentyl Glycol Di(2-Ethylhexanoate), Diisopropyl Dimerate, Tocopherol, Tocopheryl Acetate, Avocado Oil, Camellia Oil, Turtle Oil, Macadamia Nut Oil, Corn Oil, Mink Oil, Olive Oil, Rapeseed Oil, Egg Yolk Oil, Sesame Oil, Peach Kernel Oil, Wheat Germ Oil, Camellia (Pasanqua) Oil, Castor Oil, Linseed Oil, Safflower Oil, Cottonseed Oil, Perillic Oil Examples of commercially available oils include, but are not limited to, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, china paulownia oil, Japanese paulownia oil, jojoba oil, rice germ oil, glycerol trioctanoate, glycerol triisopalmitate, trimethylolpropane triisostearate, glycerol tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, lanolin, liquid lanolin, liquid paraffin, squalane, petrolatum, and mixtures thereof. Examples of commercially available oils include tridecyl isononanoate (Croda, trade name Crodamol TN), Hexalan (Nisshin Oil Co., Ltd.), and tocopherol acetate (Eisai Co., Ltd.).

[0076] Examples of non-volatile cosmetic emollients include, but are not limited to, waxes such as paraffin wax, microcrystalline wax, ozokerite wax, ceresin wax, carnauba wax, candelilla wax, and eicosanyl behenate.

[0077] Non-volatile silicone oils may be used, but are not limited to, polymethylphenylsiloxane, polydiphenylsiloxane, polydiethylsiloxane, and polydimethylsiloxane (dimethicone). In this disclosure, a non-volatile silicone oil is defined as having a kinematic viscosity greater than 10 centistokes (cSt).

[0078] Suitable auxiliary oils include polyalkylsiloxanes or polyallylsiloxanes disclosed in U.S. Patent No. 6,936,241. The disclosures of that patent are incorporated into this specification by reference.

[0079] Suitable auxiliary oils that can be used in this embodiment include mineral oils of various grades. Mineral oil is a liquid mixture of several hydrocarbons obtained from petroleum. Specific examples of suitable hydrocarbons include paraffin oil, mineral oil, dodecane, isododecane, hexadecane, isohexadecane, eicosene, isoeicosene, tridecane, tetradecane, polybutene, polyisobutene, and mixtures thereof.

[0080] Non-volatile oils may be considered as not containing "volatile" silicone oils. A particularly excluded volatile silicone oil is decamethylcyclopentanasilaxane, commonly known as "D5".

[0081] While embodiments have been described above, preferred embodiments are illustrated and described. As stated above, these embodiments can be used in a variety of combinations, modifications, and environments other than those described above, and it should be understood that modifications or variations are possible within the scope of the inventive concept expressed herein, corresponding to the teachings and / or the art or knowledge of the relevant technical field described above. The embodiments described herein are also intended to describe the best mode of carrying out these embodiments from known embodiments, and to enable those skilled in the art to utilize the embodiments with various modifications required for specific uses or applications in the above or other embodiments. Accordingly, this specification is not intended to limit embodiments to those disclosed herein. Furthermore, the appended claims should be construed to include alternative embodiments.

[0082] This application makes numerous references to various documents, including publications, patents, and pre-granted patent application publications. All disclosures in these publications are incorporated herein by reference to more fully illustrate the state of the art relating to this embodiment. It should be noted that this does not constitute prior art to this application or its claims. All publications, patents, and pre-granted patent application publications referenced herein are incorporated herein by reference, specifically and individually indicated for any purpose that each publication or patent application is incorporated by reference. In case of any conflict, the present disclosure shall prevail.

[0083] Embodiments will be described in more detail below. The explanation will be based on examples, but is not limited to these examples. [Examples]

[0084] Example 1 - Preparation of surface-treated powder This embodiment discloses the treatment of cellulose powder using various treatment agents.

[0085] Using a ROBOMIX(R) disperser, commercially available from Primix Corporation (Osaka, Japan), the amounts of dextrin palmitate and water listed in the table below were mixed at approximately 50°C for approximately 15-30 minutes. Commercial cellulose powder was then added to the homogenized mixture and mixed until homogenized. The temperature was raised to approximately 80°C, and the mixture was mixed approximately three times for 5 minutes each, and held for approximately 6 hours. Afterward, the samples were tested for tactile properties. The tactile properties were categorized as good or poor. The results are shown in the table below. [Table 1-1] [Table 1-2] [Table 1-3]

[0086] The data in the table above shows that treatment with modified dextrin and modified amino acids improves buoyancy and texture. Example 2 - Hydrophobicity of surface-treated powder

[0087] Using a ROBOMIX(R) disperser, commercially available from Primix Corporation (Osaka, Japan), the amounts of dextrin palmitate and oil listed in the table below were mixed at approximately 50°C for approximately 15-30 minutes. Commercial cellulose powder was added to the homogenized mixture and mixed until homogeneous. The temperature was raised to approximately 70°C, and the mixture was mixed approximately four times for 30 seconds each time, and then left to stand for approximately 6 hours. After that, the samples were photographed to evaluate whether the powder was hydrophobic. If hydrophobic, a white powder was floating on a relatively clear liquid; if not hydrophobic, the treated cellulose remained dispersed in a milky white or cloudy liquid.

[0088] The table below shows the amounts of cellulose and each surface treatment agent. [Table 2]

[0089] Photographs of the mixing containers were taken to confirm whether the surface-treated cellulose powder separated from the aqueous solution and exhibited hydrophobicity, or remained dispersed in the solution. The results are shown in Figure 1 as Samples A to G. Next, the obtained product was separated from the mixture and dried at a temperature of approximately 105°C for 16 hours to prepare approximately 100 g of cellulose powder treated with dextrin palmitate. As can be seen from Figure 1, only the cellulose powder treated with modified dextrin or modified amino acids (KLD-Sample A, or HAP-Sample B) exhibited the required hydrophobicity.

[0090] Next, the hydrophobic surface-treated cellulose powders of Sample A and Sample B were dispersed in an emulsion, mixed, and left to stand for 4 weeks at room temperature, 50°C, or -20°C. Afterward, photographs were taken of each emulsion using four different samples at each temperature. The photographs show that the treated cellulose powder is stable in the emulsion. As the stability of the emulsion increases, the droplets become finer and more uniform; as the stability decreases, the size of the dispersed droplets increases.

[0091] Figure 2 shows photographs of Sample A, in which cellulose treated with modified dextrin is dispersed in an emulsion, under various test conditions, and Figure 3 shows photographs of Sample B, in which cellulose treated with modified amino acids is dispersed in an emulsion, under various test conditions. Comparing Figures 2 and 3, it can be seen that cellulose powder treated with modified amino acids has better stability in emulsion than cellulose powder treated with modified dextrin, but both have good stability when compared with other surface treatment agents (CG). Many of the other surface treatment agents are well known and used in the relevant art, but cellulose powder treated with them was not suitable for dispersion in emulsion.

[0092] These experimental results were unexpected in that surface treatment agents known in the cosmetics industry for treating cosmetic powders such as substrates and pigments, such as dimethicone, isostearic acid, and disodium stearoyl glutamate, were not effective in hydrophobizing the surface of cellulose powder particles.

[0093] The present invention has been described with reference to particularly preferred embodiments. Those skilled in the art will readily understand that the present invention can be modified in various ways without departing from the intent and scope of the invention.

Claims

1. A hydrophobic cellulose powder, (a) Cellulose powder particles in an amount of approximately 75% to approximately 99.5% by weight, (b) A surface treatment agent selected from approximately 0.5% to approximately 25% by weight of modified dextrin or modified amino acids Equipped with, The hydrophobic cellulose powder has relatively low solubility in aqueous media, and when dispersed in an emulsion, it can provide an emulsion that remains stable for more than four weeks. Hydrophobic cellulose powder.

2. The hydrophobic cellulose powder according to claim 1, wherein the surface treatment agent is modified dextrin.

3. The hydrophobic cellulose powder according to claim 2, wherein the modified dextrin is a fatty acid ester of dextrin, and the fatty acid has about 8 to about 20 carbon atoms.

4. The hydrophobic cellulose powder according to claim 3, wherein the modified dextrin is palmitate dextrin.

5. The hydrophobic cellulose powder according to claim 1, wherein the surface treatment agent is a modified amino acid.

6. The hydrophobic cellulose powder according to claim 5, wherein the modified amino acid is an acyl amino acid in which a fatty acid is conjugated to or amidated to an amino acid.

7. The hydrophobic cellulose powder according to claim 6, wherein the amino acid is selected from the group consisting of glutamic acid, sarcosine, aspartic acid, alanine, valine, leucine, isoleucine, proline, hydroxyproline, glycine, serine, cysteine, cystine, threonine, histidine, and salts thereof.

8. The hydrophobic cellulose powder according to claim 7, wherein the amino acid is selected from glutamic acid, sarcosine, aspartic acid, glycine, and lysine.

9. The hydrophobic cellulose powder according to claim 8, wherein the amino acid is glutamic acid.

10. The aforementioned fatty acid is C ８ From C ２０ The hydrophobic cellulose powder according to claim 6, wherein the fatty acid is...

11. The aforementioned fatty acid is C １２ From C １８ The hydrophobic cellulose powder according to claim 10, wherein the fatty acid is...

12. The hydrophobic cellulose powder according to claim 1, wherein the modified amino acid is selected from the group consisting of stearoyl amino acids, or stearoyl glutamic acid, stearoyl aspartic acid, stearoyl lysine, stearoyl glycine, and mixtures thereof.

13. The hydrophobic cellulose powder according to claim 12, wherein the modified amino acid is stearoyl glutamic acid.

14. A method for producing hydrophobic cellulose powder, (a) A step of preparing a mixture of a surface treatment agent selected from modified dextrin or modified amino acids in an amount of about 0.5% to about 25% by weight and the hydrophobic cellulose powder in an agent suitable for dissolving or dispersing the surface treatment agent, wherein the weight percentage is a value based on the total weight of the surface treatment agent and the cellulose powder; (b) The step of mixing the mixture from (a) while stirring to uniformly disperse the powder in the mixture and to form a uniformly dispersed surface-treated cellulose powder mixture, (c) A step of heating the uniformly dispersed surface-treated cellulose powder mixture during or after the implementation of (b), (d) A step of separating the hydrophobic cellulose powder from the uniformly dispersed surface-treated cellulose powder mixture and optionally drying it to form hydrophobic cellulose powder. A method for producing hydrophobic cellulose powder, comprising the following features.

15. A cosmetic composition, (a) at least one hydrophobic cellulose powder, (b) Carriers that are acceptable as cosmetics and Equipped with, The at least one hydrophobic cellulose powder comprises (i) about 75% to about 99.5% by weight of cellulose powder particles, and (ii) about 0.5% to about 25% by weight of a surface treatment agent selected from modified dextrin or modified amino acids. Cosmetic composition.

16. The cosmetic composition according to claim 15, wherein the composition is in a form selected from the group consisting of powder foundation, liquid foundation, point makeup, lip products, mascara, eyeliner, skin cream, hair care products such as shampoo, conditioner, treatment, and hair styling products, hair color products, body soap, hand soap, and facial cleanser.

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