Cellulose nanocrystalline effect pigments for cosmetic applications

Abstract

The present invention relates to a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment comprises cellulose nanocrystalline flakes, the cellulose nanocrystalline flakes having an average size in the range of 10 to 6500 micrometers.

Description

[Technical Field]

[0001] The present invention relates to a cosmetic composition containing an organic effect pigment, a method for preparing a cosmetic composition containing an organic effect pigment, the use of an organic effect pigment, and a kit for preparing two cosmetic compositions containing an organic effect pigment.

[0002] Effect pigments, also known as pearlescent pigments or pearl pigments, are used to impart pearlescent, metallic, and / or iridescent-like multi-color effects to materials. For example, fluorophlogopite mica pigments, mica-based ultramarine pigments, and borosilicate flakes are used in cosmetics. Other pigments, such as colored polyethylene terephthalate (PET) glitter, are also used in cosmetics.

[0003] The cosmetics market demands colorants that are based on renewable raw materials such as cellulose and are ultimately biodegradable. For example, there is a need to replace PET glitter, which is being closely watched for its sustainability in the environment. Furthermore, given new regulations, it is also important to provide pigments that are free of heavy metals and TiO2.

[0004] Cellulose nanocrystals (CNCs) are obtained from renewable cellulose raw materials. These are acid-treated cellulose fibers. These nanocrystals are used in the cosmetics field as fillers or thickeners, as described, for example, in International Publication No. 2018 / 100065 and Japanese Patent Publication No. 2017 / 048181.

[0005] Furthermore, U.S. Patent Application Publication No. 2019 / 0002700 discloses a cellulose-based organic pigment that may be used in cosmetic applications. However, it does not describe any structural color components, and uses cellulose nanocrystalline powder containing only dyes to color the composition, with the color depending solely on the dye used.

[0006] International Publication No. 2012 / 112541 discloses a pigment composition containing two effect pigments, the hue of which corresponds to carmine. The pigment composition can be incorporated into cosmetic compositions. However, the pigment composition can only yield one color / hue in a cosmetic composition.

[0007] Summary of the Invention Therefore, the object of the present invention was to provide a cosmetic composition containing an effect pigment having color variability, while being based on renewable raw materials and biodegradability, and a method for preparing such a cosmetic composition.

[0008] Accordingly, the present invention relates to a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment comprises cellulose nanocrystalline flakes, and the cellulose nanocrystalline flakes have an average size in the range of 10 to 6500 micrometers, as defined in Reference Example 1a.

[0009] The organic effect pigment is preferably composed of cellulose nanocrystalline flakes. Accordingly, the present invention preferably relates to a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment is composed of cellulose nanocrystalline flakes, and the cellulose nanocrystalline flakes have an average size in the range of 10 to 6500 micrometers, as defined in Reference Example 1a.

[0010] In relation to the present invention, the cellulose nanocrystalline flakes preferably have an average size in the range of 50 to 2000 micrometers, more preferably in the range of 200 to 900 micrometers, and more preferably in the range of 400 to 800 micrometers, as defined in Reference Example 1a.

[0011] Cellulose nanocrystalline flakes are determined as specified in Reference Example 1b, ranging from 1 to 200 mm in size. 2 The range, more preferably 5 to 175 mm 2range, more preferably 10 to 150 mm 2 It is preferable that the average surface area has a range of [specify range].

[0012] The cellulose nanocrystalline flakes preferably have an average thickness in the range of 30 to 200 micrometers, more preferably in the range of 40 to 150 micrometers, and more preferably in the range of 50 to 100 micrometers, as determined as described in Reference Example 1c.

[0013] The cellulose nanocrystalline flakes are preferably circular or hexagonal in shape.

[0014] Cellulose nanocrystalline flakes are preferably iridescent.

[0015] The cosmetic composition preferably contains an amount of organic effect pigment in the range of 0.025 to 99% by weight, more preferably 0.04 to 80% by weight, more preferably 0.05 to 30% by weight, more preferably 0.10 to 20% by weight, more preferably 0.5 to 15% by weight, more preferably 1 to 10% by weight, and more preferably 2 to 8% by weight, based on the total weight of the cosmetic composition. The cosmetic composition more preferably contains an amount of organic effect pigment in the range of 3 to 7% by weight, based on the total weight of the cosmetic composition.

[0016] Accordingly, the present invention relates to a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment comprises, more preferably consists of, cellulose nanocrystalline flakes, the cellulose nanocrystalline flakes having an average size in the range of 10 to 6500 micrometers, more preferably 50 to 2000 micrometers, as determined as defined in Reference Example 1a, and the cosmetic composition contains an amount of the organic effect pigment in the range of 0.025 to 99% by weight, more preferably 0.04 to 80% by weight, more preferably 0.05 to 30% by weight, more preferably 0.10 to 20% by weight, more preferably 0.5 to 15% by weight, more preferably 1 to 10% by weight, more preferably 2 to 8% by weight, and more preferably 3 to 7% by weight, based on the total weight of the cosmetic composition.

[0017] In relation to the present invention, it is preferable that the cosmetic composition further comprises a liquid phase in which cellulose nanocrystalline flakes form a mixture with the liquid phase, and more preferably the liquid phase comprises a liquid medium acceptable for cosmetics.

[0018] The temperature of the composition is preferably in the range of 5 to 70°C, more preferably in the range of 10 to 60°C, and more preferably in the range of 15 to 50°C. Furthermore, it is preferable that 99 to 100% by weight, more preferably 99.5 to 100% by weight, and more preferably 99.9 to 100% by weight of the cellulose nanocrystalline flakes are dispersed in a liquid medium acceptable for cosmetic use.

[0019] In cosmetic compositions, the color of cellulose nanocrystalline flakes in the visible spectrum is preferably dependent on the dielectric constant of the liquid phase.

[0020] The liquid phase is preferably an aqueous or anhydrous phase.

[0021] With respect to the aqueous phase, it is preferable that the amount of water be in the range of 40 to 99% by weight, more preferably 50 to 98.5% by weight, and more preferably 60 to 98% by weight, based on the total weight of the liquid phase.

[0022] Thus, the present invention is preferably a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment contains cellulose nanocrystal flakes, more preferably consists of cellulose nanocrystal flakes, and the cellulose nanocrystal flakes have an average size in the range of 10 to 6500 micrometers, more preferably in the range of 50 to 2000 micrometers, as determined as defined in Reference Example 1a. The cosmetic composition further includes a liquid phase, and the cellulose nanocrystal flakes form a mixture with the liquid phase. The liquid phase more preferably includes a liquid medium acceptable for cosmetics. The liquid phase is an aqueous phase containing water in an amount in the range of 40 to 99% by weight, more preferably in the range of 50 to 98.5% by weight, more preferably in the range of 60 to 98% by weight, based on the total weight of the liquid phase. It should be noted that the dielectric constant of the aqueous phase is different from that of the anhydrous phase. Therefore, depending on the liquid phase and, as a result, its dielectric constant, the color of the cellulose nanocrystal flakes in the cosmetic composition changes in the visible spectrum.

[0023] In relation to the present invention, with respect to the anhydrous phase, it is preferable to contain oil in an amount in the range of 40 to 90% by weight, more preferably in the range of 45 to 89.5% by weight, more preferably in the range of 50 to 89% by weight, based on the total weight of the liquid phase.

[0024] The oil contained in the anhydrous phase is preferably one or more of mineral oil, animal oil, vegetable oil, and synthetic oil, more preferably one or more of vegetable oil, mineral oil, and synthetic oil, more preferably one or more of synthetic oil and mineral oil, and more preferably synthetic oil.

[0025] Therefore, the present invention preferably relates to a cosmetic composition containing an organic effect pigment, wherein the organic effect pigment contains cellulose nanocrystal flakes, more preferably consists of cellulose nanocrystal flakes, and the cellulose nanocrystal flakes have an average size in the range of 10 to 6500 micrometers, more preferably in the range of 50 to 2000 micrometers, as determined as defined in Reference Example 1a. The cosmetic composition further contains a liquid phase, and the cellulose nanocrystal flakes form a mixture with the liquid phase. The liquid phase more preferably contains a liquid medium acceptable for cosmetics. The liquid phase is an anhydrous phase containing an amount of oil in the range of 40 to 99% by weight, more preferably in the range of 45 to 89.5% by weight, more preferably in the range of 50 to 89% by weight, based on the total weight of the liquid phase. The oil layer is preferably one or more of mineral oil, animal oil, vegetable oil, and synthetic oil, more preferably one or more of vegetable oil, mineral oil, and synthetic oil, more preferably one or more of synthetic oil and mineral oil, and more preferably synthetic oil. Relates to a cosmetic composition.

[0026] In relation to the present invention, the cosmetic composition preferably further contains at least one additional cosmetic-acceptable component other than the organic effect pigment. The cosmetic-acceptable components are preferably one or more of surfactants, oils other than the previously defined oils, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheology agents, excipients, emulsifiers, fragrances, thickeners, polymers, gel formers, light protectants, antioxidants, defoamers, resins, stabilizers, bactericides, propellants, desiccants, moisturizers, antioxidants, and plant extracts. More preferably, the cosmetic-acceptable components are one or more of surfactants, oils other than the previously defined oils, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheology agents, excipients, emulsifiers, and fragrances. Even more preferably, the cosmetic-acceptable components are one or more of surfactants, oils other than the previously defined oils, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, and rheology agents.

[0027] The cosmetic composition further comprises at least one additional cosmetic-acceptable component other than the organic effect pigment, wherein the at least one cosmetic-acceptable component is dissolved in a liquid medium, and the at least one cosmetic-acceptable component forms a liquid phase together with the liquid medium, and more preferably the at least one additional cosmetic-acceptable component other than the organic effect pigment is as defined above.

[0028] The cosmetic composition is preferably in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension.

[0029] It is preferable that 0 to 0.001% by weight, more preferably 0 to 0.0001% by weight, and more preferably 0 to 0.00001% by weight of the cosmetic composition consists of effect pigments other than the organic effect pigments specified above.

[0030] It is preferable that 0 to 0.001% by weight, more preferably 0 to 0.0001% by weight, and more preferably 0 to 0.00001% by weight of the cosmetic composition consists of a polyelectrolyte.

[0031] It is preferable that the cellulose nanocrystalline flakes are not coated with one or more inorganic oxides. In fact, it is unnecessary to coat the cellulose nanocrystalline flakes with inorganic oxides to exhibit different colors, preferably absorbant colors, in cosmetic compositions.

[0032] Cellulose nanocrystalline flakes are preferably obtained or can be obtained by a method comprising (i) and (ii) as defined below.

[0033] Furthermore, the present invention relates to a cosmetic composition, preferably a method for preparing the cosmetic composition as defined above according to the present invention, (i) Prepare an aqueous dispersion containing water and cellulose nanocrystals; (ii) The aqueous suspension prepared according to (i) is left to dry to obtain a film, and then the film is crushed into flakes to obtain an organic effect pigment; (iii) A mixture comprising the organic effect pigment obtained from (ii), a liquid phase, and optionally at least one additional cosmetically acceptable component other than the organic effect pigment obtained from (ii) is prepared to obtain a cosmetic composition. This includes methods.

[0034] (i) In the aqueous dispersion prepared according to (i), the cellulose nanocrystals are preferably present in an amount ranging from 0.05 to 10% by weight, more preferably from 0.1 to 8% by weight, more preferably from 0.5 to 6% by weight, more preferably from 0.75 to 5% by weight, and more preferably from 1 to 4% by weight, based on the total weight of the aqueous dispersion.

[0035] The cellulose nanocrystals in the aqueous dispersion prepared according to (i) are nanocrystals of sodium cellulose sulfate, and the sulfur content is preferably less than 1% by weight, more preferably less than 0.9% by weight, based on the weight of the cellulose nanocrystals.

[0036] The aqueous dispersion prepared according to (i) is preferably an acidic aqueous dispersion, and the aqueous phase of the dispersion has a pH in the range of 0 to 5, more preferably 1 to 4, and more preferably 2 to 3. The pH is preferably determined as described in Reference Example 1d.

[0037] The aqueous dispersion prepared according to (i) further contains an acid, which is more preferably one or more of hydrochloric acid, sulfonic acid, nitric acid, and citric acid, more preferably one or more of hydrochloric acid, nitric acid, and citric acid, more preferably one or more of hydrochloric acid and citric acid, and more preferably hydrochloric acid.

[0038] The water contained in the aqueous dispersion prepared according to (i) is preferably deionized water.

[0039] The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) preferably have an average particle size in the range of 1 to 50 micrometers. The average particle size is preferably determined as described in Reference Example 1e.

[0040] The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) are preferably hydrolyzed cellulose nanocrystals.

[0041] The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) preferably have a crystallite average particle size in the range of 1 to 10 nm, more preferably in the range of 1.5 to 6 nm, and more preferably in the range of 2 to 5 nm, as determined as described in Reference Example 1f.

[0042] The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) preferably exhibit a crystallite mean particle length in the range of 20 to 200 nm, more preferably 30 to 150 nm, and more preferably 40 to 110 nm, as determined as described in Reference Example 1f.

[0043] The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) preferably exhibit a degree of crystallinity in the range of 70-100%, more preferably in the range of 85-100%, as determined as described in Reference Example 1g.

[0044] The cellulose nanocrystals contained in the aqueous suspension according to (i) are 150-700 m 2 Range of / g, more preferably 200~600m 2 Range of / g, more preferably 300-500m 2 It is preferable to have a BET specific surface area in the range of / g. The BET specific surface area is preferably determined as described in Reference Example 1h.

[0045] (i) The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) (a) Isolating cellulose from natural sources, more preferably from wood or cotton; (b) The isolated cellulose obtained in (a) is hydrolyzed with an acid, more preferably sulfuric acid, to obtain cellulose nanocrystals. It is possible or preferable to obtain it by a method that includes [a specific component].

[0046] The method of the present invention preferably further comprises producing cellulose nanocrystals according to (i), wherein the production is (a) Isolating cellulose from natural sources, more preferably from wood or cotton; (b) The isolated cellulose obtained in (a) is hydrolyzed with an acid, more preferably sulfuric acid, to obtain cellulose nanocrystals. Includes.

[0047] The aqueous dispersion prepared according to (i) preferably further contains a cosmetic-acceptable dye, more preferably a cosmetic-acceptable dye that is water-soluble at temperatures in the range of 10 to 50°C, more preferably 15 to 30°C.

[0048] The dyes permitted for use in cosmetics are preferably selected from the group consisting of blue dyes, black dyes, red dyes, green dyes, yellow dyes, purple dyes, orange dyes, and brown dyes.

[0049] The dyes acceptable for cosmetics are preferably present in the aqueous dispersion prepared according to (i) in an amount ranging from 0.0005 to 0.1% by weight, more preferably from 0.001 to 0.05% by weight, and more preferably from 0.001 to 0.01% by weight, based on the weight of the aqueous dispersion prepared according to (i).

[0050] The aqueous dispersion prepared according to (i) further contains a salt, which is preferably one or more of sodium chloride (NaCl), potassium chloride (KCl), sodium iodide (NaI), potassium iodide (KI), ammonium chloride (NH4Cl), and sodium sulfate (Na2SO4). In the aqueous dispersion prepared according to (i), the mass ratio of salt to water, m(salt):m(water), is preferably in the range of 0.00001:1 to 0.1:1, more preferably in the range of 0.0001:1 to 0.01:1, and even more preferably in the range of 0.0001:1 to 0.001:1.

[0051] The method preferably includes preparing an aqueous dispersion and sonicating the dispersion before (ii).

[0052] It is preferable that 99 to 100% by weight, more preferably 99.5 to 100% by weight, and more preferably 99.9 to 100% by weight of the aqueous dispersion prepared according to (i) consist of water, cellulose nanocrystals, more preferably hydrolyzed cellulose nanocrystals, more preferably the acid specified above, one or more cosmetically acceptable absorbent dyes as specified above, and the salts as specified above.

[0053] It is preferable that 0 to 0.01% by weight, more preferably 0 to 0.001% by weight, and more preferably 0 to 0.0001% by weight of the aqueous dispersion prepared according to (i) consists of a polyelectrolyte.

[0054] (ii) Preferably, the aqueous suspension prepared according to (i) is placed under drying conditions according to (ii), the aqueous dispersion prepared according to (i) is poured into a container, and the aqueous dispersion is dried in the container to obtain a film.

[0055] The drying of the aqueous dispersion is carried out in a gas atmosphere having a temperature in the range of 15 to 30°C, more preferably in the range of 18 to 25°C, for a more preferably 10 to 30 hours, wherein the gas atmosphere more preferably contains one or more of oxygen and nitrogen, and more preferably contains nitrogen, or more preferably air. Alternatively, the drying of the aqueous dispersion is carried out in a gas atmosphere having a temperature in the range of 40 to 90°C, more preferably in the range of 65 to 85°C, for a more preferably 2 to 8 hours, more preferably 3 to 7 hours, wherein the gas atmosphere more preferably contains oxygen, and more preferably contains one or more of oxygen and nitrogen, and more preferably contains nitrogen, or more preferably air.

[0056] (ii) The film obtained is preferably an iridescent film.

[0057] The film obtained in (ii) preferably has an average thickness in the range of 30 to 200 micrometers, more preferably in the range of 50 to 100 micrometers, as determined as described in Reference Example 1c.

[0058] The film preferably has a water content in the range of 0.1 to 5% by weight, more preferably in the range of 0.1 to 1% by weight, based on the total weight of the film.

[0059] It is preferable to crush the film into flakes according to (ii) until the average size of the flakes determined as specified in Reference Example 1a is in the range of 10 to 6500 micrometers, more preferably in the range of 50 to 2000 micrometers, more preferably in the range of 200 to 1000 micrometers, and more preferably in the range of 400 to 800 micrometers.

[0060] (ii) is preferably further comprising crushing the film into flakes according to (ii), and then sieving the resulting flakes.

[0061] (iii) The organic effect pigment contained in the mixture prepared according to (iii) is preferably present in an amount ranging from 0.025 to 99% by weight, more preferably from 0.04 to 80% by weight, more preferably from 0.05 to 30% by weight, more preferably from 0.10 to 20% by weight, more preferably from 0.5 to 15% by weight, more preferably from 1% to 10% by weight, more preferably from 2% to 8% by weight, and more preferably from 3% to 7% by weight, based on the total weight of the mixture.

[0062] The liquid phase in the mixture prepared according to (iii) preferably contains a liquid medium acceptable for cosmetics.

[0063] The liquid phase in the mixture prepared according to (iii) preferably has a dielectric constant in the range of 1 to 100, more preferably in the range of 2 to 80, as determined as described in Reference Example 1i.

[0064] The liquid phase in the mixture prepared in (iii) is preferably an aqueous or anhydrous phase.

[0065] With respect to the aqueous phase, it is preferable that the amount of water be in the range of 50 to 99% by weight, preferably 60 to 99% by weight, based on the total weight of the liquid phase.

[0066] The aqueous phase preferably has a pH in the range of 4 to 10, more preferably in the range of 6 to 8. The pH is preferably determined as described in Reference Example 1d.

[0067] The anhydrous phase preferably contains an amount of oil in the range of 40 to 90% by weight, more preferably 59 to 80% by weight, based on the total weight of the liquid phase.

[0068] The anhydrous phase preferably contains one or more oils from among mineral oils, animal oils, vegetable oils, and synthetic oils, more preferably one or more from among mineral oils, vegetable oils, and synthetic oils, and more preferably synthetic oils.

[0069] The mixture prepared in (iii) preferably further contains at least one additional cosmetically acceptable component other than the organic effect pigment.

[0070] Preferably, the ingredients acceptable in at least one additional cosmetic are one or more of the following: surfactants, oils other than those specified above, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, fragrances, thickeners, polymers, gel-forming agents, photoprotective agents, antioxidants, defoaming agents, resins, stabilizers, sterilizing agents, propellants, drying agents, humectants, antioxidants, and plant extracts. More preferably, the ingredients acceptable in the cosmetic are one or more of the following: surfactants, oils other than those specified above, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, and fragrances. More preferably, the ingredients acceptable in the cosmetic are one or more of the following: surfactants, oils other than those specified above, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, and rheological agents.

[0071] The mixture prepared in (iii) preferably further comprises at least one additional cosmetic-acceptable component other than the organic effect pigment, wherein the component is dissolved in a liquid medium and the at least one additional cosmetic-acceptable component forms a liquid phase together with the cosmetic-acceptable liquid medium. It is more preferable that the at least one additional cosmetic-acceptable component other than the organic effect pigment is the at least one additional cosmetic-acceptable component defined earlier, and that the liquid phase is as defined earlier.

[0072] (ii) is used to prepare a mixture containing an organic effect pigment and a liquid phase from (iii). The organic effect pigment and the liquid phase are mixed at a temperature in the range of 15 to 30°C, more preferably in the range of 18 to 25°C. It is preferable that it includes.

[0073] The method of the present invention is more preferably comprised of (i), (ii), and (iii).

[0074] The present invention further relates to a method for preparing two or more cosmetic compositions, wherein the cosmetic compositions contain the same organic effect pigment, and the organic effect pigment contains, preferably consists of cellulose nanocrystalline flakes as a colorant having different flake colors within the visible range, and the method The present invention relates to a method by which an organic effect pigment can be obtained, or is obtained, by a method comprising adjusting the dielectric constant of the liquid phase of the cosmetic composition, more preferably by a method comprising (i) and (ii) as defined above. Adjusting the dielectric constant of the liquid phase of the cosmetic composition should preferably be understood as adjusting the dielectric constant of the liquid phase of the first cosmetic composition so that the dielectric constant of the liquid phase of the first cosmetic composition is not equal to the dielectric constant of the liquid phase of the second cosmetic composition; or it should be understood as adjusting the dielectric constant of the liquid phase of the first cosmetic composition so that the dielectric constant of the liquid phase of the first cosmetic composition is not equal to the dielectric constant of the liquid phase of the second cosmetic composition.

[0075] Each cosmetic composition is preferably in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension.

[0076] The present invention further relates to the use of an organic effect pigment comprising cellulose nanocrystalline flakes as a colorant for preparing two or more cosmetic compositions, preferably in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension, wherein the two or more compositions have different flake colors within the visible range, and the organic effect pigment can be obtained or is obtained by a method comprising (i) and (ii) as defined above.

[0077] It is preferable that the liquid phases of two or more cosmetic compositions exhibit different dielectric constants. The dielectric constants are preferably determined as described in Reference Example 1i.

[0078] Preferably, the first cosmetic composition contains cellulose nanocrystalline flakes having a green absorption color with a blue iridescent sheen, and the second cosmetic composition contains cellulose nanocrystalline flakes having a blue, red, pink, black, or gray absorption color with a blue iridescent sheen.

[0079] The present invention further relates to the use of the cosmetic compositions according to the present invention and those previously defined as lip balm, eyeshadow, nail polish, mascara, eyeliner, or lipstick.

[0080] Finally, the present invention further relates to a kit for preparing two cosmetic compositions having different flake colors in the visible range, (1) an organic effect pigment preferably comprising, and preferably consisting of, cellulose nanocrystalline flakes, wherein the cellulose nanocrystalline flakes have an average size in the range of 10 to 6500 micrometers, determined as defined in Reference Example 1a, and preferably as defined above; (2) First cosmetic composition; and (3) A second cosmetic composition other than the first cosmetic composition Regarding the kit that includes this.

[0081] It is preferable that the first cosmetic composition comprises a first liquid phase and the second cosmetic composition comprises a second liquid phase, and that the first and second liquid phases exhibit different dielectric constants, more preferably as determined as described in Reference Example 1i. In relation to the present invention, this should be understood as the first liquid phase having a dielectric constant of about 2 and the second liquid phase having a dielectric constant of about 50. In fact, this makes it possible to obtain a first cosmetic composition having cellulose nanocrystalline flakes of a specific color and a second cosmetic composition having cellulose nanocrystalline flakes of a color other than that of the cellulose nanocrystalline flakes in the first cosmetic composition.

[0082] The present invention is shown by the following series of embodiments, as well as combinations of embodiments obtained by referring to the indicated dependencies and backward references. In particular, in each case where the scope of an embodiment is mentioned, for example, in the context of terms such as "a cosmetic composition according to any one of Embodiments 1 to 4", it is intended that all embodiments within this scope are explicitly disclosed to those skilled in the art, that is, it should be noted that the wording of this term should be understood by those skilled in the art as being synonymous with "a cosmetic composition according to any one of Embodiments 1, 2, 3, and 4". Furthermore, it is explicitly pointed out that the following series of embodiments do not represent a collection of claims that determine the scope of protection, but rather represent appropriately structured parts of the description of the general and preferred aspects of the present invention.

[0083] 1. A cosmetic composition containing an organic effect pigment, wherein the organic effect pigment contains cellulose nanocrystal flakes, and the cellulose nanocrystal flakes have an average size in the range of 10 to 6500 micrometers determined as defined in Reference Example 1a.

[0084] 2. The cosmetic composition according to Embodiment 1, wherein the organic effect pigment consists of cellulose nanocrystal flakes.

[0085] 3. The cosmetic composition according to Embodiment 1 or 2, wherein the cellulose nanocrystal flakes have an average size in the range of 50 to 2000 micrometers, preferably in the range of 200 to 900 micrometers, more preferably in the range of 400 to 800 micrometers determined as defined in Reference Example 1a.

[0086] 4. The cellulose nanocrystal flakes have an average surface area in the range of 1 to 200 mm 2 as determined as described in Reference Example 1b, preferably in the range of 5 to 175 mm 2 more preferably in the range of 10 to 150 mm 2 The cosmetic composition according to any one of Embodiments 1 to 3.

[0087] 5. A cosmetic composition according to any one of Embodiments 1 to 4, wherein the cellulose nanocrystalline flakes have an average thickness in the range of 30 to 200 micrometers, preferably in the range of 40 to 150 micrometers, and more preferably in the range of 50 to 100 micrometers, as determined as described in Reference Example 1c.

[0088] 6. The cosmetic composition according to any one of Embodiments 1 to 5, wherein the cellulose nanocrystalline flakes are circular or hexagonal.

[0089] 7. A cosmetic composition according to any one of Embodiments 1 to 6, wherein the cellulose nanocrystalline flakes are iridescent.

[0090] 8. A cosmetic composition according to any one of Embodiments 1 to 7, comprising an amount of organic effect pigment in the range of 0.025 to 99% by weight, preferably 0.04 to 80% by weight, more preferably 0.05 to 30% by weight, more preferably 0.10 to 20% by weight, more preferably 0.5 to 15% by weight, more preferably 1 to 10% by weight, more preferably 2 to 8% by weight, and more preferably 3 to 7% by weight, based on the total weight of the cosmetic composition.

[0091] 9. A cosmetic composition according to any one of Embodiments 1 to 8, further comprising a liquid phase, wherein the cellulose nanocrystalline flakes form a mixture with the liquid phase, and the liquid phase preferably comprises a liquid medium acceptable for cosmetics.

[0092] 10. The cosmetic composition according to Embodiment 9, wherein the temperature of the composition is in the range of 5 to 70°C, preferably in the range of 10 to 60°C, more preferably in the range of 15 to 50°C, and 99 to 100% by weight, preferably 99.5 to 100% by weight, more preferably 99.9 to 100% by weight of the cellulose nanocrystalline flakes are dispersed in a liquid medium acceptable for cosmetics.

[0093] 11. The cosmetic composition according to Embodiment 9 or 10, wherein the color of the cellulose nanocrystalline flakes in the visible spectrum depends on the dielectric constant of the liquid phase.

[0094] 12. A cosmetic composition according to any one of Embodiments 9 to 11, wherein the liquid phase is an aqueous phase or an anhydrous phase.

[0095] 13. The cosmetic composition according to Embodiment 12, wherein the aqueous phase contains an amount of water in the range of 40 to 99% by weight, preferably in the range of 50 to 98.5% by weight, and more preferably in the range of 60 to 98% by weight, based on the total weight of the liquid phase.

[0096] 14. The cosmetic composition according to Embodiment 12, wherein the anhydrous phase contains an amount of oil in the range of 40 to 90% by weight, preferably in the range of 45 to 89.5% by weight, and more preferably in the range of 50 to 89% by weight, based on the total weight of the liquid phase.

[0097] 15. The cosmetic composition according to Embodiment 12 or 14, wherein the anhydrous phase comprises one or more of mineral oils, animal oils, vegetable oils, and synthetic oils, preferably one or more of vegetable oils, mineral oils, and synthetic oils, more preferably one or more of synthetic oils and mineral oils, and more preferably synthetic oils.

[0098] 16. Further comprising at least one additional cosmetic-acceptable component other than the organic effect pigment; the cosmetic-acceptable component is preferably one or more of the following: surfactants, oils other than those described in Embodiment 15, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, fragrances, thickeners, polymers, gel-forming agents, photoprotective agents, antioxidants, defoaming agents, resins, stabilizers, sterilizing agents, propellants, drying agents, humectants, antioxidants, and plant extracts; The ingredients permissible in the cosmetic are more preferably one or more of the following: surfactants, oils other than those described in Embodiment 15, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, and fragrances; The cosmetic composition according to any one of Embodiments 1 to 15, wherein the acceptable components for the cosmetic are more preferably one or more of a surfactant, an oil other than the oil described in Embodiment 15, a cosmetic active ingredient, a preservative, a chelating agent, a neutralizing agent, and a rheological agent.

[0099] 17. A cosmetic composition according to any one of Embodiments 9 to 15, further comprising at least one additional cosmetic-acceptable component other than the organic effect pigment, wherein the at least one cosmetic-acceptable component is dissolved in the liquid medium, and the at least one cosmetic-acceptable component forms a liquid phase with the liquid medium, and the at least one additional cosmetic-acceptable component other than the organic effect pigment is preferably the one described in Embodiment 16.

[0100] 18. A cosmetic composition according to any one of Embodiments 1 to 17, which is in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension.

[0101] 19. The cosmetic composition according to any one of Embodiments 1 to 18, wherein 0 to 0.001% by weight, preferably 0 to 0.0001% by weight, and more preferably 0 to 0.00001% by weight of the cosmetic composition consists of an effect pigment other than the organic effect pigment described in any one of Embodiments 1 to 7.

[0102] 20. The cosmetic composition according to any one of Embodiments 1 to 19, wherein 0 to 0.001% by weight, preferably 0 to 0.0001% by weight, and more preferably 0 to 0.00001% by weight of the cosmetic composition consists of a polyelectrolyte.

[0103] 21. The cosmetic composition according to any one of Embodiments 1 to 20, wherein the cellulose nanocrystalline flakes are not coated with one or more inorganic oxides.

[0104] 22. The cosmetic composition according to any one of Embodiments 1 to 21, wherein the cellulose nanocrystalline flakes are obtained or can be obtained by a method comprising (i) and (ii) described in any one of Embodiments 23 to 52.

[0105] 23. A method for preparing a cosmetic composition, preferably one of the cosmetic compositions described in Embodiments 1 to 22, (i) Prepare an aqueous dispersion containing water and cellulose nanocrystals; (ii) The aqueous suspension prepared according to (i) is left to dry to obtain a film, and then the film is crushed into flakes to obtain an organic effect pigment; (iii) A mixture comprising the organic effect pigment obtained from (ii), a liquid phase, and optionally at least one additional cosmetically acceptable component other than the organic effect pigment obtained from (ii) is prepared to obtain a cosmetic composition. A preparation method including the following.

[0106] The method according to Embodiment 23, wherein the aqueous dispersion prepared in accordance with 24.(i) contains the cellulose nanocrystals in an amount ranging from 0.05 to 10% by weight, preferably 0.1 to 8% by weight, more preferably 0.5 to 6% by weight, more preferably 0.75 to 5% by weight, and more preferably 1 to 4% by weight, based on the total weight of the aqueous dispersion.

[0107] The method according to Embodiment 23 or 24, wherein the cellulose nanocrystals in the aqueous dispersion prepared in accordance with 25.(i) are nanocrystals of sodium cellulose sulfate, and the sulfur content is less than 1% by weight, more preferably less than 0.9% by weight, based on the weight of the cellulose nanocrystals.

[0108] The method according to any one of Embodiments 23 to 25, wherein the aqueous dispersion prepared in accordance with 26.(i) is an acidic aqueous dispersion, and the aqueous phase of the dispersion has a pH in the range of 0 to 5, preferably 1 to 4, more preferably 2 to 3, as determined as described in Reference Example 1d.

[0109] The method according to any one of Embodiments 23 to 26, wherein the aqueous dispersion prepared in accordance with 27.(i) further contains an acid, the acid being preferably one or more of hydrochloric acid, sulfonic acid, nitric acid, and citric acid, more preferably one or more of hydrochloric acid, nitric acid, and citric acid, more preferably one or more of hydrochloric acid and citric acid, and more preferably hydrochloric acid.

[0110] 28. The method according to any one of Embodiments 23 to 27, wherein the water contained in the aqueous dispersion is deionized water.

[0111] The method according to any one of Embodiments 23 to 28, wherein the cellulose nanocrystals contained in the aqueous suspension prepared in accordance with 29.(i) have an average particle size in the range of 1 to 50 micrometers, as determined as described in Reference Example 1e.

[0112] The method according to any one of Embodiments 23 to 29, wherein the cellulose nanocrystals contained in the aqueous suspension prepared according to 30.(i) are hydrolyzed cellulose nanocrystals.

[0113] The method according to any one of Embodiments 23 to 30, wherein the cellulose nanocrystals contained in the aqueous suspension prepared according to 31.(i) exhibit a crystallite mean particle size in the range of 1 to 10 nm, preferably in the range of 1.5 to 6 nm, more preferably in the range of 2 to 5 nm, as determined as described in Reference Example 1f.

[0114] The method according to any one of Embodiments 23 to 31, wherein the cellulose nanocrystals contained in the aqueous suspension prepared according to 32.(i) exhibit a crystallite mean particle length in the range of 20 to 200 nm, preferably in the range of 30 to 150 nm, more preferably in the range of 40 to 110 nm, as determined as described in Reference Example 1f.

[0115] The method according to any one of Embodiments 23 to 32, wherein the cellulose nanocrystals contained in the aqueous suspension prepared in accordance with 33.(i) exhibit a degree of crystallinity in the range of 70 to 100%, more preferably in the range of 85 to 100%, as determined as described in Reference Example 1 g.

[0116] The cellulose nanocrystals contained in the aqueous suspension prepared according to 34.(i) are determined to be 150-700 ml as described in Reference Example 1h. 2 Range of / g, more preferably 200~600m 2 Range of / g, more preferably 300-500m 2 A method according to any one of embodiments 23 to 33, having a BET specific surface area in the range of / g.

[0117] The cellulose nanocrystals contained in the aqueous suspension prepared in accordance with 35.(i) (a) Isolating cellulose from natural sources, more preferably from wood or cotton; (b) The isolated cellulose obtained in (a) is hydrolyzed with an acid, more preferably sulfuric acid, to obtain the cellulose nanocrystals. A method according to any one of embodiments 23 to 34, which can be obtained by a method including the following.

[0118] 36.(i) further comprises producing the cellulose nanocrystals in accordance with, (a) Isolating cellulose from natural sources, more preferably from wood or cotton; (b) The isolated cellulose obtained in (a) is hydrolyzed with an acid, more preferably sulfuric acid, to obtain the cellulose nanocrystals. A method according to any one of embodiments 23 to 35, including the method described above.

[0119] The method according to any one of Embodiments 23 to 36, wherein the aqueous dispersion prepared in accordance with 37.(i) further comprises a cosmetic-acceptable dye, preferably a cosmetic-acceptable dye that is water-soluble at temperatures in the range of 10 to 50°C, preferably 15 to 30°C.

[0120] 38. The method according to Embodiment 37, wherein the dye permissible for the cosmetic is selected from the group consisting of blue dyes, black dyes, red dyes, green dyes, yellow dyes, purple dyes, orange dyes, and brown dyes.

[0121] 39. The method according to Embodiment 37 or 38, wherein the dye acceptable for cosmetics is present in the aqueous dispersion prepared according to (i) in an amount ranging from 0.0005 to 0.1% by weight, preferably from 0.001 to 0.05% by weight, and more preferably from 0.001 to 0.01% by weight, based on the weight of the aqueous dispersion prepared according to (i).

[0122] The method according to any one of Embodiments 23 to 39, wherein the aqueous dispersion prepared in accordance with 40.(i) further contains a salt, the salt being one or more of sodium chloride (NaCl), potassium chloride (KCl), sodium iodide (NaI), potassium iodide (KI), ammonium chloride (NH4Cl), and sodium sulfate (Na2SO4).

[0123] The method according to Embodiment 40, wherein in the aqueous dispersion prepared according to 41.(i), the mass ratio of salt to water, m(salt):m(water), is in the range of 0.00001:1 to 0.1:1, preferably in the range of 0.0001:1 to 0.01:1, and more preferably in the range of 0.0001:1 to 0.001:1.

[0124] 42. The method according to any one of Embodiments 23 to 41, comprising preparing the aqueous dispersion and ultrasonically treating the dispersion before (ii).

[0125] The method according to any one of Embodiments 23 to 42, wherein 99 to 100% by weight, preferably 99.5 to 100% by weight, more preferably 99.9 to 100% by weight of the aqueous dispersion prepared according to 43.(i) consists of water, the cellulose nanocrystals, preferably hydrolyzed cellulose nanocrystals, preferably the acid according to Embodiment 27, one or more cosmetically acceptable absorbent dyes according to any one of the optionally selected Embodiments 37 to 39, and a salt according to Embodiment 40 or 41.

[0126] The method according to any one of Embodiments 23 to 43, wherein 0 to 0.01% by weight, more preferably 0 to 0.001% by weight, and more preferably 0 to 0.0001% by weight of the aqueous dispersion prepared according to 44.(i) consists of a polyelectrolyte.

[0127] 45. The aqueous suspension prepared according to (i) is placed under drying conditions according to (ii). (i) Pour the aqueous dispersion prepared according to the instructions into the container; The aqueous dispersion is dried in the container to obtain a film. A method according to any one of embodiments 23 to 44, including the method described above.

[0128] 46. ​​The method according to Embodiment 45, wherein the drying of the aqueous dispersion is carried out in a gas atmosphere having a temperature in the range of 15 to 30°C, preferably in the range of 18 to 25°C, for a more preferably 10 to 30 hours, wherein the gas atmosphere preferably contains one or more of oxygen and nitrogen, more preferably contains nitrogen, or more preferably air.

[0129] 47. The method according to Embodiment 45, wherein the drying of the aqueous dispersion is carried out in a gas atmosphere having a temperature in the range of 40 to 90°C, preferably in the range of 65 to 85°C, for a more preferably 2 to 8 hours, more preferably in the range of 3 to 7 hours, wherein the gas atmosphere preferably contains oxygen, preferably contains one or more of oxygen and nitrogen, more preferably contains nitrogen, or more preferably air.

[0130] The method according to any one of Embodiments 23 to 47, wherein the film obtained in 48.(ii) is an iridescent film.

[0131] 49. The method according to any one of Embodiments 23 to 48, wherein the film has an average thickness in the range of 30 to 200 micrometers, preferably in the range of 50 to 100 micrometers, as determined as described in Reference Example 1c.

[0132] 50. The method according to any one of Embodiments 23 to 49, wherein the film has a water content in the range of 0.1 to 5% by weight, preferably in the range of 0.1 to 1% by weight, based on the total weight of the film.

[0133] 51. The method according to any one of Embodiments 23 to 50, wherein the film is crushed into flakes according to (ii) until the average size of the flakes determined as specified in Reference Example 1a is in the range of 10 to 6500 micrometers, preferably in the range of 50 to 2000 micrometers, more preferably in the range of 200 to 1000 micrometers, and more preferably in the range of 400 to 800 micrometers.

[0134] The method according to any one of Embodiments 23 to 51, wherein (ii) further comprises crushing the film into flakes in accordance with 52.(ii), and then sieving the resulting flakes.

[0135] The method according to any one of Embodiments 23 to 52, wherein the organic effect pigment contained in the mixture prepared in accordance with 53.(iii) is present in an amount ranging from 0.025 to 99% by weight, preferably from 0.04 to 80% by weight, more preferably from 0.05 to 30% by weight, more preferably from 0.10 to 20% by weight, more preferably from 0.5 to 15% by weight, more preferably from 1% to 10% by weight, more preferably from 2% to 8% by weight, and more preferably from 3% to 7% by weight, based on the total weight of the mixture.

[0136] The method according to any one of Embodiments 23 to 53, wherein the liquid phase in the mixture prepared in accordance with 54.(iii) comprises a liquid medium acceptable for cosmetics.

[0137] The method according to any one of Embodiments 23 to 54, wherein the liquid phase in the mixture prepared in accordance with 55.(iii) has a dielectric constant in the range of 1 to 100, preferably 2 to 80, as determined as described in Reference Example 1i.

[0138] The method according to any one of Embodiments 23 to 55, wherein the liquid phase in the mixture prepared in 56.(iii) is an aqueous phase or an anhydrous phase.

[0139] 57. The method according to Embodiment 56, wherein the aqueous phase contains an amount of water in the range of 50 to 99% by weight, preferably 60 to 99% by weight, based on the total weight of the liquid phase.

[0140] 58. The method according to Embodiment 56 or 57, wherein the aqueous phase has a pH in the range of 4 to 10, preferably in the range of 6 to 8, as determined as described in Reference Example 1d.

[0141] 59. The method according to Embodiment 58, wherein the anhydrous phase contains an amount of oil in the range of 40 to 90% by weight, preferably 59 to 80% by weight, based on the total weight of the liquid phase.

[0142] 60. The method according to Embodiment 56 or 59, wherein the anhydrous phase comprises an oil which is one or more of mineral oils, animal oils, vegetable oils, and synthetic oils, preferably one or more of mineral oils, vegetable oils, and synthetic oils, and more preferably synthetic oils.

[0143] The method according to any one of Embodiments 23 to 60, wherein the mixture prepared in 61.(iii) further comprises at least one additional cosmetic-acceptable component other than the organic effect pigment.

[0144] 62. The acceptable components in the cosmetic are one or more of the following: surfactants, oils other than those described in Embodiment 60, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, fragrances, thickeners, polymers, gel-forming agents, photoprotective agents, antioxidants, defoaming agents, resins, stabilizers, sterilizing agents, propellants, drying agents, humectants, antioxidants, and plant extracts; The ingredients permissible in the aforementioned cosmetic are preferably one or more of the following: surfactants, oils other than those described in Embodiment 60, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, rheological agents, excipients, emulsifiers, and fragrances; The ingredients permissible in the aforementioned cosmetic are more preferably one or more of the following: surfactants, oils other than those described in Embodiment 60, cosmetic active ingredients, preservatives, chelating agents, neutralizing agents, and rheological agents. The method described in Embodiment 61.

[0145] The mixture prepared in 63.(iii) further comprises at least one additional cosmetic-acceptable component other than the organic effect pigment, wherein the component is dissolved in a liquid medium and the at least one cosmetic-acceptable component forms a liquid phase together with the cosmetic-acceptable liquid medium; The at least one additional cosmetic-permissible component other than the organic effect pigment is preferably the at least one additional cosmetic-permissible component described in Embodiment 62, and the liquid phase is preferably as described in any one of Embodiments 56 to 60. The method described in Embodiment 60.

[0146] A mixture containing the organic effect pigment obtained from 64.(ii) and the liquid phase according to (iii) is prepared. The organic effect pigment and the liquid phase are mixed at a temperature in the range of 15 to 30°C, preferably in the range of 18 to 25°C. A method according to any one of embodiments 23 to 63, including the method described above.

[0147] A method according to any one of embodiments 23 to 64, comprising 65.(i), (ii), and (iii).

[0148] 66. A method for preparing two or more cosmetic compositions, wherein the cosmetic compositions contain the same organic effect pigment, and the organic effect pigment contains cellulose nanocrystalline flakes as a colorant having different flake colors within the visible range, and the method is A method comprising adjusting the dielectric constant of the liquid phase of the cosmetic composition, wherein the organic effect pigment can be obtained or is obtained by a method preferably comprising (i) and (ii) described in any one of embodiments 23 to 52.

[0149] 67. The method according to Embodiment 66, wherein each of the cosmetic compositions is in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension.

[0150] 68. Use of an organic effect pigment comprising cellulose nanocrystalline flakes as a colorant for preparing two or more cosmetic compositions, preferably in the form of a cream, emulsion, foam, gel, lotion, milk, mousse, ointment, paste, spray, or suspension, wherein the two or more compositions have different flake colors within the visible range, and the organic effect pigment can be obtained or is obtained by a method comprising (i) and (ii) described in any one of embodiments 23 to 52.

[0151] 69. The use according to Embodiment 68, wherein the liquid phases of two or more cosmetic compositions exhibit different dielectric constants as determined in Reference Example 1i.

[0152] 70. The method according to Embodiment 68 or 69, wherein the first cosmetic composition comprises cellulose nanocrystalline flakes having a green absorbent color with a blue iridescent sheen, and the second cosmetic composition comprises cellulose nanocrystalline flakes having a blue, red, pink, black, or gray absorbent color with a blue iridescent sheen.

[0153] 71. Use of any one of the cosmetic compositions described in Embodiments 1 to 22 as a lip balm, eyeshadow, nail polish, mascara, eyeliner, or lipstick.

[0154] 72. A kit for preparing two cosmetic compositions having different flake colors in the visible range, (1) an organic effect pigment comprising cellulose nanocrystalline flakes, wherein the cellulose nanocrystalline flakes have an average size in the range of 10 to 6500 micrometers, determined as defined in Reference Example 1a, preferably an organic effect pigment as described in any one of Embodiments 1 to 7; (2) First cosmetic composition; and (3) A second cosmetic composition other than the first cosmetic composition. A kit that includes this.

[0155] 73. The kit according to Embodiment 72, wherein the first cosmetic composition comprises a first liquid phase, and the second cosmetic composition comprises a second liquid phase, and the first liquid phase and the second liquid phase exhibit different dielectric constants as determined in Reference Example 1i.

[0156] In relation to the present invention, the inventors have realized that the dielectric constant or polarity (determined by the dielectric constant) of a cosmetic composition or cosmetic base affects the absorption color of an organic effect pigment, i.e., cellulose nanocrystalline flakes. In fact, by increasing or decreasing the dielectric constant, it was possible to change the absorption color of the flakes (glitter) in the cosmetic composition, even while using the same initial organic effect pigment, i.e., cellulose nanocrystalline flakes. This is illustrated by different embodiments of the present invention.

[0157] In relation to the present invention, “cosmetic-permissible liquid medium” is a liquid medium that is compatible with the skin and / or its outer layer. Preferably, it is a liquid medium that has a pleasant color, scent, and / or feel and does not cause unacceptable discomfort (such as stinging pain, tightness, or redness) that would cause a consumer to refrain from using a cosmetic composition containing it.

[0158] Furthermore, in relation to the present invention, the term "liquid" in "liquid medium" or "liquid phase" means that the indicated medium or phase is liquid at a temperature of the cosmetic composition in the range of 5 to 70°C, preferably 10 to 60°C, and more preferably 15 to 50°C.

[0159] Furthermore, in relation to the present invention, the phrase "at least one cosmetic-acceptable component is dissolved in a liquid medium" means that the at least one cosmetic-acceptable component is dissolved at a temperature of the cosmetic composition in the range of 5 to 70°C, preferably 10 to 60°C, and more preferably 15 to 50°C.

[0160] Furthermore, in relation to the present invention, the phrase "X is one or more of A, B, and C" should be understood as disclosing that X is either A or B or C, or A and B, or A and C, or B and C, or A, B, and C. In this regard, it will be noted that the above abstract terms can be translated into specific examples, for example, when X is a chemical element and A, B, and C are specific elements such as Li, Na, and K, or when X is a temperature and A, B, and C are specific temperatures such as 10°C, 20°C, and 30°C. In this regard, a person skilled in the art will further note that the above terms can be extended to a less specific understanding of the features (for example, "X is one or more of A and B" discloses that X is either A, B, or A and B), or to a more specific understanding of the features (for example, "X is one or more of A, B, C, and D" discloses that X is either A, B, C, D, A and B, A and C, A and D, B and C, B and D, C and D, A and B and C, A and B and D, B and C and D, or A and B and C and D).

[0161] Furthermore, in relation to the present invention, the term "consists of" with respect to the weight percentage of one or more components represents the weight percentage of the component based on 100% by weight of the substance in question. For example, the expression "0 to 0.001% by weight of the cosmetic composition consists of effect pigments other than the organic effect pigments described in any one of Embodiments 1 to 7" means that of 100% by weight of the components constituting the cosmetic composition, 0 to 0.001% by weight consists of effect pigments other than the organic effect pigments described in any one of Embodiments 1 to 7. In other words, for example, the cosmetic composition should be understood to mean that it substantially does not contain effect pigments other than the organic effect pigments described in any one of Embodiments 1 to 7, preferably not containing the organic effect pigments described in any one of Embodiments 1 to 7.

[0162] The present invention is further illustrated by the following reference examples, comparative examples, and embodiments.

[0163] Examples Reference example 1 Determination method a. Determination of average flake size: Flakes were pressed onto a clear microscope slide and observed with a Zeiss Axio Lab.A1 optical microscope. Particle size was measured from the microscope images using Zeiss Zen software. b. Determination of the average surface area of ​​the flakes: The flakes were pressed onto a clear microscope slide and observed with a Zeiss Axio Lab.A1 optical microscope. The average surface area was measured from the microscope images using Zeiss Zen software. c. Determination of the average flake / film thickness: The thickness was measured in film form before blending with flakes. The film thickness was measured with a micrometer, and the average was taken from three points on the film. d. pH determination: The pH of formulations containing precast CNC solution and CNC flakes was measured using a Mettler Toledo InLab Routine pH probe with a Mettler Toldeo SevenCompact base unit. The pH probe was calibrated to pH buffers of pH 4, 7, and 10. e. Determination of average particle size of cellulose nanocrystals (CNCs): Particle size was determined by photon correlation spectroscopy (Zetasizer 3000, Malvern Instruments, Worcestershire, UK). Photon correlation spectroscopy (PCS) is a light scattering method, and the measured CNC particle size values ​​are the hydrodynamic radius of the equivalent sphere and do not represent the actual physical dimensions of the rod-shaped NCC particles. However, these are valid for comparative purposes. Measurements were performed on samples containing 10 mM NaCl with a final CNC concentration of 1.0–1.5 wt%. Samples were filtered through a 0.45 μm nylon Whatman syringe filter to remove dust and other large particles. f. Determination of the average particle size / length of crystallites: Measured by AFM by the National Research Council of Canada. g. Determination of crystallinity: Measured by XRD by the National Research Council of Canada. h. Determination of BET specific surface area: The BET specific surface area was determined using liquid nitrogen according to DIN66131 or DIN-ISO9277. i. Determination of dielectric constant: The dielectric constant was determined using a dielectric meter. The dielectric constants of water and other liquids, as well as methods for measuring them, are well known in the art.

[0164] Example 1: Production of iridescent flakes (organic effect pigments) of cellulose nanocrystals In Example 1.1, CelluForce NCV100 (CAS No. 9005-22-5, molecular formula [(C6O5H 10 ) 22~28 [SO3Na] 4~6 , BET specific surface area 400m 2An aqueous dispersion containing cellulose nanocrystals (with a particle size of 2.3-4.5 nm, average particle length of 44-108 nm, sulfur content of 0.86-0.89%, and pH of the aqueous dispersion of 6-7) was prepared from deionized water, cellulose nanocrystals, and hydrochloric acid. The amount of cellulose nanocrystals in the dispersion was 2-3% by weight based on the weight of the dispersion, and the pH of the aqueous phase of the dispersion was 2-3. The aqueous dispersion was poured into a large, shallow polystyrene tray to a depth of approximately 1-2 cm.

[0165] In Examples 1.2 to 1.4, various aqueous dyes were added to a dispersion of cellulose nanocrystals (see Table 1 below for the types and amounts of dyes). The pH of the resulting dispersion was 2.7. The resulting dispersion was poured into a large, shallow polystyrene tray to a depth of approximately 1-2 cm.

[0166] The dispersion was dried overnight in a fume hood to form a film, or dried in a 75°C oven for approximately 5 hours to form a film. An iridescent film was obtained (see Figure 1).

[0167] The resulting film was peeled from the tray, placed in a kitchen blender, and blended for 1-2 minutes to obtain flakes of different colors ranging in size from 10 to 1000 micrometers (see Table 1 below).

[0168] [Table 1]

[0169] Example 2: Preparation of a cosmetic composition A. Anhydrous base (Versagel M750) Mineral oil (>90% by weight) and the remainder (<10% by weight) are ethylene / propylene / styrene copolymer (and) butylene / ethylene / styrene copolymer. Dielectric constant: approximately 2 [Table 2]

[0170] [Table 3]

[0171] The CNC flakes obtained in Example 1 were placed in different cosmetic bases A, B, and C according to Table 2 below. The flakes were manually mixed into the cosmetic bases at room temperature.

[0172] [Table 4]

[0173] As can be seen from Table 2, in compositions 2.1, 2.2, and 2.3, the CNC effect pigments often give unique color properties, such as color changes based on the composition of the base in which they are suspended. That is, a single product can provide many different flake colors and holographic effects depending on how it is formulated. Compositions 2.4, 2.5, and 2.6 show what additional absorbent colors dyes and pigments can add in addition to iridescence.

[0174] Figures 2-4 show photographs and microscopic images of CNC flakes in cosmetic compositions 2.1-2.3, and Figure 5 shows photographs of CNC flakes in cosmetic compositions 2.4-2.6.

[0175] Comparative Example 1: Preparation of a cosmetic composition Pigment 1 : Chione (trademark) Celestial Gold S232L (powder) - INCI name: Synthetic Fluorphlogopite (and) Titanium Dioxide (and) Iron Oxides Pigment 2 : Cloisonne® Super Blue 636Z (powder) - INCI name: Mica (and) Titanium Dioxide (and) Ultramarines Pigment 3 : Reflecks® Dimensions Brilliant Blue GB80D (Flake) - INCI Name: Sodium Calcium Borosilicate (and) Titanium Dioxide (and) Silica

[0176] Each of the inorganic pigments listed above was placed in different bases A, B, and C as described in Example 1. The pigments were manually mixed into the cosmetic bases at room temperature.

[0177] [Table 5]

[0178] As can be seen from Table 3, with the pigments shown that do not conform to the present invention, the final color of the resulting cosmetic composition, or the final color of the flakes in the resulting cosmetic composition, is always the same, even when the pigment is placed in different cosmetic bases exhibiting different properties such as polarity. This is shown in Figures 6-8. These results demonstrate the use of the organic effect pigments of the present invention, which impart unique color properties depending on the composition of the cosmetic base. [Brief explanation of the drawing]

[0179] [Figure 1] This is a scheme illustrating the process for manufacturing iridescent film. [Figure 2a] This is a photograph of CNC flakes in cosmetic composition 2.1. [Figure 2b] Microscopic image of CNC flakes in cosmetic composition 2.1 (magnification: 5×, scale bar 200um). [Figure 3a] This is a photograph of CNC flakes in cosmetic composition 2.2. [Figure 3b] Microscopic image of CNC flakes in cosmetic composition 2.2 (magnification: 5×, scale bar 200um). [Figure 4a] This is a photograph of CNC flakes in cosmetic composition 2.3. [Figure 4b]Microscopic image of CNC flakes in cosmetic composition 2.3 (magnification: 5×, scale bar 200um). [Figure 5] These are photographs of CNC flakes in cosmetic compositions 2.4, 2.5, and 2.6. [Figure 6] This is a photograph of pigment 1 in cosmetic compositions C.1, C.4, and C.7. [Figure 7] These are photographs of pigment 2 in cosmetic compositions C.2, C.5, and C.8. [Figure 8] This is a photograph of pigment 3 in cosmetic compositions C.3, C.6, and C.9.

[0180] References - International Publication No. 2018 / 100065 brochure - Japanese Patent Publication No. 2017-048181 - U.S. Patent Application Publication No. 2019 / 0002700 - International Publication No. 2012 / 112541 brochure

Claims

1. A cosmetic composition containing an organic effect pigment, wherein the organic effect pigment comprises cellulose nanocrystalline flakes, the cellulose nanocrystalline flakes having an average size in the range of 10 to 6500 micrometers, the cosmetic composition further comprises a liquid phase, the cellulose nanocrystalline flakes forming a mixture with the liquid phase, and the liquid phase in the mixture having a dielectric constant in the range of 2 to 80.

2. The cosmetic composition according to claim 1, wherein the cosmetic composition contains the organic effect pigment in an amount ranging from 0.025% to 99% by weight, based on the total weight of the cosmetic composition.

3. The cosmetic composition according to claim 1 or 2, wherein the temperature of the composition is in the range of 5 to 70°C, and 99 to 100% by weight of the cellulose nanocrystalline flakes are dispersed in the liquid phase.

4. The cosmetic composition according to any one of claims 1 to 3, wherein the color of the cellulose nanocrystalline flakes in the visible spectrum depends on the dielectric constant of the liquid phase.

5. The cosmetic composition according to any one of claims 1 to 4, wherein the liquid phase is an aqueous phase or an anhydrous phase.

6. The cosmetic composition according to any one of claims 1 to 5, wherein the cosmetic composition further comprises at least one additional cosmetic-permissible component other than the organic effect pigment.

7. A method for preparing a cosmetic composition according to any one of claims 1 to 6, (i) Prepare an aqueous dispersion containing water and cellulose nanocrystals; (ii) The aqueous suspension prepared according to (i) is left to dry conditions to obtain a film, and then the film is crushed into flakes to obtain an organic effect pigment; (iii) A mixture containing the organic effect pigment obtained from (iii) and a liquid phase is prepared to obtain the cosmetic composition. Includes, The cellulose nanocrystalline flakes contained in the aforementioned organic effect pigment have an average size in the range of 10 to 6500 micrometers. The liquid phase in the mixture prepared according to (iii) has a dielectric constant in the range of 2 to 80. method.

8. The method according to claim 7, wherein the aqueous dispersion prepared in accordance with (i) is an acidic aqueous dispersion, and the aqueous phase of the dispersion has a pH in the range of 0 to 5.

9. The method described above is (i) further comprises producing the cellulose nanocrystals according to the said production, (a) Isolating cellulose from natural sources of cellulose; (b) The isolated cellulose obtained in (a) is hydrolyzed with acid to obtain the cellulose nanocrystals. The method according to claim 7 or 8, including the method described in claim 7 or 8.

10. The method according to any one of claims 7 to 9, wherein the aqueous dispersion prepared in accordance with (i) further comprises a dye acceptable for cosmetics.

11. The method according to any one of claims 7 to 10, wherein the liquid phase in the mixture prepared in (iii) is an aqueous phase or an anhydrous phase.

12. The method according to any one of claims 7 to 11, wherein preparing the mixture containing the organic effect pigment obtained from (ii) and the liquid phase according to (iii) comprises mixing the organic effect pigment and the liquid phase at a temperature in the range of 15 to 30°C.

13. A method for preparing two or more cosmetic compositions having different flake colors in the visible range, wherein the two or more cosmetic compositions are cosmetic compositions according to any one of claims 1 to 6, and each contains an organic effect pigment comprising cellulose nanocrystalline flakes as a coloring agent having different flake colors in the visible range, the method comprising adjusting the dielectric constant of the liquid phase of the cosmetic composition.

14. (i) The aqueous dispersion prepared in accordance with (i) contains the cellulose nanocrystals in an amount ranging from 0.05 to 10% by weight based on the total weight of the aqueous dispersion. The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) exhibit a crystallite average particle size in the range of 1 to 10 nm, The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) exhibit a crystallite mean particle length in the range of 20 to 200 nm, (i) The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) are 150 to 700 m ２ The method according to any one of claims 7 to 12, having a BET specific surface area in the range of / g.

15. The method described above is (i) Prepare an aqueous dispersion containing water and cellulose nanocrystals; (ii) The aqueous suspension prepared according to (i) is left to dry conditions to obtain a film, and then the film is crushed into flakes to obtain an organic effect pigment; (iii) A mixture containing the organic effect pigment obtained from (iii) and a liquid phase is prepared to obtain the cosmetic composition. Includes, (i) The aqueous dispersion prepared in accordance with (i) contains the cellulose nanocrystals in an amount ranging from 0.05 to 10% by weight based on the total weight of the aqueous dispersion. The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) exhibit a crystallite average particle size in the range of 1 to 10 nm, The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) exhibit a crystallite mean particle length in the range of 20 to 200 nm, (i) The cellulose nanocrystals contained in the aqueous suspension prepared according to (i) are 150 to 700 m ２ The method according to claim 13, having a BET specific surface area in the range of / g.

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