Cellulose composite particles

Abstract

The objective is to provide cellulose composite particles with a good tactile feel. [Solution] Cellulose composite particles containing cellulose-based material and powder, The powder is attached to the surface of the cellulose-based material, The weight percentage of the powder in the cellulose composite particles is 0.1 to 20% by weight, and the powder is at least one selected from hydrophobic silica, fatty acids, fatty acid metal salts, amino acid-based substances, and complex lipids. The average particle size is 1 to 100 μm. In a shear test based on JIS-Z8835, the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa is greater than 0 kPa and less than or equal to 5 kPa. Furthermore, the value obtained by dividing the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa by the shear adhesion force C10 of the powder layer at a vertical pressure of 10 kPa in the shear test (C30 / C10) is greater than 0 and less than or equal to 4. Cellulose composite particles.

Description

Technical Field

[0001] The present invention relates to cellulose composite particles.

Background Art

[0002] Cellulose particles having a spherical shape are manufactured and used by various manufacturing methods such as Patent Document 1, for example, but when contained in cosmetics, they are not satisfactory in terms of skin sensation. Further, for example, Patent Document 2 describes microcrystalline cellulose powder characterized by adding cellulose to an aqueous solution of metal soap or hydrogenated lecithin and performing surface treatment. Although the water repellency and oil repellency are improved, it is not satisfactory in terms of skin sensation. Further, Patent Document 3 describes that the cellulose composite powder has a specific range of the relationship between the shear adhesion force of the powder layer at a vertical pressure of 30 MPa and the shear adhesion force of the powder layer at a vertical pressure of 10 MPa in a shear test based on JIS-Z8835. 30 MPa is 306 kgf / cm 2 and 10 MPa is 102 kgf / cm 2 The use of cosmetics is mainly centered around spreading on the skin surface. In such applications, it is far from reality to define the characteristics of the cellulose composite powder based on the measured values at vertical pressures of 30 MPa or 10 MPa. Since it is normal not to pressurize the skin of the face etc. in MPa units during makeup, characteristics that match more actual conditions are required.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0004] This invention provides cellulose composite particles with a pleasant tactile feel. [Means for solving the problem]

[0005] The inventors of this invention discovered that cellulose composite particles exhibiting specific physical properties can reliably improve skin sensation, and thus arrived at the present invention.

[0006] In other words, the cellulose composite particles of the present invention are cellulose composite particles containing a cellulosic substance, having an average particle diameter of 1 to 100 μm, and in a shear test based on JIS-Z8835, the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa is greater than 0 kPa and 5 kPa or less, and the value obtained by dividing the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa by the shear adhesion force C10 of the powder layer at a vertical pressure of 10 kPa in the same shear test (C30 / C10) is greater than 0 and 4 or less.

[0007] The cellulose composite particles of the present invention preferably have a circularity of 0.4 to 1.0.

[0008] The cellulose composite particles of the present invention preferably have an oil absorption capacity of 10 to 200 ml / 100 g.

[0009] The cellulose composite particles of the present invention preferably have powder attached to the surface of the cellulose-based material.

[0010] The cellulose composite particles of the present invention preferably have an alkyl group having 2 to 30 carbon atoms and / or two or more methyl groups in the powder.

[0011] The cellulose composite particles of the present invention preferably have at least one functional group selected from a hydroxyl group, a primary to tertiary amino group, a carboxyl group, a carboxyl base, a phosphate group, a phosphate base, a phosphorylcholine group, a sulfonic acid group, and a silyl group.

[0012] In the cellulose composite particles of the present invention, it is preferable that the weight percentage of the powder in the cellulose composite particles is 0.1 to 20% by weight.

[0013] The present invention provides a method for producing cellulose composite particles, comprising the steps of: dry blending a powder containing a cellulosic substance and a powder; and mechanochemical treatment.

[0014] The method for producing cellulose composite particles preferably further includes a step of mechanically grinding the powder. [Effects of the Invention]

[0015] Cosmetics containing the cellulose composite particles of the present invention have a good skin feel, resulting in good texture, moisturizing effect, slipperiness, adhesion, and softness after use. Reflecting these characteristics, makeup can be prevented from rubbing against the skin or smudging due to perspiration after application. Furthermore, when incorporated into cosmetics, the cellulose composite particles become lipophilic, improving their affinity with the oils used in the cosmetics and further enhancing the shelf life of the cosmetics. [Modes for carrying out the invention]

[0016] [Cellulose composite particles] The cellulose composite particles of the present invention are cellulose composite particles containing a cellulosic substance, having an average particle diameter of 1 to 100 μm, and in a shear test based on JIS-Z8835, the shear adhesion force C30 (hereinafter sometimes simply referred to as C30) of the powder layer at a vertical pressure of 30 kPa is greater than 0 kPa and 5 kPa or less, and the value obtained by dividing the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa by the shear adhesion force C10 (hereinafter sometimes simply referred to as C10) of the powder layer at a vertical pressure of 10 kPa (C30 / C10) (hereinafter sometimes simply referred to as C30 / C10) is 4.0 or less.

[0017] If the average particle size of the cellulose composite particles is less than 1 μm, the slipperiness and smoothness are poor. On the other hand, if it is greater than 100 μm, it feels rough and the smoothness is poor. The average particle size of the cellulose composite particles is preferably 1 to 50 μm, more preferably 1 to 40 μm, even more preferably 1 to 30 μm, and particularly preferably 1 to 20 μm. The method for measuring the average particle size of the cellulose composite particles is the same as the method used in the examples.

[0018] Shear adhesion indicates the degree of adhesion between powder particles; a higher shear adhesion value means stronger adhesion. C30 indicates the degree of adhesion between powder particles when the powder layer is compressed at 30 kPa. If the C30 pressure is greater than 5 kPa, the adhesion is strong and the lubricity is poor under pressure. The C30 pressure is preferably greater than 0 kPa and 4 kPa or less, more preferably greater than 0 kPa and 3 kPa or less, and even more preferably greater than 0 kPa and 2 kPa or less.

[0019] C10 indicates the adhesion between powder particles when the powder layer is compressed at 10 kPa. A large difference between C10 and C30 means that the powder is highly susceptible to pressure. If the C30 / C10 ratio is greater than 4, a squeaky feeling is felt, and the texture is inferior. Preferably, the C30 / C10 ratio is greater than 0 and 3 or less, more preferably greater than 0 and 2.5 or less, even more preferably greater than 0 and 2 or less, and particularly preferably greater than 0 and 1.5 or less. The method for measuring C30 and C10 is the same as the method used in the examples. The cellulose composite particles having the above average particle diameter, with C30 being more than 0 KPa and 5 KPa or less, and C30 / C10 being more than 0 and 4 or less, when the powder is applied on the skin, feel an appropriate moist feeling, slipperiness, and softness on the skin, have little crunchiness, and are excellent in skin feeling.

[0020] The circularity of the cellulose composite particles of the present invention is not particularly limited, but is preferably 0.4 to 1.0. If the circularity is less than 0.4, the shape may be irregular, the flatness may be too high, and the slipperiness on the skin may be inferior. The circularity of the cellulose composite particles is more preferably 0.5 to 1.0, still more preferably 0.55 to 1.0, and particularly preferably 0.6 to 1.0. The method for measuring the circularity of the cellulose composite particles is the method measured in the examples. The shape of the cellulose composite particles is not particularly limited, and examples include granular, spherical, elliptical, rounded,块状, scaly, plate-like, fibrous, flat, bowl-shaped, convex or concave lens-shaped, etc. Among them, in terms of excellent slipperiness, spherical, elliptical, rounded, and convex lens-shaped are preferable.

[0021] The oil absorption amount of the cellulose composite particles of the present invention is not particularly limited, but is preferably 10 to 200 ml / 100 g in terms of achieving the effects of the present application. If the oil absorption amount is outside the above range, the skin feeling may be inferior. The lower limit of the oil absorption amount of the cellulose composite particles is 10 ml / 100 g, particularly preferably 20 ml / 100 g. On the other hand, the upper limit of the oil absorption amount of the cellulose composite particles is more preferably 180 ml / 100 g, still more preferably 160 ml / 100 g, particularly preferably 140 ml / 100 g, and most preferably 120 ml / 100 g. The method for measuring the oil absorption amount of the cellulose composite particles is the method measured in the examples.

[0022] (Cellulose-based substance) The cellulose composite particles of the present invention essentially contain a cellulose-based substance. Cellulosic substances are substances that essentially contain cellulose, and it is preferable that they contain 50 to 100% by weight of cellulose. The cellulose content in the cellulosic substance is more preferably 60 to 100% by weight, even more preferably 70 to 100% by weight, particularly preferably 80 to 100% by weight, and most preferably 90 to 100% by weight. Cellulose can include natural cellulose derived from wood, cotton, hemp, bamboo, etc., as well as regenerated or refined cellulose and cellulose esters. These cellulose raw materials can be finely powdered by crushing or cutting. For crushing, for example, ball mills, vibratory mills, cutter mills, hammer mills, whey mills, jet mills, extruders, and mortar mills can be used. Among the above celluloses, fibrous or powdered cellulose derived from wood pulp is preferred. Alternatively, cellulose obtained by further micronizing a water slurry of kraft pulp using a Dyno-Mill or similar device, or commercially available nanocellulose granulated by spray drying or similar methods may also be used. Furthermore, regenerated cellulose obtained by dissolving cellulose raw materials may also be used. For example, a method may be used in which viscose is dropped in granular form into a coagulation regeneration bath to perform coagulation regeneration and obtain cellulose particles. The cellulose described above may be modified with carboxyl groups, phosphate groups, amino groups, etc. The cellulose ester may be one or more selected from the group consisting of cellulose organic acid esters and cellulose phosphate esters. For example, one or more selected from cellulose acetate, cellulose propionate, cellulose acetate propionate, cellulose butyrate, and cellulose acetate butyrate may be used.

[0023] Cellulosic substances may contain, in addition to cellulose, at least one selected from surfactants, organic substances, and inorganic substances.

[0024] There are no particular limitations on the surfactants, but examples include anionic surfactants such as fatty acid salts, alkyl sulfate salts, alkyl ether carboxylates, alkyl ether sulfate salts, alkyl phosphate salts, polyoxyalkylene alkyl ether acetates, alkylbenzene sulfonates, polyoxyalkylene alkyl ether sulfates, higher fatty acid amide sulfonates, higher fatty acid alkali metal salts, alkyl phosphates, polyoxyalkylene alkyl ether phosphate salts, long-chain sulfosuccinates, and N-acyl amino acid salts; cationic surfactants such as quaternary ammonium salts and alkylamine salts; polyoxyalkylene oxide-added alkyl ethers, polyoxyalkylene styrene-added phenyl ethers, polyhydric alcohols, and monohydric lipids. Nonionic surfactants such as ester compounds with fatty acids, polyoxyalkylene alkylphenyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, glycerin fatty acid esters, PEG-hydrogenated castor oil, polyoxyalkylene castor oil, polyoxyalkylene hydrogenated castor oil, higher fatty acid PEG glyceryls, higher fatty acid sorbitans, polyoxyalkylene sorbitol fatty acid esters, polyglycerin fatty acid esters, alkylglycerin ethers, polyoxyalkylene cholesteryl ethers, alkyl polyglucosides, sucrose fatty acid esters, and polysorbates; amphoteric surfactants such as amino acid-based, betaine-type, hydrogenated lecithin, and lecithin; and silicone-based surfactants such as dimethicone. The above surfactants may be used individually or in combination of two or more.

[0025] The organic substances are not particularly limited, but examples include waxes such as carnauba wax, candelilla wax, higher alcohols, higher fatty acids, synthetic waxes, and paraffin; and oils such as almond oil, olive oil, rice bran oil, squalane, silicone oil, mineral oil, and alkyl benzoate. The above organic substances may be used individually or in combination of two or more.

[0026] While there are no particular limitations on the inorganic substances used, examples include warlastenite, sericite, kaolin, mica, clay, talc, bentonite, aluminasilicate, pyrophyllite, montmorillonite, calcium silicate, calcium carbonate, magnesium carbonate, dolomite, calcium sulfate, boron nitride, silicon carbide, silica, alumina, mica, titanium dioxide, zinc oxide, magnesium oxide, hydrosaltite, etc. One or more of the above inorganic substances may be used in combination.

[0027] If a cellulosic substance contains at least one selected from surfactants, organic substances, and inorganic substances, then at least one selected from surfactants, organic substances, and inorganic substances can be mixed into the cellulosic substance when crushing and / or granulating the cellulose.

[0028] (powder) In order for the cellulose composite particles of the present invention to achieve the effects of this invention, it is necessary that they contain the above-mentioned cellulosic material and powder. Furthermore, it is preferable that the powder is attached to the surface of the cellulosic material in the cellulose composite particles.

[0029] The powder preferably has an alkyl group having 2 to 30 carbon atoms and / or two or more methyl groups, in order to achieve the effects of the present invention. The alkyl group having 2 to 30 carbon atoms may have a linear structure or a branched structure. The number of carbon atoms in the alkyl group is preferably 2 to 25, more preferably 2 to 20, and even more preferably 2 to 15.

[0030] The powders are not particularly limited, but include hydrophobic silicas such as dimethylsilylated silica, trimethylsilylated silica, octylsilylated silica, and dimethylpolysiloxane-modified silica; fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, behenic acid, montanic acid, and cerotic acid; calcium laurate, zinc laurate, potassium laurate, zinc myristate, sodium myristate, magnesium myristate, zinc palmitate, sodium stearate, magnesium stearate, zinc stearate, calcium stearate, aluminum stearate, calcium 12-hydroxystearate, zinc 12-hydroxystearate, magnesium 12-hydroxystearate, calcium behenate, zinc behenate, magnesium behenate, calcium montanate, zinc montanate, magnesium montanate, and montanic acid. Aluminum and other fatty acid metal salts; palmitate glyceride, myricyl cerotate, myricyl palmitate, cetyl palmitate and other waxes; N-coconut oil fatty acid acyl-L-glutamate sodium, N-lauroyl-L-glutamate sodium, N-myristoyl-L-glutamate potassium, N-myristoyl-L-glutamate sodium, N-acyl-L-glutamate sodium, N-stearoyl-L-glutamate sodium, N-lauroyl- Examples include amino acid-based substances such as L-glutamic acid, N-stearoyl-L-glutamic acid, N-lauroyl-L-arginine, N-lauroyl-L-lysine, N-hexanoyl-L-lysine, N-oleylyl-L-lysine, N-palmitoyl-L-lysine, N-stearoyl-L-lysine, N-hexanoyl-L-lysine, N-myristoyl-L-lysine, N-capryloyl-L-lysine, and N-decanoyl-L-lysine; and complex lipids such as phospholipids and glycolipids. The above powders may be used individually or in combination of two or more. Furthermore, mica or synthetic fluorphlogopite will not be used as the powder.

[0031] The powder preferably has at least one functional group selected from a hydroxyl group, a primary to tertiary amino group, a carboxyl group, a carboxylic acid base, a phosphate group, a phosphate base, a phosphorylcholine group, a sulfonic acid base, and a silyl group, and more preferably has two or more functional groups selected from the above functional groups.

[0032] The powder is preferably one having an alkyl group with 2 to 30 carbon atoms and / or two or more methyl groups, and further having the above-mentioned functional group, in order to achieve the effects of the present invention. Among the above powders, fatty acid-based substances and amino acid-based substances are preferred, and magnesium stearate, magnesium myristate, and N-lauroyl-L-lysine are particularly preferred.

[0033] The powder content in the cellulose composite particles is not particularly limited, but is preferably 0.1 to 20% by weight. If the powder content is outside this range, the effects of the present invention may not be fully obtained. The lower limit of the powder content in the cellulose composite particles is more preferably 1% by weight, even more preferably 3% by weight, and particularly preferably 4% by weight. On the other hand, the upper limit of the powder content in the cellulose composite particles is more preferably 15% by weight, even more preferably 12% by weight, and particularly preferably 10% by weight.

[0034] It is preferable that the cellulose composite particles satisfy the following condition 1 regarding their buoyancy in water, as this may improve the slipperiness between the powder particles.

[0035] Condition 1: After shaking a 5% aqueous dispersion of cellulose composite particles and allowing it to stand at 25°C for 12 hours, the proportion of floating material that rises to the surface at the water-air interface is 5 to 100% by weight relative to 100% by weight of the cellulose composite particles contained in the 5% aqueous dispersion.

[0036] The amount of floating material is more preferably 10 to 100% by weight, and even more preferably 20 to 100% by weight. The proportion of floating material was determined by the method described in the examples.

[0037] [Method for producing cellulose composite particles] The method for producing the cellulose composite particles of the present invention may use any conventionally known method as long as it can produce the above-mentioned cellulose composite particles. Examples include a wet method using a solvent, a dry method performed in the gas phase, and a mechanochemical method involving mechanical mixing, grinding, or shearing. In particular, a method of production by dry blending using a dry method performed in the gas phase or a mechanochemical method involving mixing, grinding, or shearing is preferred in order to achieve the effects of the present invention. It is even more preferable to include a step of dry blending a powder containing a cellulose-based substance and a powder, and a step of mechanochemical treatment. Furthermore, it is preferable to further include a step of mechanically crushing the powder.

[0038] Examples of apparatus for producing the cellulose composite particles of the present invention include Henschel mixers, Reidige mixers, kneaders, ball mills, bead mills, vibratory mills, cutter mills, hammer mills, Wiley mills, jet mills, extruders, and mortar mills. In terms of mechanochemical treatment conditions, it is particularly preferable to use a mill that uses non-reactive balls or rods such as ceramics or metals as the treatment medium. The detailed grinding conditions are not particularly limited, but the grinding conditions should be adjusted to obtain cellulose composite particles that satisfy the conditions of the present invention.

[0039] In a method for producing cellulose composite particles, if the method includes a step of mechanochemically treating a powder containing a cellulose-based substance and powder, the average particle size of the cellulose-based substance used is preferably 1 to 100 μm, more preferably 1 to 50 μm, even more preferably 1 to 40 μm, and most preferably 1 to 30 μm. Furthermore, the powder used preferably has an average particle size of 1 nm to 500 μm, more preferably 1 nm to 300 μm, even more preferably 1 nm to 200 μm, and most preferably 1 nm to 100 μm. The powder is preferable in that it is ground to 1 μm or less in the process of producing cellulose composite particles, as this produces the effects of the present invention.

[0040] The cellulose composite particles of the present invention have excellent skin feel and are therefore suitable for use in cosmetics. When used in cosmetics, they can be used in combination with known cosmetic ingredients according to conventional methods. Examples of cosmetic ingredients include oils, surfactants, alcohols, water, humectants, gelling agents, thickeners, powders other than the cellulose composite particles of the present invention, UV absorbers, preservatives, antibacterial agents, antioxidants, and functional ingredients. The forms of cosmetics containing the cellulose composite particles of the present invention include powder, solid, cream, gel, liquid, mousse, and spray. The amount of the cellulose composite particles of the present invention incorporated into the cosmetic composition is not particularly limited, but is preferably 0.1 to 50% by weight, more preferably 0.5 to 30% by weight, and even more preferably 1 to 20% by weight. [Examples]

[0041] The following describes specific examples of the cellulose composite particles of the present invention. However, the present invention is not limited to these examples. Furthermore, the physical properties of the cellulose composite particles in the examples and comparative examples were evaluated in the manner described below.

[0042] [Average particle diameter] A laser diffraction particle size distribution analyzer (Mastersizer 3000, Malvern) was used as the measurement device, and measurements were taken using the dry method. The average particle size was determined using the D50 value obtained by volume-based measurement.

[0043] [Evaluation of shear adhesion] Measurements were taken using a powder bed shear force measuring device, model NS-S500 (manufactured by NanoSeeds Co., Ltd.), in accordance with JIS-Z8835 (Method for measuring the critical state line (CSL) and wall collapse line (WYL) by a single-surface shear test). The measurement samples (powder) used had a moisture content of 10% or less. The moisture content was measured using an infrared moisture meter. The collapse behavior of the powder layer was measured at vertical pressures of 30 kPa and 10 kPa, and the shear adhesion force C30 of the powder layer at 30 kPa and C10 of the powder layer at 10 kPa were determined. Furthermore, the value obtained by dividing C30 by C10 (C30 / C10) was calculated from the obtained C30 and C10.

[0044] [Measurement of circularity] The measurements were performed using an image analysis method with a particle analysis imaging device (Mofologi G3, Malvern).

[0045] [Measurement of oil absorption] The measurement was performed using oleic acid as the oil, based on the JIS-K5101 method for measuring oil absorption.

[0046] [Evaluation of buoyancy in water] 10 g of cellulose composite particles and 200 g of water were placed in a 500 ml separatory funnel and shaken 20 times. After standing at 25°C for 12 hours, the lower layer (aqueous dispersion) was removed from the bottom, and the floating material that had risen to the water-air interface was removed from the top. 200 g of water was added to the funnel, and the above procedure was repeated. The floating material was dried at 80°C until the moisture content was 10% or less, and its weight was measured after drying. The proportion of floating material that rose to the water-air interface was calculated using the following formula (1). Percentage of floating material = (Dried weight of the upper separated layer / 10g) × 100 (%) (1) The moisture content of the cellulose composite particles was measured using an infrared moisture meter.

[0047] [Skin sensation evaluation] According to the present invention, the feel after use is excellent in terms of moistness, slipperiness, adhesion, and softness. Reflecting these characteristics, it can prevent makeup from rubbing against the skin and smudging due to perspiration after applying makeup. Ten panelists evaluated the feel of various powders applied to the skin on a scale of 1 to 5, evaluating four aspects: moistness, slipperiness, adhesion, and softness. A score of 1 was the worst, and 5 was the best. The average score of all panelists in the sensory evaluation test is shown. The feeling of tightness after applying makeup, skin friction, and makeup breakdown due to sweating were also evaluated on a 1-5 scale. For these evaluations, the cosmetics used were those with the cellulose composite particles from the examples or the untreated cellulose particles from the comparative examples, as shown in Table 1. The evaluation criteria for each evaluation item were as follows: Moisture level: The higher the number, the more moisturizing the product feels. Slipperiness: A higher value indicates better slipperiness. Adhesion: A higher value indicates greater adhesion to the skin. Softness: The higher the value, the softer the feeling. Squeakiness: The higher the value, the less squeaky you feel. Skin friction: The higher the value, the less skin friction you feel. Makeup breakdown: A higher number indicates that you feel your makeup hasn't broken down. For each item, the average of each panelist's evaluation results was calculated, and a higher average value indicated superior tactile sensation. Additionally, the average of the results for all four items was calculated, and a higher average value indicated a powder with a well-balanced tactile sensation.

[0048] [Comparative Example 1] CELLULOBEADS D-5 (manufactured by Daito Chemical Industries, Ltd.) was used as Comparative Example 1 for the cellulose-based material. The average particle size was 8.0 μm, C30 was 3.4 kPa, and C30 / C10 was 4.5. The circularity was 0.97, the oil absorption was 55 ml / 100 g, and the amount of floating matter in water was 0%. In the skin sensation evaluation, the moistness was 2, the slipperiness was 3.6, the adhesion was 2.4, and the softness was 2. While the slipperiness was a relatively good result, the values ​​for the other evaluation items were low, resulting in a poor skin sensation. The overall balance result for each evaluation item was 2.5, indicating a poor balance as a powdery texture.

[0049] [Example 1] 20 g of CELLULOBEADS D-5 from Comparative Example 1 and 2 g of magnesium stearate particles (average particle size 11.0 μm) were mixed in a Henschel mixer for 20 minutes, and the mixed particles were pulverized in a hammer mill. These composite particles were heat-treated at 115°C for 6 hours to obtain cellulose composite particle 1 of Example 1. The average particle size of the obtained cellulose composite particles 1 was 8.5 μm, the C30 was 1.5 kPa, and the C30 / C10 ratio was 1.6. The circularity was 0.95, the oil absorption was 30 ml / 100 g, and the amount of floating particles relative to water was 30%. In the skin sensation evaluation, the moistness was 4.3, the slipperiness 4.1, the adhesion 4.2, and the softness 4.3. All evaluations showed high values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.2, indicating excellent balance as a powder texture.

[0050] [Example 2] 20 g of CELLULOBEADS D-5 from Comparative Example 1 and 2 g of magnesium stearate particles (average particle size 11.0 μm) were mixed in a Henschel mixer for 20 minutes, and then dry-mixed for 10 minutes with 5 mm diameter beads in a media stirring mill. The resulting composite particles were pulverized in a hammer mill. These composite particles were heat-treated at 115°C for 6 hours to obtain cellulose composite particles 2 of Example 2. The average particle size of the obtained cellulose composite particles 2 was 8.5 μm, the C30 was 1.6 kPa, and the C30 / C10 ratio was 1.7. The circularity was 0.95, the oil absorption was 28 ml / 100 g, and the amount of floating particles relative to water was 35%. In the skin sensation evaluation, the results were: moistness 4.5, slipperiness 4.3, adhesion 4.4, and softness 4.5. All evaluations showed high values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.4, indicating excellent balance as a powder texture.

[0051] [Example 3] 20g of CELLULOBEADS D-5 from Comparative Example 1 and 2g of N-lauroyl-L-lysine (manufactured by Ajinomoto Healthy Supply Co., Ltd., average particle size 18.0μm) were mixed in a Henschel mixer for 20 minutes, and then dry-mixed for 10 minutes with 5mm diameter beads in a media stirring mill. The resulting composite particles were pulverized in a hammer mill. These composite particles were heat-treated at 115°C for 6 hours to obtain cellulose composite particles 3 of Example 3. The average particle size of the obtained cellulose composite particles 3 was 8.6 μm, the C30 was 1.4 kPa, and the C30 / C10 ratio was 1.6. The circularity was 0.95, the oil absorption was 33 ml / 100 g, and the amount of floating matter relative to water was 38%. In the skin sensation evaluation, the moistness was 4.5, the slipperiness 4.3, the adhesion 4.4, and the softness 4.5. All evaluations showed high values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.4, indicating excellent balance as a powder texture.

[0052] [Comparative Example 2] CELLULOBEADS D-10 (manufactured by Daito Chemical Industries, Ltd.) was used as Comparative Example 2, representing a cellulose-based substance. The average particle size was 13.0 μm, C30 was 3.5 kPa, and C30 / C10 was 4.8. The circularity was 0.98, the oil absorption was 50 ml / 100 g, and the amount of floating matter in water was 0%. In the skin sensation evaluation, the moistness was 3, the slipperiness was 3.9, the adhesion was 2.8, and the softness was 3. While the slipperiness was a relatively good result, the values ​​for the other evaluation items were low, resulting in a poor skin sensation. The overall balance result for each evaluation item was 3.2, indicating a poor balance in terms of powderiness.

[0053] [Example 4] Cellulose composite particles 4 of Example 4 were obtained by following the same procedure as in Example 1, except that CELLULOBEADS D-10 was used instead of CELLULOBEADS D-5. The average particle size of the obtained cellulose composite particles 4 was 13.5 μm, the C30 was 1.7 kPa, and the C30 / C10 ratio was 2.0. The circularity was 0.98, the oil absorption was 28 ml / 100 g, and the amount of floating particles relative to water was 30%. In the skin sensation evaluation, the moistness was 4.0, the slipperiness 4.4, the adhesion 4.5, and the softness 4.0. All evaluations showed high values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.2, indicating excellent balance as a powder.

[0054] [Example 5] The procedure was carried out in the same manner as in Example 2, except that CELLULOBEADS D-10 was used instead of CELLULOBEADS D-5, to obtain cellulose composite particles 5 of Example 5. The average particle size of the obtained cellulose composite particles 5 was 13.5 μm, the C30 was 1.7 kPa, and the C30 / C10 ratio was 2.0. The circularity was 0.98, the oil absorption was 28 ml / 100 g, and the amount of floating particles relative to water was 30%. In the skin sensation evaluation, the moistness was 4.1, the slipperiness 4.5, the adhesion 4.6, and the softness 4.1. All evaluations showed high values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.3, indicating excellent balance as a powder texture.

[0055] [Example 6] The procedure was carried out in the same manner as in Example 3, except that CELLULOBEADS D-10 was used instead of CELLULOBEADS D-5, to obtain cellulose composite particles 6 of Example 6. The average particle size of the obtained cellulose composite particles 6 was 13.7 μm, the C30 was 1.8 kPa, and the C30 / C10 ratio was 2.1. The circularity was 0.96, the oil absorption was 33 ml / 100 g, and the amount of floating particles relative to water was 33%. In the skin sensation evaluation, the moistness was 4.3, the slipperiness 4.5, the adhesion 4.6, and the softness 4.2. All evaluations showed high numerical values, indicating excellent skin sensation. The overall balance result for each evaluation item was 4.4, indicating excellent balance as a powder texture.

[0056] [Examples 7-12, Comparative Examples 3 and 4] The cellulose powders of Examples 1-6 and Comparative Examples 1 and 2 were incorporated into cosmetic compositions to obtain the cosmetic compositions of Examples 7-12 and Comparative Examples 3 and 4 shown in Table 1 below. Even when incorporated into these cosmetic compositions, the powders exhibited the same effects as those of the individual powders described above, and furthermore, they exhibited excellent effects such as no squeaky feeling, no skin rubbing, and no makeup breakdown.

[0057] [Table 1]

[0058] (Note 1): MAKIBASE SEB (manufactured by Daito Kasei Kogyo Co., Ltd.) (Note 2): MAKIGREEN D10 (manufactured by Daito Chemical Industries Co., Ltd.) (Note 3): PGQ TiO2R250 (manufactured by Daito Chemical Industries, Ltd.) (Note 4): PGQ YELLOW No.602P (manufactured by Daito Chemical Industries, Ltd.) (Note 5): PGQ RED No.211P (manufactured by Daito Kasei Kogyo Co., Ltd.) (Note 6): PGQ BLACK No.710P (manufactured by Daito Kasei Kogyo Co., Ltd.) (Note 7): S-STM MICA SY20 (manufactured by Daito Chemical Industries Co., Ltd.) (Note 8): CELLULOBEADS D-10 (manufactured by Daito Kasei Kogyo Co., Ltd.)

Claims

1. Cellulose composite particles containing cellulose-based material and powder, The powder is attached to the surface of the cellulose-based material, The weight percentage of the powder in the cellulose composite particles is 0.1 to 20% by weight, and the powder is at least one selected from hydrophobic silica, fatty acids, fatty acid metal salts, amino acid-based substances, and composite lipids. The average particle size is 1 to 100 μm. In a shear test based on JIS-Z8835, the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa is greater than 0 kPa and less than or equal to 5 kPa. Furthermore, the value obtained by dividing the shear adhesion force C30 of the powder layer at a vertical pressure of 30 kPa by the shear adhesion force C10 of the powder layer at a vertical pressure of 10 kPa in the shear test (C30 / C10) is greater than 0 and less than or equal to 4. Cellulose composite particles.

2. The cellulose composite particle according to claim 1, wherein the circularity measured by image analysis is 0.4 to 1.

0.

3. Cellulose composite particles according to claim 1 or 2, wherein the oil absorption capacity is 10 to 200 ml / 100 g.

4. A method for producing cellulose composite particles according to any one of claims 1 to 3, A method for producing cellulose composite particles, comprising the steps of dry blending a powder containing the cellulose-based substance and the powder, and mechanochemical treatment.

5. A method for producing cellulose composite particles according to claim 4, further comprising the step of mechanically grinding the powder.

Images