Cosmetic

Abstract

To provide a cosmetic that contains polyamide particles, possessing marine biodegradability and allowing mass production, by taking into account recent global environmental issues and regulatory movements emphasizing the development of marine biodegradable polyamide fine particles and mass production of products utilizing them as important research subjects.SOLUTION: A cosmetic comprises polyamide fine particles composed of polyamide 4, an oil component composed of an ester compound or a vegetable oil, a pigment, and a filler.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic containing polyamide particles. [Background technology]

[0002] Polyamide microparticles have excellent toughness and heat resistance and are therefore used in aircraft, automobiles, cosmetics, etc. In cosmetics, polyamide microparticles are used in cosmetics such as powder foundations because of their soft feel and excellent slipperiness.

[0003] For example, spherical polyamide 12 microparticles are widely used, but there is a growing movement to restrict the use of microplastics. Under these circumstances, marine biodegradable plastics, which can be decomposed into substances found in nature by the action of microorganisms, are attracting attention. Polyamide microparticles are also required to be marine biodegradable, and rapid development is underway to obtain such polyamide microparticles.

[0004] For example, Patent Document 1 discloses marine biodegradable polyamide 4 microparticles with a smooth surface and a sphericity of 95.

[0005] Furthermore, Patent Document 2 discloses marine biodegradable polyamide fine particles with a sphericity of 96 or more. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2020 / 095702 [Patent Document 2] International Publication No. 2022 / 113993 Summary of the Invention [Problem to be solved by the invention]

[0007] In light of recent international environmental issues and regulatory trends, the development of marine biodegradable polyamide microparticles and the mass production of products using these microparticles have become important research themes.

[0008] Therefore, an object of the present invention is to provide a cosmetic containing polyamide particles that are marine biodegradable and can be mass-produced. [Means for solving the problem]

[0009] In order to solve the above problems, the cosmetic of the present invention is characterized by containing polyamide microparticles made of polyamide 4, an oil component made of an ester compound or vegetable oil, a pigment, and a filler.

[0010] In the cosmetic composition according to the present invention, the oil component may contain the ester-based compound and the silicone-based compound.

[0011] The cosmetic preparation according to the present invention may further contain water.

[0012] The cosmetic according to the present invention may be configured so that the oil component contains a vegetable oil, and in this case, may be configured to further contain a vegetable extract component and / or an ultraviolet absorber. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a cosmetic that has a composition that places little burden on the environment and can be produced industrially. DETAILED DESCRIPTION OF THE INVENTION

[0014] The cosmetic of the present invention contains polyamide microparticles made of at least polyamide 4, an oil component made of an ester compound or vegetable oil, a pigment, and a filler.

[0015] (1) Polyamide microparticles Examples of polyamide microparticles made of polyamide 4 include the polyamide microparticles described in Patent Document 1 (WO 2020 / 095702) and the polyamide microparticles described in Patent Document 2 (WO 2022 / 113993). The blending amount of the polyamide microparticles is preferably 0.1 to 30 wt %, and more preferably 2 to 15 wt %, of the total cosmetic.

[0016] The polyamide microparticles described in Patent Document 1 are made of polyamide 4, have a number average particle size of 0.1 to 300 μm, a particle size distribution index of 3.0 or less, a sphericity of 90 or more, and a linseed oil absorption of 100 mL / 100 g or less.

[0017] The polyamide microparticles described in Patent Document 2 are made of a 2-pyrrolidone / caprolactone copolymer, and have a ratio (r / A) of the proportion of voids on the particle surface, r, to the BET specific surface area, A, of the specific surface area of ​​the particle surface measured by the BET method, of 6.0 or more and 100.0 or less, or have a sphericity of 96 or more.

[0018] [Number average particle diameter] The number-average particle diameter of the polyamide fine particles is preferably in the range of 0.1 to 300 μm. If the number-average particle diameter exceeds 300 μm, the surface of the coating film made from the particles will be non-uniform. The number-average particle diameter of the polyamide fine particles is preferably 200 μm or less, more preferably 100 μm or less, even more preferably 50 μm or less, and particularly preferably 30 μm or less. If the number-average particle diameter is less than 0.1 μm, aggregation of the particles will occur. The number-average particle diameter of the polyamide fine particles is preferably 0.3 μm or more, more preferably 0.7 μm or more, even more preferably 1 μm or more, particularly preferably 2 μm or more, and most preferably 3 μm or more.

[0019] [Particle size distribution index] The particle size distribution index, which indicates the particle size distribution of polyamide microparticles, is preferably 3.0 or less. A particle size distribution index exceeding 3.0 results in poor fluidity in paint and cosmetic applications, impairing the uniformity of the coating surface. The particle size distribution index is preferably 2.0 or less, more preferably 1.5 or less, even more preferably 1.3 or less, and particularly preferably 1.2 or less. Theoretically, the lower limit is 1. The number-average particle size of polyamide microparticles can be calculated by randomly selecting 100 particle diameters from a scanning electron microscope photograph and calculating the arithmetic mean. If the particle diameter is not perfectly circular, e.g., elliptical, in the photograph, the maximum diameter of the particle is taken as the particle diameter. To accurately measure particle size, measurements should be made at a magnification of at least 1,000x, preferably 5,000x or more. The particle size distribution index is determined from the particle diameter value obtained above using the following numerical conversion formula:

[0020]

number

[0021] Here, Di is the particle diameter of each particle, n is the number of measurements (100), Dn is the number average particle diameter, Dv is the volume average particle diameter, and PDI is the particle diameter distribution index.

[0022] [Sphericity] The sphericity of the polyamide microparticles, which indicates the sphericity, is preferably 90 or more. If the sphericity is less than 90, the polyamide microparticles will not be able to provide a smooth feel when used in cosmetics or paints. The sphericity is preferably 92 or more, more preferably 95 or more, even more preferably 97 or more, and particularly preferably 98 or more. The upper limit is 100.

[0023] The sphericity of the polyamide fine particles is determined by observing 30 particles randomly selected from a scanning electron microscope photograph and determining the sphericity from the minor axis and major axis according to the following formula.

[0024]

number

[0025] Here, S is sphericity, a is major axis, b is minor axis, and n is the number of measurements (30).

[0026] [Linseed oil absorption] The solidity and surface smoothness of polyamide microparticles can be expressed by the amount of linseed oil absorbed by the polyamide microparticles. Specifically, the smoother the surface, the less pores present in the microparticles, resulting in a lower linseed oil absorption, which indicates the amount of linseed oil absorbed. Furthermore, the more solid the microparticles, for example, hollow particles, are, the less linseed oil they can support internally, resulting in a lower oil absorption. The linseed oil absorption of the polyamide microparticles of the present invention is 100 mL / 100 g or less. If the linseed oil absorption of the polyamide microparticles exceeds 100 mL / 100 g, the particles will become hollow or porous, failing to provide good fluidity to cosmetics or paints. The linseed oil absorption of the polyamide microparticles is preferably 90 mL / 100 g or less, more preferably 80 mL / 100 g or less, even more preferably 70 mL / 100 g or less, and particularly preferably 60 mL / 100 g or less. The lower limit of the linseed oil absorption is 0 mL / 100 g or more. From the viewpoint of marine biodegradability of the polyamide fine particles, the most preferable range is 10 mL / 100 g or more and 80 mL / 100 g or less.

[0027] The linseed oil absorption is measured in accordance with the Japanese Industrial Standards (JIS) JIS K 5101 (2004) "Pigment Test Method: Refined Linseed Oil Method."

[0028] [BET specific surface area] The surface smoothness of polyamide particles can also be expressed by the BET specific surface area determined by gas adsorption. The smoother the surface, the smaller the BET specific surface area. 2 / g or less, and more preferably 5m 2 / g or less, and more preferably 3m 2 / g or less, and particularly preferably 1m 2 / g or less, and most preferably 0.5m 2 From the viewpoint of marine biodegradability of polyamide microparticles, the2 / g or more 3m 2 / g or less is most preferable.

[0029] The BET specific surface area is measured in accordance with the Japanese Industrial Standards (JIS) JIS R 1626 (1996) "Method for measuring specific surface area by gas adsorption BET method."

[0030] [Theoretical surface area ratio] The solidity of polyamide fine particles can also be evaluated by the following formula, which shows the ratio of the theoretical surface area calculated from the BET specific surface area and the number-average particle diameter: That is, the closer this ratio is to 1, the more adsorption occurs only on the outermost surface of the particle, indicating a smooth surface and solid particle;

[0031]

number

[0032] Here, R is the surface area ratio, Di is the particle diameter of each particle, α is the density of the polyamide, and A is the BET specific surface area.

[0033] [Ratio of void fraction r on particle surface to BET specific surface area A] The ratio (r / A) of the void ratio r on the particle surface of the polyamide microparticles to the BET specific surface area A is 6.0 or more and 100.0 or less. The voids are concave voids on the porous surface of the polyamide microparticles. The void ratio r is, for example, the ratio of the voids on the particle surface to the surface area of ​​the particle in a scanning electron microscope image of the polyamide microparticles taken from any direction. If the ratio (r / A) is less than 6.0, the affinity of the polyamide microparticles with oil decreases, and the dispersion stability of the polyamide microparticles in, for example, linseed oil decreases. As a result, when the polyamide microparticles are incorporated into products such as paints and cosmetics, the dispersibility of the polyamide microparticles decreases, causing performance degradation due to aggregation and sedimentation of the polyamide microparticles, thereby impairing the usability of the product. Furthermore, the larger the ratio (r / A), the more likely the polyamide microparticles are to be marine biodegradable compared to other microparticles with similar BET specific surface areas A. From the viewpoint of lipophilicity and marine biodegradability of the polyamide microparticles, the ratio (r / A) is 6.0 or more, preferably 8.0 or more, more preferably 10.0 or more, and even more preferably 12.0 or more. On the other hand, if the ratio (r / A) exceeds 100.0, it is basically difficult to produce polyamide microparticles. Therefore, the upper limit of the ratio (r / A) is 100.0 or less.

[0034] [Biodegradable] Biodegradability of polyamide microparticles means that they can be decomposed by microorganisms in activated sludge or seawater. Specifically, according to OECD 301F, this means that they are decomposed by 60% or more after 28 days of cultivation. To ensure stable biodegradability in products, 65% or more is more preferable, 70% or more is even more preferable, and 75% or more is especially preferable. The upper limit of biodegradability is 100% or less.

[0035] The biodegradability of polyamide microparticles can also be evaluated by their decomposition in seawater, where biodegradation is more difficult. Specifically, according to ASTM D6691, it is preferable that 60% or more of the microparticles are decomposed within 180 days of cultivation. To ensure stable biodegradability in the product, 65% or more is more preferable, 70% or more is even more preferable, and 75% or more is especially preferable. The upper limit of biodegradability is 100% or less.

[0036] [Weight average molecular weight] The weight-average molecular weight of the polyamide constituting the polyamide microparticles is preferably in the range of 8,000 to 3,000,000. From the viewpoint of preventing deterioration in feel due to aggregation or twisting of the polyamide microparticles when the polyamide microparticles are continuously rubbed, the weight-average molecular weight is more preferably 10,000 or more, even more preferably 15,000 or more, and particularly preferably 20,000 or more. From the viewpoint of providing a soft feel to the touch, the weight-average molecular weight of the polyamide is more preferably 2,000,000 or less, even more preferably 1,000,000 or less.

[0037] The weight average molecular weight of the polyamide constituting the polyamide fine particles refers to the weight average molecular weight measured by gel permeation chromatography using hexafluoroisopropanol as a solvent and converted into polymethyl methacrylate.

[0038] [Crystallization temperature] The crystallization temperature of the polyamide constituting the polyamide microparticles refers to the apex of the exothermic peak that appears when the temperature is raised from 30°C at a rate of 20°C / min in a nitrogen atmosphere to an endothermic peak indicating the melting point of the polyamide, held at that temperature for 1 minute, and then cooled to 30°C at a rate of 20°C / min using the DSC method. After cooling, the temperature is further raised at 20°C / min, and the apex of the endothermic peak is taken as the melting point of the polyamide microparticles.

[0039] Polyamide polymers can be produced using known polymerization methods. Specifically, methods such as the polycondensation reaction of amino acids such as 4-aminobutyric acid and 3-aminopropionic acid, and the ring-opening polymerization of lactams such as 2-pyrrolidone and 2-azetidinone are used. Examples of ring-opening polymerization include ring-opening polymerization by hydrolysis using water and anionic ring-opening polymerization. Examples of anionic ring-opening polymerization include anionic ring-opening polymerization using an initiator such as alkali metals (e.g., sodium and potassium), hydroxides, hydrides, and salts of alkali metals (e.g., sodium hydroxide, potassium hydroxide, sodium hydride, potassium hydride, sodium methoxide, potassium methoxide, sodium ethoxide, potassium ethoxide, sodium t-butoxide, potassium t-butoxide, sodium pyrrolidone, and potassium pyrrolidone), or organometallic compounds (e.g., butyllithium, butylmagnesium). When using anionic ring-opening polymerization to produce polyamides, it is preferable to further add a polymerization promoter to improve yield. As the polymerization accelerator, known accelerators can be used, such as N-acyl-caprolactam, N-acyl-pyrrolidone, and N-acyl-azetidinone. The polymerization may be carried out in a solvent, or bulk polymerization without a solvent. When a solvent is used, the solvent is not particularly limited as long as the polymerization proceeds. Solution polymerization may be carried out in a good solvent for the polyamide, or suspension polymerization may be carried out in a non-solvent for the polyamide.

[0040] [Method of producing polyamide microparticles] The polyamide fine particles used in the present invention can be produced by the production method described in Patent Document 1 as well as the production method described in Patent Document 2 (WO 2022 / 113993) as follows.

[0041] Patent Document 2 describes a method for producing polyamide microparticles using resin (A), which is a polymer or copolymer primarily composed of a repeating structural unit represented by the following chemical formula (1), and resin (B), which is an emulsion-forming resin capable of forming an emulsion with resin (A) in a molten state. The method comprises the following steps: an emulsion-forming step of melt-mixing resin (A) and resin (B) at a melting temperature equal to or higher than their respective melting points to form an emulsion in which particulate resin (A) is dispersed in resin (B); a fixation step of cooling the molten mixture of resins (A) and (B) to a temperature equal to or lower than the crystallization temperature of resin (A) to fix the emulsion; and a recovery step of washing and removing resin (B) with a washing solution that is a non-solvent for resin (A) to recover polyamide microparticles made of resin (A). The method is characterized in that the melt viscosity ratio of resin (A) to resin (B) at 270°C is 4.3 or more and 125.0 or less.

[0042] [ka]

[0043] In chemical formula (1), x is an integer of 2 or more and 3 or less.

[0044] In the above-described production method, the fixation step may include a holding step of holding the temperature of the molten mixture in a temperature range above the crystallization temperature of the resin (A) and below the melting point of the resin (A), and a cooling step of cooling the temperature of the molten mixture after holding in the temperature range to a temperature equal to or lower than the crystallization temperature of the resin (A).

[0045] In the above-described production method, in the holding step, the temperature of the molten mixture may be held within the temperature range for 30 minutes to 10 hours.

[0046] In the above-described manufacturing method, the fixation step may include a holding step of holding the temperature of the molten mixture in a temperature range above the crystallization temperature of the resin (A) and below the melting point of the resin (A) for 1 second to 10 minutes, and a cooling step of cooling the temperature of the molten mixture after holding in the temperature range to a temperature equal to or lower than the crystallization temperature of the resin (A).

[0047] In the above production method, the emulsion-forming step may include a temperature-raising step of raising the temperatures of the resin (A) and the resin (B) from room temperature to the melting temperature.

[0048] In the above production method, the resin (B) may have a melt viscosity at 270° C. of 0.40 Pa·s or more and 5.00 Pa·s or less.

[0049] In the above production method, the resin (B) may be polyethylene glycol.

[0050] In the above production method, in the emulsion formation step, the resin (A) and the resin (B) may be melt-mixed at a melting temperature of not less than 5°C above the melting point of the resin (A) and not more than 280°C.

[0051] Specifically, the method for producing polyamide microparticles is a method for producing polyamide microparticles (P1) using resin (A), which is a polymer or copolymer primarily composed of a repeating structural unit represented by the above-mentioned chemical formula (1), and resin (B), an emulsion-forming resin capable of forming an emulsion with resin (A) in a molten state. This production method includes an emulsion-forming step, a fixation step, and a recovery step. The emulsion-forming step involves melt-mixing resin (A) and resin (B) at a melting temperature equal to or higher than their respective melting points to form an emulsion in which particulate resin (A) is dispersed in resin (B). The fixation step involves cooling the molten mixture containing the emulsion of resin (A) and resin (B) to a temperature equal to or lower than the crystallization temperature of resin (A), thereby fixating the emulsion. The recovery step involves washing and removing resin (B) from the fixed molten mixture with a cleaning solution that is a non-solvent for resin (A), and recovering polyamide microparticles composed of resin (A). In this production method, the melt viscosity ratio at 270° C. between the resin (A) and the resin (B) is 4.3 or more and 125.0 or less.

[0052] <Resin (A)> Resin (A) is a polymer resin used in this production method as one of the raw materials for polyamide microparticles (P1), and more specifically, it is a polymer or copolymer having the structural unit represented by the above chemical formula (1) as the main repeating structural unit.

[0053] In the structural unit of the resin (A), x is 2 or 3. If x is neither 2 nor 3, the polyamide microparticles (P1) made from the resin (A) will not have sufficient marine biodegradability. From the viewpoint of achieving excellent handleability of the polyamide microparticles (P1), x is preferably 3. Furthermore, the resin (A) may contain a crosslinked structure or a branched structure within a range that does not impair the effects of the present invention.

[0054] The melt viscosity of resin (A) at 270°C is not particularly limited, but is preferably 0.02 Pa·s or more and 1.00 Pa·s or less. Resin (A) preferably has a certain degree of viscosity so that it disperses in particulate form in resin (B), which will be described later, to form an emulsion with resin (B). The lower limit of the melt viscosity of such resin (A) at 270°C is preferably 0.02 Pa·s or more, more preferably 0.03 Pa·s or more, and even more preferably 0.04 Pa·s or more. Furthermore, from the viewpoint of preventing the emulsion diameter from becoming too large and maintaining a spherical shape during emulsion formation between resin (A) and resin (B), the upper limit of the melt viscosity of resin (A) at 270°C is preferably 1.00 Pa·s or less, more preferably 0.80 Pa·s or less, even more preferably 0.50 Pa·s or less, and especially preferably 0.30 Pa·s or less.

[0055] The melt viscosity of the resin (A) can be measured using a rheometer. Specifically, the complex viscosity of the resin (A) measured at a temperature of 270°C and a frequency of 1 Hz 5 minutes after the start of measurement can be determined as the melt viscosity of the resin (A).

[0056] The resin (A) used in this manufacturing method can be produced using known polymerization methods. Specifically, resin (A) can be produced by polycondensation of amino acids such as 4-aminobutyric acid and 3-aminopropionic acid, or ring-opening polymerization of lactams such as 2-pyrrolidone and 2-azetidinone. Examples of ring-opening polymerization include ring-opening polymerization by hydrolysis using water and anionic ring-opening polymerization. Examples of anionic ring-opening polymerization include anionic ring-opening polymerization using an initiator such as an alkali metal (e.g., sodium or potassium), hydroxide, hydride, or salt of an alkali metal (e.g., sodium hydroxide, potassium hydroxide, sodium hydride, potassium hydride, sodium methoxide, potassium methoxide, sodium ethoxide, potassium ethoxide, sodium t-butoxide, potassium t-butoxide, sodium pyrrolidone, or potassium pyrrolidone), or an organometallic compound (e.g., butyllithium, butylmagnesium). Resin (A) can be produced by the polycondensation reaction or ring-opening polymerization described above. When anionic ring-opening polymerization is used to produce resin (A), it is preferable to further add a polymerization promoter from the viewpoint of improving yield, etc. Known polymerization promoters can be used, such as N-acyl-caprolactam, N-acyl-pyrrolidone, and N-acyl-azetidinone. The polymerization may be carried out in a solvent, or bulk polymerization without a solvent. When a solvent is used, there are no particular limitations on the solvent as long as the polymerization proceeds. Solution polymerization may be carried out in a good solvent for resin (A), or suspension polymerization may be carried out in a non-solvent for resin (A).

[0057] The copolymerization components of resin (A) are not particularly limited as long as they do not impair the effects of the present invention, and examples thereof include amino acids such as 3-aminopropionic acid, 2-aminopropionic acid, alanine, glycine, and valine, and lactones such as β-propionolactone, γ-butyrolactone, δ-valerolactone, and ε-caprolactone. These are preferred as copolymerization components of resin (A) from the viewpoint of imparting added value such as moisturizing properties when polyamide microparticles (P1) are used in cosmetics without impairing the marine biodegradability of the polyamide microparticles (P1).

[0058] <Resin (B)> Resin (B) is a polymer resin used in this production method together with resin (A) as one of the raw materials for polyamide microparticles (P1). Specifically, it is an emulsion-forming resin that can form a polymer / polymer emulsion with resin (A) in a molten state. A polymer / polymer emulsion is an emulsion in which two types of resins that are incompatible with each other in a molten state are used, with one resin dispersed in the other in the form of spheres. In this production method, the polymer / polymer emulsion is an emulsion in which particulate (spherical) resin (A) is dispersed in resin (B). Such a polymer / polymer emulsion can be formed by satisfying a specific balance between the interfacial tension and melt viscosity of these two types of resins.

[0059] Resin (B) in this production method is not particularly limited as long as it is an emulsion-forming resin that forms a polymer / polymer emulsion with resin (A) in a molten state. Specific examples of such emulsion-forming resins include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polypentamethylene glycol, polyhexamethylene glycol, alkyl ethers in which the hydroxyl groups at one or both ends of these glycols are blocked with methyl, ethyl, propyl, isopropyl, butyl, hexyl, octyl, decyl, dodecyl, hexadecyl, octadecyl, or the like, and alkyl phenyl ethers in which the hydroxyl groups at one or both ends of these glycols are blocked with octylphenyl or the like. In particular, after forming a polymer / polymer emulsion with the resin (A) and removing the resin (B) in the recovery step described below, water can be used as a washing solvent. From the standpoint of economical and, above all, environmental advantages, the resin (B) is preferably one or more selected from the group consisting of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and their alkyl ethers. Furthermore, polyethylene glycol is the most preferred resin (B) because it can form a good polymer / polymer emulsion with the resin (A) in a molten state and the resulting polyamide microparticles (P1) have high sphericity and a small standard deviation of sphericity. Furthermore, two or more of the above-mentioned emulsion-forming resins may be used simultaneously as the resin (B), provided that the effects of the present invention are not impaired.

[0060] In this production method, the melt viscosity of resin (B) at 270°C is preferably 0.40 Pa·s or more and 5.00 Pa·s or less. Resin (B) needs to have an appropriate viscosity in order to form a polymer / polymer emulsion with resin (A) in a molten state. From this perspective, the melt viscosity of resin (B) is preferably 0.40 Pa·s or more and 5.00 Pa·s or less. From the perspectives of preventing the particle size of polyamide microparticles (P1) from becoming too coarse, providing an excellent feel when touched, and reducing the average deviation of the dynamic friction coefficient immediately after the start of measurement, the lower limit of the melt viscosity of resin (B) at 270°C is preferably 0.40 Pa·s or more, more preferably 0.60 Pa·s or more, and even more preferably 0.80 Pa·s or more. Furthermore, from the viewpoints of preventing the particle size of the polyamide microparticles (P1) from becoming too small, suppressing deterioration in the feel of the polyamide microparticles (P1) when touched due to aggregation, etc., and reducing the average deviation of the dynamic friction coefficient over time, the upper limit of the melt viscosity of the resin (B) at 270°C is preferably 5.00 Pa s or less, more preferably 4.00 Pa s or less, even more preferably 3.00 Pa s or less, and particularly preferably 2.00 Pa s or less.

[0061] In this manufacturing method, the melt viscosity ratio between resin (A) and resin (B) at 270°C is 4.3 or more and 125.0 or less. In this manufacturing method, resin (A) and resin (B) form a polymer / polymer emulsion in a molten state, enabling the formation of polyamide microparticles (P1) with excellent surface smoothness, high sphericity, and little sphericity variation. Therefore, the formation of a polymer / polymer emulsion between resin (A) and resin (B) is essential for producing marine biodegradable polyamide microparticles (P1) that exhibit a small average deviation in the dynamic friction coefficient when the microparticles are rubbed together and a small average deviation in the dynamic friction coefficient over time. Although the mechanism behind this is not fully understood, only when resin (A) and resin (B) that satisfy the melt viscosity ratio of 4.3 or more and 125.0 or less are melt-mixed can the balance of the interfacial tension and melt viscosity between these resins (A) and (B) be maintained within a suitable range, resulting in the desired properties of polyamide microparticles (P1).

[0062] If the melt viscosity ratio of resin (A) to resin (B) at 270°C is less than 4.3, the emulsion diameter of resin (A) in resin (B) becomes too large when resins (A) and (B) are in a molten state, which makes it impossible to form a polymer / polymer emulsion of resins (A) and (B).From the viewpoints of improving the smoothness and reducing the feeling of foreign matter when touched by polyamide microparticles (P1) and reducing the average deviation of the dynamic friction coefficient immediately after the start of measurement, the melt viscosity ratio is preferably 10.0 or more, more preferably 15.0 or more, and even more preferably 20.0 or more.

[0063] On the other hand, if the melt viscosity ratio of resin (A) to resin (B) at 270°C exceeds 125.0, the emulsion diameter of resin (A) formed in resin (B) becomes excessively small, and the emulsion of resins (A) and (B) loses stability, making it impossible to obtain polyamide microparticles (P1). From the viewpoints of improving the feel when the polyamide microparticles (P1) are rubbed continuously and reducing the average deviation of the dynamic friction coefficient over time, the melt viscosity ratio is preferably 100.0 or less, more preferably 75.0 or less, even more preferably 50.0 or less, and particularly preferably 40.0 or less.

[0064] The melt viscosity of resin (B) can be measured using a rheometer. Specifically, the complex viscosity of resin (B) measured at 270°C and a frequency of 1 Hz 5 minutes after the start of measurement can be determined as the melt viscosity of resin (B). Furthermore, the melt viscosity ratio of resin (A) to resin (B) at 270°C can be calculated using the determined melt viscosities of resin (A) and resin (B) according to the following formula: Melt viscosity ratio = [Melt viscosity of resin (B)] / [Melt viscosity of resin (A)]

[0065] <Emulsion formation process> As described above, this production method includes an emulsion formation step. This emulsion formation step is a step of melt-mixing the above-described resin (A) and resin (B) at a temperature (melting temperature) equal to or higher than their respective melting points to form a polymer / polymer emulsion of these resins (A) and (B). Hereinafter, the emulsion formation step in this production method will be referred to as the emulsion formation step (ST1).

[0066] The melting temperature in the emulsion-forming step (ST1) is the temperature at which resin (A) and resin (B) are melt-mixed. It is not particularly limited as long as it is equal to or higher than the melting points of resins (A) and (B), and can be selected depending on the type of resin (A). From the viewpoint of producing polyamide microparticles (P1) with higher sphericity and a smaller standard deviation of sphericity, the melting temperature is preferably a temperature equal to or higher than the melting point of resin (A) + 5°C. On the other hand, the upper limit of the melting temperature is preferably 280°C or lower, because this can suppress decomposition of resin (A) melt-mixed with resin (B) and form a stable polymer / polymer emulsion of resins (A) and (B), thereby further enhancing the sphericity of the resulting polyamide microparticles (P1). From the viewpoint of further enhancing the sphericity, the upper limit of the melting temperature is more preferably 270°C or lower. Furthermore, the melt-mixing time of resins (A) and (B) in the emulsion-forming step (ST1) may be approximately 1 minute to 10 hours.

[0067] The melting points of the resins (A) and (B) used in the emulsion formation step (ST1) can be measured using a differential scanning calorimeter (hereinafter sometimes abbreviated as DSC). For example, in a nitrogen atmosphere, the resin (A) is heated from 30°C to the endothermic peak indicating the melting point of the polyamide at a rate of 20°C / min, and then held for 1 minute. After this 1-minute hold, the resin (A) is cooled to 30°C at a rate of 20°C / min, and the resin (A) after this cooling is further heated at 20°C / min. The melting point of the resin (A) can be measured by measuring the apex of the endothermic peak. The melting point of the resin (B) can also be measured in the same manner as the melting point of the resin (A).

[0068] Furthermore, the emulsion-forming step (ST1) preferably includes a temperature-raising step in which the raw materials, resin (A) and resin (B), are heated from room temperature to the melting temperature. Although the detailed mechanism is not yet clear, it is believed that by heating the raw materials, resin (A) and resin (B), from room temperature, a polymer / polymer emulsion of resin (A) and resin (B) with a more uniform and stable shape can be formed. Therefore, from the viewpoints of high sphericity and a small standard deviation of sphericity of the resulting polyamide microparticles (P1), it is preferable that the emulsion-forming step (ST1) includes the temperature-raising step.

[0069] In the emulsion formation step (ST1), the melt mixing ratio of resin (A) to resin (B) can be, for example, 25:75 to 75:25, depending on the mass ratio ((A):(B)) of these resins (A) to (B). If the melt mixing ratio of resin (A) to resin (B) is within the above range, the interfacial tension and melt viscosity of the melt-mixed resins (A) and (B) can be kept in a suitable balance, and a polymer / polymer emulsion of resin (A) and resin (B) can be formed. Therefore, the melt mixing ratio of resin (A) to resin (B) in the emulsion formation step (ST1) is preferably within the above range. From the viewpoint of increasing the sphericity of the resulting polyamide microparticles (P1), the melt mixing ratio is more preferably 30:70 to 75:25, even more preferably 40:60 to 75:25, and even more preferably 50:50 to 75:25.

[0070] Although fine particles can be produced without stirring the molten mixture of resins (A) and (B) in the emulsion-forming step (ST1), stirring the molten mixture may be used to uniformly control the volume average particle size and particle size distribution of the resulting polyamide microparticles (P1). Known stirring devices, such as impellers, melt kneaders, and homogenizers, can be used. Examples of impellers include propellers, paddles, flat blades, turbine blades, cones, anchor blades, screws, and helical blades. The stirring speed depends on the type and melt viscosity of resin (B). However, it is preferably within the range of 0 to 2,000 rpm, even in large-scale equipment, to ensure uniform heat transfer while preventing liquid adhesion to the wall, which can cause changes in the blending ratio. The lower limit of the stirring speed is more preferably 10 rpm or higher, even more preferably 30 rpm or higher, and particularly preferably 50 rpm or higher. The upper limit of the stirring speed is more preferably 1,600 rpm or lower, even more preferably 1,200 rpm or lower, and particularly preferably 800 rpm or lower.

[0071] In this production method, in the emulsion formation step (ST1), additives may be added and melt-mixed to the extent that the effects of the present invention are not impaired. Examples of such additives include surfactants, dispersants, antioxidants, heat stabilizers, weathering agents, lubricants, pigments, dyes, plasticizers, antistatic agents, and flame retardants. Two or more of these may be used.

[0072] The amount of the additives can be selected as appropriate, but is preferably 0.00% by weight or more and 15.00% by weight or less, based on 100.00% by weight of the total of resins (A) and (B). From the viewpoint of fully realizing the effects of the additives, the lower limit of the amount of the additives added is more preferably 0.01% by weight or more, even more preferably 0.05% by weight or more, and particularly preferably 0.10% by weight or more, based on 100.00% by weight of the total of resins (A) and (B). Furthermore, from the viewpoint of reducing the amount of impurities contained in the resulting polyamide microparticles (P1), the upper limit of the amount of the additives added is more preferably 10.00% by weight or less, even more preferably 5.00% by weight or less, even more preferably 3.00% by weight or less, and particularly preferably 1.00% by weight or less, based on 100.00% by weight of the total of resins (A) and (B).

[0073] <Immobilization process> As described above, this production method includes a fixation step. This fixation step is a step in which the molten mixture of resin (A) and resin (B) in the emulsion formation step (ST1) to form a polymer / polymer emulsion is cooled to a temperature below the crystallization temperature of resin (A) to fix the polymer / polymer emulsion (i.e., to a non-flowing state). Hereinafter, the fixation step in this production method will be referred to as fixation step (ST2).

[0074] The method for cooling the molten mixture of resins (A) and (B) in the fixation step (ST2) is not particularly limited as long as it does not impair the effects of the present invention, and examples thereof include a method in which the molten mixture is discharged into a washing solution described below and rapidly cooled in the washing solution, a method in which the molten mixture is mixed and then the washing solution described below is added to a mixing device to rapidly cool the molten mixture, a method in which the molten mixture is air-cooled in a mixing device and then discharged or transferred into a washing solution described below, and a method in which the molten mixture is discharged into the atmosphere and cooled and then transferred to a washing solution described below. The cooling rate of the molten mixture is also not particularly limited as long as it does not impair the effects of the present invention, and may be rapid cooling or natural cooling.

[0075] Furthermore, the fixation step (ST2) preferably includes a holding step in which the temperature of the molten mixture of resin (A) and resin (B) is maintained within a predetermined temperature range, and a cooling step in which the molten mixture is cooled after the holding step. This holding step is a step in which the temperature of the molten mixture (t) is maintained within a temperature range above the crystallization temperature of resin (A) and below the melting point of resin (A) for 1 second to 10 minutes. This cooling step is a step in which the temperature of the molten mixture (t) after being maintained within the above temperature range is cooled to below the crystallization temperature of resin (A). Hereinafter, the holding step and cooling step in this manufacturing method will be referred to as the holding step (ST2-1) and the cooling step (ST2-2), respectively.

[0076] In the fixation step (ST2), the above-mentioned holding step (ST2-1) and cooling step (ST2-2) are carried out in sequence, so that the particulate resin (A) in the polymer / polymer emulsion of resin (A) and resin (B) can be efficiently fixed into spherical shapes with high sphericity and smooth surfaces. In the hold step (ST2-1), the temperature t 混合物 The temperature of the molten mixture is maintained in the above temperature range for 1 second to 10 minutes. 混合物 In the cooling step (ST2-2), the temperature t of the molten mixture after being maintained in the above temperature range in the maintaining step (ST2-1) is maintained at a constant temperature, or may be increased or decreased. 混合物 The temperature-lowering rate and cooling time are set so that the temperature can be lowered to the crystallization temperature of the resin (A) or lower.

[0077] In addition, in the holding step (ST2-1), the temperature t 混合物The holding time for maintaining the temperature in the above temperature range is preferably 1 second or more and 10 minutes or less. This is because, when the upper limit of the holding time is 10 minutes or less, it is easy to sufficiently reduce the proportion of concave voids on the particle surfaces of the resin (A) fixed in particulate form, and polyamide microparticles (P1) with high sphericity and smooth surfaces can be efficiently produced. The upper limit of the holding time is more preferably 5 minutes or less, even more preferably 3 minutes or less, and particularly preferably 1 minute or less. The lower limit of the holding time is determined by the temperature t 混合物 The time is 1 second or more due to operational reasons of the device for maintaining the temperature within the above range.

[0078] <Recovery process> As described above, this production method includes a recovery step. In this recovery step, the molten mixture of resin (A) and resin (B) forming the polymer / polymer emulsion fixed in the fixation step (ST2) is washed with a washing solution that is a non-solvent for resin (A), thereby washing and removing resin (B) from the molten mixture, and recovering polyamide microparticles (P1) made of resin (A). Hereinafter, this recovery step in this production method will be referred to as recovery step (ST3).

[0079] The washing solution used in the recovery step (ST3) is not particularly limited as long as it is a non-solvent for the resin (A) as described above and is a solvent that can dissolve and remove the resin (B). Examples of such washing solutions include alcohols such as methanol, ethanol, and isopropanol, water-soluble ketones such as acetone, and water. From the standpoints of economical and environmental considerations during production, water is most preferably used as the washing solution.

[0080] The washing method in the recovery step (ST3) is not particularly limited as long as it can wash and remove the immobilized resin (B) from the molten mixture. It is sufficient to contact the molten mixture with a washing solution to elute or remove the resin (B) from the molten mixture. For example, this washing method typically involves applying shear or stirring force to the molten mixture, such as reslurry washing. Furthermore, in the recovery step (ST3), the molten mixture may be appropriately heated. The concentration of polyamide microparticles contained in the washing solution used to wash the molten mixture is not particularly limited, but can be exemplified as 0.01% by weight or more and 50.00% by weight or less. From the viewpoint of increasing the recovery efficiency of resin particles in the washing operation, the lower limit of the polyamide microparticle concentration is preferably 0.05% by weight or more, more preferably 0.10% by weight or more, even more preferably 0.50% by weight or more, and particularly preferably 1.00% by weight or more. From the viewpoint of efficiently washing and removing the resin (B) from the molten mixture in one washing, the upper limit of the concentration of the polyamide fine particles is more preferably 40.00% by weight or less, and even more preferably 30.00% by weight or less.

[0081] The method for recovering the polyamide microparticles (P1) in the recovery step (ST3) is not particularly limited, and methods such as reduced pressure or pressure filtration, decantation, centrifugation, and spray drying can be appropriately selected. The recovered polyamide microparticles (P1) may also be subjected to a drying treatment, if necessary. This drying treatment is preferably carried out at or below the melting point of the polyamide microparticles (P1), and may be carried out under reduced pressure. The method for drying the recovered polyamide microparticles (P1) is not particularly limited, and methods such as air drying, hot air drying, heat drying, reduced pressure drying, and freeze drying can be appropriately selected.

[0082] This production method allows the production of polyamide microparticles (P1) with excellent properties. In particular, the polyamide microparticles (P1) can be produced efficiently by controlling the temperatures of the resins (A) and (B) when forming the polymer / polymer emulsion and the temperature of the molten mixture of the resins (A) and (B) when solidifying the molten mixture.

[0083] (2) Ester oil component An example of an oil component made from an ester compound is an ester oil component that is liquid at 25°C. Here, "liquid at 25°C" means that the component has fluidity, including a paste-like form. Any oil component commonly used in cosmetics may be used. The blending amount of the ester compound is preferably 0.1 to 15 wt. % of the total cosmetic composition, more preferably 1 to 10 wt. However, for the liquid foundation (silicone oil-free) of Composition Example 4 described below, it is preferably 10 to 20 wt. %.

[0084] Examples of ester oil components that become liquid at 25°C include isopropyl myristate, octyldodecyl myristate, isopropyl isostearate, isononyl isononanoate, butyl stearate, oleyl oleate, isotridecyl isononanoate, isostearyl myristate, octyldodecyl ricinoleate, diglyceryl monoisostearate, ethylhexyl palmitate, cetyl ethylhexanoate, octyl methoxycinnamate, tocopherol acetate, propylene carbonate, and malic acid. Diisostearyl, Neopentyl Glycol Dicaprate, Neopentyl Glycol Diethylhexanoate, Diglyceryl Diisostearate, Propanediol Diisostearate, Glyceryl Monomyristate Monoisostearate, Glyceryl Triisostearate, Propanediol Di(Caprate / Caprylate), Glyceryl Tri(Caprylate / Caprate), Triethylhexanoin, Trimethylolpropane Tri-2-ethylhexanoate, Trimethylolpropane Triisostearate , Pentaerythrityl Tetraoctanoate, Pentaerythrityl Tetraethylhexanoate, Pentaerythritol Tetraisostearate, Polyglyceryl-2 Isostearate, Polyglyceryl-2 Diisostearate, Polyglyceryl-2 Triisostearate, Polyglyceryl-2 Tetraisostearate, Polyglyceryl-6 Octacaprylate, Ditrimethylolpropane (Isostearate / Sebacic Acid) Oligoester, Dipentaerythrityl Tripolyhydroxystearate, Lauroyl Lactylate Ester oils that can be used include phytosteryl / octyldodecyl lauroyl glutamate, phytosteryl / behenyl / octyldodecyl lauroyl glutamate, trehalose isostearate esters, dipentaerythrityl tetraisostearate, dipentaerythrityl pentaisostearate, ethylhexyl hydroxystearate, phytosterol fatty acid esters, cholesterol fatty acid esters, polyglycerin fatty acid esters, and pentaerythritol fatty acid esters.

[0085] The oil component may further contain a silicone-based compound in addition to the ester-based compound. An example of an oil component made of a silicone-based compound is a silicone-based oil component that is liquid at 25°C. Here, "liquid at 25°C" means that the component has fluidity, including a paste-like form. Any oil component commonly used in cosmetics may be used. For powder foundations and the like that do not substantially contain water, the blending amount of the silicone-based compound is preferably 0.1 to 15 wt%, and more preferably 1 to 10 wt%, based on the total weight of the cosmetic. For liquid foundations and the like that contain water, the blending amount of the silicone-based compound is preferably 0.1 to 30 wt%, and more preferably 10 to 25 wt%, based on the total weight of the cosmetic.

[0086] Silicone oil components that become liquid at 25°C include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, methyltrimethicone, caprylyl trimethicone, dimethylpolysiloxane, methylphenylpolysiloxane, aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer, aminopropyl dimethicone, amodimethicone, octamethyltrisiloxane, caprylyl methicone, highly polymerized methylpolysiloxane (1), cyclohexasiloxane, and silane. Examples of suitable oleic acid and oleic acid derivatives include cyclopentasiloxane, cyclomethicone, diphenyl dimethicone, diphenylsiloxyphenyl trimethicone, dimethicone, dimethylsiloxane-methylstearoxysiloxane copolymer, dimethyl / stearoxypolysiloxane, stearyl dimethicone, stearoxymethicone / dimethicone copolymer, cetyl dimethicone, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trisiloxane, hydrogen dimethicone, bisaminopropyl dimethicone, biscetearyl amodimethicone, and phenyl trimethicone. These may be used alone or in combination. Additionally, methicone, methyl trimethicone-methylhydrogen polysiloxane, methylphenyl polysiloxane, and methyl polysiloxane may be added as oily bases and gloss enhancers.

[0087] (3) Pigments Examples of pigments that can be used include organic pigment powders such as Red No. 201, Red No. 202, Red No. 205, Red No. 226, Red No. 228, Orange No. 203, Orange No. 204, Blue No. 404, and Yellow No. 401; organic pigment powders such as zirconium, barium, or aluminum lakes such as Red No. 3, Red No. 104, Red No. 106, Orange No. 205, Yellow No. 4, Yellow No. 5, Green No. 3, and Blue No. 1; metal powders such as aluminum powder, gold powder, and silver powder; and composite powders such as fine particle titanium dioxide-coated mica titanium, fine particle zinc oxide-coated mica titanium, barium sulfate-coated mica titanium, titanium oxide-containing silicon dioxide, and zinc oxide-containing silicon dioxide. The pigment content is preferably 0.1 to 15 wt. % of the total cosmetic composition, and more preferably 1 to 10 wt. %.

[0088] (4) Filler The filler is not particularly limited in terms of shape (e.g., spherical, plate-like, needle-like, etc.), particle size (e.g., mist-like, fine particle, pigment-grade, etc.), particle structure (e.g., porous, non-porous, etc.), etc., so long as it is a powder used as a filler for cosmetics, and examples of the filler include inorganic powders, glitter powders, organic powders, pigment powders, metal powders, composite powders, etc. Specific examples include white inorganic pigments such as titanium oxide, zinc oxide, cerium oxide, and barium sulfate; colored inorganic pigments such as iron oxide, carbon black, chromium oxide, chromium hydroxide, iron blue, and ultramarine; talc, muscovite, phlogopite, lepidolite, biotite, synthetic mica, sericite (sericite), synthetic sericite, kaolin, silicon carbide, bentonite, smectite, silicic acid anhydride, aluminum oxide, magnesium oxide, zirconium oxide, antimony oxide, diatomaceous earth, aluminum silicate, magnesium aluminum metasilicate, calcium silicate, barium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, hydroxyapatite, and boron nitride. Examples of suitable fillers include white extender powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, iron oxide titanium mica, Prussian blue-treated mica titanium, carmine-treated mica titanium, bismuth oxychloride, and glittering powders such as fish scale foil; organic polymer resin powders (excluding spherical ones) such as polyamide resins, polyethylene resins, polyacrylic resins, polyester resins, fluorine-based resins, cellulose resins, polystyrene resins, copolymer resins (e.g., styrene-acrylic copolymer resins); polypropylene resins, silicone resins, and urethane resins; organic low-molecular-weight powders (excluding spherical ones) such as zinc stearate and N-acylysine; and natural organic powders (excluding spherical ones) such as starch, silk powder, and cellulose powder. For powder foundations and other products that do not contain substantially water, the filler content is preferably 50 to 95 wt. % of the total cosmetic composition, and more preferably 60 to 90 wt. For liquid foundations and other products that contain water, the filler content is preferably 0.1 to 10 wt. % of the total cosmetic composition.

[0089] (5) Vegetable oil component The vegetable oil component obtained from plants may be any one used in ordinary cosmetics. The blending amount of the vegetable oil is preferably 0.1 to 20% by weight, more preferably 1 to 15% by weight, based on the total weight of the cosmetic. Specific examples include almond oil, Astrocaryum murumuru seed oil, African mango kernel oil, avocado oil, Camellia sinensis seed oil, linseed oil, Argania spinosa kernel oil, almond oil, apricot kernel oil, olive fruit oil, olive oil, cacao butter, Rosa canina fruit oil, canola oil, apricot kernel oil, kukui nut oil, passionflower edulis seed oil, cranberry seed oil, grape seed oil, black currant seed oil, corn oil, sesame oil, wheat germ oil, rice bran oil, rice germ oil, pomegranate seed oil, safflower oil, sunflower oil, shea butter, cottonseed oil, Sclerocarya birrea seed oil, soybean oil, Soybean oil, tea seed oil, tea seed oil, tea oil, evening primrose oil, camellia seed oil, camellia oil, Theobroma grandiflorum seed oil, corn oil, palm kernel oil, palm oil, hybrid safflower oil, hybrid sunflower oil, baobab seed oil, peanut oil, peanut oil, pistachio seed oil, castor oil, sunflower seed oil, sunflower oil, grape seed oil, hazelnut oil, macadamia seed oil, macadamia nut oil, mango seed oil, meadowfoam oil, cottonseed oil, Japan wax oil, peach kernel oil, palm oil, European rubus seed oil, peanut oil, borage seed oil, rosehip oil, and Moringa oleifera seed oil can be used.

[0090] In hair cosmetics and skin cosmetics, the content is preferably 0.1 to 30% by weight, more preferably 1 to 20% by weight, based on the total weight of the cosmetic.

[0091] (6) Plant extracts The plant extract component obtained from plants may be any one used in ordinary cosmetics. The amount of the plant extract to be blended is preferably 0.1 to 20% by weight, more preferably 1 to 15% by weight, based on the total weight of the cosmetic. Specific examples include artichoke leaf extract, artichoke extract, Rehmannia chinensis root extract, Angelica keiskei extract, Angelica keiskei leaf / stem extract, Asparagus stem extract, Aspalathus linearis extract, Acerola fruit extract, Hydrangea tea extract, Althaea officinalis extract, Althaea officinalis root extract, Arnica extract, Arnica flower extract, Aloe extract, Aloe vera leaf extract, Apricot seed extract, Rosa robur extract, Japanese knotweed extract, Japanese knotweed root extract, Ginkgo extract, Ginkgo biloba extract, Oolong tea extract, and Udon Root extract, turmeric rhizome extract, asarum rhizome / root extract, Uva-ursi leaf extract, Satsuma mandarin peel extract, rhizome extract, edelweiss extract, Scutellaria root extract, Scutellaria root extract, Phellodendron bark extract, Coptis japonica extract, Coptis japonica root extract, okra extract, okra fruit extract, Panax ginseng root extract, Hypericum perforatum extract, Hypericum flower / leaf / stem extract, Natura mustard extract, Natura mustard leaf / stem extract, Olive leaf extract, Orange extract, Orange Licorice fruit extract, Pueraria lobata extract, Rosa canina fruit extract, Chamomile flower extract, Chamomilla recutita (matricaria) ET, Chamomilla extract, Chinese quince extract, Artemisia capillaris extract, Artemisia capillaris flower extract, Licorice extract, Licorice root extract, Licorice extract powder, Licorice flavonoids, Licorice flavonoids, Rubus idaeus extract, Kiwi extract, Amaryllis bark extract, Cucumber extract, Cucumber fruit extract, Apricot kernel extract, Quillaja extract, Quillaja bark extract, Pueraria lobata root extract, Gardenia extract, Gardenia fruit extract, Kumazasa Extract, Kumazasa leaf extract, Sophora flavescens extract, Sophora flavescens root extract, Grapefruit extract, Grapefruit fruit extract, Mulberry extract, Alpinia speciosa leaf extract, Gentian extract, Gentian extract, Gentian root extract, Gentian rhizome / root extract, Geranium herb extract, Geranium herb flower / leaf / stem extract, Black tea extract, Coffee extract, Coffee seed extract, Burdock extract, Burdock root extract, Rice extract, Rice bran extract, Averrhoa leaf extract, Chinese radish extract, Cherry leaf extract, Soapwort extract,Soapwort leaf extract, hawthorn extract, Japanese pepper extract, Japanese pepper peel extract, Rehmannia root extract, Lithospermum root extract, Perilla extract, Perilla leaf extract, Linden extract, Peony extract, Peony root extract, Ginger rhizome extract, Ginger extract, Ginger tincture, Calamus root extract, Calamus rhizome extract, Birch extract, Birch extract, Birch sap, Birch bark extract, Honeysuckle extract, Honeysuckle flower extract, Horsetail extract, Starfruit leaf extract, Pinus sylvestris cone extract, Hypericum perforatum flower / leaf / stem extract, Se Ivy extract, Ivy leaf / stem extract, Horse chestnut seed extract, Sambucus nigra extract, Sambucus nigra flower extract, Yarrow extract, Mentha piperita extract, Mentha piperita leaf extract, Sage extract, Sage leaf extract, Mallow extract, Mallow flower extract, Cnidium officinale extract, Cnidium officinale rhizome extract, Swertia japonica extract, Swertia japonica extract liquid, Somei-Yoshino cherry leaf extract, Soybean extract, Soybean seed extract, Thyme extract, Thymus vulgaris flower / leaf / stem extract, Damask rose flower extract Tea extract, Tea leaf extract, Clove extract, Citrus fruit extract, Centella asiatica extract, Centella asiatica extract, Chili pepper fruit extract, Chili pepper tincture, Angelica acutiloba extract, Angelica acutiloba root extract, Calendula officinalis extract, Calendula officinalis flower extract, Peach kernel extract, Houttuynia cordata extract, Tomato extract, Tomato fruit extract, Nagi-kada root extract, Jujube fruit extract, Carrot extract, Garlic extract, Garlic root extract, Rosa multiflora fruit extract, Rosa multiflora extract, Pineapple fruit extract, Pineapple ceramide, Hibiscus flower extract, Parsley extract, Job's tears seed extract, Parsley extract Paia fruit extract, Hamamelis extract, Hamamelis leaf extract, Belamcanda chinensis extract, Belamcanda chinensis extract, Jellyfish extract, Jellyfish leaf / stem extract, Bilberry leaf extract, Loquat leaf extract, Butcher's broom extract, Grape seed extract, Grape leaf extract, Beech extract, Tilia cordata flower extract, Prune enzyme hydrolysate, Prune hydrolysate, Safflower extract, Safflower flower extract, Peony extract, Hop extract, Mulberry root bark extract, Pine extract, Madonna lily root extract, Marjoram extract, Marjoram leaf extract, Horse chestnut extract, Soapberry extract, Soapberry peel extract,Examples of useful extracts include purple root extract, evening primrose seed extract, evening primrose extract, melissa extract, melissa leaf extract, peach seed extract, peach leaf extract, cornflower extract, cornflower flower extract, eucalyptus extract, eucalyptus leaf extract, saxifrage extract, yuzu extract, yuzu fruit extract, yuzu seed extract, yuzu ceramide, oil-soluble licorice extract, lily extract, European birch bark extract, European beech bud extract, coix seed extract, mugwort extract, mugwort leaf extract, rice power, lavender extract, lavender flower extract, apple extract, apple fruit extract, rooibos extract, lemon extract, lemon fruit extract, astragalus extract, rosemary extract, rosemary leaf extract, Roman chamomile extract, Roman chamomile flower extract, wild thyme extract, and burnet extract.

[0092] In hair cosmetics and skin cosmetics, the content is preferably 0.1 to 30% by weight, more preferably 1 to 20% by weight, based on the total weight of the cosmetic.

[0093] (7) UV absorbers The ultraviolet absorber component may be any one that is commonly used in cosmetics. The blending amount of the ultraviolet absorber is preferably 0.01 to 15% by weight, more preferably 0.1 to 10% by weight, based on the total weight of the cosmetic. Specific examples include 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester, 4-tert-butyl-4'-methoxydibenzoylmethane, t-butylmethoxydibenzoylmethane, ethylhexyl triazone, oxybenzone, oxybenzonesulfonic acid, octocrylene, 2-ethylhexyl salicylate, octyl salicylate, homomenthyl salicylate, zinc oxide, titanium oxide, diethylamino hydroxybenzoyl, Examples of compounds that can be used include hexyl paraoxybenzoylbenzoate, terephthalylidene dicamphorsulfonic acid, drometrizole trisiloxane, 2-ethylhexyl paramethoxycinnamate, octyl paramethoxycinnamate, bisethylhexyloxyphenol methoxyphenyl triazine, hydroxymethoxybenzophenone sulfonic acid, phenylbenzimidazole sulfonic acid, ferulic acid, homosalate, homomenthyl salicylate, polysilicone, methylenebisbenzotriazolyltetramethylbutylphenol, and ethylhexyl methoxycinnamate.

[0094] In hair cosmetics and skin cosmetics, the content is preferably 0.01 to 15% by weight, more preferably 0.05 to 10% by weight, based on the total weight of the cosmetic.

[0095] (8) Cosmetics The cosmetic of the present invention includes hair cosmetics such as hair oil, camellia oil, styling products, setting products, blow-drying products, brushing products, hair shaving products, hair sticks, pomades, hair creams, hair milks, hair solids, hair wax, hair balms, hair sprays, hair mists, hair lacquers, hair liquids, hair waters, hair foams, and hair gels, as well as tonics and hair lotions. Hair care products such as hair essences, hair treatments, hair conditioners, and hair packs; hair coloring products such as hair dyes, hair color sprays, hair color sticks, color shampoos, color treatments, color conditioners, color rinses, hair manicures, and hair mascaras; hair washing products such as shampoos and rinses; skin cosmetics such as skin lotions, lotions, softening lotions, astringent lotions, and astringents; moisturizing lotions, serums, and essences; creams such as oily creams, medium-oily creams, and weak-oily creams; creams such as milk lotions, skin milks, and milk; sun tans and sun protects; sunscreen cosmetics; and facial cleansers., cleansing, washing powder, cleanser, makeup remover, face wash, facial soap, scrub cosmetics, cleansing agents such as body shampoo, body soap, body wash, hand soap, shaving cosmetics such as pre-shave and after-shave, cosmetic oils such as olive oil, skin oil, body oil, cosmetic oil, beauty oil, baby oil, finishing cosmetics such as face color, foundation such as concealer, makeup base, makeup primer, makeup base such as pre-makeup, face powder, lucent powder, finishing powder, powder such as highlighter and shading, lipstick such as lipstick, lip rouge, lip color, lip pencil, rouge, lip gloss, lip liner, eye shadow, eye color, eyeliner, eyebrow pencil, eyebrow, eyebrow pencil, eyebrow blush, mascara, eyelash cosmetics, double eyelid cosmetics such as eye makeup, finishing cosmetics such as cheek cosmetics such as blush, blush, cheek color, and cheek rouge; perfumes such as parfum and perfume; eau de cologne such as cologne, fresh cologne, parfum de toilette, perfumed cologne, perfume de toilette, eau de toilette, eau de parfum, and fragrances; bath cosmetics such as bath salts, bath oil, bath essence, bubble bath, and foam bath; nail cosmetics such as nail enamel, nail polish, nail color, nail polish, pedicure, nail lacquer, enamel thinner, nail cream, nail oil, nail polish remover, enamel remover, nail color remover, top coat, overcoat, base coat, nail coat, nail essence, and gel nail; lip care cosmetics such as lip treatment, lip cream, lip balm, and lip oil; and body powders such as talcum powder, bath powder, perfume powder, baby powder, and angelica powder.

[0096] (9) Composition of cosmetics (foundation) For example, it can be formulated as a product such as a powder foundation that does not substantially contain water, but it can also be formulated as a liquid foundation that contains water. The amount of water in the liquid foundation is preferably 35 to 90% by weight, and more preferably 40 to 60% by weight.

[0097] The approximate blend amounts for example powder foundation and liquid foundation compositions (containing silicone oil / not containing silicone oil) are shown below.

[0098] (Composition Example 1) Powder foundation (contains silicone oil) Polyamide microparticles consisting of polyamide 4: 2 to 10% by weight Oil component consisting of ester compounds: 1 to 10% by weight Silicone compound oil component: 1 to 10% by weight Pigment: 1 to 10% by weight Filler: 60-90% by weight

[0099] (Composition Example 2) Powder foundation (silicone oil-free) Polyamide microparticles consisting of polyamide 4: 2 to 15% by weight Oil component consisting of ester compounds: 1 to 10% by weight Pigment: 1 to 10% by weight Filler: 60-90% by weight

[0100] (Composition Example 3) Liquid foundation (containing silicone oil) Polyamide microparticles consisting of polyamide 4: 2 to 15% by weight Oil component consisting of ester compounds: 1 to 5% by weight Silicone compound oil component: 1 to 10% by weight Pigment: 1 to 10% by weight Filler: 0.1 to 10% by weight Water: 40~60% by weight

[0101] (Composition Example 4) Liquid foundation (silicone oil-free) Polyamide microparticles consisting of polyamide 4: 2 to 15% by weight Oil component consisting of ester compounds: 10 to 20% by weight Pigment: 1 to 10% by weight Filler: 0.1 to 10% by weight Water: 40~60% by weight

[0102] Furthermore, it can be formulated as a product such as a powder foundation that does not substantially contain water, but it may also be formulated as a liquid foundation that contains water. The amount of water in the liquid foundation is preferably 35 to 90% by weight, and more preferably 40 to 60% by weight.

[0103] (10) Composition of cosmetics (hair cosmetics) The approximate blending amounts of hair cosmetics are shown below.

[0104] (Composition Example 5) Hair cosmetics Polyamide microparticles consisting of polyamide 4: 1 to 15% by weight Pigment: 0.1 to 10% by weight Filler: 0.1 to 10% by weight Water: 0.1~60% by weight Vegetable oil: 0.1~30% by weight Plant extract: 0.1 to 20% by weight

[0105] (11) Composition of cosmetics (skin cosmetics) The approximate blending amounts of skin cosmetics are shown below.

[0106] (Composition Example 6) Skin Cosmetic 1 Polyamide microparticles consisting of polyamide 4: 1 to 15% by weight Pigment: 0.1 to 10% by weight Filler: 0.1 to 10% by weight Water: 0.1~60% by weight Vegetable oil: 0.1~30% by weight Plant extract: 0.1 to 20% by weight

[0107] (Composition Example 7) Skin Cosmetic 2 Polyamide microparticles consisting of polyamide 4: 1 to 15% by weight Pigment: 0.1 to 10% by weight Filler: 0.1 to 10% by weight Water: 0.1~60% by weight Vegetable oil: 0.1~30% by weight Plant extract: 0.1 to 20% by weight UV absorber: 0.01 to 15% by weight

[0108] The polyamide microparticles made of polyamide 4 used in the OECD 301F test were tested at two levels using the same sample, and after 28 days of culture, the biodegradability was over 60% in both tests, with an average biodegradability of 74%.Similarly, the ASTM D6691 test results showed an average biodegradability of 78% after 120 days of culture, indicating that cosmetics using polyamide microparticles made of polyamide 4 can be mass-produced without being affected by recent microplastic regulations. [Industrial Applicability]

[0109] The cosmetic composition according to the present invention can be produced industrially without being affected by recent microplastic regulations.

Claims

1. A cosmetic comprising polyamide fine particles made of polyamide 4, an oil component made of an ester compound or vegetable oil, a pigment, and a filler.

2. The cosmetic preparation according to claim 1 , wherein the oil component comprises the ester-based compound and a silicone-based compound.

3. The cosmetic preparation according to claim 1 or 2, further comprising water.

4. The cosmetic preparation according to claim 1 , further comprising a plant extract component obtained from a plant, wherein the oil component comprises a vegetable oil.

5. The cosmetic according to claim 1 or 4, further comprising an ultraviolet absorber.

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