Wax composition for cosmetics, oil-based cosmetic, and method for suppressing variation in glossiness of oil-based cosmetic due to change in use environment

Abstract

To provide a wax composition for a cosmetic, which reduces a gloss difference of the wax composition after solidification when solidified from a molten state in a low-temperature and low-humidity environment and when solidified in a high-temperature and high-humidity environment, and can reduce a difference in gloss feeling of an oily cosmetic between the low-temperature and low-humidity environment and the high-temperature and high-humidity environment by being contained in the oily cosmetic.SOLUTION: A wax composition for cosmetics containing a plurality of types of waxes, wherein three or more types of waxes account for 10 parts by mass or more of 100 parts by mass of the wax composition, the total amount of the waxes accounting for 10 parts by mass or more is 50 parts by mass or more, and among the waxes accounting for 10 parts by mass or more, when the crystallization temperature of a wax WA having the highest crystallization temperature is TCA, the crystallization temperature of a wax WB having the lowest crystallization temperature is TCB, and the crystallization temperature of the wax composition is TCW, the following formula (1) is satisfied: TCA> TCW> TCB ≥ 50 °C Formula (1) SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a wax composition for cosmetics, an oil-based cosmetic using the same, and a method for suppressing fluctuations in gloss of an oil-based cosmetic due to changes in the use environment. [Background technology]

[0002] In the field of cosmetics, waxes are added to a wide variety of cosmetic products primarily for the purpose of solidifying, gelling, or thickening base oils that are liquid at room temperature, and are particularly widely used in oil-based cosmetics that use an oily base containing a base oil and a wax.

[0003] On the other hand, oil-based cosmetics are required to have a variety of finishing effects, such as a glossy finish or a matte finish with reduced gloss, in line with the fashion of the season, and therefore cosmetics that can achieve the desired gloss are being studied. For example, Patent Document 1 discloses an oil-based cosmetic composition with excellent glossiness, which contains (A) polyacrylate-44 and (B) inorganic amorphous plate-like particles or a calcined plate-like clay mineral. Patent Document 1 also describes the use of waxes and polymer gelling agents to improve makeup staying power, etc. Patent Document 2 discloses a lip cosmetic having a matte texture, which contains a hydrocarbon wax, a volatile hydrocarbon oil, a silicone film-forming agent, an organically modified clay mineral, and a non-volatile oil that is liquid at 25° C. Patent Document 2 also describes that a dextrin fatty acid ester can be further contained to inhibit wax deposition at high temperatures, for example.

[0004] Oil-based cosmetics such as lipstick and foundation are used in daily life and are therefore often exposed to high temperature and humidity environments from the rainy season through to summer, or low temperature and humidity environments in winter. However, conventional oil-based cosmetics can sometimes suffer from changes in glossiness due to changes in temperature or humidity. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-164448 [Patent Document 2] Japanese Patent Application Publication No. 2023-69432 Summary of the Invention [Problem to be solved by the invention]

[0006] The main object of the present invention is to provide a wax composition for cosmetics in which the difference in gloss of the wax composition after solidification between when it is solidified from a molten state in a low-temperature, low-humidity environment and when it is solidified in a high-temperature, high-humidity environment is reduced, and when it is contained in an oil-based cosmetic, it can reduce the difference in gloss of the oil-based cosmetic due to differences in the usage environment. Another object of the present invention is to provide an oil-based cosmetic that can exhibit a stable glossy appearance even when the use environment changes. Another object of the present invention is to provide a method for suppressing fluctuations in glossiness of an oil-based cosmetic due to changes in the environment in which it is used. [Means for solving the problem]

[0007] As a result of intensive research conducted by the present inventors to solve the above-mentioned problems, they discovered that an oil-based cosmetic containing a wax composition that satisfies specific conditions regarding the crystallization temperature exhibits a stable glossy appearance in environments ranging from low-temperature, low-humidity to high-temperature, high-humidity. This discovery led to the completion of the present invention.

[0008] That is, the cosmetic wax composition of the present invention is a cosmetic wax composition containing multiple types of wax, and contains three or more waxes each accounting for 10 parts by mass or more out of 100 parts by mass of the wax composition, the total amount of the waxes accounting for 10 parts by mass or more being 50 parts by mass or more, and the wax accounting for 10 parts by mass or more having the highest crystallization temperature is designated as W A When A The crystallization temperature of CA The wax with the lowest crystallization temperature is W BWhen B The crystallization temperature of CB , the crystallization temperature of the wax composition is T CW The cosmetic wax composition satisfies the following formula (1) when T CA >T CW >T CB ≧50℃ Formula (1)

[0009] The oil-based cosmetic of the present invention is an oil-based cosmetic containing the above-mentioned cosmetic wax composition of the present invention in a proportion of 1.0 to 40.0% by mass.

[0010] Furthermore, the present invention provides a method for suppressing fluctuations in glossiness of oil-based cosmetics due to changes in the use environment, comprising a wax composition for cosmetics containing multiple types of wax, wherein the wax composition contains three or more types of waxes, each of which accounts for 10 parts by mass or more out of 100 parts by mass, the total amount of the waxes accounting for 10 parts by mass or more being 50 parts by mass or more, and the wax accounting for 10 parts by mass or more having the highest crystallization temperature is designated as W A When A The crystallization temperature of CA The wax with the lowest crystallization temperature is W B When B The crystallization temperature of CB , the crystallization temperature of the wax composition is T CW The present invention provides a method for incorporating a cosmetic wax composition that satisfies the above formula (1) into an oil-based cosmetic. [Effects of the Invention]

[0011] The cosmetic wax composition of the present invention has a small difference in gloss after solidification between when it is solidified from a molten state in a low-temperature, low-humidity environment and when it is solidified in a high-temperature, high-humidity environment, and by incorporating the cosmetic wax composition of the present invention into an oil-based cosmetic, it is possible to reduce the difference in gloss between the oil-based cosmetic when used in a low-temperature, low-humidity environment and when it is used in a high-temperature, high-humidity environment. Furthermore, according to the present invention, it is possible to provide an oil-based cosmetic preparation in which the difference between the glossy feeling when used in a low-temperature, low-humidity environment and the glossy feeling when used in a high-temperature, high-humidity environment is reduced. Furthermore, according to the present invention, it is possible to provide a method for suppressing fluctuations in the glossiness of an oil-based cosmetic due to changes in the environment in which it is used. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the cosmetic wax composition and oil-based cosmetic of the present invention will be described, but the present invention is not limited to the embodiments described in this specification and various modifications are possible within the scope of the gist of the present invention. In the present invention, a numerical range defined using the symbol "to" includes both the upper and lower limits of the symbol "to." For example, "2 to 5" represents a range of 2 or more and 5 or less. Furthermore, in the numerical ranges described in this specification, the upper or lower limit of the numerical ranges can be replaced with values ​​shown in the examples or values ​​that can be uniquely derived from the examples.

[0013] [Cosmetic wax composition] The cosmetic wax composition of the present invention contains three or more waxes, each of which accounts for 10 parts by mass or more of the wax composition, and the wax W having the highest crystallization temperature among the waxes accounting for 10 parts by mass or more. A The crystallization temperature T CA Wax W, which has the lowest crystallization temperature among waxes that account for 10 parts by mass or more B The crystallization temperature T CB , and the crystallization temperature T of the wax composition CW satisfies the above formula (1). An oil-based cosmetic containing such a cosmetic wax composition of the present invention can exhibit a stable glossy appearance in either a low-temperature, low-humidity environment or a high-temperature, high-humidity environment. In other words, by incorporating the cosmetic wax composition of the present invention into an oil-based cosmetic, the difference in gloss between the oil-based cosmetic when used in a low-temperature, low-humidity environment and the oil-based cosmetic when used in a high-temperature, high-humidity environment can be reduced.

[0014] Cosmetics containing the cosmetic wax composition of the present invention are typically oil-based cosmetics containing an oily base that contains the cosmetic wax composition of the present invention and a base oil. Here, the oily base is an oily base obtained by adding the cosmetic wax composition of the present invention to a base oil as a solidifying agent, gelling agent, or thickener. Oil-based cosmetics containing such oily bases have the property of breaking down and becoming liquid when applied to the skin or the like. At this time, the wax crystallizes and solidifies on the surface of the oil-based cosmetic applied to the skin or the like. Therefore, in such oil-based cosmetics, the crystallinity and gloss of the wax significantly affect the gloss of the cosmetic. If the wax contained in a cosmetic product has low crystallinity, the wax solidifies differently on the surface of the cosmetic product, which can impair the glossiness of the cosmetic product. On the other hand, if the wax contained in a cosmetic product has high crystallinity, the surface of the cosmetic product is likely to suffer from glare due to the wax crystals. Therefore, the glossiness of the cosmetic product may differ between a low-temperature, low-humidity environment, where wax crystallizes easily, and a high-temperature, high-humidity environment, where wax crystallizes less easily. In contrast, the cosmetic wax composition of the present invention contains three or more waxes, each accounting for 10 parts by mass or more of the total amount of 100 parts by mass, and therefore does not crystallize excessively even in a low-temperature, low-humidity environment, where wax crystallizes easily. This is presumably because the inclusion of wax compounds with different structures moderately inhibits the formation of wax crystals. Furthermore, by satisfying the above formula (1), the cosmetic wax composition of the present invention is less likely to impair its crystallinity even in a high-temperature, high-humidity environment, where wax crystallizes less easily. This is presumably because satisfying the above formula (1) facilitates the wax to form a moderate eutectic state.

[0033] As such, the cosmetic wax composition of the present invention does not crystallize excessively in a low-temperature, low-humidity environment, and its crystallinity is not impaired even in a high-temperature, high-humidity environment, so there is little difference in gloss between the wax composition when solidified from a molten state in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment. Therefore, in cosmetics containing the cosmetic wax composition of the present invention, the difference in gloss between when used in a low-temperature, low-humidity environment and when used in a high-temperature, high-humidity environment is reduced. In other words, an oil-based cosmetic containing the cosmetic wax composition of the present invention is a cosmetic in which the difference in gloss due to differences in usage environment is reduced, and as a result, it can exhibit a stable gloss in either a low-temperature, low-humidity environment or a high-temperature, high-humidity environment. The term "difference in gloss of the wax composition after solidification when solidified from a molten state in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment" refers to the difference in gloss of the wax composition after solidification when the wax composition in a molten state is solidified in a low-temperature, low-humidity environment and the difference in gloss of the wax composition after solidification when the wax composition in a molten state is solidified in a high-temperature, high-humidity environment.

[0015] The cosmetic wax composition of the present invention contains three or more waxes, each accounting for 10 parts by mass or more of the wax composition per 100 parts by mass. In the present invention, "containing three or more waxes" means containing three or more waxes represented by different rational formulas. Here, the rational formula of a wax refers to the rational formula of the compound that is the main component of the wax. For example, stearyl behenate and behenyl stearate are both monoesters having 40 carbon atoms, but they are distinguished as different waxes. However, stereoisomers are not distinguished from each other. If the wax composition contains less than three types of wax, accounting for 10 parts by mass or more of 100 parts by mass of the wax composition, the wax composition will crystallize excessively in a low-temperature, low-humidity environment, which will likely result in a difference in surface gloss between the wax composition solidified in a low-temperature, low-humidity environment and the wax composition solidified in a high-temperature, high-humidity environment. The waxes accounting for 10 parts by mass or more of 100 parts by mass of the cosmetic wax composition of the present invention may be of three or more types, and are not particularly limited thereto. However, from the viewpoint of reducing the difference in gloss of the wax composition after solidification in a low-temperature, low-humidity environment and a high-temperature, high-humidity environment, it is preferable that the waxes be of three or more types but not more than seven types, and more preferably three or more types but not more than five types.

[0016] In the cosmetic wax composition of the present invention, from the viewpoint of further reducing the difference in gloss between the wax composition after solidification in a low-temperature, low-humidity environment and the wax composition after solidification in a high-temperature, high-humidity environment, the content of the wax that is contained in the greatest amount among three or more waxes that account for 10 parts by mass or more of 100 parts by mass of the wax composition is, relative to 100 parts by mass of the wax composition, preferably 30 parts by mass or more, more preferably 40 parts by mass or more, and even more preferably more than 50 parts by mass, and preferably 80 parts by mass or less, more preferably 70 parts by mass or less. Note that when there are two or more waxes that are contained in the greatest amount, the content of the wax that is contained in the greatest amount refers to the content of each of the two or more waxes. From the same viewpoint as above, the upper limit of the content of the wax with the smallest content among three or more waxes that account for 10 parts by mass or more of 100 parts by mass of the wax composition is preferably 30 parts by mass or less, and more preferably 20 parts by mass or less. When there are two or more waxes with the smallest content, the content of the wax with the smallest content refers to the content of each of the two or more waxes. The content of each wax contained in the cosmetic wax composition of the present invention can be determined, for example, from the amount of each wax added when producing the wax composition. The composition of the wax composition can be confirmed by analysis using gas chromatography or the like.

[0017] In the cosmetic wax composition of the present invention, the total amount of waxes, which accounts for 10 parts by mass or more of 100 parts by mass of the wax composition, may be 50 parts by mass or more. However, from the viewpoint of reducing the difference in gloss of the wax composition after solidification in a low-temperature, low-humidity environment and a high-temperature, high-humidity environment, the total amount of waxes is preferably 70 parts by mass or more, more preferably 80 parts by mass or more, and even more preferably 90 parts by mass or more.

[0018] In the present invention, among three or more waxes that account for 10 parts by mass or more of 100 parts by mass of the cosmetic wax composition, the wax having the highest crystallization temperature is designated as W A When A The crystallization temperature of CA The wax with the lowest crystallization temperature is W B When B The crystallization temperature of CB , the crystallization temperature of the wax composition is T CW When the above formula (1) is satisfied, the following formula (1) is satisfied: As a result, the cosmetic wax composition of the present invention is less likely to lose its crystallinity even in a high-temperature, high-humidity environment. T CA >T CW >T CB ≧50℃ Formula (1) When the wax composition does not satisfy the above formula (1), that is, when T CW ≧T CA , T CB ≧T CW , or 50℃>T CB In this case, the crystallinity may be impaired in a high-temperature and high-humidity environment.

[0019] In the present invention, the crystallization temperature T C is measured by differential scanning calorimetry (DSC). More specifically, the crystallization temperature T CThis can be confirmed by the following procedure using a differential scanning calorimeter (e.g., DSC7000, manufactured by Hitachi High-Tech Science Corporation). First, 10 mg of a measurement sample is weighed into an aluminum sample pan. In a measurement folder into which nitrogen is blown at a flow rate of 60 ml per minute, the weighed measurement sample is heated to 200°C at a heating rate of 5°C per minute, and then held at 200°C for 1 minute to equalize the thermal history between measurement samples. The measurement sample is then cooled from 200°C to 30°C at a cooling rate of 5°C per minute to obtain a DSC curve of the measurement sample during cooling. An exothermic peak is observed during this cooling. The temperature at which the exothermic peak reaches its maximum value in this DSC curve is the crystallization temperature T C The measurement results can be analyzed using, for example, the standard analysis software that comes with the device. When using a DSC7000 manufactured by Hitachi High-Tech Science Corporation as the differential scanning calorimeter, the analysis software that comes with the DSC7000 can be used. The crystallization temperature T C can be measured using the wax added when producing the wax composition as a measurement sample.

[0020] In addition, although not particularly limited, in the cosmetic wax composition of the present invention, the above-mentioned W A The crystallization temperature T CA is preferably 70 to 90°C, more preferably 70 to 85°C, and the crystallization temperature T CW is preferably 60 to 85°C, more preferably 62 to 82°C, and B The crystallization temperature T CB However, the temperature is preferably 55 to 75°C, and more preferably 60 to 72°C. CA , T CW and T CB When the above-mentioned preferable range is satisfied, the wax composition of the present invention can further reduce the difference in gloss between the wax composition after solidification in a low-temperature, low-humidity environment and the wax composition after solidification in a high-temperature, high-humidity environment.

[0021] By adjusting the type and blending ratio of each wax, the crystallization temperature T CW The crystallization temperature T of the wax composition can be set within the above-mentioned preferred range. CW In order to set the value of W within the above-mentioned preferable range, B The above W content A The ratio of the content of (W A / W B ) is preferably 0.5 to 5.8, and more preferably 0.7 to 5.7. In addition, wax W has the highest crystallization temperature. A If there are multiple types, W A The content of these multiple types of wax W A Similarly, the total content of wax W, which has the lowest crystallization temperature, is B If there are multiple types, W B The content of these multiple types of wax W B The total content of

[0022] In addition, in the cosmetic wax composition of the present invention, the above W A The crystallization temperature T CA And the above W B The crystallization temperature T CB The difference between (T CA -T CB ) has a lower limit of preferably 1° C. or higher, more preferably 5° C. or higher, and an upper limit of preferably 25° C. or lower, more preferably 20° C. or lower. This makes it possible to further reduce the difference in gloss of the wax composition after solidification between when it is solidified in a low-temperature, low-humidity environment and when it is solidified in a high-temperature, high-humidity environment. Furthermore, in the cosmetic wax composition of the present invention, the crystallization temperature T CW and the above W A The crystallization temperature T CA The difference between (T CA -T CW ), and the crystallization temperature T CW and the above W B The crystallization temperature T CB The difference between (T CW -T CB) is preferably 0.2° C. or more as a lower limit, more preferably 0.5° C. or more, and even more preferably 1° C. or more, and is preferably 20° C. or less as an upper limit, more preferably 10° C. or less, and even more preferably 6° C. or less. This makes it possible to further reduce the difference in gloss of the wax composition after solidification between when it is solidified in a low-temperature, low-humidity environment and when it is solidified in a high-temperature, high-humidity environment.

[0023] In the cosmetic wax composition of the present invention, waxes having a crystallization temperature of less than 50° C. may be included as waxes contained in an amount of less than 10 parts by mass per 100 parts by mass of the wax composition. On the other hand, from the viewpoint of further reducing the difference in gloss of the wax composition after solidification in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment, the total content of waxes having a crystallization temperature of less than 50° C. is preferably 0.5 parts by mass or less, more preferably 0.1 parts by mass or less, and even more preferably 0 parts by mass, per 100 parts by mass of the wax composition.

[0024] [wax] The wax contained in the wax composition of the present invention can be any wax conventionally used in cosmetics, and is not particularly limited. The wax used in the present invention usually contains a main component compound with a purity of 50% by mass or more. The purity of the wax is not particularly limited, but is preferably 60% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and even more preferably 99% by mass or more. The higher the purity of the wax, the more excellent the effect of the wax composition in solidifying, gelling, or thickening the base oil, and the smaller the difference in gloss of the wax composition after solidification between when solidified in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment. The purity of the wax can be confirmed by analyzing it by gas chromatography (GC). When producing a wax composition, if multiple waxes having the same main component but different purities are used, the mixture of these multiple waxes is considered to be one type of wax in the wax composition.

[0025] Examples of waxes include those classified into groups such as fatty acid ester waxes, aliphatic ketone waxes, aliphatic amide waxes, and hydrocarbon waxes. The fatty acid ester wax contains a fatty acid ester as a main component. The fatty acid ester has a structure in which an ester group is bonded to an aliphatic hydrocarbon group, and may further have a substituent. That is, the fatty acid ester is a compound having a structure consisting of an aliphatic hydrocarbon group and an ester group, and may further have a substituent. The substituent is preferably at least one selected from a carboxy group and a hydroxy group. Examples of fatty acid esters include monoesters obtained by esterification of fatty acids with aliphatic alcohols. Examples of fatty acids used in the synthesis of fatty acid esters include palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, 12-hydroxystearic acid, etc. Among these, it is preferable to use at least one selected from the group consisting of stearic acid, arachidic acid, behenic acid, and lignoceric acid. Examples of aliphatic alcohols used in the synthesis of fatty acid esters include palmityl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, triacontanol, etc. Among these, it is preferable to use at least one selected from arachidyl alcohol and behenyl alcohol. Examples of monoesters obtained by the esterification reaction of fatty acids with fatty alcohols include stearyl stearate, arachidyl stearate, behenyl stearate, stearyl arachidate, arachidyl arachidate, behenyl arachidate, arachidyl behenate, behenyl behenate, triacontanyl cerotenate, stearyl cerotenate, triacontanyl lignocerate, palmityl montanate, and stearyl montanate. Further, examples of fatty acid esters include polyhydric esters obtained by esterification of the above-mentioned fatty acids with polyhydric alcohols, such as ethylene glycol distearate, ethylene glycol dibehenate, glyceryl monostearate, glyceryl tristearate, glyceryl tri-12-hydroxystearate, pentaerythritol tribehenate monoarachidinate, glyceryl triarachidinate, glyceryl tribehenate, glyceryl tetrastearate, glyceryl tetrabehenate, pentaerythrityl tetrabehenate, dipentaerythrityl hexastearate, and dipentaerythrityl hexabehenate. In addition to these, examples of fatty acid esters include esters of polycarboxylic acids such as adipic acid, sebacic acid, maleic acid, fumaric acid, phosphoric acid, phosphonic acid, phosphorous acid, citric acid, and carbonic acid with aliphatic alcohols. Among the fatty acid esters, monoesters of the above-mentioned fatty acids and the above-mentioned fatty alcohols, and polyhydric esters of the above-mentioned fatty acids and polyhydric alcohols are preferably used. More specifically, as the fatty acid ester, it is particularly preferable to use a fatty acid ester obtained by an esterification reaction between at least one alcohol selected from the group consisting of aliphatic alcohols having 18 to 22 carbon atoms, ethylene glycol, glycerin, pentaerythritol, and dipentaerythritol, and a fatty acid having 18 to 22 carbon atoms.

[0026] Aliphatic ketone wax contains an aliphatic ketone as a main component. The aliphatic ketone has a structure in which an aliphatic hydrocarbon group is bonded to a carbonyl group. In other words, the aliphatic ketone is a compound having a structure consisting of an aliphatic hydrocarbon group and a carbonyl group. Examples of aliphatic ketones include dipentadecyl ketone, diheptadecyl ketone, dihenicosane ketone, etc. Among these, at least one selected from dipentadecyl ketone and diheptadecyl ketone is preferably used as the aliphatic ketone.

[0027] Aliphatic amide waxes contain aliphatic amides as the main component. The aliphatic amides have a structure in which an aliphatic hydrocarbon group is bonded to an amide group, and may further have a substituent or a linking group other than an amide group. That is, the aliphatic amides are compounds having a structure consisting of an aliphatic hydrocarbon group and an amide group, and may further have a substituent or a linking group other than an amide group. The substituent is preferably at least one selected from a carboxy group and a hydroxy group. The linking group other than an amide group is preferably an ester group. In the present invention, compounds having an amide group or an ester group as a linking group in their structure are classified as aliphatic amides. Examples of the aliphatic amide include stearamide, erucamide, behenylamide, stearyl stearamide, stearyl erucamide, ethylene bisstearamide, ethylene bisoleylamide, hexamethylene bisstearamide, etc. Among these, at least one selected from stearyl stearamide and stearyl erucamide is preferably used as the aliphatic amide.

[0028] Hydrocarbon wax contains hydrocarbon as a main component. Hydrocarbon is a compound consisting only of carbon atoms and hydrogen atoms. Among them, saturated or unsaturated straight-chain aliphatic hydrocarbons having 30 to 60 carbon atoms and hydrocarbons having a branched structure obtained by substituting aliphatic hydrocarbon groups for hydrogen atoms in the straight-chain aliphatic hydrocarbons are preferably used, and straight-chain saturated aliphatic hydrocarbons having 30 to 60 carbon atoms are more preferably used. Examples of the linear saturated aliphatic hydrocarbon having 30 to 60 carbon atoms include triacontane, pentatriacontane, tritetracontane, tetratetracontane, and pentacontane.

[0029] The cosmetic wax composition of the present invention preferably contains at least one type of wax selected from the group consisting of fatty acid ester waxes, aliphatic ketone waxes, aliphatic amide waxes, and hydrocarbon waxes, as waxes accounting for 10 parts by mass or more of 100 parts by mass of the wax composition, more preferably two or more types of wax selected from this group, and even more preferably two to three types of wax selected from this group. Furthermore, from the viewpoint of reducing the difference in gloss between the wax composition after solidification in a low-temperature, low-humidity environment and that after solidification in a high-temperature, high-humidity environment, a preferred combination of the wax composition is at least one wax selected from the group consisting of aliphatic amide wax, aliphatic ketone wax, and hydrocarbon wax, in combination with a fatty acid ester wax. Among these, it is more preferred to include at least a fatty acid ester wax and a hydrocarbon wax, with the content of the hydrocarbon wax being 10 to 40 parts by mass, and even more preferred 10 to 25 parts by mass, per 100 parts by mass of the wax composition.

[0030] The waxes of the above types can be obtained by conventionally known methods. The fatty acid ester wax can be obtained, for example, by dehydration condensation of a fatty acid and an aliphatic alcohol. Aliphatic ketone wax can be obtained, for example, by heating a metal salt of a fatty acid (for example, a magnesium salt) to 300°C to 350°C in a nitrogen atmosphere. The aliphatic amide wax can be obtained, for example, by dehydration condensation of a fatty acid and an aliphatic amine. Hydrocarbon waxes can be obtained, for example, by refining mineral-derived paraffin wax or Fischer-Tropsch wax, or by subjecting the above-mentioned fatty acid, fatty alcohol, or fatty ketone waxes to a reduction reaction. The wax may be purified as needed.

[0031] The cosmetic wax composition of the present invention may further contain a wax or additive other than wax, the wax being contained in an amount of less than 10 parts by mass per 100 parts by mass of the wax composition. The total content of the wax and additive other than wax, the wax being contained in an amount of less than 10 parts by mass per 100 parts by mass of the cosmetic wax composition of the present invention, may be 50 parts by mass or less per 100 parts by mass of the wax composition, but from the viewpoint of reducing the difference in gloss of the wax composition after solidification between when solidified in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment, the total content is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 10 parts by mass or less.

[0032] The additives other than the wax that may be contained in the cosmetic wax composition of the present invention are not particularly limited, but examples thereof include inorganic fillers such as titanium oxide, organic fillers such as metal soaps, and wax dispersing aids.

[0033] The method for producing the cosmetic wax composition of the present invention is not particularly limited, but examples thereof include the following production method. A method for producing a cosmetic wax composition containing multiple types of wax, comprising: A step of preparing three or more types of waxes each having a different rational formula of a compound serving as a main component; A step of melt-mixing a plurality of types of waxes including the three or more types of waxes to obtain a wax mixture; solidifying and processing the wax mixture to obtain a wax composition; The three or more waxes include at least two waxes having different crystallization temperatures, Each of the three or more waxes accounts for 10 parts by mass or more of the wax composition, and the total amount of the three or more waxes is 50 parts by mass or more relative to 100 parts by mass of the wax composition. Among the three or more waxes, the wax having the highest crystallization temperature is designated as W. A When A The crystallization temperature of CA The wax with the lowest crystallization temperature is W BWhen B The crystallization temperature of CB , the crystallization temperature of the wax composition is T CW A method for producing a cosmetic wax composition, which satisfies the following formula (1) when T CA >T CW >T CB ≧50℃ Formula (1)

[0034] The above manufacturing method is preferable in that any combination of waxes can be blended. In the above-mentioned production method, the method for melting and mixing the multiple types of waxes is not particularly limited, but it is preferable to melt and mix the multiple types of waxes at a temperature equal to or higher than the melting point of each wax so that all the waxes are melted. In the above-described production method, the method for processing the wax mixture solidified after melt mixing is not particularly limited, and may be a method for processing into any form such as pellets, granules, or powder, and any known processing method can be used.

[0035] The method for producing the cosmetic wax composition of the present invention also includes a method for synthesizing each wax simultaneously using raw materials for each wax. This method is preferably used when the wax composition contains only one type of wax or when the wax contained in the wax composition is a mixture of a fatty acid ester and a fatty amide. The cosmetic wax composition of the present invention may also be produced by mixing a wax containing a variety of compounds, such as a naturally occurring wax or a microcrystalline wax, with another wax.

[0036] [Method for suppressing fluctuations in gloss of oil-based cosmetics due to changes in the usage environment] By incorporating the above-described wax composition for cosmetics of the present invention into an oil-based cosmetic, it is possible to suppress fluctuations in gloss of the oil-based cosmetic due to changes in the use environment. That is, the present invention provides a wax composition for cosmetics containing multiple types of wax, wherein the wax composition contains three or more types of wax, each of which accounts for 10 parts by mass or more out of 100 parts by mass of the wax composition, the total amount of the waxes accounting for 10 parts by mass or more is 50 parts by mass or more, and the wax accounting for 10 parts by mass or more is W A When A The crystallization temperature of CA The wax with the lowest crystallization temperature is W B When B The crystallization temperature of CB , the crystallization temperature of the wax composition is T CW The present invention provides a method for suppressing fluctuations in gloss of an oil-based cosmetic due to changes in the usage environment, characterized by including in the oil-based cosmetic a wax composition for cosmetics that satisfies the above formula (1) when Here, the "usage environment" refers to the temperature and humidity when an oil-based cosmetic is used, for example, the temperature and humidity when the oil-based cosmetic is applied to the skin, etc. Furthermore, the "glossiness of an oil-based cosmetic" refers to the glossiness of the applied surface of the oil-based cosmetic formed by applying the oil-based cosmetic to the skin, etc. The glossiness of an oil-based cosmetic can be determined by measuring the glossiness of the applied surface of the oil-based cosmetic in the same environment as the use environment.

[0037] [Oily based cosmetics] The oil-based cosmetic of the present invention is characterized by containing the wax composition of the present invention described above. The oil-based cosmetic of the present invention is typically an oil-based cosmetic containing an oily base containing the wax composition of the present invention described above and a base oil. Note that the oil-based cosmetic of the present invention may consist solely of the oily base. By containing the wax composition of the present invention described above, the oil-based cosmetic of the present invention reduces the difference in glossiness between when used in a low-temperature, low-humidity environment and when used in a high-temperature, high-humidity environment, and therefore can exhibit a stable glossiness even when the usage environment changes.

[0038] (oil-based) The oily base is characterized by containing the wax composition of the present invention and a base oil. In the oil-based base, the content of the wax composition of the present invention is preferably 1.0 to 40.0% by mass relative to 100% by mass of the oil-based base. When the content of the wax composition of the present invention is within the above range, the effect of the wax composition of the present invention, i.e., reducing the difference between the glossiness of an oil-based cosmetic when used in a low-temperature, low-humidity environment and that when used in a high-temperature, high-humidity environment, is fully exhibited. Furthermore, when the content of the wax composition of the present invention is equal to or greater than the above lower limit, the effect of solidifying, gelling, or thickening the base oil to maintain the shape of the oil-based cosmetic is fully exhibited. On the other hand, when the content is equal to or less than the above upper limit, deterioration of the performance of the oil-based cosmetic is suppressed. From this perspective, the content of the wax composition of the present invention is more preferably 3.0 to 30.0% by mass, and even more preferably 5.0 to 20.0% by mass relative to 100% by mass of the oil-based base.

[0039] The base oil contained in the oily base is not particularly limited, and any base oil conventionally used for oily bases can be appropriately selected and used. Examples of base oils include hydrocarbon oils, ester oils, and ether oils. Examples of hydrocarbon oils include decane, dodecane, tetradecane, squalane, squalene, liquid paraffin, α-olefin oligomer, hydrogenated polyisobutene, isoparaffin, etc. Among these, hydrocarbon oils having a branched structure are preferred because they are more likely to exhibit the effects of the wax composition of the present invention. Hydrocarbon oils used as base oils can be distinguished from hydrocarbon waxes in that they are liquid at 25°C. Examples of ester oils include 2-ethylhexyl 2-ethylhexanoate, isononyl 2-ethylhexanoate, diisobutyl adipate, di-2-ethylhexyl succinate, cetyl 2-ethylhexanoate, 2-hexyldecyl 2-ethylhexanoate, neopentyl glycol di-2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, medium-chain fatty acid triglyceride, neopentyl glycol dicaprate, 2-ethylhexyl isononanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, and 2-hexyl myristate. Examples of suitable base oils include ethyl ester oils, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl stearate, ethyl isostearate, isopropyl isostearate, 2-hexyldecyl isostearate, isostearyl isostearate, isodecyl neopentanoate, isostearyl neopentanoate, octyldodecyl neopentanoate, 2-octyldodecyl dimethyloctanoate, 2-ethylhexyl hydroxystearate, 2-octyldodecyl 12-stearoylstearate, oleyl oleate, 2-ethylhexyl salicylate, and dialkyl carbonate. Among these, ester oils having a branched structure are preferred because they more easily exhibit the effects of the wax composition of the present invention. Ester oils used as base oils can be distinguished from fatty acid ester waxes in that they are liquid at 25°C. Examples of ether oils include dioctyl ether, polyoxyethylene-polyoxypropylene dimethyl ether, and the like. At least one oil selected from hydrocarbon oils and ester oils is preferably used as the base oil, as this makes it easier for the wax composition of the present invention to exert its effects.

[0040] In the above oily base, the content of the base oil is adjusted appropriately depending on the application and is not particularly limited, but is usually 50 to 99% by mass, preferably 55 to 98% by mass, and more preferably 70 to 97% by mass, relative to 100% by mass of the oily base.

[0041] The oily base may contain, as necessary, other oil gelling agents or thickeners different from the wax composition of the present invention. Examples of other oil gelling agents include, but are not limited to, condensates of benzaldehydes with pentahydric or higher alcohols, such as dibenzylidene sorbitol, tribenzylidene sorbitol, dibenzylidene xylitol, and paramethoxybenzylidene sorbitol; metal soaps, such as calcium stearate, calcium palmitate, lithium 2-ethylhexanoate, and aluminum 12-hydroxystearate; and amine salts of N-acylamino acids, such as dicaproyl lysine laurylamine salt. When the oily base contains another oil gelling agent or thickener, the total content of the other oil gelling agent and thickener is not particularly limited, but from the viewpoint of not impairing the effects of the present invention, it is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 1 part by mass or less, per 100 parts by mass of the wax composition of the present invention.

[0042] The oily base may contain a colorant, if necessary. The colorant can be appropriately selected from those conventionally used as colorants for oil-based bases, and is not particularly limited, but examples thereof include colored pigments, pearl pigments, metal powder pigments, tar dyes, and natural dyes. inorganic yellow pigments such as yellow iron oxide and ochre; inorganic black pigments such as black iron oxide and carbon black (INCI); inorganic purple pigments such as manganese violet (INCI) and cobalt violet; inorganic green pigments such as chromium hydroxide green (INCI), chromium oxide greens (INCI), cobalt oxide and cobalt titanate (INCI); inorganic blue pigments such as iron blue and ultramarine; lakes of tar-based pigments, lakes of natural pigments, and synthetic resin powders obtained by combining these pigment powders; Examples of pearl pigments include titanium oxide-coated mica, titanium oxide-coated mica, bismuth oxychloride, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, fish scale foil, and titanium oxide-coated colored mica. Examples of metal powder pigments include aluminum powder, copper powder, and stainless steel powder. Examples of tar dyes include Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 215, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 505, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 204, Yellow No. 401, Blue No. 1, Blue No. 2, Blue 201, Blue No. 404, Green No. 3, Green 201, Green No. 204, Green No. 205, Orange No. 201, Orange No. 203, Orange No. 204, Orange No. 206, and Orange No. 207. Examples of natural pigments include powders of carminic acid, laccaic acid (INCI), carthamine, brazilin, crocin, and the like. When the oily base contains a colorant, the content of the colorant is adjusted appropriately depending on the application and is not particularly limited, but is preferably 0.05 to 30.0 parts by mass per 100 parts by mass of the base oil.

[0043] The oily base may further contain components that can be usually added to oily bases, if necessary.

[0044] (Composition of oil-based cosmetics) The oily cosmetic of the present invention contains at least the wax composition of the present invention described above, and typically contains the oily base described above. The oil-based cosmetic of the present invention may further contain, as necessary, components that can be typically incorporated into oil-based cosmetics, such as aqueous components, surfactants, colorants, ultraviolet absorbers, moisturizers, film-forming agents, anti-fading agents, antioxidants, anti-foaming agents, cosmetic ingredients, clay minerals, preservatives, fragrances, etc. The components contained in the oily cosmetic of the present invention and their contents can be determined, for example, from the components used in producing the oily cosmetic and the amounts added. Furthermore, the composition of an oil-based cosmetic can be confirmed by analysis by gas chromatography, and the inclusion of the wax composition of the present invention in an oil-based cosmetic can be confirmed by gas chromatography. If it is difficult to identify the type of wax contained in an oil-based cosmetic by gas chromatography, the structure of the wax can be identified using a gas chromatograph mass spectrometer or the like.

[0045] The content of the wax composition of the present invention contained in the oil-based cosmetic of the present invention is 1.0 to 40.0% by mass relative to 100% by mass of the oil-based cosmetic. When the content of the wax composition of the present invention is within the above range, the effect of the wax composition of the present invention, i.e., reducing the difference between the glossiness of the oil-based cosmetic when used in a low-temperature, low-humidity environment and that when used in a high-temperature, high-humidity environment, is fully exhibited. Furthermore, when the content of the wax composition of the present invention is equal to or greater than the above lower limit, the effect of solidifying, gelling, or thickening the base oil to maintain the shape of the oil-based cosmetic is fully exhibited. On the other hand, when the content is equal to or less than the above upper limit, deterioration of the performance of the oil-based cosmetic is suppressed. From these perspectives, the content of the wax composition of the present invention is preferably 3.0 to 30.0% by mass, more preferably 5.0 to 20.0% by mass, relative to 100% by mass of the oil-based cosmetic.

[0046] (Use in oil-based cosmetics) The uses of the oily cosmetic of the present invention are not particularly limited, but examples thereof include makeup products such as lipstick and foundation, skin care products such as cleansing balms, and hair care products.

[0047] (Method of manufacturing oil-based cosmetics) The method for producing the oily cosmetic of the present invention is not particularly limited, but examples thereof include the following production method. A step of preparing the above-mentioned cosmetic wax composition of the present invention; A step of mixing at least the cosmetic wax composition with a base oil to prepare an oily base; A method for producing an oily cosmetic, comprising the step of preparing an oily cosmetic containing the oily base. In the above-mentioned production method, the method for mixing the cosmetic wax composition with the base oil is not particularly limited, but a method in which the materials are melt-mixed at a temperature equal to or higher than the melting points of the materials to be mixed is preferred. In the above-mentioned production method, in the step of preparing an oil-based cosmetic, any known method for preparing an oil-based cosmetic containing an oily base can be adopted, and there are no particular limitations. [Example]

[0048] The present invention will be described in more detail below with reference to examples and comparative examples, in which % is by mass unless otherwise specified.

[0049] [Wax preparation] Table 1 shows the classification system, main component compound name, purity measured by gas chromatography (GC purity), and crystallization temperature of waxes W-1 to W-14 used in the examples and comparative examples described below.

[0050] [Table 1]

[0051] The procedure for producing the wax, and the methods for measuring the purity and crystallization temperature of the wax will be described below.

[0052] The following commercially available raw materials were used as raw materials for the wax. Stearic acid (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) ·Behendic acid (manufactured by Tokyo Chemical Industry Co., Ltd., GC purity exceeding 98.0%) Arachidic acid (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) Arachidyl alcohol (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) Behenyl alcohol (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) Pentaerythritol (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) Palmitic acid (Tokyo Chemical Industry Co., Ltd., GC purity over 97.0%) Palmityl alcohol (Tokyo Chemical Industry Co., Ltd., GC purity over 98.0%) Erucic acid (Tokyo Chemical Industry Co., Ltd., GC purity over 85%) Stearylamine (Tokyo Chemical Industry Co., Ltd., GC purity over 85%)

[0053] (Production of Wax W-1) <Synthesis of crude product> A 3 L four-neck flask equipped with a thermometer, nitrogen inlet tube, stirring blade, and condenser was charged with 1090.9 g (3.8 mol) of stearic acid and 1200 g (3.7 mol) of behenyl alcohol, and the mixture was reacted at 250 °C under a nitrogen stream. The resulting crude ester weighed 2228.5 g and had an acid value of 5.0 mgKOH / g. This crude ester was mixed with 700 g of toluene and 150 g of 2-propanol, and a 10% by mass aqueous potassium hydroxide solution containing potassium hydroxide in an amount equivalent to 2.0 times the residual acid value of the crude ester was added. The resulting mixture was stirred at 70 °C for 30 minutes. The mixture was then allowed to stand for 30 minutes, allowing it to separate into an oil layer (upper layer) and an aqueous layer (lower layer). The aqueous layer (lower layer) was then removed. The oil layer was then washed four times with water until the pH of the wastewater became neutral, yielding an ester layer. The solvent remaining in the ester layer was distilled off at 180°C and a reduced pressure of 1 kPa, and the ester layer was then filtered to obtain 2072.5 g of a crude product of wax W-1. The GC purity of the crude product obtained was 92.0%.

[0054] <Recrystallization> Subsequently, this crude product was subjected to recrystallization treatment. The recrystallization was carried out by adding 9 parts by mass of toluene and 1 part by mass of isopropyl alcohol to 1 part by mass of the crude product, heating to dissolve, leaving it to stand at room temperature, and collecting the resulting precipitate by filtration. This process was repeated five times. In this way, wax W-1 with a GC purity of 99.3% was obtained.

[0055] (Production of Wax W-2) Wax W-2 with a GC purity of 99.2% was obtained by the same procedure as in the production of Wax W-1, except that behenic acid was used as the fatty acid and arachidyl alcohol was used as the alcohol.

[0056] (Production of Wax W-3) Wax W-3 with a GC purity of 99.1% was obtained by the same procedure as in the production of Wax W-1, except that behenic acid was used as the fatty acid and behenyl alcohol was used as the alcohol.

[0057] (Production of Wax W-4) Instead of the synthesis process, we prepared "Castarwax A Flakes" (a hydrogenated castor oil containing approximately 60% glyceryl tri-12-hydroxystearate as the main component) manufactured by NOF Corporation. This product was subjected to the same recrystallization process as used in the production of Wax W-1, yielding Wax W-4 with a GC purity of 99.4%.

[0058] (Production of Wax W-5) Wax W-5 with a GC purity of 99.3% was obtained by the same procedure as in the production of Wax W-1, except that behenic acid and arachidic acid were used as the fatty acids, pentaerythritol was used as the alcohol, and the recrystallization treatment was changed to the treatment described below. The recrystallization treatment was carried out by first adding 18 parts by mass of toluene and 1 part by mass of isopropyl alcohol to 1 part by mass of the crude product, heating and dissolving the mixture, allowing it to stand at room temperature, removing the resulting precipitate by filtration, and then distilling off the solvent to recover the residue. This process was repeated five times. Thereafter, 4 parts by mass of toluene was added to 1 part by mass of the resulting residue, heating and dissolving the mixture, allowing it to stand at room temperature, and recovering the resulting precipitate by filtration.

[0059] (Production of Wax W-6) Wax W-6 with a GC purity of 99.2% was obtained by the same procedure as in the production of Wax W-1, except that behenic acid was used as the fatty acid and pentaerythritol was used as the alcohol.

[0060] (Production of Wax W-7) Erucic acid (220 g, 0.65 mol) was placed in a 500 mL five-neck flask equipped with a thermometer, nitrogen inlet, and air cooling tube, and stearylamine (175 g, 0.65 mol) was added dropwise using a dropping funnel. The reaction was then carried out at 220 °C, and was terminated when the decrease in acid value per hour reached 0.5 mg KOH / g or less, yielding 382 g of crude wax W-7. The GC purity of the crude product was 72.0%. Next, the obtained crude product was subjected to the same recrystallization treatment as that performed in the production of Wax W-1, to obtain Wax W-7 with a GC purity of 99.2%.

[0061] (Production of Wax W-8) Instead of the synthesis process, diheptadecyl ketone (manufactured by Tokyo Chemical Industry Co., Ltd., GC purity exceeding 95.0%) was prepared and subjected to the same recrystallization treatment as that used in the production of Wax W-1, to obtain Wax W-8 with a GC purity of 99.3%.

[0062] (Production of Wax W-9) Instead of the synthesis process, tetratetracontane (manufactured by Tokyo Chemical Industry Co., Ltd., GC purity exceeding 97.0%) was prepared. This product was subjected to the same recrystallization treatment as that used in the production of Wax W-1, to obtain Wax W-9 with a GC purity of 99.3%.

[0063] (Production of Wax W-10) A compound (crude product) that was not subjected to recrystallization treatment was obtained by the same procedure as in the synthesis of the crude product carried out in the production of wax W-1, and this was designated wax W-10 (GC purity 92.0%).

[0064] (Production of Wax W-11) A crude product without recrystallization treatment was obtained using the same procedure as in the synthesis of the crude product used in the production of wax W-2, and designated wax W-11 (GC purity 92.1%).

[0065] (Production of Wax W-12) A crude product was obtained without recrystallization treatment using the same procedure as in the synthesis of the crude product used in the production of wax W-3, and designated wax W-12 (GC purity 91.5%).

[0066] (Production of Wax W-13) The product name "Castarwax A Flakes" manufactured by NOF Corporation (hydrogenated castor oil containing approximately 60% glyceryl tri-12-hydroxystearate as the main component) was used as Wax W-13.

[0067] (Production of Wax W-14) Wax W-14 with a GC purity of 99.4% was obtained by the same procedure as in the production of Wax W-1, except that palmitic acid was used as the fatty acid and palmityl alcohol was used as the alcohol.

[0068] (Method for measuring purity) The GC purity of each wax was measured using a gas chromatograph system (Nexis GC-2030 manufactured by Shimadzu Corporation). The column used was a RESTEK MXT-1HT SimDist. The column temperature was increased from an initial temperature of 100°C to 430°C at a rate of 10°C / min and held at 430°C for 60 minutes. The injection temperature was 430°C, and the detection temperature was 430°C.

[0069] (Measurement of crystallization temperature) The crystallization temperature of each wax was measured using a differential scanning calorimeter (DSC7000 manufactured by Hitachi High-Tech Science Corporation). Specifically, 10 mg of the measurement sample (wax) was weighed into an aluminum sample pan. The weighed measurement sample was heated to 200°C at a heating rate of 5°C per minute in a measurement folder into which nitrogen was blown at a flow rate of 60 ml per minute, and then held at 200°C for 1 minute to equalize the thermal history between the measurement samples. The measurement sample was then cooled from 200°C to 30°C at a cooling rate of 5°C per minute to obtain a DSC curve of the measurement sample during cooling. The temperature at which the exothermic peak reached its maximum during cooling was determined as the crystallization temperature T C The measurement results were analyzed using the analysis software attached to the differential scanning calorimeter (DSC7000).

[0070] (Preparation of wax composition) [Examples 1 to 14 and Comparative Examples 1 to 6] Waxes W-1 to W-14 were selected and weighed to obtain the compositions shown in Table 2, and placed in a 0.3 L separable flask equipped with a stirring blade and a nitrogen inlet tube. The selected waxes were melt-mixed at a temperature equal to or higher than the melting points of the waxes, and then stirred at 150°C for 1 hour under a nitrogen stream. After cooling, solidification, and pulverization, powdered wax compositions C-1 to C-14 of Examples 1 to 14 and wax compositions C-15 to C-20 of Comparative Examples 1 to 6 were obtained. Table 2 shows the content of waxes W-1 to W-14 relative to 100 parts by mass of each wax composition. Table 3 also shows the wax W having the highest crystallization temperature among the waxes that account for 10 parts by mass or more of each wax composition. A The wax number and the wax with the lowest crystallization temperature are B Wax number, W B W content A The ratio of the content of (W A / W B ), the number of wax types that account for 10 parts by mass or more, the parts by mass of the wax that is most abundant in the wax composition, and the total amount of waxes that account for 10 parts by mass or more.

[0071] [Table 2]

[0072] [Table 3]

[0073] [Measurement of Crystallization Temperature of Wax Composition] The DSC curve of the wax composition was obtained using the same equipment and conditions as those used to measure the crystallization temperature of the wax. CW asked for.

[0074] [Evaluation of gloss of wax composition] For wax compositions C-1 to C-20, the difference in gloss when solidified from a molten state in a low-temperature, low-humidity environment and when solidified from a molten state in a high-temperature, high-humidity environment was evaluated as follows.

[0075] (1) Measurement of gloss of wax composition when solidified in a low-temperature, low-humidity environment A molten liquid was obtained by melting 10.0 g of a powdery wax composition at a temperature equal to or higher than the melting point. The molten liquid was uniformly applied to a 5 cm x 5 cm piece of artificial leather and cooled in a thermostatic chamber set to a low-temperature, low-humidity environment of 0°C and a relative humidity of 40%, thereby solidifying the molten liquid (wax composition) on the artificial leather in a low-temperature, low-humidity environment. After solidification, the gloss of the coated surface of the wax composition was measured at 10 points using a Gloss Checker IG-320 manufactured by Horiba, Ltd., at an incident angle of 60°C, and the average value was calculated as Gloss. L It was decided.

[0076] (2) Measurement of gloss of wax composition when solidified in a high temperature and humidity environment A molten liquid was obtained by melting 10.0 g of a powdery wax composition at a temperature equal to or higher than the melting point. The molten liquid was uniformly applied to a 5 cm x 5 cm piece of artificial leather and cooled in a thermostatic chamber set to a high-temperature, high-humidity environment of 40°C and a relative humidity of 80%, thereby solidifying the molten liquid (wax composition) on the artificial leather under a high-temperature, high-humidity environment. After solidification, the gloss of the coated surface of the wax composition was measured at 10 points using a Gloss Checker IG-320 manufactured by Horiba, Ltd., at an incident angle of 60°C, and the average value was calculated as Gloss. H It was decided.

[0077] (3) Difference in gloss between low temperature and low humidity environments and high temperature and high humidity environments The gloss difference ΔG between the low-temperature, low-humidity environment and the high-temperature, high-humidity environment was calculated using the following formula (2), and evaluated according to the following evaluation criteria. The ΔG values ​​and evaluation results are shown in Table 4. ΔG=|G L -G H | Formula (2) <Evaluation criteria> ◎:ΔG<1.0 ○: 1.0≦ΔG≦3.0 ×:3.0<ΔG

[0078] [Table 4]

[0079] As shown in Table 2 or Table 3, the wax compositions C-1 to C-14 of Examples 1 to 14 contain three or more waxes each accounting for 10 parts by mass or more of 100 parts by mass of the wax composition, and the total amount of the waxes accounting for 10 parts by mass or more is 50 parts by mass or more. As shown in Table 4, the wax composition C-1 to C-14 contains the wax W having the highest crystallization temperature. A The crystallization temperature T CA , wax W with the lowest crystallization temperature B The crystallization temperature T CB , and the crystallization temperature T of the wax composition CW were wax compositions of the present invention, which satisfied the above formula (1). As shown in Table 4, wax compositions C-1 to C-14 showed a small difference in gloss after solidification between when they were solidified from a molten state in a low-temperature, low-humidity environment and when they were solidified in a high-temperature, high-humidity environment. Among wax compositions C-1 to C-14, wax compositions C-2 to C-5 and C-7 to C-12, which satisfy the preferred conditions of the present invention in that they satisfy at least one of the following conditions (i) and (ii), showed a small difference in gloss, and wax compositions C-4 and C-9 to C-12, which satisfy the particularly preferred conditions of the present invention in that they satisfy both the following conditions (i) and (ii), showed an especially small difference in gloss. (i) The wax composition contains two or more types of waxes selected from the group consisting of fatty acid ester waxes, aliphatic ketone waxes, aliphatic amide waxes, and hydrocarbon waxes. (ii) The content of the wax with the highest content exceeds 50 parts by mass per 100 parts by mass of the wax composition.

[0080] On the other hand, the wax composition C-15 of Comparative Example 1 and the wax composition C-16 of Comparative Example 2 had a crystallization temperature T CW However, wax W has the lowest crystallization temperature. B The crystallization temperature T CB The above formula (1) was not satisfied at a point lower than the above. The wax composition C-17 of Comparative Example 3 and the wax composition C-18 of Comparative Example 4 had a crystallization temperature T CW However, wax W has the highest crystallization temperature. A The crystallization temperature T CA The above formula (1) was not satisfied at points higher than the above. The wax composition C-19 of Comparative Example 5 contained only two types of wax, each of which accounted for 10 parts by mass or more per 100 parts by mass of the wax composition. The wax composition C-20 of Comparative Example 6 is a wax composition having the lowest crystallization temperature, W B The crystallization temperature T CB was less than 50°C, and therefore did not satisfy the above formula (1). As shown in Table 4, wax compositions C-15 to C-20 of Comparative Examples 1 to 6 showed a large difference in gloss after solidification when solidified from a molten state in a low-temperature, low-humidity environment and when solidified in a high-temperature, high-humidity environment.

[0081] [Examples 15 to 38 and Comparative Examples 7 to 16] According to Table 5, a mixture of the wax composition, base oil, and colorant was melted and mixed at 100°C on a hot plate in an aluminum pan, and then allowed to cool at room temperature for 30 minutes to obtain oily bases O-1 to O-34. "Pearleam EX" shown in Table 5 is hydrogenated polyisobutene (product name: Pearlleam (registered trademark) EX) manufactured by NOF Corporation. "Cetiol SN-1" is cetyl ethylhexanoate (product name: Cetiol (registered trademark) SN-1) manufactured by BASF. Red No. 215 was used as the colorant.

[0082] [Evaluation of gloss of oil-based materials] For oily bases O-1 to O-34, the difference in gloss between when used in a low-temperature, low-humidity environment and when used in a high-temperature, high-humidity environment was evaluated as follows.

[0083] The oil base was left to stand for one week in a thermostatic chamber set to a low-temperature, low-humidity environment of 0°C and a relative humidity of 40%, and then the oil base after standing was evenly applied to a 5cm x 5cm piece of artificial leather in the same environment, and this was used as the application surface of the oil base when used in a low-temperature, low-humidity environment. The gloss of the oil base application surface was measured at 10 points in the above low-temperature, low-humidity environment using a Gloss Checker IG-320 manufactured by Horiba Ltd. at an incident angle of 60°C, and the average value was calculated as G LL It was decided.

[0084] The oil base was left to stand for one week in a thermostatic chamber set to a high temperature and humidity environment of 40°C and a relative humidity of 80%, and then the oil base after standing was uniformly applied to a 5cm x 5cm piece of artificial leather in the same environment, and this was used as the application surface of the oil base when used in a high temperature and humidity environment. The gloss of the oil base application surface was measured at 10 points in the above high temperature and humidity environment using a Gloss Checker IG-320 manufactured by Horiba Ltd. at an incident angle of 60°C, and the average value was calculated as G HH It was decided.

[0085] The glossiness G of the oil-based coating surface when used in a low-temperature, low-humidity environment is calculated using the following formula (3): LL and the glossiness G of the oil-based coating surface when used in a high-temperature, high-humidity environment. HH Difference ΔG O was calculated and evaluated according to the following criteria. O The values ​​and evaluation results are shown in Table 5. ΔG O =|G HH -G LL | Formula (3) <Evaluation criteria> ◎:ΔG O <3 ○:3≦ΔG O ≦5 ×:5<ΔG O

[0086] [Table 5]

[0087] Oil-based bases O-1 to O-24, containing wax compositions C-1 to C-14 in the range of 1.0 to 40.0% by mass, showed little difference in gloss when used in a low-temperature, low-humidity environment and when used in a high-temperature, high-humidity environment. This demonstrated that by incorporating specific amounts of wax compositions C-1 to C-14 into oil-based cosmetics, it is possible to reduce differences in the glossiness of oil-based cosmetics due to differences in the usage environment. In other words, it was demonstrated that oil-based cosmetics containing wax compositions C-1 to C-14 exhibit a stable glossiness even when the usage environment changes. It was also demonstrated that by incorporating wax compositions such as wax compositions C-1 to C-14 into oil-based cosmetics, it is possible to suppress fluctuations in the glossiness of oil-based cosmetics due to changes in the usage environment. Furthermore, among wax compositions C-1 to C-14, wax compositions C-4, C-9 to C-12, which satisfy the particularly preferred conditions in the present invention in that they satisfy both the above-mentioned conditions (i) and (ii), were added to a preferred amount of base oil to produce oily bases O-4, O-9 to O-12, O-18, O-21, and O-24, which obtained significantly good evaluation results. This indicates that the wax compositions of the present invention, which satisfy the above-mentioned preferred conditions, can remarkably exhibit the effects of the present invention.

[0088] On the other hand, oil-based bases O-25 to O-30 containing wax compositions C-15 to C-20, and oil-based bases O-31 to O-34 containing wax composition C-4 at 60% by mass or 0.5% by mass, showed a large difference in gloss when used in a low-temperature, low-humidity environment and when used in a high-temperature, high-humidity environment. This indicates that even if wax compositions C-15 to C-20 are added to oil-based cosmetics, the effect of reducing differences in glossiness of oil-based cosmetics due to differences in usage environment is poor, and that if the amount of wax composition contained in the oil-based cosmetics is too high or too low, the effect of reducing differences in glossiness of oil-based cosmetics due to differences in usage environment is also poor.

Claims

1. A cosmetic wax composition containing multiple types of wax, The wax composition contains three or more waxes, each of which accounts for 10 parts by mass or more out of 100 parts by mass, and the total amount of the waxes accounting for 10 parts by mass or more is 50 parts by mass or more. Among the waxes accounting for 10 parts by mass or more, the wax having the highest crystallization temperature is W Ａ When Ａ The crystallization temperature is T ＣＡ The wax with the lowest crystallization temperature is designated as W Ｂ When Ｂ The crystallization temperature is T ＣＢ The crystallization temperature of the wax composition is T ＣＷ The cosmetic wax composition satisfies the following formula (1) when T ＣＡ >T ＣＷ >T ＣＢ ≥50℃ Equation (1)

2. An oil-based cosmetic comprising the cosmetic wax composition according to claim 1 in an amount of 1.0 to 40.0% by mass.

3. A cosmetic wax composition containing multiple types of wax, comprising three or more waxes each accounting for 10 parts by mass or more of 100 parts by mass of the wax composition, wherein the total amount of the waxes accounting for 10 parts by mass or more is 50 parts by mass or more, and among the waxes accounting for 10 parts by mass or more, a wax having the highest crystallization temperature is designated as W Ａ When Ａ The crystallization temperature is T ＣＡ The wax with the lowest crystallization temperature is designated as W Ｂ When Ｂ The crystallization temperature is T ＣＢ The crystallization temperature of the wax composition is T ＣＷ A method for suppressing fluctuations in gloss of an oil-based cosmetic due to changes in the usage environment, characterized by including in the oil-based cosmetic a wax composition for cosmetics that satisfies the following formula (1): T ＣＡ >T ＣＷ >T ＣＢ ≥50℃ Equation (1)

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