Hardness improver for oil-based solid cosmetics and method for using an oligoester as a hardness improver for improving the hardness of oil-based solid cosmetics

Abstract

The present invention relates to an oligoester obtained by an esterification reaction of component (1): one or more waxes selected from vegetable waxes that are solid at 25°C and animal waxes that are solid at 25°C; and component (3): component (A) glycerin, component (B) a divalent carboxylic acid having 2 to 12 carbon atoms, component (C) one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid, and component (D) one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms. the esterification reaction is carried out with 0.65 to 0.8 mol of the component (B) and 1.2 to 1.7 mol of a total amount of the component (C) and the component (D) per 1 mol of the component (A), the mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, and the oligoester has an acid value of 5 mgKOH / g or less, a saponification value of 420 to 510 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less.

Description

[Technical field]

[0001] The present invention relates to an oily solid cosmetic preparation containing an oligoester. [Background technology]

[0002] In recent years, from the viewpoints of safety and aesthetics, many naturally derived cosmetics have appeared on the market. In the midst of this market situation, consumer demand for naturally derived oil-based solid cosmetics is also increasing. For example, Patent Document 1 discloses an oil-based solid lip cosmetic that contains sunflower wax, a paste-like dimer acid ester, and an ester of monoglycerin or polyglycerin, thereby achieving both moldability and usability. The technology described in Patent Document 1 achieves both moldability and usability, but it is difficult to obtain a glossy texture because it is essential to contain a large amount of paste oil. In addition, the prevention of oil stains has not been considered.

[0003] Patent Document 2 discloses a lipstick composition that contains natural wax, mineral oil, and castor oil, and thereby has excellent aesthetic properties and lip protection effects. However, although it has excellent aesthetic properties and lip protection effects, it has a problem of poor oxidation stability due to the large amount of castor oil contained.

[0004] Patent Document 3 discloses a technique for improving shape retention even with a small amount of wax by using selected rice bran wax. However, rice bran wax that meets this performance requirement is difficult to obtain, and is therefore not practical.

[0005] Meanwhile, oligoesters have been used in cosmetics for the reasons of their skin moisturizing effect, high safety, and excellent pigment dispersibility. A representative example of oligoesters blended into cosmetics is an oligoester that functions as a gelling or solidifying agent for liquid oil (Patent Document 4). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7072845 [Patent Document 2] Japanese Patent Application Publication No. 6-316509 [Patent Document 3] JP 2009-179564 A [Patent Document 4] Japanese Patent Application Publication No. 7-126604 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide an oil-based solid cosmetic preparation which contains a vegetable wax or an animal wax, has excellent shape retention, is effective in suppressing oil stains during use, and has a good feel when used. Another object of the present invention is to provide a hardness enhancer that has an excellent hardness enhancing effect when mixed with a vegetable wax or an animal wax. [Means for solving the problem]

[0008] The present inventors have conducted intensive research to solve the above problems, and as a result have found that an oligoester obtained by an esterification reaction between glycerin, a divalent carboxylic acid having 2 to 12 carbon atoms, and a specific combination of two or more fatty acids has excellent shape retention, inhibition of oily stains during use, and feeling when used, and also has excellent oxidation stability of an oil-based solid cosmetic composition containing a vegetable wax or an animal wax that is solid at 25°C, which has led to the completion of the present invention.

[0009] That is, the present invention includes the following aspects. [1] Component (1): One or more waxes selected from vegetable waxes that are solid at 25°C and animal waxes that are solid at 25°C; and Component (3): An oligoester obtained by esterification reaction of glycerin as component (A), a divalent carboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms as component (D), wherein the esterification reaction is carried out in an amount of 0.65 to 0.8 moles of component (B) and 1.2 to 1.7 moles of the total amount of component (C) and component (D) per mole of component (A). a mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, preferably component (C):component (D)=10:90 to 99:1, more preferably component (C):component (D)=25:75 to 99:1, even more preferably component (C):component (D)=40:60 to 99:1, still more preferably component (C):component (D)=40:60 to 70:30, most preferably component (C):component (D)=50:50 to 70:30, and also preferably component (C):component (D)=10:90 to 70:30; an oligoester having an acid value of 5 mgKOH / g or less, preferably 0 to 3 mgKOH / g, and more preferably 0 to 2 mgKOH / g, a saponification value of 420 to 510 mgKOH / g, preferably 420 to 490 mgKOH / g, and more preferably 430 to 490 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less, preferably 0 to 60 mgKOH / g, more preferably 0 to 40 mgKOH / g, further preferably 0 to 35 mgKOH / g, and further preferably 0 to 20 mgKOH / g; An oil-based solid cosmetic preparation comprising: [2] The oil-based solid cosmetic preparation according to [1] above, characterized in that the component (1) is one or more selected from the group consisting of carnauba wax, rice bran wax, candelilla wax, sunflower seed wax, and beeswax. [3] The oil-based solid cosmetic preparation according to [1] or [2] above, wherein the vegetable wax is one or more selected from the group consisting of carnauba wax, rice bran wax, candelilla wax, and sunflower seed wax. [4] The oil-based solid cosmetic preparation according to any one of the above [1] to [3], characterized in that the oil-based solid cosmetic preparation does not contain any hydrocarbon wax (excluding vegetable waxes containing naturally derived hydrocarbon components and animal waxes containing naturally derived hydrocarbon components). [5] The oil-based solid cosmetic preparation according to any one of the above [1] to [4], wherein the component (B) is succinic acid. [6] The oil-based solid cosmetic preparation according to any one of the above [1] to [5], wherein the component (C) is caprylic acid. [7] The oil-based solid cosmetic preparation according to any one of the above [1] to [6], wherein the component (D) is capric acid. [8] The oil-based solid cosmetic preparation according to any one of the above [1] to [7], wherein the component (B) is succinic acid, the component (C) is caprylic acid, and the component (D) is capric acid. [9] Furthermore, Component (2): An oil component that is liquid or pasty at 20°C (excluding component (3) above) The oil-based solid cosmetic preparation according to any one of the above [1] to [8],

[10] The oil-based solid cosmetic according to any one of [1] to [8] above, wherein the content of component (1) is 5 to 30% by mass, preferably 5% by mass or more and less than 30% by mass, more preferably 10 to 30% by mass, more preferably 10% by mass or more and less than 30% by mass, and even more preferably 14 to 20% by mass, and the content of component (3) is 10 to 90% by mass, preferably 20 to 90% by mass, and more preferably 20 to 60% by mass, relative to the entire oil-based solid cosmetic.

[11] The oil-based solid cosmetic according to [9] or

[10] above, wherein the content of component (1) is 5 to 30% by mass, preferably 5% by mass or more and less than 30% by mass, more preferably 10 to 30% by mass, more preferably 10% by mass or more and less than 30% by mass, and even more preferably 14 to 20% by mass, the content of component (2) is more than 0% by mass and 60% by mass or less, preferably more than 0% by mass and 50% by mass or less, more preferably more than 0% by mass and 40% by mass or less, and the content of component (3) is 10 to 90% by mass, preferably 20 to 90% by mass, and more preferably 20 to 60% by mass, relative to the entire oil-based solid cosmetic.

[12] The oil-based solid cosmetic preparation according to any one of the items [9] to

[11] , wherein the mass ratio of the component (3) to the total amount of the component (2) and the component (3) ([the content (g) of the component (3)] / ([the content (g) of the component (2)]+[the content (g) of the component (3)]) is 0.2 to 1.0.

[13] Furthermore, Ingredient (4): One or more selected from the group consisting of 1,2-hexanediol, caprylyl glycol, ethylhexylglycerin, and phenoxyethanol The oil-based solid cosmetic preparation according to any one of the above [1] to

[12] ,

[14] The oil-based solid cosmetic preparation according to any one of the above [1] to

[13] , wherein the oil-based solid cosmetic preparation is a stick-type cosmetic preparation.

[15] A hardness enhancer for enhancing the hardness of an oil-based solid cosmetic, comprising an oligoester obtained by esterification reaction of component (A) glycerin, component (B) a divalent carboxylic acid having 2 to 12 carbon atoms, component (C) one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid, and component (D) one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms, The esterification reaction is an esterification reaction of 0.65 to 0.8 moles of the component (B) and 1.2 to 1.7 moles of the total amount of the component (C) and the component (D) per mole of the component (A), and the mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, and preferably component (C):component (D)= Preferably, the ratio of component (C):component (D) is 10:90 to 99:1, more preferably, component (C):component (D) is 25:75 to 99:1, even more preferably, component (C):component (D) is 40:60 to 99:1, even more preferably, component (C):component (D) is 40:60 to 70:30, and most preferably, component (C):component (D) is 50:50 to 70:30. It is also preferred that the ratio of component (C):component (D) is 10:90 to 70:30. The oligoester has an acid value of 5 mgKOH / g or less, preferably 0 to 3 mgKOH / g, and more preferably 0 to 2 mgKOH / g, a saponification value of 420 to 510 mgKOH / g, preferably 420 to 490 mgKOH / g, and more preferably 430 to 490 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less, preferably 0 to 60 mgKOH / g, more preferably 0 to 40 mgKOH / g, further preferably 0 to 35 mgKOH / g, and still more preferably 0 to 20 mgKOH / g. The oil-based solid cosmetic preparation is an oil-based solid cosmetic preparation containing one or more waxes selected from vegetable waxes that are solid at 25°C and animal waxes that are solid at 25°C.

[16] Use of an oligoester as a hardness enhancer for enhancing the hardness of an oil-based solid cosmetic, comprising: The oligoester is obtained by an esterification reaction of glycerin as component (A), a divalent carboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms as component (D); the esterification reaction is an esterification reaction of 0.65 to 0.8 mol of the component (B) and 1.2 to 1.7 mol of the total amount of the component (C) and the component (D) relative to 1 mol of the component (A), The mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, preferably component (C):component (D)=10:90 to 99:1, more preferably component (C):component (D)=25:75 to 99:1, even more preferably component (C):component (D)=40:60 to 99:1, still more preferably component (C):component (D)=40:60 to 70:30, most preferably component (C):component (D)=50:50 to 70:30, and also preferably component (C):component (D)=10:90 to 70:30; The oligoester has an acid value of 5 mgKOH / g or less, preferably 0 to 3 mgKOH / g, and more preferably 0 to 2 mgKOH / g, a saponification value of 420 to 510 mgKOH / g, preferably 420 to 490 mgKOH / g, and more preferably 430 to 490 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less, preferably 0 to 60 mgKOH / g, more preferably 0 to 40 mgKOH / g, further preferably 0 to 35 mgKOH / g, and still more preferably 0 to 20 mgKOH / g. The oil-based solid cosmetic preparation is characterized in that it contains one or more types of wax selected from vegetable waxes that are solid at 25°C and animal waxes that are solid at 25°C. Effect of the Invention

[0010] According to the present invention, it is possible to provide an oil-based solid cosmetic which contains a vegetable wax or an animal wax, has excellent shape retention, is effective in suppressing oil stains during use, and has a good feel when used. Furthermore, according to the present invention, it is possible to provide a hardness enhancer that has an excellent hardness enhancing effect on one or more types of wax selected from vegetable waxes that are solid at 25°C and animal waxes that are solid at 25°C. [Embodiment for Carrying Out the Invention]

[0011] In the present invention and the present specification, with respect to a numerical range, the expression "A or more and B or less (A and B are real numbers satisfying A < B)" may be represented as "A to B". For example, when described as "1 to 10 parts by mass", it means a numerical range from 1 part by mass to 10 parts by mass, including the lower limit value (1 part by mass) and the upper limit value (10 parts by mass), that is, "1 part by mass or more and 10 parts by mass or less".

[0012] [Oil-based Solid Cosmetics] The outline of the oil-based solid cosmetics of the present embodiment will be described. The oil-based solid cosmetics of the present embodiment contain the following specific wax (component (1)) and specific oligoester (component (3)). Further, it is also preferable that the oil-based solid cosmetics of the present embodiment contain the following component (2) in addition to the following components (1) and (3). Component (1): One or more waxes selected from a plant-based wax that is solid at 25°C and an animal-based wax that is solid at 25°C. Component (2): An oily component that is liquid or paste-like at 20°C (excluding component (3)). Component (3): An oligoester obtained by subjecting component (A): glycerin, component (B): a dicarboxylic acid having 2 to 12 carbon atoms, component (C): one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid, and component (D): one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms to an esterification reaction, having an acid value of 5 mg KOH / g or less, a saponification value of 420 to 510 mg KOH / g, and a hydroxyl value of 60 mg KOH / g or less.

[0013] (Component (1)) The wax of component (1) contained in the oil-based solid cosmetic of this embodiment is one or more types of wax selected from vegetable waxes that are solid at 25° C. and animal waxes that are solid at 25° C. By incorporating vegetable waxes or animal waxes together with the specific oligoester of component (3), an oil-based solid cosmetic that is excellent in shape retention, inhibition of oil stains during use, and usability can be obtained. The wax of component (1) contained in the oil-based solid cosmetic of this embodiment may be one type, or two or more types. The above-mentioned "vegetable wax" and "animal wax" refer to wax derived from plants or animals, respectively. The oil-based solid cosmetic of this embodiment preferably does not contain hydrocarbon waxes such as ozokerite, ceresin, paraffin, petrolatum, microcrystalline wax, Fischer-Tropsch wax, polyethylene wax, and ethylene-propylene copolymer. However, vegetable waxes containing naturally derived hydrocarbon components and animal waxes containing naturally derived hydrocarbon components are not included in the above-mentioned hydrocarbon waxes and can be used as the wax of component (1). For example, an example of a vegetable wax containing naturally derived hydrocarbon components is candelilla wax hydrocarbon.

[0014] The wax of component (1) is not particularly limited as long as it is a vegetable wax or animal wax that is solid at 25° C. and melts to a liquid at 120° C. The wax of component (1) is preferably a vegetable wax or animal wax having a melting point in the range of 50° C. to 100° C., more preferably a wax having a melting point in the range of 60° C. to 90° C. By having a melting point in the above range, an oil-based solid cosmetic having better shape retention, a higher effect of inhibiting oil stains during use, and an extremely good feel when used can be obtained.

[0015] The melting point of the wax used in the present invention and this embodiment can be measured by "71. Melting Point Measurement Method, Method 2" of the Quasi-Drug Raw Materials Standards 2021. Specifically, it is measured as follows. First, the sample (the wax to be measured for melting point) is melted at a low temperature, and then sucked up to a height of about 10 mm into a capillary tube with a length of about 120 mm open at both ends, and left at 10 ° C or less for 24 hours or ice-cooled for 2 hours or more. Next, the sample is placed in a 250 mL beaker containing water, with the sample attached to an immersion line or fully submerged thermometer so that the sample is located outside the center of the mercury bulb, so that the upper end of the sample is held 10 mm below the water surface. The water in the beaker is heated while constantly stirring, and when it reaches a temperature 5 ° C lower than the expected melting point, it is continued to be heated so that the temperature rises by 1 ° C per minute, and the temperature at which the sample floats up in the capillary tube is the melting point.

[0016] Examples of the vegetable wax having a melting point of 50° C. to 100° C. used as the wax of component (1) include carnauba wax, rice bran wax, candelilla wax, candelilla wax hydrocarbon, sunflower seed wax, hydrogenated jojoba oil, wood wax, etc. Examples of the animal wax having a melting point of 50° C. to 100° C. include beeswax, whale wax, etc., and one or more of these can be used. Of these, the wax of component (1) is preferably one, two or more, three or more, or four or more selected from carnauba wax, rice bran wax, candelilla wax, sunflower seed wax, and beeswax.

[0017] The content of component (1) in the oil-based solid cosmetic of this embodiment is not particularly limited, and can be appropriately set in consideration of the desired quality characteristics of the oil-based solid cosmetic. For example, the content (mass ratio) of component (1) relative to the entire oil-based solid cosmetic is preferably 5 to 30% by mass, more preferably 5% by mass or more and less than 30% by mass, more preferably 10 to 30% by mass, more preferably 10% by mass or more and less than 30% by mass, and even more preferably 14 to 20% by mass. By having the content of component (1) relative to the entire oil-based solid cosmetic within the above range, it becomes easy to obtain an oil-based solid cosmetic that has sufficient hardness and can be applied smoothly.

[0018] (Component (3)) The oligoester of component (3) contained in the oil-based solid cosmetic of this embodiment is an oligoester obtained by an esterification reaction between glycerin as component (A), a divalent carboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms as component (D). The esterification reaction for obtaining the oligoester of component (3) is carried out by esterifying 0.65 to 0.8 moles of the component (B) and 1.2 to 1.7 moles of the total amount of the components (C) and (D) with respect to 1 mole of the component (A). The mass ratio of the components (C) and (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, and preferably, ):component (D)=10:90 to 99:1, more preferably component (C):component (D)=25:75 to 99:1, even more preferably component (C):component (D)=40:60 to 99:1, even more preferably component (C):component (D)=40:60 to 70:30, most preferably component (C):component (D)=50:50 to 70:30, and it is also preferable that component (C):component (D)=10:90 to 70:30. The oligoester of component (3) has an acid value of 5 mgKOH / g or less, preferably 0 to 3 mgKOH / g, and more preferably 0 to 2 mgKOH / g, a saponification value of 420 to 510 mgKOH / g, preferably 420 to 490 mgKOH / g, and more preferably 430 to 490 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less, preferably 0 to 60 mgKOH / g, more preferably 0 to 40 mgKOH / g, even more preferably 0 to 35 mgKOH / g, and even more preferably 0 to 20 mgKOH / g.

[0019] The oligoester of component (3) has the effect of increasing the hardness of an oil-based solid cosmetic preparation (the effect of increasing the hardness of an oil-based solid cosmetic preparation). Therefore, the oil-based solid cosmetic preparation of the present embodiment containing the oligoester has a sufficiently higher hardness and can increase the shape retention compared to an oil-based solid cosmetic preparation not containing the oligoester.

[0020] The oligoester of component (3) is liquid at 20°C. In addition, the oligoester of component (3) has good low-temperature stability and is inhibited from crystallizing even at low temperatures. Therefore, the oil-based solid cosmetic preparation of the present embodiment containing the oligoester is inhibited from crystallizing even at low temperatures and is maintained stably.

[0021] The oligoester of component (3) has excellent pigment dispersibility. Therefore, by adding the oligoester of component (3) to an oil-based solid cosmetic preparation containing a pigment, the dispersibility of the pigment is improved, and the pigment can be uniformly dispersed throughout the oil-based solid cosmetic preparation.

[0022] The oligoester of component (3) contained in the oily solid cosmetic preparation of this embodiment may be one type or two or more types.

[0023] Component (B) used as a raw material for the oligoester of component (3) is a divalent carboxylic acid having 2 to 12 carbon atoms. Examples of divalent carboxylic acids having 2 to 12 carbon atoms include oxalic acid (ethanedioic acid), malonic acid (propanedioic acid), succinic acid (butanedioic acid), glutaric acid (pentanedioic acid), adipic acid (xanedioic acid), pimelic acid (heptanedioic acid), veric acid (octanedioic acid), azelaic acid (nonanedioic acid), sebacic acid (decanedioic acid), phthalic acid (benzene-1,2-dicarboxylic acid), isophthalic acid (benzene-1,3-carboxylic acid), and terephthalic acid (benzene-1,4-dicarboxylic acid). As component (B) used as a raw material for the oligoester of component (3), succinic acid is particularly preferred from the viewpoint of further improving hardness.

[0024] Component (C) used as a raw material for the oligoester of component (3) is one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid. Caprylic acid is particularly preferred as component (C) used as a raw material for the oligoester of component (3). In addition, the oligoester of component (3) has better color and odor than oligoesters obtained by esterification of unsaturated fatty acids with components (A) and (B).

[0025] Component (D), which is used as a raw material for the oligoester of component (3), is one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms. Specific examples of such fatty acids include capric acid (n-decanoic acid), lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. Capric acid is particularly preferred as component (D), which is used as a raw material for the oligoester of component (3).

[0026] The acid value of the oligoester of component (3) is 5 mgKOH / g or less (0 to 5 mgKOH / g). If the acid value is higher than 5 mgKOH / g, odor may be generated. Since the oligoester of component (3) has an acid value of 5 mgKOH / g or less, it does not have a particular odor. Therefore, the oil-based solid cosmetic preparation of this embodiment can have excellent shape retention due to the oligoester of component (3) without impairing the desired fragrance quality. The acid value of the oligoester of component (3) can be adjusted to fall within the above range by sampling the reaction product during the esterification reaction, measuring its acid value, and terminating the esterification reaction when the desired acid value is reached. The acid value of the oligoester of component (3) is 5 mgKOH / g or less, preferably from 0 to 3 mgKOH / g, and more preferably from 0 to 2 mgKOH / g.

[0027] The saponification value of the oligoester of component (3) is 420 to 510 mgKOH / g, preferably 420 to 490 mgKOH / g, and more preferably 430 to 490 mgKOH / g. When the saponification value is within the above range, the oligoester exerts a hardness improving effect. The saponification value of the oligoester of component (3) can be adjusted by the amount of the oligoester used in the esterification reaction.

[0028] The hydroxyl value of the oligoester of component (3) is 60 mgKOH / g or less, preferably 0 to 60 mgKOH / g, more preferably 0 to 40 mgKOH / g, even more preferably 0 to 35 mgKOH / g, and even more preferably 0 to 20 mgKOH / g. If the hydroxyl value is too high, the wax solubility may be poor. By having a hydroxyl value of 60 mgKOH / g or less, the oligoester of component (3) has good wax solubility. The hydroxyl value of the oligoester of component (3) can be adjusted by the amount of the component (3) used in the esterification reaction.

[0029] Each of these components (A) to (D) can be a commercially available product. Glycerin and linear saturated fatty acids derived from plants are generally available, and succinic acid is also mass-produced industrially by fermentation. Therefore, by using succinic acid as component (B), the oligoester of component (3) can be produced with a combination of inexpensive raw materials. In particular, from the viewpoint of environmental impact and sustainability of supply, it is preferable to use glycerin as component (A), succinic acid as component (B), caprylic acid, which is a linear saturated fatty acid, as component (C), and capric acid as component (D) as raw materials for the oligoester of component (3).

[0030] The degree of crosslinking and side chains of the oligoester of component (3) can be adjusted by changing the amount of raw materials charged in the esterification reaction to obtain an oligoester having various effects. Specifically, the degree of crosslinking of the oligoester of component (3) obtained can be adjusted by changing the amount of components (A) and (B) charged. In addition, the degree of crosslinking and the number of added side chains can be adjusted by changing the amount of fatty acid charged as component (C).

[0031] In the esterification reaction for producing the oligoester of component (3), 0.65 to 0.8 moles of component (B) and 1.2 to 1.7 moles of the total amount of components (C) and (D) are esterified with respect to 1 mole of component (A). The mass ratio of component (C) to component (D) is component (C): component (D) = 10:90 to 99.9: 0.1, preferably component (C): component (D) = 10:90 to 99: 1, more preferably component (C): component (D) = 25:75 to 99: 1, even more preferably component (C): component (D) = 40:60 to 99: 1, even more preferably component (C): component (D) = 40:60 to 70:30, most preferably component (C): component (D) = 50:50 to 70:30, and also preferably component (C): component (D) = 10:90 to 70:30.

[0032] If the amount of component (B) charged per mole of component (A) is less than 0.65 moles, the resulting oligoester may not have the effect of improving the hardness of the oil-based solid cosmetic preparation. On the other hand, if more than 0.8 moles of component (B) are used, crosslinking between components (A) and (B) may proceed too far, causing the resulting oligoester to become cloudy.

[0033] If the amount of component (C) charged per mole of component (A) exceeds 1.7 moles, transesterification may occur and synthesis may not proceed to the desired degree of crosslinking. On the other hand, if the amount of component (C) charged is less than 1.2 moles, the amount of unreacted hydroxyl groups increases, and the wax solubility of the obtained oligoester may be poor.

[0034] The mass ratio of the components (C) and (D) is 10:90 to 99.9:0.1, preferably 10:90 to 99:1, more preferably 25:75 to 99:1, even more preferably 40:60 to 99:1, even more preferably 40:60 to 70:30, most preferably 50:50 to 70:30, and also preferably 10:90 to 70:30. In the mass ratio of the components (C) and (D), the mass ratio of the component (D) ([mass of the component (D)] / ([mass of the component (C)]+[mass of the component (D)])) may be less than 0.1. On the other hand, in the mass ratio of the charged components (C) and (D), if the mass ratio of component (C) ([mass of component (C)] / ([mass of component (C)]+[mass of component (D)])) is 8 or less (component (C):component (D)=8:92), the obtained oligoester is prone to crystallization in a low-temperature environment and has poor low-temperature stability, which is not preferable.

[0035] The oligoester of component (3) can be prepared by, for example, charging 0.65 to 0.8 moles of component (B) and 1.2 to 1.7 moles of the total amount of components (C) and (D) per mole of component (A), and reacting at a temperature of 180 to 240°C without or in the presence of a catalyst. As the catalyst, for example, an acid, an alkali, or other catalysts known per se in the field of organic chemistry, which are used in the esterification reaction of alcohol and fatty acid, can be applied. The esterification reaction can be carried out in a solvent that does not adversely affect the esterification of alcohol and fatty acid, or can be carried out without a solvent. As the solvent, a solvent known per se in the field of organic chemistry, which is used in the esterification reaction of alcohol and fatty acid, can be applied.

[0036] The reaction time for the esterification reaction to produce the oligoester of component (3) can usually be 20 to 30 hours. The reaction time may be 20 hours or less or 30 hours or more, depending on the raw material used (straight-chain or branched), the presence or absence of a catalyst, the esterification temperature, the amount of excess acid, etc. After the reaction is completed, if a catalyst is used, it may be removed by filtration, adsorption, or the like.

[0037] By subjecting the components (A) to (D) to an esterification reaction, a reaction product containing the oligoester of the component (3) can be obtained. By subjecting the reaction product to a purification treatment by a conventional method, a purified oligoester can be obtained. For example, the reaction product of the esterification reaction can be purified by removing excess unreacted raw materials by distillation. In addition, when it is desired to improve the color of the esterified product, the color can be improved by decolorization treatment by a conventional method.

[0038] The content of component (3) in the oil-based solid cosmetic of this embodiment is not particularly limited as long as it is an amount that exhibits the hardness-improving effect of the oligoester of component (3). For example, the content of component (3) relative to the entire oil-based solid cosmetic is preferably 10 to 90% by mass, more preferably 20 to 90% by mass, and even more preferably 20 to 60% by mass.

[0039] (Component (2)) The oil-based solid cosmetic preparation of the present embodiment may contain, in addition to components (1) and (3), an oil-based component that is liquid or pasty at 20°C as component (2). When component (2) is contained, the oily component of said component (2) is not particularly limited as long as it is an oily substance other than component (3), and can be appropriately selected from various oily components that are generally blended into cosmetics and are liquid or pasty at 20° C. The oily component of said component (2) contained in the oil-based solid cosmetic of this embodiment may be one type, or two or more types.

[0040] Examples of the oily component (2) that is liquid or pasty at 20°C include hydrocarbons, fatty acid esters, triglycerides, fatty acids, higher alcohols, silicone oils, fluorine-based oils, and derivatives thereof, and one or more of these can be used.Specifically, castor oil, olive oil, avocado oil, palm oil, cocoa oil, liquid paraffin, liquid branched paraffin, petrolatum, squalane, hydrogenated polyisobutene, hydrogenated polydecene, dicaprylic / capric acid propanediol, neopentyl glycol dicaprate, polyglyceryl-6 octacaprylate, tricaprylic / capric acid glyceryl, triethylhexanoin, butyl stearate, ethylhexyl palmitate, coconut alkyl caprylate, caprylyl caprylate, myristyl oleate, glyceryl oleate, caprylic / capric acid glyceryl ... Octyldodecyl acrylate, isopropyl myristate, isopropyl lanolate, hexyl lanolate, diisopropyl adipate, diisopropyl sebacate, isotridecyl isononanoate, isononyl isononanoate, polyglyceryl decaisostearate, 2-octyldodecanol, diisostearyl malate, polyglyceryl-2 triisostearate, polyglyceryl-2 diisostearate, dipentaerythrityl pentaisostearate, dipentaerythrityl tetraisostearate, tetraisostearin Pentaerythrityl Triisostearate, Trimethylolpropane Triisostearate, Dipentaerythrityl Hexa(hydroxystearic acid / hexastearic acid / hexarosin acid), Cholesteryl Hydroxystearate, Phytosteryl Macadamia Nut Oil Fatty Acid, Bis(behenyl / isostearyl / phytosteryl) Dimer Dilinoleyl Dimer Dilinoleate, Phytosteryl / octyldodecyl / behenyl Lauroyl Glutamate, Glyceryl Ethylhexanoate / stearic acid / adipic acid, Oleyl Alcohol, Dimethylpolysiloxane Examples of suitable oils include ethylhexyl stearate, methylphenylpolysiloxane, dimethylcyclopolysiloxane, methylhydrogenpolysiloxane, perfluoropolyether, di(phytosteryl / octyldodecyl) lauroyl glutamate, dipentaerythrityl hexahydroxystearate, dipentaerythrityl tetra(hydroxystearate / isostearate), dipentaerythrityl tripolyhydroxystearate, mineral oil, cetyl ethylhexanoate, phenyl trimethicone, cyclopentasiloxane, and isododecane.

[0041] The oil-based component (2) contained in the oil-based solid cosmetic preparation of this embodiment is one or more selected from the following: castor oil, diisostearyl malate, polyglyceryl-2 triisostearate, polyglyceryl-10 decaisostearate, tri(caprylic acid / capric acid)glyceryl, macadamia seed oil, ethylhexanoate / stearic acid / adipic acid glyceryl, and di(caprylic acid / capric acid)propanediol. It is preferable to use one or more selected from polyglyceryl-2 triisostearate, polyglyceryl-10 decaisostearate, tri(caprylic acid / capric acid), and macadamia seed oil, and it is more preferable to use one or more selected from polyglyceryl-2 triisostearate, polyglyceryl-10 decaisostearate, tri(caprylic acid / capric acid), and macadamia seed oil, and it is even more preferable to use one or more selected from polyglyceryl-2 triisostearate, polyglyceryl-10 decaisostearate, tri(caprylic acid / capric acid), and macadamia seed oil.

[0042] The content of component (2) in the oil-based solid cosmetic of this embodiment is not particularly limited as long as it is an amount that exhibits the hardness-improving effect of the oligoester of component (3), and can be appropriately set in consideration of the desired quality characteristics of the oil-based solid cosmetic. When the oil-based solid cosmetic of this embodiment contains component (2), for example, the content of component (2) relative to the entire oil-based solid cosmetic is preferably more than 0% by mass and not more than 60% by mass, more preferably more than 0% by mass and not more than 50% by mass, and even more preferably more than 0% by mass and not more than 40% by mass.

[0043] (Component (4)) The oil-based solid cosmetic preparation of the present embodiment may contain the following component (4) in addition to components (1) and (3), or in addition to components (1), (2) and (3), or in addition to components (1), (2), (3) and an ultraviolet absorbing agent described below. These alcohols are alcohols that are generally added to cosmetics as preservatives. Component (4): One or more selected from the group consisting of 1,2-hexanediol, caprylyl glycol, ethylhexylglycerin, and phenoxyethanol.

[0044] The content of component (4) in the oil-based solid cosmetic of this embodiment is not particularly limited as long as it is an amount that exhibits the hardness-improving effect of the oligoester of component (3), and can be appropriately set in consideration of the desired quality characteristics of the oil-based solid cosmetic. For example, the content of component (4) relative to the entire oil-based solid cosmetic is preferably more than 0% by mass and not more than 5.0% by mass, more preferably more than 0% by mass and not more than 2.0% by mass, and even more preferably more than 0% by mass and not more than 1.0% by mass.

[0045] In the oil-based solid cosmetic of this embodiment, the content of component (1) relative to the entire oil-based solid cosmetic is 5 to 30% by mass, preferably 10 to 30% by mass, and more preferably 14 to 20% by mass; the content of component (2) relative to the entire oil-based solid cosmetic is 0 to 60% by mass, preferably 0 to 50% by mass, and more preferably 0 to 40% by mass; and the content of component (3) relative to the entire oil-based solid cosmetic is 10 to 90% by mass, preferably 20 to 90% by mass, and more preferably 20 to 60% by mass; An oil-based solid cosmetic is preferred in which the mass ratio of component (3) to the total amount of components (2) and (3) ([content (mass) of component (3)] / ([content (mass) of component (2)]+[content (mass) of component (3)]) is 0.2 to 1.0; and the content of component (4) relative to the entire oil-based solid cosmetic is 0 to 5.0 mass%, preferably 0 to 2.0 mass%, and more preferably 0 to 1.0 mass%. Note that "the content of component (X) is 0 mass%" means that component (X) is not contained.

[0046] (UV absorber) The oily solid cosmetic preparation of the present embodiment preferably contains an ultraviolet absorber in addition to components (1) and (3), or in addition to components (1), (2), and (3), or in addition to components (1), (2), (3), and (4).

[0047] Examples of the ultraviolet absorbing agent contained in the oil-based solid cosmetic composition of the present embodiment include, but are not limited to, benzoic acid-based ultraviolet absorbing agents such as para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, and N,N-dimethyl PABA ethyl ester; anthranilic acid-based ultraviolet absorbing agents such as homomenthyl-N-acetylanthranilate; amyl salicylic acid-based ultraviolet absorbing agents such as benzoic ... salicylic acid-based ultraviolet absorbers such as salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate; octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxy cinnamate, isopropyl p-methoxy cinnamate, isoamyl p-methoxy cinnamate, cinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-paramethoxycinnamate, and other cinnamic acid-based ultraviolet absorbers; 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydro benzophenone-based ultraviolet absorbers such as 2-hydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, and 4-hydroxy-3-carboxybenzophenone;3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3 ,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)1,3,5-triazine, 4-tent-butyl-4'-methoxydibenzoylmethane, ethylaminohydroxybenzoylhexyl benzoate, ethylhexyl triazine, t-butyl methoxydibenzoylmethane, bisethylhexyloxyphenol methoxyphenyl triazine, diethylhexylbutamidotriazone, oxybenzone-3, etc. The ultraviolet absorber may be used alone or in combination of two or more kinds.;

[0048] The content of the ultraviolet absorber in the oil-based solid cosmetic of this embodiment is not particularly limited as long as it is an amount that exhibits the hardness-improving effect of the oligoester of component (3), and can be appropriately set in consideration of the desired quality characteristics of the oil-based solid cosmetic. For example, the content of the ultraviolet absorber in the entire oil-based solid cosmetic is preferably more than 0% by mass and not more than 5.0% by mass, more preferably more than 0% by mass and not more than 2.0% by mass, and even more preferably more than 0% by mass and not more than 1.0% by mass.

[0049] (powder) The oil-based solid cosmetic of the present embodiment may contain a powder in addition to components (1) and (3), or in addition to components (1), (2), and (3), or in addition to components (1), (2), (3), and (4). Since the oligoester of component (3) has good pigment dispersibility, by blending a powder with the oil-based solid cosmetic of the present embodiment, an oil-based solid cosmetic in which the powder is uniformly dispersed throughout the cosmetic can be obtained.

[0050] As the powder, extender pigments, color pigments, and pearl pigments can be used.

[0051] Examples of the extender pigment include inorganic pigments such as silicic acid, silicic anhydride, magnesium silicate, talc, sericite, mica, kaolin, clay, bentonite, bismuth oxychloride, zirconium oxide, magnesium oxide, zinc oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, and composite powders thereof; organic powders such as polyamide, polyester, polypropylene, polystyrene, polyurethane, nylon, silicone resin, vinyl resin, urea resin, phenolic resin, silicone resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene-styrene copolymer, silk powder, cellulose, Nε-lauroyl-L-lysine, long-chain alkyl phosphate metal salt, N-mono long-chain alkyl acyl basic amino acid, metal soap, and composite powders thereof; and composite powders of the above inorganic powders and organic powders. The particle shape of these powders may be any shape such as spherical, plate-like, needle-like, granular, and irregular.

[0052] Examples of coloring pigments include metal oxides such as titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, black iron oxide, Prussian blue, ultramarine, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; inorganic pigments such as carbon black; organic pigments such as tar-based dyes and lake pigments; and natural pigments such as carmine.

[0053] As the pearl pigment, there can be used pearl pigments in which mica, synthetic phlogopite, etc. are coated with colorants such as titanium oxide, iron oxide, silicon oxide, Prussian blue, chromium oxide, carmine, organic pigments, etc. These powders may be subjected to various surface treatments such as water repellency and water / oil repellency by conventional methods before use.

[0054] By incorporating a powder having an ultraviolet shielding effect, such as a metal oxide powder, a sunscreen cosmetic (a cosmetic for preventing sunburn) can also be produced. The metal oxide powder having an ultraviolet shielding effect is not particularly limited, and examples thereof include titanium oxide, zinc oxide, zirconium oxide, and cerium oxide, and one or more of these can be used.

[0055] The shape of the metal oxide powder having the ultraviolet shielding effect is not particularly limited, and examples thereof include spherical, needle-like, spindle-like, plate-like, and flaky shapes. In order to reduce the surface activity, the powder may be treated with an inorganic compound such as silica or alumina. In addition, it is more preferable that the average particle size of the metal oxide powder is 10 to 100 nm, since white cast is suppressed when the powder is applied to the skin.

[0056] The oil-based solid cosmetic of the present embodiment may contain one type of powder or two or more types. The content of the powder in the oil-based solid cosmetic of the present embodiment is not particularly limited as long as the hardness improving effect of the oligoester of component (3) is exhibited, and can be appropriately set in consideration of the desired quality characteristics of the oil-based solid cosmetic. For example, the content of the powder relative to the entire oil-based solid cosmetic (total mass) is preferably 0 to 50 mass%, more preferably 0 to 40 mass%, and even more preferably 0 to 30 mass%.

[0057] (Other additives) The oil-based solid cosmetic of the present embodiment may contain additives other than components (1) to (4), UV absorbers, and powders, so long as the effect of the oligoester of component (3) is not impaired. As the additives, one or more of known additives used as additives for cosmetics, sanitary products, medicines, etc. may be appropriately selected and used. Specifically, the additives include gelling agents (excluding component (1)), surfactants, antioxidants, antioxidant assistants, preservatives, alcohols (excluding component (4)), water-soluble polymers, pH adjusters, inorganic salts or organic acid salts, chelating agents, vitamins, organic solvents, fragrances, various extracts, UV scattering agents, etc.

[0058] The gelling agent contained in the oil-based solid cosmetic preparation of this embodiment may be behenyl behenate, glyceryl tribehenate, dextrin ethylhexanoate, dextrin palmitate, dextrin myristate, dextrin isostearate, inulin palmitate, inulin stearate, higher fatty acids, metal soaps of higher fatty acids, silica silylate, dibutyl ethylhexanoyl glutamide, dibutyl lauroyl glutamide, etc., and may be used alone or in combination of two or more.

[0059] The surfactant contained in the oily solid cosmetic preparation of the present embodiment may be a nonionic surfactant, anionic surfactant, cationic surfactant, amphoteric surfactant, or the like, which may be used alone or in combination of two or more kinds.

[0060] Examples of nonionic surfactants include monoglycerides, sorbitan fatty acid esters, sucrose fatty acid esters, polyglycerin fatty acid esters, alkanolamides, amine oxides, polyoxyethylene alkyl ethers, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol mono fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, alkyl saccharides, α-monoalkylglyceryl ethers, dimethylpolysiloxane-polyoxyalkylene copolymers, dimethylpolysiloxane-monoalkylglyceryl ether copolymers, and sorbitan sesquiisostearate.

[0061] Examples of the anionic surfactant include alkylbenzene sulfonates, alkylnaphthalene sulfonates, polyoxyethylene alkyl ether sulfates, and polyoxyethylene lauryl ether phosphates.

[0062] Examples of the cationic surfactant include primary, secondary and tertiary amine salts and quaternary ammonium salts having an aliphatic hydrocarbon group.

[0063] Examples of amphoteric surfactants include sodium β-laurylaminopropionate, lauryl dimethylaminoacetic acid betaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine.

[0064] Other surfactants that may be used include lecithins, soybean saponin, etc. Examples of lecithins include lecithin, hydrogenated lecithin, hydroxide lecithin, lysolecithin, hydrogenated lysolecithin, etc. Examples of hydrogenated lecithin include hydrogenated soybean phospholipid, hydrogenated rapeseed phospholipid, hydrogenated egg yolk phospholipid, etc.

[0065] As the surfactant contained in the oil-based solid cosmetic preparation of the present embodiment, nonionic surfactants such as polyoxyethylene-modified silicone, polyglycerin fatty acid ester, polyoxyethylene alkyl, polyoxyethylene fatty acid ester, and polyoxyethylene hydrogenated castor oil are preferable.

[0066] The antioxidant contained in the oil-based solid cosmetic of the present embodiment is not particularly limited, and examples thereof include oil-soluble vitamin C derivatives, tocopherols and their derivatives and salts, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters, etc. One type of antioxidant may be used alone, or two or more types may be used in combination.

[0067] The antioxidant aid contained in the oil-based solid cosmetic preparation of the present embodiment is not particularly limited, and examples thereof include phosphoric acid, citric acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, ethylenediaminetetraacetic acid, etc. The antioxidant aid may be used alone or in combination of two or more kinds.

[0068] The preservative contained in the oily solid cosmetic preparation of the present embodiment is not particularly limited, and examples thereof include methylparaben, ethylparaben, butylparaben, etc. The preservative may be used alone or in combination of two or more kinds.

[0069] The alcohol contained in the oily solid cosmetic preparation of the present embodiment is not particularly limited, and may be a monohydric alcohol or a polyhydric alcohol.

[0070] The monohydric alcohol may be a lower alcohol or a higher alcohol. Examples of the lower alcohol include methanol, ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol. Examples of the higher alcohol include cetanol (cetyl alcohol, palmityl alcohol), stearyl alcohol (octadecyl alcohol), isostearyl alcohol (isooctadecanol), oleyl alcohol, cetostearyl alcohol, octyldodecanol, decyltetradecanol, hexyldecanol, behenyl alcohol, lauryl alcohol, lanolin alcohol, and hydrogenated lanolin alcohol. The monohydric alcohol may be used alone or in combination of two or more.

[0071] Examples of polyhydric alcohols include propylene glycol (1,2-propanediol), 1,3-propanediol, 1,3-butylene glycol (1,3-butanediol), pentylene glycol (1,2-pentanediol), neopentylene glycol (2,2-dimethyl-1,3-propanediol), isoprene glycol (3-methyl-1,3-butanediol), dipropylene glycol, glycerin, diglycerin, polyglycerin, polyethylene glycol, pentaerythritol, dipentaerythritol, sorbitol, sorbitan, etc. As the polyhydric alcohols, one type may be used alone, or two or more types may be used in combination.

[0072] The water-soluble thickener may be a natural water-soluble polymer, a semi-synthetic water-soluble polymer, or a synthetic water-soluble polymer. The water-soluble thickener contained in the oil-based solid cosmetic preparation of the present embodiment may be used alone or in combination of two or more kinds.

[0073] Examples of natural water-soluble polymers include plant-based polymers such as agar, glucomannan, gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, quince seed, algae colloid (cassow extract), and starch (rice, corn, potato, and wheat); microbial polymers such as xanthan gum, dextran, succinoglucan, and pullulan; and animal-based polymers such as collagen, casein, albumin, and gelatin.

[0074] Examples of semi-synthetic water-soluble polymers include starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; cellulose-based polymers such as methyl cellulose, nitrocellulose, methylhydroxypropyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose and cellulose powder; and alginic acid-based polymers such as sodium alginate and propylene glycol alginate.

[0075] Examples of synthetic water-soluble polymers include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymers; polyoxyethylene polymers such as polyethylene glycol 20,000, 40,000, and 60,000; polyoxyethylene-polyoxypropylene copolymer polymers; acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylamide; polyethyleneimine; and cationic polymers.

[0076] Examples of pH adjusters include edetic acid, disodium edetate, citric acid, sodium citrate, sodium hydroxide, potassium hydroxide, triethanolamine, etc. The pH adjusters may be used alone or in combination of two or more.

[0077] Examples of inorganic salts include sodium chloride, potassium chloride, magnesium chloride, sodium sulfate, potassium sulfate, magnesium sulfate, etc. Examples of organic acid salts include citric acid, malic acid, tartaric acid, and salts thereof, ascorbic acid and salts thereof, and ascorbic acid derivatives and salts thereof.

[0078] Examples of the chelating agent include disodium edetate, edetate salts, hydroxyethanediphosphonic acid, etc. The chelating agents may be used alone or in combination of two or more kinds.

[0079] Examples of vitamins include vitamin A, vitamin B1, vitamin B2, vitamin B6, vitamin E, vitamin K and derivatives thereof, pantothenic acid and derivatives thereof, biotin, etc.

[0080] Examples of extracts include plant extracts such as aloe vera, witch hazel, hamamelis, cucumber, lemon, lavender, and rose.

[0081] (Method of manufacturing oil-based solid cosmetic products) The oil-based solid cosmetic preparation of this embodiment can be produced, for example, by heating and mixing the oligoester (3), the wax (1), and other ingredients until homogeneous, and then filling the resulting liquid or paste-like mixture into a container for forming into the desired shape and cooling it. The raw material ingredients may be mixed all at once or sequentially. The oil-based solid cosmetic preparation of this embodiment containing component (2) can be produced, for example, by heating and mixing the oligoester (3), the wax (1), the oil component (2), and other components until homogeneous, and then filling the resulting liquid or paste-like mixture into a container for forming the desired shape and cooling it. The raw material components may be mixed all at once or sequentially.

[0082] The shape of the oil-based solid cosmetic preparation of the present embodiment is not particularly limited, and it can be molded into various shapes, such as a rod shape, a plate shape, or a shape formed by pouring into a dish-shaped object.

[0083] The oil-based solid cosmetic of the present embodiment is not particularly limited, and examples thereof include makeup cosmetics such as lipstick, foundation, concealer, blusher, eyebrow cream, eyeshadow, eyeliner, etc.; body care cosmetics such as UV care products, deodorant products, body skin care products, body fragrance products, and body cleansing products; cleansing products such as cleansing balms, whitening cosmetics, UV care cosmetics, anti-aging products, skin care cosmetics such as skin care balms; hair care cosmetics such as hair styling wax, hair tics, hair treatment agents, one-day hair color agents, and hair gloss; fragrance cosmetics such as perfume, eau de toilette, eau de cologne, eau de parfum, and stick-type solid perfume; topical skin preparations such as ointments and sunscreens. In addition to lipstick, lip cosmetics can also be undercoat cosmetics and finishing gloss cosmetics called lip creams, lip glosses, lip colors, etc. The oil-based solid cosmetic of this embodiment is particularly preferably a stick-type cosmetic such as lipstick or lip gloss, because these have excellent shape retention.

[0084] <Hardness enhancer> The oligoester of component (3) can improve the hardness of an oil-based solid cosmetic preparation containing one or more waxes selected from the above-mentioned vegetable waxes that are solid at 25° C. and animal waxes that are solid at 25° C. For this reason, the oligoester of component (3) can be used as a hardness enhancer for oil-based solid cosmetic preparations. Furthermore, even when an oil-based solid cosmetic contains the above-mentioned oily component that is liquid or pasty at 20° C., the hardness can be improved by blending the oligoester of component (3). Therefore, the oligoester of component (3) can be used as a hardness enhancer for an oil-based solid cosmetic containing one or more waxes selected from the above-mentioned vegetable waxes that are solid at 25° C. and animal waxes that are solid at 25° C., and the above-mentioned oily component that is liquid or pasty at 20° C.

[0085] That is, the hardness enhancer of the present embodiment is a hardness enhancer that enhances the hardness of an oil-based solid cosmetic preparation, and comprises an oligoester obtained by an esterification reaction between glycerin as component (A), a divalent carboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms as component (D). The esterification reaction is an esterification reaction of 0.65 to 0.8 moles of the component (B) and 1.2 to 1.7 moles of the total amount of the component (C) and the component (D) per mole of the component (A). The mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C):component (D)=10:90 to 99.9:0.1, and preferably component (C):component (D)=10:90 to 99.9:0.1. The ratio is preferably 0:90 to 99:1, more preferably 25:75 to 99:1, even more preferably 40:60 to 99:1, even more preferably 40:60 to 70:30, and most preferably 50:50 to 70:30. It is also preferable that the ratio is 10:90 to 70:30. The oligoester has an acid value of 5 mgKOH / g or less, a saponification value of 420 to 510 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less. The hardness enhancer of the present embodiment enhances the hardness of an oil-based solid cosmetic containing one or more waxes selected from a vegetable wax that is solid at 25°C and an animal wax that is solid at 25°C.

[0086] Components (A) to (D) and the reaction conditions for the esterification reaction thereof are the same as those for the oligoester of component (3).

[0087] By mixing the hardness enhancer of this embodiment with an oil-based solid cosmetic containing one or more waxes selected from vegetable waxes that are solid at 25° C. and animal waxes that are solid at 25° C., the hardness of the resulting oil-based solid cosmetic can be made higher than the hardness of an oil-based solid cosmetic obtained by mixing castor oil with an oil-based solid cosmetic of the same composition. The vegetable waxes that are solid at 25° C. and the animal waxes that are solid at 25° C. can be the same as those listed for component (1) above. Furthermore, by mixing the hardness enhancer of this embodiment with an oil-based solid cosmetic containing one or more waxes selected from vegetable waxes that are solid at 25° C. and animal waxes that are solid at 25° C., and an oil-based component that is liquid or pasty at 20° C., the hardness of the resulting oil-based solid cosmetic can be made higher than the hardness of an oil-based solid cosmetic obtained by mixing castor oil with an oil-based solid cosmetic of the same composition. The vegetable waxes that are solid at 25° C. and the animal waxes that are solid at 25° C. can be the same as those listed in component (1) above, and the oil-based component that is liquid or pasty at 20° C. can be the same as those listed in component (2) above. EXAMPLES

[0088] The present invention will be described in more detail below with reference to examples. It goes without saying that the scope of the present invention is not limited to such examples. In the following examples, parts and % represent parts by mass and % by mass, respectively, unless otherwise specified.

[0089] In the following experiments, the acid value, saponification value, and hydroxyl value of the esterification reaction products were measured in accordance with the Standards for Quasi-Drug Ingredients 2006.

[0090] In the following experiments, the waxes (vegetable waxes that are solid at 25° C. or animal waxes that are solid at 25° C.) as component (1) and the oily components (oily components that are liquid or pasty at 20° C.) as component (2) that are used relatively frequently are shown in Table 1. For components (1) and (2) not shown in Table 1, their product names, manufacturers, or distributors are listed in each example.

[0091] [Table 1]

[0092] [Synthesis Example 1] Production of oligoester In a 1L four-neck flask equipped with a stirrer, a thermometer, a nitrogen gas inlet tube, and a water separator, 191.9g of glycerin, 172.3g of succinic acid (purity: 99.5%, product name "succinic acid", Fujifilm Wako Pure Chemical Industries, Ltd.), 291.5g of caprylic acid (purity: 99% by mass or more, product name "PALMAC99-08", IOI Acidchem), and 194.3g of capric acid (purity: 99% by mass or more, product name "PALMAC99-10", IOI Acidchem) were charged, and the mixture was heated to 230-240°C under a nitrogen stream, and an esterification reaction was carried out for about 20 hours while removing the generated water. After the reaction was completed, the excess acid was removed, and the target esterified product, oligoester ((caprylic acid / capric acid / succinic acid) triglyceryl), was obtained. The resulting oligoester had an acid value of 0.7 mgKOH / g, a saponification value of 461, and a hydroxyl value of 6.3 mgKOH / g.

[0093] [Synthesis Examples 2 to 4] Preparation of oligoesters Using the molar amounts and charged amounts shown in Table 2, esterification reactions were carried out in the same manner as in the production of the oligoester in Synthesis Example 1, to produce the oligoesters in Synthesis Examples 2 to 4.

[0094] [Table 2]

[0095] <Evaluation of oligoesters> The oxidation stability of the oligoester synthesized in Synthesis Example 1 was evaluated by a CDM test (Standard Fats and Oils Test Method: 120°C, Air: 20L / h). In the test, the conductivity was measured over time using a Rancimat 743 (Metrohm) device to evaluate the oxidation stability. In the CDM test, the time to the inflection point where the conductivity increases rapidly over time (induction time) is measured. The longer the induction time, the better the oxidation stability, and the one that does not show a large increase in conductivity has the best oxidation stability.

[0096] [Table 3]

[0097] The evaluation results are shown in Table 3. The oligoester of Synthesis Example 1 was superior in oxidation stability to castor oil and diisostearyl malate. In addition, the oligoester of Synthesis Example 1 showed no change in color before and after the test, and the change in odor was also slight. Castor oil showed a yellowing of color before and after the test, and emitted a deterioration odor, so it was clearly inferior in oxidation stability.

[0098] [Examples 1 to 9, Comparative Examples 1 to 7] Oil-based solid cosmetic preparations were produced according to the formulations shown in Tables 5 and 6, and a test of the solidification ability was carried out when combined with a vegetable wax or an animal wax.

[0099] <Manufacture of oil-based solid cosmetics> Based on the formulations in Tables 5 and 6, all of the raw ingredients were mixed and stirred at a heated state of 90°C, poured into a polypropylene container (diameter 36 mm, depth 11 mm), and cooled to room temperature to produce a cylindrical oil-based solid cosmetic preparation.

[0100] <Hardness evaluation> Using a gel hardness tester (product name "Small tabletop tester EZ-Test EZ-SX", manufactured by Shimadzu Corporation), a flat plunger with a diameter of 3 mm was pressed 0.4 mm into the oil-based solid cosmetic in the polycarbonate container after it had been left to stand overnight in a thermostatic chamber at 20°C, and the maximum stress (gf) was recorded as the hardness.

[0101] <Evaluation of hardness improvement effect> The hardness of oil-based solid cosmetics varies depending on the plant-based wax or animal-based wax used. Therefore, the hardness-improving effect of the oligoesters added to the manufactured oil-based solid cosmetics was evaluated by measuring the hardness of oil-based solid cosmetics made with castor oil and various plant-based waxes or animal-based waxes, and calculating the relative hardness value with the hardness set to 1.

[0102] The hardness improvement effect was evaluated according to the following evaluation criteria. When the evaluation was a or b, it was determined that the hardness improvement effect was high.

[0103] Evaluation criteria for hardness improvement effect a: Relative hardness value is 1.05 or more. b: Relative hardness value is 0.95 or more and less than 1.05. c: Relative hardness value is less than 0.95.

[0104] The hardness (gf) (basic data) of oil-based solid cosmetic products used as the standard for the hardness improvement effect is shown in Table 4.

[0105] [Table 4]

[0106] <Evaluation of oil stains> The oily stains of the produced oil-based solid cosmetics were evaluated. Specifically, the measurement sample was pressed with the index finger, and the liquid oil was evaluated to see if it seeped out around the area where the pressure was applied. Products that seeped out liquid oil when pressed tend to cause a poor feeling when used and makeup to come off. Products that received an evaluation of a or b were judged to have a high effect of suppressing oil stains.

[0107] Evaluation criteria for oil stains a: Liquid oil does not leak out even when pressurized. b: A small amount of liquid oil seeps out when pressurized. c: Liquid oil visibly leaks out when pressurized.

[0108] [Table 5]

[0109] [Table 6]

[0110] The evaluation results of each oil-based solid cosmetic preparation are shown in Tables 5 and 6. The oil-based solid cosmetic preparations prepared using the oligoesters of Synthesis Examples 1 to 3 and vegetable or animal waxes had a good hardness-improving effect and were less susceptible to oil staining. It was previously known that castor oil could be combined with vegetable or animal wax to produce an oil-based solid cosmetic preparation with high hardness and good shape retention, but the oligoesters of Synthesis Examples 1 to 3 demonstrated performance that exceeded this (Examples 1 to 9).

[0111] On the other hand, the relative hardness values ​​of the oil-based solid cosmetic compositions in which diisostearyl malate was blended instead of the oligoester of Synthesis Example 1 were all less than 1. Blending diisostearyl malate did not have any effect on improving hardness, and when combined with rice bran wax, beeswax, etc., the hardness was extremely low (Comparative Examples 1 to 5).

[0112] In addition, the relative hardness values ​​of oil-based solid cosmetics in which the oligoester of Synthesis Example 4 corresponding to component (2) was blended instead of the oligoester of Synthesis Example 1 and candelilla wax or beeswax was used as the wax were all less than 1, and the blending of the oligoester of Synthesis Example 4 did not have any effect on improving hardness (Comparative Examples 6 and 7).

[0113] [Examples 10 to 27, Comparative Examples 8 to 10] Lip balm Using the oligoesters of Synthesis Examples 1 to 3, lip creams, which are oil-based solid cosmetics, were produced.

[0114] <Manufacture of lip balm> Based on the recipes in Tables 7 to 10, all the raw ingredients were mixed at 90°C, poured into a polypropylene container (diameter 36 mm, depth 11 mm), and cooled to room temperature to produce a cylindrical lip balm. The cylindrical lip balm was used for hardness measurement and oil stain evaluation.

[0115] <Hardness evaluation> Using a gel hardness tester (product name: "Small tabletop tester EZ-Test EZ-SX", manufactured by Shimadzu Corporation), a flat plunger with a diameter of 3 mm was pressed 0.4 mm into the cylindrical lip balm in the polycarbonate container after it had been left overnight in a thermostatic chamber at 20°C. The maximum stress (gf) felt when this was done was recorded as the hardness of the lip balm.

[0116] The hardness was evaluated according to the following evaluation criteria. When the evaluation was a, b, or c, it was determined that the hardness was sufficiently high and the shape retention was high.

[0117] Hardness rating scale A: Hardness is 300gf or more. b: Hardness is greater than or equal to 250gf and less than 300gf. c: Hardness is greater than or equal to 200gf and less than 250gf. d: Hardness is greater than 150gf and less than 200gf. e: Hardness is 150gf or less.

[0118] <Evaluation of oil stains> The oily stains of the produced oil-based solid cosmetics were evaluated. Specifically, the measurement sample was pressed with the index finger, and the liquid oil was evaluated to see if it seeped out around the area where the pressure was applied. Products that seeped out liquid oil when pressed tend to cause a poor feeling when used and makeup to come off. Products that received an evaluation of a or b were judged to have a high effect of suppressing oil stains.

[0119] Evaluation criteria for oil stains a: Liquid oil does not leak even when pressurized b: A small amount of liquid oil seeps out when pressurized. c: Liquid oil visibly leaks out when pressurized

[0120] [Table 7]

[0121] [Table 8]

[0122] [Table 9]

[0123] [Table 10]

[0124] The evaluation results of the lip balms are shown in Tables 7 to 10. The lip balms of Examples 10 to 27 had good hardness and resistance to oil staining. It was found that the hardness improving effect and oil stain suppressing effect obtained by combining the oligoesters of Synthesis Examples 1, 2, and 3 with plant-based wax or animal-based wax are not significantly affected by other ingredients, and will be similarly exhibited in cosmetics of various compositions.

[0125] [Example 28, Comparative Examples 11-12] Stick-type lip cream Using the oligoesters of Synthesis Examples 1 to 3, stick-type lip creams, which are oil-based solid cosmetics, were produced.

[0126] <Manufacture of lip balm> Based on the recipe in Table 11, all the raw ingredients were mixed and heated to 90°C, poured into a bullet-shaped lipstick mold, and cooled to room temperature to obtain a stick-shaped lip balm. At the same time, this was poured into a polypropylene container (diameter 36 mm, depth 11 mm) and cooled to room temperature to produce a cylindrical lip balm. The stick-shaped lip balm was used for evaluating the feel of use. The cylindrical lip balm was used for measuring hardness and evaluating oil stains.

[0127] In Table 11, 1,2-hexanediol was "KMO-6" manufactured by Kankosha, and caprylyl glycol was "OC-Diol" manufactured by Ochem Trading Co., Ltd.

[0128] <Hardness evaluation> The hardness of each lip balm was evaluated in the same manner as in Example 10.

[0129] <Evaluation of oil stains> The oily stains of each lip balm were evaluated in the same manner as in Example 10.

[0130] <Evaluation of Usability> A panel of five experts compared each lip balm against commercially available lip balms in terms of "resistance to oil stains," "good adhesion," "good spreadability," and "high gloss," using a three-point scale of "superior," "equal," or "inferior." The results are shown in Table 11.

[0131] Usability evaluation criteria; A: More than 3 out of 5 people rated it as "superior" to commercially available lip balms. b: Neither a nor c applies. c: Three or more out of five people rated it as "inferior" to commercially available lip balms.

[0132] [Table 11]

[0133] The evaluation results of each lip balm are shown in Table 11. The lip balm of Example 28 had sufficient hardness as a stick-type cosmetic product, was less oily when used, and had a good feel when used. In addition, there was no problem with the preservative performance.

[0134] [Example 29] Lipstick (stick type) Using the oligoester of Synthesis Example 1, a stick-type lipstick, which is an oil-based solid cosmetic product, was produced.

[0135] <Lipstick manufacturing> Based on the formula in Table 12, all the raw materials were mixed and heated at 90°C until thoroughly homogenized, then degassed under reduced pressure and poured into a mold. The mold was then cooled to 20°C to obtain a lipstick (stick type).

[0136] In Table 11, pentaerythrityl tetraisostearate was used as "Salacos 5418V" manufactured by Nisshin Oillio Group, dipentaerythrityl hexa(hydroxystearic acid / stearic acid / rosin acid) was used as "Cosmol 168ARV" manufactured by Nisshin Oillio Group, glyceryl (ethylhexanoate / stearic acid / adipic acid) was used as "Nomcort LAH" manufactured by Nisshin Oillio Group, di(phytosteryl / octyldodecyl) lauroyl glutamate was used as "Eldew PS-203" manufactured by Ajinomoto Co., Ltd., sorbitan sesquiisostearate was used as "Cosmol 182V" manufactured by Nisshin Oillio Group, and caprylyl glycol was used as "OC-Diol" manufactured by Ochem Trading Co., Ltd.

[0137] [Table 12]

[0138] The produced lipstick had sufficient hardness as a stick cosmetic product, was less likely to cause oily stains when used, and had good adhesion, spreadability, and gloss. In addition, the moisturizing feeling lasted a long time, and the makeup lasted well.

[0139] [Example 30] Lipstick (stick type) Using the oligoester of Synthesis Example 1, a stick-type lipstick, which is an oil-based solid cosmetic product, was produced.

[0140] <Lipstick manufacturing> Based on the formulation in Table 13, a lipstick (stick type) was obtained in the same manner as in Example 29.

[0141] In Table 13, neopentyl glycol dicaprate was selected from "Estemol N-01" manufactured by Nisshin Oillio Group, phenyl trimethicone was selected from "SH556 Fluid" manufactured by Toray Dow Corning, dipentaerythrityl pentaisostearate was selected from "Salacos DP-518N" manufactured by Nisshin Oillio Group, hydrogenated polyisobutene was selected from "Pearlream 18" manufactured by NOF Corp., octyldodecanol was selected from "N-Jecol 200A" manufactured by New Japan Chemical Co., Ltd., dipentaerythrityl hexahydroxystearate was selected from "Cosmoll 168M" manufactured by Nisshin Oillio Group, and dipentaerythrityl tetra(hydroxystearate / isostearate) was selected from "Nisshin Oillio Group". The oils used were "Cosmol 168EV" manufactured by Nisshin Oillio Group, "Salacos WO-6" manufactured by Nisshin Oillio Group for dipentaerythrityl tripolyhydroxystearate, "Plandool-G" manufactured by Nippon Fine Chemicals for dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, "OC-Diol" manufactured by Ochem Trading Co., Ltd. for caprylyl glycol, and "Nomcoat NW" manufactured by Nisshin Oillio Group for behenyl behenate.

[0142] [Table 13]

[0143] The produced lipstick had sufficient hardness as a stick-type cosmetic product, caused little oily staining during use, and had good application, spread and shine.

[0144] [Example 31] Oil-based foundation The oligoester of Synthesis Example 1 was used to produce an oil-based foundation, which is an oil-based solid cosmetic product.

[0145] <Manufacture of oil-based foundation> Based on the formulation in Table 14, an oil-based foundation was obtained in the same manner as in Example 29, except that the mold was replaced with a metal dish.

[0146] In Table 14, the mineral oil used was "Carnation" manufactured by SONNEBORN, the cetyl ethylhexanoate used was "Salacos 816T" manufactured by Nisshin Oillio Group, and the caprylyl glycol used was "OC-Diol" manufactured by Ochem Trading Co., Ltd.

[0147] [Table 14]

[0148] The oil-based foundation produced had sufficient shape retention as an oil-based solid cosmetic product, and had good adhesion and spreadability with little oil staining when used. When the oil-based foundation was used, it gave a beautiful finish with a natural luster, was not shiny, and lasted well. It also had a high covering effect on blemishes.

[0149] [Example 32] Lip liner pencil Using the oligoester of Synthesis Example 1, a lip liner pencil, which is an oil-based solid cosmetic product, was produced.

[0150] <Lip liner pencil manufacturing> Based on the recipe in Table 15, the materials were kneaded together, and the materials other than the volatile oil were melted at 100°C and mixed by stirring. The volatile oil was added to the resulting mixture, which was then mixed by stirring at 80°C and filled into a container to form a core body.

[0151] In Table 15, cyclopentasiloxane was "KF-995" manufactured by Shin-Etsu Chemical Co., Ltd., isododecane was "Marukasol R" manufactured by Maruzen Petrochemical Co., Ltd., sorbitan sesquiisostearate was "Cosmol 182V" manufactured by Nisshin Oillio Group, Ltd., and caprylyl glycol was "OC-Diol" manufactured by Ochem Trading Co., Ltd.

[0152] [Table 15]

[0153] The lip liner pencil thus produced had sufficient shape retention as a pencil-type cosmetic product, was less likely to cause oily stains when used, and had good adhesion, spread and shine. The cosmetic also lasted well. [Industrial Applicability]

[0154] According to the present invention, it is possible to provide an oil-based solid cosmetic that contains a vegetable wax or an animal wax, has excellent shape retention, is effective in suppressing oil stains during use, and has a good feel when used, and a hardness enhancer that is useful for producing the oil-based solid cosmetic.

Claims

1. A hardness improver for an oily solid cosmetic, which is composed of an oligoester obtained by subjecting glycerin as component (A), a dicarboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from linear saturated fatty acids having 10 to 24 carbon atoms as component (D) to an esterification reaction, wherein the esterification reaction is carried out with 0.65 to 0.8 mol of component (B) and a total amount of 1.2 to 1.7 mol of component (C) and component (D) per 1 mol of component (A), the mass ratio of component (C) to component (D) used in the esterification reaction is component (C): component (D) = 10:90 to 99.9, the oligoester has an acid value of 5 mg KOH / g or less, a saponification value of 420 to 510 mg KOH / g, and a hydroxyl value of 60 mg KOH / g or less, and the oily solid cosmetic is an oily solid cosmetic containing one or more waxes selected from a plant wax that is solid at 25°C and an animal wax that is solid at 25°C.

2. The hardness improver according to Claim 1, wherein the oily solid cosmetic contains one or more waxes selected from carnauba wax, rice bran wax, candelilla wax, sunflower seed wax, and beeswax.

3. The hardness improver according to Claim 1, wherein the plant wax is one or more selected from carnauba wax, rice bran wax, candelilla wax, and sunflower seed wax.

4. The hardness improver according to Claim 1, wherein the oily solid cosmetic does not contain a hydrocarbon wax (excluding a plant wax containing a naturally derived hydrocarbon component and an animal wax containing a naturally derived hydrocarbon component).

5. The hardness improver according to Claim 1, wherein component (B) is succinic acid.

6. The hardness improver according to Claim 1, wherein component (C) is caprylic acid.

7. The hardness improver according to Claim 1, wherein component (D) is capric acid.

8. The hardness improver according to claim 1, wherein the component (B) is succinic acid, the component (C) is caprylic acid, and the component (D) is capric acid.

9. The hardness improver according to claim 1, further comprising an oily component (excluding the oligoester) that is liquid or paste-like at 20°C in the oily solid cosmetic.

10. The hardness improver according to claim 1, wherein the oligoester is mixed so that its content in the entire oily solid cosmetic is 10 to 90% by mass with respect to the oily solid cosmetic containing 5 to 30% by mass of the one or more waxes.

11. The hardness improver according to claim 9, wherein the oligoester is mixed so that its content in the entire oily solid cosmetic is 10 to 90% by mass with respect to the oily solid cosmetic containing 5 to 30% by mass of the one or more waxes and having an oily component content of more than 0% by mass and 60% by mass or less.

12. The hardness improver according to claim 9, wherein the mass ratio of the oligoester ([content of oligoester (g)] / ([content of oily component (g)] + [content of oligoester (g)])) with respect to the total amount of the oily component and the oligoester in the oily solid cosmetic is mixed to be 0.2 to 1.

0.

13. The hardness improver according to claim 1, further comprising one or more selected from the group consisting of 1,2 - hexanediol, caprylyl glycol, ethylhexylglycerin, and phenoxyethanol in the oily solid cosmetic.

14. The hardness improver according to any one of claims 1 to 13, wherein the oily solid cosmetic is a stick cosmetic.

15. A method for using an oligoester as a hardness improver for improving the hardness of an oily solid cosmetic, wherein the oligoester is obtained by subjecting glycerin as component (A), a dicarboxylic acid having 2 to 12 carbon atoms as component (B), one or more fatty acids selected from the group consisting of caprylic acid, ethylhexanoic acid, isononanoic acid, isopalmitic acid, and isostearic acid as component (C), and one or more fatty acids selected from the group consisting of straight-chain saturated fatty acids having 10 to 24 carbon atoms as component (D) to an esterification reaction. The esterification reaction is carried out with 0.65 to 0.8 mol of the component (B) and a total amount of 1.2 to 1.7 mol of the component (C) and the component (D) per 1 mol of the component (A). The mass ratio of the component (C) to the component (D) used in the esterification reaction is component (C): component (D) = 10:90 to 99.9:0.

1. The oligoester has an acid value of 5 mgKOH / g or less, a saponification value of 420 to 510 mgKOH / g, and a hydroxyl value of 60 mgKOH / g or less. The method of use is characterized in that the oily solid cosmetic is an oily solid cosmetic containing one or more waxes selected from plant-based waxes that are solid at 25°C and animal-based waxes that are solid at 25°C.