Sunscreen composition

Abstract

The present invention provides a sunscreen composition containing: 2-51% by mass of a component (A); 9-80% by mass of a component (B) and 0.1-14% by mass of a component (C); 0.1-10% by mass of a component (D); 5-40% by mass of a component (E); the mass ratio ((A) / (B)) of the component (A) to the component (B) is 5 / 95 to 60 / 40 (wherein component (A): an isoparaffin having an average carbon number of 50 to 250; component (B): isoparaffin having an average number of carbon atoms of 20-24; component (C): an emulsifier such as a sorbitan fatty acid ester having an HLB of 2-10; component (D): a polyol having 2 to 6 carbon atoms and a valence of 2 to 3; component (E): an ultraviolet scattering agent; component (F): water.

Description

Technical Field

[0001] This invention relates to a sunscreen composition. Background Technology

[0002] In addition to protecting the skin from damage caused by ultraviolet rays, the demand for sunscreen compositions is also increasing. They require a thick texture when applied and spread, providing a sense of protection to the skin, and being easy to apply and spread. For example, Patent Document 1 describes a method that, by incorporating specific dextrin fatty acid esters and non-volatile phenyl-modified organosilicones into a color cosmetic with UV protection function, allows the cosmetic to adhere thickly and closely to the skin. Furthermore, Patent Document 2 describes a sunscreen cosmetic that exhibits good spreadability and a coating feel by incorporating specific fatty acid alkanolamide derivatives.

[0003] On the other hand, in recent years, due to a growing awareness of the adverse effects of ultraviolet (UV) radiation on the skin, sunscreens are frequently used even in winter when UV levels are lower. When applying these sunscreens, the presence of UV-scattering agents or other film-forming agents can cause a tightening sensation, or a feeling of tightness, in the skin. Furthermore, the dry air of winter exacerbates this tightness, making the skin more prone to dryness. In other words, in addition to the aforementioned issues of thickness and spreadability when applying sunscreens at low temperatures, there is also the technical problem of a tight feeling.

[0004] While the cosmetic product described in Patent Document 1 has good thickness, the sunscreen cosmetic product made using this cosmetic product has poor spreadability and tightness at low temperatures. The cosmetic product described in Patent Document 2 has good spreadability when applied, but poor thickness and tightness. In other words, the aforementioned cosmetics are less effective at maintaining a thick feel and being easy to apply and spread in the low temperatures of winter, and they also feel less tight.

[0005] To address the technical issue of tightness, Patent Document 3 discloses a sunscreen cosmetic containing specific particulate metal oxides, aqueous thickeners, and amphoteric surfactants, which describes that the sunscreen cosmetic does not cause tightness and has an excellent user experience. Existing technical documents Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-114832 Patent Document 2: Japanese Patent Application Publication No. 2018-52864 Patent Document 3: Japanese Patent Application Publication No. 2021-138621 Summary of the Invention (a) Technical problems to be solved

[0007] However, during winter sports such as skiing and snowboarding, the skin is subjected to both dryness and wind. Therefore, while sunscreen may not feel tight immediately after application, its effectiveness may diminish over time. This is because moisturizing ingredients evaporate more easily in these conditions, leading to dry and rough skin. The sunscreen described in Patent Document 3 exhibits a decline in effectiveness over time; therefore, a sunscreen that does not cause tightness even after activities in dry or windy environments, and also offers excellent user experience with a thicker texture and easy application, is desired.

[0008] The present invention was made in view of the above-mentioned technical problems, and aims to provide a sunscreen composition that maintains a thick feel when applied even in low-temperature environments, is easy to apply and spread, and does not easily feel tight over time even in dry or windy conditions, thus providing an excellent user experience. (II) Technical Solution

[0009] In order to solve the above-mentioned technical problems, the inventors of this application conducted in-depth research and found that by combining two specific isoparaffins, an emulsifier and a specific polyol, a sunscreen composition can be obtained that can solve the above-mentioned technical problems of thickness, ease of application and spread, and tightness caused over time under dry or windy conditions in a composition containing an ultraviolet scattering agent, thereby completing the present invention.

[0010] That is, the present invention is a sunscreen composition containing: 2 to 51% by mass of the following ingredient (A); 9 to 80% by mass of the following ingredient (B); 0.1 to 14% by mass of the following ingredient (C); 0.1 to 10% by mass of the following ingredient (D); 5 to 40% by mass of the following ingredient (E); and 6 to 57% by mass of the following ingredient (F), wherein the mass ratio of ingredient (A) to ingredient (B) ((A) / (B)) is 5 / 95 to 60 / 40. Component (A): Isoalkanes with an average carbon number of 50-250. Component (B): Isoalkanes with an average carbon number of 20-24. Ingredient (C): One or more emulsifiers selected from the group consisting of sorbitan fatty acid esters with HLB 2-10, fatty acid glycerides with HLB 2-10, and polyoxyethylene monoglycerides with HLB 2-10. Component (D): Polyols with 2-6 carbon atoms and valences of 2-3. Component (E): Ultraviolet scattering agent, Ingredients (F): Water. (III) Beneficial Effects

[0011] The sunscreen composition according to the present invention can achieve the effect of maintaining a thick feel when applied even in low temperature environments, and being easy to apply and spread, and can also achieve the effect of not easily feeling tightness over time even in dry or windy conditions. Detailed Implementation

[0012] The following describes embodiments of the present invention, but the present invention is not limited to the embodiments described in this specification, and various modifications can be made without departing from the spirit of the present invention. In addition, in this specification, the numerical range defined by the symbol "~" includes the values ​​at both ends of "~" (upper and lower limits). For example, "2~5" means "more than 2 and less than 5". Furthermore, the upper or lower limit of the numerical range described in this specification may be replaced with the upper or lower limit of other numerical ranges, the values ​​shown in the embodiments, or the values ​​uniquely derived from the embodiments. The values ​​described in this specification have inherent variability due to the measurement techniques used to determine them. Furthermore, the values ​​should be interpreted using rounding based on the number of significant figures.

[0013] <Sunscreen Composition> The sunscreen composition of the present invention contains ingredients (A), (B), (C), (D), (E), and (F). The ingredients will be described below.

[0014] [Ingredients (A)] The component (A) used in this invention is an isoalkane with an average carbon number of 50 to 250. This isoalkane is a mixture of long-chain hydrocarbons with side chains, typically obtained by hydrogenation of a polymer of isobutylene and n-butene. Examples of such components include substances commonly classified as "heavy liquid isoalkane" in the cosmetics industry.

[0015] The lower limit for the average number of carbon atoms in isoalkanes is 50, preferably 60, more preferably 70, and particularly preferably 80. The upper limit for the average number of carbon atoms in isoalkanes is 250, preferably 230, more preferably 210, and particularly preferably 190. If the average number of carbon atoms is too small, it may be difficult to actually feel the thickness of the sunscreen composition when applied in low-temperature environments, or a tight feeling may be felt over time. On the other hand, if the average number of carbon atoms is too large, the ease of application and spread in low-temperature environments may sometimes be reduced. The range of the average number of carbon atoms in isoalkanes can be defined by using any value selected from the values ​​described above as the upper and lower limits. Examples of the average number of carbon atoms in isoalkanes include 50 to 250, preferably 60 to 230, more preferably 70 to 210, and particularly preferably 80 to 190.

[0016] The average carbon number in this specification is a value derived from the peak area and mass analysis results obtained using a GC-MS (Gas Chromatography-Mass Spectrometry) apparatus (JMS-T2000GC AccuTOF (registered trademark) GC-Alpha, manufactured by JEOL Ltd.).

[0017] For example, component (A) can be synthesized as follows: First, a mixture of isobutylene and n-butene gas can be treated using known methods, such as cationic polymerization with a catalyst, to obtain a polymer. Next, the obtained polymer is hydrogenated to obtain a hydrogenated polymer, which is then purified through adsorption treatment, distillation, and other purification processes to obtain component (A).

[0018] Specific products that may be listed as component (A) include "PARLEAM 18" (average carbon number 72), "PARLEAM 24" (average carbon number 96), and "PARLEAM 46" (average carbon number 184) (all manufactured by NOF Co., Ltd). Component (A) may use one or more of the above-mentioned isoalkanes with different average carbon numbers.

[0019] [Ingredient (B)] The component (B) used in this invention is an isoalkanes with an average carbon number of 20 to 24; in other words, it is a mixture of medium-chain hydrocarbons with side chains, which can usually be obtained by hydrogenating a polymer of isobutylene and n-butene. Examples of such components include substances commonly classified as "liquid isoalkanes" in the cosmetics industry.

[0020] If the average number of carbon atoms is less than 20, it is difficult to actually feel the thickness of the sunscreen composition when applying it in low-temperature environments, or it is easy to feel a tightness over time. On the other hand, if the average number of carbon atoms is greater than 24, the ease of application and spread in low-temperature environments may sometimes be reduced.

[0021] For example, component (B) can be synthesized as follows: First, a mixture of isobutylene and n-butene gas can be treated using known methods, such as cationic polymerization with a catalyst, to obtain a polymer. Next, the obtained polymer is hydrogenated to obtain a hydrogenated polymer, which is then purified through adsorption treatment, distillation, and other purification processes to obtain component (B).

[0022] Specific products that can be listed as component (B) include "PARLEAM 6" (average carbon number 24), "PARLEAMEX" (average carbon number 20) (both manufactured by NOF Co., Ltd.), and "IP Solvent 1620" (average carbon number 20) (manufactured by Idemitsu Kosan Co., Ltd.). Component (B) may use one or more of the above-mentioned isoalkanes with different average carbon numbers.

[0023] [Ingredient (C)] The component (C) used in this invention is one or more emulsifiers selected from the group consisting of sorbitan fatty acid esters with an HLB of 2 to 10, fatty acid glycerides with an HLB of 2 to 10, and polyoxyethylene monofatty acid glycerides with an HLB of 2 to 10.

[0024] The lower limit of the HLB value of the emulsifier in component (C) is 2, preferably 3, and more preferably 4. Furthermore, the upper limit of the HLB value is 10, preferably 8, and more preferably 6. The range of HLB can be defined by using any value selected from the values ​​described above as the upper and lower limits. Examples of HLB values ​​for component (C) include 2 to 10, preferably 3 to 8, and more preferably 4 to 6. If the HLB value of component (C) is not within the range defined above, the emulsion stability may decrease. The HLB mentioned here is an indicator of affinity for water, which can be obtained by Griffin (WC. Griffin: J. Soc. Cosmetic Chemists, 33, 1180 (1960)) and calculated using the following formula. HLB = 20(1-S / A) (where S: saponification value of the ester; A: neutralization value of the fatty acid.) In addition, saponification value and neutralization value can be determined, for example, according to the method described in "Standard Oil Analysis Test Method (1)" (Japan Oil Chemists' Society, 1996).

[0025] The fatty acids constituting sorbitan fatty acid esters, fatty acid glycerides, and polyoxyethylene monoglycerides preferably have 8 to 22 carbon atoms. Furthermore, the fatty acid can be branched or straight-chain, and can be a monobasic fatty acid or a dibasic or polybasic fatty acid, but is preferably a monobasic fatty acid. The fatty acid can be a saturated fatty acid or an unsaturated fatty acid, can have hydroxyl groups, and can be condensed. Furthermore, it can be a mixture of fatty acids. In addition to fatty acids with 8 to 22 carbon atoms, the fatty acids used in the manufacture may also include pinoresinic acid, within the scope of not impairing the effects of the present invention. The fatty acid preferably has 12 or more carbon atoms, more preferably 14 or more, and more preferably 18 or less. Preferred ranges for the number of carbon atoms in the fatty acid include, for example, 12-22, 14-22, 8-18, 12-18, and 14-18, in addition to 8-22. Examples of fatty acids with 8 to 22 carbon atoms include ethylhexanoic acid, capric acid, lauric acid, myristic acid, palmitic acid, isopalmitic acid, macadamia nut fatty acids, stearic acid, isostearic acid, hydroxystearic acid, oleic acid, and behenic acid. Among these, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, and oleic acid are preferred.

[0026] Sorbitan fatty acid esters are esters in which a hydroxyl group of sorbitol or an intramolecular condensate of sorbitol forms an ester bond with a fatty acid. Commercially available sorbitan fatty acid esters with an HLB of 2 to 10 include, for example, NONION CP-08R (sorbitan monodecanoate (HLB: 9.6)), NONION LP-20R (sorbitan monolaurate (HLB: 8.6)), NONION PP-40R pellets (sorbitan palmitate (HLB: 6.7)), NONION SP-60R pellets (sorbitan monostearate (HLB: 4.7)), NONION OP-80R (sorbitan monooleate (HLB: 4.3)), and NONION OP-83RAT (sorbitan sesquioleate (HLB: 3.7)) (manufactured by NOF Co., Ltd.).

[0027] Fatty acid glycerides are esters having a structure in which one hydroxyl group of glycerol forms an ester bond with a fatty acid. Polyoxyethylene monofatty acid glycerides are compounds having a structure in which ethylene oxide is added to the other two hydroxyl groups of the ester. The lower limit of the molar number of ethylene oxide added to the polyoxyethylene monofatty acid glycerides is preferably 5, more preferably 6, and particularly preferably 7. Furthermore, the upper limit is preferably 30, more preferably 20, and particularly preferably 10. The range of the molar number of ethylene oxide added can be defined by using any value selected from the values ​​described above as the upper and lower limits. Examples of the molar number of ethylene oxide added to the polyoxyethylene monofatty acid glycerides include, for example, 5 to 30, more preferably 6 to 20, and particularly preferably 7 to 10.

[0028] Examples of fatty acid glycerides include myristate glycerides and coconut oil fatty acid glycerides. Examples of polyoxyethylene mono-fatty acid glycerides include polyoxyethylene coconut oil fatty acid glycerides, polyoxyethylene (caprylic / capric) glycerides, polyoxyethylene laurate glycerides, polyoxyethylene oleate glycerides, and polyoxyethylene isostearate glycerides. Commercially available products such as NIKKOL MGM (glycerate myristate (HLB: 3.5)) (manufactured by Nikko Chemicals Co., Ltd.) can be used as examples of fatty acid glycerides with an HLB of 2 to 10. Component (C) may be used alone, or two or more of the above-mentioned esters used as emulsifiers may be used simultaneously.

[0029] [Ingredient (D)] The component (D) used in this invention is a polyol with 2 to 6 carbon atoms and a valence of 2 to 3. One or more polyols selected from those satisfying this condition may be used. Preferably, the number of carbon atoms is 2 to 5, more preferably 3 to 4. Furthermore, the valence is preferably 3. Specifically, examples include propylene glycol, 1,3-butanediol, and glycerol, with 1,3-butanediol and glycerol being preferred, and glycerol being more preferred. "2 to 3" means that one molecule has 2 to 3 hydroxyl groups.

[0030] [Ingredient (E)] The component (E) used in this invention is a UV scattering agent incorporated to scatter or block UV light. As for the UV scattering agent, it is not particularly limited as long as it is a UV scattering agent commonly used in cosmetics; for example, it is preferably at least one selected from the group consisting of titanium oxide, zinc oxide, iron oxide, and cerium oxide. Among these, titanium oxide and zinc oxide are more preferred.

[0031] The average primary particle size of these ultraviolet scattering agents is preferably 5 nm to 100 nm, more preferably 10 nm to 40 nm. In addition, the "average primary particle size" is a value obtained by measuring the particle size of 200 randomly selected particles using a transmission electron microscope and calculating the average primary particle size.

[0032] There are no particular limitations on the shape of the ultraviolet scattering agent. For example, ultraviolet scattering agents with any shape such as spherical, rod-shaped, needle-shaped, spindle-shaped, or plate-shaped can be used. Ultraviolet scattering agents can be coated with either inorganic or organic surfaces, or both. Inorganic surface coating refers to, for example, coating the surface of an ultraviolet scattering agent with a hydroxide and / or oxide of at least one element selected from silicon, aluminum, zinc, iron, titanium and zirconium, wherein aluminum hydroxide is preferred. Organic surface coating refers to the coating of the surface of an ultraviolet scattering agent with a known organosilicon compound, such as a known organosilicon with hydrogen-silicon bonds, such as a methylhydropolysiloxane (polydimethylsiloxane / polymethylsiloxane) copolymer, or a triethoxysilyl ethyl polydimethylsiloxane with alkoxy-silicon bonds as reactive groups. Among these, coating with a methylhydropolysiloxane (polydimethylsiloxane / polymethylsiloxane) copolymer is preferred.

[0033] The aforementioned ultraviolet scattering agents can be used in their elemental form or as commercially available products made by stably pulverizing metal oxides into low-order particles in an oil. Examples of oils used for pulverizing metal oxides include silicone oil, ester oil, and hydrocarbon oil. Examples of such commercially available products include "IOPP60ZIAJ" and "IOPP50TIJ" manufactured by KoboDispatek,inc., and "DIF-3ST2," "DIS-11A," and "STR-100A-LP" manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD.

[0034] Kobo Dispatek, Inc.'s "IOPP60ZIAJ" is composed of zinc oxide, ethylhexyl palmitate, isostearic acid, and polyhydroxystearic acid; "IOPP50TIJ" is composed of titanium oxide, ethylhexyl palmitate, aluminum hydroxide, isostearic acid, and polyhydroxystearic acid. SAKAI CHEMICAL INDUSTRY CO., LTD.'s "DIF-3ST2" is composed of zinc oxide, cyclopentasiloxane, and hydrogen-modified polydimethylsiloxane; "DIS-11A" is composed of titanium oxide, cyclopentasiloxane, hydrated silica, aluminum hydroxide, and hydrogen-modified polydimethylsiloxane; and "STR-100A-LP" is composed of titanium oxide, hydrated silica, aluminum hydroxide, and hydrogen-modified polydimethylsiloxane. Ultraviolet scattering agents can be used alone or in combination of two or more.

[0035] [Ingredients (F)] The component (F) used in this invention is water, such as purified water like ion-exchanged water or distilled water, tap water, etc., preferably purified water like ion-exchanged water or distilled water.

[0036] [Content of each ingredient] The minimum content of ingredient (A) in the sunscreen composition is 2% by mass, preferably 5% by mass, more preferably 10% by mass, and particularly preferably 14% by mass. The maximum content of ingredient (A) is 51% by mass, preferably 35% by mass, more preferably 25% by mass, and particularly preferably 18% by mass. If the content of ingredient (A) is too low, a tight feeling may sometimes be felt over time, or it may be difficult to feel a thick texture when applied in low-temperature environments. On the other hand, if the content of ingredient (A) is too high, the ease of application and spread in low-temperature environments may sometimes be reduced. The range of the content of component (A) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (A) can be 2 to 51% by mass, preferably 5 to 35% by mass, more preferably 10 to 25% by mass, and particularly preferably 14 to 18% by mass.

[0037] The minimum content of ingredient (B) in the sunscreen composition is 9% by mass, preferably 17% by mass, more preferably 25% by mass, and particularly preferably 33% by mass. The maximum content of ingredient (B) is 80% by mass, preferably 66% by mass, more preferably 52% by mass, and particularly preferably 39% by mass. If the content of ingredient (B) is too low, the ease of application and spread may be reduced in low-temperature environments, or a tight feeling may be felt over time. On the other hand, if the content of ingredient (B) is too high, it may be difficult to actually feel the thickness when applying the product in low-temperature environments. The range of the content of component (B) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (B) can be 9 to 80% by mass, preferably 17 to 66% by mass, more preferably 25 to 52% by mass, and particularly preferably 33 to 39% by mass.

[0038] The lower limit of the content of ingredient (C) in the sunscreen composition is 0.1% by mass, preferably 1% by mass, more preferably 2% by mass, and particularly preferably 3% by mass. The upper limit of the content of ingredient (C) is 14% by mass, preferably 10% by mass, more preferably 8% by mass, and particularly preferably 6% by mass. If the content of ingredient (C) is too low, the emulsification stability may be insufficient; if the content of ingredient (C) is too high, the ease of application and spread at low temperatures may be reduced. The range of the content of component (C) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (C) can be 0.1 to 14% by mass, preferably 1 to 10% by mass, more preferably 2 to 8% by mass, and particularly preferably 3 to 6% by mass.

[0039] The lower limit of the content of ingredient (D) in the sunscreen composition is 0.1% by mass, preferably 1% by mass, more preferably 2% by mass, and particularly preferably 3% by mass. The upper limit of the content of ingredient (D) is 10% by mass, preferably 8% by mass, more preferably 7% by mass, and particularly preferably 6% by mass. If the content of ingredient (D) is too low, it may be difficult to actually feel the thickness when applying it in low-temperature environments. On the other hand, if the content of ingredient (D) is too high, the ease of application and spread in low-temperature environments may sometimes be reduced. The range of the content of component (D) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (D) can be 0.1 to 10% by mass, preferably 1 to 8% by mass, more preferably 2 to 8% by mass, particularly preferably 3 to 7% by mass, and even more preferably 3 to 6% by mass.

[0040] The minimum content of ingredient (E) in the sunscreen composition is 5% by mass, preferably 10% by mass, more preferably 15% by mass, and particularly preferably 20% by mass. The maximum content of ingredient (E) is 40% by mass, preferably 35% by mass, more preferably 30% by mass, and particularly preferably 25% by mass. If the content of ingredient (E) is too low, sufficient UV protection may not be achieved; if the content of ingredient (E) is too high, the ease of application and spread may be reduced in low-temperature environments, or a tight feeling may be felt over time. The range of the content of component (E) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (E) can be 5 to 40% by mass, preferably 10 to 35% by mass, more preferably 15 to 30% by mass, particularly preferably 20 to 30% by mass, and even more preferably 20 to 25% by mass.

[0041] The lower limit of the content of ingredient (F) in the sunscreen composition is 6% by mass, preferably 10% by mass, more preferably 16% by mass, and particularly preferably 18% by mass. The upper limit of the content of ingredient (F) is 57% by mass, preferably 47% by mass, more preferably 35% by mass, and particularly preferably 25% by mass. If the content of ingredient (F) is too low, a tight feeling may be felt over time. If the content of ingredient (F) is too high, the emulsification stability is insufficient, and a tight feeling may be felt over time, or it may be difficult to feel the thickness when applied in low-temperature environments. The range of the content of component (F) can be defined by using any value selected from the values ​​described above as the upper and lower limits. For example, the content of component (F) can be 6 to 57% by mass, preferably 10 to 47% by mass, more preferably 16 to 47% by mass, particularly preferably 18 to 35% by mass, and even more preferably 18 to 25% by mass.

[0042] In this invention, the lower limit of the mass ratio of component (A) to component (B) ((A) / (B)) is 5 / 95, preferably 10 / 90, and more preferably 20 / 80. The upper limit of the mass ratio ((A) / (B)) is 60 / 40, preferably 50 / 50, and more preferably 40 / 60. If the mass ratio ((A) / (B)) is too small, it may be difficult to actually feel the thickness when applying the product in low-temperature environments, or it may be easy to feel a tightness over time. If the mass ratio ((A) / (B)) is too large, the ease of application and spread in low-temperature environments may sometimes decrease. The range of the mass ratio ((A) / (B)) can be defined by using any mass ratio selected from the mass ratios described above as the upper and lower limits. Examples of mass ratios ((A) / (B)) include 5 / 95 to 60 / 40, preferably 10 / 90 to 50 / 50, and more preferably 20 / 80 to 40 / 60.

[0043] [Other ingredients] The sunscreen composition of the present invention may include various other ingredients within a range that maintains its stability without compromising the effectiveness of the invention. Examples include oily materials such as vegetable oils, animal oils, paraffin, paraffins other than polybutene, petrolatum, fatty acid esters other than component (C), higher fatty acids, and higher alcohols; inorganic compounds such as talc, silica, kaolin, sodium carbonate, and borax; organic solvents such as ethanol, isopropanol, and ethylene glycol; water-soluble polymers such as polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyvinylpyrrolidone, carboxymethyl cellulose, block copolymers of ethylene oxide and propylene oxide, and copolymers of maleic anhydride and methyl vinyl ether; in addition, oxidative stabilizers, preservatives / bactericides, colorants, fragrances, pharmaceuticals, or mixtures thereof may also be included. Furthermore, the sunscreen composition of the present invention sometimes contains the aforementioned compounds other than ultraviolet scattering agents contained in commercially available products containing ingredient (E) of ultraviolet scattering agents.

[0044] The content of the other ingredients in the sunscreen composition of the present invention can be set according to the amount commonly used in cosmetics and the like, depending on the purpose, and is generally 20% by mass or less in the composition. The upper limit of the content of the other ingredients is preferably 15% by mass, more preferably 10% by mass, and the lower limit is preferably 0.1% by mass, more preferably 0.5% by mass. The preferred range of the content of other components can be defined by using values ​​arbitrarily selected from the values ​​described above as upper and lower limits. For example, the content of other components is preferably 0.1 to 15% by mass, and more preferably 0.5 to 10% by mass.

[0045] The content of each of the above-mentioned components is the content when the total content of the components constituting the sunscreen composition is set to 100% by mass. The total content of the above-mentioned components (A) to (F) is preferably 80% by mass or more, more preferably 85% by mass or more, and particularly preferably 90% by mass or more. In addition, by appropriately adjusting the amount of water added, the content of each component can be adjusted to the desired level.

[0046] [Preparation of Sunscreen Composition] The sunscreen composition of the present invention can be prepared using known methods. For example, it can be prepared by mixing the aforementioned components and emulsifying them for about 10 to 120 minutes, depending on the volume, using an emulsifier or kneader such as a homogenizer, homogenizer, roller tester or mill, at a temperature range of room temperature to 90°C. Example

[0047] The following examples and comparative examples further illustrate the implementation of the present invention, but the present invention is not limited thereto.

[0048] <Sunscreen Composition> The sunscreen compositions shown in Table 1 (Examples 1-16) and Table 2 (Comparative Examples 1-10) were prepared using known methods and evaluated using the methods described below. In addition, in Tables 1 and 2, the values ​​for each ingredient represent the content (mass %) relative to the total amount of the sunscreen composition. Furthermore, ingredient (A) / ingredient (B) indicates the content ratio of ingredient (A) to ingredient (B).

[0049] [Ingredients (A)] #1 Hydrogenated polyisobutylene: PARLEAM 24 (manufactured by NOF Co., Ltd) (average carbon number 96) #2 Hydrogenated polyisobutylene: PARLEAM 46 (manufactured by NOF Co., Ltd) (average carbon number 184) #3 Hydrogenated polyisobutylene: PARLEAM 18 (manufactured by NOF Co., Ltd) (average carbon number 72) [Ingredient (B)] #4 Hydrogenated polyisobutylene: PARLEAM 6 (manufactured by NOF Co., Ltd) (average carbon number 24) #5 Hydrogenated polyisobutylene: manufactured by PARLEAM EX (NOF Co., Ltd) (average carbon number 20) [Ingredient (C)] #6 Sorbitan Monooleate: NONION OP-80R (manufactured by NOF Co., Ltd., HLB: 4.3) #7 Myristyl glyceride: Manufactured by NIKKOL MGM (Nikko Chemicals Co., Ltd., HLB: 3.5) [Ingredient (D)] • Glycerin: RG-S (manufactured by NOF Co., Ltd) • 1,3-Butanediol: 1,3-butylene glycol-P (manufactured by KH Neochem Co., Ltd.) [Ingredient (E)] #8 Ultraviolet Scattering Agent (Titanium Oxide): STR-100A-LP (Manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD.) (Average Primary Particle Size 15nm)

[0050] <Evaluation of Sunscreen Compositions> For each sunscreen composition of Examples 1-16 and Comparative Examples 1-10, as described in (1)-(3) below, the thickness upon application, the ease of application at low temperatures, and the degree to which no tightness occurs over time were evaluated. The evaluation results are recorded in Tables 1 and 2. In addition, each reviewer conducting the following evaluations was trained in a pre-evaluation trial prior to the evaluation trial to ensure that the degree of evaluation corresponding to each score was roughly consistent, so that there would be no difference in the evaluation criteria among the reviewers.

[0051] (1) Thickness when applying Ten men and women aged 25 to 55 served as judges. After washing their hands with hand sanitizer, they took 0.2g of each sunscreen composition stored at 5°C on their fingertips and applied it to the back of their hands. The judges evaluated the thickness of the spread and the feeling of skin protection according to the following absolute evaluation criteria. <Absolute Evaluation Benchmark> (Rating): (Evaluation) 2 points: It feels very solid. 1 point: It feels slightly solid. 0 points: It doesn't feel substantial.

[0052] (2) Ease of application and spread at low temperatures Ten men and women aged 25 to 55 served as judges. After washing their hands with hand sanitizer, they took 0.2g of each sunscreen composition stored at 5°C on their fingertips and applied it to the back of their hands. The spreadability at this time was evaluated according to the following absolute evaluation criteria. <Absolute Evaluation Benchmark> (Rating): (Evaluation) 2 points: It feels very stretchy. 1 point: The elasticity feels slightly better. 0 points: Feels like poor elasticity.

[0053] (3) The degree of tightness that does not develop over time Ten male and female judges aged 25 to 55 years were selected. Each sunscreen composition, stored at 5°C, was applied to the back of the hand at a rate of 0.2g on the fingertip. After 3 hours at 10°C and 30% humidity, the judges evaluated whether the skin still felt as moisturized as immediately after application and whether there was any pulling sensation when moving the fingers. Additionally, the back of the hand was blown with a fan for 3 minutes every 30 minutes during these 3 hours. Evaluation was conducted according to the following absolute evaluation criteria. <Absolute Evaluation Benchmark> (Rating): (Evaluation) 2 points: I don't feel any tightness. 1 point: I feel a slight tightness. 0 points: I felt a strong sense of tension.

[0054] For each evaluation in (1) to (3) above, calculate the total score of each reviewer. Based on the total score, make a judgment according to the following evaluation criteria. In addition, the evaluations other than "×" such as "◎", "〇" and "△" are set as qualified. ◎: Total score of 17 or above ○: Total score of 14 or higher but less than 17 points △: Total score of 11 or higher but less than 14 points ×: Total score less than 11 points

[0055] [Table 1]

[0056] [Table 2]

[0057] All sunscreen compositions in Examples 1-16 exhibited excellent thickness upon application, ease of application at low temperatures, and minimal tightness over time.

[0058] However, adequate performance was not obtained in Comparative Examples 1 to 10. Comparative Example 1, lacking ingredient (B), did not achieve sufficient ease of application and spread at low temperatures, nor sufficient absence of tightness over time. Comparative Example 2, lacking ingredient (A), did not provide sufficient thickness upon application or the absence of tightness over time. Comparative Example 3, due to containing more than 14% by mass of component (C), did not have sufficient ease of application and spread at low temperatures.

[0059] Comparative Example 4, lacking ingredient (D), did not provide sufficient thickness when applied. Comparative Example 5, due to containing more than 10% by mass of component (D), did not have sufficient ease of application and spread at low temperatures. Comparative Example 6, due to containing more than 40% by mass of ingredient (E), did not have sufficient ease of application and spread at low temperatures, nor sufficient degree of absence of tightness over time. Comparative Example 7, containing less than 6% by mass of component (F), did not adequately produce a tightening sensation over time. Comparative Example 8, due to containing more than 57% by mass of ingredient (F), did not provide sufficient thickness upon application or sufficient relief from tightness over time. Comparative Example 9: Due to the mass ratio of component (A) to component (B) ((A) / (B)) being greater than 60 / 40, the ease of application and spreading at low temperatures is insufficient. In Comparative Example 10, because the mass ratio of component (A) to component (B) ((A) / (B)) is less than 5 / 95, the thickness felt during application and the lack of tightness that occurs over time are insufficient.

[0060] Next, examples of formulations of the sunscreen composition of the present invention (Formulation Examples 1 and 2) are shown. The sunscreen compositions of these formulation examples were evaluated in the above (1) to (3) and the results showed that they maintained a thick feel when applied even in low temperature environments, were easy to apply and spread, and did not easily feel tight over time even in dry or windy conditions, resulting in excellent user experience. In addition, for the mass ratio ((A) / (B)) in the following formulation examples, formulation example 1 is 34 / 66 and formulation example 2 is 36 / 64. In addition, the following formulation examples use the following ingredient (E). • Hydrophobically treated titanium dioxide: STR-100A-LP (manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD.) • Hydrophobicated zinc oxide: FINEX-50LP (manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD.)

[0061] [Formula Example 1: Sunscreen Lotion]

[0062] [Formula Example 2; Sunscreen Lotion] Industrial applicability

[0063] The sunscreen composition of the present invention maintains a thick feel when applied even in low-temperature environments, is easy to apply and spread, and does not easily feel tight over time even in dry or windy conditions, thus providing an excellent user experience and making it suitable for use as a sunscreen cosmetic.

Claims

1. A sunscreen composition comprising: 2-51% by mass of the following ingredient (A); 9-80% by mass of the following ingredient (B); 0.1-14% by mass of the following ingredient (C); 0.1-10% by mass of the following ingredient (D); 5-40% by mass of the following ingredient (E); and 6-57% by mass of the following ingredient (F), wherein the mass ratio of ingredient (A) to ingredient (B) ((A) / (B)) is 5 / 95 to 60 / 40. Component (A): Isoalkanes with an average carbon number of 50-250. Component (B): Isoalkanes with an average carbon number of 20-24. Ingredient (C): One or more emulsifiers selected from the group consisting of sorbitan fatty acid esters with HLB 2-10, fatty acid glycerides with HLB 2-10, and polyoxyethylene monofatty acid glycerides with HLB 2-10. Component (D): Polyols with 2-6 carbon atoms and valences of 2-3. Component (E): Ultraviolet scattering agent, Ingredients (F): Water.

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