Sunscreen cosmetic

Abstract

To provide a sunscreen cosmetic that allows high ultraviolet protection to be maintained even when it is wetted with water in use or a cosmetic film is rubbed in a wetted state, and allows the cosmetic to be easily removed by using a low-friction cleaning agent such as a foam detergent without the use of a cleansing agent during cleaning.SOLUTION: A sunscreen cosmetic includes 5 to 30 mass% of a component (A), 0.1 to 5 mass% of a component (B), 0.01 to 1 mass% of a component (C), and 0.5 to 10 mass% of a component (D). The component (A) is an ultraviolet protective agent. The component (B) is polyglycerin fatty acid ester. The component (C) is an anionic surfactant. The component (D) is an alkylene oxide derivative represented by the following formula (1): Gly-[O{(PO)a(EO)b}-H]3 (1). (In the formula (1), Gly represents a residue obtained by removing hydroxyl groups from glycerin, PO represents an oxypropylene group, and EO represents an oxyethylene group. "a" and "b" denote an average addition molar number of PO and EO, respectively. Ranges are 0≤a≤70, 0≤b≤50, and 1≤a+b≤80. PO and EO may be added in random form or in block form, and in the case of block addition, the sequence order is not restricted).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a sunscreen cosmetic.

Background Art

[0002] Sunscreen cosmetics are generally applied to prevent sunburn during outdoor sports and leisure activities. For example, at a summer beach or a winter ski resort, one may be exposed to ultraviolet rays for a long time, and it is recommended to apply a sunscreen cosmetic with a high sunburn prevention effect and make its effect last long. In such situations, since there are many opportunities to come into contact with moisture such as seawater and sweat, water resistance is required to maintain the ultraviolet ray protection effect. Therefore, many water-resistant sunscreen cosmetics have been devised by taking advantage of the water repellency of oil-based or water-in-oil emulsion systems.

[0003] On the other hand, in recent years, sunscreen cosmetics are often used daily based on health awareness such as preventing skin aging and for beauty purposes. Under such circumstances, in addition to the long-lasting ultraviolet ray protection effect when using the cosmetic, simplicity in cleansing and no burden on the skin are required. In other words, there is a demand for a cosmetic that can be easily washed off without burdening the skin even when using a low-friction detergent such as a foam cleanser instead of a dedicated cleansing agent. In response to such demands, studies have been conducted to achieve both water resistance and washability of sunscreen cosmetics.

[0004] For example, as a water-in-oil type emulsion composition excellent in washability, Patent Document 1 proposes a combination of polyglycerol fatty acid ester, an anionic surfactant, and a silicone-based film-forming agent, and Patent Document 2 proposes a combination of a hydrophobic modified polyurethane and a polyoxyalkylene glyceryl ether to provide a sunscreen cosmetic excellent in water resistance.

[0005] Further, Patent Document 3 proposes a water-in-oil type emulsified composition excellent in water resistance, which combines an organically modified clay mineral, an oil phase thickener such as dextrin fatty acid ester, and a silicone surfactant with an HLB of less than 8, to provide a sunscreen cosmetic that is strongly adherent to water and can be easily washed off. However, even if these cosmetics could be washed off with soap or the like, it was necessary to wash them while rubbing the skin, and their ease of being washed off with a low-friction detergent such as a foam cleanser and their lack of burden on the skin were insufficient. In addition, the present inventors have found a further problem that even if a highly water-resistant sunscreen cosmetic has rub resistance against clothes or the like in a dry state, when it is rubbed with clothes, a towel, etc. while still wet, such as immediately after a bath, the ultraviolet ray protection effect is significantly reduced.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] From the above, there has been a demand for a sunscreen cosmetic that can maintain a high ultraviolet ray protection ability even when wet during use and even when the makeup film is rubbed while still wet, and can be easily washed off with a low-friction detergent such as a foam cleanser without using a cleansing agent during washing, but such problems have not been solved until now. In view of the above problems, an object of the present invention is to provide a sunscreen cosmetic that has water resistance during use and rub resistance in a wet state, and can be easily washed off with a low-friction detergent such as a foam cleanser during washing.

Means for Solving the Problems

[0008] As a result of intensive studies in view of the above problems, the present inventors have found that a sunscreen cosmetic capable of solving the above problems can be obtained by combining an ultraviolet light protector, a polyglycerol fatty acid ester, an anionic surfactant, and a specific alkylene oxide derivative in predetermined blending amounts, and thus have completed the present invention. That is, the present invention relates to the following [1].

[0009] [1] A sunscreen cosmetic containing 5 to 30% by mass of the following component (A), 0.1 to 5% by mass of component (B), 0.01 to 1% by mass of component (C), and 0.5 to 10% by mass of component (D). (A) Ultraviolet light protector (B) Polyglycerol fatty acid ester (C) Anionic surfactant (D) An alkylene oxide derivative represented by the following formula (1) Gly-[O{(PO)a(EO)b}-H]3···(1) (In formula (1), Gly is the residue obtained by removing a hydroxyl group from glycerin, PO is an oxypropylene group, EO is an oxyethylene group, a and b are the average addition mole numbers of PO and EO, respectively, 0 ≦ a ≦ 70, 0 ≦ b ≦ 50, and 1 ≦ a + b ≦ 80. The addition form of PO and EO may be random or blocky, and when it is block addition, the sequence order is not limited.)

Advantages of the Invention

[0010] According to the sunscreen cosmetic of the present invention, a high ultraviolet light protection ability can be maintained even when it gets wet with water during use or when the cosmetic film is rubbed while in a further wet state. Furthermore, it can be easily washed off with a low-friction detergent such as a foam detergent without using a cleansing agent during washing.

Modes for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the embodiments described in this specification and can be variously modified without departing from the gist of the present invention. In this specification, a numerical range defined using the symbol "~" shall include the numerical values at both ends (upper limit and lower limit) of "~". For example, "2~5" represents 2 or more and 5 or less. In a plurality of numerical ranges described stepwise in this specification, each upper limit value and each lower limit value can be the upper limit value or the lower limit value of an arbitrarily combined numerical range. For example, when there is a description of "5~20 mass%, 10~15 mass%" regarding the content of a certain component, numerical ranges such as "5~15 mass%", "10~20 mass%", "5~10 mass%", and "15~20 mass%" can be constituted. Also, in the numerical ranges described in this specification, the upper limit value or the lower limit value of the numerical range can be replaced with the value shown in the examples or a value uniquely derived from the examples.

[0012] <Sunblock cosmetic> The sunblock cosmetic of the present invention contains at least component (A), component (B), component (C), and component (D). Hereinafter, each component will be described.

[0013] 〔Component (A)〕 Component (A) used in the present invention is an ultraviolet ray protecting agent and consists of at least one or more selected from ultraviolet absorbers and ultraviolet scattering agents, and is formulated for the purpose of an ultraviolet ray protecting effect. Component (A) is not particularly limited as long as it is an ultraviolet absorber or an ultraviolet scattering agent used in ordinary cosmetics.

[0014] For example, as the ultraviolet absorber, amyl para - dimethylbenzoate, 2 - ethylhexyl para - dimethylaminobenzoate, ethyl 4 - [N,N - bis(2 - hydroxypropyl)amino]benzoate, hexyl diethylaminohydroxybenzoyl benzoate, 2 - ethylhexyl salicylate, 2 - ethoxyethyl para - methoxycinnamate, 2 - ethylhexyl para - methoxycinnamate, glyceryl dipara - methoxycinnamate mono - 2 - ethylhexanoate, 2,4,6 - tris[4 - (2 - ethylhexyloxycarbonyl)anilino]-1,3,5 - triazine, octocrylene, 4 - t - butyl - 4'-methoxydibenzoylmethane, dimethyldiethylbenzalmalonate, bis - ethylhexyloxyphenol methoxyphenyltriazine, etc. may be mentioned. Preferably, hexyl diethylaminohydroxybenzoyl benzoate, 2 - ethylhexyl para - methoxycinnamate, 2,4,6 - tris[4 - (2 - ethylhexyloxycarbonyl)anilino]-1,3,5 - triazine, octocrylene, 4 - t - butyl - 4'-methoxydibenzoylmethane, bis - ethylhexyloxyphenol methoxyphenyltriazine; more preferably, 2 - ethylhexyl para - methoxycinnamate, bis - ethylhexyloxyphenol methoxyphenyltriazine.

[0015] Also, as the ultraviolet scattering agent, titanium oxide, zinc oxide, iron oxide, cerium oxide, tungsten oxide, zirconium oxide, aluminum oxide, etc. may be mentioned. Preferably, titanium oxide, zinc oxide; more preferably, micronized titanium oxide, zinc oxide. Note that micronized titanium oxide or zinc oxide means titanium oxide or zinc oxide with an average particle size of 0.1 μm or less. The average particle size is the average particle size (D50) measured by a laser scattering particle size distribution measuring device. The average particle size (D50) means the volume - based cumulative 50% particle size.

[0016] Also, these ultraviolet ray scattering agents are preferably those surface-treated with organic compounds such as fatty acids and silicones, or inorganic compounds such as silica, hydrous silica, and alumina, or both, and those surface-hydrophobized with fatty acids, silicones, etc. are more preferable. These ultraviolet ray scattering agents may be obtained and used alone, or commercially available products in which metal oxides are stably sub-particle-sized in a dispersion medium may be used. Examples of the dispersion medium used when sub-particle-sizing metal oxides include silicone oil, ester oil, hydrocarbon oil, polyhydric alcohols, water, etc. Examples of such commercially available products include "FLT-08", "FLT-11", "FLZ-03", "FLZ-06" manufactured by Teika Co., Ltd., "DIS-AB-10W", "DIF-AB-33W" manufactured by Sakai Chemical Industry Co., Ltd., etc. As component (A), one kind selected from these ultraviolet ray absorbers and ultraviolet ray scattering agents can be used alone or in combination of two or more kinds. From the viewpoints of ultraviolet ray protection effect and water resistance, it is preferably used in combination of two or more kinds, and more preferably used in combination of two or more kinds including both an ultraviolet ray absorber and an ultraviolet ray scattering agent. The content of component (A) in the present invention is 5 to 30% by mass, preferably 8 to 25% by mass, and more preferably 10 to 20% by mass in the total amount of the sunscreen cosmetic. If the content of component (A) is too small, sufficient ultraviolet ray protection effect and water resistance cannot be obtained. If it is too large, stickiness or irritation may occur, or water resistance and rub resistance may deteriorate due to a decrease in stability, or it may be difficult to wash off with a low-friction cleaning agent.

[0017] [Component (B)] Component (B) used in the present invention is a polyglycerol fatty acid ester, and any one can be used as long as it is used in ordinary cosmetics. The fatty acid in the polyglycerol fatty acid ester is preferably a fatty acid having 12 to 18 carbon atoms, more preferably a fatty acid having 18 carbon atoms. It is preferable to use an ester composed of polyglycerol having a polymerization degree of 4 or more and a fatty acid, and it is more preferable to use an ester composed of polyglycerol having a polymerization degree of 10 and a fatty acid. Further, the polyglycerol fatty acid ester used in the present invention is preferably an ester composed of a fatty acid having 12 or more carbon atoms, and more preferably one having an HLB of 8 or less.

[0018] Examples of such polyglycerol fatty acid esters include decaglyceryl pentalaurate, decaglyceryl pentamyristate, decaglyceryl pentapalmitate, decaglyceryl pentastearate, decaglyceryl pentaisostearate, decaglyceryl pentaoleate, decaglyceryl pentabehenate, and the like.

[0019] As component (B), preferably decaglyceryl pentastearate (HLB = 3.5 (reference value)), decaglyceryl pentaoleate (HLB = 3.5 (reference value)), and more preferably decaglyceryl pentastearate. These polyglycerol fatty acid esters may be obtained and used alone, or commercially available products compounded as emulsifiers may be used. Examples of such commercially available products include "Nicomuls 41" (a mixture of decaglyceryl pentastearate, behenyl alcohol, and sodium stearoyl lactate) manufactured by Nikko Chemicals Co., Ltd. In addition, one of these polyglycerol fatty acid esters can be used alone or in combination of two or more. Note that HLB is an abbreviation for Hydrophile-Lipophile Balance, which is a concept that quantifies the balance between hydrophilic and lipophilic groups of a compound. Generally, HLB is represented by a numerical value within the range of 0 to 20, and the larger the numerical value, the higher the hydrophilicity. The HLB value is determined by the Griffin method and can be specifically calculated by the following formula. HLB value = 20 × (molecular weight of hydrophilic group / molecular weight of the whole)

[0020] The content of component (B) in the present invention is 0.1 to 5% by mass, preferably 0.2 to 2% by mass, and more preferably 0.5 to 1% by mass in the total amount of the sunscreen cosmetic. If the content of component (B) is too small, water resistance and rub resistance cannot be obtained. If it is too large, stickiness may occur or it may be difficult to wash off with a low-friction cleanser.

[0021] [Component (C)] Component (C) used in the present invention is an anionic surfactant, and any one commonly used in ordinary cosmetics may be used. For example, alkyl sulfate salts, polyoxyethylene alkyl ether sulfates, alkyl amide ether sulfates, polyoxyethylene alkyl amide ether sulfates, polyoxyethylene alkyl ether acetates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, α-olefin sulfonates, higher fatty acid salts, acyl lactates, N-acyl amino acid salts, N-acyl isethionates, N-acyl methyl taurine salts, N-acyl polypeptide salts, alkyl sulfosuccinates, etc. may be mentioned.

[0022] As component (C), acyl lactates and N-acyl methyl taurine salts are preferred, and acyl lactates are more preferred. Further, as the acyl group in the acyl lactate and N-acyl methyl taurine salt, those having 8 or more carbon atoms are preferred. For example, 2-ethylhexanoyl group, lauroyl group, myristoyl group, palmitoyl group, stearoyl group, isostearoyl group, behenoyl group, oleoyl group, linoleoyl group, linolenoyl group, etc. may be mentioned. Examples of such anionic surfactants include sodium lauroyl lactate, sodium stearoyl lactate, sodium methyl taurine coconut oil fatty acid, etc. In the present invention, it is preferable to use sodium stearoyl lactate and sodium methyl taurine coconut oil fatty acid. In addition, these anionic surfactants can be used alone or in combination of two or more.

[0023] The content of component (C) in the present invention is 0.01 to 1% by mass, preferably 0.05 to 0.8% by mass, and more preferably 0.15 to 0.4% by mass in the total amount of the sunscreen cosmetic. If the content of component (C) is too small, water resistance cannot be obtained, and it becomes difficult to wash off with a low-friction cleanser. If it is too much, stickiness may occur, and water resistance and rub resistance may deteriorate due to a decrease in stability.

[0024] 〔Component (D)〕 Component (D) used in the present invention is an alkylene oxide derivative represented by the formula (1). Gly-[O{(PO)a(EO)b}-H]3···(1) In the formula (1), Gly is a residue obtained by removing a hydroxyl group from glycerin, PO is an oxypropylene group, EO is an oxyethylene group, a and b are the average addition molar numbers of PO and EO, respectively, where 0 ≦ a ≦ 70, 0 ≦ b ≦ 50, and 1 ≦ a + b ≦ 80. The addition form of PO and EO may be random or block, and in the case of block addition, the sequence order does not matter. By setting a to 70 or less, water resistance, rub resistance, and ease of washing off with a low-friction cleanser can be improved. Therefore, a is set to 0 to 70, preferably 5 to 50, and more preferably 10 to 30. By setting b to 50 or less, water resistance and rub resistance can be improved. Therefore, b is set to 0 to 50, preferably 0 to 40, and more preferably 0 to 30. By setting a + b to 1 or more and 80 or less, water resistance, rub resistance, and ease of washing off with a low-friction cleanser can be improved. Therefore, a + b is set to 1 to 80, preferably 5 to 70, and more preferably 10 to 30.

[0025] The alkylene oxide derivative represented by the above formula (1) has a structure in which the three hydroxyl groups of glycerin are substituted with -[O{(PO)a(EO)b}-H]. In other words, it is a structure in which an oxypropylene group and / or an oxyethylene group is added to the hydroxyl group of glycerin.

[0026] The content of component (D) in the present invention is 0.5 to 10% by mass, preferably 1 to 8% by mass, and more preferably 2 to 5% by mass in the total amount of the sunscreen cosmetic. If the content of component (D) is too small, water resistance and rub resistance cannot be obtained, and it becomes difficult to wash off with a low-friction cleanser. If it is too much, stickiness may occur, or water resistance and rub resistance may deteriorate due to a decrease in stability, and it may become difficult to wash off with a low-friction cleanser. Also, the ratio (B / D) of the blending amount (mass) of component (B) to component (D) is preferably 0.05 to 5, and more preferably 0.1 to 0.5. If B / D is too small, sufficient water resistance and rub resistance may not be obtained, and it may become difficult to wash off with a low-friction cleanser. If it is too large, it may become difficult to wash off with a low-friction cleanser. The total content of the above components (A), (B), (C) and (D) is preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 20% by mass or more with respect to the whole sunscreen cosmetic. Also, it is preferably 40% by mass or less, and more preferably 30% by mass or less.

[0027] 〔Water〕 In addition to the above components (A) to (D), the sunscreen cosmetic of the present invention usually contains water. As the water, water generally used for cosmetics or pharmaceuticals can be used. For example, ion-exchanged water, purified water, water for injection, etc. are preferably used. The content of water is usually 30 to 90% by mass, preferably 35 to 80% by mass, and more preferably 40 to 70% by mass in the total amount of the sunscreen cosmetic.

[0028] 〔Other components〕 In addition to the above components (A) to (D) and water, the sunscreen cosmetic of the present invention may contain, if necessary, other components commonly used in cosmetics or pharmaceuticals as long as the characteristics of the present invention are not impaired. Examples of other components include humectants such as polyhydric alcohols, hydrocarbon oils, ester oils, silicone oils and other oil agents, sequestering agents, pigments, preservatives, fragrances and the like. The content of other components is preferably 1 to 40% by mass, more preferably 5 to 30% by mass, based on the total amount of the sunscreen cosmetic. The sunscreen cosmetic of the present invention is prepared by adding the above components (A) to (D) and, if necessary, the above other components to water, mixing them, and then adjusting the total amount to 100% by mass with water so that each component has a desired content.

Examples

[0029] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples at all.

[0030] In the Examples and Comparative Examples, the following components were used. <Component (A)> · 2-Ethylhexyl paramethoxycinnamate (UV absorber, PALSOL-MCX manufactured by DSM Co., Ltd.) · Bis-ethylhexyloxyphenol methoxyphenyl triazine (UV absorber, Tinosorb-S manufactured by BASF) · Zinc oxide (micronized zinc oxide) (UV scatterer, FLZ-03 manufactured by Teika Co., Ltd., DIF-AB-33W manufactured by Sakai Chemical Industry Co., Ltd.) · Titanium dioxide (micronized titanium dioxide) (UV scatterer, MT-100Z manufactured by Teika Co., Ltd., DIS-AB-10W manufactured by Sakai Chemical Industry Co., Ltd.)

[0031] <Component (B)> · Decaglyceryl pentastearate (Manufactured by Nikko Chemicals Co., Ltd., NIKKOL Decaglyn 5-SV, Nikomuls 41) · Decaglyceryl pentaoleate (Manufactured by Nikko Chemicals Co., Ltd., NIKKOL Decaglyn 5-OV)

[0032] <(C) component> · Sodium stearoyl lactate (Manufactured by Nikko Chemicals Co., Ltd., Sodium stearoyl lactate, Nikomuls 41) · Sodium methyl taurate of coconut oil fatty acid (Manufactured by NOF Corporation, Diapon K-SF Powder)

[0033] <(D) component> · Polyoxypropylene glyceryl ether (16 P.O.) : Alkylene oxide derivative of formula (1) where a = 16 and b = 0 · Polyoxypropylene glyceryl ether (8 P.O.) : Alkylene oxide derivative of formula (1) where a = 8 and b = 0 · Polyoxypropylene glyceryl ether (50 P.O.) : Alkylene oxide derivative of formula (1) where a = 50 and b = 0 · Polyoxypropylene glyceryl ether (70 P.O.) : Alkylene oxide derivative of formula (1) where a = 70 and b = 0 · Polyoxyethylene polyoxypropylene glyceryl ether (24 E.O.)(24 P.O.) : Alkylene oxide derivative of formula (1) where a = 24 and b = 24 · Polyoxyethylene glyceryl ether (26 E.O.) : Alkylene oxide derivative of formula (1) where a = 0 and b = 26

[0034] <(D’) component> · Mixture of trimethylsiloxysilicic acid and cyclopentasiloxane (Silicone-based water-resistant film-forming agent, KF-7312J manufactured by Shin-Etsu Chemical Co., Ltd.) : Not applicable to formula (1)

[0035] [Examples 1 to 14, Comparative Examples 1 to 7] Using components (A) to (D), water, and other components shown in Table 3, sunscreen cosmetics were prepared with the compositions shown in Tables 1 and 2, and evaluations were performed according to the following evaluation criteria for (1) water resistance, (2) rub resistance in a wet state, and (3) ease of washing off with a foam cleanser.

[0036] (1) Water resistance To evaluate the persistence of the ultraviolet protection effect when the cosmetic film was wetted with water, in vitro SPF was measured using a UV-2000S SPF analyzer (manufactured by Labsphere) according to the following procedure. First, each sunscreen cosmetic was applied to a polymethyl methacrylate plate (manufactured by Helioscience) with a surface roughness of 6 μm so that it became 1.3 mg / cm 2 . After standing in the dark for 15 minutes, ultraviolet light was irradiated, and the initial SPF was measured. Then, ion-exchanged water was put into a cylindrical container with a bottom area of 330 cm 2 and a height of 25 cm to a water depth of 20 cm. The sample plate was vertically fixed at a position 10 cm below the water surface near the container wall so that the coated surface faced the center of the container. A flat stirring blade (blade diameter 6 cm, height 15 cm) was rotated at 60 rpm at the center of the container to generate a constant water flow. While maintaining the water temperature at 30°C, the sample plate was immersed in water for 80 minutes, and then naturally dried in a well-ventilated dark place for 30 minutes. The SPF after the water bath was measured. The maintenance rate of SPF before and after the water bath was calculated as "SPF maintenance rate (water bath) (%) = SPF after water bath / initial SPF × 100", and judged according to the following criteria. "◎" and "○" were judged as passing. <Evaluation criteria> ◎: SPF maintenance rate is 90% or more ○: SPF maintenance rate is 75% or more and less than 90% △: SPF maintenance rate is 50% or more and less than 75% ×: SPF maintenance rate is less than 50%

[0037] (2) Rub resistance in wet state To evaluate the persistence of the UV protection effect when friction is applied to a wet cosmetic film, in vitro SPF was measured using a UV-2000S SPF analyzer (manufactured by Labsphere, USA) according to the following procedure. First, each sunscreen was applied to a polymethyl methacrylate plate with a surface roughness of 6 μm (manufactured by Helioscience, France) to a thickness of 1.3 mg / cm 2 . The plate was irradiated with ultraviolet light, and the initial SPF was measured. After the sample plate was immersed in ion-exchanged water at 30 °C for 5 minutes and then dried, a 50 g weight was placed on it so as to sandwich a dry paper wiper (Kimwipe S-200, manufactured by Nippon Paper Crecia Co., Ltd., Japan), and the wiper was slid along with the weight to remove moisture. The SPF after rubbing was then measured. The retention rate of SPF before and after applying friction was calculated as "SPF retention rate (rubbing) (%) = SPF after rubbing / initial SPF × 100", and judged according to the following criteria. "◎" and "○" were judged as passing. <Evaluation criteria> ◎: SPF retention rate is 70% or more ○: SPF retention rate is 50% or more and less than 70% ×: SPF retention rate is less than 50%

[0038] (3) Ease of washing off with a foaming cleanser Twenty men and women (aged 18 - 57) were used as panelists, and the ease of washing off the sunscreen was evaluated according to the following procedure. First, 0.8 g of each sunscreen was evenly applied to the entire face, and the sunscreen was allowed to settle at room temperature (20 °C) for 15 minutes. Then, the cosmetic film was gently washed with a foaming facial cleanser, and the remaining feeling of the sunscreen after rinsing was scored according to the following evaluation criteria. The total score of the evaluations of the 20 panelists was calculated. If the total score was 20 or more, it was judged as a sunscreen that was easy to wash off. <Evaluation criteria> 2 points: No remaining feeling was felt. 1 point: A slight remaining feeling was felt. 0 point: A remaining feeling was felt. ◎: Total score is 30 or more ○: Total score is 20 or more and less than 30 △: Total score is 10 or more and less than 20 ×: Total score is less than 10

[0039]

Table 1

[0040]

Table 2

[0041]

Table 3

[0042] Regarding Examples 1 to 14, in any of the samples, a sunscreen cosmetic excellent in water resistance and rub resistance in a wet state and easily washed off with a foam detergent during washing was obtained. Regarding the water resistance evaluation, although there are some examples where the SPF retention rate exceeded 100%, it means that a higher value than the original SPF was obtained by contacting with water. The maintenance of the ultraviolet ray defensive power in the effects of the present invention includes the case where the SPF is improved in this way. On the other hand, for Comparative Examples 1 to 8, sufficient effects were not obtained. That is, in Comparative Example 1, since component (B) was not contained, it was insufficient in terms of water resistance and rub resistance in a wet state. In Comparative Example 2, since the content of component (B) was large, it was insufficient in terms of ease of washing off with a foam detergent. In Comparative Example 3, since component (C) was not contained, it was insufficient in terms of water resistance, rub resistance in a wet state, and ease of washing off with a foam detergent. In Comparative Example 4, since the content of component (C) was large, it was insufficient in terms of water resistance and rub resistance in a wet state. In Comparative Example 5, since component (D) was not contained, it was insufficient in terms of water resistance, rub resistance in a wet state, and ease of washing off with a foam detergent. In Comparative Example 6, since the content of component (D) was high, it was insufficient in terms of water resistance, rubbing resistance in a wet state, and ease of washing off with a foam detergent. In Comparative Example 7, instead of component (D), a trimethylsiloxysilicic acid and cyclopentasiloxane mixture, which is a film-forming agent, was blended as component (D’), but it was insufficient in terms of ease of washing off with a foam detergent.

[0043] 〔Formulation Example〕 Table 4 shows formulation examples of sunscreen creams.

[0044]

Table 4

Industrial Applicability

[0045] The sunscreen cosmetic of the present invention can exhibit unique effects that cannot be obtained with conventional sunscreen cosmetics. Specifically, in addition to water resistance during use and rubbing resistance in a wet state, it can also exhibit ease of washing off with a foam detergent during washing. Therefore, it can be widely expected to be applied to sunscreen cosmetics.

Claims

【Claim 1】 A sunscreen cosmetic comprising 5 to 30% by mass of the following component (A), 0.1 to 5% by mass of component (B), 0.01 to 1% by mass of component (C), and 0.5 to 10% by mass of component (D). (A) An ultraviolet light protector (B) Polyglycerin fatty acid ester (C) An anionic surfactant (D) An alkylene oxide derivative represented by the following formula (1) Gly-[O{(PO)a(EO)b}-H] ３ ...(1) (In formula (1), Gly is the residue obtained by removing a hydroxyl group from glycerin, PO is an oxypropylene group, EO is an oxyethylene group, a and b are the average number of moles of addition of PO and EO, respectively, where 0 ≦ a ≦ 70, 0 ≦ b ≦ 50, and 1 ≦ a + b ≦ 80. The addition form of PO and EO may be random or block, and in the case of block addition, the sequence order is not limited.)

Images