Oil-in-water emulsion sunscreen cosmetics

Abstract

To provide an oil-in-water emulsified sunscreen cosmetic having good spreadable sense of use and good temporal stability without stickiness due to an ultraviolet absorber.SOLUTION: There is provided an oil-in-water emulsified sunscreen cosmetic which comprises the following components (A) to (E): (A) 0.5 to 2.0 wt.% of sucrose stearate, (B) 0.05 to 1.0 wt.% of sodium methyl stearoyl taurate, (C) 1.0 to 5.0 wt.% of one or two or more higher alcohols selected from cetyl alcohol, stearyl alcohol and behenyl alcohol, (D) 1.5 to 5.0 wt.% of polyglyceryl-10 diisostearate and (E) 3.0 to 18.0 wt.% of an ultraviolet absorber.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion sunscreen cosmetic which is free from stickiness due to ultraviolet absorbents, has a good spreadability and good stability over time. [Background technology]

[0002] Sunburn caused by ultraviolet rays causes skin browning, loss of skin elasticity, and the formation of wrinkles, so cosmetics containing ultraviolet absorbers are used to prevent these. The ultraviolet rays that reach the earth alter the collagen and elastin fibers in the dermis, causing photoaging, which accelerates skin aging, and also causing sunburn, which causes the skin to redden. Therefore, protecting the skin from ultraviolet rays is one of the important functions of cosmetics.

[0003] Sunscreen cosmetics are used to protect the skin from the harmful effects of ultraviolet rays. Emulsion cosmetics are classified into water-in-oil and oil-in-water types. Water-in-oil types have excellent water resistance but can leave an unpleasant feeling when used, such as stickiness. Oil-in-water types are less likely to leave an unpleasant feeling when used, but are less effective at protecting the skin from ultraviolet rays than water-in-oil types.

[0004] One way to achieve high UV protection in oil-in-water emulsion sunscreen cosmetics is to incorporate a large amount of UV absorber. However, incorporating a large amount of UV absorber can lead to problems such as a sticky feel when used and poor stability over time. Furthermore, increasing the amount of surfactant to improve stability over time can lead to problems such as an even stickier feel when used and poor spreadability. There has been a demand for an oil-in-water emulsion sunscreen cosmetic that solves these problems and combines high UV protection with a non-sticky, easy-to-spread feel when used.

[0005] Prior art related to oil-in-water emulsion sunscreen cosmetics includes a technology for obtaining oil-in-water emulsion sunscreen cosmetics that are non-sticky and have a refreshing feel when used by combining UV absorbers including sulfonic acid group-containing water-soluble UV absorbers, bisethyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, and ethylhexyl triazone with polar oils, higher alcohols, and nonionic surfactants (Patent Document 1), and a technology for obtaining oil-in-water emulsion sunscreen cosmetics that are non-sticky while having high UV protection effects and excellent stability over time by combining salicylic acid-based liquid UV absorbers, alkyl silicone waxes, and low-viscosity silicone oils (Patent Document 2). However, while these technologies provide good stability over time and non-stickiness, they have not yet achieved the simultaneous achievement of good spreadability and a pleasant feel when used. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-145117 [Patent Document 2] Japanese Patent Publication No. 2020-111542 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide an oil-in-water emulsion sunscreen cosmetic which is free from stickiness due to ultraviolet absorbents, has a good spreadability and good stability over time. [Means for solving the problem]

[0008] That is, the present invention provides a composition comprising the following components (A) to (E): (A) 0.5 to 2.0% by weight of sucrose stearate (B) 0.05 to 1.0% by weight of sodium stearoyl methyl taurate (C) 1.0 to 5.0% by weight of one or more higher alcohols selected from cetyl alcohol, stearyl alcohol, and behenyl alcohol (D) 1.5 to 5.0% by weight of polyglyceryl-10 diisostearate and (E) 3.0 to 18.0% by weight of an ultraviolet absorber The present invention provides an oil-in-water emulsion sunscreen cosmetic comprising:

[0009] The present invention also provides an oil-in-water emulsion sunscreen cosmetic, wherein the HLB value of the component (A) sucrose stearate is 3-7.

[0010] The present invention also provides an oil-in-water emulsion sunscreen cosmetic, characterized in that 50% by weight or more of the higher alcohols of component (C) is behenyl alcohol. [Effects of the Invention]

[0011] It is possible to provide an oil-in-water emulsion sunscreen cosmetic which is free from stickiness due to an ultraviolet absorber, has good spreadability and good stability over time. DETAILED DESCRIPTION OF THE INVENTION

[0012] The content of sucrose stearate (component (A)) in the oil-in-water emulsion sunscreen cosmetic is preferably 0.5 to 2.0% by weight, more preferably 0.7 to 1.5% by weight. If it is less than 0.5% by weight, the stability over time may be poor. On the other hand, if it exceeds 2.0% by weight, the spreadability may be poor.

[0013] The HLB value of the sucrose stearate of component (A) is not particularly limited, but is preferably 3 to 7 from the viewpoints of stability over time, non-stickiness, and good spreadability. Furthermore, the present invention may contain one or more types of sucrose stearates with different HLB values. The HLB value of the sucrose stearates used in the present invention was determined by reference to the value listed in the catalog (Surfhope SE COSME, May 2001 (Mitsubishi Chemical Foods Corporation)). When two or more types of sucrose stearates are used, the HLB value can be calculated assuming additivity.

[0014] Specific examples of sucrose stearate products of component (A) include, but are not limited to, SurfHope SE COSME C-1800, SurfHope SE COSME C-1801, SurfHope SE COSME C-1802, SurfHope SE COSME C-1803, SurfHope SE COSME C-1805, SurfHope SE COSME C-1807, SurfHope SE COSME C-1809, SurfHope SE COSME C-1811, SurfHope SE COSME C-1815, and SurfHope SE COSME C-1816 (all manufactured by Mitsubishi Chemical Foods Corporation).

[0015] The content of sodium stearoyl methyl taurate (component (B)) in the oil-in-water emulsion sunscreen cosmetic is preferably 0.05 to 1.0 wt%, more preferably 0.2 to 0.7 wt%. If it is less than 0.05 wt%, the stability over time may be poor. On the other hand, if it exceeds 1.0 wt%, the cosmetic may feel sticky after use.

[0016] The content of component (C), one or more higher alcohols selected from cetyl alcohol, stearyl alcohol, and behenyl alcohol, is preferably 1.0 to 5.0 wt. % of the oil-in-water emulsion sunscreen cosmetic, and more preferably 2.0 to 4.0 wt. If it is less than 1.0 wt. %, the stability over time may be poor. On the other hand, if it exceeds 5.0 wt. %, the stability over time may be poor or the spreadability may be poor.

[0017] Furthermore, from the viewpoint of good spreadability, it is more preferable that 50% by weight or more of the higher alcohols of component (C) be behenyl alcohol.

[0018] The content of polyglyceryl-10 diisostearate (component (D)) in the oil-in-water emulsion sunscreen cosmetic is preferably 1.5 to 5.0% by weight, more preferably 2.5 to 4.0% by weight. If it is less than 1.5% by weight, the stability over time may be poor. On the other hand, if it exceeds 5.0% by weight, the spreadability may be poor.

[0019] The content of the ultraviolet absorber (component (E)) in the oil-in-water emulsion sunscreen cosmetic is preferably 3.0 to 18.0 wt.%, more preferably 3.0 to 15.0 wt.%. If it is less than 3.0 wt.%, the stickiness caused by the ultraviolet absorber, which is the object of the present invention, will not occur, but sufficient ultraviolet protection effect may not be obtained. On the other hand, if it exceeds 18.0 wt.%, the cosmetic may feel sticky after use.

[0020] The ultraviolet absorber of component (E) can be any ultraviolet absorber commonly used in cosmetics. Examples include, but are not limited to, ethylhexyl methoxycinnamate, octocrylene, dimethicone diethyl benzalmalonate, polysilicone-15, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylene bisbenzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethylhexyl salicylate, and ethylhexyl dimethyl PABA. These can be used alone or in combination as needed.

[0021] The oil-in-water emulsion sunscreen cosmetic of the present invention may contain various ingredients according to the intended use, such as anionic surfactants, cationic surfactants, nonionic surfactants, oils, preservatives, moisturizers, thickeners, colorants, sequestering agents, antioxidants, cosmetic ingredients, fragrances, refreshing agents, pH adjusters, etc., as appropriate, provided that the effects of the invention are not impaired.

[0022] The formulation of the oil-in-water emulsion sunscreen cosmetic of the present invention is not particularly limited, but examples thereof include emulsion and cream. [Example]

[0023] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. All contents in the examples are in wt %.

[0024] Oil-in-water emulsion sunscreen cosmetics were prepared with the compositions listed in Tables 1 to 10 below. After storage in a thermostatic chamber at 40°C for 6 months, the "stability over time" was evaluated by visually observing the appearance and observing the emulsion particles with an optical microscope (Olympus, BX53), and the evaluation was carried out according to the following criteria. Furthermore, a panel of 15 experts evaluated the "non-stickiness" and "ease of spreading" of each cosmetic product upon application. (Preparation method) 1. Heat Part A to 70°C and mix evenly. 2. Heat part B to 70°C and mix evenly. Then mix parts A and B and cool to 35°C. (Evaluation method) "Stability over time" was shown according to the following criteria. ⊚: No significant change in appearance, and no change in emulsified particles. ○: There is no significant change in appearance, but the emulsion particles have become larger. ×: Separation of oil was observed and changes in appearance were observed. The "non-stickiness" was evaluated by a specialist panel and shown according to the following criteria. ⊚: 13 or more people evaluated it as "not sticky." ○: 10 to 12 people evaluated it as "not sticky." △: 6 to 9 people evaluated it as "not sticky." ×: Five or fewer people rated it as "not sticky." The "ease of spreading" was evaluated by a specialist panel and shown according to the following criteria. ◎: 13 or more people rated it as "easy to spread." ○: 10 to 12 people rated it as "easy to spread." △: 6 to 9 people rated it as "easy to spread." ×: Five or fewer people rated it as "good spreadability."

[0025] Examples 1 to 39, Comparative Examples 1 to 20 Oil-in-water sunscreen cream [Table 1] *1: MT-100Z (manufactured by Teika) *2: ELEFAC I-205 (manufactured by Nikko Chemicals) *3: Nomcoat TAB (manufactured by Nisshin Oillio Co., Ltd.) *4: KF-56A (Shin-Etsu Chemical Co., Ltd.) *5: Surf Hope SE COSME C-1805 (Mitsubishi Chemical Foods) *6: Behenyl alcohol (Kyushu Alcohol Kogyo Co., Ltd.) *7: Echogum T (manufactured by CP Kelco US) *8: 1,3-butylene glycol (manufactured by Daicel Chemical Industries, Ltd.) *9: Mekkins-M (Ueno Pharmaceutical Co., Ltd.) *10: NIKKOL SMT (manufactured by Nikko Chemicals) *11: NIKKOL Decaglyn 2-ISV (manufactured by Nikko Chemicals)

[0026] The results in Table 1 show that cosmetics containing sucrose stearate in the amounts shown in Examples 1 to 4 were stable over time, non-sticky, and spread easily. On the other hand, Comparative Example 1, in which the sucrose stearate content was less than the specified amount, had poor stability over time, and Comparative Example 2, in which the sucrose stearate content exceeded the specified amount, had poor spreadability.

[0027] [Table 2] *12: Surf Hope SE COSME C-1801 (Mitsubishi Chemical Foods) *13: Surf Hope SE COSME C-1816 (Mitsubishi Chemical Foods)

[0028] The results in Table 2 show that cosmetics with excellent stability over time, non-stickiness, and good spreadability can be obtained even when sucrose stearate with different HLB values ​​is added, as shown in Examples 5 to 15. Furthermore, it was found that cosmetics with even better stability over time, non-stickiness, and good spreadability can be obtained when the HLB value of the sucrose stearate is set to 3 to 7.

[0029] [Table 3] *14: Surf Hope SE COSME C-1205 (Mitsubishi Chemical Foods) *15: NIKKOL Decaglyn 5-SV (Nikko Chemicals) *16: GLUCATE SS EMULSIFIER (manufactured by Lubrizol) *17: NIKKOL Decaglyn 5-HS (Nikko Chemicals) *18: NIKKOL MGS-AV (manufactured by Nikko Chemicals) *19: NIKKOL SS-10V (Nikko Chemicals) *20: NIKKOL Hexaglyn 1-SV (Nikko Chemicals)

[0030] Ingredients containing other surfactants instead of sucrose stearate were investigated. The results are shown in Table 3. As shown in Comparative Example 3, the inclusion of sucrose laurate resulted in poor stability over time. As shown in Comparative Example 4, the inclusion of polyglyceryl-10 pentastearate resulted in poor spreadability. As shown in Comparative Example 5, the inclusion of methyl glucose sesquistearate resulted in poor stability over time and a sticky feel when used. As shown in Comparative Example 6, the inclusion of polyglyceryl-10 pentahydroxystearate resulted in a sticky feel when used. As shown in Comparative Example 7, the inclusion of glyceryl stearate resulted in poor stability over time and poor spreadability. As shown in Comparative Example 8, the inclusion of sorbitan stearate resulted in poor stability over time and poor spreadability. As shown in Comparative Example 9, the inclusion of polyglyceryl-6 stearate resulted in a sticky feel when used and poor spreadability.

[0031] [Table 4]

[0032] The results in Table 4 show that when sodium stearoyl methyl taurate was contained in the amounts shown in Examples 16 to 19, the cosmetic preparations had excellent stability over time, were not sticky, and spread easily in use. On the other hand, in Comparative Example 10, in which the content of sodium stearoyl methyl taurate was less than the specified amount, the stability over time was poor, and in Comparative Example 11, in which the content of sodium stearoyl methyl taurate exceeded the specified amount, the cosmetic preparations had a sticky feel in use.

[0033] [Table 5] *21: Sodium stearoyl lactylate (manufactured by Nikko Chemicals) *22: Amisoft HS-11P (manufactured by Ajinomoto Co., Ltd.)

[0034] In place of sodium stearoyl methyl taurate, other types of surfactants were added. The results are shown in Table 5. As shown in Comparative Example 12, the addition of sodium stearoyl lactinate resulted in poor spreadability, and as shown in Comparative Example 13, the addition of sodium stearoyl glutamate resulted in a sticky feel when used.

[0035] [Table 6]

[0036] The results in Table 6 show that cosmetics containing the higher alcohol behenyl alcohol in the amounts shown in Examples 20 to 23 were stable over time, non-sticky, and spread easily. On the other hand, Comparative Example 14, in which the content of the higher alcohol behenyl alcohol was less than the specified amount, exhibited poor stability over time, and Comparative Example 15, in which the content of the higher alcohol behenyl alcohol exceeded the specified amount, exhibited poor stability over time and poor spreadability.

[0037] [Table 7] *23: Stearyl Alcohol NX (Kyukyu Alcohol Kogyo Co., Ltd.) *24: Cetyl Alcohol NX (Kyukyu Alcohol Kogyo Co., Ltd.)

[0038] The results in Table 7 show that, as in Example 24, the inclusion of stearyl alcohol as the higher alcohol results in a cosmetic preparation that is stable over time, non-sticky, and spreads easily. Furthermore, as in Example 25, the inclusion of cetyl alcohol as the higher alcohol results in a cosmetic preparation that is stable over time, non-sticky, and spreads easily. Furthermore, as in Examples 26 to 28, when part of the stearyl alcohol was replaced with behenyl alcohol, it was found that when 50% by weight or more of the higher alcohol was behenyl alcohol, the evaluation of spreadability was further improved. Furthermore, as in Examples 29 to 31, when part of the cetyl alcohol was replaced with behenyl alcohol, it was found that when 50% by weight or more of the higher alcohol was behenyl alcohol, the evaluation of spreadability was further improved.

[0039] [Table 8]

[0040] The results in Table 8 show that cosmetics containing polyglyceryl-10 diisostearate in the amounts shown in Examples 32 to 35 were stable over time, non-sticky, and spread easily. On the other hand, Comparative Example 16, in which the content of polyglyceryl-10 diisostearate was less than the specified amount, exhibited poor stability over time, and Comparative Example 17, in which the content of polyglyceryl-10 diisostearate exceeded the specified amount, exhibited poor spreadability.

[0041] [Table 9] *25: NIKKOL Decaglyn 1-IS (Nikko Chemicals) *26: NIKKOL Decaglyn 2-SV (Nikko Chemicals)

[0042] An investigation was conducted into the inclusion of other types of surfactants instead of polyglyceryl-10 diisostearate. The results are shown in Table 9. As shown in Comparative Example 18, when polyglyceryl-10 isostearate was added, the stability over time deteriorated, and as shown in Comparative Example 19, when polyglyceryl-10 distearate was added, the stability over time deteriorated.

[0043] [Table 10]

[0044] The results in Table 10 show that when the UV absorber ethylhexyl methoxycinnamate was contained in the amounts shown in Examples 36 to 39, the cosmetic preparations had excellent stability over time, were not sticky, and spread easily. On the other hand, in Comparative Example 20, where the content of the UV absorber ethylhexyl methoxycinnamate exceeded the specified amount, the cosmetic preparations had a sticky feel.

[0045] Below are examples of oil-in-water emulsion sunscreen cosmetics that are free from stickiness due to UV absorbers, spread easily in use, and have good stability over time. All of them obtained satisfactory results in the same evaluations as above.

[0046] Example 40 Oil-in-water daytime moisturizing cream (Ingredient name) Weight (%) (Part A) (1) Silicone-coated titanium dioxide 3.0 (2) Zinc oxide 2.0 (3) Octocrylene*27 8.0 (4) Bis-ethylhexyloxyphenol methoxyphenyl triazine*28 1.5 (5) t-Butyl methoxydibenzoylmethane*29 1.0 (6) Alkyl benzoate (C12-15) 7.0 (7) Diphenylsiloxyphenyl Trimethicone 7.0 (8) Hydroxystearic acid hydrogenated castor oil 1.0 (9) Sucrose stearate (HLB: 5) *5 1.0 (10) Behenyl alcohol *6 2.0 (11) Stearyl alcohol *23 1.0 (12) Cetyl alcohol *24 0.5 (13) Flavoring (appropriate amount) (Part B) (14) Remaining purified water (15) Xanthan gum 0.4 (16) Sodium hyaluronate 0.1 (17) Diglycerin 2.0 (18) Dipropylene glycol 10.0 (19) 1,3-butylene glycol 2.0 (20) Methylparaben 0.3 (21) Sodium Stearoyl Methyl Taurate*10 0.3 (22) Polyglyceryl-10 diisostearate*11 3.0 (23) Polyquaternium-39 10% aqueous solution 0.5 (24) Green tea extract 0.2 Total 100.0 *27: Eusolex OCR (Merck) *28: TINOSORB S (BASF) *29: PARSOL 1789 (manufactured by DSM) (Manufacturing method) 1. Heat Part A to 70°C and mix evenly. 2. Heat part B to 70°C and mix evenly, then mix parts A and B together and cool to 35°C.

[0047] Example 41 Oil-in-water daytime moisturizing cream (Ingredient name) Weight (%) (Part A) (1) Dimethyl PABA ethylhexyl *30 10.0 (2) Diethylaminohydroxybenzoylhexyl benzoate*31 2.0 (3) Oxybenzone-3*32 0.5 (4) Alkyl benzoate (C12-15) 7.0 (5) Isotridecyl isononanoate 9.0 (6) Sucrose stearate (HLB: 5) *5 1.3 (7) Stearyl alcohol*23 2.3 (8) Flavoring (appropriate amount) (Part B) (9) Remaining purified water (10) Xanthan gum 0.43 (11) Sodium hyaluronate 0.05 (12) Glycerin 5.0 (13) 1,3-butylene glycol 12.0 (14) Methylparaben 0.2 (15) Sodium Stearoyl Methyl Taurate*10 0.5 (16) Polyglyceryl-10 diisostearate*11 2.5 Total 100.0 *30: Escarol 507 (manufactured by Bantike) *31: Uvinul A Plus Granular (BASF) *32: SEESORB 101 (Shipro Chemicals) (Manufacturing method) 1. Heat Part A to 70°C and mix evenly. 2. Heat part B to 70°C and mix evenly, then mix parts A and B together and cool to 35°C. [Industrial Applicability]

[0048] According to the present invention, it is possible to provide an oil-in-water emulsion sunscreen cosmetic that is free from stickiness due to an ultraviolet absorber, spreads easily in use, and has good stability over time.

Claims

1. An oil-in-water emulsion sunscreen cosmetic comprising the following components (A) to (E): (A) 0.5 to 2.0% by weight of sucrose stearate (B) 0.05 to 1.0% by weight of sodium stearoyl methyl taurate (C) 1.0 to 5.0% by weight of one or more higher alcohols selected from cetyl alcohol, stearyl alcohol, and behenyl alcohol (D) 1.5 to 5.0% by weight of polyglyceryl-10 diisostearate (E) 3.0 to 18.0% by weight of an ultraviolet absorber

2. 2. The oil-in-water emulsion sunscreen cosmetic according to claim 1, wherein the HLB value of the sucrose stearate of component (A) is 3 to 7.

3. 3. The oil-in-water emulsion sunscreen cosmetic according to claim 1, wherein at least 50% by weight of the higher alcohol of component (C) is behenyl alcohol.

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