JP2023183089A - Water-in-oil sunscreen cosmetic - Google Patents

Abstract

To provide a water-in-oil sunscreen cosmetic that has a UV protection effect while suppressing the amount of UV scattering agent added, does not easily come off even when sweating, and can suppress uneven application of the cosmetic.SOLUTION: A water-in-oil sunscreen cosmetic contains: (A) 0.5 to 10 mass% of an alkylene oxide derivative represented by formula (1); (B) 5 to 35 mass% of a UV scattering agent; (C) 0.1 to 5 mass% of dextrin fatty acid ester or sucrose fatty acid ester; and (D) 0.1 to 5 mass% of cationic modified clay mineral (in formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms; EO represents an oxyethylene group; a represents the number of moles of AO added; b represents the number of moles of EO added; a represents a number from 0 to 50; b represents a number from 1 to 50; a+b≥10; and 0≤a/b≤2 ).SELECTED DRAWING: None

Description

The present invention relates to water-in-oil sunscreen cosmetics.

Protecting the skin from damage caused by ultraviolet rays is an important issue in skin care and body care, and various sunscreen cosmetics have been developed. Sunscreen cosmetics use UV absorbers and UV scattering agents that have the ability to protect against UV rays, but when UV scattering agents are used in high concentrations to achieve a high level of sunscreen effect, they can cause squeaks and white casts after application. There were such issues. In order to obtain a comfortable feel and usability, as well as a good UV protection effect, it is necessary to reduce the amount of UV scattering agent added.

Since the continuous phase of water-in-oil cosmetics is oil, they have advantages such as being less prone to the harsh feeling inherent in ultraviolet scattering agents and having excellent water resistance.

For example, in Patent Document 1, oil-in-water type or Water-in-oil type sunscreen cosmetics have been proposed.

Furthermore, sunscreen cosmetics are often used as a base before applying makeup. In particular, if water-in-oil type sunscreen cosmetics are applied before applying makeup cosmetics such as foundations that often contain oil-absorbing powders, the oil content of the sunscreen cosmetics will be absorbed and the applied film will be damaged. Occasionally, uneven coating occurred.

Patent Document 2 proposes a water-in-oil emulsion cosmetic that is a combination of a vinyl polymer having a carbosiloxane dendrimer structure in its side chain, a hydrophobized powder, and a pentaerythritol fatty acid ester, and which adheres well to foundation. .

Japanese Patent Application Publication No. 2010-222349 Japanese Patent Application Publication No. 2016-160191

Patent Document 1 proposes a water-in-oil sunscreen cosmetic that is excellent in usability, stability, and the like. However, water-in-oil type cosmetics tend to become sticky due to the feel of the oil. Furthermore, when sweating in the summer, sweat contains water and salt, which causes re-emulsification, which can cause the coating film to collapse (cosmetic material to come off). The water-in-oil type sunscreen cosmetic proposed in Patent Document 1 was insufficient in terms of resistance to removal when sweating and improvement in UV protection effect.

In addition, Patent Document 2 proposes a water-in-oil emulsion cosmetic that adheres well to foundation when used as a base before applying makeup, and this water-in-oil emulsion cosmetic is applied to UV protection cosmetics, etc. It is said that it is possible. However, the water-in-oil emulsion cosmetic proposed in Patent Document 2 was insufficient in terms of difficulty in removing it when sweating.

In view of the above-mentioned problems, the present invention uses SPF improving ingredients to suppress the amount of UV scattering agents, while increasing the UV protection effect, making it difficult to remove when sweating, and suppressing uneven application of makeup cosmetics such as foundation. The purpose of the present invention is to provide a water-in-oil type sunscreen cosmetic that can be used as a water-in-oil type sunscreen cosmetic.

As a result of intensive studies in view of the above-mentioned problems, the present inventors have found that by combining a UV scattering agent, a fatty acid ester of dextrin or sucrose, a cation-modified clay mineral, and an alkylene oxide derivative with a specific structure in predetermined amounts, the above-mentioned The present inventors have discovered that a water-in-oil sunscreen cosmetic can be obtained that can solve the problems, and have completed the present invention.

That is, the present invention contains 0.5 to 10% by mass of the following component (A), 5 to 35% by mass of component (B), 0.1 to 5% by mass of component (C), and 0% of component (D). The present invention relates to a water-in-oil sunscreen cosmetic containing 1 to 5% by mass.
(A) Alkylene oxide derivative represented by the following formula (1)

In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms, and b represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms. Indicates the number of moles of oxyethylene group added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a/b≦2. When the alkylene oxide derivative represented by formula (1) has both the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are: They are added randomly or in blocks, and if they are added in blocks, the order of arrangement does not matter.
(B) Ultraviolet scattering agent (C) Dextrin fatty acid ester or sucrose fatty acid ester (D) Cation modified clay mineral

According to the water-in-oil sunscreen cosmetic of the present invention, the SPF-improving ingredient suppresses the amount of UV scattering agent and increases the UV protection effect, making it difficult to remove when sweating, and making it easy to apply makeup cosmetics such as foundation. Unevenness can be suppressed.

Embodiments of the present invention will be described below. In this specification, the 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.

The sunscreen cosmetic of the present invention contains at least component (A), component (B), component (C), and component (D). Each component will be explained below.

[Component (A)]
Component (A) is an alkylene oxide derivative represented by formula (1).

In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms, and b represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms. Indicates the number of moles of the oxyethylene group EO added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a/b≦2. The oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added randomly or in blocks, and in the case of block addition, the arrangement order does not matter.

By setting a to 50 or less, it is possible to improve the SPF improvement effect and the difficulty in removing the product when sweating, and to reduce stickiness. Therefore, a is set to 0 to 50, preferably 0 to 40, and most preferably 0 to 30.

By setting b to 1 or more, the SPF improvement effect and the effect of suppressing uneven makeup application are improved. Further, by setting b to 50 or less, it is possible to improve the resistance to falling off when sweating. Therefore, b is set to 1 to 50, preferably 10 to 40, and more preferably 10 to 30.

By setting a+b to 10 or more, the effect of suppressing uneven makeup application can be improved. Therefore, a+b is set to be 10 or more, and most preferably 20 or more. The upper limit of a+b is not particularly limited, but from the viewpoint of improving the SPF improvement effect, it is preferably 50 or less.

When a is larger than 0, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added randomly or in blocks. When added in blocks, the order of arrangement does not matter. When a is larger than 0, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are preferably added in a random manner.

By setting a/b to 2 or less, it is possible to reduce stickiness, improve the effect of improving SPF and the difficulty in removing makeup when sweating, and suppress uneven application of makeup. Therefore, a/b is set to be 2 or less, and most preferably 1.2 or less. The lower limit of a/b is 0, but may be set to 0.3 or more.

Examples of the oxyalkylene group having 3 to 4 carbon atoms include oxypropylene group and oxybutylene group, and oxypropylene group is most preferred. Note that the alkylene oxide derivative represented by formula (1) may have only one of an oxypropylene group and an oxybutylene group, or may have both of these groups. When having both of these, the oxypropylene group and oxybutylene group may be either random or block-like. When added in blocks, the order of arrangement does not matter.

The alkylene oxide derivative represented by formula (1) has a monoether structure in which alkylene oxide is added to the 1-position hydroxyl group among the three hydroxyl groups of glycerin. The monoether purity is 80% or more, preferably 90% or more, and more preferably 95% or more. The upper limit of the monoether purity is not particularly limited, but can be 100% or less.

The monoether purity can be calculated from the following formula using the peak integral value obtained by ¹ H-NMR measurement.

X is approximately 2.3 ppm derived from the methylene group at the 1 and 3 positions of glycerin to which ethylene oxide has been added, when the integral value of approximately 3.3 ppm derived from the methine group at the 2 position of glycerol detected only in the monoether form is taken as 1. The peak integral value near 4 ppm is shown. However, if the peak integral value of about 3.3 ppm derived from the methine group at the 2-position of glycerin in the monoether cannot be detected, the purity of the monoether is set to 0.

The alkylene oxide derivative represented by formula (1) of the present invention can be produced by a known method. An alkylene oxide is addition-polymerized to an alkyl alcohol, such as isopropylidene glycol in which all but one hydroxyl group of glycerin is protected, at 50 to 160° C. and 0.5 MPa (gauge pressure) or less under an alkali catalyst. When using two or more types of alkylene oxide, in the case of a random type, addition polymerization is carried out after mixing two or more types of alkylene oxide in advance, and in the case of a block type, even if EO is polymerized after polymerizing AO, EO AO may be polymerized after polymerizing AO. After that, an acid such as hydrochloric acid, phosphoric acid, or acetic acid is added to perform deacetalization, and excess acid is neutralized with a base such as potassium hydroxide or sodium hydroxide, and water and neutralized salts are further removed. In this way, an alkylene oxide derivative can be obtained.

The concentration of component (A) added is 0.5 to 10% by weight, preferably 1 to 8% by weight, more preferably 1.5 to 5% by weight based on the total weight of the water-in-oil sunscreen cosmetic. %. By increasing the content of component (A), it is possible to improve the SPF effect, improve the difficulty in removing makeup when sweating, and suppress uneven application of makeup. By not making the content of component (A) excessive, it is possible to reduce the effect of suppressing uneven makeup application and to suppress the occurrence of stickiness.

[Component (B)]
Component (B) is an ultraviolet scattering agent. The term "ultraviolet scattering agent" refers to particulate matter that can reflect and scatter ultraviolet rays to protect the skin, etc. from ultraviolet rays. Examples of materials for the ultraviolet scattering agent that can be used in the present invention include titanium oxide, zinc oxide, iron oxide, zirconium oxide, and aluminum oxide. Further, fine particles or composites of these materials may be used as the ultraviolet scattering agent. It is preferable that one or two selected from titanium oxide and zinc oxide be included because of their high ultraviolet reflection and scattering effects.

The titanium oxide and zinc oxide used as the ultraviolet scattering agent may be titanium oxide and zinc oxide commonly used in cosmetics. Preferably, a composition with better dispersibility, for example, one whose surface has been subjected to a surface treatment, specifically, a hydrophobization treatment, by a known method, if necessary, can be contained in the skin composition.

Surface treatment methods include silicone treatment such as methylhydrogenpolysiloxane and methylpolysiloxane; fluorine treatment with perfluoroalkyl phosphate and perfluoroalcohol; amino acid treatment with N-acylglutamic acid; octyltriethoxysilane and octyl Examples include treatment with alkyl alkoxysilane such as trimethoxysilane; treatment with lecithin; treatment with metal soap; treatment with fatty acid; treatment with alkyl phosphate ester.

Component (B) is preferably made into fine particles with an average primary particle size of 8 to 80 nm, more preferably 10 to 30 nm.

The concentration of component (B) added is 5 to 35% by weight, preferably 10 to 30% by weight, and more preferably 15 to 25% by weight, based on the total weight of the water-in-oil sunscreen cosmetic. By increasing the content of component (B), a sufficient ultraviolet protection effect can be obtained as a sunscreen cosmetic. By not making the content of component (B) excessive, uneven application of makeup is less likely to occur, and deterioration in the feeling of use, such as squeaks and white casts, can be suppressed.

[Component (C)]
Component (C) is a dextrin fatty acid ester or a sucrose fatty acid ester.

The dextrin fatty acid ester used in the present invention is an ester of fatty acid and dextrin. The above fatty acid is preferably a linear or branched saturated or unsaturated fatty acid having 8 to 24 carbon atoms. The average degree of polymerization of dextrin is preferably 10-50, more preferably 20-30.

Specific examples of dextrin fatty acid esters include dextrin palmitate, dextrin stearate, dextrin oleate, dextrin isostearate, dextrin myristate, dextrin palmitate/2-ethylhexanoate, and the like.

Furthermore, the sucrose fatty acid ester used in the present invention is an ester of fatty acid and sucrose. The above fatty acid is preferably a linear or branched saturated or unsaturated fatty acid having 8 to 30 carbon atoms, more preferably 18 to 22 carbon atoms.

Specific examples of sucrose fatty acid esters include sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, and sucrose oleate. Mention may be made of esters.

As component (C), one type or two or more types selected from these can be used. From the viewpoint of suppressing uneven makeup application, palmitic acid dextrin is preferred.

The concentration of component (C) added is 0.1 to 5% by mass, preferably 0.5 to 3% by mass, more preferably 0.5 to 3% by mass, based on the total mass of the water-in-oil sunscreen cosmetic. It is 2% by mass. By increasing the content of component (C), the SPF improvement effect is improved, and the effect of suppressing the difficulty of removing makeup when sweating and the uneven application of makeup is sufficiently increased. By not making the content of component (C) excessive, it is possible to reduce the feeling of stickiness during use, improve the difficulty in removing makeup when sweating, and make it easier to suppress uneven application of makeup.

[Component (D)]
Component (D) is a cationically modified clay mineral. Component (D) is preferably a cationically modified clay mineral substituted with quaternary ammonium ions. Component (D) is not limited as long as it is used in ordinary cosmetics, but layered clay minerals such as bentonite, laponite, hectorite, montmorillonite, and magnesium aluminum silicate can be used as a quaternary ammonium salt type cationic surfactant. Preferably, those treated with

Specific examples of component (D) include dimethyldistearylammonium hectorite, dimethyldistearylammonium bentonite, benzyldimethylstearylammonium hectorite, and magnesium aluminum silicate treated with distearyldimethylammonium chloride. From the viewpoint of suppressing uneven makeup application, dimethyl distearyl ammonium hectorite is preferred.

Specific examples of quaternary ammonium salt type cationic surfactants include dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, myristyldimethylethylammonium chloride, and cetyldimethylethyl Ammonium chloride, stearyldimethylethylammonium chloride, behenyldimethylethylammonium chloride, myristyldiethylmethylammonium chloride, cetyldiethylmethylammonium chloride, stearyldiethylmethylammonium chloride, behenyldiethylmethylammonium chloride, benzyldimethylmyristylammonium chloride, benzyldimethylcetylammonium chloride , benzyldimethylstearylammonium chloride, benzyldimethylbehenylammonium chloride, benzylmethylethylcetylammonium chloride, benzylmethylethylstearylammonium chloride, distearyldimethylammonium chloride, dibehenyldihydroxyethylammonium chloride, and bromide in place of the chloride of each of the above compounds. Examples include compounds such as dipalmitylpropylethylammonium methyl sulfate.

The concentration of component (D) added is 0.1 to 5%, preferably 0.5 to 3%, more preferably 1 to 2%, based on the total mass of the water-in-oil sunscreen cosmetic. . By increasing the content of component (D), the SPF improving effect is improved and the effect of suppressing uneven makeup application can be sufficiently obtained. By not having an excessive content of component (D), the SPF improving effect is improved, the difficulty of removing makeup when sweating is sufficiently increased, and the effect of suppressing uneven makeup application is sufficiently obtained, making it possible to improve the effectiveness of cosmetics. stability is less likely to decrease.

[Other ingredients]
The sunscreen cosmetic composition of the present invention usually contains water in addition to the above components (A) to (D). Examples of water include purified water, tap water, industrial water, deionized water, and the like. The concentration of water added in the sunscreen composition of the present invention is usually 5 to 60% by mass, preferably 10 to 55% by mass, more preferably 15% by mass, based on the total mass of the water-in-oil sunscreen cosmetic. ~50% by mass.

The sunscreen cosmetic of the present invention can be used in cosmetics, quasi-drugs, pharmaceuticals, etc., in addition to the above ingredients (A) to (D) and water, if necessary, to the extent that the purpose of the present invention is not impaired. It may also contain additives.

Examples of such additives include ultraviolet absorbers, surfactants (excluding component (C)), and the like. Examples of the ultraviolet absorber include amyl paradimethylbenzoate, 2-ethylhexyl paradimethylaminobenzoate, ethyl 4-[N,N-di(2-hydroxypropyl)amino]benzoate, hexyl diethylaminohydroxybenzoylbenzoate, 2-ethylhexyl salicylate, 2-ethoxyethyl para-methoxycinnamate, 2-ethylhexyl para-methoxycinnamate, glyceryl mono-2-ethylhexanoate di-paramethoxycinnamate, 2,4,6-tris[4-( 2-ethylhexyloxycarbonyl)alinino]-1,3,5-triazine, octocrylene, 4-t-butyl-4'-methoxydibenzoylmethane, dimethicodiethylbenzalmalonate, bisethylhexyloxyphenolmethoxyphenyltriazine, etc. can be mentioned. These ultraviolet absorbers can be used by appropriately selecting one type or two or more types as required.

As the surfactant, surfactants with HLB 3 to 7 are preferred, such as PEG-9 polydimethylsiloxyethyl dimethicone, PEG-10 dimethicone, glyceryl oleate, glyceryl isostearate, polyglyceryl-2 oleate, and polyglyceryl stearate. 2nd prize is mentioned.

When the water-in-oil sunscreen cosmetic of the present invention contains other ingredients, the content of the other ingredients based on the total weight of the water-in-oil sunscreen cosmetic is preferably 30% by mass or less, and more Preferably it is 0.01% by mass to 20% by mass.

The water-in-oil sunscreen cosmetic of the present invention is formed by emulsifying an oily component and an aqueous phase component, and can be produced according to a commonly used method. For example, an oily component such as an oil agent and component (C) are mixed and dissolved, components (B) and (D) are added while stirring, and then component (A) etc. is mixed and dissolved in water. It can be produced by adding and emulsifying aqueous phase components.

The water-in-oil sunscreen cosmetic composition of the present invention can be provided in forms suitable for various uses, for example, as an emulsion, cream, gel, etc.

The present invention will be explained in detail below by giving Examples and Comparative Examples.

[Examples 1 to 11, Comparative Examples 1 to 7]
<Synthesis Example 1: Example Compound A-1>
100 g of isopropylidene glycol and 0.5 g of potassium tert-butoxide as a catalyst were charged into an autoclave, and after replacing the air in the autoclave with dry nitrogen, the catalyst was dissolved at 130° C. with stirring. Subsequently, 866 g of ethylene oxide was added dropwise using a dropping device at 130° C. and 0.2 to 0.5 MPa (gauge pressure), and the mixture was stirred for 1 hour. Thereafter, the reaction composition was taken out from the autoclave, and the pH was adjusted to 3 with hydrochloric acid to perform deacetalization. Thereafter, the mixture was neutralized with potassium hydroxide, treated at reduced pressure of -0.095 MPa (gauge pressure) and 100° C. for 3 hours to remove contained water, and filtered to obtain Example Compound A-1.

<Synthesis Examples 2 to 3: Example Compound A-2, Comparative Example Compound A'-1>
Example compound A-2 and comparative example compound A'-1 were obtained in the same manner as in Synthesis Example 1, except that the amounts of ethylene oxide, propylene oxide, and butylene oxide added were changed. However, in the case of a random adduct such as Comparative Example Compound A'-1, ethylene oxide and propylene oxide or butylene oxide were mixed in advance and added dropwise using a dropping device to perform the reaction. In the case of a block adduct such as Example Compound A-2, propylene oxide is added dropwise to a predetermined number of moles to be added using a dropping device to cause a reaction, and then ethylene oxide is added to a predetermined number of moles to be added. The reaction was carried out by dropping using a dropping device.

In addition, the number average molecular weight of the ethylene oxide and propylene oxide adducts was determined from the hydroxyl value obtained by hydroxyl value measurement according to JIS K1557-1, and the values of a and b in formula (1) were determined from the number average molecular weight. Table 1 shows the average number of added moles of ethylene oxide and propylene oxide in Example Compounds A-1 to A-2 and Comparative Example Compound A'-1. In addition, "AO" in Table 1 indicates the type of oxyalkylene group (AO) possessed by the alkylene oxide derivative shown in formula (1), and "PO" indicates an oxypropylene group, respectively. Table 1 also shows the monoether purity calculated by the method described above.

〔Evaluation methods〕
Water-in-oil sunscreen makeup was prepared using ingredients (A) to (D), (A'), (D'), and other ingredients as shown in Tables 2 to 3 (Examples) and Table 4 (Comparative Examples). The following evaluation criteria were used to evaluate (1) SPF improvement effect, (2) difficulty in removing the foundation when sweating, and (3) uneven foundation application. The compound composition of component (A) used in the evaluation is shown in Table 1.

(1) SPF improvement effect For each cosmetic shown in Examples and Comparative Examples, a blank containing no component (A) or component (A') was prepared, and each sample was placed on a PMMA plate (HELIOPLATE HD6 manufactured by Labsphere). After applying 2 mg/cm ² to the plate, the sample was allowed to stand for 20 minutes in a dark place, and the SPF was measured using an SPF analyzer (Labsphere UV-2000S). Measurements were taken at 9 points on the plate, and from the average value [ SPF _blank ] was obtained. [SPF _samples ] of each of the cosmetics of Examples and Comparative Examples were similarly measured. The rate of change in SPF with respect to the blank was determined from the following formula.
Rate of change in SPF relative to blank = [SPF _sample ]/[SPF _blank ] x 100

The rate of change in SPF with respect to the blank was evaluated according to the following criteria, and when it was 125% or more, it was determined that it was a water-in-oil sunscreen cosmetic that had an SPF improving effect.

<Evaluation criteria>
◎: Rate of change is 150% or more ○: Rate of change is 125% or more and less than the 150% point △: Rate of change is 110% or more and less than 125% ×: Rate of change is less than 110%

(2) Difficulty removing when sweating A panel of 20 women (23 to 55 years old) applied 0.1 g of the water-in-oil sunscreen cosmetics of Examples and Comparative Examples to their forearms. They were placed in a constant temperature and humidity chamber at 40°C and 70% for 30 minutes to induce sweating. After leaving the room, I wiped off my sweat with a tissue paper. The feel of the forearm after wiping was scored according to the following evaluation criteria. The total score of the 20 panelists was calculated, and if the total score was 20 points or more, it was determined that the cosmetic was a water-in-oil sunscreen that was difficult to remove with sweat.

<Evaluation criteria>
2 points: There is enough sunscreen cosmetic left.
1 point: The sunscreen cosmetic has slightly rubbed off.
0 points: Most of the sunscreen cosmetic has come off.

◎: Total score is 30 points or more ○: Total score is 20 points or more but less than 30 points
△: Total score is 10 points or more but less than 20 points ×: Total score is less than 10 points

(3) Uneven foundation application A panel of 20 women (23 to 55 years old) applied 0.1 g of the water-in-oil sunscreen cosmetics of Examples and Comparative Examples to their forearms. After drying for 3 minutes, a commercially available powder foundation was taken with a puff and spread on the forearm.The unevenness of application was scored according to the following evaluation criteria. The total score of the 20 panelists was calculated, and if the total score was 20 or more, it was judged to be a water-in-oil sunscreen cosmetic that suppresses uneven application of makeup such as foundation.
Commercially available foundation: Integrate Pro Finish Foundation (manufactured by Shiseido Co., Ltd.)

<Evaluation criteria>
2 points: No uneven coating occurs when the coating is spread.
1 point: There is slight unevenness in the coating when it is spread.
0 points: There is uneven coating when the coating is spread.

◎: Total score is 30 points or more ○: Total score is 20 points or more, but less than 30 points △: Total score is 10 points or more, but less than 20 points ×: Total score is less than 10 points

The compositions and evaluation results of Examples 1 to 11 and Comparative Examples 1 to 7 are shown in Tables 2 to 4. Note that the compositions listed in Tables 2 to 4 indicate the ratio (parts by mass) of each component when the total mass is 100 parts by mass. Further, Table 5 shows the composition of ingredients common to water-in-oil sunscreen cosmetics. Note that the compositions listed in Table 5 indicate the ratios (parts by mass) of each component when the total mass of the compositions listed in Tables 2 to 4 is 100 parts by mass.

The materials used in the water-in-oil sunscreen cosmetic are as follows.
Titanium oxide: Fine particle titanium oxide treated with fatty acid (“MT-10EX” manufactured by Teika Co., Ltd., average primary particle size 10 nm)
Zinc oxide: silicone-treated fine particle zinc oxide (“MZY-505M” manufactured by Teika Co., Ltd., average primary particle diameter 25 nm)

Regarding Examples 1 to 11, all samples had a sufficient SPF improvement effect, were difficult to remove when sweating, and were able to suppress uneven foundation application.

On the other hand, in Comparative Examples 1 to 7, sufficient effects were not obtained.

That is, in Comparative Example 1, since component (A) was not included, there was no SPF improvement effect, and the effect of suppressing the difficulty in removing the foundation when sweating and the uneven application of the foundation was insufficient. In Comparative Example 2, component (C) was not included, so the effect of suppressing the difficulty in removing the foundation when sweating and the uneven application of the foundation was insufficient. In Comparative Example 3, component (D) was not included, so the effect of suppressing uneven application of foundation was insufficient. In Comparative Example 4, since an alkylene oxide derivative different from component (A) was blended, the effect of improving SPF, making it difficult to remove when sweating, and suppressing uneven foundation application was insufficient. In Comparative Example 5, the content of component (A) was high, so the effect of suppressing uneven application of foundation was insufficient. In Comparative Example 6, the content of component (C) was high, so the effect of suppressing the difficulty in removing the foundation when sweating and the uneven application of the foundation was insufficient. In Comparative Example 7, the content of component (D) was high, so the effect of suppressing the difficulty in removing the foundation when sweating and the uneven application of the foundation was insufficient.

The oil-in-oil sunscreen cosmetic of the present invention can be applied to skin such as the face and skin, and has unique effects that cannot be obtained with conventional sunscreen cosmetics. Since it can suppress uneven application when applied, it is expected to be applied to sunscreen cosmetics and makeup bases.

Claims (1)

0.5 to 10% by mass of the following component (A), 5 to 35% by mass of component (B), 0.1 to 5% by mass of component (C), and 0.1 to 5% by mass of component (D). A water-in-oil sunscreen cosmetic containing
(A) Alkylene oxide derivative represented by the following formula (1)

(In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of added moles of the oxyalkylene group having 3 to 4 carbon atoms, and b represents an oxyalkylene group having 3 to 4 carbon atoms. Indicates the number of moles of the oxyethylene group added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a/b≦2.Formula (1 ) When the alkylene oxide derivative shown in ) has both the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group may be randomly or It is added in blocks, and if it is added in blocks, the order of arrangement does not matter.)
(B) Ultraviolet scattering agent (C) Dextrin fatty acid ester or sucrose fatty acid ester (D) Cation modified clay mineral