JP7844308B2 - sunscreen cosmetics - Google Patents

Description

This invention relates to a sunscreen cosmetic that combines a good feel, water resistance, and good dispersibility and storage stability at high temperatures.

In recent years, the importance of compositions that protect against ultraviolet (UV) radiation has increased. Protecting the skin from UV radiation is a crucial issue, and various sunscreen cosmetics have been developed. Sunscreen cosmetics protect the skin from UV radiation by blocking its penetration through the incorporation of UV absorbers and UV scatterers.

Furthermore, while the longevity of sunscreen protection is a key function, in daily life, resistance to water and sweat is also important; the higher the water resistance, the longer the sunscreen's effectiveness lasts. Therefore, instead of using emulsified cosmetics containing water-soluble components, methods are employed to create oil-based cosmetics primarily composed of non-water-soluble oil-based ingredients.

Many commonly used UV protection agents are oil-soluble UV absorbers, making them relatively easy to incorporate into oil-based cosmetics. However, oil-based cosmetics can leave a greasy or sticky feeling on the skin after application due to the oily components that remain. Therefore, methods such as reducing the amount of oily components remaining on the skin by incorporating non-aqueous volatile components, or masking the feel of the oily components by incorporating highly slippery hydrophobic spherical organic powders to create a smooth feel, can be used. However, the inclusion of non-aqueous volatile components has poor compatibility with UV absorbers, so even if they are initially dispersed, they quickly become uneven, making it difficult to maintain uniformity in the formulation after dispersion . Furthermore, the inclusion of hydrophobic spherical powders causes caking, where they settle and solidify at the bottom of the container, making redispersion difficult.

Patent Document 1 discloses a water-in-oil type sunscreen cosmetic that contains an ultraviolet absorber, an organically modified clay mineral, an oil-phase thickener, a silicone-based surfactant with an HLB of less than 8, spherical resin powder, and volatile silicone oil, so that its ultraviolet protection effect does not decrease even when it comes into contact with water or sweat. Because it is a water-in-oil type and the outer phase is not an aqueous phase, its water resistance is relatively good, but it is inferior to oil-based sunscreens. Also, the coated film swells and becomes bulkier when it comes into contact with water after drying, which is thought to increase the physical ultraviolet shielding effect, but since the swollen coated film is easily washed away by water flow, it is desirable that the state of the coated film does not change when considering water resistance intended for actual use. In addition, because it contains an organically modified clay mineral and a general oily thickener, it has low thixotropy, so when applied to the skin, it may feel sticky due to the viscosity of the oily components. Furthermore, when a water-in-oil emulsion is used as a stock solution and mixed with a propellant to create an aerosol product, a storage challenge remains: when mixed with a large amount of propellant in the aerosol container, the emulsion cannot be maintained, and the powder settles and caking occurs.

Furthermore, regarding sunscreen aerosol cosmetics that address the issue of caking, Patent Document 2 discloses a sunscreen aerosol cosmetic containing a UV protection agent, polyether-modified silicone, ethanol, hydrophobic spherical organic powder, and an oil-soluble film-forming agent; however, there is still room for improvement in terms of water resistance.

Patent Document 3 discloses a topical skin preparation that contains an oil-soluble UV absorber, an oil gelling agent, and a non-aqueous volatile component, resulting in a less oily and occlusive feel. Because it contains both an oil gelling agent and a high concentration of non-aqueous volatile components, it has low viscosity during application, allowing for good spreadability. After application, it quickly evaporates, increasing viscosity and adhesion, thus providing water resistance. However, when hydrophobic spherical organic powders or pigments are incorporated, the low viscosity of the formulation and the absence of surfactants make it difficult to maintain a mixed state, as the powders quickly settle even with stirring. Furthermore, the high concentration of non-aqueous volatile components results in a low flash point and a high hazardous material classification, limiting production locations and storage quantities.

Patent Document 4 discloses a cosmetic composition containing a polyurethane gel composition, which is an oily thickener. Cosmetics thickened with this polyurethane composition are characterized by their elasticity, light spreadability, and glossy finish, resulting in a makeup cosmetic with excellent usability. However, in sunscreen cosmetics, the appearance, color, and texture of the skin after application tend to be preferred to be natural and blend seamlessly with the skin; therefore, the shine and glossiness characteristic of oily components should be minimized. In particular, the incorporation of this polyurethane composition into oily sunscreen cosmetics may be disadvantageous due to its glossy finish. Furthermore, in the case of sunscreen cosmetics that require shaking before use, the elasticity of the formulation may lead to reduced mixability and difficulty in redispersion. Also, when producing aerosol products, the composition should be formulated with the lowest possible viscosity to ensure a uniform and fine spray. In other words, high viscosity results in a rough and uneven spray pattern, worsening usability.

Patent Document 5 discloses an oily cosmetic composition that has good stability, is non-greasy, and has a pleasant feel on the skin, achieved by combining polyurethane-79, which has good solubility, bis-ethylhexylbisoleyl pyromelitamide, and an oily component. Generally, it is known that the lower the solubility of the gelling agent in a solvent, the more hydrogen bonding is promoted between the gelling agents, resulting in a stronger gel structure. For example, dextrin palmitate, a typical oily gelling agent, tends to have a softer gel strength when combined with ester oils, which have better compatibility with hydrocarbon oils than with hydrocarbon oils. Therefore, it is assumed that polyurethane-79, whose solubility in oily solvents has been improved overall by adding a higher alcohol to its terminals, may not exhibit high gelling performance with a wide range of oils. For this reason, polyurethane-79 alone does not sufficiently exhibit effects such as improved stability over time and improved feel due to gelling, so another oily gelling agent, bis-ethylhexylbisoleyl pyromelitamide, is used in combination. In other words, polyurethane-79 was rarely used alone with the expectation of functioning as an oil gelling agent.

Thus, no sunscreen cosmetic is known that combines a good feel and water resistance with good consistency in formulation mixing, powder dispersibility, and storage stability at high temperatures.

Japanese Patent Publication No. 2017-071602 Japanese Patent Publication No. 2021-80203 Japanese Patent Publication No. 2021-123591 Japanese Patent Publication No. 2019-182835 Japanese Patent Publication No. 2021-155386

In other words, the objective is to provide a sunscreen cosmetic that combines a pleasant feel without stickiness or resistance during application with water resistance that allows the applied film to remain intact even under running water, while also improving the uniformity of the formulation's mixing and preventing caking of hydrophobic spherical powders and pigments under high-temperature conditions.

The inventors conducted diligent studies to achieve the above objective and found that components (A) to (D)
(A): Oil-soluble UV absorber (B): Polyurethane-79 gel composition (C): Non-aqueous volatile component (D): Contains hydrophobic spherical organic powder,
The above problem was solved by providing a sunscreen cosmetic characterized in that component (B) consists of (B-1) polyurethane-79 and (B-2) liquid oil.

By employing the above methods, it is possible to provide a sunscreen cosmetic with a pleasant feel during application, free from stickiness, occlusion, and oily residue, while maintaining high water resistance. Furthermore, by improving layer separation and powder sedimentation that occur when volatile components, hydrophobic spherical organic powders, and pigments with low compatibility with oily components are included, it is possible to provide a sunscreen cosmetic with good dispersibility and storage stability. As a secondary benefit, it is possible to provide a sunscreen cosmetic with a flash point of 21°C or higher.

The sunscreen cosmetic composition of the present invention can be obtained by combining specific components (A), (B), (C), and (D).

<Ingredient (A): Oil-soluble UV absorber>
The component (A) incorporated in the present invention is not particularly limited as long as it is an ultraviolet absorber that is normally incorporated into sunscreen cosmetics, but specific examples include ethylhexyl methoxycinnamate, octocrylene, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and the like.

In the present invention, if it is desired to exhibit excellent ultraviolet protection over a broad wavelength range from UVA to UVB, the component (A) to be incorporated preferably consists of at least one ultraviolet absorber having an absorption peak in the UVA region (UVA absorber) and at least one ultraviolet absorber having an absorption peak in the UVB region (UVB absorber), or at least one ultraviolet absorber having a broad absorption band spanning from UVA to UVB.

The amount of component (A) to be included varies depending on the desired UV protection effect, but for example, it is 3% by mass or more, more preferably 5 to 60% by mass, and more preferably 10 to 30% by mass, relative to the total amount of the composition. Within this range, a certain level of UV protection can be expected. When the obtained composition is used as a stock solution to make an aerosol, the above-mentioned amount should be considered as the ratio in the stock solution. The same applies to the following components.

<Component (B): Polyurethane-79 gel composition>
The component (B) polyurethane-79 gel composition of the present invention is an oil gel composition comprising (B-1) polyurethane-79 and (B-2) a liquid oil.

(B-1) Polyurethane-79 is a polyurethane copolymer having a hard segment block in which a linear aliphatic diisocyanate 1,6-hexamethylene diisocyanate (HDI) and a linear bulking diol 1,4-butanediol are bonded together to form polyurethane, and a soft segment block in which hydrogenated dilinoleyl alcohol and hydrogenated polybutanediol are bonded together. Both ends of the copolymer are blocked with stearyl alcohol. Due to the polarity of the polyurethane block, it is thought that a physical network is formed in the oil through association via hydrogen bonding between polymer-polymer and polymer-oil, and that gelation occurs when the oil is incorporated into this three-dimensional network structure.
Preferably, the (B-1) polyurethane-79 used in the present invention is in the form of a gel-like composition dissolved in (B-2) liquid oil, which facilitates uniform dissolution.

The polyurethane-79 gel composition of the present invention (B) can use commercially available OILKEMIA 5S CC (manufactured by Lubrizol). Its composition is (B-1) polyurethane-79 gel composition containing 30% polyurethane-79 and (B-2) tri(caprylic/capric acid) glyceryl as a liquid oil. When incorporated into cosmetics in Japan, it is common to list the ingredients as 70% tri(caprylic/capric acid) glyceryl, 25% hydrogenated polyolefin (C6-20), and 5% (HDI/trimethylol hexyllactone) crosspolymer.

The content of (B-1) polyurethane-79 in the polyurethane-79 gel composition of (B) is preferably 10 to 50% by mass, and more preferably 20 to 40% by mass.
The content of liquid oil (B-2) in the polyurethane-79 gel composition (B) is preferably 50 to 90% by mass, and more preferably 60 to 80% by mass.
By setting the range to this extent, uniform dissolution during manufacturing becomes easier, the blending concentration can be easily adjusted, and the effects of the invention can be significantly obtained, which is therefore preferable.

The liquid oil (B-2) used in the polyurethane-79 gel composition of (B) is not particularly limited and can be any oil commonly used in cosmetics. While its properties are not particularly limited, it is preferably a liquid oil at 25°C. Examples of liquid oils (B-2) used in the polyurethane-79 gel composition of (B) include hydrocarbon oils, ester oils, fatty acids, and silicone oils, regardless of their origin (animal oils, vegetable oils, synthetic oils, etc.). It is preferable to use one or more of these in the liquid oil (B-2).

The preferred amount of component (B) is not particularly limited, but for example, it is 0.1 to 5% by mass of the total amount of the composition, a more preferred amount is 0.3 to 3% by mass, and an even more preferred amount is 0.5 to 2% by mass.

<Components (C): Non-aqueous volatile components>
The non-aqueous volatile components used in the present invention are not particularly limited as long as they are components other than water that are commonly used in cosmetics and exhibit volatility at room temperature (25°C) and atmospheric pressure (1 atm). Specifically, examples include (C-1) volatile hydrocarbon oils, (C-2) volatile silicone oils, and (C-3) ethanol. Examples of volatile hydrocarbon oils include isododecane and hydrogenated polyisobutene. Examples of volatile silicone oils include volatile linear and branched silicone oils (volatile dimethicone) and cyclic silicone oils. Specifically, examples of linear silicone oils include low-viscosity dimethylpolysiloxane such as decamethyltetrasiloxane, branched silicone oils include methyl trimethicone and caprylyl methicone, and cyclic silicone oils include octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. In this invention, "volatile component" refers to a component that exhibits volatility at 1 atmosphere and 25°C, while "non-volatile" refers to a component that does not exhibit volatility at 1 atmosphere and 25°C, and volatile components other than water are referred to as "non-aqueous volatile components."

Among the non-aqueous volatile components mentioned above, the inclusion of component (C-1) volatile hydrocarbons improves skin compatibility, while the inclusion of component (C-2) volatile silicone oil tends to reduce stickiness. Furthermore, the inclusion of component (C-3) ethanol significantly reduces the oily feeling.
Component (C) may be formulated alone or in combination of two or more types. For example, this includes cases where component (C) is only component (C-1) and components (C-2) and (C-3) are not included.

The amount of component (C) is not particularly limited, but a preferred amount is 5 to 60% by mass of the total composition, a more preferred amount is 15 to 55% by mass, and an even more preferred amount is 30 to 50% by mass. Within this range, a sunscreen cosmetic can be obtained that has a light spreadability, a reduced oily film feeling, and is fast-drying and easy to use.
Furthermore, if the amount of component (C-3) is less than 10% by mass of the total composition, the flash point will not fall below 21°C, which is preferable from the standpoint of reducing restrictions on the manufacturing location of hazardous materials and increasing the amount that can be stored. This also includes the case where component (C-3) is not included.

<Component (D): Hydrophobic spherical organic powder>
The component (D) incorporated in the present invention is not particularly limited as long as it is commonly used in cosmetics. Specifically, examples include silicone-based spherical powders such as (vinyl dimethicone/methicone silsesquioxane) crosspolymer, (diphenyl dimethicone/vinyl diphenyl dimethicone/silsesquioxane) crosspolymer, and (dimethicone/vinyl dimethicone) crosspolymer; acrylic acid-based crosslinked polymers such as methyl methacrylate crosspolymer and (acrylates/ethylhexyl acrylate) crosspolymer; and polyamide-based powders such as nylon-12 and nylon-6. Preferred commercially available products include KSP-100, 105, 300 (manufactured by Shin-Etsu Chemical Co., Ltd.), DOWSIL TREFIL E-506S (manufactured by Toray Dow Corning), Techpolymer MBP-8HP, Techpolymer ACX-1502C (manufactured by Sekisui Chemical Co., Ltd.), ORGASOL 2002 EXD NAT COS, ORGASOL 1002 D NAT COS (manufactured by Arkema). These can be used individually or in combination.

The amount of component (D) is not particularly limited, but for example, a preferred amount is 0.1 to 20% by mass, a more preferred amount is 2 to 15% by mass, and an even more preferred amount is 3 to 10% by mass, relative to the total amount of the composition. Within this range, the composition is less likely to leave a white residue after application and maintains a good feel for an extended period.

In this invention, the inclusion of water itself, water-containing plant extracts, water-containing raw materials, etc., is permitted as long as it does not impede the invention. In other words, while this invention does not inherently require the inclusion of water, it is acceptable to include water for purposes such as incorporating humectants like plant extracts. Therefore, it is not a necessary condition to use a so-called non-aqueous system.

On the other hand, if the moisture content is too high, uniformity decreases and layer separation becomes more likely. Furthermore, when powders such as UV scattering agents are incorporated, problems such as caking and inability to redisperse may occur. The moisture content that maintains uniformity and redispersibility varies depending on the formulation, but for example, maintaining a moisture content of 3.0% by mass or less can keep the mixture in good condition.

In this invention, in addition to the essential components, oils other than components (A) and (B-2) may be included, as long as they do not impair the effects of the present invention. For example, oils such as vegetable oils, ester oils, hydrocarbon oils, and silicone oils may be included. Specific examples include animal and vegetable oils such as avocado oil, macadamia nut oil, olive oil, beeswax, and candelilla wax; ester compounds such as isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, isostearyl myristate, cetyl 2-ethylhexanoate, octyldodecyl myristate, and glyceryl tristearate; hydrocarbon oils such as squalane, liquid paraffin, isododecane, hydrogenated polyisobutene, paraffin, white petrolatum, and ceresin; and silicone compounds such as dimethicone, cyclopentasiloxane, caprylyl methicone, and diphenylsiloxyphenyl trimethicone.

The sunscreen cosmetic of the present invention may also contain, as needed, ingredients commonly used in cosmetics, such as whitening agents, moisturizers, thickeners, antioxidants, metal ion chelating agents, surfactants, polyhydric alcohols, UV scattering agents, powders, pearls, colorants, and fragrances, within qualitative and quantitative limits that do not impair the effects of the present invention.

The form of the sunscreen cosmetic of the present invention is not particularly limited and may be, for example , a lotion, a spray (aerosol type, non-aerosol type), etc.
Among the above, the form of the sunscreen cosmetic of the present invention is preferably a spray, and more preferably an aerosol spray type sunscreen cosmetic, from the viewpoint of ultraviolet protection effect and ease of use. The aerosol container is filled with the cosmetic of the present invention as a concentrate, along with a propellant. The mass ratio of the concentrate to the propellant (concentrate/propellant) is preferably 40/60 to 10/90, and more preferably 25/75 to 15/85. Within this range, sufficient spraying force can be obtained, and the product can be sprayed uniformly.

The propellant used in the present invention is not particularly limited, as long as it is a propellant that can be used in aerosol products in general. For example, various liquefied petroleum gases (LPG), dimethyl ether, mixtures of liquefied petroleum gas and dimethyl ether, and compressed gases such as nitrogen gas and carbon dioxide can be used. LPG is a liquefied petroleum gas whose main components are propane, butane, and isobutane.
Furthermore, the cosmetic composition of the present invention can be applied not only to sunscreen cosmetics, but also to makeup cosmetics such as foundations and makeup bases that have been given sunscreen effects.

The present invention will be further described below with reference to examples, but these examples are not intended to limit the invention in any way. Unless otherwise specified, the amounts of each ingredient are expressed in mass percent.

Each component except the non-aqueous volatile component and powder listed in Tables 1 and 2 below was heated and dissolved. The powder was then added, followed by general stirring using a disperser or homomixer. After cooling, the mixture was cooled, and the non-aqueous volatile component was added to obtain the stock solution. Evaluation items 1 and 5 were evaluated for each of the obtained stock solutions. For evaluation items 2-4, 6 g of the stock solution and 24 g of LPG (gas pressure: 0.15 MPa) as a propellant were filled into a 100 mL aerosol test bottle (Tokyo Polymer Co., Ltd.: transparent glass test bottle with a flexible PVC coating) to create a test sample (bulk:propellant = 1:4).

Evaluation Item 1: <Evaluation of Water Resistance>
Each cosmetic composition was dropped at a rate of 2 mg/cm² onto a designated PMMA plate (polymethyl methacrylate) HELIOPLATE HD6 (5 × 5 cm, surface roughness ⁶ μm, manufactured by HELIOSCREEN), applied with a finger for 60 seconds, dried for 15 minutes, and then measured using an SPF analyzer (LABSPHERE UV TRANSMITTANCE ANALYZER/UV-1000S). Next, the PMMA plates (coated with each composition) were exposed to running water for 40 minutes, thoroughly dried, and the SPF value was measured again. The percentage of the SPF value after the water resistance test relative to the SPF value before the water resistance test was calculated and defined as the residual rate (%) (see Formula 1 below).
In this invention, it was determined that sufficient UV protection was maintained when the SPF value change suppression rate exceeded 95%.

Evaluation Item 2: <Evaluation of Separation Speed>
Each aerosol test bottle containing a test sample was vigorously shaken up and down to ensure the contents were uniform. After confirming this, the time it took for a clear layer to appear on top of the sample was measured.
◎: No transparent layer appears on top for more than 1 minute.
○: Separation begins after 30 seconds to 1 minute, and a transparent layer appears on top.
△: Separation begins after 10 to 30 seconds, and a transparent layer appears on top.
×: Separation begins within 10 seconds, and a transparent layer appears on top.

Evaluation Item 3: <Evaluation of caking (evaluation of redispersibility under high-temperature storage)>
(Caking: A condition in which the settled lower layer has poor dispersion, adhering to the bottom and not dispersing uniformly.)
The aerosol test bottles containing the test samples prepared for the separation rate evaluation were left to stand at 40°C for one month, and their dispersibility was evaluated when they were inverted and mixed.
◎: The powder at the bottom will be gone within 10 uses.
○: The powder at the bottom will disappear after 10 to 20 uses.
△: The powder at the bottom disappears after 20 to 50 uses.
×: Even after turning it over 50 times, the powder that had aggregated at the bottom did not disappear.

Evaluation Item 4: Sensory Evaluation (Lack of Stickiness)
A panel of 10 experts used the following evaluation criteria to make their decision.
◎: Nine or more people responded that it was not sticky.
○: 6 to 8 people answered that it was not sticky.
△: 3 to 5 people answered that it was not sticky.
×: Two or fewer people answered that it was not sticky.

Evaluation Item 5: <Evaluation of Flash Point>
The flash point was measured using a TAG sealed flash point analyzer from 25°C to 80°C. Furthermore, for the undiluted liquid that did not ignite in the sealed analyzer, the flash point was measured using a Cleveland open flash point analyzer until the liquid boiled.

Evaluation Item 5: Overall Evaluation
The evaluation of the above evaluation items 1 through 5 was comprehensively assessed and used to make a decision.
+++: Three or more ◎s, no △ or lower ratings in evaluation items 1-4.
++: Two ◎ marks, no ratings below △ in evaluation items 1-4.
+: One ◎, no ratings below △ in evaluation items 1-4.
-: No ◎ marks or evaluations of △ or lower in evaluation items 1-4.

Tables 1 and 2 show the formulations for Examples 1 to 7 and Comparative Examples 1 to 6, and summarize the results for each evaluation item.
Comparative Example 1, which contains an oil-soluble UV absorber as component (A) and does not contain component (B) polyurethane-79 gel composition, incorporates component (D), a highly slippery hydrophobic spherical organic powder. Although it has a smooth, non-sticky feel, the powder dispersibility is poor, causing it to separate immediately after stirring, making it difficult to maintain formulation uniformity. Furthermore, caking was observed during high-temperature storage, making it difficult to maintain the designed quality when considering storage during the summer months when sunscreen is used.
Therefore, in Examples 1 to 3, which incorporated component (B) polyurethane-79 gel composition, the separation rate after stirring was slowed, which maintained the uniformity of the formulation during use. Furthermore, the powder dispersibility improved, preventing caking, and the coating film became stronger after drying, resulting in improved water resistance.
On the other hand, in Comparative Examples 2 to 4, in which component (B') was incorporated as an oil gelling agent commonly used for thickening oils, although its thickening mechanism differs from that of component (B) polyurethane-79 gel composition, sufficient improvement in the separation rate after stirring was not observed, and caking also occurred. Furthermore, in Comparative Example 4, the dibutyl lauroyl glutamide, which is component (B'), had aggregated, which was undesirable from a product quality standpoint.
In Examples 4 and 5, component (C), a non-aqueous volatile component, is present in high concentrations. This results in a low flash point and a high hazardous material classification, which poses a problem in terms of production locations and storage quantities. Furthermore, it must be considered that high concentrations of non-aqueous volatile components can be irritating. However, the product exhibits excellent usability and stability, posing no problems in terms of product use.
Comparative Example 5, lacking component (D), which is a hydrophobic spherical powder, did not exhibit caking, but it felt sticky due to the oily component, and its water resistance was also poor. Comparative Example 6, in which component (B) polyurethane-79 gel composition was replaced with dextrin palmitate in Comparative Example 5, still exhibited stickiness due to the oily component, and in fact, the stickiness of the dextrin palmitate became noticeable, and the separation speed also increased.
In Example 6, although the amount of component (D), which is a hydrophobic spherical powder, is small, it is possible to mask the stickiness caused by the oily component. Furthermore, even in Example 7, where the amount of component (D) is large, caking is prevented, demonstrating that it is possible to achieve both a good feel and stability.

Although not shown in the evaluation results in Table 1, these examples did not exhibit powder caking even in their undiluted form, and their stability was good even when stored at high temperatures.

The compositions for each formulation were prepared using conventional methods. It was confirmed that all formulations exhibited the effects of the present invention.

<Chemical-type sunscreen cosmetics>
1. Ethylhexyl Methoxycinnamate 9.0% by mass
2. Bis-ethylhexyloxyphenol methoxyphenyl triazine 1.5% by mass
3. Diethylamino hydroxybenzoyl hexyl benzoate 1.0% by mass
4. Octocrylene 1.0% by mass
5. Ethylhexyltriazone 0.5% by mass
6. Polyurethane-79 gel composition*1 1.0% by mass
7. (VP/Eicosene) Copolymer 1.0% by mass
8. Isododecane 35% by mass
9. Ethanol 5.0% by mass
10. Cyclopentasiloxane 5.0% by mass
11. (Vinyl dimethicone/methicone silsesquioxane) crosspolymer 9.0% by mass
12. Dimethylsilylated silica*3 1.0% by mass
13. Neopentyl glycol diethylhexanoate. Remainder: 14. PEG/PPG-19/19 dimethicone/cyclopentasiloxane mixture*2 1.0% by mass
15. Silicon-treated zinc oxide dispersion of fine particles 5.0% by mass
16. SA/NAI treated pigment-grade titanium dioxide dispersion*3 2.5% by mass
17. Ultramarine 0.5% by mass
18. Polyglyceryl-2 Triisostearate 1.0% by mass
19. Fragrance trace amount total 100.0% by mass

*1: OILKEMIA 5S CC Polymer (manufactured by Lubrizol)
*2: DOWSIL BY 11-030 (manufactured by Toray Dow Corning)
*3: SA/NAI-TR-10/D5 (80%) MiBrid Color Dispersion (manufactured by Miyoshi Chemical Co., Ltd.)

The resulting chemical-type sunscreen cosmetic was satisfactory in all respects, possessing both a good feel and water resistance, while also exhibiting excellent stability in terms of maintaining uniform mixing of the formulation and preventing caking of powders and pigments.

<Sunscreen cosmetics containing both UV absorbers and UV scatterers>
1. Ethylhexyl Methoxycinnamate 6.0% by mass
2. Diethylamino hydroxybenzoyl hexyl benzoate 1.0% by mass
3. Dimethicone diethyl benzalmalonate 2.0% by mass
4. Polyurethane-79 gel composition*1 1.5% by mass
5. Isododecane 15.0% by mass
6. Cyclopentasiloxane 15.0% by mass
7. Methyltrimethicone 5.0% by mass
8. Ethanol 10.0% by mass
9. Nylon 12 spherical powder (average particle size 10 μm) 8.0% by mass
10. Polymethylsilsesquioxane 1.0% by mass
11. Isononyl isononanoate Remainder 12. PEG/PPG-19/19 dimethicone/cyclopentasiloxane mixture*2 3.0% by mass
13. Isostearic acid-treated fine particle zinc oxide dispersion*3 5.0% by mass
Total 100.0% by mass

*1: OILKEMIA 5S CC POLLYMER (manufactured by Lubrizol)
*2: DOWSIL BY 11-030 (manufactured by Toray Dow Corning)
*3: FLZ-10 (manufactured by Teika Co., Ltd.)

The resulting sunscreen cosmetic formulation, combining UV absorbers and UV scatterers, offered excellent usability and water resistance, while also exhibiting superior stability in terms of maintaining uniform mixing consistency and preventing powder caking. Overall, it was satisfactory in all respects.

<Cyclic silicone-free sunscreen cosmetic>
1. Ethylhexyl Methoxycinnamate 10.0% by mass
2. Octocrylene 3.0% by mass
3. t-Butyl methoxydibenzoylmethane 1.0% by mass
4. Ethylhexyltriazone 1.0% by mass
5. Neopentyl glycol diethylhexanoate 30.0% by mass
6. Polyurethane-79 gel composition*1 2.0% by mass
7. Isododecane Residue
8. Ethanol 15.0% by mass
9. Polymethyl methacrylate crosspolymer spherical porous powder (average particle size 6 μm) 15.0% by mass
10. PEG/PPG-19/19 Dimethicone/Hydrogenated Polyisobutene Mixture*2 4.0% by mass
11. Roman chamomile flower oil (trace amount)
12. Lavender flower oil (trace amount)
Total 100.0% by mass

*1: OILKEMIA 5S CC Polymer (manufactured by Lubrizol)
*2: DOWSIL BY 25-337 (manufactured by Toray Dow Corning Co., Ltd.)

The resulting cyclic silicone-free sunscreen cosmetic was satisfactory in all respects, possessing both a good feel and water resistance, while also exhibiting excellent stability in terms of maintaining uniform mixing of the formulation and preventing powder caking.

Claims (4)

The following ingredients,
(A): Oil-soluble UV absorber (B): Polyurethane-79 gel composition (C): Non-aqueous volatile component (D): Contains hydrophobic spherical organic powder,
The component (B) is characterized by consisting of (B-1) polyurethane-79 and (B-2) liquid oil.
Liquid sunscreen cosmetic. The liquid sunscreen cosmetic composition according to claim 1, wherein the content of ethanol in component (C) relative to the total amount of the composition is less than 10% by mass. The following ingredients,
(A): Oil-soluble UV absorber
(B): Polyurethane-79 gel composition
(C): Non-aqueous volatile components
(D): Hydrophobic spherical organic powder
It contains,
Component (B)
A sunscreen cosmetic characterized by comprising (B-1) polyurethane-79 and (B-2) liquid oil , which is an aerosol spray type or a non-aerosol spray type. A liquid sunscreen cosmetic composition according to claim 1 or claim 2, wherein the flash point is 21°C or higher.