Stick-type cosmetics

Abstract

To provide a stick-like cosmetic having high ultraviolet protection effect, good stability and moldability and excellent usability.SOLUTION: There is provided a stick-like cosmetic having the following main constitution: (1) a stick-like cosmetic containing the followings (A), (B) and (C); (A) a silicone resin wax, (B) a volatile silicone oil and (C) an ultraviolet shielding agent, (2) a stick-like cosmetic described in (1) in which the silicone resin wax (A) is an alkyl-modified silsesquioxane wax, (3) a stick-like cosmetic described in (1) to (2) in which the content of the silicone resin wax (A) is 5 mass% or more and 25 mass% or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a stick-type cosmetic preparation. [Background technology]

[0002] Stick-type cosmetics are composed of oily components including wax and liquid oil, and powders such as pigments as the backbone, and are used in a variety of applications due to their ease of use and portability. They are also widely used as sunscreens, and stick-type cosmetics containing ultraviolet screening agents have been disclosed (Patent Document 1).

[0003] Various efforts have been made to solve the problems associated with the ease of use and moldability of stick-type cosmetics. For example, a lipstick formulation has been disclosed that incorporates a volatile silicone oil and other liquid oils as oily components and multiple waxes including a silsesquioxane resin wax (Patent Document 2).

[0004] However, stick-type cosmetics tend to have a heavy feel due to their oily ingredients due to their composition. This tendency is particularly pronounced and poses a major problem when a high amount of UV absorbers is blended as a UV screening agent to impart a high UV protection effect. Furthermore, blending a high amount of UV scattering agents as a UV screening agent also poses problems such as making the skin appear whitish (white cast), reducing slipperiness, and even reducing the strength of the stick.

[0005] In other words, no technology is known yet that provides a sunscreen stick with high UV protection effect and satisfies the quality requirements, and further improvements are needed. The technology described in Patent Document 2 prevents color transfer by incorporating a small amount of silsesquioxane resin wax, which is compatible with volatile silicone oil, and is essentially different from the present invention, which is a sunscreen stick solidified with silsesquioxane resin wax. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-129281 [Patent Document 2] Special Publication No. 2007-532754 Summary of the Invention [Problem to be solved by the invention]

[0007] To provide a stick-type cosmetic preparation having a high ultraviolet protection effect, good stability and moldability, and excellent usability. [Means for solving the problem]

[0008] The present invention is an invention that, by selecting a specific wax, solidifying an ultraviolet blocking agent and a volatile silicone oil, and molding the solidified mixture into a stick, it is possible to obtain a stick-type cosmetic product that is excellent in usability and combines the stability and moldability of a stick with a high ultraviolet protection effect.

[0009] The main configuration of the present invention is as follows. (1) A stick-type cosmetic preparation containing (A), (B), and (C). (A) Silicone resin wax (B) Volatile silicone oil (C) UV screening agent (2) A stick-type cosmetic preparation according to (1), wherein (A) the silicone resin wax is an alkyl-modified silsesquioxane wax. (3) A stick-type cosmetic preparation according to (1) or (2), in which the content of (A) the silicone resin wax is 5% by mass or more and 25% by mass or less. [Effects of the Invention]

[0010] The stick-type cosmetic composition of the present invention has a high ultraviolet protection effect, is excellent in stability and moldability, and is also excellent in usability. DETAILED DESCRIPTION OF THE INVENTION

[0011] The components of the present invention will be described below.

[0012] (A) Silicone resin wax Component (A) silicone resin wax is a compound represented by the general formula R n SiO (4-n) / 2 (wherein R is an alkyl group having 1 to 8 carbon atoms, an aryl group, a carbinol group, or an amino group, and n is generally less than 1.8) is modified with an alkyl group, and is an alkyl-modified silicone wax that solidifies at 25°C. In particular, the general formula RSiO 3 / 2 The silsesquioxane resin (wherein R is an alkyl group, an aryl group, a carbinol group, or an amino group having 1 to 8 carbon atoms) is modified with an alkyl group and solidified at 25°C, and has the general formula (R'R"SiO 1 / 2 )x(RSiO 3 / 2 )y (wherein x and y have values ​​of 0.05 to 0.95, R and R' are each independently an alkyl group having 1 to 8 carbon atoms, an aryl group, a carbinol group, or an amino group, and R" is an alkyl group having 20 to 55 carbon atoms) is preferred. An example of a commercially available product is alkyl (C30-45) dimethylsilyl polypropylsilsesquioxane (SW-8500 C30 Resin Wax, manufactured by Dow Corning Toray Co., Ltd.).

[0013] Component (A) may be used alone as a solidifying agent or may be mixed with other waxes. From the viewpoints of moldability and usability, the blending amount of component (A) is preferably from 5 to 25% by mass, and more preferably from 10 to 20% by mass, of the total amount of the stick-type cosmetic preparation. When used in combination with other waxes, the blending amount of component (A) is preferably at least 30% by mass, more preferably 50% by mass, of the total amount of waxes, and in this case, the total amount of waxes is preferably 5% to 25% by mass, more preferably 10% to 20% by mass, of the total amount of the stick-type cosmetic.

[0014] (B) Volatile silicone oil In the volatile silicone oil of component (B), "volatile" means that it has a flash point of 35 to 87°C. Volatile silicone oils that can be used in the present invention include cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, cyclopentasiloxane (decamethylcyclopentasiloxane), and dodecamethylcyclohexasiloxane, as well as methyltrimethicone, with cyclopentasiloxane being particularly preferred. From the viewpoint of usability, the blending amount of component (B) is preferably 40% by mass or more and 70% by mass or less, and more preferably 45% by mass or more and 65% by mass or less, based on the total amount of the stick-type cosmetic.

[0015] (C) UV screening agent The ultraviolet shielding agent of component (C) is at least one selected from ultraviolet absorbers and ultraviolet scattering agents, and a wide range of agents commonly used in sunscreen cosmetics can be used. The ultraviolet absorber or ultraviolet scattering agent may be used alone, or a combination of an ultraviolet absorber and an ultraviolet scattering agent may be used.

[0016] The ultraviolet absorber used in the present invention is not particularly limited, but examples thereof include organic ultraviolet absorbers such as ethylhexyl methoxycinnamate, octocrylene, dimethicodiethyl benzalmalonate, polysilicon-15, t-butylmethoxydibenzoylmethane, ethylhexyl triazone, diethylaminohydroxybenzoylhexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and ethylhexyl salicylate.

[0017] The UV scattering agent used in the present invention is not particularly limited, but examples thereof include fine particle metal oxides having an average particle size of 0.1 μm or less, such as titanium oxide and zinc oxide, which are capable of scattering UV rays. UV scattering agents are relatively safe because they shield UV rays from the skin surface. UV scattering agents may be hydrophobized, and examples of the hydrophobizing agent include fatty acids, higher alcohols, hydrocarbons, oils and fats, esters, silicone oils, siloxane resins, fluorine compounds, and acyl amino acids.

[0018] The blending amount of (C) ultraviolet screening agent is preferably 5% by mass or more and 45% by mass or less, more preferably 10% by mass or more and 40% by mass or less, and particularly preferably 10% by mass or more and 35% by mass or less, based on the total amount of the stick-type cosmetic. The blending amount can be increased or decreased as appropriate depending on the target SPF value. However, from the viewpoint of usability, the content of the ultraviolet absorber in the stick-type cosmetic is preferably 0% by mass or more and 20% by mass or less, and more preferably 0% by mass or more and 10% by mass or less.

[0019] The stick-form cosmetic preparation of the present invention may contain other ingredients as long as they do not affect the effects of the present invention, such as fatty acids, higher alcohols, hydrocarbons, oils and fats, esters, silicone oil, water, polyhydric alcohols, sugars, sugar alcohols, humectants, surfactants, water-soluble polymers, plant extracts, vitamins, pigments, siloxane resin powder, antioxidants, antibacterial and preservatives, physiologically active ingredients, salts, chelating agents, neutralizing agents, pH adjusters, fragrances, etc. However, from the viewpoint of usability, the amount of non-volatile components that are liquid to paste-like at 25°C, such as fatty acids, higher alcohols, hydrocarbons, oils and fats, esters, and silicone oils, is preferably 0% by mass or more and 20% by mass or less, and more preferably 0% by mass or more and 10% by mass or less, of the total amount of the stick-type cosmetic. [Example]

[0020] The stick-type cosmetic preparation of the present invention will be specifically described below. Stick-type cosmetic preparations of Examples 1 to 5 and Comparative Examples 1 to 8 were prepared. All ingredients were mixed, then heated and stirred to a temperature at which the waxes melted, forming a single liquid phase. The mixture was then poured into a glass container or stick container and allowed to solidify at room temperature. The compositions and evaluation results of the prepared cosmetics are shown in Tables 1 and 2, and the raw materials of the waxes used are shown in Table 3. The compositions are in mass%. The SPF, hardness, high-temperature stability, moldability into sticks, and usability were evaluated.

[0021] <spf> The prepared cosmetic was applied to a PMMA plate (manufactured by HelioScreen Laboratoire) at a concentration of 1.3 mg / cm. 2 The SPF was measured using an SPF analyzer (manufactured by Labsphere, model UV-2000S). The higher the SPF number, the greater the UV blocking effect.

[0022] <Hardness> Using a FUDOH rheometer (Rheotech, model RT-2002J), the prepared cosmetic was filled into a glass container with a diameter of 3 cm, and measurements were taken under the conditions of a pressure-sensitive shaft of 3Φ, a penetration speed of 6 cm / min, and a penetration depth of 10 mm. If the cosmetic had not solidified to the inside, this was recorded as "-".

[0023] (UV protection effect) The UV protection effect was evaluated according to the following criteria. 〇: SPF 15 or higher ×: Less than SPF 15

[0024] (Moldability: Strength) The strength of the stick-type cosmetic preparations was evaluated according to the following criteria, taking into consideration whether they could be molded into a stick shape and whether they would break during use. ◎:Hardness 200g or more 〇: Hardness 150g or more and less than 200g △: Hardness 110g or more and less than 150g ×: Hardness less than 110g

[0025] (Moldability: Release moldability) The release properties of stick-type cosmetics were evaluated by filling the cosmetic directly into the bottom of the dispenser and molding it into a stick. The temporary lid was then removed and the entire stick was dispensed, and the evaluation was visually evaluated according to the following criteria. If the release properties were poor, chips or scratches would appear on the top or sides of the stick when the temporary lid was removed or the stick was dispensed. Good: No chips or scratches on the top or sides. △: Slight chips or scratches on the top and sides. ×: Chipping and scratches occur over the entire top and sides.

[0026] (high temperature stability) The cosmetic was filled into a glass container with a diameter of 3 cm and stored at 50°C for one month. The change in appearance after storage was visually observed and evaluated according to the following criteria. Good: No oil separation or sweating is observed. ×: Separation of oil and sweating were observed.

[0027] (Usability) The stick-type cosmetic was directly applied to the forearm and evaluated for ease of spread during application and stickiness after application. If the cosmetic broke during use and usability could not be evaluated, a "-" was recorded. 〇: Spreads easily and is not sticky. △: Does not spread well or feels sticky. ×: Poor spreadability and sticky.

[0028] (result) As shown in the lower part of Table 1, it was confirmed that the stick-type cosmetics using the silicone resin waxes of Examples 1 to 5 have a high UV protection effect, good stability and moldability, and are cosmetics with excellent usability. On the other hand, as shown in the lower part of Table 2, in the comparative examples not incorporating the configuration of the present invention, one or more of the items were defective, and cosmetics of the desired quality were not obtained. In comparative examples 1 and 2, silicone waxes other than silicone resin wax were used, and no hardness was obtained at all. In comparative examples 3 to 8, waxes commonly used in stick-type cosmetics were used, but in comparative examples 3, 6, and 7, no hardness was obtained and they could not be molded into a stick shape. In comparative examples 4 and 5, a certain degree of hardness was obtained, but release from the stick container was poor, resulting in chipping during molding. Usability was also poor. In comparative example 8, hardness was obtained well, but the melting point was high, and aggregation of the UV scattering agent was observed at the high temperature during preparation, confirming that sufficient UV protection effect was not obtained.

[0029] [Table 1]

[0030] [Table 2]

[0031] [Table 3]

[0032] Further formulation examples are given below. Example 6: Tone-up sun care stick 1. Alkyl (C30-45) dimethylsilyl polypropylsilsesquioxane 10% 2. Paraffin, microcrystalline wax 5% 3. Cyclopentasiloxane residue 4. Methyl trimethicone 3% 5. Ethylhexyl methoxycinnamate 5% 6. Fine particle titanium dioxide 2% 7. Fine particle zinc oxide 20% 9. PEG-9 Polydimethylsiloxyethyl Dimethicone 2% 10. (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 2% 11. Gunjo 0.03% 12. Iron oxide 0.02%< / spf>

Claims

1. A stick-type cosmetic preparation comprising the following components (A), (B), and (C): (A) Alkyl (C30-45) dimethylsilyl polypropyl silsesquioxane 5% by mass or more and 25% by mass or less (B) Volatile silicone oil (C) UV blocking agent

2. A stick-type cosmetic product according to claim 1, which is a sunscreen stick.

3. A stick-type cosmetic preparation according to claims 1 to 2, characterized in that it contains an ultraviolet scattering agent as component (C).

Images