Cosmetics

Abstract

The objective is to provide a cosmetic product that contains a high amount of niacinamide, is non-sticky, suppresses the squeaky feeling felt when blending into the skin after application, and has excellent moisturizing properties. [Solution] A cosmetic composition containing (A) niacinamide 3% by mass or more and (B) glycereth-12.

Description

Technical Field

[0001] The present invention relates to a cosmetic containing a high content of niacinamide.

Background Art

[0002] Niacinamide is an amide compound of nicotinic acid, also known as nicotinamide / niacin / vitamin B3. Niacinamide is a water-soluble vitamin and one of the vitamin B group. A deficiency of niacinamide causes deficiency diseases such as pellagra. Niacinamide is used as a component of topical medications for the treatment of acne vulgaris and is also formulated in cosmetics for cosmetic purposes. In Japan, it has been approved as an active ingredient for improving wrinkles (wrinkle niacin) and whitening effect (nicotinic acid amide) in quasi-drugs cosmetics.

[0003] Niacinamide has often been formulated in skincare cosmetics and the like as an active ingredient for improving wrinkles as described above. To improve wrinkles and impart firmness and elasticity to the skin, a high formulation of about 3 to 7% by mass is required. However, it is known that when the content of niacinamide is high, the usability decreases, and empirically, a decrease in usability is recognized when the content is 3% by mass or more. For example, stickiness felt during application and a rough feeling felt when the skin becomes accustomed after application are typical. Generally, in order to improve the usability such as stickiness and roughness of such cosmetics, attempts have been made to improve by combining components such as various oils, thickeners, moisturizers, and surfactants. However, it has been pointed out that even if a cosmetic containing a high content of niacinamide temporarily improves the usability by containing such components, after a certain period of time has passed after application, an unfavorable usability such as roughness is significantly felt again. Under such circumstances, a technology for cosmetics containing a high content of niacinamide has been disclosed.

[0004] For example, Patent Document 1 describes a cosmetic product containing niacinamide and propylene glycol or polypropylene glycol, which is non-greasy, has an oil-like texture that blends well with the skin, and provides excellent results such as firmness.

[0005] Furthermore, Patent Document 2 describes a cosmetic composition that contains a high amount of niacinamide, as well as water-soluble polysaccharides and amphiphilic compounds. The poor viscosity stability of the composition due to niacinamide has been improved. However, while conventional technologies have improved stickiness to some extent, they cannot be said to have improved the squeaky feeling. There is a need for cosmetics with a high niacinamide content that are free from stickiness and squeaky feeling, and offer an excellent user experience. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-131553 [Patent Document 2] Japanese Patent Publication No. 2020-128363 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention aims to provide a cosmetic composition that contains a high amount of niacinamide, is non-sticky, suppresses the squeaky feeling felt when blended into the skin after application, and has excellent moisturizing properties. [Means for solving the problem]

[0008] The present invention has the following configuration. (1) A cosmetic composition containing the following (A) and (B). (A) Niacinamide 3% by mass or more (B) Polyoxyethylene glycerin in which the average number of moles of ethylene oxide added to polyoxyethylene glycerin is 10 to 30. (2)(B) The cosmetic composition according to (1), wherein the average number of moles of ethylene oxide added to polyoxyethylene glycerin is 12 to 26. (3)(B) The cosmetic composition according to (1) or (2), wherein the polyoxyethylene glycerin comprises one or more selected from glycereth-12, glycereth-18, glycereth-20, and glycereth-26. (4) A cosmetic composition according to any of (1) to (3) further comprising (C) diglycerin and / or betaine. [Effects of the Invention]

[0009] The present invention provides a cosmetic composition that contains a high amount of niacinamide, is non-sticky and non-greasy, and has excellent moisturizing properties. [Modes for carrying out the invention]

[0010] In this specification, "stickiness" refers to a sensory evaluation of a condition in which a person feels an unpleasant, sticky sensation when applying cosmetics to their skin. Furthermore, in this specification, "squeaky feeling" refers to a sensory evaluation of a condition in which, when fingers are slid across the skin, a strong frictional sensation is felt between the skin surface and the fingers, resulting in a non-smooth feel.

[0011] The present invention relates to a cosmetic composition containing (A) niacinamide in an amount of 3% by mass or more, and (B) polyoxyethylene glycerin having an average number of moles of ethylene oxide added to polyoxyethylene glycerin of 10 to 30.

[0012] The ingredients contained in the cosmetic composition of the present invention will be described below. <(A) Ingredient: Niacinamide> The component (A) of this invention, niacinamide, is a nicotinic acid amide compound, also known as nicotinamide (vitamin B3 / niacin), and is a water-soluble vitamin. Niacinamide may be an extract from a natural product or synthesized by a known method. Specifically, those listed in the Japanese Pharmacopoeia can be used. In addition to its wrinkle-improving effect, niacinamide is known to promote blood circulation, improve rough skin, inhibit melanin production, and have a whitening effect.

[0013] In the cosmetic composition of the present invention, the content of component (A) is 3% by mass or more. The cosmetic composition of the present invention can be a wrinkle-improving cosmetic composition depending on the purpose. In order to obtain a wrinkle-improving effect on the skin at a level close to that of a quasi-drug, the content of component (A) is 3% by mass or more, preferably 3 to 10% by mass, more preferably 3 to 7% by mass, and particularly preferably 5 to 7% by mass, based on the total amount of the cosmetic composition.

[0014] <(B) Component: Polyoxyethylene glycerin in which the average number of moles of ethylene oxide added to polyoxyethylene glycerin is 10 to 30> Polyoxyethylene glycerin, which is component (B) in the cosmetic composition of the present invention, is an ether of glycerin and polyethylene glycol. The compound can be used in the present invention if the number of ethylene oxide molecules attached to polyoxyethylene glycerin is 10 to 30, preferably 12 to 26, per molecule of the compound. Specific examples of such compounds include glycereth-26 (average number of attached ethylene oxide molecules: 26), glycereth-20 (average number of attached ethylene oxide molecules: 20), glycereth-18 (average number of attached ethylene oxide molecules: 18), and glycereth-12 (average number of attached ethylene oxide molecules: 12). Glycereth-26 or glycereth-12 are particularly preferred. Glycereth-26, glycereth-20, glycereth-18, and glycereth-12 are commercially available as texture enhancers in water-based basic cosmetics such as lotions, essences, and toners, and can be used in these products. In the cosmetic of the present invention, the content of component (B) can be appropriately set according to the balance with other contained components. Component (B) eliminates the stickiness during the application of the cosmetic of the present invention containing high-concentration niacinamide of 3% by mass or more, and further eliminates the tightness after application. The content of component (B) is preferably 0.5 to 15% by mass, more preferably 1 to 10% by mass, and particularly preferably 1 to 5% by mass based on the total amount of the cosmetic.

[0015] <Component (C) Diglycerin and / or Betaine> The cosmetic of the present invention preferably further contains diglycerin and / or betaine as component (C). (C) By further containing diglycerin and / or betaine together with (B), the stickiness during the application and the tightness after application of the cosmetic of the present invention can be more effectively eliminated. In the cosmetic of the present invention, component (C) is preferably contained because, when combined with component (B), it further eliminates the stickiness during the application of the cosmetic of the present invention derived from high-concentration niacinamide of 3% by mass or more, and further eliminates the tightness after application.

[0016] In the cosmetic of the present invention, when component (C) is blended, it can be appropriately set according to the balance with component (A), component (B), and other contained components. The content of component (C) is preferably 0.1 to 15% by mass, more preferably 0.3 to 10% by mass, and particularly preferably 0.5 to 3% by mass based on the total amount of the cosmetic.

[0017] (Optional component) In addition to the components (A), (B), and (C), the cosmetic of the present invention can contain an oily base material. Examples of the oily base material include vegetable oils and fats such as castor oil, cottonseed oil, sesame oil, jojoba oil, olive oil, and cocoa butter; lanolin such as beeswax and liquid lanolin, waxes such as candelilla wax, beeswax, and carnauba wax; paraffins such as petrolatum, liquid paraffin, and solid paraffin, higher hydrocarbons such as squalane, olefin oligomers, and plastibase; fatty acids such as lauric acid, myristic acid, stearic acid, and palmitic acid and their esters, base waxes, natural polymers, and hydrogenated polyisobutene. Among them, ester oils are preferred, and among them, pentaerythritol fatty acid ester compounds and malic acid ester compounds are preferred.

[0018] In addition to the components (A), (B), and (C), the cosmetic of the present invention may further contain at least one base material selected from the group consisting of polyol compounds, surfactants, higher alcohols, thickeners, chelating agents, preservatives, and silicones. The cosmetic of the present invention may contain a thickener, a pH adjuster, an ultraviolet absorber, an ultraviolet scattering agent, other functional components (physiological active components), a fragrance, a pigment, a solvent, and an extract of a natural product as long as the effects of the present invention are not impaired.

[0019] (Polyol compound) Examples of the polyol compound include ethylene glycol, butylene glycol (BG), polyethylene glycol, butylethylpropanediol, polypropylene glycol copolymer, propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, diglycerin, sorbitol, pentylene glycol, and ethylhexylglycerin. Among them, it is preferably at least one selected from the group consisting of butylene glycol, glycerin, polyethylene glycol, dipropylene glycol, pentylene glycol, ethylhexylglycerin, and sorbitol.

[0020] (Surfactant) Examples of surfactants include anionic surfactants such as polyoxyethylene sorbitan oleate, higher fatty acid soap, alkyl sulfate salts, polyoxyethylene alkyl ether sulfates, alkyl ether phosphate salts, N-acyl amino acid salts, and acyl N-methyl taurate salts; cationic surfactants such as alkyltrimethylammonium chloride and dialkyldimethylammonium chloride; amphoteric surfactants such as cocamidopropyl betaine, alkyldimethylaminoacetic acid betaine, alkylamidedimethylaminoacetic acid betaine, and 2-alkyl-N-carboxy-N-hydroxyimidazolinium betaine; and nonionic surfactants such as glycerin fatty acid esters, polyglycerin fatty acid esters, lecithin derivatives (e.g., lysolecithin), polyoxyethylene type (e.g., polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene glycerin fatty acid ester, etc.), polyhydric alcohol ester type, and ethylene oxide / propylene oxide block copolymer. In particular, at least one selected from the group consisting of glycerin fatty acid esters, polyglycerin fatty acid esters, lecithin derivatives, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, and polyoxyethylene glycerin fatty acid esters is preferred.

[0021] (High-grade alcohol) Examples of higher alcohols include cetanol, behenyl alcohol, and isohexadecyl alcohol. Of these, behenyl alcohol is preferred.

[0022] (Thickening agent) Examples of thickeners include polyacrylic acid, carrageenan, xanthan gum, sodium carboxymethylcellulose, carboxyvinyl polymer, polyoxyethylene glycol distearate, acrylic acid polymer, cellulose-based natural polymer, ethanol, neopentyl glycol dicaprate, and potassium myristate. Among these, at least one selected from the group consisting of acrylic acid polymer, xanthan gum, and cellulose-based natural polymer is preferred.

[0023] (Chelating agent) Examples of chelating agents include ethylenediaminetetraacetic acid (derivatives) such as etidronic acid and trisodium edetate. Among these, ethylenediaminetetraacetic acid is preferred.

[0024] (Preservative) Examples of preservatives include parabens and phenoxyethanol. Examples of parabens include methylparaben, propylparaben, and butylparaben.

[0025] (silicone) Examples of silicones include methylpolysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, cyclohexasiloxane, cyclopentasiloxane, trimethylsiloxysilicate, polyoxyethylene-methylpolysiloxane copolymer, silicone fluid, silicone rubber, and silicone oil.

[0026] The cosmetic composition of the present invention can be an emulsion, cream, lotion, or gel, but it is preferable to use a cosmetic composition containing 80-99% by mass of water, such as a lotion, because the excellent feel of the present invention (no stickiness or tightness) can be fully experienced. [Examples]

[0027] The present invention will be specifically explained below with reference to examples and comparative examples. <Comparative test of cosmetic compositions based on the compositions of Example 1 and Comparative Examples 1-8> 1. Test Method Cosmetics with the compositions shown in Table 1 below were prepared by conventional methods. Table 1 is expressed in mass percentage, with the total amount of the cosmetic being 100% by mass.

[0028] [Table 1]

[0029] Example 1 has a composition containing (A) 5% by mass of niacinamide and (B) 5% by mass of glycereth-26, which is polyoxyethylene glycerin (average number of moles of ethylene oxide is 26). On the other hand, Comparative Example 1 is a composition in which glycereth-26 of component (B) is replaced with water. Similarly, Comparative Example 2 is a composition in which glycerin 5% by mass is replaced with dipropylene glycol (DPG) 5% by mass is replaced with pentylene glycol 5% by mass is replaced with glycerin 3% by mass is replaced with dipropylene glycol (DPG) 4% by mass is replaced with pentylene glycol 5% by mass is replaced with methyl gluceth-10 5% by mass is replaced with glycereth-26 of component (B) with diglycerin 3% by mass is replaced with diglycerin 8% by mass is replaced with glycereth-26 of component (B).

[0030] The cosmetics of Example 1, Comparative Example 1, and Comparative Examples 2-8 were evaluated by applying them to the skin according to the following criteria. The sensory evaluation was determined by five experienced professional sensory evaluators who discussed and agreed on the feel of the product after application.

[0031] ■ Evaluation of stickiness during application A sensory evaluation was conducted on the stickiness that occurs when an appropriate amount of cosmetic is applied to the skin and blended in with a circular motion using the fingers. The cosmetic formulation of Comparative Example 1 (hereinafter referred to as the standard product) was used as a reference composition for comparison, and it was determined whether the feel of the new product was an improvement over that of the standard product. ○ = No stickiness was felt, unlike with the standard product. △ = The stickiness was perceived as being reduced compared to the standard product. However, a slight stickiness was still felt. × = I felt it was as sticky as or even stickier than the standard product.

[0032] ■Evaluation of the squeaky feeling after application After allowing the cosmetic product to fully absorb into the skin, it was left for 5 minutes, and then the application area was gently rubbed with a finger to perform a sensory evaluation of the squeaky feeling. It was then determined whether the squeaky feeling had improved compared to the standard product. ○ = No creaking noise was detected, unlike with the standard product. △ = The squeaking was perceived to be less pronounced than with the standard product (although a slight squeaking was still noticeable). × = I felt a creaking noise that was equal to or stronger than that of the standard product.

[0033] ■ Evaluation of moisturizing properties Two drops (approximately 0.1 mL) of each test cosmetic were applied to a skin area pre-marked with a 3 cm x 3 cm frame, and after being thoroughly absorbed, the area was left for 5 minutes. Subsequently, the moisture content of the applied area was measured using a stratum corneum moisture content measuring device "SKICON 200EX3 (manufactured by Yayoi Co., Ltd.)". The measured values ​​were rounded to the nearest whole number. All measurements were performed in a constant temperature and humidity room maintained at 23°C and 50% humidity. Before measurement, the forearm was washed with a 0.5% SDS aqueous solution and allowed to acclimate for 15 minutes. The stratum corneum moisture content measurements after applying each test sample are expressed in μS. Furthermore, to confirm the effects of the invention, the measurement values ​​of skin to which the formulation of Comparative Example 1 (standard product) was dropped were used as a reference (reference value), and the change in moisture content measurement values ​​of the areas to which each test sample was applied was determined from this reference value. The percentage change was calculated using the following formula. Change (%) = {Skin moisture content measurement value (μS) / Skin moisture value after applying one drop of comparative example (reference value in μS)} × 100 - 100 Furthermore, the evaluation criteria for moisturizing properties were as follows: ◎: The measured value when the test sample was applied increased significantly above the standard value (moisture content increased by 15% or more above the standard value). ○: The measured value when the test sample was applied increased slightly above the standard value (the increase in moisture content was more than 6% but less than 15% above the standard value). △: The measured value when the test sample is applied is almost the same as the reference value (the change in moisture content compared to the reference value is less than ±6%). ×: The measured value when the test sample was applied was below the standard value (the moisture content decreased by 6% or more compared to the standard value).

[0034] 2. Test Results The evaluation results for each item are shown in the lower section of Table 1. Specifically, in Example 1, the stickiness caused by the niacinamide was suppressed. Furthermore, no squeaky feeling was felt, and the moisturizing effect was also improved, with a moisture content increase of 6-14% compared to the standard. On the other hand, Comparative Example 2 showed a slight improvement in stickiness but a worsening of squeaky feeling. Comparative Examples 3 and 4 showed improvement in stickiness but a worsening of squeaky feeling. Comparative Example 5 showed a worsening of both stickiness and squeaky feeling. Comparative Examples 6 and 7 showed improvement in both stickiness and squeaky feeling. Comparative Example 8 did not show improvement in stickiness but did show improvement in squeaky feeling. Comparing Example 1 with Comparative Examples 2-8, Example 1 showed improved stickiness, significantly reduced squeaky feeling, and further improved moisturizing effect. In other words, to improve the stickiness and squeaky feeling caused by 5% by mass of niacinamide and to improve the moisturizing effect, it was most effective to include 5% by mass of glycereth-26, which is polyoxyethylene glycerin (average number of moles of ethylene oxide is 26).

[0035] <Tests using formulations from Examples 1-6> 1. Test Method To conduct an efficacy test by further adding component (C) to the formulation of Example 1, cosmetic compositions with the compositions shown in Table 2 below were prepared. Table 2 is expressed in mass%, with the total amount of the cosmetic composition being 100% by mass.

[0036] [Table 2]

[0037] The composition of Example 2 is as follows: (A) component is 5% by mass of niacinamide, (B) component is glycereth-26 reduced to 3% by mass compared to Example 1, and (C) component is diglycerin 2% by mass. Example 3 is a composition obtained by substituting (C) diglycerin with betaine in the composition of Example 2. Example 4 has a composition containing 3% by mass of glycereth-12 as component (B) and 3% by mass of diglycerin as component (C). Example 5 is a composition obtained by substituting (C) diglycerin with betaine in the composition of Example 4. Example 6 has a composition in which the amount of niacinamide in component (A) is reduced to 3% by mass, glycereth-26 in component (B) is 3% by mass, and (C) diglycerin and betaine are each 0.5% by mass.

[0038] 2. Test Results Similar to Test Example 1, the composition of Comparative Example 1 was used as the standard, and sensory evaluation tests and moisturizing properties were performed in the same manner. The results are shown in the lower section of Table 2. Examples 2-6, which contain diglycerin and / or betaine (component C) together with niacinamide (component A), (containing all three components A, B, and C), showed further improvement in stickiness compared to the cosmetic composition of Example 1, which did not contain component C. It was also found that the moisturizing properties were further enhanced. In other words, the stickiness during application in Example 1 (△ rating) is not at a level that would be problematic in actual use, but it was found that if you want to further improve the quality level of the user experience (reduction of stickiness, increase of moisturizing effect), it is good to include diglycerin and / or betaine, which is component (C), in addition to the composition of the cosmetic containing components (A) and (B) of the present invention.

[0039] The formulations of various cosmetics are shown below. <Example Form 1: Cosmetic Liquid> Blend amount (mass%) Niacinamide 5 Butylene glycol (BG) 5 Diglycerin 1.5 Betaine 0.5 Glycereth-26 3 Ethylhexylglycerin 0.05 Pentylene glycol 2 (Acrylates / C10-30 Alkyl Acrylate) Crosspolymer 0.05 Modified corn starch 0.4 Dipotassium glycyrrhizinate 0.1 K hydroxide 0.2 Citric acid 0.02 Sodium citrate 0.1 Purified water residual The resulting cosmetic liquid received positive evaluations for skin firmness, stickiness, tightness, and moisturizing properties.

[0040] <Example Prescription 2: Eye Cream> Blend amount (mass%) Niacinamide 5 Dipropylene glycol (DPG) 5 Glycerin 8 Glycereth-26 3 Betaine 0.5 Carbomer K 0.07 Dimer dilinoleate di(isostearyl / phytosteryl) 10 Tri(caprylic / capric / myristic / stearic)glyceryl 4 Macadamia nut fatty acid phytosteryl 4 Macadamia seed oil 4 Jojoba seed oil 4 Squalane 4 Dimethicone 4 Alkali alcohol 1.5 Behenyl alcohol 0.5 Tocopherol 0.03 Hydrogenated lecithin 1 Purified water residual The eye cream received positive evaluations for skin firmness, stickiness, tightness, and moisturizing properties.

[0041] <Formulation Example 3: Water-in-Oil Sunscreen Cream> Blend amount (mass%) Niacinamide 5 Titanium dioxide 9.5 Aluminum hydroxide 1.6 Hydrogen dimethicone 0.7 PEG-9 Polydimethylsiloxyethyl Dimethicone 3.5 PEG-9 Dimethicone 1 PEG-10 Dimethicone 1.5 Cyclopentasiloxane 17 Disteardimonium hectorite 0.5 Dextrin palmitate 1 Isotridecyl isononanoate 5 Diphenylsiloxy Phenylen Trimethicone 2 Silica 0.6 Butylene glycol (BG) 6 Glycereth-26 4 Betaine 0.5 Purified water residual The resulting sunscreen cream received positive evaluations for skin firmness, stickiness, tightness, and moisturizing properties.

[0042] <Example of prescription 4: Rinse-off pack> Blend amount (mass%) Niacinamide 5 Cetyl ethylhexanoate 47 Polyglyceryl-10 stearate 10 Polyglyceryl-10 Diisostearate 4 Glycereth-26 2 Betaine 0.50 Purified water residual The resulting rinse-off cosmetic pack received positive evaluations in terms of skin firmness, stickiness, tightness, and moisturizing properties.

[0043] <Formulation Example 5: Base Cream> Blend amount (mass%) Niacinamide 5 Titanium dioxide 10 Cyclopentasiloxane 10 Diphenylsiloxy Phenylen Trimethicone 7 Butylene glycol (BG) 6 Isotridecyl isononanoate 4 Talc 3 Glycereth-26 2 Diglycerin 1 Di(caprylic / capric acid)propanediol 3 Dimethicone 3 PEG-10 Dimethicone 1.5 Zinc oxide 2 Sorbitan sesquiisostearate 1 Polyglyceryl-2 Triisostearate 1 Sodium chloride 0.5 PEG-9 Dimethicone 1 Acrylates crosspolymer 1 Aluminum hydroxide 0.5 Mica 0.5 Stearic acid 0.5 Pentylene glycol 0.5 Disteardimonium hectorite 1 PEG / PPG-19 / 19 Dimethicone 0.2 Iron oxide 1.5 water residual The resulting primer cream received positive evaluations in terms of skin firmness, stickiness, tightness, and moisturizing properties.

Claims

1. A cosmetic composition containing the following (A) and (B). (A) Niacinamide 3% by mass or more (B) Glycereth-12

2. The cosmetic composition according to claim 1, further comprising (C) diglycerin and / or betaine.

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