Whitening inhibitor, and emulsion composition or emulsion cosmetic containing the same

Abstract

To provide an oil-in-water type emulsion composition that can suppress whitening or foaming when the emulsion composition is applied to skin, and gives comfortable use feeling.SOLUTION: Provided is an emulsion composition or an emulsion cosmetic having excellent use feeling that can suppress whitening or foaming when applied to skin by blending alkyl phosphate ester having a plurality of alkyl groups to the emulsion composition.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a whitening inhibitor and an emulsion composition or emulsion cosmetic containing the same which does not whiten the skin when applied thereto. [Background technology]

[0002] It is important that cosmetics give a pleasant feeling when applied to the skin. In addition to the feel of the product, such as the ease of spreading and application, it is also important that the product is visually pleasant. Preparations that remain white on the skin for a long time when applied tend to be disliked. This is called whitening or foaming, and is a phenomenon in which air is caught in the emulsion composition remaining on the skin by the movement of the fingers during application, causing foaming, or water evaporates or penetrates during application, changing the emulsion state, and components such as higher alcohols remain on the skin and appear white. These phenomena generally occur when applying skin care cosmetics made of oil-in-water emulsion compositions, and highly polymerized silicones are often used to suppress this whitening. Highly polymerized silicones have low compatibility with various components, so they exist alone in the emulsion composition, and it is thought that this can suppress whitening and foaming by disturbing the interface when whitening and foaming occur. Therefore, suppressing whitening during application is particularly important in the formulation design of cosmetics.

[0003] On the other hand, due to the recent social trend of preferring plant-derived raw materials, the use of silicone is being avoided, and there is a demand for materials other than silicone that have whitening inhibition and anti-foaming effects. Besides silicones, alkylene oxide derivatives have been proposed as defoamers, but these are also made from petroleum-derived ethylene oxide or propylene oxide and do not meet the social need for plant-derived raw materials (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7202524 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above-mentioned problems in the conventional technology, and has an object to provide a whitening inhibitor, and an emulsion composition or cosmetic that can suppress whitening and foaming when applied to the skin. [Means for solving the problem]

[0006] As a result of intensive research, the inventors have found that by incorporating an alkyl phosphate ester having multiple alkyl groups, as shown in general formula (1) or (2), into an emulsion composition or emulsion cosmetic, it is possible to suppress whitening and foaming when applied to the skin and provide a good feel when used, thereby completing the present invention. Effect of the Invention

[0007] By incorporating an alkyl phosphate ester having multiple alkyl groups into an emulsion composition or emulsion cosmetic of the present invention, whitening and foaming upon application to the skin can be suppressed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the embodiments of the present invention will be described in more detail. In the present invention, regardless of the combination of materials used in the emulsion composition or emulsion cosmetic, one or more alkyl phosphate esters represented by general formula (1) and / or (2) can be used in combination. [ka] (R1, R2, and R3 in the general formula (1) and / or (2) each represent a saturated or unsaturated alkyl group having 12 to 22 carbon atoms. In addition, R1, R2, and R3 each include at least one alkyl group.)

[0009] In the alkyl phosphate esters represented by the general formulas (1) and / or (2), R1, R2, and R3 may all have the same number of carbon atoms, or may have different numbers of carbon atoms. For example, in the general formula (1), R1, R2, and R3 may all be the same, such as having 16 carbon atoms, or may all have different numbers of carbon atoms, such as R1 having 12 carbon atoms, R2 having 16 carbon atoms, and R3 having 20 carbon atoms. In the general formula (2), R1 and R2 may also be the same, such as having 16 carbon atoms, or may be different, such as R1 having 14 carbon atoms and R2 having 22 carbon atoms. The alkyl phosphate ester represented by the general formula (2) is preferably one having two alkyl groups introduced therein.

[0010] The amount of the alkyl phosphate ester represented by general formula (1) and / or (2) blended in the emulsion composition or emulsion cosmetic is 0.1 to 5.0% by mass, preferably 0.5 to 3.0% by mass, which can suppress whitening and foaming when applied to the skin.

[0011] The emulsion composition or emulsion cosmetic containing the alkyl phosphate of the present invention can be blended with various components that are usually used in cosmetics or topical skin preparations, such as surfactants, oily components, active components, moisturizing components, antibacterial components, viscosity adjusters, pigments, pearlescent agents, and fragrances, within the scope of not impairing the effects of the present invention.

[0012] Examples of the surfactant include nonionic surfactants such as polyoxyethylene alkyl ethers, polyglycerol fatty acid esters, sucrose fatty acid esters, and alkyl polyglucosides; anionic surfactants such as acyl glutamate, acyl glycine, acyl sarcosine salt, acyl methyl taurine salt, alkyl ether carboxylate, alkyl phosphate ester, alkyl ether sulfate, and fatty acid soap; cationic surfactants such as alkyl ammonium salts and amidoamine; and amphoteric surfactants such as imidazolium type and betaine acetate type.

[0013] As the oily component, any oily component generally used in cosmetics can be suitably used.Specific examples include higher alcohols such as isooctanol, octanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, oleyl alcohol, cetostearyl alcohol, stearyl alcohol, behenyl alcohol, and isostearyl alcohol, fatty acids such as octanoic acid, isooctanoic acid, capric acid, lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, behenic acid, linoleic acid, and linolenic acid, hydrocarbon oils such as squalane and liquid paraffin, ester oils such as cetyl isooctanoate and triethylhexanoin, ether oils such as diisononyl ether and dicaprylyl ether, animal and vegetable oils such as olive oil, jojoba oil, and shea butter, and silicone oils such as diphenyl dimethicone and diphenylsiloxyphenyl trimethicone.

[0014] Active ingredients include whitening agents such as ascorbic acid, magnesium ascorbyl phosphate, ascorbyl palmitate, ascorbyl stearate, ascorbyl tetraisopalmitate, ascorbyl glucoside, arbutin, ellagic acid, and rucinol, NMF components such as amino acids, skin roughness prevention agents such as water-soluble collagen, elastin, glycyrrhizic acid, glycyrrhetinic acid, and ceramide, anti-aging agents such as retinol and vitamin A acid, and various vitamins and their derivatives.

[0015] Moisturizing ingredients include 1,3-butylene glycol, dipropylene glycol, propanediol, glycerin, diglycerin, sorbitol, xylitol, maltitol, chondroitin sulfate, hyaluronic acid, sodium pyrrolidone carboxylate, and the like.

[0016] Antibacterial ingredients include methylparaben, propylparaben, phenoxyethanol, ethylhexylglycerin, glyceryl caprylate, benzoic acid, sodium benzoate, sodium dehydroacetate, and the like.

[0017] Viscosity adjusters include synthetic polymers such as carbomer, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropylethyl cellulose, and natural polymers such as alginic acid, carrageenan, agar, guar gum, quince seed, konjac mannan, tamarind gum, tara gum, dextrin, starch, gum arabic, locust bean gum, karaya gum, ghatti gum, tragacanth gum, xanthan gum, gellan gum, pectin, and cellulose.

[0018] Examples of the dyes include synthetic dyes and colored pigments, and examples of the synthetic dyes include Red No. 104, Red No. 201, Red No. 202, Red No. 204, Red No. 213, Red No. 220, Red No. 226, Red No. 227, Yellow No. 4, and Blue No. 1. Examples of the colored pigments include red iron oxide, yellow iron oxide, black iron oxide, titanium oxide, ultramarine, and Prussian blue.

[0019] Examples of the pearling agent include polarized pearling agents made of mica or titanium oxide, colored pearling agents made of iron oxide, titanium oxide, or mica, glass powder, laminates, and the like.

[0020] Furthermore, examples of emulsion compositions or emulsion cosmetics containing the whitening inhibitor of the present invention include skin care cosmetics such as essences, milks, creams, cleansing agents, massage agents, and sunscreen agents, and hair care agents such as treatments, conditioners, and hair styling agents, but are not limited to these.

[0021] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. The mass % shown below refers to the mass % of the entire composition. EXAMPLES

[0022] 1. Preparation of dialkyl phosphate esters A) Manufacturing method 1 molar equivalent of higher alcohol was melted, and 0.5 molar equivalent of phosphorus oxychloride was added dropwise while vigorously stirring to start the reaction. The reaction was carried out under a nitrogen atmosphere for 2 hours at 60°C after the dropwise addition was completed, and then ion-exchanged water was added and hydrolysis was carried out for 4 hours or more. The reaction solution was then washed with water, and the resulting product was recrystallized from methanol to obtain a dialkyl phosphate ester as a white crystal. The following invention products were obtained using lauryl alcohol, cetyl alcohol, and arachyl alcohol as higher alcohols. Invention Product 1: Dilauryl phosphate ester Invention product 2: Dicetyl phosphate ester Invention product 3: Diaralkyl phosphate ester

[0023] 2. Production of trialkyl phosphate esters A) Manufacturing method 1 molar equivalent of higher alcohol was melted, and 0.33 molar equivalent of phosphorus oxychloride was added dropwise while vigorously stirring to start the reaction. The reaction was carried out under a nitrogen atmosphere for 2 hours at 60°C after the dropwise addition was completed, and the reaction liquid was washed with water. The obtained product was recrystallized from methanol to obtain a trialkyl phosphate ester as white crystals. Using myristyl alcohol, stearyl alcohol, and behenyl alcohol as higher alcohols, the following invention products were obtained. Invention Product 4: Trimyristyl phosphate ester Invention product 5: Tristearyl phosphate ester Invention Product 6: Tribehenyl phosphate

[0024] 3. Preparation of emulsion composition An emulsion composition was prepared according to the composition shown in Table 1. Phase A and phase B were both heated and uniformly dissolved, and then phase A was added to phase B and emulsified by sufficient stirring to obtain Examples 1 to 9 and Comparative Example 1. The prepared emulsion compositions were subjected to the following evaluations. (1) Confirmation of anti-whitening effect 0.1 g of the prepared emulsion composition was applied to the inside of the forearm, and the pad of the index finger was run over the skin in a circular motion 10 times. The degree of whitening remaining on the skin was then rated on a three-point scale of ◎, ○, or × in order of whether whitening was suppressed. ◎ and ○ indicated that there was a whitening suppression effect, and × indicated that there was no whitening suppression effect. ◎: No whitening observed when swiped over skin about 5 times ○: No whitening observed when slid over the skin 10 times ×: A lot of whitening was observed when the product was slid over the skin 10 times.

[0025] [Table 1]

[0026] Below are some examples using the product of the present invention. The blending amount is mass %. The whitening inhibitory effect of the obtained preparation was confirmed by the above-mentioned method.

[0027] (Example 10) Milk essence (A) NIKKOL Nikomurus 41S 1.50 (mass%) Invention product 1 0.30 Invention product 4 0.30 Cetanol 1.50 NIKKOL MGS-BV2 0.50 NIKKOL Sugar Squalane 3.00 NIKKOL Trifat S-308 4.00 (B) Arginine 0.30 Glycerin 7.00 1,3-BG 5.00 Phenoxyethanol 0.30 Purified water remainder Total 100.00 *NIKKOL Nikomurus 41S: Behenyl alcohol, polyglyceryl-10 pentastearate, sodium stearoyl lactylate (manufactured by Nikko Chemicals) *NIKKOL MGS-BV2: Glyceryl stearate (manufactured by Nikko Chemicals) *NIKKOL Sugar Squalane: Squalane (manufactured by Nikko Chemicals) *NIKKOL Trifat S-308: Triethylhexanoin (manufactured by Nikko Chemicals) Preparation method: After heating and dissolving phases A and B uniformly, phase A was added to phase B and emulsified by sufficient stirring to obtain an emulsion composition. Anti-whitening effect: ◎

[0028] (Example 11) Moisturizing cream (A) NIKKOL Nikomurus LC-EF 5.00 (mass%) Invention 2 1.00 Cetostearyl alcohol 2.50 NIKKOL Triester F-810 5.00 NIKKOL Sugar Squalane 5.00 (B) Arginine 0.20 Carbomer 0.20 Glycerin 3.00 1,3-BG 3.00 Phenoxyethanol 0.30 Purified water remainder Total 100.00 *NIKKOL Nikomulus LC-EF: Stearyl alcohol, behenyl alcohol, phytosterols, glyceryl stearate, polyglyceryl-10 myristate, hydrogenated lecithin, tri(caprylic acid / capric acid)glyceryl (manufactured by Nikko Chemicals Co., Ltd.) *NIKKOL Triester F-810: Tri(caprylic / capric acid)glyceryl (manufactured by Nikko Chemicals) *NIKKOL Sugar Squalane: Squalane (manufactured by Nikko Chemicals) Preparation method: After heating and dissolving phases A and B uniformly, phase A was added to phase B and emulsified by sufficient stirring to obtain an emulsion composition. Anti-whitening effect: ◎

[0029] (Example 12) Skin care cream (A) NIKKOL Nikolipid 81S 3.50 (mass%) Invention 3 1.20 This invention 5 3.00 Behenyl Alcohol 0.50 NIKKOL Trifat S-308 20.00 NIKKOL Sugar Squalane 4.00 NIKKOL Macadamia Nut Oil 4.00 (B) Xanthan gum 0.20 Carbomer 0.10 Glycerin 5.00 Arginine 0.10 Phenoxyethanol 0.30 Purified water remainder Total 100.00 *NIKKOL Nikolipid 81S: batyl alcohol, stearic acid, lecithin, tri(caprylic acid / capric acid)glyceryl (manufactured by Nikko Chemicals) *NIKKOL Trifat S-308: Triethylhexanoin (manufactured by Nikko Chemicals) *NIKKOL Sugar Squalane: Squalane (manufactured by Nikko Chemicals) *NIKKOL Macadamia Nut Oil: Macadamia seed oil (manufactured by Nikko Chemicals) Preparation method: After heating and dissolving phases A and B uniformly, phase A was added to phase B and emulsified by sufficient stirring to obtain an emulsion composition. Anti-whitening effect: ◎ [Industrial Applicability]

[0030] The product of the present invention contains a whitening inhibitor, and thereby it is possible to provide an emulsion composition or emulsion cosmetic that inhibits whitening upon application to the skin and has a pleasant feel when used.

Claims

1. A whitening inhibitor represented by the following general formula (1) and / or (2) which is contained in an emulsion composition or an emulsion cosmetic. 【Chemistry 1】 (R in general formula (1) and / or (2) １ , R ２ , R ３ represents a saturated or unsaturated alkyl group having 12 to 22 carbon atoms. １ , R ２ , R ３ Contains at least one or two or more alkyl groups.

2. An emulsion composition comprising the whitening inhibitor according to claim 1.

3. An emulsion cosmetic comprising the whitening inhibitor according to claim 1.

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