Oil-in-water emulsified cosmetic

Abstract

To provide a liquid oil-in-water emulsified cosmetic capable of delivering superior moisturizing sensation, avoiding stickiness, achieving good affinity to skin, and maintaining stable properties over time.SOLUTION: A liquid oil-in-water emulsified cosmetic comprises the following components (A) to (D): (A) Acrylates / C10-30 Alkyl Acrylate Crosspolymer, (B) Phytosteryl / Octyldodecyl Lauroyl Glutamate, (C) Methyl gluceth-20, and (D) a higher alcohol having 16 to 22 carbon atoms and being solid at 20°C, wherein the content of component (A) is 0.05-0.3 wt.%, the content of component (B) is 0.5-5.0 wt.%, the content of component (D) is 0.1-1.0 wt.%, and the total amount of oil agent in the cosmetic is 3.0 wt.% or more and less than 10.0 wt.%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid oil-in-water emulsion cosmetic that has an excellent moist feeling, is non-sticky and blends well with the skin, and has good stability over time. [Background technology]

[0002] Oil-in-water emulsion cosmetics are widely used in cosmetics due to their excellent usability, such as high moisture content and a fresh feel. In particular, emulsion cosmetics using polymeric emulsifiers have been developed in many technologies due to their advantages such as low skin irritation and low stickiness when used at low concentrations.

[0003] On the other hand, polymer emulsifiers have inferior emulsifying power and poor emulsion stability compared to common low-molecular-weight emulsifiers. Therefore, to ensure stability, it is necessary to incorporate a high amount of polymer emulsifier and increase viscosity, which results in a high viscosity for a liquid oil-in-water emulsion cosmetic, which can feel sticky or difficult to blend into the skin.

[0004] Furthermore, oil-in-water emulsion cosmetics, such as lotions and creams, are used to moisturize the skin and may contain a large amount of oil to enhance the moist feeling. However, in order to stably emulsify a large amount of oil, a high amount of polymer emulsifier must be incorporated, and it has been difficult to achieve a moist feeling, non-sticky feel, and a comfortable feel on the skin with emulsion cosmetics that use a polymer emulsifier.

[0005] To solve these problems, a technology has been disclosed (Patent Document 1) that contains a polymeric emulsifier, one or more nonionic surfactants, an ester oil that is liquid at 25°C, and one or more selected from organic salts and inorganic salts, as a technology related to skin cosmetic compositions that have good emulsion stability, good skin compatibility, and a long-lasting moist feeling, but this technology was not satisfactory in terms of non-stickiness. Furthermore, a technology has been disclosed (Patent Document 2) that relates to an oil-in-water emulsion cosmetic that uses a polymeric emulsifier and has simultaneously improved many properties during use, but this technology is not satisfactory in terms of moist feeling and skin compatibility, and neither technology has achieved a moist feeling that is excellent in use and is not sticky and easily compatible with the skin. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-195349 [Patent Document 2] Patent Publication No. 2022-147656 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a liquid oil-in-water emulsion cosmetic that has an excellent moist feeling, is non-sticky and blends well with the skin, and has good stability over time. [Means for solving the problem]

[0008] That is, the present invention provides a composition comprising the following components (A) to (D): (A) (Acrylates / C10-30 alkyl acrylate) crosspolymer (B) Di(phytosteryl / octyldodecyl) lauroyl glutamate (C) Methylgluceth-20 (D) A higher alcohol having 16 to 22 carbon atoms that is solid at 20°C The present invention provides a liquid oil-in-water emulsion cosmetic comprising the above, characterized in that the content of component (A) is 0.05 to 0.3 wt %, the content of component (B) is 0.5 to 5.0 wt %, the content of component (D) is 0.1 to 1.0 wt %, and the total amount of oils in the cosmetic is 3.0 wt % or more and less than 10.0 wt %.

[0009] The present invention also provides a liquid oil-in-water emulsion cosmetic according to claim 1, characterized in that component (D) is hydrogenated rapeseed oil alcohol.

[0010] The present invention also provides the oil-in-water emulsion cosmetic according to claim 1 or 2, characterized in that the content of component (C) is 0.1 to 5.0% by weight. [Effects of the Invention]

[0011] The oil-in-water emulsion cosmetic of the present invention is a liquid oil-in-water emulsion cosmetic that has an excellent moist feeling, is non-sticky and blends well with the skin, and has good stability over time. BEST MODE FOR CARRYING OUT THE INVENTION

[0012] The content of component (A) (acrylates / C10-30 alkyl acrylate) crosspolymer of the present invention is 0.05 to 0.3 wt. % of the oil-in-water emulsion cosmetic, and preferably 0.1 to 0.2 wt. If component (A) is less than 0.05 wt. %, the stability over time may be poor and a satisfactory moist feeling may not be achieved, whereas if it exceeds 0.3 wt. %, the cosmetic may feel sticky or not blend well with the skin.

[0013] Component (A) of the present invention is a polymer consisting of acrylic acid and acrylic acid in which a C10-30 alkyl group is ester-bonded. Commercially available products include "Pemulen TR-1" (manufactured by Lubrizol Japan).

[0014] The content of component (B) di(phytosteryl / octyldodecyl) lauroyl glutamate in the oil-in-water emulsion cosmetic of the present invention is 0.5 to 5.0% by weight, preferably 1.0 to 3.0% by weight. If component (B) is less than 0.5% by weight, a satisfactory moist feeling may not be obtained, and if it exceeds 5.0% by weight, it may not blend well with the skin.

[0015] Component (B) of the present invention is a diester of lauroyl glutamic acid with a mixture of phytosterol and octyldodecanol. Commercially available products include "Plandool-LG2" (manufactured by Nippon Fine Chemical Co., Ltd.).

[0016] The content of methyl gluceth-20 (component (C)) of the present invention is not particularly limited, but is preferably 0.1 to 5.0% by weight, more preferably 0.1 to 2.0% by weight, of the oil-in-water emulsion cosmetic. If the content of component (C) is less than 0.1% by weight, a satisfactory moist feeling may not be obtained, whereas if it exceeds 5.0% by weight, the product may feel sticky or not blend well with the skin.

[0017] Component (C) of the present invention is a polyethylene glycol ether of methyl glucose. Commercially available products include "GLUCAM™ E-20 HUMECTANT" (manufactured by Lubrizol Japan Co., Ltd.).

[0018] The component (D) of the present invention, a higher alcohol having 16 to 22 carbon atoms that is solid at 20°C, is not particularly limited, but examples thereof include cetyl alcohol, stearyl alcohol, oleyl alcohol, arachyl alcohol, behenyl alcohol, and hydrogenated rapeseed oil alcohol, which is a mixture thereof, and one or more of these can be used in combination. Among these, stearyl alcohol, arachyl alcohol, behenyl alcohol, and hydrogenated rapeseed oil alcohol are preferred, with hydrogenated rapeseed oil alcohol being more preferred, in terms of their excellent moisturizing effect.

[0019] The content of component (D) of the present invention is 0.1 to 1.0% by weight, preferably 0.3 to 0.5% by weight, of the oil-in-water emulsion cosmetic. If the content of component (D) is less than 0.1% by weight, the stability over time may be poor and a satisfactory moist feeling may not be obtained, while if it exceeds 1.0% by weight, the cosmetic may feel sticky or not blend well with the skin.

[0020] The total amount of oil in the oil-in-water emulsion cosmetic of the present invention is 3.0% by weight or more and less than 10.0% by weight, and preferably 4.0% by weight or more and less than 7.0% by weight. If the total amount of oil is less than 3.0% by weight, a satisfactory moist feeling may not be obtained, and if it is 10.0% by weight or more, stability over time and compatibility with the skin may be poor.

[0021] In the present invention, the oil agent is not particularly limited, but examples thereof include vegetable oils, hydrocarbon oils, ester oils, silicone oils, higher fatty acids, and lipids. Specific examples include jojoba oil, olive oil, macadamia seed oil, meadowfoam oil, Theobroma grandiflorum seed butter, mineral oil, squalane, hydrogenated polyisobutene, petrolatum, octyldodecyl myristate, isononyl isononanoate, isotridecyl isononanoate, isostearyl isostearate, diisostearyl malate, glyceryl / polyglyceryl-6 isostearate / behenic acid esters, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, dimethicone, diphenylsiloxyphenyl trimethicone, stearic acid, behenic acid, ceramides, and hydrogenated lecithin. One or more of these oil agents may be used in combination.

[0022] In addition to the above-mentioned essential components, the oil-in-water emulsion cosmetic of the present invention may contain components commonly used in cosmetics, such as nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, aqueous components, water-soluble polymers, antioxidants, ultraviolet absorbers, fragrances, chelating agents, preservatives, colorants, cosmetic ingredients, etc., within the range that does not impair the effects of the present invention.

[0023] The oil-in-water emulsion cosmetic of the present invention is applicable to liquid basic cosmetics such as serums and emulsions, and the oil-in-water emulsion cosmetic of the present invention is in the form of an emulsion.

[0024] In the liquid oil-in-water emulsion cosmetic of the present invention, "liquid" refers to a cosmetic having a viscosity of 1 to 20,000 mPa·s under an environment of 25°C and atmospheric pressure. The viscosity can be measured using a B-type viscometer (model: TVB-10) manufactured by Toki Sangyo Co., Ltd., under the following measurement conditions: rotor No. 4, 12 rpm, 30 seconds; if the viscosity is less than 10,000 mPa·s, rotor No. 3, 12 rpm, 30 seconds; if the viscosity is less than 2,500 mPa·s, rotor No. 2, 12 rpm, 30 seconds; if the viscosity is less than 500 mPa·s, rotor No. 1, 12 rpm, 30 seconds. [Example]

[0025] The present invention will be described in more detail below with reference to examples, but the technical scope of the present invention is not limited to these examples. The contents are expressed in % by weight unless otherwise specified.

[0026] (Manufacturing method) Ingredients 1 to 5 were mixed uniformly and heated to 80°C to form the oil phase. Ingredients 6 to 14 were mixed uniformly and heated to 80°C to form the water phase. The oil and water phases were mixed and then cooled to 30°C to obtain an oil-in-water emulsion cosmetic.

[0027] Oil-in-water emulsion cosmetics having the compositions shown in Tables 1 to 5 below were prepared, and the stability over time and usability ("skin compatibility," "stickiness," and "moisturizing feeling" immediately after use of each cosmetic) were evaluated using the following test methods. The results are shown in Tables 1 to 5.

[0028] (Evaluation method) Stability test over time The sample was left at 50°C for one month, and then the appearance was observed visually and under a microscope and rated according to the following criteria. ○: No separation, aggregation or precipitation was observed in terms of appearance or emulsified particles. ×: Separation, aggregation, and precipitation were observed in the appearance and emulsified particles.

[0029] Usability test (skin compatibility) A usage test was conducted by a panel of 20 experts, who judged the skin compatibility on a two-point scale of "good" or "bad" according to the following criteria. ◎: 16 or more people rated it as blending well with the skin. ○: 11 to 15 people evaluated that it blended well with the skin. △: 6 to 10 people evaluated that it blended well with the skin. ×: Five or fewer people rated the product as blending well with the skin.

[0030] Usability test (stickiness) A usage test was conducted by a panel of 20 experts, who judged stickiness on a two-point scale of "yes" or "no," and evaluated it according to the following criteria. ⊚: 16 or more people evaluated that there was no stickiness. ○: 11 to 15 people evaluated that there was no stickiness. △: 6 to 10 people evaluated that there was no stickiness. ×: Five or fewer people rated it as not sticky.

[0031] Usability test (moisturizing feeling) A usage test was conducted by a panel of 20 experts, who judged the moist feeling on a two-point scale of "yes" or "no" according to the following criteria. ◎: 16 or more people rated it as having a moist feeling. ○: 11 to 15 people rated it as having a moist feeling. △: 6 to 10 people rated it as having a moist feeling. ×: Five or fewer people rated it as moist.

[0032] [Table 1] *1 NIKKOL SS-10V (manufactured by Nikko Chemicals) *2 Plandool-LG2 (manufactured by Nippon Fine Chemical Co., Ltd.) *3 Alcohol No. 20-B (Kyukyu Alcohol Kogyo Co., Ltd.) *4 NAA-222S (manufactured by NOF Corporation) *5 GLUCAM™ E-20 HUMECTANT (manufactured by Lubrizol Japan) *6 Pemulen TR-1 (manufactured by Lubrizol Japan) *7 SEPIMAX ZEN (manufactured by SEPIC) *8 Echo Gum (MP Gokyo Food & Chemical Co., Ltd.)

[0033] As shown in Examples 1 to 4 in Table 1, when the (acrylates / alkyl acrylate (C10-30)) crosspolymer was contained in an amount of 0.05 to 0.3 wt%, satisfactory results were obtained in all evaluated items. Among these, when the (acrylates / alkyl acrylate (C10-30)) crosspolymer was contained in an amount of 0.1 to 0.2 wt%, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Examples 1 to 3, when the (acrylates / alkyl acrylate (C10-30)) crosspolymer was not contained, or when it was contained in an amount less than 0.05 wt%, or more than 0.3 wt%, satisfactory results were not obtained in terms of stability over time, skin compatibility, etc. Furthermore, as shown in Comparative Example 4, when polyacrylate crosspolymer-6 was contained instead of the (acrylic acid / alkyl (C10-30)) crosspolymer, satisfactory results were not obtained in terms of skin compatibility and stickiness.

[0034] [Table 2] *9 Plandool LG-1 (manufactured by Nippon Fine Chemical Co., Ltd.) *10 Cosmol 222(S) (manufactured by Nisshin Oillio Co., Ltd.) *11 KAK 139 (Kyushu Alcohol Kogyo Co., Ltd.)

[0035] As shown in Examples 5 to 8 in Table 2, when lauroyl glutamate di(phytosteryl / octyldodecyl) was contained in an amount of 0.5 to 5.0 wt%, satisfactory results were obtained in all evaluated items, and particularly when lauroyl glutamate di(phytosteryl / octyldodecyl) was contained in an amount of 1.0 to 3.0 wt%, satisfactory results were obtained. On the other hand, as shown in Comparative Examples 5 to 7, when lauroyl glutamate di(phytosteryl / octyldodecyl) was not contained, or when lauroyl glutamate di(phytosteryl / octyldodecyl) was contained in an amount of less than 0.5 wt%, or more than 5.0 wt%, satisfactory results were not obtained in terms of moist feeling, skin compatibility, etc. Furthermore, as shown in Comparative Examples 8 to 10, when an ester oil other than lauroyl glutamate di(phytosteryl / octyldodecyl) was contained, satisfactory results were not obtained in terms of skin compatibility, moist feeling, etc.

[0036] [Table 3] *12 MacbioBride MG-10P (NOF Corporation) *13 MacbioBride MG-20P (NOF Corporation) *14 Diglycerin S (manufactured by Sakamoto Pharmaceutical Co., Ltd.)

[0037] As shown in Examples 9 to 14 in Table 3, when methyl gluceth-20 was contained, satisfactory results were obtained in all evaluated items. Among these, when methyl gluceth-20 was contained in an amount of 0.1 to 5.0 wt %, satisfactory results were obtained, and when methyl gluceth-20 was contained in an amount of 0.1 to 2.0 wt %, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Example 11, when methyl gluceth-20 was not contained, satisfactory results were not obtained in terms of moist feeling. Furthermore, as shown in Comparative Examples 12 to 14, when a water-soluble moisturizer other than methyl gluceth-20 was contained, satisfactory results were not obtained in terms of moist feeling, skin compatibility, etc.

[0038] [Table 4] *15 Cetyl Alcohol NX (Kyukyu Alcohol Kogyo Co., Ltd.) *16 Stearyl Alcohol NX (Kyukyu Alcohol Kogyo Co., Ltd.) *17 High Nol 20SS (Kyukyu Alcohol Kogyo Co., Ltd.) *18 Behenyl alcohol (Kyukyu Alcohol Kogyo Co., Ltd.) *19 Isostearyl Alcohol EX (Kyushu Alcohol Kogyo Co., Ltd.)

[0039] As shown in Examples 15 to 22 in Table 4, when a higher alcohol having 16 to 22 carbon atoms that is solid at 20°C was contained in an amount of 0.1 to 1.0 wt%, satisfactory results were obtained in all of the evaluated items. Among these, when a hydrogenated rapeseed oil alcohol was contained and its content was 0.3 to 0.5 wt%, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Examples 15 to 17, when a higher alcohol having 16 to 22 carbon atoms that is solid at 20°C was not contained, or when it was contained in an amount of less than 0.1 wt%, or more than 1.0 wt%, satisfactory results were not obtained in terms of stability over time, moist feeling, etc. Furthermore, as shown in Comparative Example 18, when isostearyl alcohol, a branched saturated alcohol that is liquid at 20°C, was contained, satisfactory results were not obtained with respect to stability over time.

[0040] [Table 5]

[0041] As shown in Examples 23 to 27 in Table 5, when the total amount of oil in the oil-in-water emulsion cosmetic was 3.0 wt% or more and less than 10.0 wt%, satisfactory results were obtained in all of the evaluated items, and particularly satisfactory results were obtained when the total amount of oil in the oil-in-water emulsion cosmetic was 4.0 wt% or more and less than 7.0 wt%. On the other hand, as shown in Comparative Examples 19 and 20, when the total amount of oil in the oil-in-water emulsion cosmetic was less than 3.0 wt% or 10.0 wt% or more, satisfactory results were not obtained in terms of stability over time, compatibility with the skin, etc.

[0042] Other examples of the present invention are shown below. In all of Examples 28 to 30, a liquid oil-in-water emulsion cosmetic was obtained that had an excellent moist feeling, was non-sticky and blended well with the skin, and had good stability over time.

[0043] Example 28: Serum (Ingredients) (Weight%) (1) Sorbitan stearate*1 0.3 (2) Squalane 2.0 (3) Phytosteryl / Octyldodecyl Lauroyl Glutamate*2 2.0 (4) Hydrogenated rapeseed oil alcohol*3 0.4 (5) Stearyl alcohol *16 0.1 (6) Behenic acid *4 0.5 (7) Ceramide NG*20 0.1 (8) Purified water remainder (9) 1,3-butylene glycol 10.0 (10) Glycerin 10.0 (11) Methylgluceth-20*5 1.0 (12) (Acrylates / C10-30 alkyl acrylate) crosspolymer*6 0.1 (13) Xanthan gum*8 0.05 (14) Sodium hyaluronate*21 0.05 (15) Preservatives, appropriate amount (16) Neutralizer (appropriate amount) (17) Water-soluble collagen*22 0.5 (18) Flavoring (appropriate amount) *20 CERAMIDE TIC-001 (Takasago International Corporation) *21 PEMS-HY (manufactured by Technoble) *22 Arfomarin-CL (manufactured by Technoble Co., Ltd.)

[0044] (Manufacturing method) Ingredients 1 to 7 were mixed uniformly and heated to 80°C to form the oil phase. Ingredients 8 to 16 were mixed uniformly and heated to 80°C to form the water phase. After mixing the oil and water phases, ingredients 17 and 18 were added at 70°C and the mixture was cooled to 30°C to obtain a cosmetic serum.

[0045] Example 29: Emulsion (Ingredients) (Weight%) (1) Sorbitan stearate*1 0.5 (2) Meadowfoam oil *23 2.0 (3) Jojoba seed oil *24 1.0 (4) Isostearyl isostearate *25 1.0 (5) Phytosteryl / Octyldodecyl Lauroyl Glutamate*2 1.5 (6) Hydrogenated rapeseed oil alcohol*3 0.2 (7) Cetyl alcohol *15 0.1 (8) Behenyl alcohol *18 0.1 (9) Hydrogenated phospholipid*26 0.1 (10) Purified water remainder (11) Methylgluceth-20*5 2.0 (12) (Acrylates / C10-30 alkyl acrylate) crosspolymer*6 0.12 (13) Carboxyvinyl polymer 0.03 (14) Sodium hyaluronate*21 0.05 (15) Dipropylene glycol 10.0 (16) Glycerin 5.0 (17) Diglycerin *14 2.0 (18) Preservatives, appropriate amount (19) Neutralizer (appropriate amount) (20) Flavoring (appropriate amount) *23 Croda Pure Medfoam (manufactured by Croda Japan) *24 NIKKOL Jojoba Oil E (Nikko Chemicals) *25 Crodamol ISIS-LQ-(MV) (manufactured by Croda Japan) *26 Coatsome NC-21 (NOF Corporation)

[0046] (Manufacturing method) Ingredients 1 to 9 were mixed uniformly and heated to 80°C to form the oil phase. Ingredients 10 to 19 were mixed uniformly and heated to 80°C to form the water phase. After mixing the oil and water phases, ingredient 20 was added at 70°C and the mixture was cooled to 30°C to obtain an emulsion.

[0047] Example 30: Emulsion (Ingredients) (Weight%) (1) Sorbitan stearate*1 1.0 (2) Hydrogenated polyisobutene*27 1.0 (3) Meadowfoam oil*23 1.5 (4) Jojoba seed oil *24 1.0 (5) Phytosteryl / Octyldodecyl Lauroyl Glutamate*2 2.5 (6) Hydrogenated rapeseed oil alcohol*3 0.2 (7) Cetyl alcohol *11 0.1 (8) Stearyl alcohol *16 0.2 (9) Hydrogenated phospholipid*26 0.1 (10) Purified water remainder (11) Methylgluceth-20*5 2.0 (12) (Acrylates / C10-30 alkyl acrylate) crosspolymer*6 0.12 (13) Xanthan gum*8 0.03 (14) 1,3-butylene glycol 10.0 (15) Glycerin 5.0 (16) Diglycerin *14 2.0 (17) Preservatives, appropriate amount (18) Neutralizer (appropriate amount) (19) Water-soluble collagen*22 0.1 (20) Flavoring (appropriate amount) *27 Pearleem EX (NOF Corporation)

[0048] (Manufacturing method) Ingredients 1 to 9 were mixed uniformly and heated to 80°C to form the oil phase. Ingredients 10 to 18 were mixed uniformly and heated to 80°C to form the water phase. After mixing the oil and water phases, ingredients 19 and 20 were added at 70°C and the mixture was cooled to 30°C to obtain an emulsion. [Industrial Applicability]

[0049] According to the present invention, it is possible to provide a liquid oil-in-water emulsion cosmetic that has an excellent moist feeling, is non-sticky and blends well with the skin, and has good stability over time.

Claims

1. The following components (A) to (D) (A) (Acrylates / C10-30 alkyl acrylate) crosspolymer (B) di(phytosteryl / octyldodecyl) lauroyl glutamate (C) Methylgluceth-20 (D) A higher alcohol having 16 to 22 carbon atoms that is solid at 20°C a liquid oil-in-water emulsion cosmetic comprising the above components, wherein the content of component (A) is 0.05 to 0.3 wt %, the content of component (B) is 0.5 to 5.0 wt %, the content of component (D) is 0.1 to 1.0 wt %, and the total amount of oils in the cosmetic is 3.0 wt % or more and less than 10.0 wt %.

2. 2. The liquid oil-in-water emulsion cosmetic according to claim 1, wherein component (D) is hydrogenated rapeseed oil alcohol.

3. 3. The liquid oil-in-water emulsion cosmetic according to claim 1, wherein the content of component (C) is 0.1 to 5.0% by weight.

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