Solid water-in-oil emulsion cosmetic

Abstract

To provide solid water-in-oil emulsion cosmetics that are free of synthetic or mineral waxes, silicones, and polyether-modified silicones, offering superior shape retention, stability, and user-friendliness.SOLUTION: Solid water-in-oil emulsion cosmetics comprise the following components: (A) vegetable wax comprising (a) sunflower seed wax; (B) polyglycerol-condensed ricinoleic acid ester; (C) polyglycerol diisostearic acid ester; and (D) liquid hydrocarbon oil. In the cosmetics, a content of the component (A) is 4-12 mass%, and a content of the component (a) in the component (A) ((a) / (A)) is 40 mass% or more; in the cosmetics, a content of the component (B) is 0.5-4 mass%; in the cosmetics, a content of the component (C) is 0.5-3 mass%; and in the cosmetics, a content of the component (D) is 8-20 mass%.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a solid water-in-oil emulsified cosmetic.

Background Art

[0002] In conventional solid water-in-oil emulsified products, from the viewpoint of shape retention, synthetic or mineral hydrocarbon waxes are used as solidifying agents. However, when the blending amount of synthetic or mineral hydrocarbon waxes increases, there are problems such as squeaky feel and lack of freshness, so silicone or polyether-modified silicone is generally blended to improve usability (for example, Patent Document 1).

[0003] On the other hand, due to the growing global awareness of environmental protection, SDGs-compliant cosmetics that do not contain hydrocarbon waxes, silicone or polyether-modified silicone are demanded.

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a solid water-in-oil emulsified cosmetic that has sufficient shape retention while using vegetable wax, and is excellent in stability and usability even without blending silicone or polyether-modified silicone.

Means for Solving the Problem

[0006] As a result of diligent research, the inventors have discovered that by using a plant-based wax containing sunflower seed wax and a specific polyglycerin fatty acid ester, a solid water-in-oil emulsion cosmetic composition with excellent shape retention, stability, and usability can be obtained.

[0007] In other words, the present invention provides a water-in-oil emulsion cosmetic comprising the following components: (A) (a) a vegetable wax containing sunflower seed wax, (B) polyglycerin condensed ricinoleic acid ester, (C) polyglycerin diisostearate ester, and (D) liquid hydrocarbon oil, wherein the content of component (A) in the cosmetic is 4 to 12% by mass, the content of component (a) in component (A) ((a) / (A)) is 40% by mass or more, the content of component (B) in the cosmetic is 0.5 to 4% by mass, the content of component (C) in the cosmetic is 0.5 to 3% by mass, and the content of component (D) in the cosmetic is 8 to 20% by mass.

[0008] Preferably, the content of component (A) in the cosmetic composition is 4 to 10% by mass, and / or (a) / (A) is 45% by mass or more.

[0009] It is preferable that the content of component (B) in the above cosmetic composition is 0.8 to 3.5% by mass.

[0010] It is preferable that the content of component (C) in the aforementioned cosmetic composition is 0.8 to 2.5% by mass.

[0011] The content of component (D) in the aforementioned cosmetic composition is preferably 8.5 to 18% by mass. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an environmentally friendly solid water-in-oil emulsion cosmetic that has high shape retention and stability, as well as excellent usability. [Modes for carrying out the invention]

[0013] The present invention will be described in detail below, but the present invention is not limited to the embodiments described herein.

[0014] The present invention relates to a water-in-oil emulsion cosmetic comprising the following components: (A) (a) a vegetable wax containing sunflower seed wax, (B) polyglycerin condensed ricinoleic acid ester, (C) polyglycerin diisostearate ester, and (D) a liquid hydrocarbon oil, wherein the content of component (A) in the cosmetic is 4 to 12% by mass, the content of component (a) in component (A) ((a) / (A)) is 40% by mass or more, the content of component (B) in the cosmetic is 0.5 to 4% by mass, the content of component (C) in the cosmetic is 0.5 to 3% by mass, and the content of component (D) in the cosmetic is 8 to 20% by mass.

[0015] Component (A) is a vegetable wax containing sunflower seed wax (component (a)). Here, vegetable wax refers to a solid oil derived from plants. A solid oil refers to an oil that is solid or paste-like at room temperature.

[0016] Component (A) must contain at least 40% by mass of sunflower seed wax (a) when the total mass of component (A) is taken as 100%. If the sunflower seed wax (a) content is less than 40% by mass, the shape retention of the cosmetic will be impaired. To obtain a cosmetic with superior shape retention, the content of component (a) in component (A) is preferably 45% by mass or more, and more preferably 50% by mass or more.

[0017] Component (A) may include plant-derived solid oils other than sunflower seed wax (a), as long as they are within the above range. Such plant-derived solid oils may be any that are commonly used in cosmetics, such as candelilla wax, candelilla wax hydrocarbons, carnauba wax, jojoba esters, rice bran wax, and hydrogenated castor oil. Component (A) may be any one of these, either alone or in combination of two or more, and when two or more are combined, the ratio may be arbitrary.

[0018] The content of component (A) in the solid water-in-oil emulsion cosmetic of the present invention is 4 to 12% by mass when the total mass of the solid water-in-oil emulsion cosmetic is taken as 100%. Within this range, a solid water-in-oil emulsion cosmetic with excellent shape retention and usability can be obtained. On the other hand, if the content of component (A) is less than 4% by mass, sufficient shape retention cannot be obtained. Also, if the content of component (A) exceeds 12% by mass, the cosmetic becomes too hard and does not spread well, resulting in reduced usability. To more reliably obtain a cosmetic with good shape retention and usability, the above mass ratio range is preferably 4 to 10% by mass, and more preferably 5 to 8% by mass.

[0019] Component (B) is a polyglycerol condensed ricinoleate ester. Examples of polyglycerol condensed ricinoleate esters that can be used as component (B) include polyglyceryl-3 polyricinoleate, polyglyceryl-4 polyricinoleate, and polyglyceryl-6 polyricinoleate, and any one or more of these can be used individually or in combination.

[0020] The polyglycerin condensed ricinoleate ester (B) that can be used in the present invention is commercially available, and commercially available products can also be used. For example, preferred commercially available products include IMWITOR600 (IOI Oleo GmbH), SY Glister CR-310 (Sakamoto Pharmaceutical Co., Ltd.), and NIKKOL Hexaglyn PR-15 (Nikko Chemicals Co., Ltd.).

[0021] The content of component (B) in the solid water-in-oil emulsified cosmetic of the present invention is 0.5 to 4% by mass, when the total mass of the solid water-in-oil emulsified cosmetic is taken as 100%. Within this range, a solid water-in-oil emulsified cosmetic excellent in quality and usability can be obtained. On the other hand, when the content of component (B) is less than 0.5% by mass, the emulsion stability is poor, and the quality of the cosmetic is impaired. In addition, when the content of component (B) exceeds 4% by mass, stickiness becomes strong and usability deteriorates. In order to more reliably obtain a cosmetic excellent in both quality and usability, the above range of the content by mass is preferably 0.8 to 3.5% by mass, more preferably 1 to 3% by mass.

[0022] Component (C) is polyglycerol diisostearate. Examples of polyglycerol diisostearate that can be used as component (C) include polyglyceryl-3 diisostearate, polyglyceryl-2 diisostearate, and the like. Any one selected from these may be used alone, or two or more thereof may be used in combination.

[0023] The polyglycerol diisostearate (C) that can be used in the present invention is commercially available, and commercially available products can also be used. For example, Risorex PGIS32 (Higher Alcohol Industry Co., Ltd.), Risorex PGIS22 (Higher Alcohol Industry Co., Ltd.) and the like can be mentioned as preferred commercially available products.

[0024] The content of component (C) in the solid water-in-oil emulsified cosmetic of the present invention is 0.5 to 3% by mass, when the total mass of the solid water-in-oil emulsified cosmetic is taken as 100%. Within this range, a solid water-in-oil emulsified cosmetic excellent in quality and usability can be obtained. On the other hand, when the content of component (C) is less than 0.5% by mass, the emulsion stability is poor, and the quality of the cosmetic is impaired. In addition, when the content of component (C) exceeds 3% by mass, stickiness becomes strong and usability deteriorates. In order to more reliably obtain a cosmetic excellent in both quality and usability, the above range of the content by mass is preferably 0.8 to 2.5% by mass, more preferably 1 to 2% by mass.

[0025] Component (D) is a liquid hydrocarbon oil. The liquid hydrocarbon oil refers to a hydrocarbon oil that is liquid at room temperature. Examples of liquid hydrocarbon oils that can be used as component (D) include liquid paraffin, squalane, hydrogenated polyisobutene, hydrogenated polydecene, isoparaffin, and olefin. Component (D) may be used alone, or any two or more selected from these may be used in combination.

[0026] In order to consider the impact on the environment, it is preferable to use a plant-derived liquid hydrocarbon oil as component (D). Specifically, for example, JEECHEM NDA-LC (JEEN International Corporation), Neossance Hemisqualane (Aprinnova, LLC), EMOGREEN L19 (SEPPIC S.A.), EMOGREEN L15 (SEPPIC S.A.), and Phytosqualane (SOPHIM) can be used.

[0027] The content of component (D) in the solid water-in-oil emulsified cosmetic of the present invention is 8 to 20% by mass, when the total mass of the solid water-in-oil emulsified cosmetic is taken as 100%. Within this range, a solid water-in-oil emulsified cosmetic excellent in quality and usability can be obtained. On the other hand, if the content of component (D) is less than 8% by mass, the emulsion stability is poor, and the quality of the cosmetic is impaired. In addition, if the content of component (D) exceeds 20% by mass, the cosmetic becomes oily and the usability deteriorates. In order to more reliably obtain a cosmetic with good both quality and usability, the above mass ratio range is preferably 8.5 to 18% by mass, more preferably 8.5 to 16% by mass.

[0028] In addition to the above components, the solid water-in-oil emulsion cosmetic composition of the present invention may appropriately incorporate components commonly used in cosmetics, such as liquid oils other than component (D) above, fats and oils, animal waxes, surfactants, water-soluble polymers, oil-soluble polymers, lower alcohols, water, preservatives, antioxidants, thickeners, pigments, pH adjusters, fragrances, dyes, pigments, pearlescent agents, UV absorbers, moisturizers, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin activators, etc., to the extent that they do not impair the effects of the present invention.

[0029] The solid water-in-oil emulsion cosmetic of the present invention can be manufactured by a conventional method for manufacturing solid water-in-oil emulsion cosmetics. Specifically, components (A) to (D) and other oily components are heated and mixed, then any powder component is dispersed, and finally the aqueous phase component is added and mixed. The resulting cosmetic can then be filled into a container and molded as needed.

[0030] The solid water-in-oil emulsion cosmetic composition of the present invention can be in the form of products such as foundation, blush, highlighter, eyeshadow, serum stick, and sunscreen.

[0031] The solid water-in-oil emulsion cosmetic composition of the present invention satisfies all requirements of shape retention, stability, and usability, even though it does not use synthetic or mineral hydrocarbon waxes as a solidifying agent and does not contain silicones or polyether-modified silicones, making it useful for providing cosmetics that comply with the SDGs. [Examples]

[0032] The present invention will be further explained below with reference to examples. However, these examples do not limit the present invention in any way.

[0033] <Examples 1-21 and Comparative Examples 1-11: Foundations> Foundations were prepared using the compositions shown in Tables 1-4 below and the manufacturing methods described below. The "shape retention," "stickiness," "moisture," and "long-term stability" were evaluated according to the evaluation methods and criteria described below, and the results are shown together in Tables 1-4. In the tables, the values ​​for each component are in mass percent.

[0034] [Table 1]

[0035] [Table 2]

[0036] [Table 3]

[0037] [Table 4]

[0038] *1: Refined sunflower wax (Yokozeki Oil & Fat Industry Co., Ltd.) *2: MWITOR600(IOI Oleo GmbH) *3: NIKKOL Hexaglyn PR-15 (Nikko Chemicals Co., Ltd.) *4: Risolex PGIS32 (Higher Alcohol Industry Co., Ltd.) *5: Risolex PGIS22 (Higher Alcohol Industry Co., Ltd.) *6: JEECHEM NDA-LC(JEEN International Corporation) *7: Neossance Hemisqualane (Aprinnova, LLC) *8: EMOGREEN L19 (SEPPIC SA) *9: Phytosqualane (SOPHIM)

[0039] [Manufacturing method] (A) to (D) and other oily components were heated to 90°C and mixed uniformly, then the powder components were added and uniformly dispersed. The aqueous phase components were then added and mixed to create a uniform emulsifier. After degassing, the mixture was filled into containers and cooled to obtain a solid water-in-oil emulsion cosmetic.

[0040] [Evaluation Methods and Criteria] i. Shape retention (Evaluation method) Each sample was evaluated by visual observation. (Evaluation Criteria) ◎: Excellent (Excellent solid state) ○: Slightly good (slightly good solid state) △: Inferior (paste-like to soft) ×: Extremely inferior (liquid)

[0041] ii. Stickiness (Evaluation method) A practical usability test was conducted by 10 expert panelists. Each sample was applied to the skin and scored based on the following criteria. The average score was used as the evaluation value and evaluated according to the following criteria. (Score) 5 points: Not sticky 4 points: Not too sticky 3 points: Normal stickiness 2 points: Slightly sticky 1 point: It's sticky. (Evaluation Criteria) ◎: Score (average) 4.0 or higher, 5.0 or lower ○: Score (average) 3.0 or higher, less than 4.0 points △: Score (average) between 2.0 and 3.0

[0042] iii. Freshness (Evaluation method) A practical usability test was conducted by 10 expert panelists. Each sample was applied to the skin and scored based on the following criteria. The average score was used as the evaluation value and evaluated according to the following criteria. (Score) 5 points: It is fresh and juicy. 4 points: Slightly juicy 3 points: The freshness is average. 2 points: It lacks a bit of freshness. 1 point: It lacks freshness. (Evaluation Criteria) ◎: Score (average) 4.0 or higher, 5.0 or lower ○: Score (average) 3.0 or higher, less than 4.0 points △: Score (average) between 2.0 and 3.0 ×: Score (average) 1.0 or higher but less than 2.0 points

[0043] iv. Stability over time (Evaluation method) Each sample was left to stand at room temperature or 40°C for one month, and the presence or absence of changes such as sweating was evaluated by visual observation. (Evaluation Criteria) ◎: There was no difference between the product stored at room temperature and the product stored at 40°C; neither product showed any change. ○: Slight changes are observed in products stored at 40℃, but there are no problems with usability. △: Clear changes were observed in the product stored at 40°C, making it unusable. ×: Changes were observed in both the items stored at room temperature and those stored at 40°C.

[0044] [result] As is clear from the results in Tables 1-4, Examples 1-21, which are embodiments of the present invention, were oil-based solid cosmetics that were excellent in all aspects of "shape retention," "stickiness," "moisture," and "stability over time." On the other hand, Comparative Examples 1 and 2, in which the content of component (A) in the cosmetic was outside the range of 4-12% by mass; Comparative Examples 3, 4, and 6, in which the content of component (B) in the cosmetic was outside the range of 0.5-4% by mass; Comparative Examples 3, 5-7, in which the content of component (C) in the cosmetic was outside the range of 0.5-3% by mass; Comparative Examples 8 and 9, in which the content of component (a) in component (A) ((a) / (A)) was less than 40% by mass, often had poor shape retention or stability over time. Even if shape retention or stability over time was satisfied, the usability was poor, and none of them were able to satisfy all requirements.

[0045] <Example of prescription: Whitening stick> Based on the above examples, the following shows an example of a whitening stick formulation that excels in shape retention, long-term stability, and usability, as well as a conventional formulation (including mineral hydrocarbon wax, silicone, and polyether-modified silicone) that has equivalent shape retention, long-term stability, and usability. In the table, the values ​​for each component are in mass percent. The evaluation method and judgment criteria are the same as above.

[0046] [Table 5]

Claims

1. The following ingredients: (A) (a) Vegetable wax containing sunflower seed wax, (B) Polyglycerol condensed ricinoleate ester, (C) Polyglycerin diisostearate, and (D) Liquid hydrocarbon oil A solid water-in-oil emulsion cosmetic comprising, The cosmetic composition contains 4 to 12% by mass of component (A), and the content of component (a) in component (A) ((a) / (A)) is 40% by mass or more. The content of component (B) in the aforementioned cosmetic composition is 0.5 to 4% by mass. The content of component (C) in the aforementioned cosmetic composition is 0.5 to 3% by mass, A solid water-in-oil emulsion cosmetic having a content of component (D) of 8 to 20% by mass.

2. The solid water-in-oil emulsion cosmetic according to claim 1, wherein the content of component (A) in the cosmetic is 4 to 10% by mass, and / or (a) / (A) is 45% by mass or more.

3. The water-in-oil emulsion cosmetic composition according to claim 1, wherein the content of component (B) in the cosmetic composition is 0.8 to 3.5% by mass.

4. The water-in-oil emulsion cosmetic composition according to claim 1, wherein the content of component (C) in the cosmetic composition is 0.8 to 2.5% by mass.

5. The water-in-oil emulsion cosmetic composition according to claim 1, wherein the content of component (D) in the cosmetic composition is 8.5 to 18% by mass.

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