Aqueous gel composition for cosmetics

Abstract

To provide an aqueous gel composition for cosmetics, which exhibits refreshing and non-sticky sensory feel characteristics necessary for preparing cosmetics that spread refreshingly and remains non-sticky after application.SOLUTION: An aqueous gel composition for cosmetic use comprises the following components (A) to (C) and satisfies the following conditions (i) to (iii): (A) a nonionic surfactant having an average number of moles of added polyoxyethylene groups of 10 or more and an HLB value of 10 to 18; (B) at least one selected from the group consisting of cyclodextrin and water-soluble derivatives thereof; (C) water; and (i) the total content (A)+(B) of component (A) and component (B) is 20 wt.% or less; (ii) the weight ratio (B) / (A) of component (B) to component (A) is 1 or more; and (iii) the weight ratio (B) / (C) of component (B) to component (C) is 0.15 or less.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an aqueous gel composition for cosmetics having a fresh and non-sticky feel property.

Background Art

[0002] Cosmetics that stretch smoothly and do not become sticky after application tend to be favored by consumers for their pleasant feel properties. Conventionally, technologies such as aqueous gels and oil-in-water emulsions have been used to obtain such cosmetics with feel properties.

[0003] On the other hand, it is generally known that the good feel and the stability of cosmetics are in a trade-off relationship. That is, pursuing a good feel causes a decrease in stability. In particular, in a thermodynamically unstable emulsion system, it is necessary to minimize the aggregation and coalescence of emulsion particles, which are the destabilizing factors.

[0004] In response to such problems, means have been taken to construct a three-dimensional molecular structure in the continuous phase and control the movement of emulsion particles. As an example, the use of an α-gel composition in oil-in-water emulsions has been conventionally studied (for example, Patent Documents 1 to 3).

[0005] In the above-mentioned α-gel composition, it is common to contain a surfactant, which is an amphiphilic molecule, and a higher alcohol, which is an oily component, as basic constituent components. However, higher alcohols have drawbacks such as enhancing the oily feeling and causing stickiness after application.

[0006] As an α-gel composition not containing a higher alcohol, Patent Document 4 discloses an α-gel structure containing a monoalkyl phosphate ester, a neutralizing agent, and water as essential components.

[0007] Cyclodextrin is a cyclic molecule with glucose as its basic unit, and it is known to form a pseudo-polyrotaxane in which polyethylene glycol, a linear molecule, is included in its hydrophobic internal pores (Non-Patent Document 1).

[0008] In recent years, hydrogels using polyrotaxanes having a structure in which a linear molecule having end-blocking groups penetrates a cyclic molecule have been studied (for example, Patent Documents 5 and 6). Patent Document 5 discloses a gel-like substance having a crosslinked polyrotaxane in which a first polyrotaxane and a second polyrotaxane are bonded via a chemical bond. Further, Patent Document 6 discloses a hydrogel containing a polyrotaxane and a chain-like water-soluble polysaccharide as essential components, and crosslinking these components by reversible covalent bonds. All of these inventions are characterized by forming a three-dimensional network structure by crosslinking between molecules.

[0009] The aqueous gel having a crosslinked structure using the above polyrotaxane has extremely high strength and does not undergo sol-gel transition, or a very large strain needs to be applied to transfer from the gel to the sol, and it was not satisfactory as a cosmetic aqueous gel that is required to transfer to the sol at a low strain.

[0010] Against such a background, there is a demand for a cosmetic aqueous gel-like composition having a fresh and non-sticky feel characteristic.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Non-Patent Documents

[0012]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0013] The present invention has been made in view of the above circumstances, and an object thereof is to provide an aqueous gel-like composition for cosmetics having a fresh and non-sticky feel characteristic.

Means for Solving the Problems

[0014] Under such circumstances, as a result of intensive studies to solve the above problems, the inventors of the present application have found that an aqueous gel-like composition for cosmetics containing the following components (A) to (C) and satisfying the following conditions (a) to (c) has a fresh and non-sticky feel characteristic, and have completed the present invention. Component (A): A nonionic surfactant having an average added mole number of 10 or more of polyoxyethylene groups and an HLB value of 10 or more and less than 18 Component (B): At least one selected from the group consisting of cyclodextrin and its water-soluble derivatives Component (C): Water Condition (a): The total content (A)+(B) of component (A) and component (B) is 20% by weight or less Condition (b): The weight ratio (B) / (A) of component (B) to component (A) is 1 or more Condition (c): The weight ratio (B) / (C) of component (B) to component (C) is 0.15 or less

Effects of the Invention

[0015] The present invention provides an aqueous gel composition for cosmetics, which contains, as essential components, a nonionic surfactant having an average added mole number of polyoxyethylene groups of 10 or more and an HLB value of 10 or more and less than 18, cyclodextrin and its water-soluble derivatives, and water.

[0016] According to the present invention, it is possible to provide an aqueous gel composition for cosmetics having a fresh and non-sticky tactile property.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0018] Hereinafter, the aqueous gel composition for cosmetics having a fresh and non-sticky tactile property of the present invention will be described based on its preferred embodiments. According to the present invention, without using a higher alcohol generally contained in a molecular assembly gel composition using a surfactant typified by an α-gel, it is possible to provide an aqueous gel composition for cosmetics having a fresh and non-sticky tactile property.

[0019] Component (A) contained in the aqueous gel composition for cosmetics of the present invention generally acts as an emulsifier and / or solubilizer. However, in the aqueous gel composition for cosmetics of the present invention, it forms a molecular aggregate by interacting with component (B) and gels a large amount of water. That is, considering the solubility in water and the interaction with component (B), a nonionic surfactant having an average added mole number of 10 or more and an HLB value of 10 or more and less than 18 can be preferably used. The HLB value described in the present specification is an index indicating the hydrophilic-lipophilic balance (Hydrophile-Lipophile Balance). Regarding its description, the numerical value described in the raw material catalog of the corresponding component was adopted. When there is no description in the raw material catalog, it is calculated based on the Griffin method defined by the following formula 1.

Number

[0020] Component (A) contained in the aqueous gel composition for cosmetics of the present invention is not particularly limited as long as it is usually used in cosmetics. For example, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid ester, polyoxyethylene sorbitol tetra fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene cholesteryl ether, polyoxyethylene phytosteryl ether, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene-methyl polysiloxane copolymer, etc. Among them, those having an average addition mole number of the polyoxyethylene group of 10 or more and an HLB value of 10 or more and less than 18 can be mentioned. Among these, polyoxyethylene phytosteryl ether, polyoxyethylene alkyl ether, and polyoxyethylene hydrogenated castor oil are preferable. Examples include PEG-10 phytosterol (NIKKOL BPS-10: average addition mole number of polyoxyethylene group is 10, HLB value is 12.5: manufactured by Nikko Chemicals Co., Ltd.), Steareth-20 (EMALEX 620: average addition mole number of polyoxyethylene group is 20, HLB value is 13.0: manufactured by Nippon Emulsion Co., Ltd.), and PEG-40 hydrogenated castor oil (NIKKOL HCO-40: average addition mole number of polyoxyethylene group is 40, HLB value is 12.5: manufactured by Nikko Chemicals Co., Ltd.). In addition, these nonionic surfactants having an average addition mole number of the polyoxyethylene group of 10 or more and an HLB value of 10 or more and less than 18 may be used alone or in combination of two or more.

[0021] The content of component (A) contained in the aqueous gel composition for cosmetics of the present invention is not particularly limited as long as the conditions (i) to (iii) of the present invention are satisfied, but it is 1 to 10% by weight. Preferably, it is 3 to 8% by weight. If it is less than 1% by weight, gel formation may not be sufficient, and if it is more than 10% by weight, it may affect the usability.

[0022] Component (B) contained in the aqueous gel composition for cosmetics of the present invention is not particularly limited as long as it is cyclodextrin and its water-soluble derivatives usually used in cosmetics. For example, generally used α-type, β-type, and γ-type cyclodextrins and their water-soluble derivatives can be mentioned. Examples of the water-soluble derivatives include hydroxyethyl cyclodextrin, hydroxypropyl cyclodextrin, glucosyl cyclodextrin, maltosyl cyclodextrin, carboxymethyl cyclodextrin, sulfoxyl cyclodextrin, sulfoethyl cyclodextrin, etc., but are not necessarily limited thereto. Further, these cyclodextrins and their water-soluble derivatives may be used alone or in combination of two or more.

[0023] In the aqueous gel composition for cosmetics of the present invention, it is important that a sufficient amount of cyclodextrin is dissolved in water. However, since β-cyclodextrin has extremely low water solubility, as component (B) of the present invention, it is more preferably selected from the group consisting of α-cyclodextrin and / or γ-cyclodextrin and their water-soluble derivatives. Most preferably, it is selected from the group consisting of α-cyclodextrin having an optimal pore size that effectively brings about an interaction with component (A) of the present invention and its water-soluble derivatives.

[0024] The content of component (B) contained in the aqueous gel composition for cosmetics of the present invention is not particularly limited as long as the conditions (i) to (iii) of the present invention are satisfied, but it is 1 to 12% by weight. Preferably it is 5 to 10% by weight. If it is less than 1% by weight, gel formation may not be sufficient, and if it is more than 12% by weight, it may affect the usability.

[0025] The content of component (C) contained in the aqueous gel composition for cosmetics of the present invention is not particularly limited, but it is 70 to 98% by weight. Preferably it is 80 to 92% by weight. If it is less than 70% by weight, it may affect the usability, and if it is more than 98% by weight, gel formation may not be sufficient.

[0026] In addition to the above components contained in the aqueous gel composition for cosmetics of the present invention, it may also contain powders generally used in cosmetics. For example, inorganic powders such as talc, sericite, mica, synthetic mica, silica, barium sulfate, alumina, boron nitride, titanium oxide, iron oxide, zinc oxide, and organic powders such as silk powder and crystalline cellulose powder can be mentioned, and one or more of these can be used.

[0027] In addition to the above components contained in the aqueous gel composition for cosmetics of the present invention, within a range that does not impair the effects of the invention, depending on the purpose of use, it may also contain other components generally used in cosmetics. For example, water retention agents, anionic surfactants, cationic surfactants, nonionic surfactants other than component (A) of the present invention, fragrances, medicinal components, cooling agents, ultraviolet absorbers, stabilizers, antioxidants, preservatives, pH adjusters, viscosity adjusters, beauty components, etc. can be mentioned.

[0028] However, among the above water retention agents, polyethylene glycol is preferably not contained because it is a factor that inhibits the gel formation of the present invention.

[0029] In the aqueous gel composition for cosmetics of the present invention, it may contain a higher alcohol, but it is possible to form a gel composition that particularly contains a large amount of water without containing it.

[0030] The aqueous gel composition for cosmetics of the present invention is characterized in that component (A) and component (B) form a pseudo-polyrotaxane to construct a three-dimensional molecular structure, and a large amount of component (C) is included therein.

[0031] In the aqueous gel composition for cosmetics of the present invention, it is not necessary to use a polyrotaxane with the ends of the above rotaxane structure blocked, and it exhibits gelation ability as a pseudo-polyrotaxane without blocking the ends.

[0032] The aqueous gel composition for cosmetics of the present invention is prepared by using an apparatus for manufacturing ordinary cosmetics and stirring and mixing the constituent components. Specifically, component (A) is added to a mixed solution of component (B) and component (C), and they are uniformly mixed while appropriately heating. After uniform mixing, the aqueous gel composition for cosmetics of the present invention is prepared by cooling to room temperature.

Examples

[0033] Hereinafter, the aqueous gel composition for cosmetics of the present invention will be described in more detail with reference to examples, but the technical scope of the present invention is not limited thereto. The numerical values in the tables represent the content (weight %). Also, the HLB values in the examples and comparative examples were referred to from the raw material brochures of each company (Product Profiles issued in December 2010 (Nikoh Chemicals Co., Ltd.), Japan Emulsion Product Catalog issued in May 2023 (Japan Emulsion Co., Ltd.)).

[0034] (Examples 1 to 17 and Comparative Examples 1 to 10) An aqueous gel composition for cosmetics was produced according to the formulations shown in Tables 1 to 3 below and the following preparation method. For each of the obtained samples, the presence or absence of gel formation and the freshness and non-stickiness as the feeling of use were evaluated by the following evaluation method, and these results are also shown in Tables 1 to 3.

[0035] (Preparation Method) Component (B) shown in Tables 1 to 3 was dissolved in component (C), then component (A) was weighed in, and after heating to 85°C, sufficient heating and stirring were applied until it became uniform, and then it was cooled to room temperature to obtain an aqueous gel composition for cosmetics.

[0036] (Gel Formation Evaluation Method) After preparing the compositions of the following examples and comparative examples, they were transferred to a transparent glass container with a lid and allowed to stand, and the appearance and fluidity when inverted were visually observed the next day. The gel formation was determined according to the following criteria. <Criteria> 〔Appearance and Fluidity〕 〔Determination〕 A uniform gel state that does not flow even when inverted: ◎ A uniform gel state that flows slightly when inverted: 〇 Partial gel state or uniform solution state: ×

[0037] (Method for evaluating usability) Ten cosmetic experts in their 20s to 40s evaluated the usability of the compositions of the following examples and comparative examples when directly applied to the back of the hand or the cheek. They evaluated the "freshness during application" and the "non-stickiness after application" respectively. Each person scored according to the following evaluation criteria, and the average score of each aqueous gel composition for cosmetics was calculated and judged according to the following judgment criteria. <Evaluation criteria> 〔Usability〕 〔Score〕 Very good: 5 Good: 4 Average: 3 Somewhat poor: 2 Poor: 1 <Judgment criteria> 〔Average score〕 〔Judgment〕 4.5 or more ◎ 3.5 or more and less than 4.5 ○ 2 or more and less than 3.5 △ Less than 2 ×

[0038]

Table 1

[0039] From the results in Table 1, aqueous gel-like cosmetic compositions excellent in gel-forming property and usability were obtained in Examples 1 to 10. Further, regarding the aqueous gel-like cosmetic compositions of Examples 1 to 3, 5, 6, and 9 which were within the most preferable content ranges of components (A) and (B), they were particularly excellent in gel-forming property and usability. On the other hand, in Comparative Example 1 which did not contain component (A) and Comparative Example 2 which did not contain component (B), gels could not be formed. Also, Comparative Examples 3 and 4 where the weight ratio (B) / (A) of component (B) to component (A) was outside the specific numerical range of the present invention could not form gels either. Further, in Comparative Example 5 where the total content (A)+(B) of component (A) and component (B) was outside the specific numerical range of the present invention, gels were formed but the usability was poor. Similarly, in Comparative Example 6 where the weight ratio (B) / (C) of component (B) to component (C) was outside the specific numerical range of the present invention, gels were formed but the usability was poor.

[0040] As an example of an aqueous gel-like cosmetic composition excellent in gel-forming property and usability, the optical microscope image and the polarized light microscope image under crossed nicols of the aqueous gel-like cosmetic composition obtained in Example 2 are shown in FIGS. 1 and 2, respectively.

[0041]

Table 2

[0042] From the results in Table 2, even in Examples 11 to 14, a cosmetic aqueous gel composition excellent in gel-forming property and usability was obtained. On the other hand, in Comparative Example 7 using PEG-30 phytosterol whose HLB value was outside the specific numerical range of the present invention, the result was inferior in gel-forming property. Also, in Comparative Examples 8 and 9 using Steareth-5 and PEG-5 hydrogenated castor oil whose average number of moles of added polyoxyethylene groups and HLB value were outside the specific numerical range of the present invention, gels could not be formed. Furthermore, in Comparative Example 10 using polyglyceryl-10 isostearate having no polyoxyethylene group, gels could not be formed.

[0043]

Table 3

[0044] From the results in Table 3, even in Examples 15 to 17, a cosmetic aqueous gel composition excellent in gel-forming property and usability was obtained. Here, when comparing Example 15 and Example 16, the cosmetic aqueous gel composition containing α-cyclodextrin as component (B) in Example 15 was superior in gel-forming property to the composition in Example 16 containing a β-cyclodextrin derivative. Similarly, when comparing Example 15 and Example 17, the cosmetic aqueous gel composition containing α-cyclodextrin in Example 15 was superior in gel-forming property to the composition in Example 17 containing γ-cyclodextrin.

Industrial Applicability

[0045] The present invention provides an aqueous gel composition for cosmetics, which contains, as essential components, a nonionic surfactant having an average added mole number of polyoxyethylene groups of 10 or more and an HLB value of 10 or more and less than 18, cyclodextrin and its water-soluble derivatives, and water. According to the present invention, it is possible to provide an aqueous gel composition for cosmetics having a fresh and non-sticky tactile property.

Claims

1. An aqueous gel composition for cosmetics, characterized by containing the following components (A) to (C) and satisfying the following conditions (a) to (c). Component (A): A nonionic surfactant having an average added mole number of 10 or more of polyoxyethylene groups and an HLB value of 10 or more and less than 18 Component (B): At least one selected from the group consisting of cyclodextrin and its water-soluble derivatives Component (C): Water Condition (a): The total content (A) + (B) of component (A) and component (B) is 20% by weight or less Condition (b): The weight ratio (B) / (A) of component (B) to component (A) is 1 or more Condition (c): The weight ratio (B) / (C) of component (B) to component (C) is 0.15 or less

2. The aqueous gel composition for cosmetics according to claim 1, wherein component (A) is at least one selected from polyoxyethylene phytosteryl ether, polyoxyethylene alkyl ether, and polyoxyethylene hydrogenated castor oil.

3. The aqueous gel composition for cosmetics according to claim 1 or 2, wherein component (B) is α-cyclodextrin and its water-soluble derivatives.

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