JP7634857B2 - Water-based cleansing cosmetics - Google Patents

Description

The present invention relates to an aqueous cleansing cosmetic.

In the cosmetics field, cleansing cosmetics for removing makeup come in various formulations, such as oils, lotions, and creams, each of which is used according to its intended purpose.

Cleansing creams and cleansing oils, which have an oily continuous phase, blend well with makeup and have excellent cleansing properties, but cleansing creams can leave an oily feeling, necessitating the need to wash the face, while cleansing oils can remove too much oil, causing irritation to the skin.

On the other hand, lotion-type products that do not contain oil or contain only a small amount of oil are in demand because they have a less oily feel, are comfortable to use, and are less irritating to the skin. Lotion-type cleansers contain a nonionic surfactant as the main ingredient for safety reasons, but in order to achieve a high makeup removal effect, it was necessary to contain a large amount of polyoxyethylene-based surfactant (see, for example, Patent Document 1). In addition, when reducing the amount of surfactant, it was necessary to contain a large amount of polyoxyethylene-based compound (see, for example, Patent Document 2). However, cleansing cosmetics that contain a large amount of polyoxyethylene-based surfactants or polyoxyethylene-based compounds have the problem of causing skin creaking after wiping.

JP 2016-003218 A JP 2017-178868 A

The problem that the present invention aims to solve is to provide an aqueous cleansing cosmetic that blends well with makeup, has excellent makeup removal effects, and does not leave a rough feeling on the skin after wiping.

As a result of intensive research into solving the above problems, the inventors discovered that an aqueous cleansing cosmetic composition consisting of a polyglycerol fatty acid ester with an HLB of 12.5 to 16, a polyglycerol fatty acid ester with an HLB of 10 to 12, an alkanediol having 5 or more carbon atoms, and a dihydric alcohol having an ether bond has excellent cleansing performance and can solve the above problems, which led to the completion of the present invention.

In other words, the present invention makes it possible to develop an aqueous cleansing cosmetic that has excellent cleansing power and does not leave a squeaky feeling after use by blending a specific polyglycerol fatty acid ester in combination with a specific alkanediol and polyhydric alcohol into an aqueous cleansing cosmetic.

The following describes in detail the embodiments of the present invention. Note that the notation "~" indicating a range includes the upper and lower limits.

The present invention contains (A) a polyglycerol fatty acid ester having an HLB of 12.5 to 16, and (B) a polyglycerol fatty acid ester having an HLB of 10 to 12.

There are no particular limitations on the method for producing polyglycerin, which is the raw material for polyglycerol fatty acid esters, but examples include the conventional method for producing polyglycerin by heating glycerin in the presence of an alkali catalyst under normal or reduced pressure.

The average degree of polymerization of polyglycerol is preferably 2 to 20, and more preferably 6 to 10.

The average degree of polymerization of polyglycerol is calculated from the hydroxyl value according to the following formula (i): The hydroxyl value in formula (i) is measured in accordance with the "Standard Methods for the Analysis of Fats, Oils and Related Compounds, 2013 Edition" (established by the Japan Oil Chemists' Society).
Average degree of polymerization=(112220−18×hydroxyl value)/(74×hydroxyl value−56110) (i)

The HLB of components (A) and (B) is calculated by the following formula (ii).
HLB value=20×(1−S/A) (ii)
[S: saponification value of ester, A: acid value of fatty acid]

The polyglycerol fatty acid ester of component (A) used in the present invention has an HLB of 12.5 to 16. The constituent fatty acid is not particularly limited, but usually a saturated or unsaturated fatty acid having 8 to 24 carbon atoms is used. The fatty acid may be a mixture, and a saturated or unsaturated fatty acid having 12 to 18 carbon atoms is preferred. Specific examples include polyglyceryl-6 laurate, polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 isostearate, and polyglyceryl-10 oleate. Among these, polyglyceryl-10 laurate, polyglyceryl-10 isostearate, and polyglyceryl-10 oleate are preferred.

The content of component (A) in the aqueous cleansing cosmetic is preferably 1% by mass or more and 20% by mass or less, and more preferably 3% by mass or more and 15% by mass or less. When the content of component (A) is 1% by mass or more and 20% by mass or less, the cosmetic blends more easily with makeup.

The polyglycerol fatty acid ester of component (B) used in the present invention has an HLB of 10 to 12. The constituent fatty acid is not particularly limited, but usually a saturated or unsaturated fatty acid having 8 to 24 carbon atoms is used. The fatty acid may be a mixture, and a saturated or unsaturated fatty acid having 12 to 18 carbon atoms is preferred. Specific examples include polyglyceryl-4 laurate, polyglyceryl-6 stearate, polyglyceryl-10 distearate, polyglyceryl-10 tristearate, polyglyceryl-6 isostearate, polyglyceryl-10 diisostearate, and polyglyceryl-6 oleate. Of these, polyglyceryl-6 isostearate is preferred.

The content of component (B) in the aqueous cleansing cosmetic is preferably 0.5% by mass or more and 5% by mass or less, and more preferably 1% by mass or more and 3% by mass or less. When the content of component (B) is 0.5% by mass or more and 5% by mass or less, the cosmetic is more excellent in makeup removal.

The aqueous cleansing cosmetic composition of the present invention contains component (C) an alkanediol having 5 or more carbon atoms and (D) a dihydric alcohol having an ether bond, in order to further enhance the cleansing power.

Component (C) preferably has 5 to 8 carbon atoms, such as pentylene glycol, hexylene glycol, and caprylyl glycol. Of these, pentylene glycol is preferred.

The content of component (C) in the aqueous cleansing cosmetic is preferably 3% by mass or more and 10% by mass or less. When the content of component (C) is 3% by mass or more and 10% by mass or less, the cosmetic blends more easily with makeup.

Examples of component (D) include dipropylene glycol and ethylhexylglycerin. Of these, dipropylene glycol is preferred.

The content of component (D) in the aqueous cleansing cosmetic is preferably 1% by mass or more and 10% by mass or less. When the content of component (D) is 1% by mass or more and 10% by mass or less, the makeup removal effect is even better.

The cleansing cosmetic of the present invention can contain, as appropriate, ingredients used in ordinary cleansing cosmetics, within the scope that does not impair the effects of the invention, such as oils such as squalane, liquid paraffin, isopropyl myristate, isononyl isononanoate, cetyl octanoate, glyceryl triethylhexanoate, jojoba oil, and olive oil, water-soluble polymers such as hydroxyethyl cellulose and carboxyvinyl polymer, various vitamins, amino acids, herbal medicines, anti-inflammatory agents, cell activators, pigments, preservatives, and fragrances.

The aqueous cleansing cosmetic composition of the present invention preferably does not contain oil or contains 15% or less of oil.

The aqueous cleansing cosmetic composition of the present invention can be applied in any formulation, such as liquid, gel, or sheet in which a nonwoven fabric or the like is impregnated, or in combination with a propellant, such as an aerosol spray or aerosol foam, depending on the intended use, method, and environment of use. The same goes for the container form, which is not particularly limited and can be applied to a variety of containers, such as bottles, bottles with dispensers, pump foamers, jars, tubes, sprays, aerosol cans, bags filled with sheets, boxes, and the like.

The method for preparing the aqueous cleansing cosmetic of the present invention is not particularly limited. The present invention will be explained in more detail below with reference to examples and comparative examples, but the scope of the present invention is not limited to these examples.

<Examples 1 to 19, Comparative Examples 1 to 9>
The components shown in Tables 1 and 2 were dissolved at 70°C in the compositions shown in the tables, and then cooled to room temperature to produce aqueous cleansing cosmetics. Using the aqueous cleansing cosmetics obtained, sensory tests were carried out for usability. Evaluation items included "makeup compatibility,""makeupremoval," and "absence of squeaking after wiping," and were rated on a four-point scale.

[Makeup blends in well]
A sensory evaluation was conducted by 20 healthy female panelists. The lipstick was applied to the forearm, left for 10 minutes, and then the aqueous cleansing cosmetic was applied to the same area. The compatibility of the cleansing cosmetic and the lipstick was calculated as an average score out of 5 points, and evaluated according to the following criteria. The results are shown in Tables 1 and 2.
(standard)
◎: 4.0 points or more (good for makeup)
○: 3.0 points or more, less than 4.0 points (blends well with makeup)
△: 2.0 points or more, less than 3.0 points (slightly poor makeup compatibility)
×: 2.0 points or less (poor makeup compatibility)

[Makeup removal]
A sensory evaluation was conducted by 20 healthy female panelists. Lipstick was applied to the forearm, left for 10 minutes, and then an aqueous cleansing cosmetic was applied to the applied area, blended, and then blotted with cotton. The absence of makeup residue on the area blotted with cotton was calculated as an average score out of 5, and evaluated according to the following criteria. The results are shown in Tables 1 and 2.
(standard)
◎: 4.0 points or more (very good makeup removal)
○: 3.0 points or more and less than 4.0 points (good makeup removal)
△: 2.0 points or more, less than 3.0 points (slight makeup remains)
×: 2.0 points or less (makeup remains)

[No squeaking after wiping]
A sensory evaluation was conducted by 20 healthy female panelists. The lipstick was applied to the forearm, left for 10 minutes, and then the aqueous cleansing cosmetic was applied to the applied area, allowed to blend, and then blotted with cotton. The absence of squeaking on the skin after removing the cleansing cosmetic was calculated as an average score out of 5, and evaluated according to the following criteria. The results are shown in Tables 1 and 2.
(standard)
◎: 4.0 points or more (no creaking, very good usability)
○: 3.0 points or more, less than 4.0 points (little creaking, good usability)
△: 2.0 points or more, less than 3.0 points (slightly creaky, slightly poor usability)
×: 2.0 points or less (creaking, poor usability)

*1: S Face 10G-L (manufactured by Sakamoto Pharmaceutical Co., Ltd.)
*2: S-Face IS-1001P (manufactured by Sakamoto Pharmaceutical Co., Ltd.)
*3: SY Glister MO-7S (manufactured by Sakamoto Pharmaceutical Co., Ltd.)
*4: S-Face IS-601P (manufactured by Sakamoto Pharmaceutical Industries)

Examples 1 to 19, which used polyglycerol fatty acid esters with an HLB of 12.5 to 16, polyglycerol fatty acid esters with an HLB of 10 to 12, alkanediols with 5 or more carbon atoms, and dihydric alcohols with ether bonds, were superior in terms of makeup blending, makeup removal, and lack of squeaky feeling after wiping, compared to Comparative Example 1, which used only component (A), Comparative Examples 2 to 5, which did not contain any of the components, Comparative Example 6, which used an alkanediol with 4 or less carbon atoms, Comparative Example 7, which used diglycerol, a tetrahydric alcohol, and Comparative Examples 8 and 9, which did not use polyglycerol fatty acid esters in components (A) and (B).

Claims (1)

(A) a polyglycerol fatty acid ester having an HLB of 12.5 to 16;
(B) a polyglycerol fatty acid ester having an HLB of 10 to 12;
(C) an alkanediol having 5 or more carbon atoms,
(D) a dihydric alcohol having an ether bond,
(E) An aqueous cleansing cosmetic preparation containing water.