JP2022095034A - Oil-in-water type emulsion cosmetic - Google Patents

Abstract

To provide an oil-in-water type emulsion cosmetic that has quick phase inversion in massaging and satisfactory stability over days.SOLUTION: An oil-in-water type emulsion cosmetic contains the following components (A) to (C): (A) hydrocarbon oil that is liquid at 25°C by 10 to 80% in the total mass; (B) one kind or more selected from a group consisting of carboxyvinyl polymer and alkyl modified carboxyvinyl polymer by 1.0% or more in the total mass; and (C) nonionic surface active agent containing the following components C1) and (C2) which are (C1) one kind or more selected from polyoxyethylene mono fatty acid ester, fatty acid polyoxyethylene glyceryl, mono fatty acid polyoxyethylene glycerol and alkyl glucoside, and (C2) polyoxyethylene alkyl ether with HLB of 7 or more.SELECTED DRAWING: None

Description

The present invention relates to an oil-in-water emulsified cosmetic having a rapid phase change during massage and good aging stability.

As a cleansing cosmetic for removing sebum stains and makeup cosmetics on the skin, milk type, cream type, gel type, lotion containing no oil component or a small amount of oil component emulsified with a surfactant. Various cleaning agents have been developed, such as types and oil types containing liquid oil as the main component.

The O / W emulsified cream type, which contains a relatively large amount of oil component, has a phase-changing feeling when used (after applying to the skin, it has a fresh feel when it is applied and spread, and when it is continued to be applied, emulsified drops appear. It is characteristic that you can get a feeling that changes the load of massage by breaking and spreading the oily component on the skin. In addition, by changing the phase during use, it exerts a high cleansing effect on skin stains and oily stains such as make-up cosmetics.

Various studies have been made on this type of cleansing cosmetics in order to control the time until the phase change. For example, Patent Document 1 describes a combination of a specific block-type alkylene oxide derivative and a random-type alkylene oxide derivative, and Patent Document 2 describes a sorbitan-based nonionic surfactant and an N-acylamino acid-type surfactant. , Liquid oil, dipentaerythritol and an ester of hydroxy fatty acid or polyhydroxy fatty acid have been proposed to provide an oil-in-water cleaning agent that easily undergoes phase inversion and has high cleansing power.

Further, Patent Document 3 proposes a combination of an alkyl glucoside, a monohydric polyhydric alcohol, and a liquid oil with fatty acid soap to improve the speed of phase inversion during massage.

Patent Document 4 describes an anionic surfactant and / or a nonionic surfactant having an HLB of 10 or more, a specific branched saturated fatty acid ester, an ester selected from glycerin, sorbitan, and diglycerin, and a fatty acid having 8 to 22 carbon atoms. By combining them, we are proposing cosmetics with excellent massage properties that give an appropriate amount of time until the phase change.

However, the phase inversion phenomenon in the oil-in-water cleansing cream has not been sufficiently investigated so far, and it has been difficult to achieve the quality required by consumers.

In addition, emulsified cleansing cosmetics, which are quickly familiar with make-up cosmetics, tend to have poor stability over time because they tend to change phase.

Japanese Patent No. 5175645 Japanese Patent No. 6130121 Japanese Unexamined Patent Publication No. 2014-43398 Japanese Patent No. 6585362

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an oil-in-water emulsified cosmetic having a rapid phase change during massage and good circadian stability.

As a result of diligent research to achieve the above objectives, oil-in-water emulsified cosmetics containing liquid hydrocarbon oils, carboxyvinyl polymers and / or alkyl-modified carboxyvinyl polymers, and two specific nonionic surfactants have been found. We have found that the above problems can be solved, and have completed the present invention.

That is, the present invention provides an oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) 10 to 80% of the total mass of liquid hydrocarbon oil at 25 ° C.
(B) One or more selected from the group consisting of a carboxyvinyl polymer and an alkyl-modified carboxyvinyl polymer 1.0% or more in the total mass (C) Nonionic surfactant containing the following components (C1) and (C2) Activator (C1) One or more selected from polyoxyethylene monofatty acid ester, fatty acid polyoxyethylene glyceryl, monofatty acid polyoxyethylene glycerin and alkyl glucoside (C2) Polyoxyethylene alkyl ether with HLB of 7 or more

Further, an oil-in-water emulsified cosmetic containing the following component (D) is provided.
(D) One or more selected from the group consisting of trihydric or higher polyhydric alcohols and polysaccharides

The oil-in-water emulsified cosmetic of the present invention has a rapid phase inversion during massage, good aging stability, and further high cleansing power.

Hereinafter, the configuration of the present invention will be described in detail.

In the present invention, fast phase inversion during massage means that the emulsion composition is inverted on the skin by applying the preparation to the skin and massaging it, and the emulsion changes from an oil-in-water emulsion to a water-in-oil emulsion. It means that it takes a short time for the spread to become very light. In addition, good stability over time means that oil floating and separation over time are not observed, and the formulation is uniform.

<Ingredient (A)>
The component (A) used in the present invention is a hydrocarbon oil that is liquid at 25 ° C. By blending the component (A), the removal effect of make-up cosmetics and the storage stability can be improved.

Specific examples of the component (A) include α-olefin oligomer, liquid paraffin, liquid isoparaffin, squalane, polybutene, hydrogenated polybutene, and volatile isoparaffin. Any of these liquid hydrocarbon oils can be used alone or in combination of two or more.

The content of the component (A) in the oil-in-water emulsified cosmetic of the present invention is 10 to 80% by mass, preferably 20 to 70% by mass in the total mass. When it is 10% by mass or more, the speed of phase inversion during massage is good, and when it is 80% by mass or less, both the storage stability and the speed of phase inversion during massage are good.

<Ingredient (B)>
The component (B) used in the present invention is one or more selected from the group consisting of a carboxyvinyl polymer and an alkyl-modified carboxyvinyl polymer. By blending the component (B), the stability of the pharmaceutical product can be enhanced and the feel can be improved.

The carboxyvinyl polymer used as the component (B) is a water-soluble vinyl polymer having a carboxyl group, and examples thereof include polyacrylic acid. Specifically, Carbopole 940, Carbopole 941, Carbopole 980, Carbopole 981 (above, Lubrizol Advanced Materials, Inc.), Syntalen (Wako Pure Chemical Industries, Ltd.), AQUAPEC HV-501E (Sumitomo Seika). Commercial products such as (Co., Ltd.) can be used.

The alkyl-modified carboxyvinyl polymer used as the component (B) is a copolymer of acrylic acid and alkyl methacrylate. For example, commercially available products such as PEMULEN TR-1 and PEMUREN TR-2 (all manufactured by Lubrizol Advanced Materials, Inc.) can be used.

The content of the component (B) in the oil-in-water emulsified cosmetic of the present invention is 1.0% by mass or more in the total mass. Further, it is preferably 30% by mass or less. When it is 1.0% by mass or more, the storage stability and the speed of phase inversion of massage are good, and the usability without dripping of the cosmetic when applying the oil-in-water emulsified cosmetic to the skin. Is also good. When the content is 30% by mass or less, the pharmaceutical product does not spread poorly or become sticky, and no deterioration in usability is observed.

<Ingredient (C)>
The component (C) used in the present invention is a nonionic surfactant in which the following components (C1) and (C2) are combined.

<(C1) component>
The component (C1) is one or more nonionic surfactants selected from polyoxyethylene monofatty acid ester, fatty acid polyoxyethylene glyceryl, monofatty acid polyoxyethylene glycerin and alkyl glucoside. By blending the component (C1), the storage stability of the cleansing cosmetic is enhanced, and an excellent cleansing effect is imparted.

Saturated fatty acid or unsaturated fatty acid can be used as the fatty acid constituting the polyoxyethylene monofatty acid ester, fatty acid polyoxyethylene glyceryl, monofatty acid polyoxyethylene glycerin and alkyl glucoside, and a plurality of types of fatty acids are mixed. It may be used, or a fatty acid mixture such as saturated synthetic fatty acid, naturally derived animal fatty acid, and vegetable fat-derived fatty acid may be used.

The carbon number of such fatty acid is preferably 12 or more, more preferably 14 or more, and preferably 22 or less, more preferably 18 or less, from the viewpoint of low irritation when applied to the skin and high safety. Is. For example, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, behenic acid and the like can be mentioned, and one or more of these can be used.

Polyoxyethylene monofatty acid ester, fatty acid polyoxyethylene glyceryl, monofatty acid polyoxyethylene glycerin and alkyl glucoside are preferably fatty acid polyoxyethylene glyceryl from the viewpoint of improving aging stability, cleansing power and make-up familiarity, and stearic acid is preferable. The fatty acid polyoxyethylene glyceryl is more preferable, and the polyoxyethylene glyceryl triisostearate is more preferable.

Examples of commercially available products include "Emarex GWIS-310" and "Emarex GWIS-320" (all manufactured by Nippon Emulsion Co., Ltd.).

<(C2) component>
The component (C2) is a polyoxyethylene alkyl ether, and the HLB of this component as a whole is 7 or more. By blending the component (C2) in combination with the component (C1), the storage stability and the cleansing effect can be synergistically improved.

Here, when the HLB of this component as a whole is 7 or more, when one kind of nonionic surfactant selected from polyoxyethylene alkyl ether is used as the (C2) component, the one kind of nonionic surfactant is used. When the HLB value of the activator is 7 or more and two or more nonionic surfactants selected from the polyoxyethylene alkyl ether are used, the mixed HLB of the two or more nonionic surfactants is 7 or more. It means that there is.

The HLB (mixed HLB) of the component (C2) is preferably 9 or more, more preferably 10 or more, still more preferably 11.5 or more, and further preferably 11.5 or more, from the viewpoint of improving storage stability and improving cleansing power. It is preferably 18 or less, more preferably 17 or less, and even more preferably 15 or less.

In the present invention, the HLB (hydrophilic / lipophilic balance) is calculated by the Griffin formula (J, Soc, Cosmet, Chem., 1,311 (1949); 5,249 (1953)). Is. The HLB value of a mixed surfactant composed of two or more nonionic surfactants (hereinafter referred to as mixed HLB) is a weighted average of the HLB values of each nonionic surfactant based on the blending ratio. , It is calculated by the following equation.
Mixed HLB value = Σ (HLBx × Wx) / ΣWx
(HLBx indicates the HLB value of the surfactant X. Wx indicates the mass (g) of the surfactant X having the value of HLBx.)

The number of carbon atoms of the alkyl group of the polyoxyethylene alkyl ether is preferably 12 or more, more preferably 14 or more, further preferably 16 or more, and 22 or less, from the viewpoint of improving storage stability and improving cleansing power. It is preferable, 20 or less is more preferable, and 18 or less is further preferable. From the same viewpoint, the number of moles of oxyethylene added is preferably 2 or more, more preferably 5 or more, more preferably 40 or less, more preferably 30 or less, still more preferably 20 or less.

Specifically, polyoxyethylene (2EO) lauryl ether (HLB: 9.5), polyoxyethylene (4EO) lauryl ether (HLB: 11.5), polyoxyethylene (9EO). .) Lauryl ether (HLB: 14.5), polyoxyethylene (2EO) cetyl ether (HLB: 8.0), polyoxyethylene (6EO) cetyl ether (HLB: 10.5), Polyoxyethylene (7EO) cetyl ether (HLB: 11.5), polyoxyethylene (10EO) cetyl ether (HLB: 13.5), polyoxyethylene (15EO) cetyl ether (15EO) HLB: 15.5), polyoxyethylene (20EO) cetyl ether (HLB: 17.0), polyoxyethylene (2EO) stearyl ether (HLB: 8.0), polyoxyethylene (4E) O.) Stearyl ether (HLB: 9.0), Polyoxyethylene (20EO) Stearyl ether (HLB: 18.0), Polyoxyethylene (5EO) Behenyl ether (HLB: 7.0) ), Polyoxyethylene (10EO) behenyl ether (HLB: 10.0), polyoxyethylene (20EO) behenyl ether (HLB: 16.5), polyoxyethylene (30EO) behenyl Ether (HLB: 18.0) and the like can be more preferably exemplified. These can be used alone or in combination of two or more.

Of these, from the above viewpoint, polyoxyethylene (2EO) cetyl ether, polyoxyethylene (6EO) cetyl ether, polyoxyethylene (7EO) cetyl ether, polyoxyethylene (10E). O.) Cetyl ether, polyoxyethylene (15EO) cetyl ether, polyoxyethylene (20EO) cetyl ether, polyoxyethylene (2EO) stearyl ether, polyoxyethylene (4EO) .) One or more selected from stearyl ether and polyoxyethylene (20EO) stearyl ether is preferred, polyoxyethylene (2EO) cetyl ether, polyoxyethylene (6EO). Cetyl ether, polyoxyethylene (7EO) cetyl ether, polyoxyethylene (10EO) cetyl ether, polyoxyethylene (15EO) cetyl ether and polyoxyethylene (20EO) cetyl ether One or more selected from the above is more preferable.

Commercially available products include "NIKKOL BC-2", "NIKKOL BC-10TX", "NIKKOL BC-15TX", "NIKKOL BC-5", and "NIKKOL".
Examples include "BC-20TX" and "NIKKOL BC-30TX" (all manufactured by Nikko Chemicals Co., Ltd.).

The blending amount of the components (C1) and (C2) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, but preferably, the component (C1) is 0.005 to 15% by mass in the total mass, and the component (C2) is used. Is 0.05 to 15% by mass.

<(D) component>
The component (D) used in the present invention is one or more selected from the group consisting of trihydric or higher polyhydric alcohols and polysaccharides. By blending the component (D), it is possible to give a smooth feel when the preparation is applied, further enhance the massage property of the preparation, and improve the stability over time.

The blending amount of the component (D) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, but is preferably 3% by mass or more.

<Water>
Water is used to form the aqueous phase and maintain the system in the oil-in-water emulsified cosmetics of the present invention. The water content in the oil-in-water emulsified cosmetic of the present invention is preferably 5% by mass or more, more preferably 10% by mass or more, from the viewpoint of improving storage stability and obtaining a refreshing feel after use. It is more preferably 15% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, still more preferably 40% by mass or less, still more preferably 30% by mass or less.

In the oil-in-water emulsified cosmetic of the present invention, in addition to the above-mentioned essential ingredients, any commonly used ingredient can be used, if necessary, as long as the effect of the present invention is not impaired. These components include anionic surfactants, cationic surfactants, nonionic surfactants, oils, UV absorbers, preservatives, moisturizers, polymers, amino acid derivatives, sugar derivatives, fragrances, water, etc. Examples thereof include alcohols, thickeners, coloring agents, metal ion blocking agents, antioxidants, chemicals, and fragrances.

Next, the present invention will be described in detail based on examples, but the present invention is not limited thereto. Prior to the examples, the test method and the evaluation method adopted in each example will be described.

<Speed of phase change during massage, cleansing power test>
A panel of 10 professionals applied commercially available powder foundation, mascara, and lipstick to the face and let it dry for about 4 hours. Next, about 1.2 g of the composition was taken, spread over the entire face while looking in the mirror, blended with make-up, and then rinsed with water. Then, the speed of phase inversion during massage and the cleansing power were evaluated by a relative evaluation with the target product (in-house cleansing cream product (Z)) as 3 points, and the average score was used for the evaluation.

(Evaluation criteria) Speed of phase change during massage 5 points: Very good 4 points: Good 3 points: Somewhat good 2 points: Bad 1 point: Very bad

(Evaluation criteria) Cleansing ability 5 points: Very good 4 points: Good 3 points: Somewhat good 2 points: Bad 1 point: Very bad

<Storage stability evaluation test>
The sample was placed in a 50 mL transparent glass container, sealed, stored in a constant temperature bath at 45 ° C. for 3 months, and evaluated according to the following criteria by visual judgment.

(Evaluation criteria)
5 points: No change in sample appearance is observed 4 points: Very slight oil floating is observed on the sample surface 3 points: Clear oil floating or partial separation is observed on the sample surface 2 points: Separation is observed on the entire sample 1 point observed: Separation is observed immediately after preparation

Examples 1 to 30, Comparative Examples 1 to 8
The oil-in-water emulsified cosmetics of the formulations shown in Tables 1 to 3 were prepared according to a conventional method, and each of the above tests was carried out. The results are also shown in Tables 1 to 3.

As is clear from Tables 1 to 3, the oil-in-water emulsified cosmetics of the examples using the ingredients of the present invention all had excellent performance. On the other hand, in the comparative example, the speed of phase inversion during massage, cleansing force, and circadian stability were inferior, and the object of the present invention could not be achieved.

Table 4 shows the results of comparative evaluation of the current commercial product and the product according to the present invention. Compared with the current commercially available product, the product of the present invention can achieve both storage stability and speed of phase inversion during massage.

Claims (2)

An oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) 10 to 80% of the total mass of liquid hydrocarbon oil at 25 ° C.
(B) One or more selected from the group consisting of a carboxyvinyl polymer and an alkyl-modified carboxyvinyl polymer 1.0% or more in the total mass (C) Nonionic surfactant containing the following components (C1) and (C2) Activator (C1) One or more selected from polyoxyethylene monofatty acid ester, fatty acid polyoxyethylene glyceryl, monofatty acid polyoxyethylene glycerin and alkyl glucoside (C2) Polyoxyethylene alkyl ether with HLB of 7 or more The oil-in-water emulsified cosmetic according to claim 1, further containing the following component (D).
(D) One or more selected from the group consisting of trihydric or higher polyhydric alcohols and polysaccharides