JP2007176864A - Aqueous liquid skin cleanser - Google Patents

Abstract

［式中、Ｒ^１は平均炭素数１０〜１４のアルキル基を示し、Ｘ^１及びＸ^２はそれぞれ水素原子又はアルカリ金属を示し、ｎはエチレンオキサイドの平均付加モル数で、０〜２の数を示す。］
（Ｂ）２−エチルヘキシルグリセリルエーテル
【選択図】なし
The present invention provides an aqueous liquid skin cleanser excellent in the action of removing excess stratum corneum.
The following components (A) and (B) are contained, the content of the component (A) is 0.1 to 50% by mass, and the mass ratio of the component (A) to the component (B) ( An aqueous liquid skin cleanser having a pH of 6.5 to 10 when A) / (B) is 10/1 to 10/5 and diluted 20-fold with ion-exchanged water.
(A) Phosphoric acid monoester represented by formula (1) or a salt thereof

[Wherein, R ¹ represents an alkyl group having an average carbon number of 10 to 14, X ¹ and X ² each represents a hydrogen atom or an alkali metal, and n represents an average number of moles of ethylene oxide added, which is a number of 0 to 2. Indicates. ]
(B) 2-ethylhexyl glyceryl ether [selection] None

Description

  The present invention relates to an aqueous liquid skin cleanser excellent in the action of removing excess stratum corneum.

  Conventionally, it has been proposed to add a granular substance (scrub agent) to cosmetics to enhance the cleaning and massage effect (see, for example, Patent Document 1). However, depending on the type of scrubbing agent, the stratum corneum may be damaged, and it may accidentally enter the eye.

  On the other hand, it is known that a skin cleanser containing an anionic surfactant and a specific glyceryl ether has low irritation to the skin and good foaming (see Patent Document 2).

JP 58-192814 A JP 2001-107079 A

  Accordingly, an object of the present invention is to provide an aqueous liquid skin cleanser that is excellent in the action of removing excess stratum corneum without damaging the stratum corneum.

  The present invention comprises (A) phosphoric acid monoester or a salt thereof and (B) 2-ethylhexyl glyceryl ether, wherein the content of component (A) is 0.1 to 50% by mass, and component (A) And (B) component mass ratio (A) / (B) is 10/1 to 10/5, and pH is 6.5 to 10 when diluted 20 times with ion-exchanged water. Provide the agent.

  The aqueous liquid skin cleanser of the present invention is excellent in the action of removing excess stratum corneum, has no risk of damaging the skin, and can further beautify the skin.

  Hereinafter, the present invention will be described in detail.

  The component (A) phosphoric acid monoester or salt thereof used in the present invention is represented by the formula (1).

[Wherein, R ¹ represents an alkyl group having an average carbon number of 10 to 14, X ¹ and X ² each represents a hydrogen atom or an alkali metal, and n represents an average number of moles of ethylene oxide added, which is a number of 0 to 2. Indicates. ]
In formula (1), as the alkyl group represented by R ¹ , as long as the average number of carbon atoms is 10 to 14, any of alkyl groups derived from synthetic alcohols such as palm alcohols, natural alcohol-derived alkyl groups, oxocols, etc. Can be used. Here, the alkyl group is preferably a straight chain, but may include a partially branched alkyl group such as a methyl branch. Also, among those represented by X ¹ and X ^2, lithium as the alkali metal, potassium, sodium and the like, potassium and sodium are preferable.

  (A) Content of phosphoric acid monoester or its salt is 0.1-50 mass% in the aqueous liquid skin cleansing agent of this invention. The content in the aqueous liquid skin cleanser used by diluting with water at the time of use is preferably 5 to 40% by mass, more preferably 10 to 25% by mass. On the other hand, the content in the aqueous liquid skin cleanser used as it is for the skin without dilution is preferably 0.1 to 10% by mass, more preferably 0.5 to 2% by mass.

  (A) Phosphoric acid monoester or a salt thereof can also be used as a mixture with (C) phosphoric acid diester represented by formula (3) or a salt thereof.

[Wherein R ² and R ³ each represent a linear or branched alkyl group having an average carbon number of 10 to 14, X ³ represents a hydrogen atom or an alkali metal, and k and m represent average additions of ethylene oxide, respectively. The number of moles is 0-2. ]
In this case, the value of the mass ratio (A) / [(A) + (C)] is preferably 0.7 to 1, more preferably 0.8 to 1.

  Component (B) 2-ethylhexyl glyceryl ether used in the present invention is also called ethyl hexyl glycerin and is represented by the formula (2). As a commercially available product, for example, Senshiba SC50 (Seiwa Kasei) is available.

  In the present invention, the mass ratio (A) / (B) of the component (A) and the component (B) is 10/1 to 10/5, and preferably 10/1 to 10/4.

  The aqueous liquid skin cleanser of the present invention has a pH of 6.5 to 10 at 25 ° C. when diluted 20 times with ion exchange water, and is preferably 6.5 to 8 from the viewpoint of cleanability.

  The aqueous liquid skin cleanser of the present invention is an aqueous liquid using water as a medium. In addition, ingredients used in ordinary aqueous liquid skin cleansing agents, for example, humectants such as propylene glycol, glycerin, diethylene glycol monoethyl ether, sorbitol, panthenol; conditioning ingredients such as cationic polymers, silicone compounds and derivatives thereof; ethylene glycol distearin Pearling agents such as acid esters; Nonionic surfactants such as polyoxyethylene alkyl ethers and alkyl polyglucosides; Amphoteric surfactants such as amidopropyl betaine; Anionic surfactants other than component (A); Cetyltrimethylammonium Cationic surfactants such as salts; Scrub agents such as disintegrating granules; Detergency improvers such as crystalline cellulose; Colorants such as dyes and pigments; Viscosity such as methylcellulose, polyethylene glycol, clay minerals and ethanol Preparations: pH adjusters such as citric acid and potassium hydroxide; salts such as sodium chloride, plant extracts, antiseptics, bactericides, chelating agents, vitamins, anti-inflammatory agents, anti-dandruff agents, fragrances, pigments, ultraviolet rays Absorbers, whitening agents, antioxidants, cooling sensations, and the like can be appropriately blended.

  The aqueous liquid skin cleanser of the present invention can be, for example, a whole body cleanser, facial cleanser, makeup remover, hand wash and the like. Furthermore, a physical stratum corneum removing effect can be obtained by impregnating a sheet such as a nonwoven fabric.

  EXAMPLES Hereinafter, examples will be given to specifically describe the present invention.

Examples 1-6, Comparative Examples 1-8
Aqueous liquid skin cleansing agents shown in Table 1 were prepared and their stratum corneum removing ability was evaluated. The results are shown in Table 1.

(Measurement of stratum corneum removal ability)
A solution obtained by diluting an aqueous liquid skin cleanser 20 times with ion-exchanged water is put into a cup, and this cup is attached so as not to leak into the left and right forearms of each of 4 to 8 panelists, and then vibrated with a vibrator. . All the solutions in the cup were collected, the free cells were counted with a hemocytometer, and the amount of stratum corneum removed per unit was calculated. The aqueous liquid skin cleanser solution of Example 1 was used as a reference solution, and in each measurement, the relative value when the stratum corneum removal amount of Example 1 was 1 was defined as the stratum corneum removal ability of each cleanser.

(Evaluation criteria)
A: 1 or more B; 0.8 or more and less than 1 C; 0.5 or more and less than 0.8 D; less than 0.5

Claims (1)

Components (A) and (B) are contained, the content of component (A) is 0.1 to 50% by mass, and the mass ratio of components (A) and (B) (A) / (B) Is an aqueous liquid skin cleanser having a pH of 6.5 to 10 when diluted 20-fold with ion-exchanged water.
(A) Phosphoric acid monoester represented by formula (1) or a salt thereof

[Wherein, R ¹ represents an alkyl group having an average carbon number of 10 to 14, X ¹ and X ² each represents a hydrogen atom or an alkali metal, and n represents an average number of moles of ethylene oxide added, which is a number of 0 to 2. Indicates. ]
(B) 2-ethylhexyl glyceryl ether represented by the formula (2)