JP5503180B2 - Skin cleanser - Google Patents

Description

  The present invention relates to a skin cleanser.

  In order to easily wash the face with creamy foam, a “foam type facial cleanser” in which foam is discharged in a former container is widely preferred. In the former container, the surfactant solution is foamed through a fine mesh. If the surfactant solution is left attached to the mesh, the water evaporates and the surfactant forms a dry film on the mesh. For this reason, clogging of the mesh occurs, the pump pressing force increases, and there arises a problem that the pump is hard and difficult to press during use, or cannot be discharged from the former container. Such a problem occurs particularly remarkably when a fatty acid salt or the like widely used as a skin cleanser is used.

  In order to solve such a problem, a method of mixing a large amount of a polyhydric alcohol such as propylene glycol to prevent solidification of the dry film has been studied (Patent Documents 1 and 2).

JP-A-10-218744 JP 11-358972 A

However, depending on the type of polyhydric alcohol, there is a problem that when a large amount is blended, the surfactant is likely to precipitate at a low temperature. Moreover, the cleaning agent containing a large amount of propylene glycol or the like has a problem that the foam quality deteriorates.
It is an object of the present invention to provide a cleaning agent that does not impair clogging and does not impair low temperature stability and foam performance.

  The present inventors have been able to maintain and improve the stability and foam performance at a low temperature by using a combination of two kinds of polyhydric alcohols having different IOB values. It has been found that the discharge performance of the above does not deteriorate.

The present invention includes the following components (A) to (D):
(A) 2-20% by mass of an anionic surfactant containing a carboxyl group,
(B) 0.05 to 10% by mass of a polyhydric alcohol having an IOB value of 1 to 2,
(C) 0.05 to 10% by mass of a polyhydric alcohol having an IOB value of 3 to 4,
(D) To provide a skin cleanser containing water.

  The skin cleanser of the present invention does not precipitate a surfactant even at a low temperature, has excellent low-temperature stability, has good foam characteristics, and is not easily clogged even when used in a former container.

  Examples of the anionic surfactant containing a carboxyl group of the component (A) used in the present invention include fatty acid salts, polyoxyethylene alkyl ether carboxylates, N-acyl amino acid surfactants, aminodiacetic acid surfactants, and the like. Is mentioned.

  More specifically, the fatty acid salt is preferably a fatty acid salt having 8 to 24 carbon atoms, for example, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, behenic acid, lignoceric acid. And the like. Examples of these salts include alkali metals such as sodium and potassium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and basic amino acids such as arginine and lysine.

  As a polyoxyethylene alkyl ether carboxylate, what is represented by following Formula (1) is preferable.

(In the formula, R ¹ represents an alkyl group or alkenyl group having 10 to 18 carbon atoms, n represents an average number of 0.5 to 10, and X represents a hydrogen atom, an alkali metal, an alkaline earth metal, or ammonium. Or organic ammonium)

In formula (1), R ¹ is particularly preferably an alkyl group having 12 to 16 carbon atoms. Moreover, although the average addition mole number n of ethylene oxide is 0.5-10, 1-6 are especially preferable.
X is preferably an alkali metal such as sodium or potassium; ammonium; an ammonium derived from an alkanolamine such as monoethanolamine, diethanolamine or triethanolamine; a cation derived from a basic amino acid such as arginine or lysine.

  Examples of the N-acyl amino acid surfactant include those represented by the following formula (2).

(In the formula, R ² represents a linear or branched alkyl group or alkenyl group having 7 to 21 carbon atoms, R ³ represents a hydrogen atom or an alkyl group or alkenyl group having 1 to 4 carbon atoms, and R ⁴ represents A hydrogen atom or — (CH ₂ ) _p R ⁵ (R ⁵ represents a hydrogen atom, a hydroxyl group or —COOM ¹ ), and M ¹ represents a hydrogen atom, an alkali metal or an alkanolamine)

In formula (2), R ² is preferably an alkyl group having 6 to 18 carbon atoms, and particularly preferably an alkyl group having 10 to 14 carbon atoms. R ³ is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, particularly preferably a hydrogen atom or a methyl group. R ⁴ is preferably a hydrogen atom, — (CH ₂ ) _p R ⁵ . M ¹ is preferably potassium or triethanolamine.

  Of the N-acylamino acid surfactants represented by the formula (2), preferred are N-cocoyl glycine, N-lauroyl glutamic acid, N-myristoyl glutamic acid, N-lauroyl-N-methyl glycine, N- Lauroyl-β-alanine, N-myristoyl-β-alanine, N-lauroylaspartic acid, N-lauroylserine and the like; and alkali metal salts such as sodium and potassium; Alkanols such as monoethanolamine, diethanolamine and triethanolamine Examples include amine salts. The compound represented by the formula (2) includes L-form, D-form, and racemate, and any of these can be used in the present invention.

  Examples of the aminodiacetic acid-based surfactant include those represented by the following formula (3).

(In the formula, R ⁵ represents an alkyl group having 8 to 24 carbon atoms, an alkenyl group, an aryl group, an aralkyl group, an alkylaryl group or an alkenylaryl group, and Y represents a hydrogen atom or — (CH ₂ ) _q COOM ² . M ² represents a hydrogen atom, an alkali metal, ammonium, or an alkanolamine having a hydroxyalkyl group having 2 to 3 carbon atoms, and q represents a number of 1 to 4)

In formula (3), R ⁵ is preferably an alkyl group having 8 to 14 carbon atoms, Y is preferably a hydrogen atom, M ² is preferably potassium or alkanolamine, and q is 1 to 2 Is preferred.

  Of the aminodiacetic acid surfactants represented by the formula (3), preferred are laurylaminopropionic acid, myristylaminopropionic acid, and the like.

  As the component (A), fatty acid salts, polyoxyethylene alkyl ether carboxylates, and N-acyl amino acid surfactants are preferable from the viewpoint of the feeling during rinsing, and in particular, the feeling of foam quality, feeling of refreshment, etc. Fatty acid salts are preferred, fatty acid salts having 15 or less carbon atoms are more preferred, and lauric acid and myristic acid are even more preferred.

  Moreover, the anionic surfactant containing these carboxyl groups can be used 1 type or in mixture of 2 or more types. In particular, it is preferable to use a combination of two or more, and by combining a salt of lauric acid and myristic acid and a polyoxyethylene alkyl ether carboxylate salt, the coating of the surfactant during drying can be made flexible. Effective in suppressing clogging. In particular, the mass ratio of fatty acid to polyoxyethylene alkyl ether carboxylic acid is preferably 1: 2 to 2: 1.

Examples of the counter ion of the anionic surfactant containing a carboxyl group as the component (A) include alkali metals such as sodium and potassium, basic amino acids, and organic amines. Of these, alkali metal salts are preferred, and potassium salts are particularly preferred.
The molar ratio of the basic counter ion to the anionic surfactant containing a carboxyl group is 60 to 120%, particularly 65 to 115%, and more preferably 70 to 110%. From the point of view, it is preferable.

  The anionic surfactant containing the carboxyl group of the component (A) is contained in the whole composition in an amount of 2 to 20% by mass, preferably 4 to 18% by mass, more preferably 5 to 15% by mass. Within this range, it is preferable from the viewpoints of the persistence of the foam during washing, the cleaning power, and the lack of a feeling of skin tension.

The component (B) used in the present invention is a polyhydric alcohol having an IOB value of 1 to 2.
Here, the IOB value is an inorganic value obtained based on an organic conceptual diagram (Akira Fujita, prediction of organic compounds and an organic conceptual diagram, chemical area Vol. 11, No. 10 (1957) 719-725) and It represents the ratio of organic values (Inorganic Organic Balance) and is obtained by the following equation.

  Examples of the polyhydric alcohol having an IOB value of 1 to 2 of the component (B) include ethyl diglycol (IOB; 1.2), dipropylene glycol (IOB; 1.8), PPG-9 diglyceryl (IOB; 1. 1), hexylene glycol (IOB; 1.8), pentylene glycol (IOB; 2.0) and the like. Among them, ethyl diglycol (IOB; 1.2), dipropylene glycol (IOB; 1.). 8) is preferable from the viewpoint of the effect of suppressing the clogging of the discharge port of the container and the mesh of the former container and the feeling of use (no stickiness).

  Component (B) is contained in the total composition in an amount of 0.05 to 10% by mass, preferably 0.1 to 7% by mass, from the viewpoint of suppressing mesh clogging of component (A) and impairing foam performance. More preferably 0.5 to 5% by mass is contained.

  Component (C) is a polyhydric alcohol having an IOB value of 3-4. Examples of the polyhydric alcohol having an IOB value of 3 to 4 include propylene glycol (IOB; 3.3) and diglycerin (IOB; 3.5). Among them, propylene glycol (IOB; 3.3) is It is preferable from the point of use feeling (non-stickiness).

  Component (C) is contained in an amount of 0.05 to 10% by mass, preferably 0.1 to 7% by mass, from the viewpoint of not impairing the foam performance while suppressing precipitation of component (A) at a low temperature. %, More preferably 0.5 to 5% by mass.

  The skin cleansing agent of the present invention contains (D) water. It is preferable to contain 40 to 90 mass% of water in the whole composition.

The anionic surfactant containing the carboxyl group of the component (A) has been used as a cleaning base material because it is excellent in feeling of use such as foam quality and feel when rinsing. However, since these anionic surfactants are easily solidified during drying, problems such as clogging of containers and loss of aesthetics have occurred. On the other hand, attempts have been made to suppress drying by using water-soluble polyhydric alcohols, but this has been a cause of deterioration of foam quality and precipitation of component (A) at low temperatures.
In the present invention, the components (B) and (C) are combined, and in particular, the mass ratio of the components (B) and (C) is from the point of suppressing precipitation at low temperatures while suppressing clogging of the mesh. (B) / (C) = 10/1 to 1/10, more preferably 7/1 to 1/2.

  Further, the mass ratio of the components (A), (B) and (C) is ((B) + (C)) / (A) = 4/1 to 1/10, and further 2/1 to 3 / 20 is preferred.

  The skin cleanser of the present invention can further contain component (E) phenoxyethanol. Phenoxyethanol is widely used as a preservative, but is very useful in the present invention because it has an effect of suppressing mesh clogging.

It is preferable that phenoxyethanol is contained in the total composition in an amount of 0.05 to 1% by mass, particularly 0.1 to 0.5% by mass, from the viewpoint of preventing mesh clogging, antiseptic properties, and no irritation to the skin.
In particular, the mass ratio of the component (A) and the component (E) is preferably (E) / (A) = 0.005 to 0.05, and more preferably 0.01 to 0.03.

  The cleaning agent of the present invention further comprises components used in ordinary cleaning agents, for example, surfactants other than component (A), moisturizing agents, oily components, bactericides, anti-inflammatory agents, preservatives, chelating agents, It can contain a sticking agent, salts, pearling agent, scrub agent, fragrance, cooling agent, pigment, ultraviolet absorber, antioxidant, plant extract and the like.

  The skin cleanser of this invention is manufactured by mixing a compounding component by a normal method. The obtained skin cleanser is a liquid aqueous preparation, and its viscosity varies depending on the container to be used, but the viscosity when measured with a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) is 50 mPa · s or less, particularly 5 to 40 mPa · s is preferable, and can be adjusted by appropriately selecting the blending components. When the clay of the cleaning agent exceeds 50 mPa · s, there is a tendency that uniform bubbles cannot be obtained and extrusion is difficult. In order to be able to be used comfortably in any use environment, it is desirable that both have the above-mentioned viscosity at around room temperature (30 ° C.) and at a low temperature (0 ° C.) assuming winter.

  The skin cleanser of the present invention is preferably used by filling it into a former container having a porous membrane. Examples of the porous film include a sponge, a sintered body, and a net. Among these porous membranes, if the cleaning agent remaining on the membrane clogs due to drying and solidification, the clogging can be solved by dissolving the solidified material immediately by the flow of bubbles during the next discharge. A net that is thin is preferred. The net is preferably 50 to 500 mesh, and particularly preferably 200 to 400 mesh in order to produce good foam. Moreover, nylon, polyester, etc. are mentioned as a preferable material of such a mesh.

The container preferably has a plurality of such films, and in particular, from the viewpoints of economy, foam stability, and the like, it is preferable that there are two. The former container may be any one as long as it mixes a certain amount of cleaning liquid with a certain amount of air and discharges it in a foam state. Squeeze foamers used by pressing the torso of a soft container with fingers, as described in Japanese Patent Publication No. Sho, JP-B 52-16567, etc .; No. 103458, JP-A-7-315463, etc., and a pump former used by pressing the head of a cap provided with a pump mechanism with fingers.
By allowing the skin cleanser to pass through fine mesh holes with a pump or the like and mixing with air, a homogeneous and creamy foam can be easily formed.

  The skin cleanser of the present invention is suitable as a facial cleanser, body soap, hand soap and the like.

In the following examples, Examples 3, 4, 7, 8, and 9 are reference examples and are not included in the scope of the present invention.
Examples 1-9, Comparative Examples 1-7
A skin cleanser having the composition shown in Table 1 was prepared by mixing each component according to a conventional method, and 100 g was put into a pump former container (160 mL) [YF-9413, manufactured by Yoshino Kogyo Co., Ltd.]. Extrusion was performed with 1 g of discharged liquid at a time, and foam quality, skin feel, mesh clogging and low temperature stability were evaluated. Further, the liquid viscosity of the skin cleanser was measured. The results are shown in Table 1 and Table 2 together.
In addition, the compounding mass% shown in Table 1 is an effective part of surfactant. The molar ratio of alkali to component (A) is as shown in Table 1. Further, as the alkali, potassium and arginine can be used in combination, and the molar ratio is as shown in Table 1.

(Evaluation method)
(1) Foam quality:
Ten professional evaluators actually used each of the skin cleansing agents, and the foam quality was subjected to sensory evaluation based on the following five-level evaluation criteria, and the total score was obtained.
(5-level evaluation criteria)
Score 4; high elasticity.
Score 3; Slightly elastic.
Score 2: There is a feeling of elasticity.
Grade 1: There is not much elasticity.
Score 0: No elasticity.

(2) Skin feel:
Ten professional evaluators actually used each of the skin cleansing agents, and sensory evaluation of the skin feel after cleaning was performed according to the following five-level evaluation criteria, and the total score was obtained.
(5-level evaluation criteria)
Score 4; I don't feel any tension.
Rating 3; I feel a slight tension.
Score 2; I feel a little uncomfortable.
Rating 1; I feel a sense of tension.
Score 0; I feel a strong sense of tension.

(3) Mesh clogging:
Each skin cleanser was stored at 30 ° C. and 30% RH, and foam was discharged once every week. This was continuously evaluated for 8 weeks. The pushing force of the pump after the end of the evaluation period was subjected to sensory evaluation according to the following five-step evaluation criteria, and the total score of each sample 10 specimens was obtained.
(5-level evaluation criteria)
Score 4: Can be extruded as usual without any discomfort.
Score 3; slightly higher pump pressure.
Score 2: the pump pressure increases.
Score 1: The pressing pressure is clearly high and there is a sense of incongruity.
Rating 0: Discharge is difficult.

(4) Low temperature stability:
Each skin cleanser is stored in a -5 ° C (humidity-reduced) environment, and after 1 week of storage, the appearance of the liquid is evaluated. According to the above, the liquid state at a low temperature was determined.
(4 step criteria)
A: Not precipitated.
○: Slightly turbid.
Δ: A precipitate is formed, but dissolves immediately after returning to room temperature.
X: Precipitation was precipitated and dissolution was difficult even when the temperature was returned to room temperature.

(5) Liquid viscosity:
The viscosity was measured at 30 ° C. and 0 ° C. using a B-type (Brookfield) viscometer at a rotation speed of 60 rpm.

Example 8 (face wash for pump former)
(mass%)
Lauric acid 3.0
Myristic acid 1.5
Polyoxyethylene (4.5) lauryl ether acetic acid 4.0
Potassium hydroxide 0.54
Arginine 3.37
Dipropylene glycol 3.0
Propylene glycol 3.0
Lauroyl sulfobetaine 1.5
PEG6000 3.0
Sorbitol 3.0
Edetate disodium 0.1
Purified water balance <br/> Total 100.0

Example 9 (face wash for pump former)
(mass%)
Lauric acid 3.0
Myristic acid 1.5
Polyoxyethylene (4.5) lauryl ether acetic acid 4.0
Potassium hydroxide 0.54
Arginine 3.37
Dipropylene glycol 5.0
Propylene glycol 15.0
Lauroyl sulfobetaine 1.5
PEG6000 3.0
Sorbitol 3.0
Edetate disodium 0.1
Purified water balance <br/> Total 100.0

  All of the skin cleansing agents of Examples 8 and 9 were excellent in foaming property and low temperature stability, and were not clogged.

Claims (4)

Next components (A) to (E) :
(A) 2-20% by mass of an anionic surfactant containing a carboxyl group,
(B) 0.05 to 10% by mass of a polyhydric alcohol having an IOB value of 1 to 2,
(C) 0.05 to 10% by mass of a polyhydric alcohol having an IOB value of 3 to 4,
(D) Water
(E) Phenoxyethanol 0.05-1% by mass
A skin cleanser that contains and contains a foam container .   The skin cleanser according to claim 1, wherein the component (A) is at least one selected from fatty acid salts, polyoxyethylene alkyl ether carboxylates and N-acyl amino acid surfactants.   The skin cleanser according to claim 1 or 2, wherein the mass ratio of the components (B) and (C) is (B) / (C) = 10/1 to 1/10.   The mass ratio of components (A), (B), and (C) is ((B) + (C)) / (A) = 4/1 to 1/10. The skin cleanser described.