JP2006206525A - Pasty skin detergent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pasty skin detergent of a fatty acid-based soap well soluble in water, having foamability and excellent in storage stability. <P>SOLUTION: The pasty skin detergent comprises (a) 25-50 mass% higher fatty acid soap (such as potassium laurate soap, potassium myristate soap and potassium stearate soap), (b) 0.5-10 mass% lower alcohol (such as ethyl alcohol) and (c) water, and, if required, (d) a polyhydric alcohol. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paste-like skin cleanser that has good water solubility and foamability and is excellent in storage stability.

  Skin cleansing bases are mainly composed of fatty acid alkali metal salts (fatty acid soaps) as the main component, and paste-like formulations that are easy to use are popular in the market. .

  As a technique for pasting a fatty acid soap-based skin cleansing base, a method of softening soap gel by blending a high amount of polyhydric alcohol (for example, divalent glycol, polyethylene glycol, etc.) in the formulation (for example, Patent Document 1) In general, the amount of fatty acid soap itself is reduced to lower the viscosity of the system to form a paste.

  However, when blended with a high amount of polyhydric alcohol, it has the disadvantage of poor water solubility during use, and when it is made into a paste by reducing the amount of fatty acid soap itself, the foamability is reduced. There were drawbacks.

Japanese Patent Publication No. 6-31412

  An object of the present invention is to provide a fatty acid soap-based paste-like skin cleanser having good water solubility and foamability and excellent storage stability.

  In order to solve the above problems, the present invention provides a paste-like skin containing (a) 25 to 50% by mass of a higher fatty acid soap, (b) 0.5 to 10% by mass of a lower alcohol, and (c) water. Provide cleaning fee.

  Moreover, this invention provides the said paste-form skin cleansing agent whose higher fatty acid which comprises (a) component is a C12-C18 fatty acid.

  Moreover, this invention provides the said paste-form skin cleansing agent whose (b) component is ethyl alcohol.

  The present invention also provides the above paste-like skin cleanser further comprising (d) a polyhydric alcohol.

  According to the present invention, a fatty acid soap-based paste-like skin cleanser having good water solubility and foamability and excellent storage stability can be obtained.

  Hereinafter, the present invention will be described in detail.

  As the higher fatty acid used in the higher fatty acid soap as the component (a) of the present invention, a fatty acid having 12 or more carbon atoms is preferably used, and more preferably a fatty acid having 12 to 18 carbon atoms. Specific examples include lauric acid, myristic acid, palmitic acid, and stearic acid. These fatty acids are used alone or in combination of two or more.

  Examples of the counter ion of the higher fatty acid soap include sodium, potassium and triethanolamine.

  The higher fatty acid soap in the present invention refers to a product obtained by neutralizing a part or all of the higher fatty acid with a base. In the present invention, there may be free higher fatty acids that remain unreacted without being neutralized. In particular, a neutralization rate of 30 to 100% is preferable from the viewpoint of pH stability in the system. In the present invention, the blending amount of the higher fatty acid soap refers to the total amount of the fatty acid and the base that neutralizes part to all of the fatty acid.

  In the present invention, the higher fatty acid soap can be obtained by a method in which, for example, a higher fatty acid and an alkaline aqueous solution containing the above counter ion are mixed together with other components to produce a higher fatty acid soap in the system. Of course, it is not done.

  (A) The compounding quantity of a component is 25-50 mass% in the skin cleaning material of this invention, Preferably it is 25-45 mass%. When the blending amount is less than 25% by mass, it is difficult to obtain a sufficient foaming power as a product, while when it exceeds 50% by mass, it is difficult to design a paste-form dosage form.

  The lower alcohol as the component (b) of the present invention is preferably an alcohol having 1 to 3 carbon atoms, and the skin cleansing agent is most preferably ethyl alcohol.

  (B) The compounding quantity of a component is 0.5-10 mass% in the skin cleansing material of this invention, More preferably, it is 2-8 mass%. If the blending amount is less than 0.5% by mass, the base containing 25% by mass or more of the component (a) cannot be made into a paste. On the other hand, if it exceeds 10% by mass, the paste can be maintained at room temperature, The storage stability at is poor.

  The remainder of the water as component (c) of the present invention is blended.

  In the present invention, a large amount of polyhydric alcohol (for example, divalent glycol, polyethylene glycol, etc.) has been blended in the higher fatty acid-based detergent containing the components (a) and (c) for pasting. By replacing 0.5 to 10% by mass of component (b) in place of all or part of the polyhydric alcohol, a paste-like skin cleanser with excellent water solubility, foamability and storage stability is obtained. I was able to get it.

  In the present invention, (d) a polyhydric alcohol may be further blended. Examples of the component (d) include glycerin, butylene glycol, propylene glycol, dipropylene glycol, maltitol (sorbite, mabit, etc.), polyethylene glycol (300, 400, 1000, 1500) and the like. It is not limited to the examples. When the component (d) is blended, the blending amount varies depending on the blending amount of the component (a), the balance of the fatty acid used, and the like, and thus it is difficult to determine unconditionally. In particular, it is preferably about 20% by mass or less. The lower limit of the amount is not particularly limited, but is preferably about 5% by mass or more.

  In the present invention, the “paste-like” means that a paste-like (paste-like) is exhibited at room temperature (25 ° C.). More specifically, in the present invention, the hardness is 200 or less which is the upper limit of measurement by the method described below. The hardness was measured with a card meter (manufactured by Iio Electric). As the card meter measurement conditions, a pressure sensitive shaft 8φ and a load 200 g were used. The hardness was defined as the numerical value of the scale when the pressure-sensitive axis began to penetrate into the interior from the flat surface of the sample.

  In addition to the above-mentioned components, the paste-like skin cleanser base of the present invention can optionally contain components that can be added to a normal skin cleanser as long as the effects of the present invention are not impaired. Examples of such components include buffering agents (eg, citric acid, sodium citrate, etc.), chelating agents (eg, EDTA, etc.), dyes, fragrances, etc., but are not limited to these examples.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto. Unless otherwise specified, all the amounts are mass%.

First, the evaluation method performed in the present example will be described.
≪Evaluation method≫

[Viscosity during production]
At the time of manufacture, the state of the whole system was observed in a state of 60 ° C. to 90 ° C. after neutralization while stirring with a three-one motor (HEIDON company: rotation speed 0 to 800 rpm).
(Evaluation)
○: Even if the entire system is liquid or partially semi-solid, the entire system can be sufficiently stirred uniformly, and the transition to the next process can be smoothly performed. The entire system is in a semi-solid state, but if it is not possible, it is possible to shift to the next process. ×: The entire system is solidified and cannot be transferred to the next process, so a paste-like cleaning material cannot be obtained.

[Water-soluble during use]
An acrylic plate having 5 rows of 5 different grooves each having a diameter of 1 cm and an interval of 0.5 mm and a depth of 0.5 to 2.5 mm was prepared, and samples were packed in these grooves. The sample was observed for 5 minutes every minute while flowing a constant water flow. The total number of holes in which no sample remained was counted for each row, and the water solubility was quantified by averaging the data in 5 rows (score: 0 to 25). The higher the score, the better the water solubility.
(Evaluation)
○: Score 15 to 25 (fast water solubility)
(Triangle | delta): Score 7-15 (water damage is a little slow)
X: Less than 7 points (water dissolution is slow)

[Foaming]
A 1% aqueous solution (CaCl ₂ 70 ppm hard water) of a test sample was prepared, and the amount of bubbles after stirring for 60 seconds at 4500 rpm was measured with a 3000 ml glass cup mixer and evaluated as follows.
(Evaluation)
○: Good foaming (foam volume 1800ml or more and less than 2000ml)
X: Poor foaming (foam amount less than 1600 ml)

[Properties after storage at 40 ° C]
The storage state at 40 ° C. for 6 months was used as an accelerated test for the storage state (room temperature) for 3 years, which is the quality guarantee period for cosmetics.
(Evaluation)
○: Good condition △: Somewhat bad ×: Bad condition (softening and water separation are not suitable as products)

(Examples 1-4, Comparative Examples 1-3)
Samples having the composition shown in Table 1 below were prepared, and the viscosity at the time of manufacture, water solubility at the time of use, foaming property, and properties after storage at 40 ° C. were evaluated by the above evaluation method and evaluation criteria. The results are shown in Table 1.

  As is clear from the results in Table 1, in Examples 1 to 4, good results were obtained with respect to viscosity during production, water solubility during use, foaming properties, and properties after storage at 40 ° C. All the effects of the present invention were combined. However, Comparative Examples 1 to 3 could not have the effects of the present invention.

  Further formulation examples are shown below.

[Prescription Example 1]
(Mixed component) (Mixed amount)
Lauric acid 6
Myristic acid 5
Palmitic acid 10
Stearic acid 10
Potassium hydroxide 5.6
Glycerin 5
Polyethylene glycol (300) 8
Dipropylene glycol 4
Ethyl alcohol 8
Glycerol monooleate 0.5
Cocoyl methyl taurine sodium 5
Dimethyldiallylammonium chloride / acrylamide copolymer 0.5
(10% aqueous solution. “Marcote 550” manufactured by Nalco)
Plant extract Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount Fragrance Appropriate amount Purified water Residue

[Prescription Example 2]
(Mixed component) (Mixed amount)
Lauric acid 3
Myristic acid 12
Palmitic acid 1
Stearic acid 20
Potassium hydroxide 6.5
Sorbitol 6
Polyethylene glycol (1500) 8
Propylene glycol 2
Ethyl alcohol 10
Glycerol monooleate 0.5
Sodium lauryl glycol acetate 6
Plant extract Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount Fragrance Appropriate amount Purified water Residue

[Prescription Example 3]
(Mixed component) (Mixed amount)
Lauric acid 4
Myristic acid 10
Palmitic acid 3
Stearic acid 9
Potassium hydroxide 4.6
Glycerin 6
Polyethylene glycol (300) 5
Butylene glycol 7
Ethyl alcohol 5
Glycerol monooleate 1
Cocoylglycine sodium 4
Acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer 1
(2.8% aqueous solution. "Marcoat Plus 3331" manufactured by Nalco)
Plant extract Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount Fragrance Appropriate amount Purified water Residue

[Prescription Example 4]
(Mixed component) (Mixed amount)
Lauric acid 5
Myristic acid 15
Palmitic acid 6
Stearic acid 14
Potassium hydroxide 7.6
Sorbitol 4
Dipropylene glycol 12
Butylene glycol 4
Ethyl alcohol 6
Cocoyl methyl taurine sodium 1
Cocamidoamidopropyl betaine 8
Plant extract Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount Fragrance Appropriate amount Purified water Residue

[Prescription Example 5]
(Mixed component) (Mixed amount)
Myristic acid 20
Palmitic acid 5
Stearic acid 5
Potassium hydroxide 5.6
Sorbitol 10
Polyethylene glycol (1500) 5
Ethyl alcohol 3
Glycerol monooleate 3
Cocoyl methyl taurine sodium 2
Cocoylglycine sodium 2
Cationized guar gum 1
Plant extract Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount Fragrance Appropriate amount Purified water Residue

Claims (4)

  (A) 25 to 50% by mass of a higher fatty acid soap, (b) 0.5 to 10% by mass of a lower alcohol, and (c) a paste-like skin cleanser containing water.   The pasty skin cleanser according to claim 1, wherein the higher fatty acid constituting the component (a) is a fatty acid having 12 to 18 carbon atoms.   The paste skin cleanser according to claim 1 or 2, wherein component (b) is ethyl alcohol.   The pasty skin cleanser according to any one of claims 1 to 3, further comprising (d) a polyhydric alcohol.