JP2021024839A - Liquid cleaning agent - Google Patents

Abstract

To provide a liquid cleaning agent that has good spreadability and slipperiness even on skin with sea water, is easy to foam on the face, and has excellent cleansing power.SOLUTION: A liquid cleaning agent comprises the following ingredient (A), ingredient (B), ingredient (C), ingredient (D), and water: (A) 6 to 24% by mass of potassium salt of saturated fatty acid having an even number of carbon atoms of 12 to 16; (B) 0.001 to 0.5% by mass of potassium salt of saturated fatty acid having an odd number of carbon atoms of 13 to 17; (C) 0.2 to 10% by mass of amphoteric surfactant; and (D) 0.5 to 12% by mass of dihydric alcohol having 3 to 6 carbon atoms.SELECTED DRAWING: None

Description

The present invention relates to a liquid cleansing agent used for washing the skin of the face, body and the like.

Conventionally, soap, which is a fatty acid salt, is often used as a cleansing agent for the skin of the face and body. Soap is a base that not only has a unique refreshing feeling after washing, but also has good biodegradability and is environmentally friendly. Liquid cleansers containing soap as the main component are widely used as general skin cleansers. For example, mixed fatty acids derived from coconut oil, palm oil and palm kernel oil are used as the fatty acids constituting the soap to be blended in the liquid cleaning agent, and these mixed fatty acids contain 30 to 40 mass of unsaturated fatty acids. It is contained in about%. However, unsaturated fatty acids have a problem that they have low storage stability and are prone to discoloration and odor deterioration.

In order to improve the storage stability of the liquid cleaning agent, a liquid cleaning agent using only saturated fatty acids has been proposed. Although this improves discoloration and odor deterioration, it tends to precipitate at low temperatures, so it has been an issue to achieve both foaming and low temperature stability. In order to solve this problem, for example, Patent Document 1 describes a liquid skin cleaning agent composition containing a saturated fatty acid salt having an even number of carbon atoms of 12 to 16 and a dihydric alcohol such as phenoxyethanol and propylene glycol. Has been proposed.

On the other hand, in recent years, there has been an increasing need for easy skin care, and there is a demand for a cleansing agent that can remove make-up cosmetics and wash a normal face at the same time. For example, Patent Document 2 describes a creamy skin cleaning agent containing a higher fatty acid salt having an even number of carbon atoms and a nonionic surfactant having an IOB value of 0.2 or more and less than 0.7 as a cleaning agent having a cleansing effect. Fees have been proposed. In order to enhance the cleansing power, it is preferable to blend the cleansing agent with the make-up cosmetics in a concentrated state without adding water to the cleansing agent. In that case, it is necessary to add water on the face to whisk. When whipping the cleansing agent on the palm, add a small amount of water in several batches to whisk it, while when whipping it on the face, it is necessary to moisten the hands and whisk it on the face after blending with the makeup cosmetics. Therefore, it is difficult to control the amount of water added during whipping, and the cleaning agent may be thicker than when whipping on the palm, and foaming on the face may be weakened. Furthermore, since the face is more susceptible to irritation than the palm, it is necessary to foam more gently, so it is not easy to develop a cleansing agent having excellent foaming on the face.

In addition, since sunscreens in recent years have improved water resistance, it is necessary to remove the sunscreen with a cleaning agent. As a cleaning agent for efficiently removing sunscreen, Patent Document 3 describes a potassium salt of a fatty acid having an even number of carbon atoms, an amphoteric surfactant, an acylmethyltaurine-type anionic surfactant, and a polyoxyethylene fatty acid glyceryl. A skin cleaning composition containing a type nonionic surfactant has been proposed. In order to efficiently remove the sunscreen, it is preferable to blend the cleaning agent with the sunscreen in a concentrated state.
On the other hand, liquid cleansers containing fatty acid salts have been developed that have good spreadability and slipperiness on the skin during bathing. However, after bathing in the sea where sunscreens are easily used, it has been a problem that the elongation and slipperiness on the skin are reduced due to the influence of the salt adhering to the skin as compared with the time of bathing. Therefore, if a cleaning agent containing a fatty acid salt is mixed with a sunscreen in a concentrated state after bathing in the sea, the spread and slipperiness on the skin are poor, and it is difficult to remove the sunscreen efficiently. there were.

JP-A-2017-214327 Japanese Unexamined Patent Publication No. 2012-167035 Japanese Unexamined Patent Publication No. 2014-76977

As described above, it has been known that by blending phenoxyethanol or dihydric alcohol with a liquid cleaning agent containing a fatty acid salt soap, both low temperature stability and foaming can be achieved. It has also been known that the cleansing effect can be improved by adding a nonionic surfactant or the like to a cleaning agent containing a fatty acid salt. However, the current situation is that a liquid cleansing agent having good spreadability and slipperiness even on the skin to which seawater has adhered, easily foaming on the face, and excellent cleansing power has not yet been developed.
An object of the present invention is to provide a liquid cleansing agent which has good spreadability and slipperiness even on the skin to which seawater is attached, easily foams on the face, and has excellent cleansing power.

As a result of diligent studies to solve the above problems, the present inventors have obtained a liquid cleaning agent having the desired effect by selecting a specific material and setting the blending ratio within a specific range. It was found that this was possible, and the present invention was completed.
That is, the present invention is a liquid cleaning agent containing the following components (A), component (B), component (C), component (D) and water.
(A) 6 to 24% by mass of potassium salt of saturated fatty acid having an even number of carbon atoms of 12 to 16
(B) 0.001 to 0.5% by mass of potassium salt of saturated fatty acid having an odd number of carbon atoms of 13 to 17
(C) 0.2 to 10% by mass of amphoteric surfactant
(D) 0.5 to 12% by mass of dihydric alcohol having 3 to 6 carbon atoms

According to the liquid cleansing agent of the present invention, it is possible to obtain the effects that it has good spreadability and slipperiness even on the skin to which seawater is attached, easily foams on the face, and has excellent cleansing power.

Hereinafter, embodiments of the present invention will be described.
The liquid cleaning agent of the present invention contains at least the following components (A), component (B), component (C), component (D) and water. Hereinafter, each component will be described.
In addition, the numerical range defined by using the symbol "~" in this specification shall include the numerical values at both ends (upper limit and lower limit) of "~". For example, "2-5" represents 2 or more and 5 or less.

<Component (A): Potassium salt of even saturated fatty acid>
The component (A) used in the present invention is a potassium salt of a saturated fatty acid having an even number of carbon atoms of 12 to 16 (also referred to as "even saturated fatty acid" in the present specification), in other words, the number of carbon atoms. Is a potassium salt of 12, 14 and 16 saturated fatty acids.
The potassium salt of the saturated fatty acid to be blended in the liquid cleaning agent of the present invention may be a potassium salt of the even saturated fatty acid in advance before blending, and an alkaline agent corresponding to the even saturated fatty acid in the liquid cleaning agent system May be blended.

The even-saturated fatty acid may be a single substance or a mixture, and specific examples thereof include one single saturated fatty acid among lauric acid, myristic acid and palmitic acid, or a mixed fatty acid in which two or more are combined. Be done. The potassium salt of the even saturated fatty acid is preferably a mixture of the potassium salt of the saturated fatty acid from the viewpoint of the amount of foam and the quality of foam.

In liquid cleaning agents, it is common to use a system containing free fatty acids (superfat). In the present invention, the even saturated fatty acid may be added to the system of the liquid cleaning agent after preparing the potassium salt of the even saturated fatty acid, or the amount of the alkaline agent added when the even saturated fatty acid is reacted with the alkaline agent. It may be reduced to leave unreacted free fatty acids. At this time, the content of the alkaline agent such as potassium hydroxide is preferably 0.80 to 0.99 equivalents with respect to the fatty acid.

The content of the component (A) is 6 to 24% by mass, preferably 8 to 22% by mass, and more preferably 10 to 20% by mass with respect to the total amount of the cleaning agent. If the content of the component (A) is too low, the foaming and cleansing power on the face may not be sufficient, and if the content is too high, the spread and slipperiness on the skin may be insufficient. is there.

<Component (B): Potassium salt of odd-saturated fatty acid>
The component (B) used in the present invention is a potassium salt of a saturated fatty acid having an odd number of carbon atoms of 13 to 17 (also referred to as "odd even saturated fatty acid" in the present specification), in other words, carbon. It is a potassium salt of saturated fatty acids of numbers 13, 15 and 17.

Examples of the fatty acid used in the component (B) include tridecanoic acid, pentadecic acid, heptadecanoic acid and the like, with pentadecanoic acid and heptadecanoic acid being preferable, and pentadecanoic acid and heptadecanoic acid being more preferably contained.

When pentadecane acid and heptadecylic acid are used in combination, the mass ratio of pentadecane acid / heptadecylic acid is preferably 1/30 to 30/1, more preferably 1/10 to 10/1, and 1/5. It is more preferably ~ 5/1, and particularly preferably 1/3 to 3/1. When such a mass ratio is in the above range, it is more preferable in terms of elongation and slipperiness on the skin and ease of foaming on the face.

When the component (B) contains pentadecane acid and heptadecylic acid, the total content of pentadecane acid and heptadecylic acid is preferably 95 to 100% by mass with respect to the total amount of the component (B). More preferably, it is ~ 100% by mass. When the contents of pentadecane acid and heptadecylic acid are in the above range, it is possible to obtain a good balance of spreadability and slipperiness on the skin and ease of foaming on the face.

The content of the component (B) is 0.001 to 0.5% by mass, preferably 0.005 to 0.4% by mass, and more preferably 0.01 to 0% by mass with respect to the total amount of the cleaning agent. .3% by mass, particularly preferably 0.02 to 0.2% by mass. If the content of the component (B) is too low, the spread and slipperiness on the skin may decrease, and the foaming and cleansing power on the face may be insufficient. If the content is too high, it may be blended. The effect may not be commensurate with the amount, which may be economically disadvantageous.

<Component (C): amphoteric surfactant>
The component (C) used in the present invention is an amphoteric surfactant. Examples of the amphoteric tenside include alkyldimethylaminoacetic acid betaine, amidopropyldimethylaminoacetic acid betaine, alkylaminodicarboxylic acid salt and the like. Among these, betaine amidopropyldimethylaminoacetic acid and alkylaminodicarboxylic acid salt are preferable from the viewpoint of improving foaming and cleansing power on the face. These amphoteric surfactants may be used alone or in combination of two or more.

The content of the component (C) is 0.2 to 10% by mass, preferably 1 to 8% by mass, and more preferably 1.5 to 6% by mass with respect to the total amount of the cleaning agent. If the content of the component (C) is too low, the foaming and cleansing power on the face may be insufficient, and if the content is too high, the spread and slipperiness on the skin may be reduced. ..

<Component (D): Divalent alcohol having 3 to 6 carbon atoms>
The component (D) used in the present invention is a dihydric alcohol having 3 to 6 carbon atoms. Examples of the dihydric alcohol having 3 to 6 carbon atoms include 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, and 1,5-pentanediol. Examples thereof include 1,6-hexanediol and dipropylene glycol. Among these, propylene glycol and dipropylene glycol are preferable from the viewpoint of improving elongation on the skin, slipperiness and cleansing power. These dihydric alcohols may be used alone or in combination of two or more.

The content of the component (D) is 0.5 to 12% by mass, preferably 2 to 10% by mass, and more preferably 4 to 8% by mass with respect to the total amount of the cleaning agent. If the content of the component (D) is too small, the spread and slipperiness on the skin and the cleansing power may be reduced, and if the content is too large, the foaming on the face may be insufficient. ..

<Water>
The liquid cleaning agent of the present invention contains water in addition to the above components (A) to (D). As the water, deionized water, ion-exchanged water, and distilled water are preferable.

Regarding the water content, the total content of each component (A) to (D) and water is 80% by mass or more, preferably 85 to 100% by mass, more preferably 90 to the total amount of the cleaning agent. It is appropriately set so as to be 99% by mass.

<Other additive ingredients>
In addition to the above-mentioned components (A) to (D) and water, the liquid cleaning agent of the present invention may further contain general components used in cosmetics and cleaning agents as additional components.
Examples of other additive components include fats and oils such as vegetable fats and oils, animal fats and oils; fatty acids; pH adjusters; antioxidants; metal sequestering agents; pigments; fragrances; pigments and the like. The content of the other additive components is preferably 15% by mass or less, and more preferably 10% by mass or less, based on the total amount of the cleaning agent.

The liquid cleaning agent of the present invention can be produced by a known method. For example, potassium salt of even-saturated fatty acid as component (A), potassium salt of odd-saturated fatty acid as component (B), sodium laurylaminodiacetate as component (C), dipropylene glycol as component (D), And water and the like are mixed, heated and uniformly mixed, and then stirred and cooled to around room temperature to produce the liquid cleaning agent of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
<Examples 1 to 11 and Comparative Examples 1 to 2>
The liquid cleaning agents shown in Table 3 (Examples 1 to 11) and Table 4 (Comparative Examples 1 to 2) were prepared with the composition of the potassium salt of the saturated fatty acid shown in Tables 1 and 2, and evaluated by the following method.
In Tables 3 and 4, the numerical value of each component indicates the content (mass%) with respect to the total amount of the cleaning agent.

The following raw materials were used.
・ Lauric acid: Special grade reagent (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Myristic acid: Special grade reagent (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Palmitic acid: Special grade reagent (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Pentadecylic acid: Special grade reagent (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Heptadecane acid: Special grade reagent (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Sodium laurylaminodiacetate: Nissan Anon LA (manufactured by NOF CORPORATION)
-Palm oil fatty acid amide propyl betaine: Nissan Anon (registered trademark) BDF-SF (manufactured by NOF Corporation)

<Evaluation method>
(1) Evaluation of slipperiness on the skin after bathing The following criteria are used for slipperiness when 20 women aged 25 to 55 years old are selected as panelists, and 3 g of liquid cleansing agent is picked up after bathing and applied to the body. It was evaluated in.
2 points: When you feel that the elongation and slipperiness are very good.
1 point: When you feel that the elongation and slipperiness are a little good.
0 points: When you feel that the extension and slipperiness are poor.

(2) Evaluation of foaming on the face 20 women aged 25 to 55 who made up were used as panelists, picked up 3 g of liquid cleansing agent, blended with make-up cosmetics, and then warm water at 38 ° C. The foaming when foaming on the face after wetting both hands was evaluated according to the following criteria.
2 points: When you feel that the foam is very easy to foam and the foam is thick enough.
1 point: When it is easy to foam and you feel that the foam is a little thick.
0 point: When it is difficult to foam and you feel that the foam is not thick.

(3) Evaluation of cleansing power Following the above (2), after rinsing with lukewarm water at 38 ° C., the ease of removing the makeup cosmetics was evaluated according to the following criteria.
2 points: When you feel that the makeup cosmetics have fallen sufficiently.
1 point: When you feel that the makeup cosmetics have fallen to some extent.
0 points: When you feel that the makeup cosmetics are clearly not removed.

The evaluations (1) to (3) above were judged according to the following criteria and are shown in Tables 2 and 3, respectively. In addition, "◎" and "○" were judged as passing.
⊚: Total score is 36 points or more ○: Total score is 30 points or more and less than 36 points △: Total score is 20 points or more and less than 30 points ×: Total score is less than 20 points

All of the liquid cleansing agents of Examples 1 to 11 had good spreadability and slipperiness on the skin after bathing in the sea, were easily foamed on the face, and were excellent in cleansing power.
On the other hand, in Comparative Examples 1 and 2, sufficient performance is not obtained.
In Comparative Example 1, since the component (B) was not blended, the spread and slipperiness on the skin after bathing in the sea were poor, it was difficult to foam on the face, and the cleansing power was insufficient.
In Comparative Example 2, although glyceryl isostearate was blended, since the component (B) was not blended, the spread and slipperiness on the skin after bathing in the sea were poor, and it was difficult to foam on the face.

<Example 12>
A liquid cleaning agent was prepared according to the formulation shown below, and evaluated in the same manner as in the above Examples.
(A) Saturated fatty acid potassium salt A2 15% by mass in Table 1
(B) Saturated fatty acid potassium salt B3 0.02% by mass in Table 2
(C) Sodium Lauryl Amino Diacetate 1% by Mass
(C) Coconut oil fatty acid amide propyl betaine 1% by mass
(D) Propylene glycol 2% by mass
(D) Dipropylene glycol 2% by mass
71% by mass of water
(Other additive ingredients)
Potassium stearate 1% by mass
Coconut oil fatty acid methyl taurine sodium 2% by mass
Coconut oil fatty acid amide propyl betaine 2% by mass
Lauric acid diethanolamide 1% by mass
Ethylene glycol distearate 1% by mass
Etidronate tetrasodium 0.2% by mass
4 sodium edetate 0.2% by mass
Polyquaternium-7 0.1% by mass
Polyquaternium-10 0.1% by mass
Polyquaternium-51 0.1% by mass
Fragrance 0.28% by mass
Total blending amount 100% by mass

The liquid cleansing agent of Example 12 had good spreadability and slipperiness on the skin after bathing in the sea, was easily foamed on the face, and was excellent in cleansing power.

Claims (1)

A liquid cleaning agent containing the following components (A), component (B), component (C), component (D) and water.
(A) 6 to 24% by mass of potassium salt of saturated fatty acid having an even number of carbon atoms of 12 to 16
(B) 0.001 to 0.5% by mass of potassium salt of saturated fatty acid having an odd number of carbon atoms of 13 to 17
(C) 0.2 to 10% by mass of amphoteric surfactant
(D) 0.5 to 12% by mass of dihydric alcohol having 3 to 6 carbon atoms