JP7188320B2 - Liquid cleaning agent - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid cleanser used for cleansing the skin of the face, body, and the like.

Soaps, which are fatty acid salts, have hitherto been widely used as skin cleansers for the face, body, and the like. Soap not only has a unique refreshing feeling after washing, but also has good biodegradability and is an environment-friendly base. Soap-based liquid cleansers are widely used as general skin cleansers. Fatty acids constituting soaps blended in liquid detergents include, for example, mixed fatty acids derived from coconut oil, palm oil and palm kernel oil, and these mixed fatty acids contain 30 to 40 masses of unsaturated fatty acids. %. However, unsaturated fatty acids have a problem that they have low storage stability and tend to cause discoloration and odor deterioration.

In order to improve the storage stability of liquid detergents, liquid detergents using only saturated fatty acids have been proposed. As a result, discoloration and odor deterioration can be improved, but since precipitation is likely to occur at low temperatures, achieving both foaming and low-temperature stability has been an issue. In order to solve this problem, for example, Patent Document 1 discloses a liquid skin cleanser composition containing a saturated fatty acid salt having an even number of carbon atoms of 12 to 16 carbon atoms, phenoxyethanol, and a dihydric alcohol such as propylene glycol. is proposed.

On the other hand, in recent years, there has been an increasing need for simple skin care, and there is a demand for a cleanser capable of removing make-up cosmetics and normal facial cleansing at the same time. For example, Patent Document 2 discloses a cream skin cleanser 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 cleansing agent having a cleansing effect. fee is proposed. In order to enhance the cleansing power, it is preferable to mix the cleansing agent in a thick state without adding water to the make-up cosmetic, in which case it is necessary to add water and lather the cleansing agent on the face. When lathering a cleanser on the palm, add a small amount of water in several batches while lathering on the face, but when lathering on the face, it is necessary to wet your hands after blending with makeup cosmetics and lather on the face. Therefore, it is difficult to control the amount of water added when lathering, and the cleanser becomes thicker than when lathering on the palm, and lathering on the face may be weak. Furthermore, since the face is more sensitive to irritation than the palm, it is necessary to lather gently, so it is not easy to develop a cleanser that lathers well on the face.

In addition, since recent sunscreens have improved water resistance, it is necessary to remove the sunscreen with a cleanser. As a cleansing agent for efficiently removing sunscreens, Patent Document 3 discloses a potassium salt of a fatty acid having an even number of carbon atoms, an amphoteric surfactant, an acylmethyltaurine-type anionic surfactant, and polyoxyethylene fatty acid glyceryl. A skin cleanser composition has been proposed containing a nonionic surfactant of the type. In order to efficiently remove the sunscreen, it is preferable that the cleansing agent is blended 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 smoothness on the skin during bathing. However, after sea bathing, when sunscreens are often used, there is a problem that the spreadability and slipperiness on the skin are lower than those during bathing due to the influence of salt adhering to the skin. Therefore, when a cleansing agent containing a fatty acid salt is blended with a sunscreen agent in a concentrated state after bathing in the sea, it is difficult to efficiently remove the sunscreen agent due to poor spreadability and slipperiness on the skin. there were.

JP 2017-214327 A JP 2012-167035 A JP 2014-76977 A

Thus, it has been known that both low-temperature stability and latherability can be achieved by adding phenoxyethanol or dihydric alcohol to a liquid cleanser containing fatty acid salt soap. It has also been known that the cleansing effect is improved by adding a nonionic surfactant or the like to a cleansing agent containing a fatty acid salt. However, the current situation is that no liquid cleansing composition has been developed which has excellent spreadability and slipperiness even on the skin to which seawater has adhered, is easy to foam even on the face, and has excellent cleansing power.
An object of the present invention is to provide a liquid cleanser that spreads well and slides well even on the skin to which seawater has adhered, is easy to foam even on the face, and has excellent cleansing power.

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by selecting specific materials and setting the blending ratio within a specific range, a liquid cleansing agent that exhibits desired effects can be obtained. The present inventors have found that it is possible to achieve the present invention.
That is, the present invention is a liquid detergent characterized by containing the following component (A), component (B), component (C), component (D) and water.
(A) 6 to 24% by mass of a potassium salt of a saturated fatty acid having an even number of carbon atoms and having 12 to 16 carbon atoms
(B) 0.001 to 0.5% by mass of a potassium salt of a saturated fatty acid having an odd number of carbon atoms of 13 to 17 carbon atoms
(C) 0.2 to 10% by mass of an amphoteric surfactant
(D) 0.5 to 12% by mass of a dihydric alcohol having 3 to 6 carbon atoms

The liquid cleansing agent of the present invention exhibits excellent spreadability and slipperiness even on the skin to which seawater has adhered, is easy to lather on the face, and has excellent cleansing power.

Embodiments of the present invention will be described below.
The liquid detergent of the present invention contains at least the following components (A), (B), (C), (D) and water. Each component will be described below.
In this specification, the numerical range specified using the symbol "-" includes both ends (upper limit and lower limit) of "-". For example, "2 to 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 and having 12 to 16 carbon atoms (also referred to herein as an "even saturated fatty acid"). are potassium salts of 12, 14, 16 saturated fatty acids.
The potassium salt of saturated fatty acid to be blended in the liquid detergent of the present invention may be previously prepared as a potassium salt of even-numbered saturated fatty acid prior to blending. may be mixed.

The even-numbered saturated fatty acid may be a single substance or a mixture, and specifically includes a single saturated fatty acid of one of lauric acid, myristic acid and palmitic acid, or a mixed fatty acid in which two or more kinds are combined. be done. The potassium salt of even-numbered saturated fatty acid is preferably a mixture of saturated fatty acid potassium salts from the viewpoint of foam volume and foam quality.

Liquid cleansers are generally made into systems containing free fatty acids (superfat). In the present invention, the even-saturated fatty acid may be added to the liquid detergent system after the potassium salt of the even-saturated fatty acid is prepared. 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 to the fatty acid.

The content of component (A) is 6 to 24% by mass, preferably 8 to 22% by mass, more preferably 10 to 20% by mass, relative to the total amount of the detergent. If the content of component (A) is too low, foaming and cleansing power on the face may not be sufficient. be.

<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 carbon atoms (also referred to herein as an "odd-even saturated fatty acid"). It is a potassium salt of number 13, 15, 17 saturated fatty acids.

Examples of fatty acids used in component (B) include tridecanoic acid, pentadecanoic acid and heptadecanoic acid, preferably pentadecanoic acid and heptadecanoic acid, and more preferably containing at least pentadecanoic acid and heptadecanoic acid.

When pentadecanoic acid and heptadecanoic acid are used in combination, the mass ratio of pentadecanoic acid/heptadecanoic acid is preferably 1/30 to 30/1, more preferably 1/10 to 10/1, and 1/5. ~5/1 is more preferred, and 1/3 to 3/1 is particularly preferred. When the mass ratio is within the above range, it is more preferable in terms of spreadability and slipperiness on the skin and ease of lathering on the face.

Further, when component (B) contains pentadecanoic acid and heptadecanoic acid, the total content of pentadecanoic acid and heptadecanoic acid is preferably 95 to 100% by mass with respect to the total amount of component (B). More preferably, it is up to 100% by mass. When the content of pentadecanoic acid and heptadecanoic acid is within the above range, spreadability and smoothness on the skin, and ease of lathering on the face can be obtained in a well-balanced manner.

The content of 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%, based on the total amount of the detergent. .3% by weight, particularly preferably 0.02 to 0.2% by weight. If the content of component (B) is too low, the spreadability and smoothness on the skin may be reduced, and the foaming and cleansing power on the face may be insufficient. It may be economically disadvantageous because the effect commensurate with the amount is not observed.

<Component (C): amphoteric surfactant>
Component (C) used in the present invention is an amphoteric surfactant. Examples of amphoteric surfactants include betaine alkyldimethylaminoacetate, betaine amidopropyldimethylaminoacetate, and alkylaminodicarboxylates. Among these, betaine amidopropyldimethylaminoacetate and alkylaminodicarboxylate are preferred 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 component (C) is 0.2 to 10% by mass, preferably 1 to 8% by mass, more preferably 1.5 to 6% by mass, relative to the total amount of the detergent. If the content of component (C) is too low, foaming and cleansing power on the face may be insufficient, and if the content is too high, spreadability and smoothness on the skin may be reduced. .

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

The content of component (D) is 0.5 to 12% by mass, preferably 2 to 10% by mass, more preferably 4 to 8% by mass, relative to the total amount of the detergent. If the content of component (D) is too low, the spreadability, slipperiness and cleansing power on the skin may be reduced. .

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

The water content is 80% by mass or more, preferably 85 to 100% by mass, and more preferably 90 to 90% by mass, based on the total amount of the cleaning agent. It is appropriately set so as to be 99% by mass.

<Other additive ingredients>
The liquid cleansing agent of the present invention may further contain general components used in cosmetics and cleansing agents as additive components, in addition to the components (A) to (D) and water described above.
Other additive components include, for example, oils and fats such as vegetable oils and animal oils; fatty acids; pH adjusters; antioxidants; sequestering agents; The content of other additive components is preferably 15% by mass or less, more preferably 10% by mass or less, relative to the total amount of the detergent.

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

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples.
<Examples 1 to 11, Comparative Examples 1 to 2>
Liquid detergents shown in Table 3 (Examples 1 to 11) and Table 4 (Comparative Examples 1 and 2) were prepared with the compositions of potassium salts of saturated fatty acids shown in Tables 1 and 2, and evaluated by the following methods.
In Tables 3 and 4, the numerical value of each component indicates the content (% by mass) relative to the total amount of the detergent.

The following raw materials were used.
・ Lauric acid: Reagent special grade (manufactured by Tokyo Chemical Industry Co., Ltd.)
・Myristic acid: Reagent special grade (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Palmitic acid: Reagent special grade (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Pentadecanoic acid: Reagent special grade (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Heptadecanoic acid: Reagent special grade (manufactured by Tokyo Chemical Industry Co., Ltd.)
・ Sodium laurylaminodiacetate: Nissan Anon LA (manufactured by NOF Corporation)
Coconut oil fatty acid amidopropyl betaine: Nissan Anon (registered trademark) BDF-SF (manufactured by NOF Corporation)

<Evaluation method>
(1) Evaluation of smoothness on the skin after sea bathing A panel of 20 women aged 25 to 55 took 3 g of the liquid cleanser after sea bathing and applied it to the body using the following criteria. was evaluated.
2 points: When it is felt that the spreadability and slipperiness are very good.
1 point: When it was felt that the spreadability and slipperiness were slightly good.
0 points: When the spreadability and slipperiness were felt to be poor.

(2) Evaluation of foaming on the face A panel of 20 women between the ages of 25 and 55 who wore make-up took 3 g of the liquid cleanser in their hands, blended it with the make-up cosmetic, and then warmed it with 38°C lukewarm water. After wetting both hands with , foaming was evaluated according to the following criteria.
2 points: When it is felt that foaming is very easy and the foam has a sufficient thickness.
1 point: When it is felt that lathering is a little easy and the lather is a little thick.
0 points: when it is difficult to lather and the lather is felt to have no thickness.

(3) Evaluation of cleansing power Following (2) above, after rinsing with lukewarm water at 38°C, ease of makeup removal was evaluated according to the following criteria.
2 points: When it is felt that the make-up cosmetic is sufficiently removed.
1 point: When it is felt that the make-up cosmetic has come off to some extent.
0 points: When it was felt that the make-up cosmetic did not come off clearly.

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

All of the liquid cleansers of Examples 1 to 11 had good spreadability and smoothness on the skin after sea bathing, were easy to lather on the face, and had excellent 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 spreadability and slipperiness on the skin after sea bathing were poor, it was difficult to lather on the face, and the cleansing power was insufficient.
Comparative Example 2 contained glyceryl isostearate, but did not contain component (B). Therefore, the spreadability and slipperiness on the skin after sea bathing were poor, and lathering on the face was difficult.

<Example 12>
A liquid cleanser was prepared according to the formulation shown below, and evaluated in the same manner as in the above examples.
(A) 15% by mass of saturated fatty acid potassium salt A2 in Table 1
(B) 0.02% by mass of saturated fatty acid potassium salt B3 in Table 2
(C) sodium laurylaminodiacetate 1% by mass
(C) Coconut fatty acid amidopropyl betaine 1% by mass
(D) Propylene glycol 2% by mass
(D) dipropylene glycol 2% by mass
Water 71% by mass
(Other additive ingredients)
Potassium stearate 1 mass%
Sodium coconut oil fatty acid methyltaurate 2% by mass
Coconut fatty acid amidopropyl betaine 2% by mass
Lauric acid diethanolamide 1% by mass
Ethylene glycol distearate 1% by mass
Tetrasodium etidronate 0.2% by mass
Tetrasodium edetate 0.2% by mass
Polyquaternium-7 0.1% by mass
Polyquaternium-10 0.1% by mass
Polyquaternium-51 0.1% by mass
Perfume 0.28% by mass
Total compounding amount 100% by mass

The liquid cleanser of Example 12 had good spreadability and smoothness on the skin after sea bathing, was easy to lather on the face, and had excellent cleansing power.

Claims (1)

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