JP7234746B2 - cream cleanser - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cream 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 cream cleansers are widely used as general skin cleansers. Fatty acids constituting soaps blended in cream cleansers 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% unsaturated fatty acids. It contains about % by mass. 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 creamy cleansers, creamy cleansers using only saturated fatty acids have been proposed. Although discoloration and odor deterioration can be improved by this, there are problems such as poor spreading during use and separation at high temperatures depending on the fatty acid content. In order to solve these problems, Patent Document 1, for example, proposes a cream cleanser containing a saturated fatty acid having an even number of carbon atoms, potassium hydroxide and glycerin.

On the other hand, in recent years, there has been an increasing need for simple skin care, and cream cleansers are required to remove make-up cosmetics and normal facial cleansing at the same time. In order to enhance the cleansing power, it is preferable to mix it with makeup cosmetics in a thick state, but in this case, it is necessary to add water and lather on the face. For example, in Patent Document 2, a cream detergent 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 is disclosed as a cream detergent having a cleansing effect. Skin cleansers have been proposed, but they lather poorly on the face.

JP 2015-24974 A JP 2012-167035 A

Thus, it has been known that adding glycerin or a nonionic surfactant to a cream cleanser containing a fatty acid salt soap improves the spreadability during use and improves the cleansing effect. However, at present, no creamy cleanser has been developed which spreads well when used, is easy to lather on the face, has excellent cleansing power, and has high storage stability.
An object of the present invention is to provide a creamy cleanser that spreads well when used, is easy to foam even on the face, has excellent cleansing power, and has high storage stability.

The inventors of the present invention have made intensive studies to solve the above problems, and as a result, have found that a creamy cleanser that exhibits desired effects can be produced by selecting specific materials and setting their mixing ratios within specific ranges. The present inventors have found that it can be obtained, and have completed the present invention.
That is, the present invention is a cream cleanser characterized by containing the following component (A), component (B), component (C), component (D) and water.
(A) 30 to 45% by mass of a potassium salt of a saturated fatty acid having an even number of carbon atoms and having 12 to 18 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) 0.1 to 5% by mass of glyceryl stearate or sorbitan stearate
(D) 4 to 34% by mass of glycerin or diglycerin

The creamy detergent of the present invention preferably further contains (E) 0.1 to 5% by mass of sodium polyoxyethylene fatty acid amide ether sulfate represented by formula (I).
_RCONH ( _CH2CH2O )n- _SO3Na (I)
(R is an alkyl group having 7 to 17 carbon atoms, and n is an integer of 2 to 10.)

According to the cream cleanser of the present invention, the effects of good spreadability during use, easy lathering even on the face, excellent cleansing power, and high storage stability can be obtained.

Embodiments of the present invention will be described below.
The creamy cleanser 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 18 carbon atoms (also referred to herein as an "even saturated fatty acid"). are potassium salts of 12, 14, 16, 18 saturated fatty acids.
The potassium salt of saturated fatty acid to be blended in the creamy cleanser of the present invention may be a potassium salt of even-numbered saturated fatty acid before blending. An alkaline agent may also be added.

The even-numbered saturated fatty acid may be a single substance or a mixture, and specifically, a single saturated fatty acid selected from lauric acid, myristic acid, palmitic acid, and stearic acid, or a mixture of two or more types. A fatty acid is mentioned. 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.

In cream cleansers, 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 cream cleanser system after the potassium salt of the even-saturated fatty acid is prepared, or the amount of the alkaline agent added when reacting the even-saturated fatty acid with the alkaline agent. may be reduced to leave unreacted free fatty acids. At this time, the content of the alkali agent such as potassium hydroxide is preferably 0.7 to 0.9 equivalents to the fatty acid.

The content of component (A) is 30 to 45% by mass, preferably 32 to 43% by mass, more preferably 34 to 41% by mass, relative to the total amount of the detergent. If the content of component (A) is too low, the foaming and cleansing power on the face may not be sufficient, and the stability may be low. 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. A mass ratio within the above range is more preferable in terms of spreadability during use 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, it is possible to obtain a well-balanced spreadability during use and ease of lathering on the face.

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 during use may be low, and the foaming and cleansing power on the face may be insufficient. It may not be effective and may be economically disadvantageous, and in some cases, the spreadability during use may be reduced.

<Component (C): Glyceryl Stearate or Sorbitan Stearate>
Component (C) used in the present invention is glyceryl stearate or sorbitan stearate. Glyceryl stearate is a monoester of glycerin and stearic acid, and sorbitan stearate is a monoester of sorbitan and stearic acid. Glyceryl stearate and sorbitan stearate may be used alone or in combination.

The content of component (C) is 0.1 to 5% by mass, preferably 0.5 to 4.5% by mass, more preferably 1 to 4% by mass, relative to the total amount of the detergent. If the content of component (C) is too low, the cleansing power may be insufficient and the stability may be lowered.

<Component (D): glycerin or diglycerin>
Component (D) used in the present invention is glycerin or diglycerin. Glycerin can be produced by a method of purifying an aqueous solution obtained by hydrolyzing fats and oils by distillation or the like. Diglycerin can be produced by dehydrating and condensing glycerin and purifying it. Glycerin and diglycerin may be used alone or in combination.

The content of component (D) is 4 to 34% by mass, preferably 10 to 32% by mass, more preferably 15 to 30% by mass, relative to the total amount of the detergent. If the content of component (D) is too low, spreadability during use and lathering on the face may be poor, and if the content is too high, stability may be low.

<Water>
The cream cleanser 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.

<Component (E): Polyoxyethylene fatty acid amide ether sodium sulfate>
For the purpose of further improving the cleansing power of the creamy cleanser of the present invention and making it easier to lather on the face, the creamy cleanser of the present invention contains sodium polyoxyethylene fatty acid amide ether sulfate represented by the following formula (I) as component (E). It is more preferable to contain

_RCONH ( _CH2CH2O )n- _SO3Na (I)
(R is an alkyl group having 7 to 17 carbon atoms, and n is an integer of 2 to 10.)

Fatty acids constituting the acyl group of formula (I) include single fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid, and mixed fatty acids such as coconut oil fatty acid. Among these, coconut oil fatty acid is preferred. The added mole number n of ethylene oxide in the formula (I) is an integer of 2-10, preferably an integer of 3-6. If n is too small, the skin irritation may become strong, and if n is too large, the foamability may decrease.

When the creamy cleanser of the present invention contains component (E), the content of component (E) is preferably 0.1 to 5% by mass, more preferably 0.5 to 5% by mass, based on the total amount of the cleanser. 4.5% by weight, particularly preferably 1 to 4% by weight. When the content of component (E) is within the above range, it is more preferable in terms of spreadability during use, foaming on the face, and cleansing power.

<Other additive ingredients>
The creamy cleanser of the present invention may further contain common ingredients used in cosmetics and cleansers as additive components, in addition to the components (A) to (E) 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 creamy 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), glyceryl stearate as component (C), glycerin as component (D), component (E) Polyoxyethylene (4 mol) sodium coconut oil fatty acid amide ether sulfate is mixed with water and the like, heated to mix uniformly, and then stirred and cooled to around room temperature to obtain the creamy cleanser of the present invention. can be manufactured.

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples.
<Examples 1 to 12, Comparative Examples 1 to 2>
Creamy detergents shown in Table 3 (Examples 1-12) and Table 4 (Comparative Examples 1-2) 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.

In addition, 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.)
・Stearic 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.)
・ Glyceryl stearate: Monogly MB (manufactured by NOF Corporation)
・ Sorbitan stearate: Nonionic SP-60R pellets (manufactured by NOF Corporation)
・ Glycerin: RG-S (manufactured by NOF Corporation)
・ Diglycerin: Unigly G-2 (manufactured by NOF Corporation)
· Polyoxyethylene (4 mol) sodium coconut oil fatty acid amide ether sulfate: Sanamide C-3 (manufactured by NOF Corporation)

<Evaluation method>
(1) Evaluation of spreadability during use A panel of 20 women between the ages of 25 and 55 who wore make-up, wet both hands with lukewarm water at 38°C, took 1 g of the cream cleanser, and spread it over the entire palm. , spreadability when blended with make-up cosmetics was evaluated according to the following criteria.
2 points: When it is felt that the spreadability is very good.
1 point: When it is felt that the spreadability is slightly good.
0 points: When the spreadability is felt to be poor.

(2) Evaluation of foaming on the face Following (1) above, after blending with the make-up cosmetic, wet both hands again with lukewarm water at 38 ° C. and then foaming on the face according to the following criteria. made an evaluation.
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 was clearly inferior in removal.

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 35 or more ○: Total score is 30 or more and less than 35 △: Total score is 20 or more and less than 30 ×: Total score is less than 20

(4) Evaluation of stability The state after static storage at 40°C for 1 month was confirmed, and the stability was determined as follows.
○: Separation was not observed.
x: Separation was observed.

All of the cream cleansers of Examples 1 to 12 spread well during use, were easy to lather on the face, had excellent cleansing power, and had good stability.
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 during use was low, it was difficult to lather on the face, and the cleansing power was insufficient.
In Comparative Example 2, the content of the component (B) was too large, so the spreadability during use was low.

<Example 13>
A creamy cleanser was prepared according to the formulation shown below, and evaluated in the same manner as in the above examples.
(A) 40% 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) glyceryl stearate 1% by mass
(C) Sorbitan stearate 1% by mass
(D) glycerin 20% by mass
(D) diglycerin 5% by mass
Water 25% by mass
(Other additive ingredients)
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 2% 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 creamy cleanser of Example 13 spread well during use, was easy to lather on the face, and had excellent cleansing power.

Claims (2)

A cream cleanser characterized by containing the following component (A), component (B), component (C), component (D) and water.
(A) 30 to 45% by mass of a potassium salt of a saturated fatty acid having an even number of carbon atoms and having 12 to 18 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) 0.1 to 5% by mass of glyceryl stearate or sorbitan stearate
(D) 4 to 34% by mass of glycerin or diglycerin 2. The cream cleanser according to claim 1, further comprising (E) 0.1 to 5% by mass of sodium polyoxyethylene fatty acid amide ether sulfate represented by formula (I).
_RCONH ( _CH2CH2O )n- _SO3Na (I)
(R is an alkyl group having 7 to 17 carbon atoms, and n is an integer of 2 to 10.)