JP4826791B2 - Skin cleanser composition - Google Patents

Description

  The present invention relates to a skin cleanser composition, and more specifically, a skin cleanser composition that suppresses low-temperature storage stability, foaming, moist feeling of skin after washing, and increase in transdermal moisture transpiration after washing. It is about.

  Conventionally, in skin cleansing compositions such as body soaps, higher fatty acid salts, alkyl ether sulfate esters, monoalkyl phosphate esters, amino acid surfactants, and the like are used as main cleaning components. Among them, higher fatty acid salts are often used in terms of foaming, detergency, and price, but there is a problem that crystal precipitation is likely to occur over time at low temperatures, and the moist feeling of the skin after washing and after washing There has been a demand for suppression of increase in transdermal moisture transpiration. In addition, the following is mentioned as a prior art document relevant to this invention.

JP 2003-82387 A JP 2006-241330 A Japanese Patent Laid-Open No. 2006-160674

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a skin cleansing composition that suppresses low-temperature storage stability, foaming, moist feeling of the skin after washing, and increase in the amount of transdermal moisture transpiration after washing. And

  As a result of intensive studies to achieve the above object, the present inventor has (A) a specific amount of a fatty acid salt, (B) a specific amount of an amidoamine surfactant, and (C) a branched fat having 12 to 30 carbon atoms. In combination with a group alcohol, it has been found that foaming is good, low-temperature storage stability is improved, moist feeling of the skin after washing, and increase in the amount of transdermal moisture transpiration after washing can be suppressed. It has been reached.

Therefore, the present invention
[1]. (A) Fatty acid salt 1 mass% or more and less than 20 mass%, (B) Amidoamine type | mold surfactant 0.1-3 mass%, and (C) C12-C30 branched aliphatic alcohol are contained, It is characterized by the above-mentioned. A skin cleanser composition,
[2]. The skin cleansing composition according to [1], wherein the component (C) is isostearyl alcohol or octyldodecanol.

  ADVANTAGE OF THE INVENTION According to this invention, the skin cleansing composition which is excellent in low-temperature storage stability, foaming, and the moist feeling of the skin after washing | cleaning, and suppresses the increase in the transdermal moisture transpiration amount after washing | cleaning can be provided.

  The skin cleanser composition of the present invention comprises (A) 1% by weight or more and less than 20% by weight of a fatty acid salt, (B) 0.1 to 3% by weight of an amidoamine type surfactant, and (C) 12 to 30 carbon atoms. It contains a branched aliphatic alcohol.

The component (A) is a fatty acid salt and is not particularly limited as long as it is used in a normal cleaning composition, and can be used alone or in combination of two or more. Examples of the fatty acid salt include those represented by the following general formula (1).
R ¹ COOM (1)
(In the formula, R ¹ represents a linear or branched alkyl or alkenyl group having 5 to 21 carbon atoms, and M represents an alkali metal, alkaline earth metal, amine, ammonium, or amino acid.)

More specifically, in addition to saturated and unsaturated fatty acids having R ^{1 of 5} to 21 carbon atoms, coconut oil fatty acid, hydrogenated coconut oil fatty acid, palm oil fatty acid, hydrogenated palm oil fatty acid, beef tallow fatty acid, Examples include potassium salts such as hardened beef tallow fatty acid, sodium salts, fatty acid soaps such as triethanolamine salts, and ammonium salts. Among these, from the viewpoint of foaming, R ¹ is preferably 7 to 21 carbon atoms, and more preferably R ¹ is a saturated or unsaturated fatty acid salt having 11 to 15 carbon atoms. In addition, it is particularly preferable to use a fatty acid potassium salt from the viewpoint of suppressing the color tone and odor alteration during long-term storage and reducing precipitation at low temperatures. When the fatty acid salt is blended, the fatty acid soap itself may be blended, or the fatty acid and the alkali may be blended separately in the cleaning composition and neutralized.

  In the skin cleansing composition of the present invention, the proportion of laurate in the composition of (A) fatty acid salt is preferably 50% by mass or more, more preferably 60 to 80% by mass. If the proportion of laurate in the fatty acid salt is less than 50% by mass, the amount of foam at the time of washing may not be sufficiently obtained with a small amount of use, while the proportion of laurate in the fatty acid salt is 80% by mass. If it exceeds 50%, some people may feel irritation to the skin during and after washing. The fatty acid salt contained in the composition other than laurate is not particularly limited. However, since the foam quality at the time of washing is improved, a saturated fatty acid salt having 14 or more carbon atoms is used in the composition of the fatty acid salt. Is preferably 20 to 50% by mass, more preferably 30 to 50% by mass. When the ratio of the saturated fatty acid salt having 14 or more carbon atoms exceeds 50% by mass, precipitation may easily occur at low temperatures.

  (A) The compounding quantity of a fatty acid salt is 1 mass% or more and less than 20 mass% in a skin cleaning composition, and 2 mass% or more and less than 20 mass% are preferable. If it is less than 1% by mass, the amount of foam during use is too small, and the water-insoluble (C) branched aliphatic alcohol having 12 to 30 carbon atoms is difficult to dissolve, the moist feeling of the skin after washing, and the skin after washing Slightly inferior effect of increasing moisture transpiration. On the other hand, when the blending amount is 20% by mass or more, the moist feeling of the skin after washing and the effect of suppressing the increase in the amount of transdermal moisture transpiration after washing are inferior, the fatty acid salt is precipitated at low temperatures, and the storage stability is inferior.

  Component (B) is an amidoamine type surfactant, and examples thereof include those represented by the following general formula (2), which can be used alone or in combination of two or more.

（式中、Ｒ²は炭素数７〜２１のアルキル基又はアルケニル基であり、Ｒ²ＣＯとしては炭素数８〜２２のアシル基を構成し、Ｒ³は独立に炭素数１〜２のアルキル基であり、ｎは２〜３の整数である。）

(Wherein R ² is an alkyl group or alkenyl group having 7 to 21 carbon atoms, R ² CO is an acyl group having 8 to 22 carbon atoms, and R ³ is independently an alkyl group having 1 to 2 carbon atoms. And n is an integer of 2 to 3.)

The fatty acid constituting the acyl group having 8 to 22 carbon atoms is a linear or branched saturated or unsaturated fatty acid. Examples of such fatty acid include caprylic acid (octanoic acid), pelargonic acid (nonanoic acid), In addition to capric acid (decanoic acid), lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, behenic acid, oleic acid, linoleic acid, erucic acid, coconut oil fatty acid, beef tallow fatty acid, etc. Can do. Examples of the alkyl group having 1 or 2 carbon atoms represented by R ³ include a methyl group and an ethyl group. Preferred fatty acids constituting the acyl group of R ² CO are lauric acid, myristic acid, palmitic acid and stearic acid, n is 2 to 3, and R ³ is a methyl group.

  There is no restriction | limiting in particular in the method of manufacturing the amidoamine type surfactant represented by General formula (2), It can manufacture by arbitrary well-known methods. For example, a fatty acid or a derivative thereof is reacted with dimethylaminopropylamine, N, N-dimethylethylenediamine, N, N-diethylethylenediamine, N, N-dimethyltrimethylenediamine, N, N-diethyltrimethylenediamine, and an amide bond Can be obtained by generating

  (B) The compounding quantity of an amidoamine type surfactant is 0.1-3 mass% in a skin cleansing composition, Preferably it is 0.5-2 mass%. If it is less than 0.1% by mass, the stability at low temperature is not effective, and the moist feeling after washing and the effect of suppressing the increase in transdermal moisture transpiration after washing are inferior. On the other hand, if it exceeds 3% by mass, it will be difficult to dissolve in the composition and the low-temperature stability will be deteriorated, and it will become slippery during rinsing.

  Component (C) is a branched aliphatic alcohol having 12 to 30 carbon atoms and can be used alone or in combination of two or more. As the branched aliphatic alcohol having 12 to 30 carbon atoms, those having 14 to 22 carbon atoms are preferable. The branched aliphatic alcohol having 12 to 30 carbon atoms is not limited in the form of branching, and examples thereof include those represented by the following general formula (3).

（式中、Ｒ⁴及びＲ⁵は独立に一価炭化水素基であり、分子中の総炭素数は１２〜３０である。）

(In the formula, R ⁴ and R ⁵ are each independently a monovalent hydrocarbon group, and the total number of carbon atoms in the molecule is 12 to 30.)

This is an alcohol having a 2-alkylalkanol structure obtained by a Gerve reaction (condensation reaction) or a gerbet reaction of two primary alcohols. Due to the branched structure, it has a low freezing point and is a liquid component at room temperature. Specific examples include hexyl decanol, isostearyl alcohol, octyl decanol, octyl decanol, decyl tetradecanol and the like. In the general formula (3), R ⁴ is a monovalent hydrocarbon group having 8 to 10 carbon atoms. R ⁵ is preferably a monovalent hydrocarbon group having 6 to 8 carbon atoms, among which isostearyl alcohol and octyldodecanol are particularly preferable.

  (C) As for the compounding quantity of C12-C30 branched aliphatic alcohol, 0.1-2 mass% is preferable in a skin cleaning composition, More preferably, it is 0.5-2 mass%. If it is less than 0.1% by mass, the amount of foam may be too small during use. On the other hand, when the blending amount exceeds 2% by mass, the amount of foaming may be reduced, and when the solubilizing power is reduced under low temperature conditions, the branched aliphatic alcohol may be precipitated.

  The skin cleansing composition of the present invention can be blended with appropriately selected other components as long as the object of the present invention is not hindered. Other components can be appropriately selected from those usually used in liquid detergent compositions, such as water, oil, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, Acrylic resin dispersion, drugs such as vitamins, bactericides, preservatives, pH adjusters, antioxidants, sequestering agents, UV absorbers, animal and plant extracts or their derivatives, dyes, fragrances, pigments, inorganic powders, clays Examples thereof include water-insoluble polymer powders such as minerals, nylon and polyethylene.

  The skin cleansing composition of the present invention may be for face or body use, and the subject is not particularly limited as long as it is skin. Although there is no restriction | limiting in particular as a dosage form of the skin cleaning composition of this invention, Liquid form is preferable and pH (25 degreeC) has 8.5-11.0 being preferable. The container of the skin cleanser composition is not particularly limited, but is suitable for filling a former container in which the skin cleanser composition is discharged in a foam form because precipitation at low temperature is suppressed.

  There is no restriction | limiting in particular as a manufacturing method of the skin cleansing composition of this invention, According to the objective, it can select suitably. For example, it can be obtained by mixing the components (A) to (C), an optional component, and water (remainder). There is no restriction | limiting in particular as an apparatus which prepares a skin washing | cleaning agent composition, According to the objective, it can select suitably, The stirring apparatus provided with the several stirring blade (propeller, turbine, disper, etc.) which can mix with a shear force and the whole Is preferred. There is no restriction | limiting in particular as a raw material of the skin cleansing composition of this invention, According to the objective, it can select suitably. Moreover, each raw material may be used independently and the mixture containing each raw material may be used.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example. In the following examples, unless otherwise specified, “%” in the composition represents mass%, and the amount of each component in the table is an amount converted into a pure component.

[Examples 1-8, Comparative Examples 1-8]
The components shown in Tables 1 and 2 were uniformly mixed to prepare skin (body) cleaning compositions of Examples and Comparative Examples. The following evaluation was performed about the obtained skin (body) cleaning composition. The results are also shown in the table.

[Low temperature stability]
The skin cleansing composition was adjusted to an initial value of pH 10.6 (pH meter: HM-30G / manufactured by Toa Denpa Kogyo Co., Ltd., measured at 25 ° C.), filled in 50 mL of a hard transparent glass bottle, and stored at 5 ° C. for 1 month. Then, the following criteria were evaluated.
<Evaluation criteria>
A: Appearance is transparent and there is no precipitate.
○: Very slightly turbid but no precipitate.
Δ: Slightly cloudy with little precipitates.
X: Many precipitates are recognized.

[Bubbles]
Take 3 g of skin cleanser composition in a graduated beaker and add room temperature tap water to make 30 g. Mixer method (Brown Co., Ltd. hand blender MR5550MCA type 6 cm × 15 cm Wer mixer, rotary scale 12 (about 715 revolutions / The amount of foaming was evaluated as evaluated in 1). The experiment was performed three times, and the average value was calculated.

[Moist feeling after washing by sensory evaluation]
Ten women (special panelists) performed sensory evaluation on the moist feeling of the skin after 15 minutes after washing the inner skin of the forearm with a skin cleanser composition according to the following criteria. As a control product for evaluating moist feeling, the skin feel after applying 1 g of 1% aqueous solution of glycerin to the inner side of the forearm and drying for 10 minutes was evaluated.
<Evaluation criteria>
A: 8 or more people have a moist feeling stronger than the control product.
○: 6 to 7 people have the same moist feeling as the control product.
Δ: 4 to 5 people are weaker than the control product, but have a moist feeling
X: 3 or less people are considerably weaker than the control product, but have a moist feeling.

[Transdermal moisture transpiration]
It is known that when the skin protection component is excessively removed by the skin cleansing composition, the amount of transdermal moisture transpiration increases. When the skin barrier function is reduced and the amount of transdermal moisture transpiration is increased, a tingling sensation or irritability after washing may be felt.
Four 30-year-old male panelists washed the inner part of the upper arm for 1 minute with 3 g of a skin cleanser composition and acclimated for 30 minutes in an environment of temperature 20 ° C. and humidity 40%. (AS-TW2 ASAHI BIOMED) was used to measure the amount of transdermal moisture transpiration 5 times for each arm. Based on the average value of 5 times, the increase rate (%) after washing when the transdermal moisture transpiration value before washing was set to 100 was calculated based on the following formula. A result is shown by the average value of 4 persons.
Rate of increase (%) = [transdermal moisture transpiration after washing (average value of 5 times) −transdermal moisture transpiration before washing (average value of 5 times)] / transdermal moisture transpiration before washing (5 Times average) x 100
It can be said that a skin cleanser composition having a low increase rate of transdermal moisture transpiration compared to before washing is a mild cleansing agent for the skin.

＊１：エコノールＰＡ−１８（三洋化成製）
＊２：ＳＷＡＮＯＬアミドアミンＳ（日光ケミカルズ製）
＊３：リソノール１８ＳＰ（高級アルコール工業製）
＊４：リソノール２０ＳＰ（高級アルコール工業製）

* 1: Econol PA-18 (manufactured by Sanyo Chemical)
* 2: SWANOL Amidoamine S (Nikko Chemicals)
* 3: Lisonol 18SP (manufactured by Higher Alcohol Industry)
* 4: Lisonol 20SP (manufactured by Higher Alcohol Industry)

Claims (2)

  (A) Fatty acid salt 1 mass% or more and less than 20 mass%, (B) Amidoamine type | mold surfactant 0.1-3 mass%, and (C) C12-C30 branched aliphatic alcohol are contained, It is characterized by the above-mentioned. A skin cleanser composition.   The skin cleansing composition according to claim 1, wherein the component (C) is isostearyl alcohol or octyldodecanol.