JPH01254620A - Skin cleaning agent composition - Google Patents

Abstract

PURPOSE:To obtain the subject stable composition having good frothability and giving no slimy feeling and irritation to the skin, by compounding an N- acyl-N-alkylamino acid salt to a composition containing a fatty acid alkanolamine salt and a sulfosuccinic acid monoester salt at a specific ratio. CONSTITUTION:The objective composition can be produced by compounding (A) a composition containing a fatty acid alkanolamine salt of formula I (R is 7-17C alkyl or alkenyl; M is alkanolamine ion) and a sulfosuccinic acid monoester salt surfactant of formula II [R is R1O(CH2CH2O)m or R2CONH-CH2 CH2O- (R1 is 7-21C alkyl; m is 0 or 1)] with (B) an N-acyl-N-alkylamino acid salt of formula III (n is 1 or 2). The sum of the compounds of formula I and formula II is 5-40wt.%, the weight ratio of I/II is (20-1)/1 and that of III/(I+II) is 1/(20-3).

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a skin cleansing composition that foams well, gives less slimy feeling to the skin, causes less skin irritation, and has excellent composition stability.

(Prior Art) Skin cleansing agents have traditionally been required to have good lathering and low irritation to the skin, and are additionally required to have less slimy feeling on the skin.

Surfactants, which are the main components of skin cleansers, are mainly higher fatty acid salts and N-acylglutamic acid salts.

Monoalkyl phosphates, polyoxyethylene alkyl ether sulfate salts, etc. are used.

However, higher fatty acid salts have the disadvantage of being irritating to the skin, N-acyl glutamates have a slimy feel on the skin, and monoalkyl phosphates have poor lathering properties. Polyoxyethylene alkyl ether sulfate salts have poor skin irritation and may leave the skin feeling slimy. In this way, it is not satisfactory as a main ingredient in skin cleansers.

(Disclosure of the Invention) Therefore, in view of the above circumstances, as a result of intensive research, the present inventors have determined that a composition containing a specific higher fatty acid salt described later and a specific sulfosuccinic acid monoester salt described later in a constant weight ratio, A composition containing a specific N-acyl-N-alkyl amino acid salt at a constant weight ratio has good foaming properties, less slimy feeling on the skin, and less skin irritation (due to the stability of the composition). It was discovered that the composition is an excellent skin cleansing composition, leading to the present invention.

(Objective of the Invention) That is, the object of the present invention is to provide a skin cleansing composition that foams well, does not make the skin feel sticky, has little skin irritation, and has excellent composition stability.

(Structure of the Invention) The present invention provides an alkanolamine salt of a fatty acid represented by the following general formula (A) and a sulfosuccinic acid monoester salt represented by the following general formula (I3) as W + (the total amount of Bl is 5 to 40 Weight %, weight ratio of prison/(Bl is 20/1~
A composition containing an N-acyl-N-alkyl amino acid salt represented by the following general formula (q) at a ratio of Ω/[
This is a skin cleansing composition characterized in that it contains 1 weight of 1/20 to 1/3 of 1/20 to 1/3 of 1/20 to 1/3 of the following ingredients:

An alkanonylamine salt of a fatty acid represented by the general formula: COOM (wherein R is an alkyl group or alkenyl group having 7 to 17 carbon atoms, and M is an alkanolamine ion).

General formula B): [wherein R is R+ O+CHt CHt O+- or Rt C0NHCHz CHz O (R1 has 8 to 8 carbon atoms
22, R2 represents an alkyl group having 7 to 21 carbon atoms, and m represents an integer of 0 or I). ] A sulfosuccinic acid monoester salt-based surfactant.

General formula Ω: (In the formula, R is an alkyl group or alkenyl group having 7 to 17 carbon atoms, M is an alkanolamine ion, and n is 1 or 2
N-acyl-N represented by ), each representing an integer of
-Alkyl amino acid salts.

(Specific explanation of the structure) The general formula used in the present invention is an alkanolamine salt of a higher fatty acid, and is a monomer of fatty acids having 8 to 22 carbon atoms, such as lauric acid, myristic acid, isostearic acid, and oleic acid. In addition to fatty acids, alkanolamine salts of mixed fatty acids such as coconut oil fatty acid, palm kernel oil fatty acid, and beef tallow fatty acid are used.

Here, the alkanolamine salts include triethanolamine, jetanolamine, monoethanolamine, 2-
Indicates alkanolamine salts such as amino-2-methylpropanol monoisopropanolamine and diisopropanolamine.

Here, potassium salts and sodium salts have a problem of skin irritation due to their high pH. It is also inferior in terms of compatibility with other components.

Examples of the sulfosuccinic acid monoester salt surfactants represented by the above-mentioned general 2) include sodium sulfoconolate lauryl ester, sodium sulfosuccinate of lauryl alcohol ethoxylate (E, O, number of moles added: 1), sulfosuccinic acid monoester salt-based surfactants, etc. Examples include acid uroyl ethanolamide ester (sodium), sulfosuccinic acid coconut oil fatty acid ethanolamide ester (sodium), and the like.

On the other hand, polyoxyethylene sulfosuccinate (E, O, number of added moles: 3) lauryl ester - sodium sulfosuccinate, polyoxyethylene sulfosuccinate (E, O, number of added moles: 2) lauroyl ethanolamide ester - which does not correspond to general formula (I3) Sodium has a slightly less irritating effect, but it has poor foaming properties and leaves the skin feeling slimy, making it unsuitable as a skin cleanser.

The N-acyl-N-alkyl amino acid salts represented by the general formula (q) include lauroylsarcosine triethanolamine, coconut oil fatty acid sarcosine triethanolamine 1, N-lauroyl-N-methyl-β-alanine triethanolamine, N- Coconut oil fat-acid-N-methyl-β
-Alanine triethanolamine and the like. On the other hand, a stable composition cannot be obtained with the sodium salt of this product.

In the present invention, the general formula and general formula B) are
(At+Di is used so that it becomes 5 to 40% by weight, 9% by weight/β071 to 1/1. If At+Di is less than 5% by weight, foaming will be poor, and if it exceeds 40% by weight, foaming will be poor. It becomes difficult to obtain a stable composition.
If it exceeds /1, it will not be possible to obtain the reamy foaming necessary for a skin cleansing agent, and even if component (q) is added, a sufficiently mild composition will not be obtained.

On the other hand, when H/lBl is less than 1/l, the skin feels slimy. The N-acyl-N-alkyl amino acid salt of the general formula q is used so that the weight ratio of Ω/[+(0)] is 1/20 to 1/3. If (q/[+(Bl)) is less than 1/20, the synergistic effect of reducing irritation will not be achieved, and it will not be useful for stabilizing the composition.

When it exceeds 1/3, the skin feels slimy.

The skin cleansing composition of the present invention includes these W, fBl.

In addition to the essential component Ω, the following optional components may be blended within a range that does not affect the effects of the present invention. Anionic surfactants (sodium coconut oil fatty acid methyl taurate, sodium coconut oil fatty acid ethyl ester sulfonate, etc.), nonionic surfactants (coconut oil fatty acid jetanolamide, polyoxyethylene lauryl ether, etc.), amphoteric surfactants (lauryl dimethyl (amidoacetic acid betaine, etc.), humectants such as glycerin and propylene glycol, thickeners such as hydroxypropyl methylcellulose and cationized cellulose, preservatives, antioxidants, vitamins, plant extracts, animal and vegetable oils, chelating agents, fragrances 1 Examples include dyes. One or more of these optional components may be blended as required.

The pH of the skin cleansing composition of the present invention is preferably 6.5.
The wording has been adjusted to ~8.5.

The composition of the present invention can be applied to facial cleansers, body cleansers, shaving agents, hand cleaners, and the like.

(Example) Next, the present invention will be explained in more detail with reference to Examples. The effectiveness was measured using the following evaluation method.

■ Foaming power was measured according to the Ross Miles test method. however,
The sample was 2% aqueous '/& (Ca COs 50ppm
(using artificial hard water) and the temperature is 40°C.

◎・・・Extremely good foaming, foaming power of 250mm or more O: Good foaming, foaming power of 210 mm or more.

Less than 250mm △: Foaming is normal, foaming power is 170 mm or more.

Less than 210 mm ×...Poor foaming, foaming power less than 170 mm ■ Slimy feeling on the skin A face washing test was conducted by 20 female panelists and evaluated according to the following criteria.

○...Skin does not feel slimy, good Δ...Skin feels slimy 9 times ×...Skin feels slimy, bad■ Skin irritation (protein denaturation rate) test method Water-based high speed liquid Using chromatography, the ovalbumin denaturation rate when a sample was added to an ovalbumin pH 7 buffer solution at a sample concentration of 1% was measured using an absorption peak at 220 nm.

HO: Height of the 220 nm absorption peak of ovalbumin H3: 22 when the sample is added to the ovalbumin buffer solution
The criteria for evaluating the height of the 0 nm absorption peak was set as follows.

◎2 Ovalbumin denaturation rate less than 30% ○: Ovalbumin denaturation rate 30% or more and less than 60% Δ: Ovalbumin denaturation rate 60% or more and less than 80% ×: Ovalbumin denaturation rate 80% or more ■ Stability of the composition (appearance Test) The presence or absence of precipitation of crystals of the composition when stored in a constant temperature bath at 0°C for L months, and the presence or absence of separation of the composition when stored in a constant temperature bath at 40°C for one month were observed.

There is no precipitation or separation of crystals of the composition...River...O There is some precipitation of crystals of the composition or there is some separation.
.....DELTA. Crystals of the composition are precipitated or separated---nX [Examples 1 to 4. Comparative Examples 1 to 6] Body cleansers having the compositions shown in Table 1 were prepared in a conventional manner, and the effects of each essential component were examined. Table 1 shows the results.

[Example 5.6. Comparative Examples 7 to 9] Facial cleansers having the composition shown in Table 2 were prepared in a usual manner,
The effects of each essential ingredient were investigated and the results are shown in Table 2.

(Characteristics) As is clear from Examples 1 to G, using the components of the present invention,
Furthermore, all skin cleansing agents that satisfy a specific weight ratio exhibit poor performance.

On the other hand, in Comparative Example 4, which does not contain the essential component coconut oil fatty acid triethanolamine, the skin feels slimy and the stability of the composition is poor. Also, sulfosuccinic acid uryl ester =
Comparative Example 3, which does not contain sodium, has a slimy feeling on the skin and poor lathering.

Furthermore, Comparative Example 2, which did not contain laurylsarcosine triethanolamine, was inferior in skin irritation and composition stability. On the other hand, Comparative Example 5.6 which does not satisfy the specific weight ratio
In this case, the skin feels slimy or the stability of the composition is poor.

When components other than the essential components of the present invention are used, for example, polyoxyethylene sulfosuccinate (E, O, added mole number 3) sodium lauryl ester of Comparative Example 7, the foaming and slimy feeling on the skin are inferior. . Also, N- in Comparative Example 8
When coconut oil fatty acid-L-glutamic acid triethanolamine is blended, foaming occurs and the stability of the composition is poor.

Comparative Example 9 containing potassium myristate had poor skin irritation and could not achieve the object of the present invention.

(Effects of the Invention) As described above in Section 1, the present invention provides a useful skin cleansing composition with good foaming, less slimy feeling on the skin, and less skin irritation (and excellent stability of the composition). It is clear that the

Claims (1)

[Claims] (1) The alkanolamine salt of a fatty acid represented by the following general formula (A) and the sulfosuccinic acid monoester salt represented by the following formula (B) are combined in a total amount of (A) + (B) of 5 to 4
0% by weight, weight ratio of (A)/(B) is 20/1 to 1/1
A composition containing an N-acyl-N-alkyl amino acid salt represented by the following general formula (q) is added to a composition containing (C)/[
(A) + (B)] in a weight ratio of 1/20 to 1/3. An alkanolamine salt of a fatty acid represented by the general formula (A): RCOOM (wherein R is an alkyl group or alkenyl group having 7 to 17 carbon atoms, and M is an alkanolamine ion). General formula (B): ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [In the formula, R is R▲There are mathematical formulas, chemical formulas, tables, etc.▼ or R_2CONH-CH_2CH_2O-(R_1
is an alkyl group having 8 to 22 carbon atoms, and R_2 is an alkyl group having 7 to 22 carbon atoms.
21 alkyl group, m represents an integer of 0 or 1)
shows. ] A sulfosuccinic acid monoester salt-based surfactant. General formula (C): ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R is an alkyl group or alkenyl group having 7 to 17 carbon atoms, M is an alkanolamine ion, and n is 1 or 2
Indicate each integer. ) N-acyl-N represented by
-Alkyl amino acid salts.