JPH0641594B2 - Liquid cleaning agent for body - Google Patents

Description

The present invention relates to a liquid detergent for the body such as so-called body shampoo.

Conventionally, solid toilet soap has been widely used for washing the body. Toilet soap is extremely suitable for cleaning the body because it has a low tingling sensation and is easily washed off. However, toilet soaps have the drawback that foaming becomes poor or swelling as they are used. In order to solve this, liquid soap has been proposed, but none of them is sufficiently satisfactory such as poor solubility of soap and crystallization at low temperature. In addition, soap is highly alkaline, and the pH of the skin surface becomes too alkaline due to washing, which easily causes skin irritancy.To eliminate this, low irritant soaps such as amino acid soap and triethanol soap have been developed. It is expensive and has drawbacks such as poor foaming.

On the other hand, liquid body cleansing agents have become popular under the names such as body shampoo, but this is hard to foam because it does not have the foaminess of hair even when trying to foam directly on the body. Further, those containing an anionic surfactant as a main component have not been used as widely as toilet soaps because of the drawbacks such as strong sliminess during use and poor foam breakage.

Disadvantageously, the most highly foaming anionic surfactants generally have the highest removal of sebum, and therefore liquid cleansers for the body gently cleanse the skin and give little irritation.
It is necessary to devise it so that even if it is not given at all, it will have a high foaming property even partially.

The present inventors, as a result of conducting research in view of such a situation,
It has been found that the use of a specific combination of certain anionic surfactants eliminates the drawbacks of soap and conventional liquid detergents for the body based on conventional anionic surfactants, and has a low irritating effect on the skin. The present invention has been completed.

The liquid body cleaning agent of the present invention has the general formula (I) [Wherein R ¹ represents a C ₁₀ -C ₁₈ linear or branched alkyl group, an alkylaryl group, X represents hydrogen, an alkali metal, ammonium, or an alkanolamine, and A represents O.
X, or R ¹ O (CH ₂ CH ₂ O) l, and l is 0 to 1
The number of 5 is shown. 5 to 50% by weight of a phosphoric acid ester-based surfactant represented by the general formula (II) R ² O (CH ₂ CH ₂ O) ₂ CH ₂ CH ₂ SO ₃ M.
(II) [wherein R ² is a C _{10 to} C ₁₈ saturated or unsaturated alkyl group or a C _{8 to} C ₁₂ linear or branched alkyl group,
M is an alkali metal] 5 to 40% of a sulfonic acid type anionic surfactant represented by (C) general formula (III) [Wherein R ³ represents a C ₁₀ -C ₁₈ straight chain or branched chain saturated or unsaturated alkyl group. ] The amido betaine-based amphoteric surfactant represented by
The present invention provides a liquid detergent for personal use, which contains 0% of each.

As the phosphoric acid ester-based surfactant represented by the general formula (I) of the present invention, when the alkyl group R ¹ has less than 10 carbon atoms, the surface activity is lowered, and when the carbon number exceeds 18, the foaming power is increased. Is not improved, which is not preferable. Further, if l exceeds 15, the stability of the foam is impaired. Particularly preferred l is 0 to 5. The general formula (I) of the phosphoric acid ester indicates that it is a mixture of monoester and diester, but the weight ratio of the monoester and diester is preferably 6: 4 to 8: 2. This product can be easily obtained from a higher alcohol or a higher alcohol ethylene oxide adduct with phosphorus oxychloride or phosphorus pentoxide by a conventional method. The product obtained is a mixture containing 60-80% monoester and 20-40% diester. These phosphate ester type surfactants exert a mild action on the skin and produce a firm and creamy foam when used as a cleansing agent.

The second essential component of the present invention is R ² O (CH ² ) of the general formula (II).
₂ CH ₂ O) ₂ CH ₂ CH ₂ SO ₃ M and a sulfonic acid type anionic surfactant represented by the general formula (III) It is an amphoteric surfactant represented by. These surfactants are extremely mild to the skin, and exert the effects of improving the cedar properties of liquid detergents for the body, emulsification and dispersion of stains, and foamability.

The sulfonic acid type anionic surfactant represented by the general formula (II) is alcooxydiethoxyethyl sulfonic acid or alkylphenoxydiethoxysulfonic acid salt, and a higher alcohol or alkylphenol is reacted with triglycol dichloride, and then sulfurous acid is added. It can be produced by a method of sulfonating with salt. As a liquid cleanser for the body, this product has a mild effect on the skin and does not cause sliminess.

The amphoteric surfactant represented by the general formula (III) is coconut fatty acid amidopropyldimethylaminoacetic acid betaine,
It is usually obtained by reacting the reaction product of coconut fatty acid and aminopropyldimethylamine with monochloroacetic acid. This product has a mild effect on the skin and has an effect of improving the foaming property of the liquid detergent for body.

The content ratio of the sulfonic acid type anionic surfactant of the general formula (II) and the amphoteric surfactant of the general formula (III) is 8: 2.
It is 2: 8, preferably 6: 4 to 5: 5. The liquid detergent for body of the present invention may contain various other additives as long as the object of the present invention is not impaired.

As described above, the liquid detergent for body of the present invention is usually
It should be said that it has a proper detergency required for a cleansing agent, is mild and has no foam on the skin, has a high foaming property, and has a good defoaming effect, which is preferable.

Example Nurutsuki, foaming property, for the liquid detergent for body of the present invention,
As a result of investigating defoaming and defoaming, a good liquid detergent for urine body was obtained as shown in the table. The results are shown in the table. In Comparative Examples 1 to 4, good results such as nulliness, foamability, and foam breakage (not including any one component) were not obtained.

Regarding the safety of the skin, a 1.0% aqueous solution of the example was used as a sample by a human body occlusion patch test for 24 hours, and 20 healthy adult men and women were used as test subjects and the forearm was used as a patch site. As a result, there were no problems such as erythema and edema.

Claims (1)

[Claims] 1. A general formula (I) [Wherein R ¹ is a C _{10 to} C ₁₈ linear or branched alkyl group, an alkylaryl group, X is hydrogen, an alkali metal, ammonium or an alkanolamine, and A is OX or RO (CH ₂ CH ₂ O _2). ) 1 indicates a number from 0 to 15. 5 to 50% by weight of a phosphoric acid ester-based surfactant represented by the general formula (II) R ² O (CH ₂ CH ₂ O) ₂ CH ₂ CH ₂ SO ₃ M (II) [wherein R ² is a C _{10 to} C ₁₈ saturated or unsaturated alkyl group or a C _{8 to} C ₁₂ linear or branched alkylaryl group, and M is an alkali metal]. 5 to 4 agents
0 wt% General formula (III) [Wherein R ³ represents a C ₁₀ -C ₁₈ straight chain or branched chain saturated or unsaturated alkyl group. ] The amido betaine-based amphoteric surfactant represented by
Liquid cleaning agent for body characterized by containing 0% by weight of each