JP3405056B2 - Transparent soap composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent soap composition having a good moisturizing effect and good transparency and solid physical properties.

[0002]

2. Description of the Related Art Conventionally, solid transparent soaps having a high aesthetic appearance have been widely used not only as soaps for gifts but also as soaps for washing the face of women.

Conventional transparent soaps, like general non-transparent solid soaps, are fatty acid soaps (fatty acid alkali metal salts) obtained by saponifying raw material fats such as beef tallow and coconut oil with caustic soda, and ethanol or glycerin. Approximately 80 with stirring by adding a clearing agent such as polyhydric alcohol and sugar
After being heated at ℃, it is manufactured through a process of cooling, solidifying and drying.

By the way, polyhydric alcohols used as a clarifying agent, such as glycerin, are also known as a general moisturizing agent component, but when incorporated in transparent soap, they are easily washed at the time of use. To be dropped,
It is not possible to impart sufficient moisturizing effect to transparent soap.
Therefore, when such a transparent soap is used as a facial cleansing soap for women, it is strongly demanded to further improve the moisturizing effect of the transparent soap on the skin.

[0005]

However, when a generally known moisturizing agent is added to transparent soap,
For example, there are problems that the transparency is lowered, the solubility in water or hot water is very likely to collapse, and the soap hardness is insufficient in a drying step during the production of transparent soap.

The present invention is intended to solve the problems of the prior art as described above, and it is an object of the present invention to provide a transparent soap composition having a good moisturizing effect and having good transparency and solid physical properties. To aim.

[0007]

The present inventors have found that the above object can be achieved by blending a specific carboxylic acid derivative as a moisturizing agent in transparent soap, and have completed the present invention. It was

That is, the present invention provides the following component (A),
(B) and (C): (A) fatty acid soap; (B) polyhydric alcohol or saccharide (C) carboxylic acid derivative represented by the following formula (1) or salt thereof

[0009]

[Chemical 2] (In the formula, RCO is a linear or branched acyl group having 6 to 22 carbon atoms, A is a methyl group or a hydrogen atom, p
Is an integer of 1 to 3. ) Is contained, The transparent soap composition characterized by the above-mentioned is contained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The transparent soap composition of the present invention contains a fatty acid soap as the component (A). As such a fatty acid soap, various fatty acid soaps can be used, but it is preferable that the fatty acid constituting the fatty acid soap has 8 to 22 carbon atoms. The fatty acid may be linear, branched, saturated or unsaturated, and may be used alone or in combination of two or more. For example, beef tallow, animal fats such as sheep oil, coconut oil, palm kernel oil, soybean oil, olive oil, fatty acid mixture obtained by high-pressure decomposition of vegetable oils such as cottonseed oil and the like, or obtained by separating and purifying these Lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, palmitooleic acid,
Oleic acid, isomyristic acid, isopalmitic acid and isostearic acid can be used alone or in combination.

Examples of the counter ion of the fatty acid include alkali metals such as lithium, potassium and sodium, ammonium, and alkanolamines having a hydroxyalkyl group having 2 to 3 carbon atoms.

The blending amount of the component (A) fatty acid soap in the transparent soap composition can be appropriately determined depending on the type of the fatty acid soap and the desired soap hardness, but is preferably 20 to 50% by weight. , And more preferably 25 to 45% by weight.

The transparent soap composition of the present invention contains a polyhydric alcohol or a saccharide as the component (B). These function as a clarifying agent and are the same as those used in conventional transparent soaps. Here, examples of the polyhydric alcohol include glycerin and sorbitol. Moreover, sugar etc. can be mentioned as a saccharide.

These polyhydric alcohols or saccharides may be used alone or in combination. Further, the blending amount thereof can be appropriately determined depending on the content of the fatty acid soap used in the transparent soap composition of the present invention,
In order to make the fatty acid soap sufficiently transparent, it is preferably 10 to 20% by weight, more preferably 13 to 17% by weight.

Since the polyhydric alcohol or saccharide as the component (B) has a good moisturizing effect, it can impart a moisturizing effect to the transparent soap composition.

The transparent soap composition of the present invention has the formula (1) as the component (C).

[0018]

[Chemical 3] (In the formula, RCO is a linear or branched acyl group having 6 to 22 carbon atoms, preferably 12 to 18 carbon atoms, A is a methyl group or a hydrogen atom, and p is an integer of 1 to 3. )) Or a salt thereof. These function as a moisturizing agent and do not deteriorate transparency and solid physical properties (melting resistance and collapse resistance, soap hardness) when blended in a transparent soap composition. Also, when using transparent soap, most of it is washed off,
A slight amount that remains on the skin can give the skin a good moisturizing effect.

Examples of the carboxylic acid derivative as the component (C) include acyl lactic acid or acyl glycolic acid having p = 1 in the formula (1) and being acylated with an acyl group derived from a saturated or unsaturated fatty acid. Can be preferably used. Specifically, lauroyl lactic acid, isolauroyl lactic acid, myristolyl lactic acid, isomyristolyl lactic acid,
Oleoyl lactic acid, isooleoyl lactic acid, stearoyl lactic acid, isostearoyl lactic acid, lauroyl glycolic acid,
Examples thereof include isolauroyl glycolic acid, myristolyl glycolic acid, isomyristolyl glycolic acid, oleoyl glycolic acid, isooleoyl glycolic acid, stearoyl glycolic acid, and isostearoyl glycolic acid. These salts can also be used as the component (C), and examples thereof include alkali metal salts such as sodium, ammonium salts, amine salts and the like. Among these, isostearoyl lactic acid or its alkali metal salt,
Particularly, sodium salt can be preferably used.

The transparent soap composition of the present invention contains, in addition to the above-mentioned components (A), (B) and (C), the following components (D1), (D2), (D3) as a metal scavenger: (D4) and salts thereof: (D1) ethylenediaminetetraacetic acid (EDTA); (D2) 1-hydroxyethane-1,1-diphosphonic acid (HEDP); (D3) gluconic acid; (D4) diethylenetriaminepentaacetic acid (DTPA). It is preferable to mix at least one of As a result, Cu ions and F that accelerate the deterioration of transparency and discoloration due to the oxidation of fatty acid soap or the generation of offensive odor
It is possible to sequester metal ions such as e-ions in the transparent soap, and to impart good stability to the transparent soap.

Here, the EDTA of the component (D1) is represented by the formula (2)

[0022]

[Chemical 4] As the salt thereof, alkali metal salts such as sodium salt and potassium salt can be mentioned as preferable examples. Here, EDTA or a salt thereof may be used alone or in combination of two or more kinds. Further, the amount thereof can be appropriately determined depending on the unsaturated fatty acid content and the amount of impurity metal ions contained in the fatty acid soap used in the transparent soap composition of the present invention, but the fatty acid soap is sufficiently stabilized. For this, preferably 0.01
˜1.0 wt%, more preferably 0.05 to 0.3 wt%.

The HEDP of the component (D2) has the formula (3)

[0024]

[Chemical 5] Preferred examples of the salt of the compound are alkali metal salts such as sodium salt and potassium salt. Here, HEDP or a salt thereof may be used alone or in combination of two or more kinds. Further, the blending amount can be appropriately determined according to the unsaturated fatty acid content and the amount of impurity metal ions contained in the fatty acid soap used in the transparent soap composition of the present invention, but the fatty acid soap is sufficiently stabilized. For this, preferably 0.01
~ 2.0 wt%, more preferably 0.1-1.0 wt%
Is.

Gluconic acid as the component (D3) has the formula (4)

[0026]

[Chemical 6] Preferred examples of the salt of the compound are alkali metal salts such as sodium salt and potassium salt. Here, gluconic acid or its alkali metal salt may be used alone or in combination of two or more kinds. The blending amount thereof can be appropriately determined according to the unsaturated fatty acid content contained in the fatty acid soap, the amount of impurity metal ions, etc., but is preferably 0.01 to 2.0% by weight, more preferably 0.1. Is about 1.0% by weight.

DTPA of the component (D4) has the formula (5)

[0028]

[Chemical 7] Preferred examples of the salt of the compound are alkali metal salts such as sodium salt and potassium salt. Here, DTPA or a salt thereof may be used alone or in combination of two or more kinds. The amount thereof can be appropriately determined according to the unsaturated fatty acid content and the amount of impurity metal ions contained in the component (A) fatty acid soap, but is preferable for sufficiently stabilizing the fatty acid soap. Is 0.01 to 1.0% by weight, more preferably 0.05 to 0.3% by weight.

Among the above-mentioned components (D1) to (D4), HEDP of the component (D2) or a salt thereof (especially an alkali metal salt) and DTPA of the component (D4) or a salt thereof (especially an alkali metal salt). It is particularly preferable to use and. This makes it possible to further suppress the deterioration, discoloration, or offensive odor of the fatty acid soap of component (A).

The transparent soap composition of the present invention contains the above-mentioned component (A), component (B) and component (C), but in order to improve the foamability, higher fatty acid as component (E), It is preferable to add higher fatty acids such as coconut oil fatty acids having 12 to 18 carbon atoms. The amount of such higher fatty acid compounded is preferably 3 to 20% by weight, more preferably 5%.
~ 15% by weight.

Further, the transparent soap composition of the present invention may further contain dibutylhydroxytoluene as an antioxidant in order to further enhance the odor stability of the transparent soap. Here, among the isomers of dibutylhydroxytoluene, the formula (6)

[0032]

[Chemical 8] Those represented by are preferably used.

The compounding amount of dibutylhydroxytoluene is
The amount can be appropriately determined according to the unsaturated fatty acid content contained in the fatty acid soap, but preferably 1 to 1000 pp
m, more preferably 50 to 300 ppm.

The transparent soap composition of the present invention may further contain, in addition to the above-mentioned components, if necessary, other conventional skin cleansing agents, such as other moisturizers such as hyaluronic acid, higher alcohols and esters. , Oils such as silicone, fragrances, pigments,
An ultraviolet absorber, a bactericide, a preservative and the like can be contained.

The transparent soap composition of the present invention can be produced by a conventional method. For example, higher fatty acids, ethanol,
The polyhydric alcohol or saccharide of component (B) and water are mixed and dissolved by heating. Component (A) fatty acid soap (soap substrate), component (C) carboxylic acid derivative, and other components are added to this solution as needed, and they are sufficiently mixed and dissolved, and then cooled and solidified, Cut into a predetermined size and shape. Then, at room temperature, water and ethanol are gradually evaporated and dried for about 40 days. This gives a transparent soap composition.

As described above, since the transparent soap composition of the present invention contains the specific carboxylic acid derivative of the component (C) as a moisturizing agent, it has a good moisturizing effect and also has good transparency and solid content. It has physical properties.

[0037]

EXAMPLES The present invention will be specifically described below based on examples.

Examples 1 and 2 and Comparative Examples 1 and 2 Solid transparent soap compositions having the formulations shown in Table 1 were produced by a conventional method.

Next, the obtained transparent soap composition (dry product)
The moisturizing effect, transparency, odor stability, and solid physical properties were tested and evaluated as described below. The results obtained are shown in Table 1.

[Moisturizing Effect Test] A transparent soap composition was used, the face was washed with water at 25 ° C., and the condition of the face was sensory-evaluated 3 minutes after the face was wiped with a towel. At that time, the soap composition of Comparative Example 1 was used as a control and evaluated in the following four stages.

[0041] ◎: When it has a very moisturizing feeling compared to the control ○: When there is a slightly moisturizing feeling compared to the control △: When there is almost no difference from the control ×: When moisturizing feeling is inferior to the control

[Transparency test] The transparent soap composition was stored at room temperature for 90 days, and the color after storage was visually observed. Then, the transparent soap composition of Example 1 before storage was evaluated as the following four grades as a control.

⊚: No difference from control ○: Almost no difference from control Δ: Slightly discolored and less transparent than control ×: Significantly discolored and transparent compared to control If it is decreasing

[Odor Stability Test] The transparent soap composition was stored at room temperature for 90 days, and the odor after storage was sensory evaluated. At that time, the transparent soap composition of Example 1 before storage was evaluated as the following four grades as a control.

[0045] ◎: When there is no difference from the control ○: When there is almost no difference from the control Δ: When there is a slight offensive odor compared to the control X: When there is a considerable offensive odor compared to the control

[Solid Physical Property Test] Ten professional panelists were asked to actually use the transparent soap composition for 10 days, and the solid physical properties such as cloudiness were visually evaluated. At that time, the transparent soap composition of Comparative Example 1 was used as a control, and the average of the evaluation results of 10 persons was evaluated in the following four levels.

[0047] ⊚: When the solid property is better than that of the control ○: When the solid physical properties are almost the same as those of the control Δ: When the solid physical properties are slightly inferior to the control X: When the solid physical properties are extremely inferior to the control

[0048]

[Table 1] (Blending amount: wt%) Example 1 Example 2 Comparative Example 1 Comparative Example 2 (Dry) (Dry) (Dry) (Dry) Ingredients Before After Before After Before Before After After Soap substrate * 1 30 38 30 38 30 38 30 38 95% Ethanol 20 0.1 20 0.1 20 0.1 20 0.1 Glycerin 8 10 8 10 8 10 8 10 Sugar 10 13 10 13 10 13 10 13 Water Balance Balance Balance Balance ISLNa * 2 0.05 0.06 0.05 0.06 − − − − EDTA * 3 − − 0.1 1.3 − − − − Glyceride monostearate − − − − − − 0.05 0.06 (Evaluation) Moisturizing effect − ○ − ◎ − Control − ○ Transparency − ○ − ○ − ○ − △ Odor stability − ○ − ○ − ○ − ○ Solid physical properties − ○ − ○ − Control − ○ * 1 Soap base (beef tallow / coconut oil = 80/20, moisture content 13%) * 2 Sodium isostearoyl lactate * 3 Ethylenediaminetetraacetic acid

From Table 1, the transparent soap compositions of Examples 1 and 2 using the moisturizing agent represented by the formula (1) have good moisturizing effect and have good transparency and solid physical properties. You can see that

On the other hand, in the case of the transparent soap composition of Comparative Example 1 in which not only the moisturizing agent represented by the formula (1) but also an ordinary moisturizing agent is used, it is found that the moisturizing effect is insufficient. Further, it can be seen that the transparent soap composition of Comparative Example 2 in which monostearic acid glyceride was used as a moisturizing agent instead of the moisturizing agent represented by the formula (1) is slightly discolored.

Example 3 A solid transparent soap composition having the formulation shown in Table 2 was produced by a conventional method.

Next, the obtained transparent soap composition (dry product)
The moisturizing effect, the transparency, the odor stability, and the solid property were evaluated in the same manner as in Example 1. As a result, favorable results equal to or higher than those in Examples 1 and 2 were obtained for all evaluation items.

[0053]

[Table 2] * 1, * 2 Same as Table 1 * 4 1-Hydroxyethane 1,1-diphosphonic acid * 5 Diethylenetriaminepentaacetic acid

Example 4 A solid transparent soap composition having the formulation shown in Table 3 was produced by a conventional method.

Next, the obtained transparent soap composition (dry product)
The moisturizing effect, the transparency, the odor stability, and the solid property were evaluated in the same manner as in Example 1. As a result, favorable results equal to or higher than those in Examples 1 and 2 were obtained for all evaluation items. Further, the transparent soap composition of the present example,
The soap composition was rich in foaming property as compared with the soap compositions of Examples 1 to 3.

[0056]

[Table 3] * 1, * 2, * 4 to * 5 Same as Table 1 and Table * 6 Higher fatty acid obtained from beef tallow / coconut oil mixture (= 80/20)

[0057]

Since the transparent soap composition of the present invention contains the specific carboxylic acid derivative of component (C) as a moisturizing agent, it has a good moisturizing effect and also has good transparency and solid physical properties. .

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Nozaki 2-1-3 Fumika, Sumida-ku, Tokyo Inside Kao Co., Ltd. (56) Reference JP-A-4-1297 (JP, A) JP-A-57 -3899 (JP, A) JP 58-117297 (JP, A) JP 1-190799 (JP, A) JP 58-179299 (JP, A) European Patent Application Publication 227321 (EP, A 1) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) C11D 9/26 C11D 17/00

Claims (8)

(57) [Claims] 1. The following components (A), (B) and (C): (A) fatty acid soap; (B) polyhydric alcohol or saccharide (C) carboxylic acid derivative represented by the following formula (1) or Its salt (In the formula, RCO is a linear or branched acyl group having 6 to 22 carbon atoms, A is a methyl group or a hydrogen atom, p
Is an integer of 1 to 3. ) Is contained, The transparent solid soap composition characterized by the above-mentioned. 2. The component (A) fatty acid soap is 20 to 50% by weight, and the component (B) polyhydric alcohol or saccharide is 10 to 2%.
The transparent solid soap composition according to claim 1, which contains 0% by weight and a carboxylic acid derivative of component (C) or a salt thereof in a proportion of 0.01 to 3% by weight. 3. The transparent solid soap composition according to claim 1, wherein the carboxylic acid derivative of the component (C) is a compound of p = 1 in the formula (1). 4. The transparent solid soap composition according to claim 1, wherein the carboxylic acid derivative of component (C) is isostearoyl lactic acid or an alkali metal salt thereof. 5. The transparent composition according to claim 4, wherein the carboxylic acid derivative of the component (C) is sodium isostearoyl lactate.
Bar soap composition. 6. The following components (D1) to (D4) or salts thereof: (D1) ethylenediaminetetraacetic acid; (D2) 1-hydroxyethane-1,1-diphosphonic acid; (D3) gluconic acid; (D4) ) Diethylenetriaminepentaacetic acid; The transparent solid soap composition according to any one of claims 1 to 5, containing at least one of the following. 7. 1-Hydroxyethane-of component (D2)
The transparent solid soap composition according to claim 6, wherein 1,1-diphosphonic acid or a salt thereof is used in combination with diethylenetriaminepentaacetic acid of the component (D4) or a salt thereof. 8. The transparent solid soap composition according to claim 1, which contains the following components (E) and (E) higher fatty acids.