JP2017222602A - Solid soap composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid soap composition which can obtain a creamy and elastic foam quality suitable for washing the skin and a smooth feeling after washing and has a good permeation feeling of a skin lotion used after washing.SOLUTION: There is provided a solid soap composition which comprises 80 to 94.98 mass% of (a) component, 0.01 to 10 mass% of (b) component, 0.01 to 10 mass% of (c) component and 5 to 18 mass% of (d) component, where (a) component is a linear saturated aliphatic acid salt having 12 to 18 carbon atoms is (b) component is a polyglycerol having an average polymerization degree of 2 to 10, (c) component is lactic acid or a salt thereof and (d) component is water.SELECTED DRAWING: None

Description

  The present invention relates to a solid soap composition, and in particular, a creamy and elastic foam suitable for washing the skin is obtained, and a smooth feel is obtained after washing. The present invention relates to a solid soap composition having a good feeling.

  Solid soap has long been used to clean the face and body because of its rich foaming and refreshing feel. Solid soaps in recent years are required to have a creamy and elastic foam quality and to have a smooth feeling after washing (hereinafter also referred to as a smooth feeling).

Various proposals have been made to meet such demands. For example, Patent Document 1 proposes a solid soap composed only of a saturated fatty acid salt. However, in the solid soap of Patent Document 1, the foam quality is creamy and elastic, but the smooth feeling after washing is insufficient.
For example, Patent Document 2 proposes a solid detergent composition in which a specific fatty acid salt and a specific cationic polymer are combined and the surfactant other than the fatty acid salt is less than 1% by mass. However, in the solid detergent composition of Patent Document 2, there may be cases where the smooth feeling and foam quality after washing are not sufficient.

  Furthermore, skin care with a lotion is generally performed after washing with solid soap, but after washing with solid soap, a new problem has arisen that it is difficult to obtain a feeling of penetration of lotion.

JP 2000-160196 A JP 2008-31423 A

  In view of the above-mentioned problems, the present invention provides a creamy and elastic foam suitable for washing the skin, provides a smooth feel after washing, and has a good penetration feeling of the lotion used after washing. An object is to provide a solid soap composition.

  As a result of intensive studies in view of the above problems, the inventors of the present invention contain a specific fatty acid or a salt thereof, a polyglycerin having an average polymerization degree of 2 to 10, a lactic acid or a salt thereof, and water at a specific mass ratio. However, it has been found that it has excellent foam quality as a skin cleanser, provides a smooth feeling after washing, has a good permeation of the lotion used after washing, and is excellent in productivity.

That is, the present invention includes the following component (a) from 80 to 94.98% by mass, component (b) from 0.01 to 10% by mass, component (c) from 0.01 to 10% by mass, and (d). It is a solid soap composition containing 5 to 18% by mass of the components.
(A) Component: linear saturated fatty acid salt having 12 to 18 carbon atoms (b) component: polyglycerin (c) component having an average degree of polymerization of 2 to 10: lactic acid or lactate (d) component: water

  According to the solid soap composition of the present invention, a creamy and elastic foam suitable for washing the skin can be obtained, and a smooth feel can be obtained after washing, and the permeation feeling of the lotion used after washing is good. If it is, an effect is acquired.

Embodiments of the present invention will be described below.
The solid soap composition of the present invention comprises (a) component: linear saturated fatty acid salt having 12 to 18 carbon atoms, (b) component: polyglycerin having an average polymerization degree of 2 to 10, and (c) component: lactic acid or a salt thereof. , (D) component: contains water. Each component will be described below.

[(A) component]
The component (a) used in the present invention is a linear saturated fatty acid salt having 12 to 18 carbon atoms. Examples of the linear saturated fatty acid having 12 to 18 carbon atoms constituting the linear saturated fatty acid salt include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, hydroxystearic acid, and the like. Mixed saturated fatty acids such as beef tallow, palm oil, palm oil, palm kernel oil, olive oil, corn oil, sunflower oil, rapeseed oil, canola oil, soybean oil, castor oil, etc. Ethyl esters can also be used.
In consideration of further improvements in foam quality and feel after washing, the saturated fatty acid constituting the saturated fatty acid salt contains 10 to 40% by mass of lauric acid, 30 to 70% by mass of myristic acid, 5 to 5% of palmitic acid. It is preferably a mixed saturated fatty acid comprising 25% by mass and 0-30% by mass of stearic acid, and the total amount of lauric acid, myristic acid, palmitic acid and stearic acid is 96% by mass or more.

Examples of the linear saturated fatty acid salt having 12 to 18 carbon atoms include alkali metal salts and alkanolamine salts of the above linear saturated fatty acid having 12 to 18 carbon atoms. Examples of the alkali metal include sodium and potassium, and examples of the alkanolamine include methanolamine and ethanolamine. A linear saturated fatty acid salt having 12 to 18 carbon atoms can be obtained by a reaction between a mixed fatty acid composed of the above linear saturated fatty acid having 12 to 18 carbon atoms and a mixed alkali composed of a basic compound. As the basic compound, an alkali metal compound or an alkanolamine is used, and an alkali metal such as sodium hydroxide or potassium hydroxide is preferably used in terms of foaming and foam quality. In particular, sodium hydroxide and potassium hydroxide are used in combination from the viewpoint of solubility, and the mass ratio of sodium hydroxide / potassium hydroxide is preferably 99/1 to 50/50.
Further, from the viewpoint of foaming and foam quality, the mixed alkali / mixed fatty acid molar ratio is preferably 98/100 to 100/100, and more preferably 98/100 to 99/100.
As the component (a), one type can be used alone, or two or more types can be used in combination.

  Content of (a) component used by this invention is 80-94.98 mass%, Preferably it is 82-93 mass%, Most preferably, it is 84-91 mass%. When the content of the component (a) is too small, sufficient foam quality may not be obtained, and when the content is too large, productivity may be reduced.

[Component (b)]
The component (b) used in the present invention is polyglycerin having an average degree of polymerization of 2 to 10. From the viewpoint of a smooth feel and penetration, polyglycerin having an average degree of polymerization of 2 to 8 is preferable, polyglycerin having an average degree of polymerization of 2 to 4 is particularly preferable, and polyglycerin having an average degree of polymerization of 2 is more preferable. As the component (b), one type can be used alone, or two or more types having different average polymerization degrees can be used in combination. If the average degree of polymerization of polyglycerin is too high or too low, it may be unfavorable on a functional surface such as a smooth and smooth feel or penetration.

  Content of (b) component used by this invention is 0.01-10 mass%, Preferably it is 0.1-7 mass%, Most preferably, it is 0.3-5 mass%. (B) If the content of the component is too small, a smooth and smooth feel and a penetration feeling of the lotion may not be obtained. If the content is too large, the penetration feeling and productivity of the lotion will be reduced. There is a case.

[Component (c)]
The component (c) used in the present invention is lactic acid or lactate, and as the lactate, sodium salt or potassium salt is preferable.
Content of (c) component used by this invention is 0.01-10 mass%, Preferably it is 0.1-7 mass%, Most preferably, it is 0.3-5 mass%. When the content of the component (c) is too small, a smooth and smooth feel or penetration may not be obtained, and when the content is too large, the productivity may decrease.

[Component (d)]
(D) component used for this invention is water, and the thing generally used by cosmetics, a pharmaceutical, etc. can be used. For example, purified water specified by the Japanese Pharmacopoeia can be used.
Content of (d) component used by this invention is 5-18 mass%, Preferably it is 6-14 mass%, Most preferably, it is 8-12 mass%. If the content of the component (d) is too small, there may be a problem of disintegration or powdering due to a decrease in solidification properties. If the content is too large, stickiness, dullness, solidity deterioration, blocking, mold release There are cases where productivity and yield are reduced in terms of reduction. The moisture content is preferably adjusted depending on the drying conditions, but can also be adjusted by post-addition of water.

  In the solid soap composition of the present invention, the ratio of the content of the component (b) to the content of the component (c) [(b) / (c)] is preferably 0.25 to 4, particularly preferably 0.5. ~ 1. By adjusting (b) / (c) to the above range, the foam quality, smooth feeling, and the permeation feeling of the skin lotion after washing can be further improved.

  The solid soap composition of the present invention can be produced by a mechanical kneading method or a frame kneading method. In the mechanical kneading method, the soap chip obtained by the fatty acid neutralization method or the oil saponification method is blended with the component (b) and the component (c), and a pudder, a roll mill or the like, which is an apparatus usually used for the production of solid soap, is used. After use and homogenization, a soap bar can be obtained and molded by a stamping machine. In the frame kneading method, a fatty acid is dissolved, a solvent (for example, ethanol) that volatilizes after production and is substantially not included, is uniformly dissolved, and (b) component and (c) component are mixed and homogenized there. Pour into the formwork to solidify the soap. Then, it cuts into a suitable magnitude | size, it is made to dry, and after carrying out rough polishing, stamping, and finishing polishing, the solid soap of frame kneading can be obtained.

  In the solid soap composition of the present invention, components that are used as a blending component of a normal skin cleansing agent, for example, an oily raw material, a moisturizer, a surfactant, a thickener, within a range that does not impair the characteristics of the present invention. Antioxidants, chelating agents, fragrances, coloring agents, animal and plant extracts, and the like can be appropriately blended.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.

[Example 1]
In a 5 L double-arm kneading machine (manufactured by Irie Shokai Co., Ltd., PNV-5 type), 200 g of lauric acid, 400 g of myristic acid, 160 g of palmitic acid and 40 g of stearic acid were weighed and dissolved at 70 ° C. Neutralization was performed using a 28% aqueous solution of sodium hydroxide / potassium hydroxide (mass ratio: 9/1). The neutralization point was confirmed using a phenolphthalein indicator solution. Thereafter, 7 g of lauric acid was blended, and the molar ratio of mixed alkali / mixed fatty acid was 99/100. A soap base was obtained by drying with heating and stirring to about 10% by weight of water.
In the mixed fatty acid, lauric acid is 25% by mass, myristic acid is 50% by mass, palmitic acid is 20% by mass, and stearic acid is 5% by mass.

Prodder (manufactured by Nippon Kayoki Co., Ltd., with the addition of the components (b), (c), and other components shown in Table 1 at a predetermined ratio to the soap base and attaching a chinos-like metal fitting to the base. After being kneaded three times with a "mini soap prodder") and a roll mill (manufactured by IMEX Co., Ltd., "BR-150 type bench roll"), a soap bar was formed with a pudder, and this was molded with a stamping machine to obtain solid soap .
The loss on drying of the obtained solid soap was measured according to JIS-K3304, and this was defined as the content of water as component (d).
In addition, NaCl in Table 1 was blended as a soap base hardness adjuster.

The following compounds were used in Examples and Comparative Examples.
Polyglycerin (average degree of polymerization 2) ·· Sakamoto Pharmaceutical Co., Ltd., "Diglycerin # 801"
Polyglycerin (average degree of polymerization: 4), made by Sakamoto Pharmaceutical Co., Ltd., “Polyglycerin # 310”
28% alkaline aqueous solution: Reagent-grade basic compound was weighed at a mass ratio of 9/1, and distilled water was added to a concentration of 28% by mass.

  A solid soap composition was prepared in the same manner as in Example 1 with the composition shown in Tables 1 and 2. With respect to the obtained solid soap composition, the foam quality, the smooth feeling, and the penetration feeling of the lotion after washing were evaluated according to the following criteria.

(1) Foam quality 10 women (10's to 30's) were used as the panelists, and the foam quality when foaming the solid soap composition was evaluated based on the following criteria.
2 points ... Very creamy foam.
1 point ... Slightly creamy foam.
0 points.
Furthermore, it judged as follows from the total score of all the panelists.
18-20 points ... (very good)
14 to 17 points ... (good)
7 to 13 points △ (possible)
0 to 6 points

(2) Smooth feeling Ten women (10's to 30's) were panelists, and the feeling after using the solid soap composition was evaluated based on the following criteria.
2 points ··· The skin is smooth 1 ··· The skin is slightly smooth 0 · · · A feeling of squeak is felt Further, the following points were determined from the total points of all panelists.
18-20 points ... (very good)
14 to 17 points ... (good)
7 to 13 points △ (possible)
0 to 6 points

(3) Penetration feeling Ten women (10th to 30th generations) were panelists, and the penetration feeling of the skin lotion after washing with the solid soap composition was evaluated based on the following criteria.
2 points ··· The permeation of skin lotion after washing is excellent 1 · · · The permeation of skin lotion after washing is slightly superior 0 · · · The permeation of skin lotion after washing is not felt Judgment was made as follows from the total points of all panelists.
18-20 points ... (very good)
14 to 17 points ... (good)
7 to 13 points △ (possible)
0 to 6 points

As shown in Table 1, in the solid soap compositions of Examples 1 to 7, (a) component was 80 to 94.98% by mass, (b) component was 0.01 to 10% by mass, and (c) component was By containing 0.01 to 10% by mass and 5 to 18% by mass of the component (d), good foam quality, smooth feeling and permeation feeling of the skin lotion are obtained.
On the other hand, in Comparative Example 1 shown in Table 2, since sodium malate was used instead of lactic acid or lactate, a sufficient effect was not obtained with a smooth feeling.
Further, in Comparative Example 2, since sodium citrate was used in place of lactic acid or lactate, a sufficient effect was not obtained with a smooth feeling.
In Comparative Example 3, since glycerin was used instead of polyglycerin, a sufficient effect was not obtained with the permeation feeling of the lotion.
In Comparative Example 4, since PG (propylene glycol) was used instead of polyglycerin, a sufficient effect was not obtained with a smooth feeling or a feeling of penetration of skin lotion.

As described above, the solid soap composition of the present invention has a foam quality suitable for washing creamy and elastic skin, and has a smooth feeling after use and a good feeling of penetration of lotion after washing. Since it is a composition, it has a great influence on the deception world.

Claims (1)

The component (a) shown below is 80 to 94.98% by mass, the component (b) is 0.01 to 10% by mass, the component (c) is 0.01 to 10% by mass, and the component (d) is 5 to 18%. Solid soap composition containing mass%.
(A) Component: linear saturated fatty acid salt having 12 to 18 carbon atoms (b) component: polyglycerin (c) component having an average degree of polymerization of 2 to 10: lactic acid or lactate (d) component: water