JP4770187B2 - Soap composition - Google Patents

Description

  The present invention relates to a soap composition, and more particularly, to a soap composition having a creamy foam quality, excellent in use feeling, moisturizing effect after use (moist feeling), foamability and solubility, and excellent in productivity.

  Conventionally, soap has been widely used as a cleaning agent because it is easy to manufacture, has excellent foaming properties, and is refreshing after use. Various studies have been conducted to further improve this excellent performance.

  When using soap, it is known that the feeling of use can be drastically improved if the foam quality is creamy. For example, Patent Document 1 discloses a soap with dibutylhydroxytoluene, citric acid and higher fatty acid added to a soap base, and Patent Document 2 discloses a polyvalent fatty acid soap. Soap compositions containing alcohol, fatty acid alkanolamides and higher fatty acids are disclosed. However, even in these soap compositions, the foam quality may not be sufficiently creamy.

  Soaps can also feel skin irritation and irritation after use. Since these may cause rough skin, various soap compositions that have an excellent moisturizing effect and are mild to the skin have been studied. For example, Patent Document 3 discloses a solid detergent composition in which glycerin ester and higher fatty acid are added to soap, and Patent Document 4 discloses a skin cleansing composition in which pure rice brew is added to soap. Patent Document 5 discloses a skin cleansing agent obtained by adding Agaricus koji extract to soap, and Patent Document 6 discloses a soap obtained by adding chlorella powder, amphoteric surfactant and the like to soap. However, even in these soap compositions, a sufficient moisturizing effect and mildness to the skin may not be obtained.

Furthermore, the soap production process includes processes such as extrusion of a soap base and stamping. In these processes, there may be a problem in moldability such as poor extrusion, cracking, and flaking due to the moisture content of the soap base, additive components, base composition, and the like, and productivity may be reduced. In order to improve these problems, Patent Document 7 discloses a soap composition in which lauric acid and potassium soap are added to a soap base, and Patent Document 8 discloses a nonionic surfactant and an inorganic salt added to fatty acid soap. And a soap added with silicone, Patent Document 9 discloses a soap obtained by adding glycerin, polyglycerin fatty acid and the like to soap, and Patent Document 10 discloses a soap containing capric acid, pelargonic acid and the like. A composition is disclosed. However, problems may arise during the production of these soaps.
JP-A-8-27490 Japanese Patent Laid-Open No. 2002-60796 JP-A-8-283794 JP-A-9-40547 JP 2000-191513 A JP 2003-238993 A JP-A-8-27489 JP 2000-309795 A Japanese Patent Laid-Open No. 3-6297 JP-A-6-33097

  An object of the present invention is to provide a soap composition having a creamy foam quality, excellent in use feeling, moisturizing effect after use (moist feeling), foaming property and solubility, and excellent in productivity.

  As a result of intensive studies by the present inventors in order to solve the above-mentioned problems, the intended soap composition can be obtained by combining specific alkylene oxide derivatives, fatty acid alkali metal salts, glycerin and water in specific ratios. As a result, the present invention has been completed.

That is, the soap composition of the present invention is a soap composition comprising an alkylene oxide derivative (a), a fatty acid alkali metal salt (b), glycerin (c) and water (d), the alkylene oxide derivative (a). Is a derivative of the formula (I):
Gly- [O- (AO) _m (BO) _n -H] ₃ (I)
(In the formula, Gly is a residue obtained by removing a hydroxyl group from glycerin, (AO) _m is an oligomer part containing a total of mol of oxypropylene group (PO) and oxyethylene group (EO), and m is 2 to 2) And the mass ratio of PO to EO (PO / EO) is 3/2 to 1/4 in the oligomer part, BO is a oxyalkylene group having 4 carbon atoms, and n is The average added mole number of BO, which is a value of 0.5 to 5.) In the soap composition, 0.01 to 30% by mass of the alkylene oxide derivative (a), the fatty acid alkali The metal salt (b) is contained in an amount of 40 to 99% by mass, the glycerin (c) in an amount of 0.01 to 30% by mass, and the water (d) in an amount of 0.01 to 20% by mass. The oxyalkylene group having 4 carbon atoms represented by BO means an oxybutylene group, an oxyisobutylene group and / or an oxytetramethylene group.

  The soap composition of the present invention has a creamy foam quality, excellent use feeling, moisturizing effect after use (moist feeling), foaming and solubility, and excellent productivity.

  The soap composition of the present invention is sometimes referred to as the following alkylene oxide derivative (a) (hereinafter sometimes referred to as compound a, component a), fatty acid alkali metal salt (b) (hereinafter referred to as compound b, component b). A), glycerin (c) (hereinafter may be referred to as “c component”) and water (d) (hereinafter also referred to as “d component”), and additives as required. Hereinafter, these will be sequentially described.

(Alkylene oxide derivative (a))
The glycerin derivative (a) used in the soap composition of the present invention is obtained by adding propylene oxide and ethylene oxide to glycerin at a ratio of 3 to 150 molar equivalents to glycerin, and then converting butylene oxide to 1. It is obtained by adding 5 to 15 molar equivalents. That is, the alkylene oxide derivative (a) is obtained by once synthesizing an adduct of PO and EO and then adding butylene oxide in a block form.

  The mass ratio (PO / EO) of propylene oxide (PO) and ethylene oxide (EO) is 3/2 to 1/4, and the addition form of propylene oxide and ethylene oxide may be random or block. In order to exhibit a higher moisturizing effect, it is preferable to add in a random state. When the mass ratio of propylene oxide and ethylene oxide (PO / EO) is less than ¼, productivity decreases. When it exceeds 3/2, the moisturizing effect is weakened.

  The average added mole number of propylene oxide (PO) and propylene oxide (EO) is preferably in the range of 2-100. If the average added mole number of PO and EO is less than 2, a good moisturizing effect cannot be obtained, and if the average added mole number exceeds 100, there is a possibility that extrusion failure and mold release failure may occur.

  The average number of added moles of alkylene oxide (BO) having 4 carbon atoms is preferably in the range of 0.5-5. If the average added mole number of BO is less than 0.5, creamy foam quality cannot be obtained, and if the average added mole number exceeds 5, it is difficult to obtain good foamability.

  Examples of the alkylene oxide having 4 carbon atoms include 1,2-butylene oxide, 2,3-butylene oxide, and tetramethylene oxide (tetrahydrofuran). Among these, 1,2-butylene oxide is preferable from the viewpoint of easy availability and reaction control.

  Usually, when these alkylene oxides are added to glycerin, the addition reaction is performed using an alkali catalyst, a phase transfer catalyst, a Lewis acid catalyst, or the like. In general, it is preferable to use an alkali catalyst such as potassium hydroxide.

(Fatty acid alkali metal salt (b))
The fatty acid alkali metal salt (b) used in the soap composition of the present invention is produced by a method commonly used by those skilled in the art. Examples of the production method include a fat saponification method, a fatty acid neutralization method, a methyl ester saponification method, and the like. The apparatus used during production may be either a continuous type or a batch type. Examples of fats and oils used for producing fatty acid alkali metal salts, fatty acids and lower alkyl esters of fatty acids include fats and oils usually used by those skilled in the art for the production of soaps. For example, beef tallow, coconut oil, palm oil, palm kernel oil, olive oil, corn oil, sunflower oil, castor oil, or fats and oils such as hydrogenated oils and semi-cured oils of these oils; fatty acids constituting these oils; And lower alkyl esters of fatty acids such as methyl esters and ethyl esters of fatty acids; and mixtures thereof.

  The alkali agent for preparing soap from these oils and fats is preferably an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide.

  Furthermore, it is common for a soap composition to coexist with a fatty acid alkali metal salt and a fatty acid. In the present invention, the fatty acid may be added after preparing the fatty acid alkali metal salt, or when the oil and fat are reacted with the alkali agent, the amount of the alkali agent added is reduced to leave unreacted free fatty acid. You may let them.

(Glycerin (c))
As the glycerin (c) used in the soap composition of the present invention, either purified glycerin or unpurified glycerin derived from fats and oils and glycerin derivatives may be used. By adding glycerin, an excellent moisturizing effect is obtained due to the synergistic effect of the component a and glycerin.

(Water (d))
The water (c) used in the soap composition of the present invention may be adjusted so that the water content is within a specified range by evaporating the water contained by heating or adding water separately. Among these, it is preferable to adjust the amount of water by heating.

(Additive)
Examples of additives that can be included in the soap composition of the present invention include various active agents such as anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants; silica, talc, kaolin, titanium oxide, and sericite. Mineral powdered products such as mica, natural plant extracts such as peony extract, mukuroji extract, perilla extract, yakuinin extract and toki extract; foam improvers such as cellulose powder and various oily agents; glycerin carboxylic acid ester, polyglycerin or Derivatives thereof, polyols such as sorbitol and propylene glycol; humectants such as phospholipids or derivatives thereof, squalane and cationic polymers; scrubbing agents such as crystalline cellulose, peach nucleus, apricot nucleus, corn cob, mannan; tocophenol, vitamin C or its derivatives Antioxidants; hydroxyethane disulfonic acid or a salt thereof, ethylenediaminetetraacetic acid or a salt thereof, a chelating agent such as citric acid or salts thereof; activated carbon; various dyes; pigments; and perfumes. These additives can be contained in the soap composition as long as the effects of the present invention are not impaired.

(Soap composition)
As described above, the soap composition of the present invention contains an alkylene oxide derivative (component a) fatty acid alkali metal salt (component b), glycerin (component c) and water (component d) in specific proportions, as necessary. And additives.

  The component a is contained in the soap composition in an amount of 0.01 to 30% by mass, preferably 0.1 to 20% by mass. When it is less than 0.01% by mass, the feeling of use, foam quality and solubility are deteriorated, and the productivity is further adversely affected. When it exceeds 30 mass%, foaming property worsens. A component may be used independently and may use 2 or more types together.

  The component b is contained in the soap composition in a proportion of 40 to 99% by mass, preferably 50 to 99% by mass, and more preferably 60 to 98% by mass. When it is less than 40% by mass, the foaming property is deteriorated. When it exceeds 99% by mass, the feeling of use (moist feeling) and the solubility are deteriorated. b component may be used independently and may use 2 or more types together.

  The component c is contained in the soap composition in an amount of 0.01 to 30% by mass, preferably 0.1 to 10% by mass. When the amount is less than 0.01% by mass, the feeling of use (moist feeling) is deteriorated, and the productivity and yield of the soap are reduced due to the decrease in the size of the soap base. Furthermore, a synergistic effect with the component a is not obtained. When it exceeds 30% by mass, productivity and yield are reduced due to an increase in the viscosity of the soap base, a decrease in solid formation, and a sweating phenomenon due to the exudation of glycerin in a specific environment.

  The d component is contained in the soap composition in an amount of 0.01 to 20% by mass, preferably 0.1 to 15% by mass. When it is less than 0.01% by mass, the moldability when solidifying is lowered, and the productivity is lowered. When it exceeds 20% by mass, the productivity and yield are reduced due to an increase in viscosity of the soap base, wiping, a decrease in solidity, blocking, and the like.

  The soap composition of the present invention may be used as a solid soap, or may be used as a powder soap through a pulverization step and a drying step. Furthermore, the soap composition of the present invention can be used for body and face washing.

  Next, the present invention will be described in more detail by way of examples.

Synthesis Example 1 Synthesis of polyoxybutylene (BO) (5 mol) polyoxyethylene (EO) (10 mol) polyoxypropylene (PO) (10 mol) glycerin ether (random adduct of EO and PO) Glycerin 92 g and 6 g of potassium hydroxide as a catalyst were charged into an autoclave container. After the air in the vessel was replaced with dry nitrogen, the catalyst was completely dissolved at 140 ° C. with stirring. Next, a mixture of 440 g of ethylene oxide and 570 g of propylene oxide was dropped into the container with a dropping device and stirred for 2 hours. Next, 360 g of butylene oxide was dropped into the container, and the mixture was further stirred for 2 hours to be reacted. After the reaction, the reaction product was collected from the container and adjusted to pH 6.5 with hydrochloric acid. Subsequently, in order to remove water, the pressure was reduced to 0.095 MPa (gauge pressure), and the treatment was performed at 100 ° C. for 1 hour. Subsequently, the target compound a1 was obtained by filtering to remove the salt.

(Synthesis Example 2)
In the same manner as in Synthesis Example 1, compound a2 was synthesized as component a. The compositions of compound a1 and compound a2 are shown in Table 1.

(Comparative Synthesis Example 1) Synthesis of polyoxybutylene (BO) (5 mol) polyoxyethylene (EO) (5 mol) polyoxypropylene (PO) (18 mol) glycerin ether (random adduct of EO and PO) Compound a ′ (m = 7.7, n = 1.7, PO / EO = 6.5 / 1) was obtained in the same manner as in Synthesis Example 1, except that the number of moles of ethylene oxide and propylene oxide was changed. It was.

Example 1
700 g of palm oil partially cured fatty acid (increased melting point 46 ° C.) and coconut oil fatty acid (manufactured by Nippon Oil & Fats Co., Ltd., “coconut fatty acid”) using a 5 L double-arm kneader (PNV-5 type manufactured by Irie Shokai Co., Ltd.) 300 g was dissolved at 70 ° C. Next, a 28% by mass sodium hydroxide aqueous solution (manufactured by Kishida Chemical Co., Ltd., distilled water was added to “reagent special grade sodium hydroxide” to 28% by mass) was used so as to be equimolar with the above fatty acid mixture. It was summed up. The neutralization point was confirmed to be slightly red using a phenolphthalein indicator solution. Next, 2% by mass of stearic acid (manufactured by Nippon Oil & Fats Co., Ltd., “NAA-180”) was added to make a per-fatty acid. To the obtained product (neat soap), the alkylene oxide derivative (compound a1) prepared in Synthesis Example 1 and glycerin (manufactured by NOF Corporation, “RG”) were added so as to have the ratio shown in Table 2. Next, the mixture was stirred while being heated until the water content became 10% to obtain a soap base. This soap base was stamped with a stamping machine to obtain a solid soap.

  About the obtained soap, (1) Usability, (2) Foaming property, (3) Foam quality, (4) Solubility, (5) Moisturizing property and (6) Productivity were evaluated by the following methods. It was.

(1) Usability The obtained soap was used by 10 women (10-30s) as panelists. The usability was judged according to the following criteria.
2 points: When the user feels that the washing is good without feeling the tightness and sliminess.
1 point: When a slight feeling of tightness and sliminess is felt.
0 points: When a strong feeling of tension and sliminess is felt.
The total score of 10 people was calculated and evaluated as follows.
○: Total score of 14 to 20 (soap with good usability)
Δ: 7 to 13 points in total (soap with a normal feel)
X: 0-6 points in total (soap with poor usability)

(2) Foaming property With 10 women (10-30s) as panelists, the soap obtained was picked up and foamed. The foaming property when foamed was judged according to the following criteria.
2 points: When bubbles feel quickly and richly and foaming properties are good.
1 point: When it feels that it takes some time to foam well.
0 point: When it takes a very long time to foam and the amount of foam is not rich.
The total score of 10 people was calculated and evaluated as follows.
○: Total score of 14 to 20 (soap with good foaming property)
Δ: 7 to 13 points in total (soap with normal foaming properties)
X: 0 to 6 points in total (soap with poor foaming properties)

(3) Foam Quality Using 10 women (10-30s) as panelists, the soap obtained was picked up and foamed. The foam quality when foamed was judged according to the following criteria.
2 points: When feeling very creamy foam.
1 point: A little creamy but feels more creamy.
0 points: If you feel you are not creamy.
The total score of 10 people was calculated and evaluated as follows.
○: Total score of 14 to 20 (soap with creamy cream)
Δ: 7 to 13 points in total (soap with normal foam quality)
×: 0 to 6 points in total (soap with poor foam quality)

(4) Solubility 10 women (10-30s) as panelists picked up the soap obtained and dissolved it. The solubility when dissolved was determined according to the following criteria.
Two points: When it can be easily dissolved and there is no undissolved residue.
1 point: When all the time is taken, all melts and there is no undissolved residue.
0 point: It is difficult to melt, and there is undissolved material over time.
The total score of 10 people was calculated and evaluated as follows.
○: Total score of 14 to 20 (soap with good solubility)
Δ: 7 to 13 points in total (soap with normal solubility)
×: 0 to 6 points in total (soap with poor solubility)

(5) Moisturizing property Ten women (10-30s) were panelists and picked up soap and had it foamed. Subsequently, the state after rinsing sufficiently with running water and wiping off moisture with a towel was judged according to the following criteria.
2 points: When a moist moisturizing feeling is felt.
1 point: When a slight moisturizing feeling is felt.
0 point: When a moisturizing feeling was not felt.
The total score of 10 people was calculated and evaluated as follows.
○: Total score of 14 to 20 (soap with excellent moisturizing effect)
Δ: 7 to 13 points in total (soap with normal moisturizing effect)
X: 0 to 6 points in total (soap with poor moisturizing effect)

(6) Productivity The ease of molding (productivity) when soap base was molded using an extruder and a stamping machine was determined according to the following criteria.
○: There is no problem with cracks, cracks and mold separation, and productivity is good.
Δ: There are some problems in cracks, cracks, and mold separation, which slightly affects productivity.
X: There are problems in cracking, cracking and mold separation, which adversely affects productivity.

  The results are shown in Table 2.

(Examples 2 and 3)
In the same manner as in Example 1, the components shown in Table 2 were blended in the proportions shown in Table 2. About the obtained solid soap, it carried out similarly to Example 1, and evaluated said (1)-(6). The results are shown in Table 2.

(Comparative Examples 1 and 2)
In Comparative Example 1, the alkylene oxide derivative of component a was not used, and in Comparative Example 2, the alkylene oxide derivative (compound a ′) prepared in Comparative Synthesis Example 1 different from the alkylene oxide derivative used in the present invention was used. In the same manner as in Example 1, the components shown in Table 2 were blended in the proportions shown in Table 2. About the obtained solid soap, it carried out similarly to Example 1, and evaluated said (1)-(6). The results are shown in Table 2.

  The soap composition (solid soap) of the present invention had a creamy foam quality, excellent use feeling, moisturizing effect after use (moist feeling), foaming and solubility, and excellent productivity.

  On the other hand, in Comparative Examples 1 and 2, sufficient performance was not obtained. In Comparative Example 1, since the component a was not included, the feeling of use, foam quality, solubility and moisturizing effect were poor, and the productivity was not good. In Comparative Example 2, since a glycerin derivative different from the component a was contained, the feeling of use, foamability, foam quality, solubility and moisturizing effect were not sufficient, and the productivity was further poor.

  The soap composition of the present invention has a creamy foam quality and excellent usability, is moist after use, has an excellent moisturizing effect, and has excellent productivity, and can be used for solid soaps.

Claims (1)

A soap composition comprising an alkylene oxide derivative (a), a fatty acid alkali metal salt (b), glycerin (c) and water (d),
The alkylene oxide derivative (a) is a derivative represented by the formula (I):
Gly- [O- (AO) _m (BO) _n -H] ₃ (I)
(In the formula, Gly is a residue obtained by removing a hydroxyl group from glycerin, (AO) _m is an oligomer part containing a total of mol of oxypropylene group (PO) and oxyethylene group (EO), and m is 2 to 2) And the mass ratio of PO to EO (PO / EO) is 3/2 to 1/4 in the oligomer part, BO is a oxyalkylene group having 4 carbon atoms, and n is The average added mole number of BO, which is a value of 0.5 to 5.)
In the soap composition, the alkylene oxide derivative (a) is 0.01 to 30% by mass, the fatty acid alkali metal salt (b) is 40 to 99% by mass, and the glycerin (c) is 0.01 to 30% by mass. %, And the water (d) is contained in a proportion of 0.01 to 20% by mass.