JP6337501B2 - Solid soap - Google Patents

Description

  The present invention relates to a framed solid soap that foams abundantly at the time of use, has excellent solubility, does not easily melt, has a good feeling after washing, and has excellent productivity.

Solid soap is manufactured by mechanical kneading method or frame kneading method, and the frame kneading solid soap obtained by frame kneading method can contain a large amount of polyhydric alcohol and saccharides which are moisturizing ingredients, so It is mainly used for face washing because of its excellent protective effect and mild use feeling.
In the frame kneading method, fats and fatty acid salts obtained with an alkaline agent such as fatty acid and sodium hydroxide are heated and dissolved in a mixed solvent of lower monohydric alcohol such as ethyl alcohol and water, and further sugars, Generally, a method of adding a hydrating alcohol or, if necessary, a fragrance, a pigment, a plant extract, etc., pouring into a mold, solidifying and cutting, gradually evaporating the solvent over about 30 to 60 days and solidifying. Has been used.
However, the conventional framed solid soap thus obtained contains about 30 to 60% by mass of lower monohydric alcohols such as ethyl alcohol and water, and therefore requires long-term drying. It was inferior in productivity and easily melted down in the bathroom soap tray, making it impossible to use.

  In order to solve this problem, for example, Patent Document 1 discloses a method for reducing the amount of a lower monohydric alcohol or water in a framed solid soap. However, although this method has the effect of shortening the drying days, it does not make drying unnecessary, so that it is insufficient in terms of improving productivity.

  In order to solve this problem, for example, Patent Document 2 discloses a method using a polyhydric alcohol and a saccharide instead of a lower monohydric alcohol or water. However, this method can eliminate the drying step, but on the other hand, the rapid foaming property of soap and creamy rich foaming are reduced, and melting and collapse may occur.

  For example, Patent Document 3 discloses a frame-kneaded transparent solid soap in which two or more polyhydric alcohols are used in combination under certain conditions. However, although this frame-kneaded transparent solid soap improves foaming and solubility, the feeling of melting and washing is not sufficient, and further improvement has been demanded.

  Moreover, in order to improve foaming and usability, framed solid soap using surfactants such as saturated fatty acid soaps and nonionic surfactants, saccharides and inorganic salts is described in Patent Document 4, for example. . However, since this frame kneaded solid soap contains a large amount of sugars and polyhydric alcohols, foaming is not sufficient and sometimes melts and collapses.

  In this way, a solid soap that does not require a long drying process, has excellent foaming and solubility during use, is not easily melted down, has a good feeling of washing and is highly productive, and is fully satisfactory. It has not been obtained yet.

JP 2010-254758 A JP 2010-180381 A JP 2003-82394 A JP 2009-13404 A

  An object of the present invention is to obtain a framed solid soap that bubbles abundantly during use, has excellent solubility, does not easily melt, has a good feeling after washing, and has excellent productivity.

As a result of intensive studies by the present inventors in order to solve the above problems, a. A specific saturated fatty acid salt, b. Dipropylene glycol and / or propylene glycol, c. Water and d. The present inventors have found that the above-described object can be achieved by containing each component of a linear saturated fatty acid in combination at a specific ratio, and the present invention has been completed based on this finding.
That is, the present invention provides a. A fatty acid salt obtained from a fatty acid and a base, wherein the total amount of linear saturated fatty acids having 12 to 18 carbon atoms among fatty acids constituting the fatty acid salt is 96% by mass or more, and linear saturated fatty acids having 12 carbon atoms 15 to 35 mass%, C14 linear saturated fatty acid is 35 to 65 mass%, C16 linear saturated fatty acid is 5 to 25 mass%, and C18 linear saturated fatty acid is 0 to 25 mass%. An aliphatic agent containing an alkali metal as a base, the alkali metal is potassium and sodium, and the mass ratio of potassium / sodium in the alkaline agent is 1/99 to 1/1. -69.9 mass%, b. Dipropylene glycol (DPG) and / or propylene glycol (PG) 15-40% by weight, c. 15-35% by weight of water, d. It contains 0.1 to 10% by mass of a linear saturated fatty acid having 12 to 18 carbon atoms, the total amount (b + c) of component b and component c is 35 to 65% by mass, and the content ratio of component a to component c (A / c) is 1.3 to 2.3, and the content ratio [a / (b + c)] of the a component to the total amount (b + c) of the b and c components is 0.4 to 1.8. It relates to a certain type of solid soap.

  The frame-kneaded solid soap of the present invention foams abundantly at the time of use, has excellent solubility, does not easily melt, has a good feeling after washing, and has excellent productivity.

Hereinafter, embodiments of the present invention will be described.
The frame kneaded solid soap of the present invention contains the following components a, b, c and d. First, the a component will be described.

[A. Fatty acid salt)
The component a used in the present invention is a fatty acid salt obtained by reacting a fatty acid with a base.
The total amount of linear saturated fatty acids having 12 to 18 carbon atoms among the fatty acids constituting the fatty acid salt is 96 mass% or more, preferably 98 to 100 mass%. When the total amount of linear saturated fatty acids having 12 to 18 carbon atoms is less than 96% by mass, foamability, solubility and rapid foaming properties are deteriorated, the feeling after washing is deteriorated, and cracks are likely to occur. . The fatty acid constituting the fatty acid salt may contain other fatty acids other than the linear saturated fatty acid having 12 to 18 carbon atoms, but is substantially free of unsaturated fatty acids and branched fatty acids, for example, the content Is preferably 1% by mass or less.

Among all fatty acids constituting the fatty acid salt, the linear saturated fatty acid having 12 carbon atoms is 15 to 35% by mass, preferably 20 to 30% by mass. If the linear saturated fatty acid having 12 carbon atoms is less than 15% by mass, the foaming property, fast foaming property and solubility may be reduced, and if it is more than 35% by mass, the elasticity of the foam may be reduced and melting may occur. There is.
Of all the fatty acids constituting the fatty acid salt, the linear saturated fatty acid having 14 carbon atoms is 35 to 65% by mass, preferably 40 to 60% by mass. If the linear saturated fatty acid having 14 carbon atoms is less than 35% by mass, the foaming property, the persistence of the foam and the elasticity of the foam may be lowered, and if it is more than 65% by mass, the solubility may be lowered.
Of all fatty acids constituting the fatty acid salt, the linear saturated fatty acid having 16 carbon atoms is 5 to 25% by mass, preferably 5 to 20% by mass. If the amount of the linear saturated fatty acid having 16 carbon atoms is less than 5% by mass, the melt may be easily broken, and if it is more than 25% by mass, the quick foaming property is lowered and cracking is likely to occur, and the feeling after washing is also good. May be worse.
Of all the fatty acids constituting the fatty acid salt, the linear saturated fatty acid having 18 carbon atoms is 0 to 25% by mass, preferably 0 to 20% by mass. When the number of linear saturated fatty acid having 18 carbon atoms is more than 25% by mass, the quick foaming property is lowered, cracking is likely to occur, and the feeling after washing may be deteriorated.

  Examples of fatty acids include beef tallow, coconut oil, palm oil, palm kernel oil, olive oil, corn oil, sunflower oil, rapeseed oil, canola oil, soybean oil, sunflower oil and fatty acids obtained from these hardened oils. Fatty acid obtained by refining the oil or a single fatty acid with increased purity can be used, and the above-described oils and fatty acid methyl esters can also be used.

Examples of the base to be reacted with the fatty acid include an alkali agent containing an alkali metal, ammonium, or alkanolamine, and an alkali agent containing an alkali metal as a component is preferable in terms of foaming and foam quality. The alkali metals are potassium and sodium, and the mass ratio of potassium / sodium in the alkali agent is 1/99 to 1/1, preferably 20/80 to 1/1, more preferably 30/70 to 45/55. It is. If the mass ratio of potassium / sodium is less than 1/99, the solubility and productivity may be lowered, and if it is greater than 1/1, the feeling after washing may be poor and the melt may collapse.
Examples of the alkali agent containing an alkali metal as a component include hydroxides and carbonates, and examples of the hydroxide include sodium hydroxide and potassium hydroxide.

The content of component a contained in the framed solid soap of the present invention is 35 to 69.9% by mass, preferably 36 to 65% by mass, and more preferably 38 to 60% by mass.
If the content of component a is less than 35% by mass, sufficient foaming cannot be obtained, and it may take time for solidification and decrease productivity, and may be easily melted, and exceeds 69.9% by mass. In addition, the solubility may be lowered and the feeling after washing may be lowered.

[B. Dipropylene glycol and / or propylene glycol]
The component b used in the present invention is dipropylene glycol and / or propylene glycol. Only one of dipropylene glycol and propylene glycol may be used alone, or both may be used in combination. As a ratio when used in combination, dipropylene glycol / propylene glycol is preferably 7/3 to 0/10.

  Content of b component contained in the frame kneaded solid soap of this invention is 15-40 mass%, Preferably it is 20-35 mass%, More preferably, it is 22-32 mass%. If the content of the component b is less than 15% by mass, the soap component may not be dissolved, and the solidification property when solidified may be inferior, or the feeling after washing may be poor, and the solubility may be reduced. Moreover, when content exceeds 40 mass%, it is inferior to foaming and there exists a possibility that it may become easy to melt.

  When the content of linear saturated fatty acid having 18 carbon atoms is small among all fatty acids constituting the fatty acid salt, for example, when it is 10% by mass or less, more than half of the content of component b is propylene glycol, and half Is preferably dipropylene glycol, and conversely, when the content of the linear saturated fatty acid having 18 carbon atoms is high, for example, when it exceeds 10% by mass, less than half of the content of component b is propylene glycol. It is preferable that more than half is dipropylene glycol.

[C. water〕
The component c used in the present invention is water.
The content of the component c contained in the framed solid soap of the present invention is 15 to 35% by mass, preferably 18 to 34% by mass, and more preferably 20 to 32% by mass. If the content of component c is less than 15% by mass, the solubility of the fatty acid salt may be reduced, and there is a risk that solid soap with a uniform composition may not be obtained. If it exceeds 35% by mass, the product becomes too soft and the productivity is lowered, so May be easier.
The water as the component c includes water contained in a soap base.

[D. C12-18 linear saturated fatty acid]
The d component used in the present invention is a linear saturated fatty acid having 12 to 18 carbon atoms. As the linear saturated fatty acid having 12 to 18 carbon atoms, any linear saturated fatty acid having any carbon number may be used alone, or any combination thereof may be used. Alternatively, it is preferable to use any one of straight-chain saturated fatty acids having 18 carbon atoms.
Examples of the linear saturated fatty acid having 12 to 18 carbon atoms include beef tallow, coconut oil, palm oil, palm kernel oil, olive oil, corn oil, sunflower oil, rapeseed oil, canola oil, soybean oil, castor oil and the extremes of these oils and fats. Fatty acids obtained from hydrogenated oils, fatty acids obtained by refining them, or simple fatty acids with increased purity can be used, and the aforementioned oils and fatty acid methyl esters can also be used.

  Content of d component contained in the frame kneaded solid soap of this invention is 0.1-10 mass%, Preferably it is 0.5-6 mass%, More preferably, it is 0.5-5 mass%, Furthermore, Preferably it is 1-4 mass%. If the content of the d component is less than 0.1% by mass, it tends to melt and collapse, and the feel after washing may be inferior. If it exceeds 10% by mass, foaming and solubility may be inferior.

In the frame-kneaded solid soap of the present invention, the total amount (b + c) of the b component and the c component is 35 to 65% by mass, preferably 40 to 60% by mass. If the total amount (b + c) is less than 35% by mass, foaming may be reduced, and the pouring property into the mold during production may be reduced. If the total amount (b + c) exceeds 65% by mass, melting tends to occur and productivity is reduced. There is a risk.
Further, the content ratio (a / c) of the a component to the c component is 1.3 to 2.3, preferably 1.4 to 1.9. If the content ratio (a / c) is less than 1.3, it tends to melt and deteriorate, and if it exceeds 2.3, the soap component may not sufficiently dissolve and become non-uniform. .
Furthermore, the content ratio [a / (b + c)] of the a component to the total amount (b + c) of the b and c components is 0.4 to 1.8, preferably 0.6 to 1.5. If the content ratio [a / (b + c)] is less than 0.4, foaming or pouring into the mold during production may be reduced. Or the flowability into the mold during production may be reduced.

The framed solid soap of the present invention preferably contains glycerin or diglycerin in addition to the above components a to d. The glycerin or diglycerin used may be obtained from animals or plants, or may be obtained by synthesis. Moreover, what is produced | generated in the case of saponification of fats and oils can be used for glycerin or diglycerin as well as what was isolated. Further, glycerin and diglycerin may be used in combination.
The content of glycerin or diglycerin is, for example, 0.1 to 10 parts by weight, preferably 0.3 to 8 parts by weight, more preferably 100 parts by weight of the total content of components a to d. 0.5 to 6 parts by mass. By containing glycerin or diglycerin to such an extent, the feeling of firmness and moistness after use is further improved, deformation and melting after molding are less likely to occur, and the stability is further improved.

The framed solid soap of the present invention preferably contains vegetable oil in addition to the above components a to d. By containing vegetable oil, a better effect can be obtained in terms of feeling after washing, film feeling and melting.
Examples of vegetable oils include olive oil, macadamia nut oil, castor oil, jojoba oil, palm oil, palm kernel oil, palm oil, soybean oil, sunflower oil and the like, preferably olive oil, sunflower oil, macadamia nut oil, jojoba oil. More preferred are olive oil, jojoba oil and macadamia nut oil, and one or more selected from these vegetable oils can be used. These vegetable oils are more preferably those that have undergone refining steps generally performed such as deoxidation, decolorization, and deodorization.
The content of the vegetable oil is, for example, 0.1 to 5 parts by mass, preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the total content of the components a to d. By adding vegetable oil to this extent, the feeling of tension and film feeling after use is further improved, melting and collapsing are less likely to occur, and the moldability and stability are further improved.

  The framed solid soap of the present invention comprises: a. A specific fatty acid salt b. Dipropylene glycol or propylene glycol and c. Soluble in water and d. It can be molded by pouring soap glue obtained by uniformly dissolving a specific straight-chain saturated fatty acid into a mold similar to conventional framed soap, and cooling and solidifying. Since the frame-kneaded solid soap of the present invention can be easily produced in a short time without going through a long drying step, the productivity is high.

The frame-kneaded solid soap of the present invention may contain various components usually used for solid soap to the extent that the effects of the present invention are not impaired. For example, it contains chelating agents such as EDTA and etidronic acid and their salts, antioxidants such as natural vitamin E, thickeners, anti-inflammatory agents, moisturizers, bactericides, antiseptics, perfumes, pigments, etc. Also good.
In addition, it is desirable that the framed solid soap of the present invention does not substantially contain saccharides such as sucrose and glucose from the viewpoint of temporal stability of hue and odor.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In the examples,% means mass basis.

[Examples 1-7 and Comparative Examples 1-10]
The solid soap of Example 1 having the composition shown in Table 1 was prepared by the following method, and solid soap was prepared in the same manner as in Example 1 for Examples 2 to 7 and Comparative Examples 1 to 10.
(Production example)
Saturated fatty acid is put into a 5 L double-arm kneader (Irie Shokai Co., Ltd., PNV-5 type) and heated to about 80 ° C., and a mixed solution of 28% sodium hydroxide aqueous solution and 28% potassium hydroxide aqueous solution is added. The mixture was added and stirred at 85 ° C. to 95 ° C. for about 5 minutes. It was dried by mixing with heating to adjust the amount of water, and a soap base having a water content of about 10% was obtained. The soap base thus obtained was dissolved in propylene glycol (PG) and water, and further saturated fatty acid was dissolved to make it uniform. After confirmation of dissolution, olive oil, glycerin, tocopherol (natural vitamin E) and EDTA · 2Na (ethylenediaminetetraacetic acid disodium salt) were added and dissolved to obtain soap glue.
Next, the soap paste was poured into a cylindrical form (65 mm in diameter) and allowed to cool for about half a day until it became 30 ° C. or less at room temperature to solidify. After solidification, it was taken out from the mold, cut into 3 cm intervals, and the soap was allowed to stand on a tray for 7 days to obtain a frame-kneaded solid soap of Example 1.
The water content of the obtained solid kneaded soap was measured by the Kett method. Moreover, the obtained frame kneaded solid soap was evaluated by the following method.

(Moisture measurement method)
The framed solid soaps of Examples and Comparative Examples are blended with a large amount of polyhydric alcohol such as PG. Therefore, all the volatile components were volatilized with an infrared moisture meter and the polyhydric alcohol was reduced to moisture. .
Apparatus: Infrared moisture meter, FD-240 (Ketsu Scientific Research Institute)
Method: Cut the sample cut by the four-division method (JIS K 3304; 1984) as finely as possible, place about 1 g of sample on the sample plate, and spread the sample evenly. Next, heating is continued to a volatile content constant point at a drying temperature of 150 ° C., and the measured value is read when the constant weight is reached. The water content in the framed solid soap was determined by the following formula.
(Formula) W = T-M
W: moisture T: measured value M: polyhydric alcohol content For example, in Example 1, T (measured value) is 59%, and M (polyhydric alcohol content) is 33% (PG 32%, glycerin 1%). Therefore, the moisture (volatile content) is 59% -33% = 26%.

(1) Foaming 10 women (20's to 50's) were panelists, and the foam quality at the time of foaming by taking solid soap was evaluated based on the following criteria.
2 points: When you feel that foaming is very high.
1 point ... If you feel a little bubbling.
0 point: When foaming is felt low.

Judgment was made as follows from the total score of all panelists.
14 to 20 points. .Circle-circle (provided that there are no panelists who have evaluated 0 points): Solid soap that is richly foamed.
7 to 13 points: Δ: Solid soap with weak foaming.
0 to 6 points X: Solid soap with almost no foaming.

(2) Solubility 10 women (20's to 50's) were panelists and evaluated for ease of dissolution when taking a solid soap and lathering it based on the following criteria.
2 points ... When it feels very easy to melt.
1 point ... If you feel that it is slightly soluble.
0 point: When it is difficult to melt.

Judgment was made as follows from the total score of all panelists.
14 to 20 points: ○ (provided that there is no panel with an evaluation of 0 points): Solid soap with excellent solubility.
7 to 13 points: Δ: Solid soap with low solubility.
0 to 6 points x: Solid soap with extremely low solubility.

(3) Disintegration After 10 solid soaps were immersed in 25 ° C. water for 10 minutes, they were dried for 2 hours, and the surface state of each solid soap was visually observed and evaluated according to the following criteria.
Accepted product: The surface is soft, but the inside is in a hard state, and almost no melting occurs.
Rejected product: softened to the inside and melted down.

Judgment was made as follows from the number of accepted products.
9 to 10 ◯: Good solid soap that does not easily melt.
7 to 8 △: Solid soap that does not easily melt or collapse.
0-6 pieces x: Solid soap that is easy to melt.

(4) Feeling after washing Ten women (20's to 50's) were panelists, and the feeling after washing was evaluated based on the following criteria after washing the body with solid soap.
2 points: When the skin feels smooth and feels moist.
1 point: When feeling soft and smooth or moist.
0 points: When there is no feeling of smoothness or moistness.

Judgment was made as follows from the total score of all panelists.
14 to 20 points: ○ (provided that there is no panel with an evaluation of 0 points): Solid soap with an excellent feel after washing.
7 to 13 points: Δ: Solid soap with a slightly good feel after washing.
0 to 6 points: X: A poor solid soap with a slightly good feeling after washing.

(5) Productivity According to the above production example, the ease of pouring and the tendency of solidification when soap dissolved in a container was poured into a mold was observed and judged according to the following criteria.
Accepted product (O): There is almost no deposit on the container, and it solidifies firmly without being soft within 60 minutes.
Non-acceptable product (x): Adhering to the container is much, and after 60 minutes it is soft and changes its shape as it is, is easily scratched and cannot be commercialized, or the components do not dissolve uniformly and become non-uniform.

  In the columns a and d of the table, C12 is a linear saturated fatty acid having 12 carbon atoms, C14 is a linear saturated fatty acid having 14 carbon atoms, C16 is a linear saturated fatty acid having 16 carbon atoms, and C18 is 18 carbon atoms. In the column b, DPG represents dipropylene glycol and BG represents butylene glycol.

From the results of Examples 1 to 7 shown in Table 1, each of the frame-kneaded solid soaps of the present invention is richly foamed during use, excellent in solubility, hardly melted down, excellent in the feel of washing, and in productivity. I can understand that it is excellent.
On the other hand, in Comparative Examples 1-10, sufficient performance is not obtained.
Specifically, in Comparative Example 1, the content of component a is small, the content of b + c is large, and the mass ratio of a / c is small. Therefore, foaming, melting, and productivity are inferior.
In Comparative Example 2, since the content of the component a is large, the content of the component b is small, the content of b + c is small, and the mass ratio of a / c and the mass ratio of a / (b + c) is large. It is insufficient in terms of feel and solubility, and inferior in terms of productivity.
In Comparative Example 3, since the content of the component b is small, the content of the component c is large, and the mass ratio of a / c is small, the feeling of washing and the solubility are insufficient, and the productivity point It is inferior.

In Comparative Example 4, since the content of the component a is small, the content of the component b is large, and the content of b + c is large, the solubility and melting are insufficient, and the foaming is inferior.
In Comparative Example 5, since the content of the b component is large, the content of the c component is small, and the mass ratio of a / c is large, the solubility is insufficient, the melt is broken, and the productivity is inferior. ing.
In Comparative Example 6, since the content of the component a is small, the content of the component c is large, the content of b + c is large, and the mass ratio of a / c is small, foaming, melting and inferior in terms of productivity Yes.

In Comparative Example 7, BG (butylene glycol) is contained instead of the b component, and since the content of b + c is small, it is insufficient in terms of melting and inferior in terms of foaming, solubility, and productivity. .
In Comparative Example 8, sucrose is contained in place of the component b, and the content of b + c is small, so that foaming, solubility, melting, and productivity are inferior.
In Comparative Example 9, the fatty acid composition contains a fatty acid salt different from that of the present invention, contains BG, saccharides and ethanol instead of the b component, does not contain the d component, has a small content of b + c, and a / Since the mass ratio of c and the mass ratio of a / (b + c) are large, it is insufficient in terms of foaming and feeling after washing, melts and collapses, and is inferior in productivity.
In Comparative Example 10, the fatty acid composition contains a fatty acid salt different from that of the present invention, contains isoprene glycol or saccharide instead of the b component, does not contain the d component, and has a small content of b + c. It is inadequate in the feeling of washing up and inferior in terms of melting.

Claims (1)

The a component shown below is 35 to 69.9% by mass, the b component is 15 to 40% by mass, the c component is 15 to 35% by mass, the d component is 0.1 to 10% by mass, the b component and the c component of the total amount (b + c) is 35 to 65 wt%, the content ratio of a component to component c (a / c) is 1.3-2.3, the total amount of component b and component c (b + c The ratio of the component a to [a / (b + c)] is 0.4 to 1.8.
a. A fatty acid salt obtained from a fatty acid and a base, wherein the total amount of linear saturated fatty acids having 12 to 18 carbon atoms among fatty acids constituting the fatty acid salt is 96% by mass or more, and linear saturated fatty acids having 12 carbon atoms 15 to 35 mass%, C14 linear saturated fatty acid is 35 to 65 mass%, C16 linear saturated fatty acid is 5 to 25 mass%, and C18 linear saturated fatty acid is 0 to 25 mass%. A fatty acid salt containing an alkali agent comprising an alkali metal as a base, wherein the alkali metal is potassium and sodium, and the potassium / sodium mass ratio in the alkali agent is 1/99 to 1/1 . Dipropylene glycol and / or propylene glycol c. Water d. C12-18 linear saturated fatty acid