JP6365225B2 - Solid soap - Google Patents

Description

  The present invention provides a foamed solid that is foamed quickly and richly even at low temperatures, excellent in solubility, excellent in the feeling of washing, and has a low productivity of foam in soap when poured into a frame and solidified. Regarding soap.

Solid soap is usually produced by a frame kneading method or a mechanical kneading method. The framed solid soap obtained by the frame kneading method can contain a large amount of polyhydric alcohols and saccharides, which are moisturizing components, than the solid soap obtained by the mechanical kneading method. Since the feeling is mild, it is mainly used for face washing.
In the frame kneading method, the following methods have generally been used. First, in a mixed solvent of lower monohydric alcohol such as ethyl alcohol and water, a fatty acid salt obtained by oil or fat or a fatty acid and an alkali agent such as sodium hydroxide is heated and dissolved. Add fragrance, pigment, plant extract, etc. After pouring into a mold and solidifying, it is cut into an appropriate size, and ethanol or water as a solvent is gradually evaporated over about 30 to 60 days.
However, the conventional solid kneaded soap thus obtained contains about 30 to 60% by mass of lower monohydric alcohol such as ethyl alcohol and water, and is produced because a long drying period is required. The foaming may be inferior or the foaming may be inferior when used in low-temperature water.

  In order to solve this problem, for example, Patent Document 1 discloses a method of reducing a part of the lower monohydric alcohol and water contained in the framed solid soap. However, even this method has a slight effect of shortening the drying days, and is insufficient in terms of productivity improvement.

  In order to solve this problem, for example, Patent Document 2 discloses a method using dipropylene glycol, propylene glycol and saccharide instead of lower monohydric alcohol or water. However, this method can eliminate the need for a long drying process, but on the other hand, it reduces the rapid foaming property of soap and the rich foaming with creamy, and the yield is lowered due to the entrainment of bubbles inside the solidified soap. There was a thing.

  Further, for example, Patent Document 3 discloses a frame-kneaded transparent solid soap in which two or more kinds of polyhydric alcohols are used in combination under certain conditions. However, although this frame-kneaded transparent solid soap improves foaming and solubility, it is not sufficient in the feeling of washing and the effect of suppressing the yield reduction due to entrainment of foam, and further improvement has been demanded.

  Moreover, in order to improve foaming and feeling in use, a framed transparent solid soap using a surfactant such as a saturated fatty acid soap and a nonionic surfactant, a saccharide and an inorganic salt is described in Patent Document 4, for example. Yes. However, since this frame-kneaded transparent solid soap contains a large amount of sugars and polyhydric alcohols, foaming is not sufficient, and the effect of suppressing the yield reduction due to entrainment of bubbles is not sufficient.

  In this way, it does not require a long drying process at the time of production, and when it is poured into a frame and solidified, there is little foam entrainment in the soap, and it is highly productive, and even when it is used, it quickly and richly foams, A solid soap with excellent solubility, resistance to disintegration, excellent feeling after washing, and sufficient satisfaction has not yet been obtained.

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

  The present invention provides a foamed solid that is foamed quickly and richly even at low temperatures, excellent in solubility, excellent in the feeling of washing, and has a low productivity of foam in soap when poured into a frame and solidified. The purpose is to provide soap.

  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, d. A polymer obtained by using a compound of the formula (I) and an alkyl (meth) acrylate, e. It has been found that the above object can be achieved by containing each component of the cationized polymer in combination at a specific ratio, and the present invention has been completed based on this finding.

（式中Ｒ^１は水素原子またはメチル基であり、Ｒ^２、Ｒ^３およびＲ^４はそれぞれ炭素数１〜８のアルキル基であり、ｎは２〜４の整数である。） That is, the present invention includes 35 to 70% by mass of component a shown below, 15 to 40% by mass of component b, 10 to 35% by mass of component c, 0.001 to 1% by mass of component d, and component e of e. 0.01 to 1% by mass, the total amount (b + c) of component b and component c is 35 to 65% by mass, and the content ratio (a / c) of component a to component c is 1.3 to 3 0.0, 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.
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 30 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 (DPG) and / or propylene glycol (PG)
c. Water d. A polymer obtained from a monomer containing a compound represented by the formula (I) and a (meth) acrylic acid alkyl ester in a total amount of 60 to 100% by mass, the compound represented by the formula (I) / (meth) acrylic acid Polymer in which content ratio of alkyl ester is 100/0 to 10/90 in mass ratio e. Cationized polymer

(In the formula, R ¹ is a hydrogen atom or a methyl group, R ² , R ³ and R ⁴ are each an alkyl group having 1 to 8 carbon atoms, and n is an integer of 2 to 4).

  The framed solid soap of the present invention foams quickly and richly even at low temperatures, has excellent solubility, and feels good after washing, and has less foam entrainment when poured into a frame and solidifies. The effect is excellent.

Embodiments of the present invention will be described below.
The frame-kneaded solid soap of the present invention contains the following components a to e.

[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.
Examples of the fatty acid constituting the fatty acid include linear saturated fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid, and these mixed fatty acids may be used. These fatty acids may be derived from plants, animals, or chemically synthesized.
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% by mass or more, preferably 98 to 100% by mass. When the total amount of linear saturated fatty acid having 12 to 18 carbon atoms is less than 96% by mass, foamability, solubility and rapid foaming property are deteriorated, the feeling after washing is deteriorated, and cracking is likely to occur. is there. 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.

  Of all the 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 lowered, and the yield may be lowered due to entrainment of bubbles. There is a risk that the elasticity of the foam will be reduced, causing melting and collapse.

  Among all 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 amount of 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 reduced, and the yield may be reduced due to entrainment of the foam. There is a possibility that solubility may be lowered.

  Of the total 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 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 rapid foaming property is lowered and cracking is likely to occur, and it is poured into the frame. There is a risk that the yield may decrease due to the entrapment of bubbles in the soap solidified.

  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 0.1 to 20% by mass. If the number of straight-chain saturated fatty acids having 18 carbon atoms is more than 25% by mass, the rapid foaming property is lowered and cracking is likely to occur. In addition, the yield may be lowered due to the entrainment of bubbles in the soap that has been poured into the frame and solidified. .

The base used for the reaction with the fatty acid includes an alkali agent containing an alkali metal as a component. 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, particularly preferably 30/70 to 45/55. It is. If the potassium / sodium mass ratio is less than 1/99, the solubility and productivity may decrease, and the yield may decrease due to entrainment of bubbles. If it is greater than 1/1, the feeling after washing is poor, There is a risk of melting and collapsing.
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 70% by mass, preferably 36 to 65% by mass, and particularly preferably 38 to 60% by mass.
If the content of the component a is less than 35% by mass, sufficient foaming cannot be obtained, and solidification takes time and productivity may be reduced, and melting may occur easily. When the content of the component a exceeds 70% by mass, the solubility may be lowered, and the feeling of washing may be lowered, and the yield may be lowered due to entrainment of bubbles in the soap that has been poured into the frame and solidified. is there.

[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, or both may be used in combination. As a ratio when used in combination, dipropylene glycol / propylene glycol is preferably 7/3 to 1/9.

  Content of b component contained in the frame kneaded solid soap of this invention is 15-40 mass%, Preferably it is 15-35 mass%, Most preferably, it is 18-32 mass%. If the content of the component b is less than 15% by mass, the soap component may not be dissolved, the solidification property may be inferior, the feel of washing may be inferior, the solubility may be reduced, and the frame may be reduced. There is a possibility that the yield may be lowered by the foam entrainment in the soap that has been cast and solidified. 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 as component a, for example, when it is 10% by mass or less, more than half of the content of component b is propylene glycol It is preferable that half or less is dipropylene glycol. On the contrary, when the content of linear saturated fatty acid having 18 carbon atoms is large, for example, when it exceeds 10% by mass, half or less of the content of component b is propylene glycol and more than half is dipropylene glycol. It is preferable.

[C. water〕
The component c used in the present invention is water, and water generally used in cosmetics, pharmaceuticals, and the like, for example, purified water such as ion exchange water and distilled water is preferably used.
The content of the component c contained in the framed solid soap of the present invention is 10 to 35% by mass, preferably 15 to 34% by mass, and particularly preferably 18 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 will not be formed with a uniform composition. If it exceeds 35% by mass, the product will be too soft and productivity will be reduced. There is a risk of melting and breaking.
In addition, content of the water contained as a soap base etc. is also contained in content of water as c component.

[D. (Meth) acrylic acid alkyl ester-containing polymer]
The component d used in the present invention is a polymer (hereinafter also referred to as “PC polymer”) obtained from a monomer containing a compound represented by the following formula (I) and an alkyl (meth) acrylate. In addition, (meth) acrylic acid represents the generic name of acrylic acid and methacrylic acid.

In the formula, R ¹ is a hydrogen atom or a methyl group. R ² , R ³ and R ⁴ are each an alkyl group having 1 to 8 carbon atoms, and examples thereof include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. R ² , R ³ and R ⁴ may be the same or different. Moreover, n is an integer of 2-4. A particularly preferred PC polymer is 2-methacryloyloxyethyl phosphorylcholine (hereinafter also referred to as “MPC”) in which R ¹ , R ² , R ³ and R ⁴ are all methyl groups and n is 2. .

The (meth) acrylic acid alkyl ester is usually obtained by a reaction between (meth) acrylic acid and an alcohol. Carbon number of the alcohol residue (alkyl group) which comprises the (meth) acrylic-acid alkylester is 1-6, Preferably it is 2-5, Most preferably, it is 3-4. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, and a tert-butyl group.
Specific examples of the alkyl (meth) acrylate include, for example, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, Examples include n-butyl methacrylate.

In the monomer constituting the PC polymer, the total content of the compound represented by the formula (I) and the (meth) acrylic acid alkyl ester is 60 to 100% by mass, preferably 70 to 100% by mass, and particularly preferably 80%. ˜100 mass%.
The content ratio of the compound represented by formula (I) / (meth) acrylic acid alkyl ester is 100/0 to 10/90 (mass ratio), preferably 100/0 to 30/70 (mass ratio), Particularly preferred is 100/0 to 50/50 (mass ratio).

The weight average molecular weight of the PC polymer is preferably 10,000 to 10,000,000, particularly preferably 50,000 to 5,000,000.
The weight average molecular weight of the PC polymer can be measured, for example, by gel permeation chromatography.

When the total content of the compound represented by the formula (I) and the (meth) acrylic acid alkyl ester does not become 100% by mass, other copolymerization is possible within a range not inhibiting the effects of the present invention, for example, 5% by mass or less. Monomers can be copolymerized.
The other monomer having copolymerizability with the compound represented by the formula (I) and the (meth) acrylic acid alkyl ester is a compound having a double bond capable of addition polymerization, and does not impair the effects of the present invention. For example, olefinic hydrocarbons such as ethylene, propylene, butene, isobutene, and styrene and isomerized olefins, multimerized olefins, or olefinic compounds obtained by introducing various derivatives thereof; acrylic acid, methacrylic acid , Vinyl acetate, itaconic acid, crotonic acid, maleic acid, fumaric acid and other ethylenically unsaturated carboxylic acids and their multimers, anhydrides, esters with alcohols other than monohydric alcohols having 1 to 6 carbon atoms, or these Ethylenically unsaturated carboxylic acid introduced with carbonyl group, amino group, cyano group, nitrile group, etc. Conductors: vinyl alcohol and esters thereof with various carboxylic acids, ethers with various alcohols, or ethylenically unsaturated carboxylic acid derivatives, vinyl alcohols and the like in which a carbonyl group, amino group, cyano group, nitrile group or the like is introduced And esters of various carboxylic acids, ethers of various alcohols, or vinyl alcohol derivatives in which a carbonyl group, amino group, cyano group, nitrile group, or the like is introduced.

  Content of d component contained in the frame kneaded solid soap of this invention is 0.001-1 mass%, Preferably it is 0.005-0.5 mass%, More preferably, it is 0.01-0.3. % By mass. If the content of the d component is less than 0.001% by mass, the foam quality may not be lowered or the feeling of washing may not be obtained, and there is a possibility that bubbles may be easily mixed when solid. Moreover, when content exceeds 1 mass%, it is inferior to foaming and there exists a possibility that it may become easy to melt.

[E. Cationized polymer)
The e component used in the present invention is a cationized polymer.
Examples of the cationic polymer used in the present invention include cationized cellulose, cationized starch, cationized guar gum, cationized cod gum, cationized locust bean gum, cationized fenugreek gum, cationized xanthan gum, diallyldialkyl quaternary ammonium salt. Polymer, diallyldialkyl quaternary ammonium salt / acrylamide copolymer, diallyldialkyl quaternary ammonium salt / acrylamide / acrylic acid copolymer, vinylimidazolium trichloride / vinylpyrrolidone copolymer, hydroxyethylcellulose / dimethyldiallylammonium chloride Copolymer, vinylpyrrolidone / quaternized dimethylaminoethyl methacrylate copolymer, polyvinylpyrrolidone / alkylaminoacrylate copolymer Coalescence, polyvinylpyrrolidone / alkylamino acrylate / vinyl caprolactam copolymers, vinylpyrrolidone / methacrylamide propyl trimethylammonium chloride copolymers, alkyl acrylamide / acrylate / alkylaminoalkyl acrylamide / polyethylene glycol methacrylate copolymer, and the like.
Of these, cationized cellulose, cationized starch, cationized guar gum, diallyldialkyl quaternary ammonium salt / acrylamide copolymer, diallyldialkyl quaternary ammonium salt are preferred from the viewpoint of being less susceptible to roughness and excellent in productivity. / Acrylic acid / acrylic acid copolymer, particularly preferably cationized cellulose, diallyldialkyl quaternary ammonium salt / acrylamide copolymer, diallyldialkyl quaternary ammonium salt / acrylamide / acrylic acid copolymer.

As the cationized cellulose, for example, O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride is preferably used. Specifically, for example, Kachinal HC-100, Kachinal HC-200, Kachinal LC-200 manufactured by Toho Chemical Co., Ltd., Leogard KGP, Leoguard MGP manufactured by Lion Co., Ltd. It is done.
Examples of the diallyldialkyl quaternary ammonium salt / acrylamide copolymer include Marcoat 550, Marcoat 550PR, Marcoat 2200, and Marcoat S manufactured by Nippon Lubrizol.
Examples of the diallyldialkyl quaternary ammonium salt / acrylamide / acrylic acid copolymer include Marcoat 3331PLUS, Marcoat 3330, and Marcoat 3333 manufactured by Nippon Lubrizol.

  The content of the component e contained in the framed solid soap of the present invention is 0.01 to 1% by mass, preferably 0.05 to 0.5% by mass, more preferably 0.1 to 0.3%. % By mass. When the content of the e component is less than 0.01% by mass, the foam quality is deteriorated, it is difficult to obtain a feeling of washing, and there is a possibility that bubbles are easily mixed when solid. Moreover, when content exceeds 1 mass%, there exists a possibility that it may be inferior to foaming, the feeling of washing-up may worsen (film | membrane feeling becomes strong), and it may become easy to melt and collapse.

  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.

  Moreover, content ratio (a / c) of a component with respect to c component is 1.3-3.0, Preferably it is 1.4-2.8. If the content ratio (a / c) is less than 1.3, it may be easily melted down and the productivity may be reduced. If it exceeds 3.0, the soap component may not be sufficiently dissolved and become non-uniform. There is.

  Further, the content ratio [a / (b + c)] of the a component to the total amount (b + c) of the b component and the c component 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 and pouring into the mold during production may be reduced. There is a risk that it will be in a poor condition, and the pouring property into the mold during production will be reduced.

The frame-kneaded solid soap of the present invention preferably further contains a linear saturated fatty acid having 12 to 18 carbon atoms in addition to the components a to e. As the linear saturated fatty acid having 12 to 18 carbon atoms, a linear saturated fatty acid having any carbon number of 12 to 18 carbon atoms may be used alone, or 2 different in carbon number among 12 to 18 carbon atoms. More than one kind of linear saturated fatty acid may be used in combination, but it is preferable to use either a linear saturated fatty acid having 12 carbon atoms or a linear saturated fatty acid 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.

  When the framed solid soap of the present invention contains a linear saturated fatty acid having 12 to 18 carbon atoms, the content of the linear saturated fatty acid having 12 to 18 carbon atoms is, for example, 0.8% in the framed solid soap of the present invention. It is 1-10 mass%, Preferably it is 0.5-6 mass%, Most preferably, it is 0.5-5 mass%, More preferably, it is 1-4 mass%. By containing the linear saturated fatty acid having 12 to 18 carbon atoms in such an amount, it becomes more difficult to melt and the feeling of foaming and washing is further improved.

The framed solid soap of the present invention preferably further contains vegetable oil in addition to the components a to e. By further 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, coconut oil, soybean oil, sunflower oil and the like, and one or more selected from these vegetable oils may be used. it can. Preferred are olive oil, sunflower oil, macadamia nut oil and jojoba oil, and particularly preferred are olive oil, jojoba oil and macadamia nut oil. These vegetable oils are more preferably those that have been subjected to purification steps that are generally performed, such as deoxidation, decolorization, and deodorization.

  When the framed solid soap of the present invention contains vegetable oil, the content of the vegetable oil is, for example, 0.1 to 5% by mass in the framed solid soap of the present invention, and the vegetable oil is contained in this amount. Thus, the feeling of tension after use is reduced, the film feeling is further improved, and the moldability and stability are further improved.

  In the framed solid soap of the present invention, the component a (specific fatty acid salt) is dissolved in the component b (dipropylene glycol and / or propylene glycol) and component c (water), and the component d (specific polymer) and The soap glue obtained by uniformly dissolving the component e (cationized polymer) can be molded by pouring into a mold, cooling and solidifying in the same manner as in conventional framed soap. 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 1-6]
The frame-kneaded solid soap of Example 1 having the composition shown in Table 1 (hereinafter, also simply referred to as “solid soap”) was prepared by the following method, and Examples 2-7 and Comparative Examples 1-6 were also carried out. Solid soap was prepared in the same manner as in Example 1. In addition, the numerical value of Table 1 is content (mass%) in the solid soap at the time of evaluation.

(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 dissolution confirmation, add d component polymer, e component cationized polymer, olive oil, butylene glycol (BG), glycerin, tocopherol (natural vitamin E) and EDTA · 2Na (ethylenediaminetetraacetic acid disodium salt) to dissolve, soap I got 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.

The following compounds were used as compounds.
d component (PC polymer a)
1) Polymer d component (PC polymer b) having a weight average molecular weight of about 700,000 obtained from monomers of MPC: 80% by mass and butyl methacrylate: 20% by mass
2) Polymer having a weight average molecular weight of about 100,000 obtained from monomers of MPC: 70% by weight and butyl methacrylate: 30% by weight

e component (cationized polymer)
・ Diallyldialkyl quaternary ammonium salt / acrylamide copolymer (Product name: Marcote 550, Nippon Lubrizol Co., Ltd.)
・ Diallyldialkyl quaternary ammonium salt / acrylamide / acrylic acid copolymer (Product name: Marquat 3331PLUS, Nippon Lubrizol Co., Ltd.)
Cationized cellulose (Product name: Leogard KGP: o- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose, Lion Corporation)

(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 54.44% and M (polyhydric alcohol content) is 32%. Min) is 54.44% -32% = 22.44%.

(1) Foaming (38 ℃, hot water)
Ten women (20's to 50's) were panelists, and the speed of foaming and foam quality were evaluated based on the following criteria when solid soap was picked up and foamed with lukewarm water at about 38 ° C.
2 points ... If you feel the foaming very quickly.
1 point ... If you feel that it is a little quick and rich.
0 point: When foaming is slow or foaming is low.

Judgment was made as follows from the total score of all panelists.
16 to 20 points ... (provided that there is no panel with an evaluation of 0 points): solid soap that quickly and richly bubbles.
11 to 15 points ◯: Solid soap with slightly weak foaming.
6 to 10 points: Δ: Solid soap with weak foaming.
0 to 5 points: X: Solid soap with almost no foaming.

(2) Foaming (20 ° C, water)
Ten women (20's to 50's) were panelists, and the speed of foaming and foam quality were evaluated based on the following criteria when solid soap was picked up and foamed with cold water at about 20 ° C.
2 points ... If you feel the foaming very quickly.
1 point ... If you feel that it is a little quick and rich.
0 point: When foaming is slow or foaming is low.

Judgment was made as follows from the total score of all panelists.
16 to 20 points ... (provided that there is no panel with an evaluation of 0 points): solid soap that quickly and richly bubbles.
11 to 15 points ◯: Solid soap with slightly weak foaming.
6 to 10 points: Δ: Solid soap with weak foaming.
0 to 5 points: X: Solid soap with almost no foaming.

(3) Solubility 10 women (20's to 50's) were panelists, and the solubility was evaluated based on the following criteria when picking up solid soap and foaming with 38 ° C water.
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.
16-20 points ... (provided that there is no panel with an evaluation of 0 points): Solid soap with excellent solubility.
11 to 15 points ◯: Solid soap with slightly low solubility.
6 to 10 points: Δ: Solid soap with low solubility.
0 to 5 points: X: Solid soap with extremely low solubility.

(4) Feeling after washing Ten women (20s to 50s) 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.
16 to 20 points ... (provided that there is no panel with an evaluation of 0 points): Solid soap with excellent feel after washing.
11 to 15 points ◯: Solid soap with a good feeling after washing.
6 to 10 points: Δ: Solid soap with a slightly good feeling after washing.
0 to 5 points: X: Solid soap with poor feeling after washing.

(5) Productivity According to the above production example, after the soap glue dissolved in the container is poured into a formwork (height 420 mm, diameter 65 mm), two pieces of solidified soap are 50 mm from each upper part. And a 20 mm portion was cut off and removed from the bottom. The remaining soap was cut at an interval of 35 mm, and the cut surface was observed for biting such as bubbles and judged according to the following criteria. In addition, since 10 samples can be taken per solid soap, evaluation was performed using 20 samples for two.
Accepted product (A): Almost no foam or the like, and 19 or more products can be used.
Non-acceptable product (x): There are two or more items that cannot be commercialized because there are dents and dents on the surface due to the foam.

  In Table 1, 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, C18 is a linear saturated fatty acid having 18 carbon atoms, C18: 1 represents a monounsaturated fatty acid having 18 carbon atoms, and C12-C18 represents a total of linear saturated fatty acids having 12 to 18 carbon atoms. DPG represents dipropylene glycol, PG represents propylene glycol, and BG represents butylene glycol.

  From the results of Examples 1 to 7 shown in Table 1, all of the frame-kneaded solid soaps of the present invention are quickly and richly foamed in both hot water and water, excellent in solubility, excellent in the feel of washing, It can be understood that the soap has few bubbles and is excellent in productivity.

On the other hand, in Comparative Examples 1-6, sufficient performance is not obtained.
Specifically, in Comparative Example 1, since the content of the component a is small, the content of b + c is large, and the mass ratio of a / c is small, it is inferior in terms of foaming and productivity.
In Comparative Example 2, the content of the component a is large, the content of the component b is small, the content of b + c is small, the mass ratio of a / c and the mass ratio of a / (b + c) is large, It is inferior in the feel of washing and productivity.
In Comparative Example 3, the content of the b component is large, the e component is not contained, and the mass ratio of a / c is large, so that the feeling after washing is insufficient and the productivity is inferior.

In Comparative Example 4, since the component d is not contained, foaming at low temperatures is inferior, solubility and a feeling of washing are insufficient, and productivity is inferior.
In Comparative Example 5, since the total amount of the linear saturated fatty acid having 12 to 18 carbon atoms in the component a is small, the content of the component a is small, and the mass ratio of a / c is small, in terms of foaming and productivity Inferior and poor solubility.
In Comparative Example 6, the total amount of the linear saturated fatty acid having 12 to 18 carbon atoms in the component a is small, the fatty acid salt is only a sodium salt, the content of the components b and e is small, and the content of b + c is Since it is few, it is inferior in terms of foaming, solubility, feeling of washing, and productivity.

Claims (1)

The a component shown below is 35 to 70% by mass, the b component is 15 to 40% by mass, the c component is 10 to 35% by mass, the d component is 0.001 to 1% by mass, and the e component is 0.01 to 1% by mass. The total amount of component b and component c (b + c) is 35 to 65% by mass, the content ratio of component a to component c (a / c) is 1.3 to 3.0, and b A framed solid soap in which the content ratio [a / (b + c)] of the component a to the total amount (b + c) of the component and component 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 30 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. A polymer obtained from a monomer containing a compound represented by the formula (I) and a (meth) acrylic acid alkyl ester in a total amount of 60 to 100% by mass, the compound represented by the formula (I) / (meth) acrylic acid Polymer in which content ratio of alkyl ester is 100/0 to 10/90 in mass ratio e. Cationized polymer

(In the formula, R ¹ is a hydrogen atom or a methyl group, R ² , R ³ and R ⁴ are each an alkyl group having 1 to 8 carbon atoms, and n is an integer of 2 to 4).