TWI673358B - Solid soap composition containing microemulsion - Google Patents

Abstract

The solid soap composition of the present invention contains (A) a soap base and (B) a microemulsion containing the following components (b1) to (b3): (b1) selected from the group consisting of a nonionic surfactant and an anionic surfactant Groups of at least one surfactant, (b2) at least one oily component, and (b3) water.

Description

   Microemulsion-containing solid soap composition   

The present invention relates to a solid soap composition, a method for producing the same, and a foam improving agent for the solid soap composition.

As a skin cleansing composition for the face, body, etc., a solid soap composition containing a fatty acid salt as a main component is widely used. In addition to the detergency, the skin detergent composition is more important in that it has a good feeling of use, and thus requires good foam quality and foam durability (foam durability). For example, when the foam persistence is poor and the foam disappears immediately, the elasticity of the foam cannot be maintained during washing, resulting in poor use feeling and no clean feeling. In addition, once the foam disappears immediately, it causes a burden on the skin due to the friction between the skin (hand and face, etc.). Therefore, the more durable the foam, the better. As far as foam quality is concerned, foams with elasticity and stretchability are generally regarded as good quality foams; for solid soap compositions, some people have also studied the improvement of foam quality. For example, Patent Document 1 describes a detergent composition comprising a fatty acid soap portion and a granulated product containing a water-soluble polymer having a foaming effect.

The microemulsion system has a transparent or translucent appearance, is stable without separation, and has the property of being able to mix water-soluble components and oil at the same time. Based on this property, microemulsions are used in the preparation of cosmetic, liquid or gel detergent compositions. Patent Literature 2 describes a cosmetic detergent composition containing a microemulsion containing an alkyl (oligomeric) glycoside or the like, an anionic surfactant, a cationic polymer, and the like.

    [Advanced technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent Laid-Open No. 2013-1860

[Patent Document 2] Japanese Patent Publication No. 2014-520770

In the detergent composition of Patent Document 1, a water-soluble polymer is blended to improve foam quality. However, Patent Literature 1 does not describe a microemulsion. In Patent Document 2, no research has been conducted to improve the foam quality or foam durability of a solid soap composition. Microemulsion-doped solid soap compositions are not known.

The present invention aims to provide a solid soap composition with good foam quality and foam durability, and a method for producing the same.

As a result of intensive research conducted by the inventors of the present invention to solve the above-mentioned problems, it has been found that by blending a microemulsion with a solid soap composition containing a soap base, foam quality and foam durability can be improved (improved). It is an amazing discovery that microemulsion can improve the foam quality and foam durability of solid soap compositions.

The present invention relates to the following solid soap compositions and the like.

The solid soap composition of the present invention contains (A) a soap base and (B) a microemulsion containing the following components (b1) to (b3):

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

The solid soap composition of the present invention, by containing microemulsion together with the soap base, has elasticity and thread-drawing property during washing, and can form a fine and excellent foam. In addition, since the foam has good durability, the elasticity of the foam can be maintained during washing, and the feeling of use is excellent. Furthermore, a good washing feeling can be obtained. In this specification, a microemulsion containing the above-mentioned components (b1) to (b3) is also simply referred to as a microemulsion.

The blending amount of the (B) microemulsion is preferably 0.15 to 5% by mass in the solid soap composition.

By blending the above-mentioned amount of microemulsion, the foam of the solid soap composition becomes better, and a foam with better elasticity and stringability is formed. Moreover, it can further improve the sustainability of the bubble.

In this specification, the blending amount (% by mass) of each component of the solid soap composition ((A) soap base, (B) microemulsion, and other ingredients blended as required), if not specifically described before Is the blending amount of 100% by mass of the solid soap composition.

In the solid soap composition of the present invention, the (B) microemulsion preferably further comprises (b4) a monohydric alcohol having 1 to 4 carbon atoms and / or (b5) a polyhydric alcohol.

The form of the solid soap composition of the present invention is preferably solid, flake, powder, or granular.

In one aspect of the present invention, it is preferable that the microemulsion is an oil-in-water (O / W type) microemulsion, and the non-ionic surfactant is a polyoxyethylene alkyl ether selected from HLB of 10-20. , Polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl fatty acid ester, polyoxyethylene hydrogenated castor oil, polyglyceryl fatty acid ester, and polyether modified polysilicon At least one of the groups formed by oxygen.

In one form, it is preferred that the microemulsion is an oil-in-water (O / W type) microemulsion, and the anionic surfactant is selected from the group consisting of polyoxyethylene alkyl ether phosphate salt and N-fluorenylglutamine. At least one of the group consisting of an acid salt, and polyoxyethylene alkyl ether phosphoric acid or a salt thereof.

In one aspect, the microemulsion is an oil-in-water (W / O type) microemulsion. In another aspect, it is preferable that the nonionic surfactant is selected from the group consisting of HLB of 1 to 7. Polyoxyethylene difatty acid ester, monoglycerol monofatty acid ester, monoglycerol difatty acid ester, diglycerol monofatty acid ester, and polyether modified polysiloxane.

The method for producing a solid soap composition of the present invention includes at least a step of kneading a (A) soap base and (B) a microemulsion containing the following ingredients (b1) to (b3) to prepare a soap base composition;

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

According to the manufacturing method of the present invention, the solid soap composition of the present invention described above can be manufactured.

In the manufacturing method of the present invention, the blending amount of the (B) microemulsion is preferably 0.15 to 5% by mass in the solid soap composition.

The foam improving agent of the solid soap composition of the present invention uses microemulsions containing the following components (b1) to (b3) as effective ingredients: (b1) selected from the group consisting of a nonionic surfactant and an anionic surfactant At least one surfactant, (b2) at least one oily component, and (b3) water.

The foam improver of the solid soap composition of the present invention can improve the foam quality of the solid soap composition by blending it with, for example, a solid soap composition. In addition, the foam durability of the solid soap composition can be improved.

The present invention also includes the use of a microemulsion containing the above-mentioned ingredients (b1) to (b3) to improve the foam quality of a solid soap composition.

According to the present invention, there can be provided a solid soap composition having excellent foam quality and foam durability, and a method for producing the same.

    [Form of Implementing Invention]    

Hereinafter, the present invention will be specifically described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and applied without departing from the gist of the present invention.

The solid soap composition of the present invention contains (A) a soap base and (B) a microemulsion containing the following components (b1) to (b3):

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

The solid soap composition of the present invention has good foam quality and foam persistence by containing a soap base and microemulsion. By blending microemulsion, the foam quality of the solid soap composition can be improved, and the foam consistency can be improved. The solid soap composition of the present invention has elasticity and thread-drawing property during washing, and can form a fine and excellent foam. In addition, since the foam has good durability, the elasticity of the foam can be maintained during washing. Therefore, for example, when the skin is cleaned, a good feeling of use can be obtained because the feel of the foam is good and the foam is good in durability. Also, a good washing feeling can be obtained.

    <(A) Soap base>    

The soap base in the present invention may be any base for soaps used in general solid soap compositions, and fatty acid alkali salts are preferably used. The fatty acid alkali salt may be one kind or two or more kinds. The fatty acid in the fatty acid alkali salt is preferably a fatty acid having 8 to 22 carbon atoms. The soap base in the present invention is preferably a fatty acid alkali salt having 8 to 22 carbon atoms, and one or two or more kinds of the fatty acid alkali salt can be used. The carbon number of the fatty acid is more preferably 10 to 20, and even more preferably 12 to 18. Fatty acids can be linear or branched. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid. Examples of the fatty acid include saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, and the like; unsaturated fatty acids such as oleic acid, linoleic acid, oleic acid, and ricinoleic acid; Coconut oil fatty acids, palm oil fatty acids, palm kernel oil fatty acids, tallow fatty acids, hardened tallow fatty acids, tar oil fatty acids, and the like which belong to these mixtures. Among them, lauric acid, myristic acid, palmitic acid, stearic acid, palm kernel oil fatty acid, and the like are preferred.

Examples of the base of the fatty acid alkali salt include alkali metals such as sodium and potassium; organic amines such as ethanolamine, and the like; among these, sodium and potassium are more preferred, and sodium is even more preferred. The content of the fatty acid sodium salt in 100% by mass of the fatty acid alkali salt used as the soap base is preferably 50 to 100% by mass, and more preferably 55 to 100% by mass.

As the fatty acid base salt in the present invention, sodium salts, potassium salts, and triethanolamine salts of saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid are preferred, and more preferably Sodium and potassium salts of lauric acid, myristic acid, and palmitic acid, and the like, and more preferred are sodium salts of lauric acid, myristic acid, and palmitic acid. These may be used singly, or two or more kinds may be used.

The fatty acid alkali salt used as a soap base can be prepared by a known method such as a saponification method and a neutralization method using the above-mentioned fatty acid.

    <(B) Microemulsion>    

The microemulsion system in the present invention contains the following components (b1) to (b3):

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

The microemulsion in the present invention may be an oil-in-water type (O / W type) microemulsion, or may be an oil-in-water type (W / O type) microemulsion. O / W microemulsion and W / O microemulsion can be used together. As an example, the pH of the microemulsion is preferably 9 to 11.

    <Oil-in-water type (O / W type) microemulsion>    

In O / W microemulsions, the external phase is an aqueous phase. The O / W type microemulsion preferably contains the above-mentioned component (b1) at 0.1 to 20% by mass, the above-mentioned component (b2) at 0.01 to 10% by mass, and the above-mentioned component (b3) at 50 to 99% by mass. . In the present invention, the content (% by mass) of the components (b1) to (b3) is the content in 100% by mass of the microemulsion.

In the case of an O / W type microemulsion, the nonionic surfactant in the component (b1) is preferably a nonionic surfactant having an HLB of 10 to 20. In the case of O / W type microemulsion, the component (b1) is preferably at least one surfactant selected from the group consisting of an anionic surfactant and a nonionic surfactant having an HLB of 10 to 20. Anionic surfactants and non-ionic surfactants with HLB of 10-20 can be used individually or in combination of two or more. When it is an O / W type microemulsion, the component (b1) preferably contains a nonionic surfactant with an HLB of 10-20, (b1) preferably contains a nonionic surfactant with an HLB of 10-20, or HLB is 10 ~ 20 non-ionic surfactant and anionic surfactant. In the O / W type microemulsion, the component (b1) preferably contains 80% by mass or more of a nonionic surfactant having an HLB of 10 to 20, more preferably 90% by mass or more, for example, preferably contains 80 to 80% by mass. 100% by mass, more preferably 90 to 100% by mass. In one aspect, the upper limit of the content of the nonionic surfactant having an HLB of 10 to 20 may be 99.99% by mass or less in the component (b1), and may also be 99.9% by mass or less than 99% by mass. In one aspect, the content of the anionic surfactant in the component (b1) is preferably 20% by mass or less, and more preferably 10% by mass or less. When the component (b1) contains an anionic surfactant, as an example, the content of the component (b1) is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and for example, preferably 0.01 to 20% by mass %, More preferably 0.1 to 10% by mass.

In the present invention, HLB (hydrophilic-lipophilic balance) is an HLB value calculated by the Griffin method.

Examples of the nonionic surfactant having an HLB of 10 to 20 include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether, and polyoxyethylene fatty acid ester. , Polyoxyethylene sorbitan fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol tetrafatty acid ester, polyglyceryl fatty acid ester, sucrose fatty acid ester, alkyl (Poly) glycosides, N-alkyldimethylamine oxides, polyoxyethylene glycerol fatty acid esters, polyether modified polysiloxanes, and the like. These may be used individually by 1 type, and may use 2 or more types together.

The nonionic surfactant used as the component (b1) of the O / W type microemulsion is more preferably a nonionic surfactant having an HLB of 12-20.

As nonionic surfactants having an HLB of 10 to 20, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene glyceryl fatty acids are more preferred. Ester, polyoxyethylene hydrogenated castor oil, polyglyceryl fatty acid ester, polyether modified polysiloxane, etc. These may be used individually by 1 type, and may use 2 or more types together. If an O / W type microemulsion containing such a nonionic surfactant with an HLB of 10 to 20 is used, the foam quality of the solid soap composition is better, and the foam durability can be further improved. Among them, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, and the like are more preferred. If an O / W type microemulsion containing such a nonionic surfactant having an HLB of 10 to 20 is used, the foamability of the solid soap composition can be improved, and rapid foamability and foamability can be improved. Therefore, it is preferable.

As for the polyoxyethylene alkyl ether, an alkyl group having 8 to 40 carbon atoms is preferred, and the average addition mole number of the oxyethylene group (hereinafter referred to as EO) is 10 to 50. For example, polyoxyethylene octyl ether, polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene palmyl ether, polyoxyethylene isostearyl ether, polyoxyethylene stearyl ether, polyoxyethylene Ethyl oleyl ether, polyoxyethylene cholesterol ether, etc. Among them, those having an alkyl group having 12 to 40 carbons and an average addition mole number of EO of 10 to 30 or 15 to 30 are more preferable, and for example, polyoxyethylene cholesterol-based ether is more preferable.

The polyoxyethylene alkylphenyl ether is preferably one having an alkyl group having 8 to 22 carbon atoms and the average addition mole number of EO is 10 to 50. Examples include polyoxyethylene octyl group. Phenyl ether, polyoxyethylene nonylphenyl ether, and the like. Among them, an alkyl group having 12 to 20 carbon atoms and an average addition mole number of EO of 15 to 30 are preferred.

As for the polyoxyethylene polyoxypropylene alkyl ether, an alkyl group having 8 to 22 carbon atoms is preferred, and the average addition mole number of EO is 10 to 50 (preferably 20 to 40), oxygen The average addition mole number of propylene groups (hereinafter referred to as PO) is 5 to 10. Examples include polyoxyethylene polyoxypropylene octyl ether, polyoxyethylene polyoxypropylene decyl ether, and polyoxyethylene polyoxypropylene. Oxypropylene decyl tetradecyl ether.

The polyoxyethylene fatty acid ester is preferably a fatty acid having 8 to 22 carbon atoms and the average addition mole number of EO is 10 to 50. Examples include polyoxyethylene caprylate, poly (ethylene octanoate) Oxyethylene laurate, polyoxyethylene myristate, polyoxyethylene palmitate, polyoxyethylene isostearate, polyoxyethylene stearate, polyoxyethylene oleate, and the like. Among them, a fatty acid having 12 to 20 carbon atoms and an average addition mole number of EO of 10 to 30 are preferred, and more preferably, for example, polyoxyethylene oleyl ether.

The polyoxyethylene sorbitan fatty acid ester is preferably a fatty acid having 8 to 22 carbon atoms and the average addition mole number of EO is 10 to 50. Examples include polyoxyethylene sorbitan Sugar octanoate, polyoxyethylene sorbitan laurate, polyoxyethylene sorbitan myristate, polyoxyethylene sorbitan palmitate, polyoxyethylene sorbitan isohard Fatty acid esters, polyoxyethylene sorbitan stearate, polyoxyethylene sorbitan oleate (also known as polyoxyethylene sorbitan monooleate, polyolethoxylate sorbitol monooleate Anhydride) and so on. Among them, a fatty acid having 12 to 20 carbons is preferred, and the average addition mole number of EO is 10 to 30, and more preferably, for example, polyoxyethylene sorbitan monooleate (for example, polyoxyethylene) (20) sorbitan monooleate (Polysorbate 80)), polyoxyethylene sorbitan monostearate (e.g. polyoxyethylene (20) sorbitan monostearate (polysorbate) Esters 60)) and the like.

In the case of polyoxyethylene castor oil and polyoxyethylene hydrogenated castor oil, the average addition mole number of EO is preferably 10 to 80, and more preferably 30 to 70.

The polyoxyethylene sorbitol tetrafatty acid ester is preferably a fatty acid having 8 to 22 carbon atoms and the average addition mole number of EO is 10 to 50. Examples include polyoxyethylene sorbitol Sugar alcohol tetracaprylate, polyoxyethylene sorbitol tetraoleate, and the like. Among them, those having a carbon number of 12 to 20 and an average addition mole number of EO of 10 to 30 are preferred.

The polyglyceryl fatty acid ester is preferably one having a fatty acid having 12 to 22 carbon atoms. In addition, as an example, a polyglyceryl fatty acid ester having a degree of polymerization of glycerin of 5 to 12 can be mentioned. Examples of the polyglyceryl fatty acid ester include decaglyceryl monostearate. The sucrose fatty acid ester is preferably one having a fatty acid having 12 to 22 carbon atoms, and examples thereof include sucrose stearate.

Examples of the alkyl (poly) glycoside include an alkyl group having 8 to 22 carbon atoms, and examples thereof include a decyl glycoside and a lauryl glycoside. In one form, the microemulsion is preferably free of alkyl (poly) glycosides. When the alkyl (poly) glycoside is contained, for example, yellowing may occur over time in a light-colored solid soap soap composition.

As the polyoxyethylene glycerol fatty acid ester, a polyoxyethylene glycerol monofatty acid ester having a fatty acid with 8 to 22 carbon atoms and an average addition amount of EO of 10 to 50 is preferable. For example, polyoxyethylene glyceryl monocaprylate, polyoxyethylene glyceryl monolaurate, polyoxyethylene glyceryl monomyristate, polyoxyethylene glyceryl monopalmitate, polyoxyethylene glyceryl monoisostearate (iso Polyoxyethylene glyceryl stearate), polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl monooleate, and the like. Among them, those having a fatty acid having 12 to 18 carbons and an average addition mole number of EO of 15 to 30 are preferred, and for example, polyoxyethylene glycerol monoisostearate is preferred.

As for the polyether modified polysiloxane having an HLB of 10 to 20, polyoxyethylene having an average addition amount of EO of 10 to 50 as a polyether group is preferred, and examples thereof include EO The average number of additions is polyoxyethylene ‧ polymethylsiloxane copolymer (for example, PEG-12 Dimethicone, etc.) with a mole number of 10-50.

Examples of the anionic surfactant include fatty acid salts, alkyl ether carboxylates, fluorenyl lactate, N-fluorenyl sarcosinate, N-fluorenyl glutamate, and N-fluorenyl methylalanine. Salt, N-fluorenyl methyl taurate, alkane sulfonate, α-olefin sulfonate, α-sulfonic acid fatty acid methyl ester salt, alkyl sulfonate succinate, fluorenyl isethionate Salt, alkyl sulfate, alkyl ether sulfate, polyoxyethylene alkyl ether sulfate, fatty acid alkanolamine sulfate, monofluorenyl glyceryl sulfate, monoalkyl phosphate, polyoxylate Ethylene alkyl ether phosphoric acid or a salt thereof, polyoxyethylene alkyl ether phosphoric acid ester salt, and the like. These may be used singly, or two or more kinds may be used.

Examples of the salt include alkali metal salts such as sodium and potassium; organic amine salts such as ethanolamine; and the like, more preferred are sodium and potassium salts, and even more preferred are sodium salts.

Among the anionic surfactants, polyoxyethylene alkyl ether phosphate, N-fluorenyl glutamate, polyoxyethylene alkyl ether phosphate or a salt thereof is preferred, and polyoxyethylene alkyl ether phosphate or Its salt.

Examples of the fatty acid salt include a fatty acid alkali salt having 8 to 22 carbon atoms, a metal soap, and the like.

Examples of the alkyl ether carboxylate include an alkyl ether carboxylate having 8 to 22 carbon atoms in the alkyl group, or a polyoxyethylene alkyl ether carboxylate.

For fluorenyl lactate, N-fluorenyl sarcosinate, N-fluorenyl glutamate, N-fluorenyl methyl alanine, N-fluorenyl methyl taurate, fluorenyl isethionate Acid salt and monofluorenyl glycerol sulfate ester salt, and preferably, for example, the carbon number of the fluorenyl group is 8-22.

For alkane sulfonates, α-olefin sulfonates, α-sulfonic acid fatty acid methyl ester salts, alkyl sulfosuccinates, alkyl sulfates, alkyl ether sulfates, polyoxyethylene alkyls The ether sulfate, fatty acid alkanolamine sulfate, and monoalkyl phosphate are preferably, for example, those having 8 to 22 carbon atoms. The polyoxyethylene alkyl ether sulfate is preferably, for example, one having an average addition mole number of EO of 5 to 50.

In the case of polyoxyethylene alkyl ether phosphoric acid or a salt thereof, for example, an alkyl group having 8 to 22 carbon atoms is preferred, and the average addition mole number of EO is 5 to 50, more preferably having a carbon number. Alkyl groups of 12-20, and the average number of moles of EO is 5-20. Examples thereof include polyoxyethylene lauryl ether phosphoric acid, polyoxyethylene tridecyl ether phosphoric acid, polyoxyethylene myristyl ether phosphoric acid, polyoxyethylene pentadecyl ether phosphoric acid, and salts thereof. As for the polyoxyethylene alkyl ether phosphoric acid or a salt thereof, it is also suitable to use a dioxyethylene (POE) (8) (C12-15) alkyl ether phosphoric acid or a salt thereof.

The polyoxyethylene alkyl ether phosphate salt is preferably one having an alkyl group having 8 to 22 carbon atoms and the average addition mole number of EO is 10 to 50. Examples include polyoxyethylene decyl Ether phosphate salts, polyoxyethylene lauryl ether phosphate salts, and the like.

The oily component used as a component (b2) is not specifically limited. For example, a user generally used in cosmetics may be preferably used. The oily component of the component (b2) is preferably one or more kinds of oils selected from the group consisting of vegetable oils, animal oils, ester oils, ether oils, higher fatty acids, silicone oils, essential oils, and hydrocarbon oils.

The oily component may be used singly or in combination of two or more kinds.

Examples of the vegetable oil include olive oil, argan oil, jojoba oil, linseed oil, camellia oil, sunflower oil, almond oil, rapeseed oil, sesame oil, soybean oil, peanut oil, avocado oil, and grape seeds Oil, castor oil, shea butter, etc.

Examples of the animal oil include horse oil.

Examples of the ester oil include octyldodecyl myristate, isopropyl palmitate, butyl stearate, myristyl myristate, isopropyl myristate, and di-2-ethyl adipate Hexyl ester, diisopropyl sebacate, neopentyl glycol didecanoate, triisooctyl alcohol, cetyl ethylhexanoate and the like.

Examples of the ether oil include dioctyl ether, cetyldimethylbutyl ether, ethylene glycol octyl ether, ethylene glycol dioctyl ether, and glycerol monooleyl ether.

Examples of higher fatty acids include eicosenoic acid, isomyristic acid, and capric acid.

Examples of the silicone oil include dimethyl polysiloxane, cyclic dimethyl polysiloxane, methylphenyl polysiloxane, amino-modified polysiloxane, epoxy-modified polysiloxane, Carboxy modified polysiloxane, alcohol modified polysiloxane, alkyl modified polysiloxane, polyether modified polysiloxane, fluorine modified polysiloxane, etc.

Examples of the essential oil include orange oil and lavender oil.

Examples of the hydrocarbon oil include flowing paraffin, squalane, squalene, and n-hexadecane.

In one aspect, the oily component of the component (b2) used in the O / W type microemulsion is preferably, for example, a melting point of 60 ° C or lower, and more preferably 50 ° C or lower.

In addition, when the internal phase (oily phase) of the O / W type microemulsion uses a monohydric alcohol of the component (b4) and / or a polyhydric alcohol of the component (b5) described below, it is preferable to select a boiling point of the alcohol used below, Dissolved in this alcohol. For example, when ethanol is used as the component (b4) and the component (b4) is contained in the internal phase of the O / W type microemulsion, an oily component having a melting point of 78 ° C. or lower is preferably used.

The oily ingredient to be blended in the microemulsion can be appropriately selected depending on the properties and the like desired of the solid soap composition. In one aspect, as the oily component to be used for the component (b2), a vegetable oil is preferred, and argan oil, jojoba oil, olive oil, and the like are more preferred. For example, when using argan oil and jojoba oil, the moisturizing effect of the solid soap composition can be improved. In addition, when using, for example, olive oil, it is possible to enhance the washing effect of the solid soap composition to remove makeup (makeup) and sebum dirt.

In the present invention, by adding an oily component to the microemulsion, it is possible to impart a moisturizing effect, a washing effect, and the like to the solid soap composition to the oily component.

As the water used as the component (b3), tap water, ion-exchanged water, distilled water, and the like can be used, and ion-exchanged water and distilled water are preferred.

In the case of O / W type microemulsion, the content of component (b1) is more preferably 0.15 to 10% by mass, and even more preferably 0.3 to 5% by mass. The content of the component (b2) is preferably 0.05 to 5% by mass, and more preferably 0.07 to 1% by mass. The content of the component (b3) is more preferably 60 to 95% by mass, and even more preferably 70 to 90% by mass.

The blending ratio of the component (b1) and the component (b3) is preferably (b1) / (b3) = 1/100 to 1/10, and more preferably 1/100 to 1/50 in terms of mass ratio. The blending ratio of the component (b2) and the component (b3) is preferably (b2) / (b3) = 1/1000 to 1/50, and more preferably 1/900 to 1/100 in terms of mass ratio.

    <Water-in-oil (W / O type) microemulsion>    

In the solid soap composition of the present invention, as the above microemulsion, a W / O type microemulsion can also be used. In O / W microemulsions, the external phase is an oily phase. The W / O type microemulsion preferably contains the above-mentioned component (b1) at 0.1 to 20% by mass, the above-mentioned component (b2) at 50-99% by mass, and the above-mentioned component (b3) at 0.01 to 10% by mass. The content (% by mass) of the components (b1) to (b3) is the content (% by mass) of 100% by mass of the microemulsion. In one aspect, the content of the component (b3) may be 0.001 to 10% by mass.

In the case of a W / O type microemulsion, the nonionic surfactant in the component (b1) is preferably a nonionic surfactant having an HLB of 1 to 7. Non-ionic surfactants with HLB of 1 to 7 can be used alone or in combination of two or more. As an example, the content of the non-ionic surfactant having an HLB of 1 to 7 in the component (b1) is preferably 90% by mass or more, more preferably 95% by mass or more, for example, preferably 90 to 100% by mass, more It is preferably 95 to 100% by mass. When it is a W / O type, the component (b1) is preferably a nonionic surfactant having an HLB of 1 to 7.

Examples of the nonionic surfactant having an HLB of 1 to 7 include polyoxyethylene difatty acid ester, monoglycerol monofatty acid ester, monoglycerol difatty acid ester, diglycerol monofatty acid ester, and monoglycerol monoalkane. Ether, diglycerol monoalkyl ether, sorbitan fatty acid ester, polyether modified polysiloxane, etc. These may be used individually by 1 type, and may use 2 or more types together.

The monoglycerol monofatty acid ester and monoglycerol difatty acid ester are preferably glycerol, a mono- or diester with a fatty acid having 8 to 22 carbon atoms, and are preferably monoglycerol caprylate, monoglycerol 2- Ethylhexanoate, monoglyceryl decanoate, monoglyceryl laurate, monoglyceryl myristate, monoglyceryl palmitate, and the like.

The salt of diglycerol monofatty acid ester is preferably diglycerin and an ester of a fatty acid having 8 to 22 carbon atoms. Examples thereof include diglycerol caprylate, diglycerol laurate, diglycerol myristate, Diglyceryl palmitate and the like.

The monoglyceryl monoalkyl ether is preferably an ether of glycerol and an alkyl group having 8 to 22 carbon atoms, and examples thereof include monoglyceryl octyl ether, monoglyceryl decyl ester, monoglyceryl lauryl ether, and monoglycerol. Glyceryl myristyl ether, monoglyceryl palmityl ether and the like.

The diglycerol monoalkyl ether is preferably an ether of diglycerol and an alkyl group having 8 to 22 carbon atoms, and examples thereof include diglyceryl octyl ether, diglyceryl lauryl ether, diglyceryl myristyl ether, Diglyceryl palmityl ether and the like.

The sorbitan fatty acid ester is preferably an ester of a fatty acid having 8 to 22 carbon atoms, and examples thereof include sorbitan octanoate, sorbitan octanoate, and sorbitan decanoate. Acid esters, sorbitan laurate, sorbitan myristate, sorbitan palmitate, and the like.

As for the polyether modified polysiloxane having an HLB of 1 to 7, it is preferable to have a polymer having an average addition number of EO of 10 to 20 and an average addition number of PO of 1 to 10. As the polyether group, as an oxyethylene polyoxypropylene group, for example, a hexadecyl polydimethylsiloxane copolyol (Cetyl PEG / PPG-10 / 1 dimethicone) and the like can be mentioned.

Among these, as for the nonionic surfactant having an HLB of 1 to 7, polyoxyethylene difatty acid ester, monoglycerol monofatty acid ester, monoglycerol difatty acid ester, diglycerol monofatty acid ester, poly Ether modified polysiloxane, more preferably polyether modified polysiloxane. If a microemulsion containing such a nonionic surfactant with an HLB of 1 to 7 is used as the W / O type microemulsion, the foam quality and foam durability of the solid soap composition will be better, so it is better. In addition, it is preferable because the foamability of the solid soap composition can be improved, and the rapid foamability and foamability can be improved.

As the component (b2) in the W / O type microemulsion, the same as the component (b2) used in the O / W type microemulsion mentioned above can be mentioned, and it can select suitably. The component (b2) may be used singly or in combination of two or more kinds. Among them, those having a melting point of 60 ° C. or lower, more preferably 50 ° C. or lower; vegetable oils, more preferably olive oil, jojoba oil, argan oil, and the like.

In the case of a W / O type microemulsion, the content of the component (b1) is more preferably 0.15 to 10% by mass, and even more preferably 0.5 to 5% by mass. The content of the component (b2) is more preferably 60 to 99% by mass, and even more preferably 70 to 99% by mass. The content of the component (b3) is preferably 0.05 to 5% by mass, and more preferably 0.07 to 1% by mass.

In the microemulsion (O / W type and W / O type) in the present invention, any component other than the above-mentioned components (b1) to (b3) may be appropriately blended as long as the effects of the present invention are not impaired.

For example, the microemulsion preferably further contains (b4) a monohydric alcohol having 1 to 4 carbon atoms (hereinafter also referred to as component (b4)). The component (b4) is a solvent suitable as a surfactant and an oily component. When the component (b4) is used, it is easier to form a microemulsion, and it is preferable to be stable. Examples of the monohydric alcohol having 1 to 4 carbon atoms include methanol, ethanol, n-propanol, isopropanol, and butanol. These may be used singly or in combination of two or more kinds. Among these, ethanol is preferred.

When the microemulsion contains ingredient (b4), its content in the microemulsion is preferably 0.01 to 20% by mass, more preferably 0.1 to 20% by mass, more preferably 1 to 20% by mass, and even more preferably 2 to 15 quality%.

The microemulsion may further contain (b5) a polyol (hereinafter also referred to as component (b5)). The microemulsion preferably contains ingredients (b4) and / or (b5). The polyhydric alcohol is preferably, for example, a polyhydric alcohol having 2 to 10 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms, and particularly preferably a polyhydric alcohol having 2 to 4 carbon atoms. .

The component (b5) is a solvent suitable as a surfactant and an oily component. When the component (b5) is used, it is easier to form a microemulsion, and it is preferable to be stable. The polyhydric alcohol is preferably a compound having two or more hydroxyl groups that can be blended in cosmetics and the like, and examples thereof include ethylene glycol, 1,2-propanediol (propylene glycol), 1,3-propanediol (propylene glycol), Glycols such as 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, and dipropylene glycol; trihydrins such as glycerol (glycerol) Alcohols; tetraols such as diglycerol. These may be used singly or in combination of two or more kinds. Among these, a dihydric or trihydric alcohol is preferable, and 1,3-propanediol, 1,3-butanediol, etc. are preferable.

When the microemulsion contains ingredient (b5), its content in the microemulsion is preferably 0.01 to 20% by mass, preferably 0.1 to 20% by mass, more preferably 1 to 20% by mass, and even more preferably 2 to 15 quality%.

When the microemulsion contains the component (b4) and / or the component (b5), in one form, the total content of the component (b4) and the component (b5) in the microemulsion is preferably 0.01 to 30% by mass, more preferably It is 0.02 to 30% by mass, more preferably 0.1 to 25% by mass, more preferably 0.2 to 25% by mass, even more preferably 1 to 25% by mass, and even more preferably 2 to 20% by mass.

In addition to the above ingredients, microemulsions may contain any ingredients such as humectants, softeners, cationic surfactants, tackifiers, pH adjusters, antioxidants, preservatives, flavors, pigments, plant extracts, etc. 1 or more. The microemulsion may also contain an amphoteric surfactant, and in one form, it is preferred that it does not contain an amphoteric surfactant. When an amphoteric surfactant is contained, the stability of the microemulsion may decrease.

The microemulsion in the present invention is a thermodynamically stable single-phase composition containing the above-mentioned surfactant, oily component, and water. The microemulsion in the present invention is usually a single-phase solution in which the appearance is transparent or translucent, and all the blended components are uniformly dissolved, as far as its properties are concerned. It can usually be confirmed by visual inspection as a single phase.

In one aspect, the average particle diameter of the dispersed particles of the microemulsion in the present invention is preferably 10 to 200 nm, and more preferably 30 to 150 nm. The average particle diameter referred to here refers to a value measured by a laser diffraction / scattering method, and is a median particle diameter (D50) of the intensity distribution of scattered light. If the average particle diameter of the dispersed particles is within the above range, it is generally preferred that the microemulsion is transparent or translucent.

    <Micro-latex preparation method>    

The method for preparing the microemulsion is not particularly limited. For example, the method described below can be used.

(1) Weigh the components of the internal phase contained in the microemulsion, mix and stir to prepare a uniform solution of the internal phase components. At this time, heating can also be performed as required. In particular, when a solid substance is contained in a component belonging to the internal phase, it is preferable to heat it to sufficiently dissolve it.

(2) The components of the external phase are weighed. At this time, heating may also be performed as required. When a solid substance is contained in the components belonging to the external phase, it is preferable to heat it to sufficiently dissolve to form a uniform solution of the external phase components.

(3) While stirring the solution of the external phase component of (2), slowly add the solution of the internal phase component prepared in (1).

(4) Stir until visually single phase.

In the above (4), if it is regarded as a single phase (also sometimes transparent or translucent, slightly blue-white), microemulsion has usually been formed. If necessary, a step of adjusting the microemulsion to a predetermined pH (preferably 9 to 11) may be performed.

The optional components (component (b4), component (b5), etc.) added as described above are mixed and blended when preparing a solution of an internal phase component, or blended and blended when preparing a solution of an external phase component.

For example, in the case of an O / W type microemulsion, components (b1) and (b2) are usually used as components belonging to the internal phase, and component (b3) is used as components belonging to the external phase.

When preparing an O / W type microemulsion, first, components (b1) and (b2) are mixed to prepare a uniform solution containing components (b1) and (b2). When preparing the solution, heating can also be performed as required. Next, while stirring the component (b3), a uniform solution containing the components (b1) and (b2) is slowly added. After the addition, O / W type microemulsion can be obtained by stirring.

The optional components (components (b4), (b5), etc.) added as required are mixed and blended when preparing a solution containing components (b1) and (b2), or blended and blended with component (b3). When the O / W type microemulsion is to mix any component with the internal phase (oily phase), when preparing a solution containing the components (b1) and (b2), as long as the components (b1) and (b2), And any ingredients. In order to mix an arbitrary component with an external phase (aqueous phase), it is sufficient to mix the arbitrary component with the water of the component (b3).

In the case of W / O microemulsions, components (b1) and (b3) are usually used as components belonging to the internal phase (aqueous phase), and component (b2) is used as components belonging to the external phase (oily phase) It can be modulated by the above method.

    <Solid soap composition>    

The solid soap composition of the present invention is a solid soap composition containing (A) a soap base and (B) a microemulsion. The microemulsion may be used singly or in combination of two or more kinds. The solid soap composition of the present invention contains (A) a soap base and (B) a microemulsion, and the microemulsion is preferably uniformly dispersed in the solid soap composition.

The solid soap composition of the present invention can be applied to any one of mechanical soap (mechanical soap composition) and framed soap (framed soap composition).

The blending amount (blending ratio) of the (A) soap base in the solid soap composition is usually 20 to 99% by mass, preferably 20 to 95% by mass, more preferably 22 to 90% by mass, and even more preferably It is 25 to 88% by mass.

As a form, for example, in the case of mechanical soap, the blending amount of the soap base in the solid soap composition is preferably 50 to 99% by mass, more preferably 60 to 95% by mass, and even more preferably 65 to 90% by mass. %, Especially good for 70 ~ 88 mass%. From the viewpoint of improving foamability, (A) the greater the blending amount of the soap base, the better, but the more soap base, the stronger the detergency of washing away sebum, etc., which may cause a burden on the skin or wash After that, the skin has a tightness problem. (A) If the blending amount of the soap base is within the above range, the foamability of the solid soap composition will be good, and if necessary, ingredients with a moisturizing effect will be blended with the solid soap composition. Therefore, it is possible to further improve the feeling of use and the like after washing and the like. As a form, in the case of framed soap, the blending amount of the soap base in the solid soap composition is preferably 20 to 70% by mass, more preferably 20 to 65% by mass, and even more preferably 20 to 60% by mass. %, More preferably 22 to 50% by mass, and particularly preferably 25 to 45% by mass.

(B) The blending amount of the microemulsion is from the viewpoint of good foam quality of the solid soap composition. For example, it is preferably 0.15% by mass or more, more preferably 0.2% by mass or more by 0.25% by mass in the solid soap composition. Still more preferably, it is 0.3 mass% or more. The blending amount of the microemulsion is, for example, preferably 12% by mass or less, more preferably 10% by mass or less, still more preferably 5% by mass or less, still more preferably 4% by mass or less in the solid soap composition or 3% by mass or less. These lower and upper limits can be arbitrarily combined.

In one aspect, the blending amount of (B) the microemulsion is preferably 0.15-12% by mass, and more preferably 0.15-10% by mass in the solid soap composition. If the blending amount of the microemulsion is within the above range, the foam quality of the solid soap composition is good and preferred. In addition, when producing a solid soap composition, the moldability is good, and any of a mechanical method and a frame method can be used, which is preferable. In one aspect, the upper limit of the blending amount of the microemulsion is also preferably 5% by mass or less in the solid soap composition. When the blending amount of the microemulsion is 5% by mass or less, the moldability when producing a solid soap composition is better. The blending amount of the microemulsion is more preferably 0.15 to 5% by mass in the solid soap composition. If the blending amount of the microemulsion is within the above-mentioned range, the foam of the solid soap composition will be good, and a foam having elasticity and stringability will be formed. In addition, the foam has good durability. Moreover, the moldability at the time of manufacture of a solid soap composition is also favorable. In one form, the blending amount of the microemulsion in the solid soap composition is more preferably 0.15 to 4% by mass, and particularly preferably 0.2 to 3% by mass. In addition, as a form, the blending amount of the microemulsion is preferably 0.2 to 5% by mass, more preferably 0.25 to 4% by mass, and even more preferably 0.25 to 3% by mass. When two or more kinds of microemulsions are used, the blending amount of the microemulsions is their total.

The blending ratio of (A) soap base and (B) microemulsion in the solid soap composition is preferably 1/2000 or more, 1/1500 or more, or 1/1000 or more in terms of mass ratio. It is more preferably 1/600 or more, 1/500 or more, or 1/400 or more, even more preferably 1/350 or more, and particularly preferably 1/300 or more. The mass ratio (B) / (A) is preferably 1/15 or less, more preferably 1/18 or less, 1/20 or less, or 1/25 or less, and still more preferably 1/50 or less. It is 1/60 or less. These lower and upper limits can be arbitrarily combined.

As an example, the blending ratio of (A) the soap base and (B) the microemulsion in the solid soap composition is preferably 1/2000 to 1/15 by mass ratio (B) / (A), and more preferably 1/1500 ~ 1/15, more preferably 1/1000 ~ 1/15, more preferably 1/1000 ~ 1/18, even more preferably 1/1000 ~ 1/20, even more preferably 1/1000 ~ 1/50, especially preferred are 1/600 ~ 1/60, 1/500 ~ 1/60, 1/400 ~ 1/60, 1/350 ~ 1/60 or 1/300 ~ 1/60. Moreover, in one aspect, the blending ratio of (A) the soap base and (B) the microemulsion in the solid soap composition is preferably 1/600 to 1/15 in terms of mass ratio (B) / (A). It is preferably 1/500 ~ 1/15, more preferably 1/400 ~ 1/20, even more preferably 1/350 ~ 1/25, and particularly preferably 1/300 ~ 1/25.

If the blending ratio of the soap base and microemulsion in the solid soap composition is within the above range, the foam quality will be better, and elastic and silky foam will be formed. In addition, the foam has good durability and is preferred.

As an example of a preferable aspect in the present invention, for example, it contains a compound selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid (more preferably, lauric acid, myristic acid, and palmitic acid). The solid salt composition of at least one saturated fatty acid alkali group as the (A) soap base, and containing the following O / W type microemulsions and / or W / O type microemulsions as the (B) microemulsion: The nonionic surfactant in (b1) is a nonionic surfactant with an HLB of 10 to 20, and the nonionic surfactant with an HLB of 10 to 20 is selected from the group consisting of polyoxyethylene alkyl ether and polyoxyethylene polyoxyl. Acryl alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl fatty acid ester, polyoxyethylene hydrogenated castor oil, polyglyceryl fatty acid ester, and polyether modified polysiloxane (more preferably polysiloxane) Oxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl fatty acid ester, and polyoxyethylene hydrogenated castor oil), and the anionic surfactant is selected from the group consisting of polyoxyethylene Vinyl alkyl ether phosphate, N-fluorenyl glutamate, and polyoxyethylene alkyl ether phosphoric acid or O / W type microemulsion of at least one of the group, more preferably at least one of polyoxyethylene alkyl ether phosphoric acid and its salt; the nonionic surfactant in (b1) is HLB of 1 to 7 Non-ionic surfactant, the non-ionic surfactant with HLB of 1 to 7 is selected from polyoxyethylene difatty acid ester, monoglycerol monofatty acid ester, monoglycerol difatty acid ester, diglycerol monofatty acid ester At least one of the groups formed by polyether modified polysiloxane and more preferably polyether modified polysiloxane W / O microemulsion.

The solid soap composition may further contain components (hereinafter also referred to as other components) other than (A) a soap base and (B) a microemulsion, as long as the effects of the present invention are not impaired. It can be blended with, for example, one or two or more humectants (wetting agents), softeners, bactericides, chelating agents, surfactants (emulsifiers), inorganic salts, stabilizers (antioxidants, ultraviolet absorbers), Plant extracts, flavors, colorants (pigments, etc.), water, etc. can be used as ingredients in solid soaps.

Examples of the humectant include hyaluronic acid, collagen, and polyhydric alcohol. Examples of the polyhydric alcohol include glycerol, propylene glycol, 1,3-butanediol, sorbitol, sucrose, and trehalose. When a polyhydric alcohol is blended into the solid soap composition, the blending amount is preferably 0.01 to 2% by mass, and more preferably 0.1 to 1% by mass, if it is a mechanical soap. When the polyol is blended into the framed soap, the blending amount is preferably 20 to 40% by mass, and more preferably 25 to 35% by mass in the solid soap composition.

Examples of the softening agent include an oily component used as the component (b2) described above. Examples of the fungicide include trichlorosymmetric diphenylurea, triclosan, isopropylmethylphenol, and the like.

Examples of the chelating agent include pentetic acid pentasodium salt (pentanic acid 5Na), hydroxyethane diphosphonic acid tetrasodium salt (hydroxyethane diphosphonic acid 4Na), ethylenediamine tetraacetic acid, or Its salt, citric acid or its salt and the like. Examples of the salt include a sodium salt and a potassium salt.

Examples of the surfactant include the above-mentioned anionic surfactant, nonionic surfactant, and cationic surfactant. For example, examples of the anionic surfactant include alkyl ether sulfate, polyoxyethylene alkyl ether sulfate (lauryl polyoxyethyl sulfate, sodium lauryl sulfate), and the like. In addition, the components of the fatty acid alkali salt and the microemulsion used as the soap base are not included in the surfactant used as other ingredients in the solid soap composition.

Examples of the inorganic salt include sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate.

Examples of the antioxidant include tocopherol (vitamin E), ascorbic acid (vitamin C), and the like. Examples of the plant extract include tea leaf extract and oolong tea extract. In addition, the solid soap composition may also contain fatty acids with 8 to 22 carbons (preferably fatty acids with 12 to 18 carbons, such as stearic acid, lauric acid, and myristic acid), and monohydric alcohols (such as ethanol, propanol, Butanol) as other ingredients.

When the solid soap composition contains water, the blending amount thereof is preferably 1 to 30% by mass in the solid soap composition. The water at this time is water contained as another component. In the case of mechanical soap, the blending amount of water is preferably 1 to 20% by mass, and more preferably 1 to 10% by mass in the solid soap composition. In the case of framed soap, the blending amount of water in the solid soap composition is preferably 10 to 30% by mass, and more preferably 15 to 30% by mass. As the water, tap water, ion-exchanged water, distilled water, and the like described above can be used.

Other components can be used individually or in combination of 2 or more types. In addition, the examples of other components are mentioned above, but these may be blended for purposes other than the above depending on their action or properties. For example, a substance exemplified as a chelating agent may be blended as a bactericide or may be blended as a stabilizer.

The solid soap composition of the present invention can be prepared using a soap base composition containing the above-mentioned soap base and microemulsion, and other ingredients blended as required. The soap base composition can be obtained by kneading the ingredients.

The form of the solid soap composition of the present invention is not particularly limited. For example, it is preferably solid, flake, powder or granular.

The solid soap composition of the present invention can be used for, for example, washing of the skin of the face and body, and washing of hair. For example, it is suitable for skin washing, and it is especially suitable as a makeup remover composition.

    <Manufacturing method of solid soap composition>    

The solid soap composition of the present invention can be prepared by a step of preparing a soap base composition by kneading at least (A) a soap base and (B) a microemulsion containing the following components (b1) to (b3). To make

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

A method for producing a solid soap composition including the steps described above also belongs to the present invention. The method for producing the solid soap composition of the present invention (hereinafter also simply referred to as the method for producing the present invention) is preferably used as the method for producing the solid soap composition of the present invention described above.

The manufacturing method of the present invention may include a step other than the step of preparing a soap base composition, and for example, may include a step of preparing a microemulsion.

The soap base and microemulsion in the manufacturing method of the present invention and these preferred forms are the same as those in the solid soap composition of the present invention described above. The fatty acid alkali salt and microemulsion used as a soap base may be used individually by 1 type, and may use 2 or more types together. In the preparation of the soap base composition, at least (A) the soap base and (B) the microemulsion may be kneaded. In addition to these ingredients (A) and (B), other ingredients may be blended as required. The blending amount of each component, such as a soap base and microemulsion, is preferably appropriately set so that the blending amount of each component used in the soap base composition is within the above range. For example, the blending amount of microemulsion is preferably 0.15 to 12% by mass, more preferably 0.15 to 10% by mass, even more preferably 0.15 to 5% by mass, and particularly preferably 0.15 to 4 in the solid soap composition. Mass%, particularly good 0.2 ~ 3 mass%. In one aspect, the blending amount of the microemulsion in the solid soap composition is preferably 0.2 to 5% by mass, more preferably 0.25 to 4% by mass, and even more preferably 0.25 to 3% by mass.

The blending amount of the microemulsion when manufacturing such a solid soap composition is, for example, preferably 0.15 to 12% by mass, more preferably 0.15 to 10% by mass, and even more preferably 0.15 in the soap base composition. ~ 5% by mass, 0.15 ~ 4% by mass, and 0.2 ~ 3% by mass. In one aspect, the blending amount of the microemulsion in the soap base composition is preferably 0.2 to 5% by mass, more preferably 0.25 to 4% by mass, and even more preferably 0.25 to 3% by mass.

It is also preferable to appropriately set the blending ratio of (A) the soap base and the microemulsion so that the mass ratio of (B) / (A) in the obtained solid soap composition falls within the above range.

In the step of preparing the soap base composition, the soap base and the microemulsion, and other ingredients blended as required may be kneaded. The kneading is preferably performed until the ingredients are uniform. The order of kneading these ingredients is also not particularly limited. The kneading method is not particularly limited, as long as the kneading is performed by stirring with a mixer or the like. In addition, raw materials such as a soap base and microemulsion can be added all at once or divided into multiple additions. For example, you can knead the soap base, microemulsion, and other ingredients blended as required; you can knead the soap base and other ingredients, and then add microemulsion to knead them; you can knead some of the other ingredients and the soap base, and then add the rest Knead other ingredients and microemulsion; you can also knead soap base and microemulsion, add other ingredients and knead. When mixing, you can also heat as needed.

A solid soap composition can be obtained by applying a general method such as a frame method, a mechanical method, etc. to the soap base composition obtained through the above steps.

For example, when using a mechanical method, the soap base composition can be directly made into a solid soap composition. For example, when a solid soap composition is to be made, it can be processed into a solid soap shape by cutting or die forging the soap base composition. It is also preferable to pulverize the soap base composition and further knead it to make it uniform. At this time, after extruding into a rod shape or the like with an extruder, it can be cut into a desired size or subjected to die forging to obtain a solid soap composition.

In the frame-making method, a soap base composition can be poured into a frame and allowed to solidify, and then a solid soap composition (framed soap composition) can be produced by cutting to a desired size. It can also be cooled as required during curing. It can also be further dried before or after cutting, or die forged after cutting.

When the solid soap composition is to be powdered, it may be powdered by cutting the solid soap composition or the like.

    <Foam improver for solid soap composition>    

The foam improver of the solid soap composition of the present invention uses microemulsions containing the following components (b1) to (b3) as effective ingredients:

(b1) at least one surfactant selected from the group consisting of a nonionic surfactant and an anionic surfactant

(b2) at least one oily component

(b3) water.

By blending the foam modifier of the solid soap composition of the present invention (hereinafter also simply referred to as foam modifier) to the solid soap composition, the foam quality of the solid soap composition can be improved. In addition, the foam durability of the solid soap composition can be improved. Therefore, by blending the foam improver of the present invention with a solid soap composition, a solid soap composition having good foam quality and foam durability can be obtained. The foam improver of the solid soap of the present invention is suitable for a solid soap composition prepared using a soap base. The foam quality improving agent may also be referred to as a foam quality improving agent.

The foam improving agent of this invention contains the said microemulsion.

The microemulsion and its preferred form in the foam improver of the present invention are the same as the microemulsion and its preferred form used in the solid soap composition described above.

The content of the microemulsion in the foam improver may be 100% by mass, but as long as the effect of the present invention is not impaired, other components may be contained as required.

In one aspect, when the foam quality of the solid soap composition is to be improved by the foam quality modifier of the present invention, the foam quality modifier may be added to the soap base during the production of the solid soap composition. As for the blending amount of the foam modifier, the foam modifier is preferably blended in such a manner that the microemulsion in the solid soap composition contains the amount described for the solid soap composition of the present invention described above. As an example, it is preferable to mix the foam improver so that the solid soap composition becomes 0.15 to 12% by mass in terms of microemulsion. As an example, the blending amount of the foam modifier in the solid soap composition is more preferably 0.15 to 10% by mass, more preferably 0.15 to 5% by mass, and even more preferably 0.15 to 4% by mass. Particularly preferred is 0.2 to 3% by mass. In one form, the blending amount of the foaming improver based on the blending amount of the microemulsion is also preferably 0.2 to 5% by mass, 0.25 to 4% by mass, or 0.25 to 3% by mass in the solid soap composition. Wait.

In the production of a solid soap composition, a method for improving the foam quality of a solid soap composition in which the above-mentioned microemulsion is added to a soap base is also included in the present invention. In the production of a solid soap composition, the soap base and the microemulsion are preferably kneaded. The soap base is not particularly limited, and the above may be used. By using microemulsion, the foam quality and foam durability of solid soap compositions can be improved.

The foam improving agent of the present invention can be used without being incorporated into a solid soap composition. When a solid soap composition is used, for example, when a foam modifier is added to a diluent of the composition and foamed, the foam quality and foam durability can be improved. The amount of the foam modifier used at this time is preferably, for example, relative to the total amount of the solid soap composition and the foam modifier, the microemulsion is preferably 0.15 to 12% by mass, more preferably 0.15 to 10% by mass, and even more It is preferably 0.15 to 5 mass%, particularly preferably 0.15 to 4 mass% or 0.2 to 3 mass%. In one form, the amount of the foam modifier is preferably 0.2 to 5% by mass, 0.25 to 4% by mass, or 0.25 to 3 relative to the total amount of the solid soap composition and the foam modifier. quality%.

The present invention also includes the use of a microemulsion containing the above-mentioned components (b1) to (b3) as a foam improver for producing a solid soap composition. The present invention also includes the use of a microemulsion containing the above-mentioned ingredients (b1) to (b3) to improve the foam quality of a solid soap composition. The preferred form of the microemulsion and the method of using it are the same as those described above.

    [Example]    

Examples of the present invention will be described more specifically below. In addition, the present invention is not limited to these examples. In the examples, if not specifically described before,% and parts mean mass% and mass parts, respectively.

The surfactants and oily ingredients used below are as follows:

    (Surfactant)    

Monooleic acid polyoxyethylene sorbitan (20E.O.): Trade name Nonion OT-221, manufactured by Nippon Oil & Gas Co., Ltd., indicates Polysorbate 80, HLB15.7

Polyoxyethylene glyceryl isostearate: trade name EMALEX GWIS-120, manufactured by NIHON EMULSION (stock), and its name is PEG-20 Glyceryl Isostearate, HLB13

Di POE (8) (C12-15) alkyl ether phosphoric acid: trade name NIKKOL DDP-8, manufactured by Nikko Chemicals (shares), indicating the name Di (C12-15) pareth-8 phosphate, HLB11.5

Polyoxyethylene cholesteryl ether: trade name EMALEX CS-10, manufactured by NIHON EMULSION (stock), indicating names Choleth 10, HLB10

Polyoxyethylene (60) hydrogenated castor oil: trade name NIKKOL HCO-60, manufactured by Nikko Chemicals (stock), indicating the name PEG60 hydrogenated castor oil, HLB14.0

Cetyl PEG / PPG10-1 dimethicone: trade name ABIL EM 90, manufactured by Evonik, HLB3.5

Polyoxyethylene polyoxypropylene polymer: trade name NIKKOL PEN-4630, made by Nikko Chemicals (stock), the name PPG-6 Decyltetradeceth-30 (polyoxyethylene polyoxypropylene decyl tetradecyl ether), HLB12.0

Decaglyceryl monostearate: trade name NIKKOL Decaglyn 1-SV, manufactured by Nikko Chemicals (stock), indicating the name Polyglyceryl-10 stearate, HLB12.0

Polyoxyethylene ‧ methyl polysiloxane copolymer: trade name DOW CORNING TORAY SS-2804, manufactured by TORAY (stock), indicating the name PEG-12 Dimethicone, HLB13

    (Oily ingredients)    

Argan oil: Trade name Lipofructyl (registered trademark) Argan LS 9779, manufactured by BASF, the name ARGANIA SPINOSA KERNEL OIL

Hexadecyl ethylhexanoate: trade name NS-CIO, made by Nippon Seika Co., Ltd.

Olive oil: trade name NIKKOL Olive Oil, made by Nikko Chemicals

Jojoba Oil: Trade name NIKKOL Jojoba Oil S, manufactured by Nikko Chemicals (stock), and the name Simmondsia Chinensis (Jojoba) Seed Oil

    (Other)    

Propylene glycol (1,3-propanediol): trade name Zemea (registered trademark) Select propanediol, manufactured by DuPont Tate & Lyle Bio Products

Butanediol: 1,3-butanediol

Citrus extract: Trade name Mandarin Clear, manufactured by ICHIMARU PHARCOS (stock), and expressed as MANDARIN ORANGE PEEL EXTRACT (ingredients: pure water, 1,3-butanediol, aged peel extract)

The water used in the manufacture of microemulsion is ion-exchanged water.

The evaluation of the rapid foamability, foamability, and drainage time of the solid soap composition was performed using the solid soap composition as a soap sample in the following manner.

The rapid foamability refers to the rapidity of foamability. Foaming refers to the amount of foam. Drainage time indicates the persistence of foam (emulsion-like cotton density). The longer the drainage time, the better the foam persistence.

    (Assessment method)    

1) Add 300 mL of ion-exchanged water or tap water (water temperature: 25 ° C.) to a juice machine (trade name Juice Mixer, model JM-N-88, model JIK, manufactured by NAKASA (Stock)). In addition, in the same test system (for example, when the solid soap composition of Comparative Example 1 and Comparative Example 1), the same water (ion exchange water or tap water) was used for evaluation.

2) Regarding 1), put a finely powdered soap sample into a sample.

3) The juicer is rotated, and the height of the foam is measured after 10 seconds as the rapid foaming property.

4) The rotation was stopped after 60 seconds, and the height of the foam was measured as the foamability.

5) The time required to reduce the amount of foam (volume) in the juice machine to 200 mL after 60 seconds is taken as the drainage time (foam persistence).

In the following, the data shown in the examples are average numbers of actual measured values of n = 3 (three times).

    <Example 1>    

An O / W type microemulsion (O / W1-1) containing the components shown in Table 1 was prepared according to the following method.

(1) The components of the internal phase are weighed, mixed, and stirred while heating to 60 ° C to obtain a uniform solution.

(2) The components of the external phase are weighed and mixed in a container different from the above (1).

(3) While fully stirring the mixed solution obtained in (2) with a spatula, slowly add the solution obtained in (1).

(4) After the addition is completed, stir for about 0.5 minutes to obtain a transparent microemulsion that is visually single-phase.

The O / W type microemulsion containing the components shown in Tables 2 to 3 was prepared in the same manner as above except that the internal phase and the external phase used the components shown in Tables 2 to 3 O / W1-2 to O / W1- 3.

A composition containing the following composition of the soap base (hereinafter referred to as the composition (I)) and microemulsions O / W1-1 to O / W1-3 were kneaded at room temperature until the shape became uniform to obtain a soap base composition. This soap base composition was die forged by a die forging machine to obtain a solid soap composition. This solid soap composition is a mechanical soap.

The composition (I) used in the following examples and comparative examples is a composition of the following composition (soap base described below) including a soap base (fatty acid alkali salt) and other ingredients (apart from soap base and microemulsion) The content (%) of the other components is the content (%) in the composition (I)). Composition (I) contained 86.5% of a soap base.

Composition of composition (I) (Soap base)

Myristic acid Na: 32.7%

Myristic acid K: 21.8%

Lauric acid Na: 14.0%

Lauric acid K: 9.3%

Na Palmitate: 5.2%

Palmitic acid K: 3.5%

(Other ingredients)

Water: 9.997%

Lauric acid 2.5%

Glycerin: 0.7%

The blending amount (%) of microemulsion (ME) is (1) 0.05%, (2) 0.15%, (3) 0.20%, (4) 0.25%, or (5) 0.30% in the solid soap composition. . The blending amount of this microemulsion is the total of microemulsion O / W1-1 to O / W1-3 (each microemulsion is used in the same amount). For example, when the blending amount of the microemulsion (2) is 0.15%, 99.85 parts of the composition (I) and 0.05 parts (0.15 parts in total) of the microemulsion O / W1-1 to O / W1- are used. 3 to prepare the soap base composition.

The blending amounts of the microemulsion (ME) and the soap base in the solid soap composition (1) to (5) prepared in Example 1 are shown below. will The mass ratio of ME / soap base is shown in parentheses.

(1) ME0.05% and soap base 86.46% (ME / soap base = 1/1729)

(2) ME0.15% and soap base 86.37% (ME / soap base = 1/576)

(3) ME0.20% and soap base 86.33% (ME / soap base = 1/432)

(4) ME 0.25% and soap base 86.28% (ME / soap base = 1/345)

(5) ME 0.30% and soap base 86.24% (ME / soap base = 1/287)

<Comparative example 1>

A solid soap composition was obtained in the same manner except that microemulsion was not used in Example 1. The solid soap composition of this Comparative Example 1 is a solid soap composition prepared from the composition (I).

0.5 g of each solid soap composition prepared in Example 1 and Comparative Example 1 was used as a soap sample, and the drainage time was evaluated by the method described above (soap sample concentration in the sample: 0.5 g / 300 mL). The results are shown in Table 4. Drainage time increase rate (%) is the drainage time (T1) (seconds) of the solid soap composition with microemulsion compared to the solid soap composition of Comparative Example 1 (solid soap composition without microemulsion) The increase rate of the drainage time (T0) (seconds) is obtained by the following calculation.

Drainage time increase rate (%) = 100 × (T1-T0) / T0

Comparative Example 1 was a case where the ME blending amount was 0%. When a microemulsion is blended with a solid soap composition, the drainage time will increase. In particular, when a microemulsion of 0.15% by mass or more is added to the solid soap composition, the drainage time is significantly increased.

    <Example 2>    

An O / W type microemulsion (O / W2-1) containing each component shown in Table 5 was prepared in the same manner as in Example 1 except that the components shown in Table 5 were used for the internal phase and the external phase.

A W / O type microemulsion (W / O2-1) containing each component shown in Table 6 was prepared in the same manner as above except that the components shown in Table 6 were used for the internal phase and the external phase.

Composition (I) (75.6 parts), microemulsion O / W2-1 (0.15 parts), microemulsion W / O2-1 (0.15 parts), and other added ingredients (emulsifier, softener, wetting agent) Agents, stabilizers, perfumes, coloring materials, etc. (24.1 parts in total) are kneaded at room temperature until the shape becomes uniform to obtain a soap base composition. This soap base composition was die forged by a die forging machine to obtain a solid soap composition. The amount of the microemulsion in the solid soap composition was 0.3%, and the amount of the soap base was 65.4% (the mass ratio of ME / soap base was 1/218).

In addition, the other additive components used in the examples and comparative examples did not contain a soap base and a microemulsion.

Using the above-mentioned evaluation method, the rapid foaming property, foaming property, and drainage time were evaluated for each solid soap composition prepared in Example 2 and Comparative Example 1. As the soap sample, 1 g of each solid soap composition was used (soap sample concentration in the sample: 1 g / 300 mL). The results are shown in Table 7. The solid soap composition of Example 2 doped with microemulsion had a longer draining time than the solid soap composition of Comparative Example 1, and was superior in foam durability. Moreover, the solid soap composition of Example 2 was excellent in rapid foaming property and foaming property.

    <Example 3>    

Except that the internal and external phases use the components shown in Tables 8 to 10, three types of O / W type microemulsions (O / W3-1) containing the components shown in Tables 8 to 10 were prepared in the same manner as in Example 1. ~ O / W3-3). In addition to using 0.1 parts (a total of 0.3 parts) of these microemulsions O / W3-1 ~ O / W3-3 respectively instead of microemulsions O / W2-1 (0.15 parts) and microemulsions W / O2-1 (0.15 parts Except for), a solid soap composition was obtained in the same manner as in Example 2. The amount of the microemulsion in the solid soap composition was 0.3%, and the amount of the soap base was 65.4% (the mass ratio of ME / soap base was 1/218).

Using the above-mentioned evaluation method, the rapid foaming property, foaming property, and drainage time were evaluated for each solid soap composition prepared in Example 3 and Comparative Example 1. As the soap sample, 1 g of each solid soap composition was used (soap sample concentration in the sample: 1 g / 300 mL). The results are shown in Table 11.

    <Example 4>    

Three types of O / W type microemulsions (microemulsions O / W1-1 to O / W1-3 containing the components shown in Tables 1 to 3) were prepared in the same manner as in Example 1. For the manufacture of a soap-free base composition, use composition (I) (86.0 parts), 0.1 parts each (0.3 parts in total) of microemulsion O / W1-1 to O / W1-3, and other added ingredients (emulsifier, softener) A solid soap composition was obtained in the same manner as in Example 1 except that the total amount of the additives was 13.7 parts). The blending amount of the microemulsion in the solid soap composition was 0.3% in the solid soap composition, and the blending amount of the soap base was 74.4% (the mass ratio of the ME / soap base was 1/248).

    <Comparative example 2>    

Except that the components (raw materials) of the microemulsions O / W1-1 to O / W1-3 shown in Tables 1 to 3 were not microemulsified, 0.1 parts (0.3 parts in total) were used for the composition (I) (86.0 A solid soap composition was obtained in the same manner as in Example 4 except that the total amount was 13.7 parts (emulsifier, softener, wetting agent, stabilizer, flavor, colorant, etc.) and other added components.

Using the evaluation methods described above, the rapid foaming properties, foaming properties, and drainage time were evaluated for each solid soap composition prepared in Example 4 and Comparative Example 1. As the soap sample, 1 g of each solid soap composition was used (concentration in the sample: 1 g / 300 mL). The results are shown in Table 12.

The solid soap composition of Example 4 doped with microemulsion has quick foaming and foaming properties compared to the solid soap composition of Comparative Example 2 which is directly blended without mixing the components contained in the microemulsion with microemulsion. The foam and the durability of the foam are both excellent.

    <Example 5>    

Except for using the components shown in Tables 13 to 15 for the internal and external phases, three types of O / W microemulsions (O / W5-1) containing the components shown in Tables 13 to 15 were prepared in the same manner as in Example 1. ~ O / W5-3). A solid soap composition was obtained in the same manner as in Example 1 except that the composition (I) (99.7 parts) and each 0.1 parts (a total of 0.3 parts) of microemulsion O / W5-1 to O / W5-3 were used. . The amount of the microemulsion in the solid soap composition was 0.3%, and the amount of the soap base was 86.2% (the mass ratio of ME / soap base was 1/287).

Using the above-mentioned evaluation methods, the rapid foaming property, foaming property, and drainage time were evaluated for each solid soap composition prepared in Example 5 and Comparative Example 1. As the soap sample, 1 g of each solid soap composition was used (soap sample concentration in the sample: 1 g / 300 mL). The results are shown in Table 16.

    <Example 6>    

In the same manner as in Example 1, three types of O / W type microemulsions O / W1-1 to O / W1-3 containing the components shown in Tables 1 to 3 were prepared. A soap base composition was prepared using the following composition (II) containing the soap base and these microemulsions.

The composition (II) (99.7 parts) and microemulsion O / W1-1 to O / W1-3 (0.1 parts each, 0.3 parts in total) were kneaded at room temperature until the shape became uniform to obtain a soap base composition. The soap base composition was poured into a 100 mL plastic mold and cooled at room temperature. After solidification, the solid soap composition was removed from the mold. The amount of the microemulsion in the solid soap composition was 0.3%, and the amount of the soap base was 25.8% (the mass ratio of ME / soap base was 1/86). This solid soap composition is a framed soap.

The composition (II) is a composition of the following composition including a soap base and other ingredients (the content (%) of the soap base and other ingredients described below is the content (%) in the composition (II)). Composition (II) contained 25.9% of a soap base.

    Composition of composition (II)         (Soap base)    

Na stearate: 16.0%

Lauric acid Na: 8.0%

Myristic acid Na: 1.9%

    (Other ingredients)    

Water: 29.9%

Glycerin: 14.0%

Propylene glycol (PG): 14.0%

Sorbitol: 6.0%

Lauryl polyoxyether sulfate Na: 6.0%

Lauryl sulfate Na: 2.4%

Na chloride: 0.6%

Stearic acid: 0.6%

Lauric acid: 0.2%

Myristic acid: 0.2%

Pentetic acid 5Na: 0.1%

Hydroxyethane diphosphonic acid 4Na: 0.1%

    <Comparative example 3>    

A solid soap composition was obtained in the same manner except that microemulsion was not used in Example 6. The solid soap composition of Comparative Example 3 is a solid soap composition prepared from the composition (II).

Using 1.0 g of each solid soap composition prepared in Example 6 and Comparative Example 3 as a soap sample, the drainage time was evaluated in the same manner as in Example 1 (soap sample concentration in the sample: 1.0 g / 300 mL) . The results are shown in Table 17. The drainage time increase rate (%) is the drainage time (T1) (seconds) of Example 6 (a solid soap composition with microemulsion) compared to Comparative Example 3 (a solid soap composition without microemulsion) The increase rate of the drainage time (T0) (second) was calculated in the same manner as in Example 1.

In Table 17, Comparative Example 3 was the case where the ME content was 0%. The ME blending amount was 0.3% as Example 6. By blending microemulsion, the foam consistency is improved.

    <Test Example 1>    

In the same manner as in Example 1, three types of O / W type microemulsions O / W1-1 to O / W1-3 containing the components shown in Tables 1 to 3 were prepared.

The composition (I) was subjected to die forging by a die forging machine to obtain a solid soap base composition.

The following evaluation methods were used to evaluate the rapid foaming and drainage time.

1) A juice machine (trade name Juice Mixer, model JM-N-88, model JIK, manufactured by NAKASA (stock)) was charged with 100 mL of tap water (tap water temperature: 25 ° C).

2) Pair 1) Prepare the sample by adding the finely powdered solid soap base composition and microemulsion.

3) The juicer is rotated, and the height of the foam is measured after 10 seconds as the rapid foaming property.

4) Stop rotation after 60 seconds, and measure the height of the foam.

5) The time required to reduce the amount of foam (volume) in the juice machine to 200 mL after 60 seconds is taken as the drainage time (foam persistence).

The data of rapid foaming and drainage time are represented by the average number of measured values of n = 3 (three times).

The solid soap base composition and microemulsion (ME) were used in the following amounts (1) to (4).

(1) Solid soap base composition 0.5g, (2) Solid soap base composition 0.4985g and ME0.0015g, (3) Solid soap base composition 0.485g and ME0.015g, (4) Solid soap base composition 0.475 g and ME0.025g

The amount of ME used is (1) 0%, (2) 0.3%, (3) 3.0%, and (4) 5.0% with respect to the total mass of the solid soap base composition and the ME. The microemulsions O / W1-1 to O / W1-3 are used in equal amounts, so that the total amount becomes the above amount. For example, in (2), the amounts of the microemulsions O / W1-1 to O / W1-3 are 0.0005 g, respectively.

Relative to the total mass of solid soap base composition and ME, the amount of soap base used was (1) 86.5%, (2) 86.2%, (3) 83.9%, and (4) 82.2%.

The mass ratio of the amount of soap base and microemulsion (ME / soap base) is (1) 0, (2) 1/287, (3) 1/28, and (4) 1/16.

The results are shown in Table 18.

The drainage time increase rate (%) is the drainage time (T1) (seconds) when the microemulsion is mixed with the drainage time (T0) of the above (1) sample (the sample without the ME). The rate of increase in seconds) was calculated in the same manner as in Example 6. With the microemulsion, it is known that the sudsing of the solid soap composition is improved.

    <Manufacturing Example 1>    

In the same manner as in Example 1, three types of O / W type microemulsions O / W1-1 to O / W1-3 containing the components shown in Tables 1 to 3 were prepared.

The composition (I) (88 parts) and microemulsion O / W1-1 to O / W1-3 (4 parts each, 12 parts in total) were kneaded at room temperature until the shape became uniform to obtain a soap base composition. This soap base composition was subjected to die forging by a die forging machine to obtain a mechanical solid soap composition. The amount of the microemulsion in the solid soap composition was 12%, and the amount of the soap base was 76% (the mass ratio of ME / soap base was 1/6).

    <Manufacturing Example 2>    

A solid was produced in the same manner as in Production Example 1 except that 97 parts of the composition (I) and 1 part (total 3 parts) of microemulsion O / W1-1 to O / W1-3 were used. Soap composition. The blending amount of the microemulsion in the solid soap composition was 3%, and the blending amount of the soap base was 84% (the mass ratio of ME / soap base was 1/28).

    [Industrial availability]    

According to the present invention, it is possible to provide a solid soap composition having good foam quality and foam durability and excellent use feeling.

Claims (11)

A solid soap composition for skin washing or hair washing, which comprises (A) a soap base and (B) a microemulsion containing the following ingredients (b1) to (b3): (b1) selected from non-ionic At least one type of surfactant (b2), at least one type of oily component (b3), which is a group of a surfactant and an anionic surfactant. The solid soap composition according to claim 1, wherein the blending amount of the (B) microemulsion is 0.15 to 5% by mass in the solid soap composition. The solid soap composition according to claim 1 or 2, wherein the (B) microemulsion system further comprises (b4) a monohydric alcohol having 1 to 4 carbon atoms and / or (b5) a polyhydric alcohol. The solid soap composition according to claim 1 or 2, wherein the solid soap composition is in the form of a solid, a sheet, a powder or a granule. For example, the solid soap composition of claim 1 or 2, wherein the microemulsion is an oil-in-water (O / W type) microemulsion, and the non-ionic surfactant is a polyoxyethylene alkyl ether selected from HLB of 10-20. , Polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl fatty acid ester, polyoxyethylene hydrogenated castor oil, polyglyceryl fatty acid ester, and polyether modified polysilicon At least one of the groups formed by oxygen. The solid soap composition of claim 1 or 2, wherein the aforementioned microemulsion The gum is an oil-in-water (O / W type) microemulsion, and the aforementioned anionic surfactant is selected from the group consisting of polyoxyethylene alkyl ether phosphate, N-fluorenyl glutamate, and polyoxyethylene alkyl ether phosphate or At least one species of its salt. For example, the solid soap composition of claim 1 or 2, wherein the aforementioned microemulsion is an oil-in-water (W / O type) microemulsion, and the aforementioned nonionic surfactant is a polyoxyethylene difat selected from HLB of 1 to 7 Esters, monoglycerol monofatty acid esters, monoglycerol difatty acid esters, diglycerol monofatty acid esters, and polyether modified polysiloxanes. A method for producing a solid soap composition for skin washing or hair washing, comprising at least (A) a soap base and (B) a microemulsion containing the following components (b1) to (b3) and kneading A step of preparing a soap base composition; (b1) at least one surfactant (b2) selected from the group consisting of a nonionic surfactant and an anionic surfactant, and at least one oily component (b3) water. The method for producing a solid soap composition according to claim 8, wherein the blending amount of the (B) microemulsion is 0.15 to 5% by mass in the solid soap composition. A foam soap improver for solid soap composition, which uses microemulsion containing the following components (b1) to (b3) as effective ingredients: (b1) selected from nonionic surfactants and anionic surfactants At least one surfactant in the group, (b2) at least one oily component, and (b3) water. A microemulsion used to improve the foam sustainability of a solid soap composition, wherein the microemulsion contains the following components (b1) to (b3): (b1) is selected from nonionic surfactants and anionic surfactants Groups of at least one surfactant, (b2) at least one oily component, and (b3) water.