JP6817697B2 - Soap-based skin cleanser and storage stability improvement method - Google Patents

Description

The present invention relates to a soap-based skin cleanser and a method for improving storage stability. More specifically, the present invention relates to a soap-based skin cleansing agent that remains transparent in a low-temperature environment and has good foam quality and amount, and a method for improving the storage stability of the soap-based skin cleansing agent in a low-temperature environment.

Conventional liquid cleaning agents generally use potassium soap as a raw material with an emphasis on a refreshing feel after washing. However, such a liquid cleaning agent containing potassium soap as a raw material has a problem that potassium soap and unneutralized fatty acids are precipitated in a temperature environment below the Krafft point, and the appearance becomes cloudy.

In order to solve these problems, conventional soap-based skin cleansers are nonionic surfactants having a chain-saturated alkyl group and betaine-type amphoteric surfactants for the purpose of maintaining transparency at low temperatures. It has been proposed to add an agent, an amine oxide-based surfactant, or the like (see, for example, Patent Documents 1 and 2).

JP-A-2007-326820 JP-A-9-157154

However, the transparency of these transparent soap-based skin cleansers proposed in the prior art in a low temperature environment remains stable at one month (see Patent Documents 1 and 2), and the temperature difference is large in Japan. There was a problem that it was difficult to ensure stability only during this period in the temperature environment of.

As a result of diligent research in view of the above problems, the present inventors have found that ethanol, linear fatty acid alkanolamide type nonionic surfactant (excluding linear fatty acid monoethanolamide type nonionic surfactant), ethanol, We have found that the problems so far can be solved by combining potassium soap and water having a specific fatty acid composition, and have completed the present invention.

That is, the present invention combines ethanol, a linear fatty acid alkanolamide-type nonionic surfactant (excluding the linear fatty acid monoethanolamide-type nonionic surfactant), and potassium soap and water having a specific fatty acid composition. It is a soap-based skin cleanser characterized by this.

Furthermore, the present invention comprises a linear fatty acid alkanolamide type nonionic surfactant (excluding the linear fatty acid monoethanolamide type nonionic surfactant) and ethanol, and soap-based skin composed of a fatty acid and a potassium salt of the fatty acid. It is a method of maintaining the transparency of a soap-based skin cleaning agent in a low temperature environment by blending it with a cleaning agent.

Further, in the above soap-based skin cleansing agent, the fatty acid composition of potassium soap having a specific fatty acid composition is 15 to 45% by mass of lauric acid, 10 to 40% by mass of myristic acid, and 0 to 3 palmitic acid.
It is preferably 5% by mass, containing 15 to 40% by mass of the fatty acid and its potassium salt in total, and the mass ratio of fatty acid: potassium salt is 1:99 to 0: 100. The amount of ethanol compounded is preferably 3 to 10% by mass with respect to the total amount of the soap-based skin cleanser. The amount of the linear fatty acid alkanolamide-type nonionic surfactant (excluding the linear fatty acid monoethanolamide-type nonionic surfactant) is 2 to 5% by mass based on the total amount of the soap-based skin cleanser. It is desirable to have.

According to the present invention, it is possible to provide a soap-based skin cleansing agent that maintains transparency for a long period of time at a low temperature (0 ° C., 3 months) and has good foam quality and amount. It is also possible to provide a method for maintaining the transparency of a soap-based skin cleanser in a low temperature environment.

Hereinafter, the present invention will be described in detail.

The ethanol used in the soap-based skin cleanser of the present invention is alcohol. The blending amount of ethanol is required to be 3 to 10% by mass, preferably 4 to 7% by mass, based on the total amount of the soap-based skin cleanser.

The linear fatty acid alkanolamide-type nonionic surfactant used in the soap-based skin cleaning agent of the present invention is a nonionic surfactant in which a hydrophilic group and a base oil group are amide-bonded. The blending amount of the linear fatty acid alkanolamide type nonionic surfactant is required to be 3 to 5% by mass, preferably 3 to 4% by mass, based on the total amount of the soap-based skin cleansing agent.
The amount of the linear fatty acid alkanolamide type nonionic surfactant (the linear fatty acid monoethanolamide type nonionic surfactant is excluded from the target of the linear fatty acid alkanolamide type nonionic surfactant in the present invention) is 3 If it is less than 5% by mass, the low temperature stability deteriorates, and if the amount of the linear fatty acid alkanolamide type nonionic surfactant is more than 5% by mass, the viscosity becomes extremely thick, and the usability such as water solubility of the agent is deteriorated. Will occur.

The potash soap having a specific fatty acid composition used in the soap-based skin cleansing agent of the present invention has an anionic carboxylic acid as another surfactant. The amount of fatty acid in potash soap having a specific fatty acid composition requires 15 to 45% by mass of lauric acid, 10 to 40% by mass of myristic acid, and 0 to 35% by mass of palmitic acid with respect to the total amount of soap-based skin cleaning agent. Lauric acid is preferably 20 to 40% by mass, myristic acid is 15 to 35% by mass, and palmitic acid is 5 to 30% by mass. As these fatty acids, high-purity fatty acids may be mixed and used so as to have the above-mentioned fatty acid composition, or mixed fatty acids such as coconut oil fatty acid, palm kernel oil fatty acid, and palm oil fatty acid may be used. Constituent fatty acids may be appropriately added thereto to obtain the above-mentioned fatty acid composition. When a mixed fatty acid is used, a small amount of caprylic acid, capric acid, araquinic acid, behenic acid, stearic acid, oleic acid, linoleic acid, isostearic acid, etc. may be mixed, but the effect of the present invention is not impaired. It doesn't matter if there is.

The soap-based skin cleaning agent of the present invention contains the fatty acid and its potassium salt in a total amount of 15 to 40% by mass, preferably 20 to 30% by mass, and the mass ratio of fatty acid: potassium salt of fatty acid is 1:99 to It is 0: 100, preferably 0.5: 99.5 to 0: 100. Outside these ranges, it cannot remain transparent at low temperatures (0 ° C for 3 months) and have good foam quality and foam volume.

The water used in the soap-based skin cleanser of the present invention is pure water. The blending amount of water is required to be 45 to 75% by mass, preferably 60 to 70% by mass, based on the total amount of the soap-based skin cleansing agent.

The soap-based skin cleaning agent of the present invention can be produced by blending a fatty acid having the above composition and a potassium salt thereof, respectively, and typically contains potassium hydroxide heated to 60 to 90 ° C. An oil phase containing an excess amount of fatty acid heated and thawed at 60 to 90 ° C. was added to the aqueous solution with stirring, and the soap aqueous solution was added to an ethanol and linear fatty acid alkanolamide type nonionic surfactant at a temperature of 50 ° C. or lower. It can be produced by a method of adding a dispersed water-soluble polymer and sufficiently dispersing it, and it is preferable to adjust the pH to 9 to 10.

In addition to the above-mentioned components, the soap-based skin cleaning agent of the present invention contains other components, such as anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants, as long as the object of the present invention is not impaired. , Cationic polymer, nonionic polymer, powder (pigment, pigment, resin, etc.), preservative, fragrance, moisturizer, physiologically active ingredient, salts, solvent, neutralizer, pH adjuster, insect repellent , Enzymes and other components can be appropriately blended.

The anionic surfactant is not particularly limited, and for example, α-sodium lauroyl sulfonate, sodium myristyl allyl sulfonate, sodium lauryl naphthalene sulfonate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, etc. Examples thereof include sodium polyoxyethylene lauryl ether sulfate, potassium polyoxyethylene coconut oil fatty acid amide ether sulfate, sodium lauryl phosphate, potassium N-palm oil fatty acid glutamate, disodium lauryl sulfosuccinate, sodium polyoxyethylene lauryl ether acetate, and the like. One type or two or more types may be selected and used as appropriate.

The double-sided surfactant is not particularly limited, and is, for example, lauric acid amide propyl betaine, coconut oil fatty acid amide propyl betaine, lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl. Examples thereof include imidazolinium betaine, sodium laurylaminodiacetate, sodium β-aminopropionate, N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, etc., and one or more of them are appropriately selected and used. Just do it.

The nonionic surfactant is not particularly limited, but for example, polyoxyethylene cetyl ether, sorbitan monostearate, polyoxyethylene sorbitan triisostearate, polyoxyethylene hydrogenated coconut oil, and polyoxyethylene monoisosteer. Rate, glyceryl polyoxyethylene dioleate, coconut oil fatty acid diethanolamide, coconut oil fatty acid monoethanolamide, coconut oil fatty acid N-methylethanolamide, polyoxyethylene polyoxypropylene glycol monolaurate polyethylene glycol, etc. Alternatively, two or more types may be selected and used.

The cationized polymer is not particularly limited, but for example, O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethyl cellulose chloride and O- [2-hydroxy-3- (trimethyl) chloride. Ammonio) propyl] guar gum, dimethylallylammonium chloride / acrylamide copolymer, acrylamide / acrylic acid / dimethyldialylammonium chloride copolymer and the like can be mentioned, and one or more of them may be appropriately selected and used.

The nonionic polymer is not particularly limited, and examples thereof include hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, polyethylene glycol, highly polymerized polyethylene glycol, polyvinyl alcohol, and the like, and one or two as appropriate. You can select and use more than one species.

Examples of the powder include pigments such as Red No. 201, Yellow No. 4, Blue No. 1, Black No. 401, rake pigments such as Yellow No. 4 A1 Lake and Yellow No. 203 Ba Lake, nylon powder, and silk powder. Silicone powder, cellulose powder, silicone elastomer spherical powder, polymers such as polyethylene powder, colored pigments such as yellow iron oxide, red iron oxide, chromium oxide, carbon black, ultramarine blue, dark blue, and white pigments such as zinc oxide and titanium oxide. , Tarku, mica, sericite, kaolin and other extender pigments, mica titanium and other pearl pigments, barium sulfate, calcium carbonate, magnesium carbonate, magnesium silicate and other metal salts, silica, alumina and other inorganic powders, bentonite, smectite, Examples include boron nitride. The shape of these powders (spherical, rod-shaped, needle-shaped, plate-shaped, indefinite-shaped, fluff-shaped, spindle-shaped, etc.) is not particularly limited.

Examples of the physiologically active ingredient include substances that give some physiological activity to the skin when applied to the skin. For example, anti-inflammatory agents, anti-aging agents, UV protection agents, tightening agents, antioxidants, moisturizers, blood circulation promoters, antibacterial agents, bactericidal agents, desiccants, cooling agents, warming agents, vitamins, amino acids, Wound healing promoters, stimulant repellents, painkillers, cell activators, enzyme components and the like can be mentioned. Examples of the bioactive component include natural plant extract components, seaweed extract components, crude drug components, compounds, etc. Among these, natural plant extract components, seaweed extract components, and crude drug components are particularly safe. It is preferable in that.

Examples of the above-mentioned natural plant extract component, seaweed extract component, and crude drug component include, for example, Ashitaba extract, Amacha extract, Artea extract, Aloe extract, Anzu extract, Ginkgo extract, Wikyo extract, Woolong tea extract, Agetsu extract, Ogon extract, Oubaku extract, Otogirisou extract, Dutch mustard extract, orange extract, dried seawater, seaweed extract, hydrolyzed wheat powder, hydrolyzed silk, chamomile extract, carrot extract, kawarayomogi extract, licorice extract, kakyoku extract, kiwi extract, cucumber extract, Kuchinashi extract, Kumazasa extract, Clara extract, Walnut extract, Grapefruit extract, Chlorella extract, Kwa extract, Tea extract, Yeast extract, Collagen, Salvia extract, Sabonsou extract, Sanzashi extract, Jio extract, Shikon extract, Shiso extract, Shinanoki extract, Shakuyaku extract, Shirakaba extract, Sugina extract, Seiyoukizuta extract, Seiyousanzashi extract, Seiyouniwatoko extract, Seiyounokogirisou extract, Seiyouhakka extract, Sage extract, Senkyu extract, Senburi extract, Taisou extract, Thyme extract, Tea extract, Chouji extract, Chinpi extract, Touki Extract, Tounin extract, Dokudami extract, Tomato extract, Natto extract, Carrot extract, Garlic extract, Novara extract, Honey, Hamamelis extract, Hikiokoshi extract, Bisaborol, Biwa extract, Bukuryo extract, Propolis, Hechima extract, Peppermint extract, Bodaiju extract, Hop extract, Examples thereof include malonie extract, mukuroji extract, melissa extract, peach extract, yukinoshita extract, yuzu extract, yomogi extract, lavender extract, lemon extract, astragalus extract, rosemary extract, royal jelly extract and the like.

Examples of components other than the above-mentioned natural plant extract components, seaweed extract components, and crude drug components include deoxyribonucleic acid, mucopolysaccharide, sodium hyaluronate, sodium chondroitin sulfate, collagen, elastin, chitin, chitosan, and hydrolyzed eggshell. Biopolymers such as membranes, amino acids, sodium lactate, urea, sodium pyrrolidone carboxylate, betaine, moisturizing ingredients such as whey, oily ingredients such as sphingolipids, ceramides, cholesterol, cholesterol derivatives, phospholipids, ε-aminocaproic acid, glycyrrhizin Anti-inflammatory agents such as acids, β-glycyrrhetinic acid, lysozyme chloride, guaiazulene, hydrocortisone, vitamins (A, B2, B6, C, D, E), calcium pantothenate, biotin, nicotinic acid amide, vitamin C ester, etc. Active ingredients such as vitamins, allantin, diisopropylamine dichloroacetate, 4-aminomethylcyclohexanecarboxylic acid, antioxidants such as tocopherol, carotinoid, flavonoid, tannin, lignan, saponin, α-hydroxy acid, β-hydroxy acid, etc. Cell activators, blood circulation promoters such as γ-orizanol and vitamin E derivatives, bactericides such as isopropylmethylphenol, triclosan, hinokithiol and benzalconium chloride, cold sensitizers such as 1-menthol and peppermint oil, retinol and retinol derivatives Wound healing agents and the like can be mentioned.

Hereinafter, the present invention will be specifically described by exemplifying Examples and Comparative Examples, but the present invention is not limited to these Examples. First, the evaluation method and evaluation criteria used in the examples are shown.

(1) Low temperature stability (test method)
The transparency of the sample at 0 ° C. was evaluated according to the following evaluation criteria.
(Evaluation criteria)
◎: Very good low temperature stability Maintains transparency for 3 months or more ×: Poor low temperature stability Maintains transparency for less than 3 months

(2) Foam amount (test method)
80 mL of 1% aqueous solutions of the samples of Examples and Comparative Examples were placed in a cylindrical cylinder with a stirrer in a 1000 mL container, and the foam volume after stirring at 5000 rpm for 30 seconds was measured and evaluated according to the following evaluation criteria.
(Evaluation criteria)
⊚: Very good foam volume 500 mL or more ○: Good foam volume 400 mL or more and less than 500 mL Δ: Normal foam volume 300 mL or more and less than 400 mL ×: Poor foam volume Less than 300 mL

(3) Viscosity (test method)
The sample was measured for viscosity at 30 ° C. with a Brookfield viscometer and evaluated according to the following evaluation criteria.
(Evaluation criteria)
⊚: Very good viscosity 2000 mPa · s or more, less than 2500 mPa · s ○: Good viscosity 1500 mPa · s or more, less than 2000 mPa · s
2500 mPa ・ s or more and less than 3000 mPa ・ s Δ: Viscous normal 1000 mPa ・ s or more and less than 1500 mPa ・ s
3000 mPa ・ s or more and less than 3500 mPa ・ s ×: Poor viscosity Less than 1000 mPa ・ s, 3500 mPa ・ s or more

(4) Foam quality (test method)
The texture (creaminess) of the foam when the sample was used was evaluated by the expert panel of 8 people according to the following evaluation criteria.
(Evaluation criteria)
◎: Very good 7 or more people answered that the foam quality is good ○: Good 5 or more and less than 7 people answered that the foam quality is good △: Normal 3 or more people answered that the foam quality is good 5 Less than 3 people ×: Poor Less than 3 people answered that the foam quality is good

<Examples 1 to 9 and Comparative Examples 1 to 10>
Soap-based cleaning agents according to the formulations of Examples 1 to 9 and Comparative Examples 1 to 10 shown in Table 1 were prepared, and the transparency, foam amount, foam quality, and viscosity when these were used were investigated, and the results are shown in the table. Shown in 1.
In addition, the compounding amount in all the following Examples and Comparative Examples is mass%.

As is clear from Table 1, the cleaning agents of Examples 1 to 9 using the components of the present invention were found to have excellent performance as compared with the cleaning agents of Comparative Examples 1 to 10.

Claims (2)

A soap-based skin cleanser containing the following components (A) to (C).
(A) Ethanol 3 to 10% by mass
(B) Linear fatty acid methylethanolamide type nonionic surfactant 3 to 5% by mass
(C) Fatty acid: fatty acid having a mass ratio of potassium salt of fatty acid of 1: 99 to 0: 100 and its potassium salt 15 to 40% by mass. " By blending a linear fatty acid methylethanolamide type nonionic surfactant and ethanol into a soap-based skin cleanser consisting of fatty acids and potassium salts of fatty acids, the transparency of the soap-based skin cleanser is maintained in a low temperature environment. It's a method
The linear fatty acid methylethanolamide type nonionic surfactant is 3 to 5% by mass with respect to the soap-based skin cleanser.
The ethanol Ri 3-10% by mass relative to the previous SL soap skin cleanser,
The fatty acid and the potassium salt of the fatty acid are such that the mass ratio of the fatty acid: the potassium salt of the fatty acid is 1:99 to 0: 100, and the potassium salt of the fatty acid and the fatty acid is 15 to 40% by mass with respect to the soap-based skin cleaning agent. in it, a method of maintaining a transparency in a low-temperature environment of soap-based skin cleanser.