JP5570239B2 - Gel-like skin cleansing composition - Google Patents

Description

  The present invention relates to a gel-like skin cleansing composition.

  Various anionic surfactants are blended in the skin cleaning composition in order to impart a cleaning effect. Among these, higher fatty acid salts are most commonly used as components that impart excellent cleaning effects in dosage forms such as solid, semi-solid, and cream. However, the higher fatty acid salt-containing system is excellent in water familiarity, but has a problem that crystallization and liquefaction occur due to temperature change, resulting in poor formulation stability.

  Therefore, an attempt has been made to obtain a gel-like dosage form excellent in water familiarity using an anionic surfactant other than the higher fatty acid salt. For example, attempts have been made to thicken a composition containing an anionic surfactant with an amphoteric surfactant or a cationic polymer.

  Specifically, a gel-like skin cleanser containing an anionic surfactant, an amphoteric surfactant, and a polyoxyethylene diester (see, for example, Patent Documents 1 and 2), a specific anionic interface A gel-like cleaning composition containing an active agent, a specific amphoteric surfactant, and a specific nonionic surfactant (see, for example, Patent Document 3), a fatty acyl isethionate, and a cleaning agent A gel-type cleaning composition containing a cationic polymer and silicone (for example, see Patent Document 4) has been proposed.

  However, based on these attempts, although it can be once made into a gel-like dosage form, the anionic surfactant is hydrophobized by the amphoteric surfactant and the cationic polymer, so that water separation tends to occur. Therefore, there is a problem that the preparation stability is poor.

Japanese Patent Laid-Open No. 9-20617 Japanese Patent Laid-Open No. 11-106331 JP 2003-277791 A JP 7-509707 A

  The present invention has been made in view of the above prior art, and can suppress water separation caused by hydrophobization of anionic surfactants other than higher fatty acid salts, and enhance water familiarity. It is an object of the present invention to provide a gel-like skin cleansing composition that can be easily washed off.

That is, the present invention relates to ( A) anionic surfactant other than higher fatty acid salt, (B) sodium magnesium silicate, (C) (meth) acrylic acid alkyl copolymer, and (D) (meth) acrylic. Gels comprising acid / (meth) acrylate alkyl / (meth) acrylic acid polyoxyethylene alkyl ether copolymer and / or (meth) acrylic acid / (meth) acrylate alkyl / itaconic acid polyoxyethylene alkyl ether copolymer about the Jo skin cleansing composition.
In the present specification, “(meth) acryl” means both “acryl” and “methacryl”.

  The gel-like skin cleansing composition of the present invention suppresses water separation caused by the hydrophobization of anionic surfactants other than higher fatty acid salts, and exhibits an excellent formulation stability. Moreover, since it is remarkably excellent in the familiarity with water, there exists an effect that it can wash off easily at the time of rinsing.

  The gel-like skin cleansing composition of the present invention comprises (A) anionic surfactant other than higher fatty acid salt, (B) sodium magnesium silicate, (C) alkyl (meth) acrylate copolymer, and (D). Contains specific copolymers or crosspolymers.

  The anionic surfactant other than the higher fatty acid salt of the component (A) is not particularly limited as long as it has a sufficient cleaning effect. Specific examples include sodium lauryl sulfate, triethanolamine lauryl sulfate, and myristyl. Alkyl sulfate esters such as sodium sulfate, sodium stearyl sulfate, sodium oleyl sulfate, sodium cetyl sulfate; polyoxyethylene alkyl ether sulfates such as sodium polyoxyethylene lauryl ether sulfate and sodium polyoxyethylene myristyl sulfate; tetradecene sulfonic acid Α-olefin sulfonates such as sodium; myristoyl methyl taurine sodium, palmitoyl methyl taurine sodium, stearoyl methyl taurine sodium, oleoyl methyl taurine sodium N-acylmethyl taurine salts such as sodium and palm oil fatty acid methyl taurine sodium; sulfosuccinic acid alkyl salts such as dioctyl sodium sulfosuccinate and lauryl disodium sulfosuccinate; polyoxyethylene alkyl sulfosuccinates such as polyoxyethylene lauryl disodium sulfosuccinate Salts; monoalkyl phosphate salts such as sodium lauryl phosphate, sodium cetyl phosphate, diethanolamine cetyl phosphate; sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, Sodium polyoxyethylene alkylphenyl ether phosphate, polyoxyethylene alkylphenyl ether phosphate trieta Polyoxyethylene alkyl ether phosphate ester salts such as noramine; N-acyl sarcosine salts such as lauroyl sarcosine potassium, lauroyl sarcosine triethanolamine, sodium myristoyl sarcosine, coconut oil fatty acid sarcosine sodium; lauroylmethylalanine sodium, lauroylmethylalanine triethanol N-acyl-N-methyl-β-alanine salts such as amine, sodium myristoyl methylalanine, sodium palm oil fatty acid methylalanine; sodium lauroyl glutamate, triethanolamine lauroyl glutamate, sodium myristoyl glutamate, potassium stearoyl glutamate, disodium stearoyl glutamate , Palm oil fatty acid sodium acyl glutamate N-acylglutamate such as coconut oil fatty acid acylglutamate triethanolamine; N-acylglycine salt such as coconut oil fatty acid acylglycine potassium and coconut oil fatty acid acylglycine sodium; sodium lauryl glycol acetate (dodecane-1,2-diolacetic acid Sodium), potassium lauryl glycol acetate, sodium myristyl glycol acetate, potassium myristyl glycol acetate, sodium palmityl glycol acetate, potassium palmityl glycol acetate, sodium stearyl glycol acetate, potassium stearyl glycol acetate, sodium behenyl glycol acetate, potassium behenyl glycol acetate, etc. Examples thereof include alkyl ether glycol acetates. These components may be used alone or in appropriate combination of two or more.

  The content of the component (A) is not particularly limited as long as a desired effect is imparted, but usually 1% by mass or more is preferable in the composition from the viewpoint of detergency, and more preferably 2% by mass or more. It is. Moreover, from a viewpoint of formulation stability, 60 mass% or less is preferable, More preferably, it is 40 mass% or less. From these viewpoints, the content of the component (A) is preferably 1 to 60% by mass, more preferably 2 to 40% by mass.

  The component (B), sodium silicate / magnesium, can provide the desired effect, whether it is sodium silicate / magnesium silicate purified from natural clay minerals or synthesized sodium / magnesium silicate. If it is done, it will not specifically limit. In the present invention, hectorite, which is a smectite group clay mineral mainly composed of sodium silicate / magnesium, may be used as it is.

  In addition, a commercial item can also be used for the said (B) component. Specifically, for example, Laponite XLG (trade name, manufactured by Rockwood), Smecton SA (trade name, manufactured by Kunimine Industries) and the like can be exemplified.

  The content of the component (B) is not particularly limited as long as a desired effect is imparted, but usually 0.0001% by mass or more is contained in the composition from the viewpoint of suppressing water separation and improving formulation stability. Preferably, it is 0.01 mass% or more. Moreover, 2 mass% or less is preferable from a viewpoint of formulation, More preferably, it is 1.5 mass% or less. From these viewpoints, the content of the component (B) is preferably 0.0001 to 2% by mass, more preferably 0.01 to 1.5% by mass.

  (C) Component (meth) acrylic acid alkyl copolymer is an alkyl acrylate (C1-4, C8) and alkyl methacrylate (C1-4, C8), two or more components among acrylic acid and methacrylic acid It is a copolymer consisting of. The component (C) used in the present invention is commercially available under trade names such as Pemulen TR-1, TR-2 and Carbopol ETD2020, and is generally referred to as an acrylic acid / alkyl methacrylate copolymer. The structure is different.

  In addition, as a commercial item of the said (C) component, Aculine TM33A (A brand name, the product made from a Rohm and Haas Japan company) can be illustrated.

  The component (C) is usually used after neutralizing with a basic substance. Examples of the basic substance include alkanolamines such as triethanolamine and monoethanolamine, inorganic bases such as ammonia, sodium hydroxide and potassium hydroxide, and basic amino acids such as arginine. Moreover, the addition amount of the basic substance is an amount sufficient to neutralize the copolymer of the above component (C), and may be appropriately blended depending on the kind and amount of use of these components.

  The content of the component (C) is not particularly limited as long as a desired effect is imparted. However, in general, from the viewpoint of suppressing the water separation and improving the stability of the preparation, 0.01% by mass or more is contained in the composition. Preferably, it is 0.1% by mass or more. Moreover, 10 mass% or less is preferable from a viewpoint of water familiarity and washing-off, More preferably, it is 8 mass% or less. From these viewpoints, the content of the component (C) is preferably 0.01 to 10% by mass, more preferably 0.1 to 8% by mass.

The copolymer or cross polymer of component (D) is at least one selected from the group consisting of copolymers and cross polymers consisting of the following (a) and (b).
(A) (meth) acrylic acid and / or alkyl (meth) acrylate (b) itaconic acid polyoxyethylene alkyl ether, (meth) acrylic acid polyoxyethylene alkyl ether or vinyl neodecanoate

  Examples of the (D) component copolymer include (meth) acrylic acid / (meth) alkyl acrylate / (meth) acrylic acid polyoxyethylene alkyl ether copolymer, (meth) acrylic acid / (meth) acrylic acid alkyl / itacon And acid polyoxyethylene alkyl ether copolymers. Moreover, as a cross polymer, (meth) acrylic acid / (meth) acrylic acid alkyl / (meth) acrylic acid polyoxyethylene alkyl ether crosspolymer, (meth) acrylic acid / (meth) acrylic acid alkyl / neodecanoic acid, for example A vinyl cloth polymer etc. are mentioned. The number of moles of ethylene oxide to be polymerized is not particularly limited.

  Specifically, (meth) acrylic acid / (meth) such as acrylates / polyoxyethylene cetyl ether copolymer, acrylates / polyoxyethylene stearyl ether copolymer, acrylates / polyoxyethylene behenyl ether copolymer (Meth) acrylic acid / (meth) acrylic acid such as alkyl acrylate / (meth) acrylic acid polyoxyethylene alkyl ether copolymer; acrylates / itaconic acid polyoxyethylene cetyl ether copolymer, acrylates / itaconic acid polyoxyethylene stearyl ether copolymer Alkyl / Itaconic acid polyoxyethylene alkyl ether copolymer; Acrylates / Polyoxyethylene stearyl ether cross polymer (Meth) acrylic acid / (meth) acrylic acid such as (meth) acrylic acid / (meth) acrylic acid alkyl / (meth) acrylic acid polyoxyethylene alkyl ether cross polymer; alkyl acrylate / neodecanoic acid vinyl cross polymer An alkyl / vinyl neodecanoate crosspolymer can be exemplified. These components may be used alone or in appropriate combination of two or more.

  Suitable components (D) include (meth) acrylic acid / (meth) alkyl acrylate / (meth) acrylic acid polyoxyethylene alkyl ether copolymer, (meth) acrylic acid / (meth) acrylic acid alkyl / itaconic acid poly It is preferred to use oxyethylene alkyl ether copolymers.

  The component (D) is usually used after neutralizing with a basic substance. Examples of the basic substance include alkanolamines such as triethanolamine and monoethanolamine, inorganic bases such as ammonia, sodium hydroxide and potassium hydroxide, and basic amino acids such as arginine. Moreover, the addition amount of the basic substance is an amount sufficient to neutralize the copolymer or the cross polymer, and may be appropriately blended according to the type and amount of use of these components.

  In addition, a commercial item can also be used for the said (D) component. Commercially available products of (meth) acrylic acid / (meth) acrylic acid alkyl / (meth) acrylic acid polyoxyethylene alkyl ether copolymer include, for example, Aculin TM22, TM28 (trade names, both of which are Rohm and Haas Japan, Inc. For example). Examples of commercially available products of (meth) acrylic acid / (meth) acrylic acid alkyl / itaconic acid polyoxyethylene alkyl ether copolymer include STRUCTURE 2001, 3001 (trade names, both manufactured by National Starch). .

  The content of the component (D) is not particularly limited as long as a desired effect is imparted, but usually, 0.01% by mass or more is contained in the composition from the viewpoint of suppressing water separation and improving formulation stability. Preferably, it is 1 mass% or more. Moreover, 10 mass% or less is preferable from a viewpoint of water familiarity and washing-off, More preferably, it is 8 mass% or less. From these viewpoints, the content of the component (D) is preferably 0.01 to 10% by mass, more preferably 1 to 8% by mass.

  In addition, the gel-like skin cleansing composition of the present invention can contain an amphoteric surfactant from the viewpoint of improving stability due to increased viscosity and improving foam quality. Examples of the amphoteric surfactant used include amidopropyl betaine-type amphoteric surfactants and aminoacetic acid betaine-type amphoteric surfactants. Specific examples of amidopropyl betaine-type amphoteric surfactants include coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, and ricinoleic acid amidopropyl betaine. Specific examples of aminoacetic acid betaine type amphoteric surfactants include lauryldimethylaminoacetic acid betaine, coconut oil alkyldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, stearyl dihydroxyethyl betaine, and the like. These components may be used alone or in appropriate combination of two or more. As a suitable amphoteric surfactant, it is preferable to use an amidopropyl betaine type amphoteric surfactant from the viewpoint of stability improvement and foam quality improvement, and among them, lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, myristin It is more preferable to use acid amidopropyl betaine.

  The content of the amphoteric surfactant is not particularly limited as long as a desired effect is imparted, but usually 0.01% by mass or more is included in the composition from the viewpoint of improving stability and improving foam quality. Preferably, it is 0.1% by mass or more. Moreover, from a viewpoint of familiarity with water, 20 mass% or less is preferable, More preferably, it is 15 mass% or less. From these viewpoints, the content of the amphoteric surfactant is preferably 0.01 to 20% by mass, more preferably 0.1 to 15% by mass.

  Further, the gel-like skin cleansing composition of the present invention may contain a cationic polymer from the viewpoint of further improving the stability of the preparation by suppressing water separation and improving the foam quality. Examples of the cationic polymer used include quaternary nitrogen-containing cellulose ether derivatives such as diallyldimethylammonium chloride / hydroxyethylcellulose, glycidyltrimethylammonium chloride / hydroxyethylcellulose, and hydroxypropyltrimethylammonium chloride / hydroxyethylcellulose; hydroxypropyltrimethyl chloride Quaternary nitrogen-containing guar gum derivatives such as ammonium and guar gum; diallyl quaternary ammonium salt polymers such as dimethyldiallylammonium chloride; diallyl quaternary ammonium salts and acrylamide copolymers such as dimethyldiallylammonium chloride and acrylamide copolymers A quaternized derivative of vinylpyrrolidone / dimethylamino methacrylate copolymer and dimethyl sulfate; Quaternized vinylpyrrolidone derivatives such as rupyrrolidone / dimethylaminopropylmethacrylamide / lauryldimethylaminopropylmethacrylamide chloride copolymer; cationic starch, polyglycol polyamine condensate, adipic acid / dimethylaminohydroxypropylethylenetriamine copolymer Product, cationized dextran, and the like. These components may be used alone or in appropriate combination of two or more. As a suitable cationic polymer, diallyl quaternary ammonium salt is preferably used from the viewpoint of stability and usability, and dimethyl diallylammonium chloride acrylamide is more preferable.

  The content of the cationic polymer is not particularly limited as long as a desired effect is imparted, but usually 0.001% by mass or more is preferable in the composition from the viewpoint of stability and feeling of use, and more preferable. Is 0.05 mass% or more. Moreover, 2 mass% or less is preferable from a viewpoint of washing off, More preferably, it is 1 mass% or less. From these viewpoints, the content of the cationic polymer is preferably 0.001 to 2% by mass, more preferably 0.05 to 1% by mass.

  In the gel-like skin cleansing composition according to the present invention, ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, 1, 3 in addition to the components described above, as long as the effects of the present invention are not impaired. -Butylene glycol, glycerin, concentrated glycerin, diglycerin, triglycerin, glucose, maltose, maltitol, sucrose, mannitol, sorbitol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, etc. Polyhydric alcohol; refreshing agents such as menthol, menthyl glyceryl ether, camphor; antioxidants, metal sequestering agents, silicones, vitamins, animal and plant extracts, pearling agents, coloring agents, various fragrances, preservatives, water, etc. You may mix | blend suitably according to the objective.

  The gel-like skin cleansing composition of the present invention is preferably used in the form of a facial cleanser because it has an excellent effect of washing off and provides a refreshing feeling after washing.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to these Examples. The blending amount represents “% by mass” unless otherwise specified. Moreover, (C) component and (D) component were converted into the pure part of the copolymer or the cross polymer.

(Sample preparation)
According to the composition described in Table 1 and Table 2, the gel-like skin washing composition of Examples 1-6 and Comparative Examples 1-7 was prepared, and it used for the following evaluation test. The results are shown in Table 1 and Table 2, respectively.

(Test Example 1: Evaluation of formulation stability)
Each sample obtained in Examples and Comparative Examples is filled in a 50 mL transparent glass container, visually observed for 1 month in each thermostatic bath at 5 ° C. and 40 ° C., and in accordance with the following evaluation criteria. evaluated.

<Evaluation criteria for formulation stability (5 ° C.)>
◎: Maintains a gel-like shape ○: Maintains a gel-like shape, but slight water separation is observed on the surface or slight crystallization (precipitation) is observed Δ: Gel-like shape The shape is not maintained, and clear water separation is observed on the surface, or clear crystallization (precipitation) is observed. X: Water separation (separation)

<Evaluation criteria for formulation stability (40 ° C.)>
◎: Maintains a gel-like shape ○: Maintains a gel-like shape, but slight water separation is observed on the surface or slight liquefaction is observed Δ: Maintains a gel-like shape No clear water separation is observed on the surface, or clear liquefaction is observed x: liquefied

(Test Example 2: Evaluation of feeling of use)
Twenty sensory evaluation panels allowed each sample obtained in the examples and comparative examples to actually be used in the form of a facial cleanser. Before washing, “familiarity with water” and after treatment “washing off (easy to rinse) )) Was subjected to sensory evaluation according to the following evaluation criteria.
In addition, about familiarity with water, familiarity with the water on the palm just before face-washing was evaluated.

<Evaluation criteria for familiarity with water>
◎: Answer that 16 or more of 20 people are excellent in water familiar ○: Answer that 11 to 15 in 20 people are excellent in water familiar △: Answer that 6 to 10 of 20 people are excellent in water familiar ×: 20 Less than 5 of the names responded that they were very familiar with water

<Evaluation criteria for wash-off (ease of rinsing)>
◎: More than 16 out of 20 people answered that it was easy to wash out and easy to wash ○: 11-15 out of 20 people answered that it was easy to wash off and easy to wash △: 6-10 out of 20 people were washed out Answer: Excellent and easy to rinse ×: 5 out of 20 responded that it was easy to wash and easy to rinse

  From the results of Tables 1 and 2, the gel-like skin cleansing compositions of each example suppressed water separation due to hydrophobicization of anionic surfactants other than higher fatty acid salts, as compared with those of each comparative example. It can be seen that the preparation stability is remarkably improved. Moreover, since it is excellent in the water familiarity at the time of a treatment and can be easily washed off after washing | cleaning, it turns out that it is excellent in the ease of rinsing.

  On the other hand, the gel-like skin cleansing compositions of Comparative Examples 1 to 6 that do not satisfy the three components (B), (C), and (D) did not show an excellent effect on all the evaluation items. It was. From this, it can be said that it is essential to satisfy the three components (B), (C), and (D) in order to maximize the effects of the present invention. In addition, as shown in Comparative Example 7, even when the three components (B), (C), and (D) are satisfied, when a higher fatty acid salt is used as the anionic surfactant, It can be seen that although the feeling of use is excellent, the preparation stability is poor.

  Hereinafter, formulation examples of the gel-like skin cleansing composition according to the present invention are shown. In addition, content is mass%. POE is an abbreviation for polyoxyethylene.

(Prescription Example 1)
Sodium lauryl glycol acetate 10.0
Synthetic sodium silicate and magnesium 1.5
Alkyl acrylate copolymer 1.0
Acrylates / methacrylic acid POE stearyl ether copolymer 2.5
Amidopropyl betaine laurate 6.0
Dimethyldiallylammonium chloride acrylamide 0.15
Xanthan gum 0.1
Glycerin 15.0
Dipropylene glycol 5.0
Potassium hydroxide appropriate amount Preservative appropriate amount Metal chelating agent appropriate amount
Purified water balance part Total 100.0

(Prescription example 2)
Sodium lauryl glycol acetate 5.0
Synthetic sodium silicate / magnesium 1.0
Alkyl acrylate copolymer 0.5
Acrylates / methacrylic acid POE stearyl ether copolymer 1.5
Acrylates / methacrylic acid POE stearyl ether crosspolymer 0.2
Amidopropyl betaine laurate 4.0
Dimethyldiallylammonium chloride / acrylamide 0.1
Xanthan gum 0.1
Glycerin 5.0
Dipropylene glycol 15.0
Potassium hydroxide appropriate amount Preservative appropriate amount Metal chelating agent appropriate amount
Purified water balance part Total 100.0

(Prescription Example 3)
Sodium lauryl glycol acetate 2.0
Synthetic sodium silicate / magnesium 0.3
Alkyl acrylate copolymer 0.2
Acrylates / methacrylic acid POE stearyl ether copolymer 0.8
Acrylates / methacrylic acid POE stearyl ether crosspolymer 0.1
Amidopropyl betaine laurate 1.5
Dimethyldiallylammonium chloride acrylamide 0.03
Xanthan gum 0.2
Glycerin 3.0
Dipropylene glycol 15.0
1,2-pentanediol 1.0
Octoxyglycerin 0.5
Potassium hydroxide appropriate amount Preservative appropriate amount Metal chelating agent appropriate amount
Purified water balance part Total 100.0

Claims (1)

(A) Anionic surfactant other than higher fatty acid salt, (B) Sodium magnesium silicate, (C) (meth) acrylic acid alkyl copolymer, and (D) (meth) acrylic acid / (meth) acrylic Gel-like skin cleansing composition comprising alkyl acid / (meth) acrylic acid polyoxyethylene alkyl ether copolymer and / or (meth) acrylic acid / (meth) acrylic acid alkyl / itaconic acid polyoxyethylene alkyl ether copolymer .