Powdered skin cleanser and method for producing the same

Abstract

To provide a powdered skin cleanser that quickly dissolves in water at the time of use, offers a superior foaming sensation, and furthermore exhibits excellent long-term stability over time.SOLUTION: A powdered skin cleanser comprises: (a) 3 to 40 mass% of an N-acylglycine salt and / or an N-acylaspartate salt; (b) an N-acylmethyltaurine salt; (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol; and (d) 1 to 20 mass% of dextrin having a reducing sugar content of 10% or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a powdery skin cleanser that dissolves quickly in water during use, foams well, and has excellent long-term stability, and a method for producing the same. [Background technology]

[0002] In recent years, many powdered skin cleansers, such as facial cleansing powders, have been released, gaining recognition in the market and widespread support. Powdered skin cleansers have lower bulk density and lighter mass than creamy emulsion cleansers, making them highly portable. Furthermore, because they contain virtually no water, they avoid the risk of quality defects often seen with creamy emulsion cleansers, such as syneresis at high temperatures and solidification at low temperatures. Another advantage is that various active ingredients, including enzymes such as protease and papain, can be formulated stably over time without being inactivated.

[0003] Amino acid-based anionic surfactants are often used as cleansing ingredients in powdered skin cleansers (Patent Document 1). The reasons for this include that they are less irritating to the skin than synthetic surfactants, and amino acids, which are natural moisturizing factors, gently remove dirt while retaining moisture in the skin. Furthermore, dextrin is used in powdered skin cleansers to improve functionality, such as water solubility, foam volume, and foam quality, during use (Patent Documents 2 and 3).

[0004] However, powdered skin cleansers that combine amino acid-based anionic surfactants with dextrin have problems with long-term stability, such as turning yellow over time and emitting a sweet odor, which is thought to be due to the Maillard reaction.

[0005] The Maillard reaction, a well-known reaction in the food industry, occurs when the carbonyl groups of reducing sugars react with the amino groups of proteins, producing brown substances and a sweet odor. While the Maillard reaction has the positive side of producing delicious-looking coloring and rich flavor, it also has the negative side of significantly reducing the quality of the original taste and flavor if the reaction proceeds too far. For this reason, it is important to suppress the Maillard reaction for products that must maintain stable quality over the long term.

[0006] Meanwhile, in the cosmetics industry, although there are many cleansers containing amino acid-based anionic surfactants and dextrin, which are the cause of the Maillard reaction, there has been little description of cleansers that combine both ingredients, possibly due to concerns about their stability over time.While powdered skin cleansers that combine amino acid-based anionic surfactants and dextrin have a very good feel when used, there are concerns about the Maillard reaction occurring when the two ingredients coexist, and the issue of stability over time has yet to be resolved. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4257442 [Patent Document 2] Patent No. 3957527 [Patent Document 3] Patent No. 6759395 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to provide a powdery skin cleanser that dissolves quickly in water during use, foams well, and has excellent long-term stability. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to solve this problem and have found that Contains the following (a), (b), (c), and (d): (a) N-acylglycine salt and / or N-acylaspartate salt (b) N-acylmethyltaurine salts (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol; (d) Dextrin containing 10% or less reducing sugars We have found that this problem can be solved by a powdery skin cleanser characterized by the content of component (a) being 3 to 40 mass% based on the total powdery skin cleanser, and the content of component (d) being 1 to 20 mass% based on the total powdery skin cleanser, and based on this, we have completed the present invention.

[0010] The present invention includes the following (a), (b), (c), and (d): (a) N-acylglycine salt and / or N-acylaspartate salt (b) N-acylmethyltaurine salts (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol; (d) Dextrin containing 10% or less reducing sugars The powdery skin cleanser is characterized in that the content of component (a) is 3 to 40 mass% of the total powdery skin cleanser, and the content of component (d) is 1 to 20 mass% of the total powdery skin cleanser.

[0011] The content of the component (b) N-acylmethyl taurine salt is preferably 1 to 10% by mass based on the total amount of the powdery skin cleanser. The content of the sugars and sugar alcohols as component (c) is preferably 1 to 10% by mass based on the total amount of the powdery skin cleanser.

[0012] The present invention also relates to a method for producing a powdery skin cleanser, which comprises a step of granulating a mixture containing the following (a), (b), (c), and (d) by a fluidized bed granulation method while spraying a polysaccharide-containing dispersion containing water: (a) 3 to 40% by mass of N-acylglycine salt and / or N-acylaspartate salt (b) N-acylmethyltaurine salts (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol; (d) 1 to 20% by mass of dextrin with a reducing sugar content of 10% or less

[0013] The amount of the polysaccharide-containing dispersion liquid containing water to be sprayed is preferably 30 to 70% by mass based on the mixture. [Effects of the Invention]

[0014] The present invention provides a powdery skin cleanser that dissolves quickly in water during use, foams well, and has excellent long-term stability. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described in detail below. In this specification, the symbol "to" means a range including the numerical values ​​before and after it.

[0016] As the N-acylglycine salt of component (a) used in the present invention, sodium N-cocoate acylglycine and potassium N-cocoate acylglycine are commercially available and are preferably used. As the N-acylaspartate salt, sodium N-lauroyl aspartate is commercially available and is preferably used. The N-acylglycine salt and the N-acylaspartate salt may be used alone or in combination. Preferably, using them in combination can improve foaming and detergency.

[0017] The content of (a) N-acylglycine salt and / or N-acylaspartate salt is preferably 3 to 40% by mass, more preferably 5 to 30% by mass, based on the mass of the powdery skin cleanser, whether used alone or in combination. If it is less than 3% by mass, foaming and cleansing properties may deteriorate, while if it exceeds 40% by mass, hygroscopicity may increase, leading to concerns about poor stability over time.

[0018] As the (b) N-acyl methyl taurine salt used in the present invention, sodium lauroyl methyl taurate, sodium myristoyl methyl taurate, sodium stearoyl methyl taurate, sodium oleoyl methyl taurate, and sodium coconut oil fatty acid methyl taurate are commercially available and are preferably used because they foam well and provide a good foam quality when used.

[0019] The N-acylmethyl taurine salt (b) is preferably blended in an amount of 1 to 10% by mass relative to the mass of the powdered skin cleanser, which is preferable because it produces a powdered skin cleanser that foams well and has good foam quality.

[0020] The one or more sugars or sugar alcohols (c) selected from sucrose, maltose, trehalose, lactose, glycerin, diglycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol used in the present invention improve water solubility during use, provide a good foaming sensation, and maintain a moderate moisturizing sensation. Glycerin, diglycerin, sorbitol, and maltitol are particularly preferred.

[0021] The sugars and sugar alcohols (c) are preferably blended in a proportion of 1 to 10% by mass relative to the mass of the powdered skin cleanser. This blending amount is preferred because it provides a good foaming feel and maintains a moderate level of moisture.

[0022] The dextrin (d) used in the present invention can improve functionality such as water solubility during use, foam volume, and foam quality. It is particularly preferable to use a dextrin with a reducing sugar content of 10% or less. If the reducing sugar content exceeds 10%, the product may turn yellow over time, develop a sweet odor, and maintain long-term stability.

[0023] The dextrin (d) is preferably blended in a proportion of 1 to 20% by mass, more preferably 5 to 10% by mass, relative to the mass of the powdered skin cleanser. This blending amount allows for rapid dissolution in water during use, and maintains a good foaming sensation and long-term stability over time. If the blending amount is less than 1% by mass, the foaming and foam quality will be poor, making it difficult to achieve a good feeling in use. On the other hand, if the blending amount exceeds 20% by mass, the Maillard reaction will proceed, tending to reduce stability over time.

[0024] The powdery skin cleanser of the present invention is preferably prepared by granulating a mixture containing the above-mentioned components (a), (b), (c), and (d) to form granules. Furthermore, the method for producing the powdery skin cleanser of the present invention may be a fluidized bed granulation method in which a polysaccharide-containing dispersion containing water is sprayed onto a mixture containing the above-mentioned (a), (b), (c), and (d), or may be another granulation method such as agitation granulation method, tumbling granulation method, or extrusion granulation method, but the fluidized bed granulation method is particularly preferred because it is easy to obtain porous, soft, uniform spherical particles.

[0025] Fluidized bed granulation is a method of granulating powder by spraying a binder onto powder blown into a hot air current. In principle, this method is suitable for use in the present invention because it is easy to obtain porous, soft, uniform spherical particles and has significantly better drying efficiency. The procedure can be performed according to a standard method without any particular restrictions, but it is necessary to adjust the conditions, such as the inlet air temperature, inlet air volume, spray liquid velocity, spray air pressure, drying temperature, and drying time, as needed, depending on the charge amount and charge formulation.

[0026] In the method for producing a granular skin cleanser of the present invention, the amount of the polysaccharide-containing dispersion containing water to be sprayed is preferably 30 to 70% by mass relative to the total amount of the granulation ingredients, including the surfactant and excipients that are essential ingredients in the fluidized bed granulation method. This range is preferable because it makes it easier to obtain porous, soft, and uniform spherical particles.

[0027] The polysaccharide contained in the polysaccharide-containing dispersion is not particularly limited, and examples thereof include hydroxypropyl methylcellulose, hydroxypropyl cellulose, sodium alginate, etc. The use of the polysaccharide as a binder is preferred in that it acts as a binding agent between particles, and by evaporating the water after spraying, porous and soft granules can be obtained.

[0028] The granules obtained by fluidized bed granulation may be sieved through a 20-mesh sieve (openings 840 μm) or the like to adjust the particle size, if necessary. The powdery skin cleanser of the present invention preferably contains powder with a particle size that passes through a 200-mesh sieve (openings 74 μm) in a proportion of 20% by mass or less, more preferably 10% by mass or less, of the total amount. A powdery skin cleanser with adjusted particle size is preferable because it improves water solubility during use, is smooth, and lathers well. Furthermore, the powder is less likely to scatter, improving the efficiency of operations such as measuring, filling, and finishing, making it possible to divide the product into individual packets according to the amount used, if necessary.

[0029] In addition to the above-mentioned components, the powdery skin cleanser of the present invention can contain components commonly used in ordinary cosmetics to the extent that the intended effects of the present invention are not impaired. For example, the powdery skin cleanser of the present invention can be produced by adding surfactants other than the above-mentioned essential surfactants, excipients, binders, thickeners, moisturizers, sequestering agents, preservatives, fragrances, colorants, astringents, anti-inflammatory agents, enzymes, vitamins, etc. Depending on their properties, these components may be used as powder components or may be dissolved or dispersed in a dispersion liquid.

[0030] In addition to the surfactants that are essential components of powdered skin cleansers, the sensory properties, including foam quality, may be improved by including one or more of higher fatty acid salts, acyl glutamates, alkyl betaines, acylated isethionates, etc.

[0031] Suitable fillers include inorganic powders such as talc, mica, sericite, kaolin, bentonite, barium sulfate, and silicic anhydride, and organic powders such as starch and crystalline cellulose. The amount of filler is not particularly limited, but is generally preferably 20 to 70% by mass. If the amount is less than 20% by mass, it is difficult to obtain the effect of the filler, and if the amount is more than 70% by mass, foaming tends to be inhibited.

[0032] In the powdery skin cleanser of the present invention, the content of the above-mentioned talc is preferably 50% by mass or less relative to the mass of the powdery skin cleanser. If the talc content exceeds 50% by mass, foaming tends to be inhibited, and sufficient foaming cannot be obtained, which is undesirable.

[0033] The powdered skin cleanser of the present invention is substantially free of water. In other words, since the water in the spray solution evaporates and disappears during the granulation process, the powdered skin cleanser that is the final product is free of water. This has the advantage that ingredients that are easily hydrolyzed can be stably blended. [Example]

[0034] The present invention will now be described in more detail with reference to examples, in which the contents are expressed as % by mass in the powdery skin cleanser.

[0035] [Manufacturing method] Examples 1 to 12, Comparative Examples 1 to 10 (1) The specified proportions of each of ingredients 1 to 24 in Tables 1 and 2 were weighed out on a scale of approximately 150 g and mixed uniformly using a stirring mixer. The mixture was then placed in a fluidized bed granulator (Freund Corporation, FL-MINI) and preheated and premixed until the exhaust temperature reached approximately 40°C while fluidizing and mixing at an intake air flow rate of 0.1 to 0.4 m3 / min. (2) Components 25 to 28 in Tables 1 and 2 were weighed out in advance in predetermined proportions, and uniformly dispersed and swelled using a stirring mixer. (3) (1) was fluidly mixed at an inlet air temperature of 65 to 90°C and an inlet air volume of 0.1 to 0.4 m3 / min while (2) was sprayed at a liquid rate of 1 to 5 mL / min to granulate, and then dried until the exhaust temperature reached 32 to 42°C to obtain granules. (4) (3) was taken out and sieved through a 20 mesh sieve (openings 840 μm) to prepare a sample.

[0036] [Evaluation method] <Water solubility and smoothness (no roughness) during use> 0.5 g of each sample from the Examples and Comparative Examples was placed on a wet palm, and a small amount of tap water was added to create a lather. The degree of wetting and smoothness were judged by visual observation and touch. ◎: Quickly penetrates and feels smooth to the touch ○: Slightly rough, but smooth to the touch △: Feels slightly rough ×: Not absorbed quickly, feels rough

[0037] <Foaming> A total of 10 male and female subjects washed their faces with 0.5 g of each sample from the Example and Comparative Examples. A sensory evaluation was conducted, with each subject assigned a score of 5 points, and the total scores of the 10 subjects were evaluated according to the following criteria. 5 points: Very good foaming 4 points: Good foaming 3 points: Slightly foamy 2 points: Slightly poor foaming 1 point: Very poor foaming ◎: Total score of 10 people is 40-50 points ○: Total score of 10 people is 30-39 points △: Total score of 10 people is 20-29 points ×: Total score of 10 people is 0-19 points

[0038] <Foam quality (foam firmness)> A total of 10 male and female subjects washed their faces with 0.5 g of each sample from the Example and Comparative Examples. A sensory evaluation was conducted, with each subject assigned a score of 5 points, and the total scores of the 10 subjects were evaluated according to the following criteria. 5 points: Very good foam quality (foam firmness) 4 points: Good foam quality (foam firmness) 3 points: Fairly good foam quality (foam firmness) 2 points: Slightly poor foam quality (foam firmness) 1 point: Very poor foam quality (foam firmness) ◎: Total score of 10 people is 40-50 points ○: Total score of 10 people is 30-39 points △: Total score of 10 people is 20-29 points ×: Total score of 10 people is 0-19 points

[0039] <Cleaning effect> A total of 10 male and female subjects washed their faces with 0.5 g of each sample from the Example and Comparative Examples. A sensory evaluation was conducted, with each subject assigned a score of 5 points, and the total scores of the 10 subjects were evaluated according to the following criteria. 5 points: Very effective cleaning 4 points: High cleaning effect 3 points: Somewhat effective in cleaning 2 points: Slightly poor cleaning effect 1 point: Very poor cleaning effect ◎: Total score of 10 people is 40-50 points ○: Total score of 10 people is 30-39 points △: Total score of 10 people is 20-29 points ×: Total score of 10 people is 0-19 points

[0040] <Appearance> Approximately 30 g of each sample from the examples and comparative examples was left at 40°C and 75% RH for three months, after which the condition was judged by visual observation. ◎: No change ○: Almost no change △: Slightly discolored ×: Clearly discolored

[0041] <Smell> Approximately 30 g of each sample from the examples and comparative examples was left at 40°C and 75% RH for three months, after which the condition was judged by sensory evaluation. ◎: No change ○: Almost no change △: Slightly sweet smell ×: A distinctly sweet smell was detected

[0042] Powdery skin cleansers were prepared according to the formulations shown in Tables 1 and 2 below (Examples 1 to 12, Comparative Examples 1 to 10), and their usability and stability were evaluated according to the above-mentioned evaluation criteria. The results are shown in Tables 1 and 2.

[0043] [Table 1]

[0044] [Table 2]

[0045] Example 13 Powdery skin cleansing agents were prepared according to the formulations in Table 3 below and the manufacturing methods of Examples 1 to 12 and Comparative Examples 1 to 10.

[0046] [Table 3]

[0047] The product names of the ingredient numbers in the table are as follows: #1: Amirite GCS-11 (Ajinomoto Co., Ltd.) #2: Amirite GCK-11 (Ajinomoto Co., Ltd.) #3: Aminoformer FLMS-P1 (Asahi Kasei Corporation) #4: Diapon K-SF Powder (NOF Corporation) #5: NIKKOL-LMT (Nikko Chemical Co., Ltd.) #6: Amisoft CS-11 (Ajinomoto Co., Ltd.) #7: Nonsal MK-1 (NOF Corporation) #8: Talc JA-80R (Asada Flour Milling Co., Ltd.) #9: Sericite FSE (Sanshin Mining Co., Ltd.) #10: Amycol C (Nippon Starch Chemical Co., Ltd.) #11: Ceolus PH-102 (Asahi Kasei) #12: Titanium oxide CR-50 (Ishihara Sangyo Co., Ltd.) #13: Purified papain (Mitsubishi Chemical Foods) #14: Dipotassium glycyrrhizinate (Maruzen Pharmaceuticals) #15: Pharmacopoeial D-mannitol (Kao Corporation) #16: Sorbitol (Kao Corporation) #17: Maltitol (Mitsubishi Corporation Foods) #18: Glycerin (Sakamoto Pharmaceutical Co., Ltd.) #19: Diglycerin 801 (Sakamoto Pharmaceutical Co., Ltd.) #20: Trehalose for cosmetics (Hayashibara Publishing) #21: Amycol No. 7-H (Nippon Starch Chemical Co., Ltd.) #22: Amycol No. 6-H (Nippon Starch Chemical Co., Ltd.) #23: Amycol No.1 (Nippon Starch Chemical Co., Ltd.) #24: Amycol No. 3-L (Nippon Starch Chemical Co., Ltd.) #25: Metrolose 60SH-50 (Shin-Etsu Chemical) #26:HPC-L (Nippon Sodasha) #27: Kimika Arginine I-1 (Kimika Co., Ltd.) #29: Eldew PS-203 (Ajinomoto Co., Ltd.) #30:Lipidure-PMB (NOF Corporation) The purified water in ingredient 28 evaporates and disappears during the granulation and drying processes.

[0048] As is clear from Tables 1 and 2, the powdered skin cleanser of the present invention had good solubility in water during use, foamed well, produced firm foam, and provided sufficient cleansing effects. It was also shown to have excellent stability over time. On the other hand, the powdery skin cleanser of the comparative example did not achieve good results in terms of both ease of use and stability. Therefore, it is clear that the powdery skin cleanser of the present invention has excellent effects.

[0049] The powdered skin cleanser thus obtained was filled and packaged in 300 blister packs of 0.5 g each using an automatic blister pack filling and packaging machine, yielding a sealed packaged powdered skin cleanser. The packages thus obtained had little variation in mass, and there was no problem of poor sealing due to fine powder remaining in the sealed area (poor sealing due to pinching). This is also thought to be an effect resulting from the high granulation properties of the powdered skin cleanser obtained by the method of the present invention. [Industrial Applicability]

[0050] The powdery skin cleanser of the present invention can be suitably used in the field of skin cleansers.

Claims

1. Contains the following (a), (b), (c), and (d): (a) N-acylglycine salt and / or N-acylaspartate (b) N-acylmethyltaurine salt (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol (d) Dextrin containing 10% or less reducing sugars A powdery skin cleanser characterized in that the content of component (a) is 3 to 40 mass% based on the total amount of the powdery skin cleanser, and the content of component (d) is 1 to 20 mass% based on the total amount of the powdery skin cleanser.

2. 2. The powdery skin cleanser according to claim 1, wherein the content of component (b) N-acylmethyl taurine salt is 1 to 10% by mass based on the total mass of the powdery skin cleanser.

3. 3. The powdery skin cleanser according to claim 1, wherein the content of the sugars and sugar alcohols as component (c) is 1 to 10% by mass based on the total mass of the powdery skin cleanser.

4. A method for producing a powdered skin cleanser, characterized by comprising a step of granulating a mixture containing the following (a), (b), (c), and (d) by a fluidized bed granulation method while spraying a polysaccharide-containing dispersion containing water onto the mixture: (a) N-acylglycine salt and / or N-acylaspartate salt: 3 to 40% by mass (b) N-acylmethyltaurine salt (c) one or more sugars and sugar alcohols selected from sucrose, maltose, trehalose, lactose, glycerin, erythritol, sorbitol, maltitol, xylitol, and mannitol (d) 1 to 20% by mass of dextrin having a reducing sugar content of 10% or less

5. 5. The method for producing a powdery skin cleanser according to claim 4, wherein the amount of the polysaccharide-containing dispersion containing water to be sprayed is 30 to 70% by mass based on the mixture.

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