JP7760263B2 - Cosmetic powder composition and cosmetics containing the same - Google Patents

Description

The present invention relates to a cosmetic powder composition and a cosmetic product containing the same.

Technology is being developed to powder surfactants for use as cosmetic ingredients. Known methods for powdering surfactants include direct grinding and using trehalose, long-chain polymers such as dextrin and cornstarch, or known polymers as excipients. When liquid surfactants are powdered using excipients, problems arise, such as stickiness after processing, poor fluidity, and leakage of the liquid over time.
However, it has been reported that surfactants that are liquid at room temperature are suitable for use in cosmetics due to their extremely high detergency and foaming power (Patent Document 1). However, as mentioned above, there are problems with powdering such surfactants, and therefore a technology for powdering liquid surfactants has been desired.

Japanese Patent Application Publication No. 10-218759

The present invention was made to solve the above problems, and aims to provide a cosmetic powder composition that is easy to use and has a good feel when used.

As a result of intensive research to solve the above problems, the present inventors have found that by preparing a powder composition for cosmetics containing a specific galactomannan degradation product and a surfactant, it is possible to improve the feel of cosmetics on the skin, improve the foam quality of body cleansers and the like, and maintain moisturizing effects, and have basically completed the present invention.
When surfactants that are liquid at room temperature (e.g., 35°C) are combined, the stickiness inherent to surfactants remains, and therefore, an excipient must be used for powderization. However, when known excipients such as dextrin, cornstarch, and trehalose are used as excipients, the powder has poor fluidity and is difficult to handle. In addition, they tend to adhere to manufacturing equipment, resulting in poor operability and low yield. In addition, there are usability problems, such as difficulty in improving foam quality, improving skin feel, and moisturizing functions when used in cosmetics.

The present inventors have discovered that combining a surfactant with a galactomannan hydrolysate reduces the stickiness inherent to surfactants and produces a powder that is easy to pulverize and has high fluidity. They have also discovered that combining a galactomannan hydrolysate with a surfactant can dramatically improve the effects of improving foam quality, improving skin feel, and moisturizing function, leading to the present invention.
Thus, the cosmetic powder composition according to the present invention is characterized by containing a surfactant and a galactomannan degradation product.
In this case, the average molecular weight of the galactomannan degradation product is preferably 5,000 to 30,000.

The surfactant is preferably a glycerin fatty acid ester, and more preferably a polyglycerin fatty acid ester.
The surfactant is preferably a polyglycerol fatty acid ester that is non-solid at 35°C. In this case, the constituent fatty acids of the polyglycerol fatty acid ester preferably contain at least one selected from the group consisting of lauric acid, myristic acid, and oleic acid, and more preferably contain lauric acid. Furthermore, the monoester content of the polyglycerol fatty acid ester is preferably 30% or more, more preferably 70% or more. Examples of non-solid states include liquid, paste, and slurry.
With regard to the mixing ratio of (A) the galactomannan degradation product and (B) the polyglycerol fatty acid ester, it is more preferable that (B) is 60% by mass or less. In this case, (B) is preferably 5% or more, and more preferably 10% or more. With such a configuration, the stickiness characteristic of surfactants is suppressed, powderization is easy, a powder with high fluidity is obtained, and the surfactant foams well and dissolves easily.
The mixing ratio of the cosmetic powder composition is preferably (A) the galactomannan degradation product:(B) the polyglycerin fatty acid ester = 40:60 to 99:1, more preferably 1:1 to 9:1. A composition with this mixing ratio can be diluted before use.
Furthermore, a cosmetic product according to another invention contains the above-mentioned powder composition for cosmetics, or this powder composition can be used as a cosmetic product.

The cosmetic powder composition of the present invention is a powder that dramatically enhances the cleansing power and foaming power that are characteristic of surfactants, and because it is a powder with high fluidity, it can be suitably incorporated not only into liquid cosmetics but also into powder cosmetics. Furthermore, by using the cosmetic powder composition of the present invention in cosmetics, it is possible to improve foam quality, improve skin feel, and enhance moisturizing functions, etc.

1 is a graph of a calibration curve showing the relationship between retention time (minutes) and the logarithmic value of a molecular weight marker when HPLC analysis of a galactomannan degradation product is performed.

Next, embodiments of the present invention will be described with reference to the drawings. The technical scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.
The galactomannan degradation products of the present invention are substances obtained by decomposing guar gum, locust bean gum, tara gum, and the like, which are extracts obtained from naturally occurring raw materials such as guar beans. The degradation method is not particularly limited, and examples include known degradation treatment methods such as enzymatic degradation, acid degradation, alkaline degradation, and high-pressure treatment degradation. However, to adjust the molecular weight, an enzymatic treatment method is preferably used.
The average molecular weight of the galactomannan degradation product in the present invention is preferably 5,000 to 30,000 from the viewpoint of functionality such as improved moisturizing properties, good skin feel, and improved foam quality. The molecular weight of the galactomannan degradation product can be measured using high performance liquid chromatography (column: TSKgel SuperAW (Tosoh)) and a differential refractometer (RI).

The above functionality can be further enhanced by combining the galactomannan degradation product with a surfactant.
The type of surfactant that can be used in the present invention is preferably a surfactant that is non-solid at 35° C. Surfactants that are solid at 35° C. can be powdered by pulverization, but when applied to cosmetics, the effects of improving foam quality, improving skin feel, and moisturizing function are insufficient.
Examples of surfactants include nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, polyglycerin fatty acid ethers, polyoxyethylene glycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, and polyoxyethylene sorbitol fatty acid esters; fatty acid salts, alkyl sulfates, alkylbenzene sulfonates, polyoxyethylene alkyl ether sulfates, polyoxyethylene fatty acid amine sulfates, polyoxyethylene alkylphenyl ether sulfates, polyoxyethylene alkyl ether phosphates, and α-sulfonated fatty acid alkyl esters. Examples of surfactants that can be used include anionic surfactants such as quaternary ammonium salts, primary to tertiary fatty acid amine salts, trialkylbenzylammonium salts, alkylpyridinium salts, 2-alkyl-1-alkyl-1-hydroxyethylimidazolinium salts, N,N-dialkylmorpholinium salts, and polyethylenepolyamine fatty acid amide salts; and amphoteric surfactants such as N,N-dimethyl-N-alkyl-N-carboxymethylammoniobetaine, N,N,N-trialkyl-N-alkyleneammoniocarboxybetaine, and N-acylamidopropyl-N',N'-dimethyl-N'-β-hydroxypropylammoniosulfobetaine. Of these, polyglycerin fatty acid esters are more preferred because of their pleasant feel on the skin after application.

In the polyglycerol fatty acid ester of the present invention, the degree of polymerization of the hydrophilic group, polyglycerol, is preferably 5 or more, more preferably 10-15.
Fatty acids that can be suitably used range from caprylic acid (carbon number: C8) to behenic acid (carbon number: C22). However, from the viewpoint of cleansing power and foaming power, lauric acid (carbon number: C12), myristic acid (carbon number: C14), and oleic acid (carbon number: C18) are preferred, with lauric acid being more preferred.
The composition of the polyglycerol mono-fatty acid ester used in the present invention can be analyzed by HPLC using a reversed-phase partition column, under the following conditions: Wacosil 5C182 column, methanol as the developing solvent, a flow rate of 0.75 ml/min, a column temperature of 40°C, UV absorption at 210 nm as the detection method, a sample concentration of 10% (solvent: methanol), and an injection volume of 5 ml.
The synthesis method can be, but is not limited to, addition polymerization of glycidol to a fatty acid. From the viewpoint of detergency and foaming power, the monoester content is preferably 30% or more, and more preferably 70% or more.

The method for preparing the cosmetic powder composition is not particularly limited, but known powdering methods such as spray drying using a spray dryer, drum drying, freeze drying using freeze drying, granulation, coating, etc. can be used.
The method for preparing the cosmetic powder composition of the present invention is not particularly limited, but examples include a method in which a galactomannan degradation product and a surfactant are mixed in advance and powdered, and the powder is added, or a method in which a galactomannan degradation product and a surfactant are added separately to the cosmetic product. In these cases, the above-mentioned configuration can also be adopted.

The cosmetic composition of the present invention is preferably in powder form.
Other ingredients that may be blended into the cosmetic powder composition and cosmetics of the present invention include oils such as hydrocarbon liquid oils, animal and vegetable oils, ester oils, etc. Preservatives include paraben, ethylparaben, methylparaben, propylparaben, butylparaben, potassium sorbate, sodium sorbate, sorbic acid, sodium dehydroacetate, hydrogen peroxide, formic acid, ethyl formate, sodium dichlorite, propionic acid, sodium propionate, calcium propionate, pectin hydrolysate, polylysine, phenol, isopropylmethylphenol, o-phenylphenol, phenoxyethanol, resorcinol, dibutylhydroxytoluene (BHT), thymol, thiram, tea tree oil, hinokitiol, etc.

In addition, anionic and nonionic polymers can be blended as feel improvers and thickeners to adjust viscosity and improve usability, provided that the effects of the present invention are not impaired. Examples of such components include the following. Examples of anionic polymers include, but are not limited to, acrylic acid derivatives (polyacrylic acid and its salts, acrylic acid/acrylamide/ethyl acrylate copolymers and their salts, etc.), methacrylic acid derivatives (polymethacrylic acid and its salts, methacrylic acid/acrylamide/diacetoneacrylamide/acrylic acid alkyl ester/methacrylic acid alkyl ester copolymers and their salts, etc.), crotonic acid derivatives (vinyl acetate/crotonic acid copolymers, etc.), maleic acid derivatives (maleic anhydride/diisobutylene copolymers, isobutylene/maleic acid copolymers, etc.), polyglutamic acid and its salts, hyaluronic acid and its salts, carboxymethyl cellulose, carboxyvinyl polymers, etc.

The nonionic polymer is not particularly limited, but examples thereof include acrylic acid derivatives (hydroxyethyl acrylate-methoxyethyl acrylate copolymer, polyacrylic acid amide, etc.), vinylpyrrolidone derivatives (polyvinylpyrrolidone, vinylpyrrolidone-vinyl acetate copolymer, etc.), polyoxyalkylene glycol derivatives (polyethylene glycol, polypropylene glycol, etc.), cellulose derivatives (methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, etc.), polysaccharides and their derivatives (guar gum, locust bean gum, dextran, etc.), etc.
Other examples include fragrances, ultraviolet absorbers, visible light absorbers, chelating agents, antioxidants, colorants, pH adjusters, viscosity adjusters, pearlescent agents, humectants, extracts derived from plants and animals, polyphenols, amino acids, salts, carotenoids, etc. Other ingredients that are commonly used in cosmetics can also be used.

The cosmetics in the product of the present invention are not particularly limited, but examples thereof include basic cosmetics such as emulsions, creams, lotions, essences, packs, and facial cleansers; makeup cosmetics such as lipstick, foundation, liquid foundation, and makeup press powder; hair cosmetics such as hair shampoo, hair rinse, hair treatment, conditioner, hair dye, and hair styling products; cleansing cosmetics such as cleansers, facial cleansers, body shampoos, and soaps; and bath additives.
The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

<Preparation Example 1>
900 g of water was adjusted to pH 3 with 0.1 N hydrochloric acid, and 0.15 g of β-mannanase derived from Aspergillus bacteria (Novo Nordisk Bioindustry) and 100 g of guar gum powder (Taiyo Kagaku Co., Ltd.) were added and mixed, followed by enzymatic hydrolysis of guar gum at 50-55°C for 24 hours. After the reaction, the enzyme was inactivated by heating at 90°C for 15 minutes. After filtration (suction filtration) to remove insoluble matter, the guar gum hydrolyzate was subjected to size exclusion chromatography (Tosoh Corporation columns: TSKgel SuperOligoPW-N and TSKgel SuperMultiporePW-H) to remove low molecular weight fractions (molecular weight of approximately 500 or less) and high molecular weight fractions (molecular weight of approximately 47,000 or more). When performing size exclusion chromatography, pullulan (molecular weight: 47,300) and maltotriose (molecular weight: 504) were used as molecular weight markers.
The resulting solution was concentrated under reduced pressure (Yamato evaporator) and then dried using a spray dryer (Okawahara Kakoki Co., Ltd.) to obtain 54 g of guar gum decomposition product as a powder.

The molecular weight of the galactomannan degradation products was analyzed using high-performance liquid chromatography. An aqueous solution of the galactomannan degradation products (solid concentration: 1.0% (W/V)) was prepared as a sample solution, filtered, and then quantitatively analyzed by high-performance liquid chromatography under the following conditions.
HPLC (Shimadzu) analysis (HPLC conditions: column: TSKgel SuperAW 4000 (Tosoh) 6 mm × 150 mm + TSKgel SuperAW 2500 (Tosoh) 6 mm × 150 mm, detector: RI (differential refractometer), eluent: water (100%), flow rate: 0.3 mL/min, column temperature: 80°C, identification was performed using molecular weight markers (pullulan (molecular weight: 5,900, 11,800, 22,800, 47,300, 112,000, 212,000, 404,000, 788,000), mannose, maltotriose, maltoheptaose).
To calculate the average molecular weight, a calibration curve showing the relationship between retention time and molecular weight was prepared in advance as shown in FIG. 1 and used.

Of the finally obtained fractions, the fraction with an average molecular weight of 5,000 was designated galactomannan degradation product A, the fraction with an average molecular weight of 10,000 was designated galactomannan degradation product B, the fraction with an average molecular weight of 20,000 was designated galactomannan degradation product C, and the fraction with an average molecular weight of 30,000 was designated galactomannan degradation product D. Furthermore, the fraction with an average molecular weight of less than 5,000 was designated galactomannan degradation product E, and the fraction with an average molecular weight of 40,000 or more was designated galactomannan degradation product F.
Examples 1 to 32
Powder compositions were prepared based on the formulations in Table 1. Examples 1 to 32 were powder compositions prepared using galactomannan degradation products A to D and polyglycerol laurate (polyglycerol fatty acid ester) which is liquid at 35°C, has a monoester content of 73%, and is composed of polyglycerol with an average degree of polymerization of 10.

Examples 33 to 40
Powder compositions prepared using galactomannan degradation products E and F based on the formulations in Table 2 and polyglycerol laurate (polyglycerol fatty acid ester) which is liquid at 35°C, has a monoester content of 73%, and is composed of polyglycerol with an average degree of polymerization of 10 were designated as Examples 33 to 40.

Examples 41 to 56
Based on the formulations in Table 3, cosmetic powder compositions were prepared using galactomannan decomposition products A to D and polyglycerol laurate (polyglycerol fatty acid ester) which is liquid at 35°C, has a monoester content of 55%, and is composed of polyglycerol with an average degree of polymerization of 10. These compositions were designated as Examples 41 to 56.

Examples 57 and 58
Powder compositions prepared using galactomannan decomposition product C and a surfactant based on the formulation in Table 4 were designated Examples 57 and 58. Powder compositions prepared using galactomannan or dextrin and a surfactant instead of the galactomannan decomposition product were designated Comparative Examples 1 to 6. Furthermore, Comparative Example 7 contained only galactomannan decomposition product C, and Comparative Example 8 contained only a surfactant.
The surfactants used were polyglycerol laurate (polyglycerol fatty acid ester), which is liquid at 35°C and is composed of polyglycerol with a monoester content of 73% and an average degree of polymerization of 10; polyglycerol myristate (polyglycerol fatty acid ester), which is pasty at 35°C and is composed of polyglycerol with a monoester content of 39% and an average degree of polymerization of 10; and polyglycerol with a monoester content of 39% and an average degree of polymerization of 10, which is liquid at 35°C.

Test Example 1 Powder Properties The powder compositions prepared in Examples 1 to 58 and Comparative Examples 1 to 8 were evaluated for powder properties. The evaluation was conducted by scoring the results of a questionnaire administered to 10 sensory evaluation panelists. The evaluation items were "stickiness" and "fluidity."
Regarding "stickiness," the feel of the powder was evaluated, with the least sticky being given a score of 6 and the most sticky being given a score of 1. Furthermore, the absence of powdery texture was given a score of 0.
Regarding "fluidity," the powder state was evaluated, with the most fluid being given a score of 6 and the least fluid being given a score of 1. Furthermore, the product that did not become powdery was given a score of 0.
In each case, the final score was the average of the results of 10 panelists. The higher the score, the better the powder state, and a score of 4 or more indicates good. On the other hand, a score of less than 3 indicates unsuitable powder properties.
The results are shown in Table 5. As shown in Table 5, it was found that all of the Examples were good in terms of "stickiness" and "fluidity." In contrast, no Comparative Examples were found to be good in terms of either "stickiness" or "fluidity."

Test Example 2: Foam properties Foam properties were evaluated for the powder compositions of the Examples and Comparative Examples in Table 6. The evaluation was conducted by scoring the results of a questionnaire administered to 10 sensory evaluation panelists. The evaluation items were "foaming,""fineness of foam texture," and "maintenance of foam state."
Regarding "lathering,""fineness of lather," and "maintenance of lather state," sensory evaluation was performed by taking 1 g of each product and 3 g of water in the hand and lathering it with both hands in the palm of the hand for 20 seconds. Each evaluation was performed by 10 panelists. The average value of the responses was considered to be effective, and a score of 4 or more was deemed to be effective, while a score of less than 3 was deemed to be ineffective.
The "fineness of the foam texture" was visually observed immediately after foaming and rated on a 5-point scale, with the finest texture being given a score of 6 and the coarsest texture being given a score of 1. Furthermore, when no foam was produced, the score was 0.
Regarding "maintenance of foam state," the foam was visually observed 30 seconds after whipping and rated on a 5-point scale, with the best foam maintenance being given a score of 6 and the worst foam maintenance being given a score of 1. The results are shown in Table 6.

As shown in Table 6, it was found that the examples were good in all of "foaming,""fine foam texture," and "maintenance of foam state."
Based on the results in Tables 5 and 6, the evaluations for each example were totaled to give an overall evaluation, which is shown in Table 7.

Test Example 3: Lotion Lotions 1 to 20 were prepared according to the formulations shown in Table 8, by adding 2% by mass of the cosmetic powder composition prepared in the Examples.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the skin feel on a response sheet, rating it on a 6-point scale, with a score of 1 for the weakest perceived effect and a score of 6 for the strongest perceived effect. The average of the obtained scores was taken as the additive effect, and a score of 4 or more was considered to be effective. On the other hand, a score of less than 3 was considered to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated in three categories: "Feels smooth after application,""Feels moisturized after application," and "Feels good on the skin after application." The results are shown in Table 9.

As is clear from Table 9, when the product of the present invention was used in cosmetics, the skin felt smooth after application, the skin felt moisturized, and it was found to be well absorbed into the skin.

Test Example 4 Shampoo Shampoos 21 to 40 were prepared by adding 5% by mass of the cosmetic powder composition prepared in the Example according to the formulation shown in Table 10. In addition, shampoo 41 was prepared without adding any of the Example.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the skin feel on a response sheet, rating it on a 6-point scale, with a score of 1 for the weakest perceived effect and a score of 6 for the strongest perceived effect. The average of the obtained scores was taken as the additive effect, and a score of 4 or more was considered to be effective. On the other hand, a score of less than 3 was considered to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated based on four criteria: "fine foam texture,""elasticfoam,""foam does not decrease," and "moisturized after washing." The results are shown in Table 11.

As is clear from Table 11, when the product of the present invention is used in shampoo, the foam quality is improved, with fine, elastic foam and no loss of foam, and a moist feel is obtained after rinsing.

Test Example 5: Facial Cleansing Cream A
Facial cleansing creams A 42 to 61 were prepared using the formulations shown in Table 12, with 2% by mass of the cosmetic powder composition prepared in the Examples added.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the foam feel and skin feel on a response sheet, rating it on a 6-point scale, with 1 point representing the weakest perceived effect and 6 points representing the strongest perceived effect. The average of the obtained values was taken as the additive effect, and a value of 4 points or more was deemed to be effective. On the other hand, a value of less than 3 points was deemed to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated based on four criteria: "fine foam texture,""elasticfoam,""foam does not decrease," and "moisturized after washing." The results are shown in Table 13.

As is clear from Table 13, when the product of the present invention is used in a face wash cream, the foam quality is improved, with finer texture, elasticity, and the foam not decreasing, and a moist feeling is obtained after washing.

Test Example 6: Facial Cleansing Cream B
Facial cleansing creams B 1 to 8 were prepared by adding 3% by mass of the cosmetic powder composition prepared in the Examples according to the formulation shown in Table 14. In addition, an additive-free facial cleansing cream 9 was prepared without adding any of the Examples.
A questionnaire was conducted on "foam fineness" and "foam retention" using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation judgment on the feel of the foam on a response sheet, rating it on a 6-point scale, with 1 point representing the weakest perceived effect and 6 points representing the strongest perceived effect. The average of the obtained values was taken as the additive effect, and a value of 4 points or more was considered to be effective. On the other hand, a value of less than 4 points was considered to be ineffective. The results are shown in Table 15.

As is clear from Table 15, when the product of the present invention is used in a face wash cream, it is found that the foam has a fine texture and does not easily decrease.

Test Example 6: Beauty Cream A
Cosmetic Cream A Nos. 62 to 81 were prepared using the formulation shown in Table 16, with 4% by mass of the cosmetic powder composition prepared in the Examples added.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the skin feel on a response sheet, rating it on a 6-point scale, with a score of 1 for the weakest perceived effect and a score of 6 for the strongest perceived effect. The average of the obtained scores was taken as the additive effect, and a score of 4 or more was considered to be effective. On the other hand, a score of less than 3 was considered to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated based on three items: "Feels smooth after application,""Feels moisturized after application," and "Feels good on the skin after application." The results are shown in Table 17.

As is clear from Table 17, when the product of the present invention was used in beauty cream A, the skin felt smooth after application, the skin felt moisturized, and it was found to be well absorbed into the skin.

Test Example 7: Beauty Cream B
Cosmetic Cream B Nos. 82 to 101 were prepared using the formulations shown in Table 18, with 4% by mass of the cosmetic powder composition prepared in the Examples being added.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the skin feel on a response sheet, rating it on a 6-point scale, with a score of 1 for the weakest perceived effect and a score of 6 for the strongest perceived effect. The average of the obtained scores was taken as the additive effect, and a score of 4 or more was considered to be effective. On the other hand, a score of less than 3 was considered to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated in three categories: "Feels smooth after application,""Feels moisturized after application," and "Feels good on the skin after application." The results are shown in Table 19.

As is clear from Table 19, when the product of the present invention was used in beauty cream B, the skin felt smooth after application, the skin felt moisturized, and it was found to be well absorbed into the skin.

Test Example 8 Facial Cleansing Powders Facial cleansing powders 102 to 121 were prepared according to the formulations shown in Table 20, by adding 2% by mass of the cosmetic powder compositions prepared in the Examples.
A questionnaire was conducted using 10 sensory evaluation panelists. The panelists recorded their sensory evaluation of the skin feel on a response sheet, rating it on a 6-point scale, with 1 point representing the weakest perceived effect and 6 points representing the strongest perceived effect. The average of the obtained values was taken as the additive effect, and a value of 4 points or more was deemed to be effective. On the other hand, a value of less than 3 points was deemed to be ineffective. The sensory evaluation items were as follows:
The skin feel was evaluated based on four criteria: "fine foam texture,""elasticfoam,""foam does not decrease," and "moisturized skin after washing." The results are shown in Table 21.

As is clear from Table 21, when the product of the present invention is used in a face wash powder, the foam quality is improved, with finer texture, elasticity, and the foam not decreasing, and a moist feeling is obtained after washing.

Test Example 9 Cleansing Lotion Cleansing lotions 122 to 127 were prepared by adding 2% by mass of the cosmetic powder compositions prepared in the Examples and Comparative Examples according to the formulations shown in Table 22. In addition, cleansing lotion 128 was prepared without adding any of the Examples.
Waterproof mascara was applied to Bioskin and allowed to dry for at least two hours. Each cleansing lotion was then dropped onto the mascara and massaged with a finger 50 times. After rinsing with a weak water flow while gently massaging 10 times, photographs were taken before and after cleansing, and the degree of dirt removed per unit area was calculated using image analysis software as the "mascara removal rate (%)." The results are shown in Table 23.

As is clear from Table 23, when the product of the present invention was used in a cleansing lotion, it was found that the mascara removal rate was high and the cleansing power was improved. As such, the cosmetic powder composition of this embodiment is a powder that dramatically improves the cleaning power and foaming power that are characteristic of surfactants, and because it is a powder with high fluidity, it can be suitably incorporated not only into liquid cosmetics but also into powder cosmetics. Furthermore, by using this in cosmetics, it is possible to improve foam quality, improve skin feel, and enhance moisturizing functions, thereby providing products with improved skin care effects, usability, cleansing power, and cleansing power.

Claims (8)

A cosmetic powder composition containing a surfactant and a galactomannan degradation product , wherein the galactomannan degradation product has an average molecular weight of 5,000 to 30,000, the surfactant is a glycerin fatty acid ester, and the galactomannan degradation product is enzymatically hydrolyzed without undergoing a modification process. A cosmetic powder composition containing a surfactant and a galactomannan degradation product, wherein the galactomannan degradation product has an average molecular weight of 5,000 to 30,000, the surfactant is a glycerin fatty acid ester, and the galactomannan degradation product does not have a modifying group. 3. The cosmetic powder composition according to claim 1 , wherein the surfactant is a polyglycerol fatty acid ester that is non-solid at 35°C. 4. The cosmetic powder composition according to claim 3 , wherein the constituent fatty acids of the polyglycerin fatty acid ester contain at least one selected from the group consisting of lauric acid, myristic acid, and oleic acid. 5. The cosmetic powder composition according to claim 4 , wherein one of the constituent fatty acids of said polyglycerol fatty acid ester is lauric acid. 6. The cosmetic powder composition according to claim 3, wherein the content of monoesters in the polyglycerol fatty acid esters is 70% or more. 7. The cosmetic powder composition according to any one of claims 3 to 6 , wherein the mixing ratio of (A) the galactomannan degradation product to (B) the polyglycerin fatty acid ester is such that (B) is 60% by mass or less. A cosmetic product comprising the cosmetic powder composition according to any one of claims 1 to 7 .