Creamy skin cleanser

Abstract

To provide a cream-type skin cleanser that excels in lathering, foam elasticity, and foam density, leaves the skin feeling moisturized after rinsing, and has excellent long-term stability. [Solution] The present invention is a cream-type skin cleanser characterized by containing component (A) a sucrose fatty acid ester composed of straight-chain fatty acids having 12 to 18 carbon atoms, component (B) (b1) myristic acid and (b2) palmitic acid, component (C) phytosteryl / octyldodecyl lauroyl glutamate 0.01 to 2.0% by weight, component (D) sorbitol 0.07 to 7.0% by weight, and component (E) polyhydric alcohol (excluding component (D)) 10.0 to 30.0% by weight, with the total content of component (B) being 20 to 50% by weight.

Description

Technical Field

[0001] The present invention aims to provide a creamy skin cleanser that is excellent in foaming, foam elasticity, and foam density, imparts a moist feeling to the skin after rinsing, and has excellent stability over time.

Background Art

[0002] Skin cleansers are used to remove excess sebum and dirt and keep the skin healthy. Among them, creamy skin cleansers are widely marketed as skin cleansers. Many creamy skin cleansers mainly contain fatty acid soaps such as potassium salts of higher fatty acids, and a creamy dosage form can be obtained by combining fatty acids having 12 to 22 carbon atoms.

[0003] When using the above creamy skin cleanser, if washing is performed with insufficient foaming, friction on the skin may occur, which may burden the skin, and furthermore, it takes time to rinse, so consumers are demanding a creamy skin cleanser with high foaming power. In order to obtain a creamy skin cleanser with high foaming power, fatty acids with a short carbon number such as lauric acid are often used, but creamy skin cleansers containing a large amount of lauric acid have problems such as poor foam quality and instability over time.

[0004] Furthermore, characteristics of fatty acid soaps include a dry feeling and a tight feeling after washing, but consumers whose skin is prone to drying etc. are demanding a moist feeling after washing.

[0005] As a specific attempt to solve this problem, a cleanser having a higher fatty acid salt, quince seed extract, and lysine diacyl glutamate (Patent Document 1) is disclosed. Also, as a method for providing a cleanser having a moisturizing feeling and good foam quality, a technique containing a higher fatty acid and its salt and polyglyceryl-10 decaisostearate (Patent Document 2) is disclosed, but in both cases, the effects are insufficient and the problems have not been solved.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-13393 [Patent Document 2] Japanese Patent Publication No. 2022-6292 [Overview of the project] [Problems that the invention aims to solve]

[0007] The object of the present invention is to solve the above problems and provide a cream-type skin cleanser that is excellent in lathering, foam elasticity, and foam density, provides a moist feeling to the skin after rinsing, and has excellent stability over time. [Means for solving the problem]

[0008] In other words, the present invention comprises the following components (A) to (E): (A) Sucrose fatty acid esters composed of straight-chain saturated fatty acids with 12 to 18 carbon atoms (B)(b1) Myristic acid and (b2) Palmitic acid (C) Lauroyl glutamate di(phytosteryl / octyldodecyl) 0.01~2.0% by weight (D) Sorbitol 0.07-7.0% by weight (E) Polyhydric alcohols (excluding component (D)) 10.0-30.0% by weight The present invention provides a cream-type skin cleansing agent that contains and is characterized in that the content of component (B) is 20 to 50% by weight.

[0009] Furthermore, the present invention provides a cream-type skin cleansing agent characterized by containing 0.01 to 5.0% by weight of component (A).

[0010] Furthermore, the present invention provides a cream-type skin cleansing composition characterized in that the weight ratio [b2 / b1] of (b1) and (b2) in component (B) is 0.1 to 1.0. [Effects of the Invention]

[0011] The cream-type skin cleanser of the present invention is excellent in lathering, foam elasticity, and foam density, provides a moist feeling to the skin after rinsing, and has excellent stability over time. [Best Mode for Carrying Out the Invention]

[0012] In the present invention, component (A), a sucrose fatty acid ester composed of a straight-chain saturated fatty acid having 12 to 18 carbon atoms, includes, for example, sucrose laurate, sucrose myristate, sucrose palmitate, and sucrose stearate. These components may be used individually or in combination of two or more. Among these, sucrose laurate is preferred for its excellent lathering ability and moisturizing effect on the skin after rinsing. Commercially available sucrose fatty acid esters composed of straight-chain saturated fatty acids having 12 to 18 carbon atoms can be used, with examples including Surfhope SE COSME C-1216, Surfhope SE COSME C-1816, and Surfhope SE COSME C-1616 from Mitsubishi Chemical Corporation.

[0013] The content of component (A), a sucrose fatty acid ester composed of straight-chain saturated fatty acids with 12 to 18 carbon atoms, is preferably 0.01 to 5.0% by weight, and more preferably 0.1 to 2.0% by weight. When the content of component (A) is within this range, a cream-type skin cleanser with superior lathering, foam elasticity, and foam density can be obtained.

[0014] In the present invention, the total content of components (B)(b1) myristic acid and (b2) palmitic acid is 20 to 50% by weight, with 30 to 40% by weight being more preferable. If it is less than 20% by weight, the elasticity and density of the foam may be insufficient, and if it exceeds 50% by weight, the foaming may be poor. Furthermore, the weight ratio [b2 / b1] of (b1) myristic acid and (b2) palmitic acid in component (B) is not particularly limited, but it is preferably 0.1 to 1.0. When [b2 / b1] is within this range, a cream-type skin cleanser with superior foaming, foam elasticity, and density can be obtained. Fatty acids can be commercially available products, and examples include myristic acid #98 and palmitic acid #98 manufactured by Miyoshi Oil & Fat Co., Ltd.

[0015] In this invention, component (C) lauroyl glutamate di(phytosteryl / octyldodecyl) is a diester of lauroyl glutamate and a mixture of phytosterol and octyldodecanol. A commercially available product is "Plandool-LG2" (manufactured by Nippon Seika Co., Ltd.).

[0016] The content of ingredient (C) dilauroyl glutamate (phytosteryl / octyldodecyl) is 0.01 to 2.0% by weight, with 0.1 to 1.0% by weight being more preferable. If the content of ingredient (C) is less than 0.01% by weight, the moisturizing effect on the skin after washing may be impaired. On the other hand, if the content exceeds 2.0% by weight, lathering may be poor or the stability over time may be compromised.

[0017] Component (D), sorbitol, is a monosaccharide sugar alcohol produced from glucose. Commercially available products include "Sorbit D-70" (70% sorbitol aqueous solution) (manufactured by Mitsubishi Corporation Life Sciences Co., Ltd.).

[0018] The content of component (D) sorbitol in the present invention is 0.07 to 7.0% by weight, and more preferably 1.4 to 4.2% by weight. When the content of component (D) is less than 0.07% by weight, the elasticity of the foam and the moist feeling after washing may be impaired. On the other hand, when the content exceeds 7.0% by weight, the foaming property may deteriorate or the stability over time may deteriorate.

[0019] Component (E) polyhydric alcohol (excluding component (D)) in the present invention is not particularly limited. For example, glycerin, diglycerin, polyglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, methyl gluceth-20, etc. can be mentioned. These components may be used alone or in combination of two or more.

[0020] Among the above-mentioned component (E) polyhydric alcohol (excluding component (D)), it is particularly preferable to use glycerin, diglycerin, dipropylene glycol, polyethylene glycol and methyl gluceth-20.

[0021] Also, the content of component (E) polyhydric alcohol (excluding component (D)) is 10.0 to 30.0% by weight, and more preferably 15 to 25% by weight. When the content of component (E) is less than 10.0% by weight, the elasticity of the foam may become insufficient or the moist feeling of the skin after washing may be impaired. On the other hand, when the content exceeds 30.0% by weight, the density of the foam may be impaired or the stability over time may deteriorate.

[0022] Furthermore, the cream-type skin cleansing agent of the present invention can appropriately contain various components such as pigments, fragrances, chelating agents, higher alcohols, anti-inflammatory agents such as dipotassium glycyrrhizinate, gloss imparting agents, and water-soluble and oil-soluble components according to the use purpose within the range not impairing the effects of the invention.

Examples

[0023] The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples. The content is expressed in weight percent.

[0024] Creamy skin cleansing agents with the compositions listed in Tables 1-5 below were prepared, and a panel of 20 female professionals evaluated their lathering ability, foam elasticity, foam density, and the moisturizing effect on the skin after washing. In addition, the long-term stability of the creamy skin cleansing agents was evaluated, and the results are shown in Tables 1-5.

[0025] (Preparation method) Components a to c were heated and dissolved at 70 to 75°C, the mixture of component d was added to components a to c to neutralize it, then components e to j were added, and the mixture was cooled to 30°C to obtain a cream-type skin cleanser.

[0026] (Evaluation method) The following criteria were used to define "foaming." A panel of 20 female experts evaluated the lathering ability of cream-type skin cleansers on a two-point scale ("good" or "bad") according to the following criteria. ◎: More than 18 people rated it as having good lathering properties. 〇: 14-17 people rated it as having good lathering properties. △: 9 to 13 people rated it as having good foaming properties. ×: Fewer than 8 people rated it as having good lathering.

[0027] The following criteria were used to define "bubble elasticity." A panel of 20 female experts evaluated the elasticity of the foam produced when lathering cream-type skin cleansers, using a two-point scale of "present" or "absent," according to the following criteria. ◎: More than 18 people rated the foam as having good elasticity. 〇: 14-17 people rated the foam as having good elasticity. △: 9 to 13 people rated the foam as having good elasticity. ×: Fewer than 8 people rated the foam as having good elasticity.

[0028] The "density of the foam" was determined according to the following criteria. A panel of 20 female experts evaluated the foam produced when lathering cream-type skin cleansers, classifying it into two categories: "dense" and "not dense," and assessed it according to the following criteria. ◎: More than 18 people rated the foam as dense. 〇: 14-17 people rated the foam as dense. △: 9 to 13 people rated the foam as dense. ×: Fewer than 8 people rated the foam as dense.

[0029] The following criteria were used to define "how moisturized the skin feels after washing." A panel of 20 female experts evaluated the moisturizing effect on the skin after washing on a two-point scale: "yes" or "no," according to the following criteria. ◎: More than 18 people rated it as having a moisturizing feel. 〇: 14-17 people rated it as having a moisturizing feel. △: 9 to 13 people rated it as having a moisturizing feel. ×: Fewer than 8 people rated it as having a moisturizing effect.

[0030] (Method for evaluating stability over time) The cream-type skin cleansing agents for each example and comparative example were filled into 5mm diameter tube containers and stored in a 40°C constant temperature bath for 4 weeks. After storage, their "stability over time" was evaluated. The evaluation criteria were as follows: [Evaluation of stability over time] ◎: No water seepage or increase in water hardness; good condition. ×: There was water seepage and an increase in water hardness.

[0031] [Table 1] *1: Surfhope SE COSME C-1216 (manufactured by Mitsubishi Chemical Corporation) *2: Surfhope SE COSME C-1416 (manufactured by Mitsubishi Chemical Corporation) *3: Surfhope SE COSME C-1616 (manufactured by Mitsubishi Chemical Corporation) *4: Ryoto Sugar Ester LWA-1695 (manufactured by Mitsubishi Chemical Corporation) *5: Myristic acid #98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *6: Palmitic acid #98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *7: Ayacol EGS-MV (manufactured by Seiwa Kasei Co., Ltd.) *8: Potassium hydroxide (manufactured by Tokyo Ohka Kogyo Co., Ltd.) *9: Plandool LG-2 (manufactured by Nippon Seika Co., Ltd.) *10: Sorbitol D-70 (70% sorbitol aqueous solution) (manufactured by Mitsubishi Corporation Life Sciences Co., Ltd.) *11: Glycerin RG-Co-P (manufactured by NOF Corporation) *12: PEG #1500 (manufactured by NOF Corporation) *13: Jordapon CI LA Powder (manufactured by BASF Japan) *14: Anphorex LB-2 (manufactured by Miyoshi Oil & Fat Co., Ltd.)

[0032] As shown in Table 1, Examples 1 to 11, which are embodiments of the present invention, performed well in all evaluated items. On the other hand, as shown in Comparative Example 1, when sucrose oleate was used instead of sucrose fatty acid ester composed of straight-chain saturated fatty acids with 12 to 18 carbon atoms, satisfactory results were not obtained in terms of foaming and foam elasticity. Also, as shown in Comparative Example 2, when neither component (A) was contained, satisfactory results were not obtained in terms of foam elasticity and foam density.

[0033] [Table 2]

[0034] As shown in Table 2, in Examples 12 to 20, which are embodiments of the present invention, satisfactory results were obtained in all evaluated items. On the other hand, as shown in Comparative Example 3, when the total content of component (B) was less than 20% by weight, satisfactory results were not obtained in the items of foam elasticity and foam density. Also, as shown in Comparative Example 4, when the total content of component (B) exceeded 50% by weight, satisfactory results were not obtained in the item of foaming.

[0035] [Table 3] *15: Plandool LG-1 (manufactured by Nippon Seika Co., Ltd.)

[0036] As shown in Table 3, in Examples 21-25, which are embodiments of the present invention, satisfactory results were obtained in all evaluated items. On the other hand, as shown in Comparative Example 5, when the content of component (C) was less than 0.01% by weight, satisfactory results were not obtained in the item of skin moisture after washing. As shown in Comparative Example 6, when the content of component (C) exceeded 2.0% by weight, satisfactory results were not obtained in the items of foaming and stability over time. Furthermore, when component (C) was not contained, as in Comparative Example 7, satisfactory results were not obtained in the items of foam elasticity, foam density, and skin moisture after washing. As shown in Comparative Example 8, when lauroyl glutamate di(octyldodecyl / phytosteryl / behenyl) was contained instead of component (C), satisfactory results were not obtained in the items of foaming and skin moisture after washing.

[0037] [Table 4] *16: D-mannitol (manufactured by Kao Corporation) *17: Xylitol (manufactured by Mitsubishi Corporation Life Sciences Co., Ltd.)

[0038] As shown in Table 4, in Examples 26-29, which are embodiments of the present invention, satisfactory results were obtained in all evaluated items. On the other hand, as shown in Comparative Example 9, when the content of component (D) sorbitol was less than 0.07% by weight, satisfactory results were not obtained in the items of foam elasticity and skin moisturizing effect after washing. Furthermore, as shown in Comparative Example 10, when the content of component (D) sorbitol exceeded 7.0% by weight, satisfactory results were not obtained in the items of foaming and stability over time. In addition, as shown in Comparative Examples 11-13, when mannitol or xylitol were included instead of component (D) sorbitol, or when component (D) was not included, satisfactory results were not obtained in the items of foam elasticity, foam density, and skin moisturizing effect after washing.

[0039] [Table 5]

[0040] As shown in Table 5, in Examples 30-33, which are embodiments of the present invention, satisfactory results were obtained in all evaluated items. On the other hand, as shown in Comparative Example 14, when the total content of component (E) polyhydric alcohols (excluding component (D)) was less than 10% by weight, satisfactory results were not obtained in terms of foam elasticity and the moist feeling of the skin after washing. Also, as shown in Comparative Example 15, when the total content of component (E) exceeded 30% by weight, satisfactory results were not obtained in terms of foam density and stability over time.

[0041] Other embodiments of the present invention are shown below. The creamy skin cleansing compositions of Examples 34 to 36 received an "◎" rating in all evaluation items, including "lathering," "foam elasticity," "foam density," "skin moisturizing effect after washing," and "long-term stability."

[0042] (Example 34: Creamy skin cleanser) (Ingredients) (Weight%) 1. Sucrose laurate *1 2.0 2. Myristic acid*5 25.0 3. Palmitic acid*6 10.0 4. Glycol stearate*7 1.0 5. Hydroxypropyl starch phosphate *16 0.5 6. Oryzanol*17 0.5 7. Tetrasodium edetate *18 0.1 8.Purified water remainder 9. Potassium hydroxide *8 7.0 10. Lauroyl glutamate di(phytosteryl / octyldodecyl) *9 0.5 11. 70% sorbitol aqueous solution *10 5.0 12. Diglycerin *19 15.0 13. PEG-6, PEG-32 *12 2.0 14. Sodium Cocoyl Isethionate *13 3.0 15. Lauramidopropyl betaine *14 2.0 16.Fragrance (appropriate amount) (Preparation method) Components 1-7 are heated to 70-75°C, a mixture of components 8 and 9 is added to neutralize it, then components 10-16 are added and the mixture is cooled to 30°C. *16: STRUCTURE XL (manufactured by AkzoNobel) *17: Oryza Gamma V (manufactured by Oryza Oil & Fat Co., Ltd.) *18: Crewatt T (manufactured by Sankyo Kasei Co., Ltd.) *19: Diglycerin S (manufactured by Sakamoto Pharmaceutical Co., Ltd.)

[0043] (Example 35: Creamy skin cleanser) (Ingredients) (Weight%) 1. Sucrose laurate *1 2.0 2. Lauric acid*20 1.0 3. Myristic acid*5 20.0 4. Palmitic acid*6 10.0 5. Glycol stearate*7 1.0 6. Hydroxypropyl starch phosphate *16 0.5 7. Oryzanol*17 0.5 8. Sodium polyphosphate *21 0.1 9.Purified water remainder 10. Potassium hydroxide *8 7.0 11. Lauroyl glutamate di(phytosteryl / octyldodecyl) *9 0.5 12. 70% sorbitol aqueous solution *10 5.0 13. Diglycerin *19 10.0 14. Methyl Gluceth-20 *22 2.0 15. Dipropylene glycol *23 5.0 16. Sodium Lauroyl Methylalanine*24 2.0 17. Lauramidopropyl betaine *14 2.0 18.Fragrance (appropriate amount) (Preparation method) Heat components 1-8 to 70-75°C, add the mixture of components 9 and 10 to neutralize, then add components 11-18 and cool to 30°C. *20: Lauric acid #98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *21: Sodium polyphosphate (manufactured by Kanto Chemical Co., Ltd.) *22: GLUCAM(TM) E-20 HUMECTANT (manufactured by Lubrizol Japan Co., Ltd.) *23: DPG-FC (manufactured by AGC Corporation) *24: Al-Anon ALE (manufactured by Kawaken Fine Chemical Co., Ltd.)

[0044] (Example 36: Creamy skin cleanser) (Ingredients) (Weight%) 1. Sucrose palmitate*3 2.0 2. Myristic acid*5 20.0 3. Palmitic acid*6 10.0 4. Glycol stearate*7 1.0 5. Hydroxypropyl starch phosphate *16 0.5 6. Oryzanol*17 0.5 7. Sodium polyphosphate *21 0.1 8.Purified water remainder 9. Potassium hydroxide *8 7.0 10. Lauroyl glutamate di(phytosteryl / octyldodecyl) *9 0.5 11. 70% sorbitol aqueous solution *10 5.0 12. Diglycerin *19 5.0 13. Methyl Gluceth-20 *22 5.0 14. Dipropylene glycol *23 5.0 15. Polyglyceryl-10 Laurate *25 0.5 16. Sodium trehalose octenyl succinate *26 0.3 17. Sodium Lauroyl Methylalanine*24 2.0 18. Lauramidopropyl betaine *14 2.0 19.Fragrance (appropriate amount) (Preparation method) Heat components 1-7 to 70-75°C, add the mixture of components 8 and 9 to neutralize, then add components 10-19 and cool to 30°C. *25: NIKKOL Decaglyn 1-L (manufactured by Nikko Chemicals Co., Ltd.) *26: Trehalose AN (manufactured by JTS Corporation) [Industrial applicability]

[0045] According to the present invention, it is possible to provide a cream-type skin cleanser that has excellent lathering properties, good foam elasticity and density, leaves the skin feeling moisturized after washing, and has excellent long-term stability.

Claims

1. The following ingredients (A) to (E): (A) Sucrose fatty acid esters composed of straight-chain saturated fatty acids with 12 to 18 carbon atoms. (B) (b1) Myristic acid and (b2) Palmitic acid (C) Lauroyl glutamate di(phytosteryl / octyldodecyl) 0.01-2.0% by weight (D) Sorbitol 0.07-7.0% by weight (E) Polyhydric alcohols (excluding component (D)) 10.0 to 30.0% by weight A cream-type skin cleanser characterized by containing the above, wherein the total content of component (B) is 20 to 50% by weight.

2. The cream-type skin cleanser according to claim 1, characterized by containing 0.01 to 5.0% by weight of component (A).

3. The creamy skin cleansing composition according to claim 1 or 2, characterized in that the weight ratio [b2 / b1] of (b1) and (b2) in component (B) is 0.1 to 1.0.

Images