Creamy skin cleanser

Abstract

To provide a cream-type skin cleanser that has excellent water compatibility, lathering ability, and high-temperature stability, and leaves the skin feeling moisturized after rinsing without causing tightness. [Solution] The following components (A) to (D) (A) (a1) Lauric acid, (a2) Myristic acid, (a3) ​​Palmitic acid, and (a4) Stearic acid (B) Polyethylene glycol with an average degree of polymerization of 75 or higher (C) Sucrose fatty acid esters with HLB 10 or higher (D) Glycerin This is a cream-type skin cleansing agent characterized by containing the following: the weight ratio of component (a4) to component (a2) [a4 / a2] is 0.2 to 0.5, the content of component (A) is 25 to 45% by weight, the content of component (B) is 0.5 to 4.0% by weight, the content of component (C) is 0.5 to 5.0% by weight, and the content of component (D) is 15 to 30% by weight.

Description

Technical Field

[0001] The present invention relates to a cream-type skin cleanser that is excellent in water affinity, foaming ability, and high-temperature stability, and provides a moist after-wash feeling without giving a tight feeling to the skin after rinsing.

Background Art

[0002] Skin cleansers are used to remove excess sebum and dirt and keep the skin healthy. Among them, in recent years, cream-type skin cleansers have been widely used as skin cleansers. Cream-type skin cleansers generally contain fatty acid soaps such as potassium salts of higher fatty acids as the main component, and a cream-like dosage form can be obtained by combining fatty acids having 12 to 22 carbon atoms.

[0003] When using a cream-type skin cleanser, the water affinity greatly affects the ease of foaming. If the water affinity is poor, it takes time to foam, and the cream remains on the skin, making rinsing troublesome. Therefore, there is a need to develop a cream-type skin cleanser with good water affinity and excellent foaming properties. Generally, in order to improve the foaming properties, it is desirable to contain a large amount of lauric acid having a small number of carbon atoms. However, a cream-type skin cleanser containing a large amount of lauric acid has problems in terms of usability such as a strong tight feeling after rinsing, and also has problems in terms of high-temperature stability such as changing from a cream state to a liquid state or separating the aqueous component (bleeding) at high temperatures.

[0004] Furthermore, in recent years, there are many consumers who seek a moist feeling of the skin after rinsing even in skin cleansers, and the development of cleansers with a moisturizing effect has also been carried out.

[0005] Various approaches have been taken to address these challenges. For example, a skin cleansing composition containing a surfactant and an amphiphilic ester with a pH of 3-8 has been proposed as a cleanser that reduces the feeling of tightness (Patent Document 1). In addition, a cream-type cleansing composition containing a fatty acid salt with 12-18 carbon atoms, hydroxypropyl starch phosphate, a polyhydric alcohol with 4-6 carbon atoms, and glycerin has been proposed as a cleanser with excellent foaming properties, skin feel after washing, and stability over time (Patent Document 2). However, further improvements in usability and other aspects are still needed compared to conventional cleansers. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2021-4200 [Patent Document 2] Patent No. 5673116 [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 has excellent water compatibility, lathering ability, and high-temperature stability, and leaves the skin feeling moisturized after rinsing without causing tightness. [Means for solving the problem]

[0008] In other words, the present invention relates to the following components (A) to (D) (A) (a1) Lauric acid, (a2) Myristic acid, (a3) ​​Palmitic acid, and (a4) Stearic acid (B) Polyethylene glycol with an average degree of polymerization of 75 or higher (C) Sucrose fatty acid esters with HLB 10 or higher (D) Glycerin The present invention provides a cream-type skin cleansing agent characterized by containing the following: the weight ratio of component (a4) to component (a2) [a4 / a2] is 0.2 to 0.5, the content of component (A) is 25 to 45% by weight, the content of component (B) is 0.5 to 4.0% by weight, the content of component (C) is 0.5 to 5.0% by weight, and the content of component (D) is 15 to 30% by weight.

[0009] Furthermore, the present invention provides a cream-type skin cleansing composition characterized in that component (B) is PEG-150 and / or PEG-240.

[0010] Furthermore, the present invention provides a cream-type skin cleansing agent characterized in that component (C) is sucrose laurate. [Effects of the Invention]

[0011] The cream-type skin cleanser of the present invention is excellent in water compatibility, lathering ability, and high-temperature stability, and provides a moist finish without leaving the skin feeling tight after rinsing. [Best Mode for Carrying Out the Invention]

[0012] The content of component (A) of the present invention is 25 to 45% by weight relative to the cream-type skin cleanser, with 30 to 40% by weight being more preferable. If the content of component (A) is less than 25% by weight, foaming and high-temperature stability may be poor, and if it exceeds 45% by weight, water compatibility may be poor, or the skin may feel tight after rinsing.

[0013] The weight ratio of component (a4) to component (a2) of the present invention, [a4 / a2], is 0.2 to 0.5, with 0.3 to 0.4 being more preferable. If the weight ratio [a4 / a2] is less than 0.2, the moisturizing effect after rinsing may be insufficient, or the high-temperature stability may be poor. On the other hand, if the weight ratio [a4 / a2] exceeds 0.5, water compatibility and lathering may be poor.

[0014] Component (A) of the present invention is a straight-chain fatty acid having 12 to 18 carbon atoms, and the cream-type skin cleanser of the present invention contains all four components: (a1), (a2), (a3), and (a4). If any one of (a1) to (a4) is not included, foaming and high-temperature stability may be poor. Commercially available fatty acids can be used, and examples include lauric acid 98, myristic acid 98, and palmitic acid 98 manufactured by Miyoshi Oil & Fat Co., Ltd., and NAA-1865 manufactured by NOF Corporation.

[0015] The content of component (B) of the present invention, polyethylene glycol with an average degree of polymerization of 75 or higher, is 0.5 to 4.0% by weight relative to the cream-type skin cleanser, and more preferably 1.0 to 3.0% by weight. If the content of component (B) is less than 0.5% by weight, the moisturizing effect after rinsing may be insufficient, and if it exceeds 4.0% by weight, water compatibility may be poor.

[0016] The polyethylene glycol component (B) of the present invention, with an average degree of polymerization of 75 or higher, is not particularly limited, but examples include PEG-75, PEG-150, PEG-240, PEG-400, etc., and two or more types may be included in combination. Among these, PEG-150 with an average degree of polymerization of 150 and / or PEG-240 with an average degree of polymerization of 240 are preferred in terms of excellent water compatibility and moist feeling after rinsing. Commercially available polyethylene glycols with an average degree of polymerization of 75 or higher can be used, and examples include PEG#4000, PEG#6000, PEG#11000, and PEG#20000 manufactured by NOF Corporation.

[0017] The content of component (C) of the present invention, which is a sucrose fatty acid ester with an HLB of 10 or higher, is 0.5 to 5.0% by weight relative to the cream-type skin cleanser, and more preferably 1.0 to 3.0% by weight. If the content of component (C) is less than 0.5% by weight, water compatibility and lathering may be poor, and if it exceeds 5.0% by weight, the skin may feel tight after rinsing, or high-temperature stability may be poor.

[0018] Component (C) of the present invention, the sucrose fatty acid ester with an HLB of 10 or more is not particularly limited, and examples include sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, etc., and two or more kinds may be contained in combination. Among these, sucrose laurate is preferable in terms of excellent water affinity, foaming property, and the feeling of tightness after rinsing. It is possible to use commercially available products for the sucrose fatty acid ester with an HLB of 10 or more, and examples include Surfhope SE COSME C-1216, Surfhope SE COSME C-1816 manufactured by Mitsubishi Chemical Corporation, and Ryoto Sugar Ester S-1170.

[0019] Incidentally, the HLB value is usually the balance of hydrophilicity and hydrophobicity used in the field of surfactants, and calculation formulas commonly used, such as the Griffin, Davis, Kawakami formula, organic concept map, etc. can be used. Also, the HLB numerical values described in catalogs, etc. may be used.

[0020] The content of component (D) glycerin in the cream-type skin cleanser is 15 to 30% by weight, and more preferably 20 to 26% by weight with respect to the cream-type skin cleanser.If the content of component (D) is less than 15% by weight, the moist feeling after rinsing may be insufficient or the high-temperature stability may deteriorate. If it exceeds 30% by weight, the foaming property may deteriorate. It is possible to use commercially available products for glycerin, and glycerin RG·co·P manufactured by NOF Corporation is cited as an example.

[0021] The cream-type skin cleanser of the present invention may contain, in addition to the above components, fats and oils, waxes, hydrocarbons, lower alcohols, higher alcohols, surfactants, polyhydric alcohols, ultraviolet absorbers, pigments, fragrances, chelating agents, bactericides, preservatives, antioxidants, cooling agents, vitamins, scrub agents, pH adjusters, plant extracts, etc., as long as the effects of the invention are not impaired, according to the purpose of use.

Examples

[0022] The present invention will be described in more detail below with reference to examples. The present invention is not limited by these examples. Unless otherwise specified, the content is in weight %.

[0023] The creamy skin cleansers shown in Tables 1 to 4 were prepared by the following method. (Preparation method) Components 1 to 6 were heated at 75°C, the mixture of Components 7 and 8 and Components 9 and 10 were added, and the mixture was cooled to 30°C.

[0024] (Evaluation method of usability) Twenty professional panelists evaluated the "water affinity", "foaming ability", "tight feeling after rinsing", and "moist feeling after rinsing" when using each creamy skin cleanser. The evaluation was carried out in two levels: "good" or "bad" for "water affinity" and "foaming ability", and "present" or "absent" for "tight feeling after rinsing" and "moist feeling after rinsing". The evaluation criteria are as follows. [Evaluation of water affinity] ◎: 16 or more panelists evaluated that the water affinity was good. ○: 11 to 15 panelists evaluated that the water affinity was good. △: 6 to 10 panelists evaluated that the water affinity was good. ×: Less than 5 panelists evaluated that the water affinity was good. [Evaluation of foaming ability] ◎: 16 or more panelists evaluated that the foaming ability was good. ○: 11 to 15 panelists evaluated that the foaming ability was good. △: 6 to 10 panelists evaluated that the foaming ability was good. ×: Less than 5 panelists evaluated that the foaming ability was good. [Evaluation of tight feeling after rinsing] ◎: 16 or more panelists evaluated that there was no tight feeling after rinsing. ○: 11 to 15 panelists evaluated that there was no tight feeling after rinsing. △: 6 to 10 panelists evaluated that there was no tight feeling after rinsing. ×: Less than 5 panelists evaluated that there was no tight feeling after rinsing. [Evaluation of moisturizing effect after rinsing] ◎: More than 16 people rated it as leaving their skin feeling moisturized after rinsing. ○: 11-15 people rated the product as leaving their skin feeling moisturized after rinsing. △: 6-10 people rated it as leaving their skin feeling moisturized after rinsing. ×: Fewer than 5 people rated the product as leaving their skin feeling moisturized after rinsing. (High-temperature stability evaluation method) Each cream-type skin cleanser, filled into a 5mm diameter tube container, was stored in a 40°C constant temperature bath for 4 weeks, and then its "high-temperature stability" was evaluated. The evaluation criteria were as follows: [Evaluation of high-temperature stability] ◎: No water leakage or increase in water hardness; good condition. ×: There was water leakage and an increase in water hardness.

[0025] [Table 1] *1: Lauric acid 98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *2: Myristic acid 98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *3: Palmitic acid 98 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *4: NAA-1865 (manufactured by NOF Corporation) *5: Ayacol EGS-MV (manufactured by Seiwa Kasei Co., Ltd.) *6: Potassium hydroxide (manufactured by Tokyo Ohka Kogyo Co., Ltd.) *7: PEG #6000 (manufactured by NOF Corporation) *8: Surfhope SE COSME C-1216 (manufactured by Mitsubishi Chemical Corporation) *9: Glycerin RG-Co-P (manufactured by NOF Corporation) *10: Al-Anon ALE (manufactured by Kawaken Fine Chemical Co., Ltd.)

[0026] In Examples 1-9 of Table 1, satisfactory results were obtained in all evaluated items. Among these, as shown in Examples 2, 3, 4, 7, and 8, higher evaluations were obtained when the total amount of component (A) was 30-40% by weight, or when the weight ratio [a4 / a2] was 0.3-0.4. On the other hand, as shown in Comparative Example 1, when component (a1) was not included, satisfactory results were not obtained in terms of foaming. As shown in Comparative Examples 2-4, when any one of components (a2), (a3), or (a4) was not included, satisfactory results were not obtained in terms of high-temperature stability, etc. Furthermore, as shown in Comparative Example 5, when the content of component (A) was less than 25% by weight, satisfactory results were not obtained in terms of foaming and high-temperature stability. As shown in Comparative Example 6, when the content of component (A) exceeded 45% by weight, satisfactory results were not obtained in terms of water absorption and tightness after rinsing. Furthermore, as shown in Comparative Example 7, when the weight ratio of component (a2) to component (a4) [a4 / a2] was less than 0.2, satisfactory results were not obtained in terms of moisturizing effect after rinsing and high-temperature stability. Also, as shown in Comparative Example 8, when the weight ratio of component (a2) to component (a4) [a4 / a2] was greater than 0.5, satisfactory results were not obtained in terms of water compatibility and lathering.

[0027] [Table 2] *11: PEG #4000 (manufactured by NOF Corporation) *12: PEG #11000 (manufactured by NOF Corporation) *13: PEG #24000 (manufactured by NOF Corporation) *14: PEG #1000 (manufactured by NOF Corporation) *15: PEG #1500 (manufactured by NOF Corporation)

[0028] In Examples 10-16 of Table 2, satisfactory results were obtained for all evaluated items. Among these, as shown in Examples 11 and 12, higher evaluations were obtained when the content of component (B) was 1.0-3.0% by weight. Furthermore, as shown in Examples 11, 14, 15, and 16, higher evaluations were obtained when component (B) contained PEG-150 or PEG-240. On the other hand, as shown in Comparative Examples 9 and 10, when polyethylene glycol with an average degree of polymerization of 75 or higher was not contained or the content was less than 0.5% by weight, satisfactory results were not obtained in terms of moisturizing after rinsing. Furthermore, as shown in Comparative Example 11, when the content of polyethylene glycol with an average degree of polymerization of 75 or higher exceeded 4.0% by weight, satisfactory results were not obtained in terms of water compatibility. Furthermore, as shown in Comparative Examples 12 and 13, when polyethylene glycol with an average degree of polymerization of less than 75 was contained instead of polyethylene glycol with an average degree of polymerization of 75 or higher, satisfactory results were not obtained in terms of tightness or moisturizing after rinsing.

[0029] [Table 3] *16: Surfhope SE COSME C-1816 (manufactured by Mitsubishi Chemical Corporation) *17: Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Corporation) *18: Surf Hope SE COSME C-1205 (manufactured by Mitsubishi Chemical Corporation) *19: NIKKOL HCO-60 (manufactured by Nikko Chemicals Co., Ltd.)

[0030] In Examples 17-22 of Table 3, satisfactory results were obtained for all evaluated items. Among these, as shown in Examples 18 and 19, higher evaluations were obtained when the content of component (C) was 1.0-3.0% by weight. Furthermore, as shown in Examples 18, 21, and 22, higher evaluations were obtained when sucrose laurate was included among the components (C). On the other hand, as shown in Comparative Examples 14 and 15, when sucrose fatty acid esters with an HLB of 10 or higher were not included or the content was less than 0.5% by weight, satisfactory results were not obtained in terms of water compatibility and lathering. Furthermore, as shown in Comparative Example 16, when the content of sucrose fatty acid esters with an HLB of 10 or higher exceeded 5% by weight, satisfactory results were not obtained in terms of tightness after rinsing and high-temperature stability. Furthermore, as shown in Comparative Example 17, when sucrose dilaurate, a sucrose fatty acid ester with an HLB of less than 10, was included, satisfactory results were not obtained in terms of water compatibility, lathering, and high-temperature stability. Furthermore, as shown in Comparative Example 18, when PEG-60 hydrogenated castor oil (HLB:14) was included, satisfactory results were not obtained in terms of foaming and high-temperature stability.

[0031] [Table 4]

[0032] In Examples 23-26 of Table 4, satisfactory results were obtained for all evaluated items. Among these, as shown in Examples 24 and 25, higher evaluations were obtained when the content of component (D) was 20-26% by weight. On the other hand, as shown in Comparative Examples 19 and 20, when glycerin was not contained or contained less than 15% by weight, satisfactory results were not obtained in terms of moisturizing effect after rinsing and high-temperature stability. Furthermore, as shown in Comparative Example 21, when the glycerin content exceeded 30% by weight, satisfactory results were not obtained in terms of lathering. Also, as shown in Comparative Example 22, when BG was used instead of glycerin, satisfactory results were not obtained in terms of lathering and high-temperature stability.

[0033] Other embodiments of the present invention are shown below. The creamy skin cleansing compositions of Examples 27 to 31 received an "◎" rating in all evaluation items, including "water compatibility," "lathering," "tightness after rinsing," "moisturizing effect after rinsing," and "high-temperature stability."

[0034] (Example 27: Cream-type facial cleanser) (Ingredients) (Weight%) 1. Lauric acid*1 4.0 2. Myristic acid*2 20.0 3. Palmitic acid*3 9.0 4. Stearic acid*4 7.0 5. Glycol stearate*5 1.0 6. Dipotassium glycyrrhizinate 0.1 7. Sodium tocopheryl phosphate 0.1 8. Sucrose laurate *8 1.5 9. Glycerin *9 20.0 10. Diglycerin 5.0 11. PEG-150*7 1.0 12. PEG-240 *12 1.0 13. Tetrasodium EDTA 0.2 14.Purified water remainder 15. Potassium hydroxide *6 7.9 16. Polyoxyethylene (20) methyl glucoside *20 1.0 17. Sodium Lauroyl Methylalanine*10 1.5 18. Lauramidopropyl betaine *21 5.0 19. Polyquaternium-7 *22 1.0 20. Plant extract (appropriate amount) 21.Fragrance (appropriate amount) (Preparation method) Components 1-13 were heated to 75°C, the mixture of components 14 and 15 and components 16-21 were added, and the mixture was cooled to 30°C. *20: GLUCAM(TM) E-20 HUMECTANT (manufactured by Lubrizol Japan Co., Ltd.) *21: Anphorex LB-2 (manufactured by Miyoshi Oil & Fat Co., Ltd.) *22: MERQUAT 550 (manufactured by Lubrizol Japan Co., Ltd.)

[0035] (Example 28: Cream-type facial cleanser) (Ingredients) (Weight%) 1. Lauric acid*1 1.0 2. Myristic acid*2 13.0 3. Palmitic acid*3 14.0 4. Stearic acid *4 4.5 5. Glycol stearate *5 1.5 6. Ceramide NG 0.001 7. Sodium hyaluronate 0.1 8. Sucrose laurate *8 1.0 9. Glycerin *9 22.0 10. Dipropylene glycol 5.0 11. PEG-75 *11 1.0 12. PEG-150*7 1.0 13. Tetrasodium EDTA 0.1 14.Purified water remainder 15. Potassium hydroxide *6 6.2 16. Polyglyceryl-10 Laurate *23 1.5 17. Sodium Cocoyl Methyl Taurate*24 5.0 18. Sodium Lauroyl Methylalanine*10 1.5 19. Lauramidopropyl betaine *21 5.0 20. Plant extract (appropriate amount) (Preparation method) Components 1-13 were heated to 75°C, a mixture of components 14 and 15 and components 16-20 were added, and the mixture was cooled to 30°C. *23: NIKKOL DECAGLYN 1-L (manufactured by Nikko Chemicals Co., Ltd.) *24: Diapon K-SF (manufactured by NOF Corporation)

[0036] (Example 29: Creamy body wash) (Ingredients) (Weight%) 1. Lauric acid*1 3.0 2. Myristic acid*2 22.0 3. Palmitic acid*3 6.0 4. Stearic acid*4 7.0 5. Glycol distearate*25 2.0 6. Sucrose laurate *8 1.2 7. Sucrose stearate *16 0.6 8. Glycerin*9 20.0 9.PG 7.0 10. PEG-150*7 1.5 11. PEG-400 *13 0.3 12. Sodium polyphosphate 0.1 13.Purified water remainder 14. Potassium hydroxide *6 7.5 15. Lauramidopropyl betaine *21 16.0 16.Fragrance (appropriate amount) (Preparation method) Components 1-12 were heated to 75°C, the mixture of components 13 and 14 and components 15 and 16 were added, and the mixture was cooled to 30°C. *25: SP Sysroll EGDS MBAL-PA-(SG) (manufactured by Croda)

[0037] (Example 30: Cream-type facial cleanser) (Ingredients) (Weight%) 1. Lauric acid*1 1.0 2. Myristic acid*2 20.0 3. Palmitic acid*3 6.8 4. Stearic acid *4 7.2 5. Glycol stearate*5 1.0 6. Sucrose laurate *8 3.0 7. Glycerin*9 26.0 8. PEG-75 *11 1.5 9. PEG-150*7 1.0 10. Tetrasodium EDTA 0.1 11.Purified water remainder 12. Potassium hydroxide *6 5.7 13. Lauramidopropyl betaine *21 5.0 14. Plant extract (appropriate amount) 15.Fragrance (appropriate amount) (Preparation method) Components 1-10 were heated to 75°C, a mixture of components 11 and 12 and components 13-15 were added, and the mixture was cooled to 30°C.

[0038] (Example 31: Cream-type facial cleanser) (Ingredients) (Weight%) 1. Lauric acid*1 1.0 2. Myristic acid*2 20.0 3. Palmitic acid*3 6.8 4. Stearic acid *4 7.2 5. Glycol stearate*5 1.0 6. Sucrose laurate *8 3.0 7. Glycerin*9 21.0 8. PEG-150 *7 1.5 9. Tetrasodium EDTA 0.1 10.Purified water remainder 11. Potassium hydroxide *6 7.7 12. Sodium Lauroyl Methylalanine*10 1.5 13.Fragrance (appropriate amount) (Preparation method) Components 1-9 were heated to 75°C, a mixture of components 10 and 11 and components 12 and 13 were added, and the mixture was cooled to 30°C. [Industrial applicability]

[0039] According to the present invention, a cream-type skin cleanser is obtained that has excellent water compatibility, foaming ability, and high-temperature stability, and leaves the skin feeling moisturized after rinsing without causing tightness.

Claims

1. The following components (A) to (D) (A) (a1) Lauric acid, (a2) Myristic acid, (a3) ​​Palmitic acid and (a4) Stearic acid (B) Polyethylene glycol with an average degree of polymerization of 75 or higher (C) Sucrose fatty acid esters with an HLB of 10 or higher (D) Glycerin A cream-type skin cleansing agent characterized by containing the following: the weight ratio of component (a4) to component (a2) [a4 / a2] is 0.2 to 0.5, the content of component (A) is 25 to 45% by weight, the content of component (B) is 0.5 to 4.0% by weight, the content of component (C) is 0.5 to 5.0% by weight, and the content of component (D) is 15 to 30% by weight.

2. The cream-type skin cleanser according to claim 1, characterized in that component (B) is PEG-150 and / or PEG-240.

3. The cream-type skin cleanser according to claim 1 or 2, characterized in that component (C) is sucrose laurate.

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