Paste-type body cleansing agent composition

Abstract

To provide a pasty body washing composition that offers favorable use experience and lathering properties during the washing, can be stably stored in weakly acidic conditions in both low and high temperature ranges, and prevents foam from dripping during lathering.SOLUTION: A pasty body washing composition contains component (a): 1-15 mass% of acyl methyl-β-alanine with a C8-22 acyl group, component (b): 15-30 mass% of N-acylamino acid salt, and component (c): 50-70 mass% of a C2-4 polyhydric alcohol.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a paste-like body cleansing composition used for body cleansing.

Background Art

[0002] Conventionally, in cleansing compositions for body cleansing, those using soap as a main component have been widely used. Such cleansing compositions using soap are excellent in foaming and refreshing feeling, but have the following drawbacks: 1) strong irritation to the skin, 2) a rough feeling on the skin after rinsing, 3) a tight feeling after towel drying, 4) significant reduction in foaming and detergency in hard water. Therefore, as a cleansing component having a mild action on the skin, an anionic surfactant composed of N-acyl amino acid salt has attracted attention, and cleansing compositions containing this compound have been developed and proposed.

[0003] On the other hand, instead of liquid detergents that tend to drip and solid detergents that tend to dissolve and collapse, a paste-like or cream-like (hereinafter simply referred to as "paste-like") detergent that does not drip and can appropriately take out only the necessary amount at the time of use by filling it in a tube container or the like is preferred by consumers. Such a paste-like body cleansing composition is excellent in usability, but has problems with storage stability such that soap crystallizes in a low temperature range and becomes difficult to take out from a tube container or the like, or water separation occurs in a high temperature range.

[0004] As a means for solving these problems, for example, Patent Document 1 discloses a cleansing composition containing a salt of a fatty acid having 12 or more carbon atoms, N-acylmethyltaurine salt, polyoxyethylene alkyl ether, and monoglycerin fatty acid ester. In this cleansing composition, there is no tight feeling after towel drying, and it has excellent storage stability in a low temperature range and a high temperature range. However, since it is a weakly alkaline cleansing agent mainly composed of soap, it may be inferior in mildness to the skin.

[0005] As a means to solve the problems of the above-mentioned paste-like cleansing agent composition, which has soap as its main component and N-acyl amino acid salts added, a cleansing agent composition having N-acyl amino acid salts as its main component has been proposed. For example, Patent Document 2 discloses a cream-like cleansing agent composition containing N-acyl neutral amino acids and / or their salts, a highly polymerized polyol, and a polyhydric alcohol, exhibiting a pH ranging from weakly acidic to neutral. In this cleansing agent composition, setting the pH to weakly acidic to neutral makes it mild on the skin and provides excellent lathering, however, when N-methylated N-acyl neutral amino acid salts are used, it can become liquid and have poor storage stability.

[0006] Furthermore, Patent Document 3 discloses a creamy detergent composition mainly composed of N-long-chain potassium acyl glutamate, containing N-long-chain acyl neutral amino acids and / or their salts, polyhydric alcohols, and water in specific mass ratios, and exhibiting a specific pH. While this detergent composition exhibits excellent foaming and storage stability in the weakly acidic pH range of 5.6 to 5.9, in the weakly acidic range of pH 6 or higher, the solubility of acyl glutamate and acyl alanine salts in water increases, which can lead to syneresis or liquid formation, resulting in poor storage stability.

[0007] Furthermore, these detergent compositions need to be dissolved by adding water little by little when lathering them in the palm of the hand. However, the foam produced by N-acyl amino acid salts can sometimes drip due to its light weight and low foam viscosity, making it difficult to obtain a satisfactory amount of foam during use. Therefore, there is a need for a paste-type body cleansing agent composition that offers excellent usability and foaming properties during washing, as well as superior storage stability in low and high temperature ranges in a weakly acidic environment, and that suppresses foam dripping when lathered. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2002-155295 [Patent Document 2] Japanese Patent Publication No. 2000-143497 [Patent Document 3] Japanese Patent Publication No. 2009-067947 [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention aims to solve the above problems and provides a paste-like body cleansing composition that is excellent in terms of usability and foaming during washing, storage stability in low and high temperature ranges in a weakly acidic environment, and suppresses foam dripping when foaming. [Means for solving the problem]

[0010] In view of the above problems, the present inventors conducted diligent studies and found that the above problems can be solved by including acylmethyl-β-alanine, N-acyl amino acid salt, and polyhydric alcohol in specific proportions in a paste-type body cleansing composition, thus completing the present invention.

[0011] In other words, the present invention comprises: (a) 1 to 15% by mass of acylmethyl-β-alanine having an acyl group with 8 to 22 carbon atoms; (b) 15 to 30% by mass of an N-acyl amino acid salt; and (c) a polyhydric alcohol having 2 to 4 carbon atoms. 55 This is a paste-like body cleansing composition containing approximately 70% by mass. [Effects of the Invention]

[0012] The paste-like body cleansing composition of the present invention (hereinafter also simply referred to as "cleansing composition") provides excellent usability and foaming properties during washing, as well as superior storage stability in low and high temperature ranges in a weakly acidic environment, and an effect that suppresses foam dripping when lathering. In this invention, "body cleansing agent" refers to a cleansing agent for washing the body surface of various parts of the human body, specifically the head including the face, neck, torso, arms, and legs, and excludes hair cleansing agents for washing only hair. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below. Various modifications are possible without departing from the spirit of the present invention. In this specification, numerical ranges defined using the symbol "~" include the numbers at both ends (upper and lower limits) of "~". For example, "2~4" means 2 or greater and 4 or less.

[0014] The detergent composition of the present invention contains at least the following components (a), (b), and (c). Each component is described below. The content of each component is given when the total amount of the detergent composition of the present invention is 100% by mass.

[0015] <Ingredients (a)> The component (a) used in the present invention is acylmethyl-β-alanine having an acyl group with 8 to 22 carbon atoms. When an acyl group having 8 to 22 carbon atoms is denoted as "RCO-", R represents a hydrocarbon group having 7 to 21 carbon atoms, and the acyl group represents the portion of a fatty acid (RCOOH) from which the hydroxyl group has been removed. This acyl group (RCO-) may be either an acyl group derived from a saturated fatty acid or an acyl group derived from an unsaturated fatty acid, but an acyl group derived from a saturated fatty acid is preferred. Furthermore, the acyl group is not limited to an acyl group derived from one type of fatty acid, but may be an acyl group derived from a mixed fatty acid containing two or more types of fatty acids. Also, from the viewpoint of the effects of the present invention, it is preferable that this acyl group has 8 to 18 carbon atoms.

[0016] More specifically, examples of the acyl group having 8 to 22 carbon atoms include, for example, capryloyl group, caproyl group, lauroyl group, myristoyl group, palmitoyl group, stearoyl group, oleoyl group, linoleoyl group, linolenoyl group, arachidonoyl group, behenoyl group and the like. Further, a mixed acyl group in which two or more of these acyl groups are mixed may also be used, and examples thereof include mixed acyl groups such as coconut oil fatty acid acyl group and palm kernel oil fatty acid acyl group. Among them, lauroyl group, myristoyl group, coconut oil fatty acid acyl group, and palm kernel oil fatty acid acyl group are preferable, and lauroyl group, coconut oil fatty acid acyl group, and palm kernel oil fatty acid acyl group are more preferable.

[0017] Specific examples of component (a) include, for example, N-lauroyl-N-methyl-β-alanine, N-coconut oil fatty acid acyl-N-methyl-β-alanine and the like. In addition, as component (a), one or more acylmethyl-β-alanines can be used.

[0018] The lower limit of the content of component (a) is 1% by mass, preferably 3% by mass, more preferably 5% by mass. If the content of component (a) is too small, it may be inferior in the difficulty of dripping of foam during foaming and storage stability. The upper limit of the content of component (a) is 15% by mass, preferably 10% by mass. If the content of component (a) is too large, foaming may be inferior, and precipitation may occur during storage at low temperature, leaving a rough feeling. Examples of the range of the content of component (a) include, for example, 1 to 15% by mass, preferably 3 to 10% by mass, more preferably 5 to 10% by mass.

[0019] <Component (b)> Component (b) used in the present invention is an N-acyl amino acid salt. An N-acylamino acid salt refers to a compound in which an acyl group is bonded to an alkali salt of an amino acid. When this acyl group is denoted as "RCO-", R is preferably a hydrocarbon group having 7 to 21 carbon atoms, more preferably 7 to 17 carbon atoms, and the acyl group represents the portion of a fatty acid (RCOOH) from which the hydroxyl group has been removed. This acyl group (RCO-) may be either an acyl group derived from a saturated fatty acid or an acyl group derived from an unsaturated fatty acid, but an acyl group derived from a saturated fatty acid is preferred. Furthermore, the acyl group is not limited to an acyl group derived from one type of fatty acid, but may be an acyl group derived from a mixed fatty acid containing two or more types of fatty acids.

[0020] More specific examples of acyl groups include capryloyl, caproyl, lauroyl, myristoyl, palmitoyl, stearoyl, oleoyl, linoleoyl, linolenoyl, arachidinoyl, and behenoyl groups. Furthermore, mixed acyl groups, which are mixtures of two or more of these acyl groups, are also acceptable, such as mixed acyl groups like coconut oil fatty acid acyl groups and palm kernel oil fatty acid acyl groups. Among these, lauroyl, myristoyl, coconut oil fatty acid acyl, and palm kernel oil fatty acid acyl groups are preferred, and more preferably, lauroyl, coconut oil fatty acid acyl, and palm kernel oil fatty acid acyl groups.

[0021] Examples of N-acyl amino acid salts include N-acyl neutral amino acid salts such as N-acyl glycine salts, N-acyl sarcosine salts, N-acyl alanine salts, N-acyl-N-methyl-β-alanine salts, N-acyl-N-hydroxyethyl-β-alanine salts, and N-acyl-N-methyltaurine salts; N-acyl acidic amino acid salts such as N-acyl glutamate salts and N-acyl aspartate salts; and N-acyl basic amino acid salts such as N-acyl lysine salts and N-acyl arginine salts. Preferably, they are N-acyl neutral amino acid salts such as N-acyl glycine salts, N-acyl sarcosine salts, N-acyl alanine salts, N-acyl-N-methyl-β-alanine salts, N-acyl-N-hydroxyethyl-β-alanine salts, and N-acyl-N-methyltaurine salts, and more preferably N-acyl-N-hydroxyethyl-β-alanine salts and N-acyl-N-methyltaurine salts.

[0022] As the component (b), one or more N-acyl amino acid salts can be used, and it is particularly preferable to use two or more selected from N-acyl neutral amino acid salts. For example, combinations of N-acyl-N-hydroxyethyl-β-alanine salt and N-acyl-N-methyltaurine salt, and combinations of N-acyl-N-methyltaurine salt and N-acyl-N-methyl-β-alanine salt are preferable, and a combination of N-acyl-N-hydroxyethyl-β-alanine salt and N-acyl-N-methyltaurine salt is particularly preferable.

[0023] Examples of counterions forming N-acyl amino acid salts include alkali metal salts such as sodium and potassium; and organic amine salts such as monoethanolamine, diethanolamine, and triethanolamine. Preferably, they are sodium, potassium, and triethanolamine, and more preferably sodium.

[0024] Specific examples of component (b) include, for example, sodium methyl taurate, sodium N-lauroyl-N-methyl-β-alanine, sodium N-lauroyl-N-hydroxyethyl-β-alanine, and sodium N-coconut oil fatty acid acyl-N-hydroxyethyl-β-alanine.

[0025] The lower limit of the content of component (b) is 15% by mass, preferably 20% by mass. If the content of component (b) is too low, the foaming of the composition may be insufficient. The upper limit of the content of component (b) is 30% by mass, preferably 25% by mass. If the content of component (b) is too high, the hardness of the composition will increase due to storage at low temperatures, making it difficult to dispense from the container, or the foaming may be worse due to the slower water absorption of the paste-like composition. Examples of the range of content of component (b) include 15 to 30% by mass, preferably 20 to 25% by mass.

[0026] <Ingredient (c)> The component (c) used in the present invention is a polyhydric alcohol having 2 to 4 carbon atoms. Examples of polyhydric alcohols having 2 to 4 carbon atoms include glycerin, 1,3-butylene glycol, and propylene glycol. Among these, glycerin is preferred.

[0027] The lower limit of the content of component (c) is 50% by mass, preferably 55% by mass. If the content of component (c) is too low, the hardness of the composition may be insufficient when stored at high temperatures, resulting in poor storage stability. The upper limit of the content of component (c) is 70% by mass, preferably 65% ​​by mass. If the content of component (c) is too high, the hardness of the composition may increase when stored at low temperatures, making it difficult to dispense from the container. The range of the content of component (c) is, for example, 50 to 70% by mass, preferably 55 to 65% by mass.

[0028] The detergent composition of the present invention contains at least the above components (a), (b), and (c), and the total content of all components (a) to (c) is preferably 70 to 98% by mass, more preferably 75 to 95% by mass, and even more preferably 80 to 90% by mass.

[0029] <Water> The detergent composition of the present invention preferably further contains water in addition to the above components (a), (b), and (c). There are no particular restrictions on the water used, and distilled water, deionized water, tap water, etc., can be used. The water content is preferably 5 to 20% by mass, and more preferably 10 to 15% by mass, when the total amount of the detergent composition of the present invention is 100% by mass.

[0030] When a compound having an N-acylamino acid molecular structure contained in the detergent composition of the present invention is represented as (component (a) + component (b)), the molar mass ratio of the compound having an N-acylamino acid molecular structure to the N-acylamino acid salt contained in component (b) is preferably 1.1 to 2.1, and more preferably 1.2 to 1.5, from the viewpoint of foaming and storage stability. The molar mass ratio of the compound having the molecular structure of an N-acyl amino acid and the N-acyl amino acid salt contained in component (b) is calculated by the following formula. Furthermore, the molecular weight of each component is calculated by multiplying the molecular weight of each atom by its structural formula. Note that the number of carbon atoms in the acyl group refers to the average number of carbon atoms obtained by multiplying the number of carbon atoms in each group by their relative abundance and adding them together.

number

[0031] The detergent composition of the present invention may optionally contain various other components, provided that they do not impair the effects of the present invention. Examples of optional components include other surfactants, oils, water-soluble polymers, preservatives, disinfectants, pH adjusters, and other components commonly used in hair and body detergents. The content of these optional components is preferably 0 to 20% by mass, when the total amount of the detergent composition of the present invention is 100% by mass.

[0032] The detergent composition of the present invention can be manufactured according to known methods. For example, component (a), component (b), component (c), and other optional components as needed are added and adjusted with water so that the total volume of the composition is 100% by mass. Then, the mixture is stirred at 40-90°C and cooled slowly while stirring until it reaches 10-40°C to obtain the detergent composition of the present invention. [Examples]

[0033] The embodiments of the present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited thereto.

[0034] [Examples 1-7 and Comparative Examples 1-6] <Preparation of detergent composition> Components (a) to (c) in Tables 1 and 2, or component (a' in place of component (a) if applicable), and other components were sequentially added to water. The mixture was stirred at 80°C, and then cooled slowly with stirring until it reached 25°C to prepare the detergent compositions for Examples 1 to 7 and Comparative Examples 1 to 6. The ingredients in Tables 1 and 2 are those from commercially available cosmetic products. The content of each ingredient in the tables is expressed in mass percent.

[0035] For each of the detergent compositions obtained in Examples 1 to 7 and Comparative Examples 1 to 6, evaluations were carried out on "foaming", "feeling during use for washing", "dripping of foam during foaming", and "storage stability (5°C, 45°C)" as described in the following (1) to (5). Also, the pH of each detergent composition was measured by the following method. The pH of each detergent composition and the evaluation results of (1) to (5) are shown together in Table 1 and Table 2.

[0036] <pH Measurement Method> A 10% by mass aqueous solution of the detergent composition was prepared, and the pH at 25°C was measured using a pH meter ("F-52" manufactured by Horiba, Ltd.).

[0037] <Evaluation of Detergent Composition> (1) Foaming Twenty men and women (aged 24 to 40 years) were used as panelists. 1 g of the detergent composition was used to foam by hand, and the foaming was evaluated according to the following absolute evaluation criteria. The total score of each panelist's evaluation was obtained, and based on the total score of the evaluation, it was evaluated in four grades of "◎", "○", "△", and "×" according to the following evaluation criteria. When the evaluation was "◎" or "○", it was regarded as passing. 〔Absolute Evaluation Criteria〕 (Score): (Evaluation) 2 points: Felt that the foaming was good. 1 point: Felt that the foaming was slightly bad. 0 point: Clearly felt that the foaming was bad. 〔Four-Grade Evaluation by Total Score〕 ◎: Total score is 35 points or more ○: Total score is 30 points or more and less than 35 points △: Total score is 20 points or more and less than 30 points ×: Total score is less than 20 points

[0038] (2) Feeling during Use for Washing Twenty men and women (ages 24-40) served as panelists. They washed their faces using 1g of the cleansing agent composition and evaluated the user experience during washing according to the absolute evaluation criteria below. The total score of each panelist's evaluation was calculated, and based on the total score, a rating was given on a four-point scale of "◎", "○", "△", and "×" according to the evaluation criteria below. An evaluation of "◎" or "○" was considered a pass. [Absolute evaluation criteria] (Rating): (Evaluation) 2 points: I felt that it was comfortable to use during washing, without any squeaking or tightness. 1 point: I felt there was a slight creaking or tightness. 0 points: There was a noticeable squeaking or tight feeling, and I felt the user experience during washing was poor. [Four-level rating based on total score] ◎: Total score of 35 points or more ○: Total score between 30 and 35 points △: Total score is between 20 and 30 points. ×: Total score less than 20 points

[0039] (3) Foaming when whipping Two grams of the cleaning agent composition were placed in a 100 mL transparent glass container with a lid. Purified water was added to dilute it fivefold, then the lid was closed and the container was vigorously shaken up and down 30 times at 25°C to create foam. After that, it was allowed to stand for 1 minute to remove excess water, and the foam viscosity was measured at 25°C using a Type B viscometer (TVB-20L, manufactured by Toki Sangyo Co., Ltd.). Based on the measured foam viscosity, it was evaluated on a four-point scale of "◎", "○", "△", and "×" according to the evaluation criteria below. A rating of "◎" or "○" was considered a pass. [Evaluation Criteria] ◎: Foam viscosity is 1,000 mPa·s or higher ○: Foam viscosity is 500 mPa·s or higher, and less than 1,000 mPa·s. △: Foam viscosity is 100 mPa·s or more, but less than 500 mPa·s. ×: Foam viscosity is less than 100 mPa·s point

[0040] (4) Storage stability (5℃) 20 g of the cleaning agent composition was sealed in a tube container (inner diameter 7 mm) and stored in a constant temperature bath at 5°C for one month. After being removed from the constant temperature bath and left to stand overnight in a constant temperature bath at 25°C to return to room temperature, the cleaning agent composition was squeezed out of the tube container and evaluated on a four-point scale of "◎", "○", "△", and "×" according to the evaluation criteria below. A rating of "◎" or "○" was considered a pass. [Evaluation Criteria] ◎: It has a moderate firmness, making it easy to dispense from the tube, and it has a smooth, non-gritty texture. ○: Slightly firm, but can be removed from the tube, and has a smooth texture. △: Slightly hard, but can be removed from the tube, and has a rough texture. ×: It has hardened and cannot be easily removed from the tube, and has a rough texture.

[0041] (5) Storage stability (45℃) 20g of the detergent composition was sealed in a transparent glass container with a lid and stored in a constant temperature bath at 45°C for one month. Immediately after removing it from the constant temperature bath, the detergent composition was visually observed and evaluated on a four-point scale of "◎", "○", "△", and "×" according to the evaluation criteria below. A rating of "◎" or "○" was considered a pass. [Evaluation Criteria] ◎: It is a paste-like substance with no syneresis or separation, and has a uniform white appearance. ○: It is a paste-like consistency with no syneresis or separation, but there are some areas where the white color is slightly lighter. △: Slight syneresis is observed, resulting in a paste-like consistency with an uneven appearance. ×: Clearly separated from water, or in liquid form.

[0042] [Table 1]

[0043] [Table 2]

[0044] Examples 1-7 were satisfactory in all aspects. On the other hand, Comparative Example 1 had excellent foaming properties and a pleasant feel during washing, formed a soft paste with low hardness, and exhibited excellent storage stability at low temperatures. However, because it did not contain component (a), it produced foam loss when foamed and showed clear layering at high temperatures. Comparative Example 2 showed improved usability during washing by adjusting the pH of the detergent composition of Comparative Example 1 to a weakly acidic pH using an organic acid. However, the high amount of alkali salt introduced from component (b) resulted in high solubility of the N-acyl amino acid surfactant in water, leading to layer separation at high temperatures, insufficient storage stability, and insufficient suppression of foam dripping during lathering. Comparative Example 3 lacks component (a) and contains an excess of component (c), resulting in a high hardness of the detergent composition, making it difficult to dispense from the tube container, especially at low temperatures. Furthermore, it produces little foam when lathered and tends to quickly collapse into a liquid state, resulting in insufficient suppression of foam dripping during lathering.

[0045] Comparative Example 4, by containing an excess of component (b), exhibited excellent storage stability at high temperatures. However, the hardness of the detergent composition increased, making it difficult to dispense from the tube container, especially at low temperatures. Furthermore, it took time for the paste to mix with water, resulting in insufficient foaming. Comparative Example 5 contained an excessive amount of component (a), resulting in insufficient foaming. Furthermore, the hardness of the detergent composition increased during low-temperature storage, and component (a) precipitated, leaving a rough texture. Comparative Example 6 contains lauric acid as component (a') instead of component (a), resulting in excellent foaming. However, lauric acid precipitates during low-temperature storage, leaving a rough texture and insufficient storage stability at low temperatures. This results in a poor user experience during washing and insufficient suppression of foam dripping during lathering. [Industrial applicability]

[0046] The paste-like body cleansing composition of the present invention exhibits a weakly acidic pH, making it mild on the skin. It also offers excellent usability during washing, lathering, and storage stability in low and high temperature ranges at a weakly acidic pH. It can suppress foam dripping when lathering and can be used, for example, as a body shampoo, facial cleanser, or hand soap.

Claims

[Claim 1] Component (a): 1 to 15% by mass of acylmethyl-β-alanine having an acyl group with 8 to 22 carbon atoms, Ingredient (b): 15-30% by mass of N-acyl amino acid salt Component (c): 55-70% by mass of polyhydric alcohols with 2-4 carbon atoms A paste-like body cleansing composition containing this agent.

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