Body cleansing composition

Abstract

To provide a body washing composition mainly composed of a fatty acid salt, which is excellent in foam retentivity when washing the skin coated with cosmetics containing a large amount of an oil-based component and spreadability of its foam and also can give the skin smoothness even in a dry environment.SOLUTION: A body washing composition contains a component (a): a taurine derivative of acyl methyl glycine represented by a formula (1) of 0.1-15 mass%, a component (b): a C8-22 fatty acid salt of 5-40 mass%, and a component (c): a C3-6 divalent-tetravalent alcohol of 1-20 mass%, with a mass ratio of the component (b) to the component (a), (b) / (a), of 2-80. (In the formula (1), R1CO is a C8-22 acyl group, M1 is an alkali metal atom, 1 / 2 alkaline-earth metal atom, an organic ammonium or a basic amino acid).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to body cleansing compositions such as body soap, hand soap, and facial cleanser.

Background Art

[0002] Since fatty acid salts have both excellent foam quality and detergency, they have been used as a main component of body cleansing compositions for a long time, and even today when various surfactants have become popular, they are suitably used as a main component in body cleansing compositions.

[0003] On the other hand, body cleansing compositions using fatty acid salts have a problem that the foaming property decreases when used on the skin coated with cosmetics containing a large amount of oily components such as body cream and sunscreen. Regarding this problem, for example, Patent Document 1 discloses a skin cleansing composition containing a monoester or diester of a fatty acid and polyethylene glycol, and a fatty acid ester composed of a fatty acid and a polyhydric alcohol. The composition containing these esters and having a fatty acid salt as a main agent is excellent in foaming property when washing the skin coated with a cosmetic containing a large amount of oily components.

[0004] As described above, although techniques for imparting foaming property during washing have been proposed so far, in order to give a better washing feeling during washing, not only good foaming property but also ease of foam expansion is important. That is, even when the foaming property is excellent, if the expansion is poor, a physical load is applied to expand the foam, which may lead to deterioration of the washing feeling during washing. In particular, when washing the oily components applied to the skin in a state where skin roughness has occurred due to atopic dermatitis or the like, in addition to friction occurring between the foam formed by the washing component and the skin, the fluidity of the foam decreases because the oily component is encapsulated in the foam, so the ease of foam expansion further decreases. The composition of Patent Document 1 described above may be inferior in the ease of foam expansion.

[0005] In addition, the body cleansing composition using a fatty acid salt also had a problem of feeling tight after washing. In response to this problem, for example, Patent Document 2 discloses a liquid skin cleanser containing a fatty acid salt, cationized polygalactomannan, polyethylene glycol, and a dihydric alcohol. This cleanser is excellent in imparting smoothness to the skin after rinsing.

[0006] As described above, although techniques for imparting smoothness to the skin immediately after washing have been proposed, in order to give a good feel to the skin exposed to the outside air after washing, it is important to maintain the smoothness of the skin immediately after washing. That is, even if the skin feels smooth immediately after washing, if the smoothness cannot be maintained when the skin is exposed to the outside air, the slippery feeling of the skin may not be felt, leading to a deterioration in the texture of the skin. In particular, when the skin after washing is exposed to a dry environment, the slippery feeling of the skin may deteriorate further. The cleanser of Patent Document 2 described above may be inferior in maintaining the smoothness of the skin in such a dry environment.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, the problem to be solved by the present invention is to provide a body cleansing composition containing a fatty acid salt as a main ingredient, which is excellent in foam retention and foam stretchability when washing the skin coated with a cosmetic containing a large amount of an oily component, and can impart smoothness to the skin even in a dry environment.

Means for Solving the Problems

[0009] As a result of intensive studies, the inventors of the present invention have found that the above problems can be solved by combining specific components shown below in specific mass ratios, and thus have completed the present invention.

[0010] That is, the present invention is Component (a): 0.1 to 15% by mass of a taurine derivative of acylmethylglycine represented by the following formula (1), Component (b): 5 to 40% by mass of a fatty acid salt having 8 to 22 carbon atoms, Component (c): 1 to 20% by mass of a di- to tetravalent alcohol having 3 to 6 carbon atoms containing, and the mass ratio (b) / (a) of component (b) to component (a) is 2 to 8.8 A body cleansing composition characterized by being.

Effects of the Invention

[0011] When the body cleansing composition of the present invention is used for cleansing the skin coated with a cosmetic containing a large amount of an oily component, it is excellent in foam retention and ease of foaming, so it gives a good washing feeling during washing, and even in a dry environment, it can impart a good smoothness to the skin.

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described. In this specification, a numerical range defined using the symbol "~" shall include the numerical values at both ends (upper limit and lower limit) of "~". For example, "2~5" represents 2 or more and 5 or less.

[0013] The body cleansing composition of the present invention (hereinafter, also simply referred to as "cleansing composition") contains at least component (a), component (b), and component (c). Hereinafter, each component will be described.

[0014] 〔Component (a)〕 Component (a) is a taurine derivative of acylmethylglycine represented by the following formula (1). As component (a), one or more selected from various taurine derivatives included in formula (1) can be used.

[0015]

Chemical formula

[0016] R 1 CO in formula (1) represents an acyl group having 8 to 22 carbon atoms, preferably 8 to 18 carbon atoms. The acyl group includes not only acyl groups derived from saturated or unsaturated fatty acids having 8 to 22 carbon atoms, but also acyl groups derived from mixed fatty acids containing two or more of these fatty acids. Examples of the acyl group include lauroyl group, myristoyl group, palmitoyl group, stearoyl group, oleoyl group, behenoyl group, etc. Examples of the acyl group derived from mixed fatty acids include coconut oil fatty acid acyl group, palm kernel oil fatty acid acyl group, etc. Preferably, the acyl group is a lauroyl group, myristoyl group, coconut oil fatty acid acyl group, palm kernel oil fatty acid acyl group. More preferably, it is a lauroyl group, coconut oil fatty acid acyl group, palm kernel oil fatty acid acyl group. When the number of carbon atoms of R 1 CO is too small, the foaming property may be poor, and when the number of carbon atoms is too large, the foam elongation property may be poor.

[0017] M 1 represents an alkali metal atom, 1 / 2 alkaline earth metal atom, organic ammonium or basic amino acid. Examples of the alkali metal atom include sodium and potassium, and examples of the alkaline earth metal atom include magnesium and calcium. Examples of the organic ammonium include monoethanolammonium, diethanolammonium, and triethanolammonium. Examples of the basic amino acid include arginine, lysine, and histidine. The basic amino acid may be a basic amino acid salt formed with the above alkali metal atom, 1 / 2 alkaline earth metal atom, or organic ammonium. Note that the "organic ammonium" in the present invention conceptually does not include amino acid ammonium formed from an amino acid and an organic amine. M 1 Preferably, it is sodium, potassium, magnesium, calcium, or triethanolammonium, and more preferably, it is sodium, potassium, or triethanolammonium.

[0018] The taurine derivative of acylmethylglycine represented by the formula (1) can be obtained, for example, by the following method. First, in the presence of an alkali, preferably in the presence of sodium hydroxide, N-methylglycine sodium is acylated with a fatty acid chloride to prepare an aqueous solution of acylmethylglycine sodium. This aqueous solution of acylmethylglycine sodium contains sodium chloride. To remove this, the aqueous layer is acidified with an acid such as sulfuric acid, and the oil layer containing acylmethylglycine and the aqueous layer containing sodium chloride are separated and purified. Next, a taurine salt that becomes the target counter ion, for example, sodium taurine, is charged into the oil layer containing acylmethylglycine. The charged amount of the taurine salt is preferably an amount equivalent to 1 to 1.2 times the number of moles of acylmethylglycine. Further, when charging the taurine salt, it is preferable to stir the oil layer containing acylmethylglycine, and the temperature during stirring is preferably 50 to 80°C. The pH of the aqueous solution of the taurine derivative of acylmethylglycine represented by the formula (1) prepared by this method is 6 to 8.

[0019] The content of component (a) in the detergent composition of the present invention is 0.1 to 15% by mass, preferably 0.5 to 10% by mass, and more preferably 1 to 6% by mass in the total amount of the composition. When the content of component (a) is too small, the foam may be less likely to stretch and the smoothness after drying may be inferior. When the content of component (a) is too large, the foam retention may be inferior.

[0020] 〔Component (b)〕 Component (b) is a fatty acid salt having 8 to 22 carbon atoms. The number of carbon atoms of the fatty acid salt is preferably 10 to 20, and more preferably 12 to 18. Examples of the fatty acid salt having 8 to 22 carbon atoms include caprylate, capric acid salt, laurate, myristate, palmitate, isopalmitate, stearate, isostearate, oleate, behenate, etc. One or more of these can be used. Further, a mixed fatty acid salt containing two or more of these fatty acid salts, such as coconut oil fatty acid salt, palm kernel oil fatty acid salt, beef tallow fatty acid salt, etc. can be used. Preferably, the fatty acid salt having 8 to 22 carbon atoms is laurate, myristate, palmitate, stearate, oleate, coconut oil fatty acid salt, palm kernel oil fatty acid salt, and more preferably laurate, myristate, palmitate, stearate.

[0021] Examples of the counter ion forming the fatty acid salt include sodium, potassium, ammonium, monoethanolammonium, diethanolammonium, triethanolammonium, etc. Preferably, they are sodium, potassium, triethanolammonium, and more preferably potassium.

[0022] In the detergent composition of the present invention, the content of component (b) is 5 to 40% by mass, preferably 8 to 35% by mass, more preferably 10 to 30% by mass, based on the total amount of the composition. When the content of component (b) is too small, the foaming property may be poor. When the content of component (b) is too large, the foam may be less likely to spread and the smoothness after drying may be poor.

[0023] Moreover, the mass ratio (b) / (a) of component (b) to component (a) is 2 to 80, preferably 2 to 40, more preferably 2 to 20, and even more preferably 2 to 5. When the mass ratio (b) / (a) is too large, the foam may be less likely to spread and the smoothness after drying may be poor. When the mass ratio (b) / (a) is too small, the foaming property may be poor.

[0024] [Component (c)] Component (c) is a C3-C6 di- to tetravalent alcohol. Examples of the C3-C6 di- to tetravalent alcohol include glycerin, diglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, isopentyldiol, etc., and one or more of these can be used. Preferably, they are glycerin, 1,3-butylene glycol, and propylene glycol, and more preferably glycerin.

[0025] In the detergent composition of the present invention, the content of component (c) is 1 to 20% by mass, preferably 2 to 15% by mass, more preferably 3 to 10% by mass, based on the total amount of the composition. When the content of component (c) is too small, the foam may be less likely to spread and the smoothness after drying may be poor. When the content of component (c) is too large, the foaming property may be poor.

[0026] Moreover, the mass ratio (b) / (c) of component (b) to component (c) is preferably 1 to 10, more preferably 1.5 to 8, and particularly preferably 2 to 6. When the mass ratio (b) / (c) is too large, the foam may be less likely to spread. When the mass ratio (b) / (c) is too small, the foaming property may be poor.

[0027] 〔Other components〕 In addition to the above components (a), (b) and (c), the detergent composition of the present invention usually contains water. Examples of the water include purified water, tap water, deionized water and the like. The water content in the detergent composition of the present invention is usually 25 to 90% by mass, preferably 40 to 85% by mass, based on the total amount of the composition.

[0028] Furthermore, the detergent composition of the present invention may contain other optional components as long as the effects of the invention are not impaired. As the other optional components, amphoteric surfactants, amino acid-based anionic surfactants, nonionic surfactants, pH adjusters, antioxidants, fragrances and the like can be appropriately blended. It should be noted that those corresponding to components (a) to (c) among the above other optional components are excluded. When the detergent composition of the present invention contains other optional components, the content thereof is usually 20% by mass or less, preferably 0.1 to 15% by mass, more preferably 1 to 10% by mass, based on the total amount of the composition.

[0029] 〔Production method〕 The production method of the detergent composition of the present invention is not particularly limited and can be appropriately selected according to the purpose. For example, the above components (a) to (c), other optional components as necessary, and water are mixed, and the detergent composition of the present invention is obtained by adjusting with water so that the total amount of the detergent composition is 100% by mass. The apparatus used for preparing the detergent composition of the present invention is not particularly limited and can be appropriately selected according to the purpose. For example, a stirring apparatus having a plurality of stirring blades such as a propeller, a turbine, a disperser and the like can be used.

Examples

[0030] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

[0031] [Examples 1 to 5. Reference Example 1 and Comparative Examples 1 to 5] <Preparation of detergent composition> The components (a) to (c) or component (a’) in Tables 1 and 2 were sequentially added to water, mixed, and uniformly dissolved, and the total amount was adjusted to 100% by mass with water to prepare the detergent compositions of Examples 1 to 5. Reference Example 1 and Comparative Examples 1 to 5. As each component in Tables 1 and 2, commercially available products provided as cosmetics were used. The content of each component in Tables 1 and 2 is shown in mass%. In the comparative examples shown in Table 2, when component (a’) was used instead of component (a), (a) in the mass ratio (b) / (a) was calculated based on the content of component (a’).

[0032] Examples 1 to 5. Reference Example 1 For each of the detergent compositions of Examples 1 to and Comparative Examples 1 to 5, evaluations of foam retention, smoothness after drying, and ease of stretching of the foam were conducted as described in the following (1) to (3).

[0033] <Evaluation of Detergent Composition> (1) Foam Retention An evaluation sample was prepared by mixing 10 g of the detergent composition, 90 g of tap water, and 0.1 g of a sunscreen composition shown in the following composition. Next, the evaluation sample was heated to 40°C and poured into a 1,000 mL graduated cylinder without foaming, and a diffuser stone (Bubble Mate, Starlet S105-D manufactured by Zudo Co., Ltd.) attached to a goldfish pump (Air Pump, Nichido Non-Noise S200 manufactured by Nippon Animal Drugs Co., Ltd.) was immersed, and foamed until the foam volume reached 1,000 mL at a flow rate of 1,000 mL / min. Furthermore, the foam volume was measured 5 minutes after foaming and standing still, and based on the measured foam volume, the foam retention was evaluated in four grades of "◎", "○", "△", and "×" according to the following criteria, and "◎" and "○" were judged as qualified, and "△" and "×" were judged as unqualified.

[0034] (Evaluation Criteria) ◎ (Qualified): Foam volume is 900 mL or more and 1,000 mL or less ○ (Qualified): Foam volume is 800 mL or more and less than 900 mL △ (Unqualified): Foam volume is 700 mL or more and less than 800 mL × (Failed): Foam volume is less than 700 mL

[0035] ※ Screen composition; Cyclopentasiloxane: 57.7% by mass, Titanium oxide: 20% by mass, Water: 10% by mass, Dimethicone: 5% by mass, Ethanol: 5% by mass, PEG-9 Polydimethylsiloxyethyl Dimethicone: 1% by mass, PEG-10 Dimethicone: 1% by mass, Methylparaben: 0.2% by mass, Propylparaben: 0.1% by mass

[0036] (2) Smoothness after drying Ten men and ten women aged 20 to 50 were used as panelists. 3 g of a diluted solution of the detergent composition heated to 40°C (1 g of the detergent composition was diluted with 9 g of tap water) was foamed by hand, and 1 g of the screen composition used in the evaluation of (1) above was spread over the entire forearm that had been pre-coated. It was washed for 3 minutes. After washing, it was rinsed with water at 40°C, towel-dried, and then dried for 30 minutes in an environment of temperature: 20°C, humidity: 30%. The smoothness of the skin was evaluated. Specifically, each panelist evaluated it in three levels according to the following absolute evaluation criteria, and based on the total score of the evaluation points, it was evaluated in four levels of "◎", "○", "△" and "×". "◎" and "○" were judged as qualified, and "△" and "×" were judged as unqualified.

[0037] <Absolute evaluation criteria> (Score): (Evaluation) 3 points: Strongly feel smoothness. 2 points: Feel smoothness. 1 point: Do not feel smoothness, and the slipperiness of the skin is insufficient.

[0038] <Criteria for four-level evaluation based on the total score of the evaluation points> ◎ (Qualified): Total score is 50 or more ○ (Qualified): Total score is 40 or more and less than 50 △ (Failed): Total score is 30 or more and less than 40 × (Failed): Total score is less than 30

[0039] (3) Ease of stretching the foam 5 g of a cleaning agent composition and 45 g of tap water were placed in a container of a miller (``IMF-100'' manufactured by Iwatani Corporation), heated to 40 °C, and then stirred for 20 seconds to create foam for evaluation. Next, 3 g of the screen composition used in the evaluation of (1) above was uniformly applied to artificial leather (length: 40 cm, width: 20 cm, thickness: 1 mm). Further, the previously prepared evaluation foam was uniformly applied to a portion 10 cm long from the tip of the artificial leather (length: 10 cm, width: 20 cm) to a thickness of 0.5 cm. After application, it was allowed to stand for 5 seconds. After standing, the artificial leather was tilted to 30 degrees with the foam-coated part on top, and the moving distance from the bottom of the initial foam in the 10 cm-long portion was measured until 10 seconds after tilting. Based on the measured moving distance of the foam, the ease of stretching of the foam was evaluated in four grades of "◎", "○", "△", and "×" according to the following criteria, and "◎" and "○" were judged as pass, and "△" and "×" were judged as fail.

[0040] (Evaluation Criteria) ◎ (Pass): Moving distance is 20 cm or more ○ (Pass): Moving distance is 15 cm or more and less than 20 cm △ (Fail): Moving distance is 10 cm or more and less than 15 cm × (Fail): Moving distance is less than 10 cm

[0041]

Table 1

[0042]

Table 2

[0043] The body cleansing agent compositions of Examples 1 to 6 all had good foam retention, ease of stretching of the foam, and smoothness after drying when washing the skin coated with a cosmetic containing a large amount of an oily component. On the other hand, in Comparative Example 1, since component (a) was not contained, the ease of stretching of the foam, foam retention, and smoothness after drying were insufficient. In Comparative Example 2, since the mass ratio (b) / (a) was too small, the foam retention was insufficient. In Comparative Example 3, since the content of component (b) was too high, the ease of foaming and the smoothness after drying were insufficient. In Comparative Example 4, since the content of component (c) was too low, the foam retention was insufficient and the smoothness after drying was also insufficient. In Comparative Example 5, since sodium N-lauroyl-N-methylglycinate (component (a')) was contained instead of component (a), the ease of foaming and the smoothness after drying were insufficient.

[0044] Furthermore, formulation examples of the body cleansing composition of the present invention are shown below. In each formulation example, the total amount was made 100% by mass using water.

[0045] [Table 3]

[0046] [Table 4]

[0047] When these detergent compositions of the formulation examples were used for cleaning the skin coated with a cosmetic containing a large amount of an oily component, they were excellent in foam retention and ease of foaming, so they gave a good washing feeling during washing, and even in a dry environment, they could impart good smoothness to the skin, and the effects of the present invention were recognized.

Industrial Applicability

[0048] As uses of the body cleansing composition of the present invention, it can be appropriately selected according to the purpose, and for example, it can be applied to body soap, hand soap, facial cleanser, etc.

Claims

Claim 1 Component (a): 0.1 to 15% by mass of a taurine derivative of acylmethylglycine represented by the following formula (1), Component (b): 5 to 40% by mass of a fatty acid salt having 8 to 22 carbon atoms, Component (c): 1 to 20% by mass of a di- to tetravalent alcohol having 3 to 6 carbon atoms A body cleansing composition, characterized in that the mass ratio (b) / (a) of component (b) to component (a) is 2 to 8.

8. 【Chemical 1】 (In formula (1), R １ CO represents an acyl group having 8 to 22 carbon atoms, and M １ represents an alkali metal atom, 1 / 2 alkaline earth metal atom, organic ammonium or basic amino acid.)

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