Cleaning agent

Abstract

This product provides a cleansing agent that is highly stable and lathers well, even when containing a large amount of oil-based ingredients. [Solution] A cleansing agent containing (a) an oily raw material, (b) an anionic surfactant, and (c) a monoglycerin fatty acid ester selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, wherein (b) and (c) are contained in a predetermined mass ratio. According to the cleansing agent of the present invention, since a large amount of oily raw material can be incorporated, when used as a cleansing agent for the face, body, or hair, it can give the skin or hair a moist feeling after use.

Description

Technical Field

[0001] The present invention relates to a cleaning agent. More specifically, it relates to a cleaning agent that contains an anionic surfactant and a predetermined monoglycerin fatty acid ester in a predetermined mass ratio, has a high stability even when a large amount of oily raw materials are blended, and has good foaming properties.

Background Art

[0002] In aqueous cleaning agents aimed at removing dirt on the face, body, hair, etc., oily raw materials may be blended for the purpose of imparting a moist feeling after cleaning. For example, Patent Document 1 discloses an aqueous skin cleaning agent containing a total of 0.1 to 20% by weight of a hydrocarbon-based paste-like oil agent and a non-hydrocarbon-based paste-like oil agent. Further, Patent Document 2 discloses a cleaning agent composition containing 10 to 50% by mass of an oily component, 20 to 50% by mass of a fatty acid alkanolamide, and an anionic surfactant.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when a large amount of oily raw materials are added to an aqueous cleansing agent, there are problems such as impaired stability and poor lathering. In this regard, while the aqueous skin cleansing agent described in Patent Document 1 has been confirmed to have good lathering and stability for two months in a cleansing agent containing 0.2 to 10% by weight of oily agents, it is unclear whether good lathering and storage stability can be obtained with a higher amount of oily agents. Similarly, regarding the cleansing agent composition described in Patent Document 2, while it has been confirmed that sufficient cleansing and face washing can be performed in a cleansing agent containing 15 or 20% by weight of oily components, lathering and storage stability have not been verified and remain unclear. In other words, even considering these patent documents, there is still not a sufficient supply of cleansing agents that are highly stable and have good lathering properties even when a large amount of oily raw materials is added. The present invention has been made to solve these problems and aims to provide a cleansing agent that is highly stable and has good lathering properties even when a large amount of oily raw materials is added. [Means for solving the problem]

[0005] As a result of diligent research, the present inventors have discovered that by blending an anionic surfactant with a monoglycerin fatty acid ester selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate in a predetermined mass ratio, it is possible to produce a detergent that is highly stable and lathers well, even when containing a large amount of oily raw materials. Based on this finding, the inventors have completed the following inventions.

[0006] (1) A first embodiment of the cleansing agent according to the present invention contains (a) an oily raw material, (b) an anionic surfactant, and (c) one monoglycerin fatty acid ester selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, and contains (b) and (c) in the following mass ratio; (c) If glyceryl caprylate is used, (b): (c) = 1: greater than 10 and less than 30, (c) is glyceryl caprate (b): (c) = 1: greater than 0.67 and less than 9, (c) is glyceryl undecylenate (b): (c) = 1: greater than 0.25 and less than 9, (c) is glyceryl laurate (b): (c) = 1: greater than 0.43 and less than 9, If (c) is glyceryl myristate, then (b): (c) = 1: greater than 0.67 and less than 2.33.

[0007] (2) A second embodiment of the cleansing agent according to the present invention contains (a) an oily raw material, (b) an anionic surfactant, and (c) two monoglycerin fatty acid esters selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, and contains (b) and (c) in the following mass ratio; (c) If (c) is glyceryl caprylate and glyceryl caprate, (b): (c) = 1: greater than 0.67 and less than 30, (c) If (c) is glyceryl caprylate and glyceryl undecylenate (b): (c) = 1: greater than 0.25 and less than 30, (c) If (b) is glyceryl caprylate and glyceryl laurate: (c) = 1: greater than 0.43 and less than 30, (c) If (c) is glyceryl caprylate and glyceryl myristate, (b): (c) = 1: greater than 0.67 and less than 30, (c) is glyceryl caprate and glyceryl undecylenate (b): (c) = 1: greater than 0.25 and less than 9, (c) is glyceryl caprate and glyceryl laurate (b): (c) = 1: greater than 0.43 and less than 9, (c) If (c) is glyceryl caprate and glyceryl myristate, (b): (c) = 1: greater than 0.67 and less than 9, (c) If glyceryl undecylenate and glyceryl laurate, (b): (c) = 1: greater than 0.25 and less than 9, (c) If glyceryl undecylenate and glyceryl myristate, (b): (c) = 1: greater than 0.25 and less than 9, (c) is glyceryl laurate and glyceryl myristate (b): (c) = 1: greater than 0.43 and less than 9.

[0008] (3) A third aspect of the cleansing agent according to the present invention contains (a) an oily raw material, (b) an anionic surfactant, and (c) three monoglycerin fatty acid esters selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, and contains (b) and (c) in the following mass ratio; (c) is glyceryl caprylate, glyceryl caprate, and glyceryl undecylenate (b): (c) = 1: greater than 0.25 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl caprate, and glyceryl laurate, (b): (c) = 1: greater than 0.43 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl caprate, and glyceryl myristate, (b): (c) = 1: greater than 0.67 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl laurate, and glyceryl myristate, (b): (c) = 1: greater than 0.43 and less than 30, (c) is glyceryl caprylate, glyceryl undecylenate, and glyceryl laurate (b): (c) = 1: greater than 0.25 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl undecylenate, and glyceryl myristate, (b): (c) = 1: greater than 0.25 and less than 30, (c) If (c) is glyceryl caprate, glyceryl undecylenate and glyceryl laurate, (b): (c) = 1: greater than 0.25 and less than 9, (c) is glyceryl caprate, glyceryl laurate and glyceryl myristate (b): (c) = 1: greater than 0.43 and less than 9, (c) is glyceryl caprate, glyceryl undecylenate and glyceryl myristate (b): (c) = 1: greater than 0.25 and less than 9, (b) If (c) is glyceryl undecylenate, glyceryl laurate, and glyceryl myristate: (c) = 1: greater than 0.25 and less than 9.

[0009] (4) A fourth aspect of the cleansing agent according to the present invention contains (a) an oily raw material, (b) an anionic surfactant, and (c) four monoglycerin fatty acid esters selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, and contains (b) and (c) in the following mass ratios; (c) If (c) is glyceryl caprylate, glyceryl caprate, glyceryl undecylenate and glyceryl laurate, (b): (c) = 1: greater than 0.25 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl caprate, glyceryl undecylenate and glyceryl myristate, (b): (c) = 1: greater than 0.25 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl caprate, glyceryl laurate and glyceryl myristate, (b): (c) = 1: greater than 0.43 and less than 30, (c) If (c) is glyceryl caprylate, glyceryl undecylenate, glyceryl laurate and glyceryl myristate, (b): (c) = 1: greater than 0.25 and less than 30, (b) If (c) is glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate: (c) = 1: greater than 0.25 and less than 9.

[0010] (5) A fifth aspect of the cleansing agent according to the present invention contains (a) an oily raw material, (b) an anionic surfactant, and (c) a monoglycerin fatty acid ester consisting of glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate, and contains (b):(c) in a mass ratio of more than 1:0.25 and less than 30.

[0011] (6) The cleaning agent according to the present invention may contain (a) an oily raw material in a proportion of 0% by mass or more and less than 75% by mass.

[0012] (7) The cleaning agent according to the present invention may contain (b) an anionic surfactant and (c) a monoglycerin fatty acid ester in a total amount of more than 7% by mass and less than 25% by mass.

[0013] (8) The cleaning agent according to the present invention may be a foaming cleaning agent.

[0014] (9) The cleaning agent according to the present invention may be a cleaning agent used for skin or hair.

Advantages of the Invention

[0015] According to the present invention, even when a large amount of an oily raw material is blended, a cleaning agent with high stability and good foaming can be obtained. In addition, a large amount of the oily raw material can be blended, and since the oily raw material remains appropriately after cleaning, when used as a cleaning agent for the face or body, it can give a moist feeling to the skin after use. Similarly, when used as a hair cleaning agent, it can give a moist feeling, a cohesive feeling, and a good feel when passing fingers through the hair after use.

Brief Description of the Drawings

[0016] [Figure 1] It is a schematic diagram showing the relationship between the blending ratio (mass ratio) of an anionic surfactant and a monoglycerin fatty acid ester and the type of monoglycerin fatty acid ester in the cleaning agent of the present invention. In the figure, the range of the blending ratio that provides high stability and good foaming is shown by the shaded area sloping upwards to the right. [Figure 2] It is a table showing the raw materials used in this example. [Figure 3] It is a table showing the evaluation results of the composition and stability in the cleaning agent produced by changing the blending ratio of glyceryl caprylate and an anionic surfactant. [Figure 4]This table shows the results of evaluating the composition and stability of detergents manufactured by varying the blending ratio of glyceryl caprate and anionic surfactant. [Figure 5] This table shows the results of compositional and stability evaluations for detergents manufactured by varying the blending ratio of glyceryl undecylenate and anionic surfactant. In the figure, "-" indicates "not evaluated". [Figure 6] This table shows the results of evaluating the composition and stability of detergents manufactured by varying the blending ratio of glyceryl laurate and anionic surfactant. [Figure 7] This table shows the results of evaluating the composition and stability of detergents manufactured by varying the amount of surfactant used. [Figure 8] This table shows the results of evaluating the composition and stability of cleaning agents manufactured using various oily raw materials. [Figure 9] This table shows the results of evaluating the composition and stability of cleaning agents manufactured by varying the amount of oily raw materials used. [Figure 10] This table shows the composition of the cleansing agents, the height of the foam when lathered, and the results of sensory evaluation of the quality of lathering by hand. [Figure 11] This table shows the composition of the cleansing agents, the height of the foam when they are lathered, and the results of sensory evaluation of foaming by hand. [Modes for carrying out the invention]

[0017] The present invention will be described in detail below.

[0018] "Cleaning agent" refers to a product intended to remove dirt. Furthermore, "water-based cleaning agent" refers to a cleaning agent that contains water as a base, dispersion medium, or solvent. Additionally, "foaming cleaning agent" refers to a cleaning agent that generates bubbles and has foaming properties when an appropriate amount of water is added and stirred.

[0019] In this invention, stability refers to the degree of change in state after storage for a certain period of time. That is, "having stability," "high stability," or "good stability" means that there is little or no change in state after a certain period of time, or that the period until a change in state occurs is long. Conversely, "not having stability," "low stability," or "poor stability" means that there is a large change in state after a certain period of time, such as separation of the liquid phase, or that the storage period until a change in state occurs is short. Stability can be evaluated, for example, by placing the cleaning agent in a sealed container, storing it at room temperature or a relatively high temperature of about 40°C for a certain period of time, and then visually observing its state.

[0020] In this invention, "foaming" refers to the way or state of foam when a detergent is foamed, and can be used synonymously with "foaming power." That is, "good foaming" means that the detergent foams quickly or produces a large amount of foam when foamed. Conversely, "poor foaming" means that the detergent foams slowly or produces a small amount of foam when foamed.

[0021] Foaming can be evaluated, for example, by the methods (1) to (4) below. In the examples described later, the height of the foam produced is measured and evaluated in accordance with the method (3) below. Alternatively, for simplicity, the washing product can be taken in the hand, lathered by hand, and the speed of foaming, the amount of foam, the quality of the foam, etc., can be evaluated visually and by touch. (1) Drop method (Ross-Miles method): The test liquid is dropped from a certain height at a constant speed to the bottom of a vertically positioned glass tube, and the height of the bubbles produced is measured. The height is also measured 5 minutes after the drop ends to evaluate the persistence of the bubbles. (2) Shaking method: The sealed container containing the test solution is shaken up and down, and the volume of bubbles produced is measured. (3) Stirring method: The mixer device containing the test liquid is rotated at a constant speed, and the volume of the resulting bubbles is measured. (4) Air supply method: Air is supplied at a constant flow rate from a tube attached to the test solution, and the volume of bubbles is measured.

[0022] Because the cleansing agent according to the present invention can contain a large amount of oily raw materials, it can give the skin a moist feeling after use. Therefore, the cleansing agent according to the present invention can be used as a cleansing agent for the skin, such as a makeup remover (cleansing), facial wash, body soap, or all-over shampoo.

[0023] Because the cleansing agent according to the present invention can contain a large amount of oily raw materials, it can give hair a moist feel, manageability, and smooth texture after use. Therefore, the cleansing agent according to the present invention can be used as a cleansing agent for hair, such as a hair shampoo.

[0024] An "oil-based raw material" refers to a substance that dissolves in oil but not in water. In this invention, oil-based raw materials that can be used in cosmetics, quasi-drugs, pharmaceuticals, etc., can be used. Oil-based raw materials used in cosmetics are generally classified into oils and fats, higher fatty acids, waxes, hydrocarbons, esters, higher alcohols, and silicone oils based on their chemical structure, and any of these can be used. Furthermore, oil-based raw materials that are liquid, solid, or semi-solid (paste-like, etc.) at room temperature can be used.

[0025] For example, examples of oils and fats include horse oil, coconut oil, shea butter, shea butter oil, rice germ oil, olive oil, camellia oil, grapeseed oil, macadamia nut oil, castor oil, apricot oil, triethylhexanoin, etc. Examples of higher fatty acids include coconut oil fatty acids, behenic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, etc. Examples of waxes include jojoba seed oil, carnauba wax, candelilla wax, beeswax, lanolin, etc. Examples of hydrocarbons include olefin hydrocarbons such as hydrogenated polyisobutene, isododecane, and tetradecene, mineral oil (liquid paraffin), paraffin, petrolatum, ceresin, microcrystalline wax, squalane, etc. Examples of tel compounds include cetyl palmitate, ethylhexyl palmitate, isopropyl myristate, 2-octyldodecyl myristate, cetyl 2-ethylhexanoate, and diisostearyl malate. Examples of higher alcohols include cetyl alcohol, stearyl alcohol, isostearyl alcohol, and 2-octyldodecanol. Examples of silicone oils include straight silicone oils such as dimethicone, amino-modified silicone oils such as amodimethicone, alkyl-modified silicone oils such as stearyldimethicone, polyether-modified silicone oils such as PEG-12 dimethicone, phenyl-modified silicones such as methylphenylpolysiloxane, and cyclic polysiloxanes such as cyclopentasiloxane.

[0026] Oily raw materials may be blended into the detergent alone, or two or more may be blended in combination. The amount of oily components can be set appropriately depending on the use and application area of ​​the detergent and the desired feel, but from the viewpoint of stability, if the total detergent is considered to be 100, then 0% by mass or more and less than 75% can be preferably exemplified, 0% by mass or more and 70% or less is more preferable, and 0% by mass or more and 65% or less is even more preferable.

[0027] In this invention, the "anionic surfactant" can be one that is suitable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of anionic surfactants include sulfonates (α-olefin sulfonates, linear alkylbenzene sulfonates, α-sulfo fatty acid methyl esters, dialkyl sulfosuccinates, alkanesulfonates, etc.), amino acid-type surfactants such as N-acyl amino acid salts (N-acyl aspartate, N-acyl glutamate, N-acylglycine, N-acyl sarcosine salts, N-acyl methylalanine salts, acyl isethionates, etc.) and N-acyl taurine salts, fatty acid salts (sodium fatty acids, potassium fatty acids, etc.), carboxylates (hydroxyether carboxylates, alkyl ether carboxylates, etc.), sulfate esters (alkyl sulfates, higher fatty acid alkanolamide sulfates, polyoxyethylene alkyl sulfates, etc.), phosphate esters (monoalkyl phosphates, polyoxyethylene alkyl ether phosphates, etc.), acyl lactates, alkyl sulfates (alkyl sulfates, alkyl ether sulfates, etc.). These anionic surfactants may be incorporated into the detergent individually or in combination of two or more types.

[0028] The monoglycerin fatty acid esters used are glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, or glyceryl myristate. One of these may be incorporated into the cleansing agent alone, or two or more may be incorporated in combination.

[0029] By blending anionic surfactants and monoglycerin fatty acid esters in a predetermined ratio, a detergent with high stability and good foaming properties can be produced even if it contains a large amount of oily raw materials. The blending ratio (in this invention, anionic surfactants are indicated by (b) and monoglycerin fatty acid esters by (c), and anionic surfactant:monoglycerin fatty acid ester may be abbreviated as "(b):(c)") is schematically shown in Figure 1. As shown in Figure 1, the blending ratio varies depending on the type of monoglycerin fatty acid ester used. As shown in the examples described later, when two or more types of monoglycerin fatty acid esters are used in combination, a detergent with high stability and good foaming properties can be obtained in the blending ratio across the entire numerical range from the minimum to the maximum value when each monoglycerin fatty acid ester is used alone.

[0030] In the first embodiment of the detergent of the present invention, one of the above monoglycerin fatty acid esters is used. That is, when glyceryl caprylate is used as the monoglycerin fatty acid ester, the blending ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 10, 10.5 or more, 11 or more, 11.5 or more, or 12 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0031] Furthermore, when glyceryl caprate is used in the first embodiment, the blending ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0032] Furthermore, when glyceryl undecylenate is used in the first embodiment, the blending ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0033] Furthermore, when glyceryl laurate is used in the first embodiment, the blending ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.67 or less, 5 or less, 4.5 or less, or 4 or less.

[0034] Furthermore, when glyceryl myristate is used in the first embodiment, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be exemplified by less than 2.33, 2.2 or less, 2.1 or less, 2 or less, 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, or 1.5 or less.

[0035] In a second embodiment of the detergent of the present invention, two of the above-mentioned monoglycerin fatty acid esters are used. That is, when glyceryl caprylate and glyceryl caprate are used as monoglycerin fatty acid esters, the blending ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0036] Furthermore, in the second embodiment, when glyceryl caprylate and glyceryl undecylenate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0037] Furthermore, in the second embodiment, when glyceryl caprylate and glyceryl laurate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0038] Furthermore, in the second embodiment, when glyceryl caprylate and glyceryl myristate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0039] Furthermore, in the second embodiment, when glyceryl caprate and glyceryl undecylenate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0040] Furthermore, in the second embodiment, when glyceryl caprate and glyceryl laurate are used, the mixing ratio (mass ratio) can be as follows: (b) is 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0041] Furthermore, in the second embodiment, when glyceryl caprate and glyceryl myristate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0042] Furthermore, in the second embodiment, when glyceryl undecylenate and glyceryl laurate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0043] Furthermore, in the second embodiment, when glyceryl undecylenate and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0044] Furthermore, in the second embodiment, when glyceryl laurate and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.67 or less, 5 or less, 4.5 or less, or 4 or less.

[0045] In a third embodiment of the detergent of the present invention, three of the above monoglycerin fatty acid esters are used. That is, when glyceryl caprylate, glyceryl caprate, and glyceryl undecylenate are used as monoglycerin fatty acid esters, the blending ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0046] Furthermore, in the third embodiment, when glyceryl caprylate, glyceryl caprate, and glyceryl laurate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0047] Furthermore, in the third embodiment, when glyceryl caprylate, glyceryl caprate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.67, 0.7 or more, 0.8 or more, 0.9 or more, or 1 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0048] Furthermore, in the third embodiment, when glyceryl caprylate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0049] Furthermore, in the third embodiment, when glyceryl caprylate, glyceryl undecylenate, and glyceryl laurate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0050] Furthermore, in the third embodiment, when glyceryl caprylate, glyceryl undecylenate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0051] Furthermore, in the third embodiment, when glyceryl caprate, glyceryl undecylenate, and glyceryl laurate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0052] Furthermore, in the third embodiment, when glyceryl caprate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0053] Furthermore, in the third embodiment, when glyceryl caprate, glyceryl undecylenate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0054] Furthermore, in the third embodiment, when glyceryl undecylenate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0055] In a fourth embodiment of the detergent of the present invention, four of the above monoglycerin fatty acid esters are used. That is, when glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, and glyceryl laurate are used as monoglycerin fatty acid esters, the blending ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0056] Furthermore, in the fourth embodiment, when using glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, and glyceryl myristate, the blending ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0057] Furthermore, in the fourth embodiment, when glyceryl caprylate, glyceryl caprate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.43, 0.5 or more, 0.6 or more, or 0.67 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0058] Furthermore, in the fourth embodiment, when glyceryl caprylate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0059] Furthermore, in the fourth embodiment, when glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and glyceryl myristate are used, the mixing ratio (mass ratio) is such that, with (b) being 1, the lower limit of (c) can be exemplified by greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be exemplified by less than 9, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, 6 or less, or 5.67 or less.

[0060] In a fifth embodiment of the detergent of the present invention, all five types of monoglycerin fatty acid esters are used. In this case, the mixing ratio (mass ratio) is such that (b) is 1, the lower limit of (c) can be greater than 0.25, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, or 0.33 or more, and the upper limit can be less than 30, 29 or less, 28 or less, 27 or less, 26 or less, 25 or less, or 24 or less.

[0061] The amounts of anionic surfactant and monoglycerin fatty acid ester can be appropriately set according to the intended use and application site of the detergent and the desired feel. However, from the viewpoint of stability, a suitable example is more than 7% by mass and less than 25% by mass, with the total detergent being 100%, more preferably 8% by mass or more, even more preferably 8% by mass or more and 20% by mass or less, even more preferably 8% by mass or more and 19% by mass or less, 8% by mass or more and 18% by mass or less, 8% by mass or more and 17% by mass or less, 8% by mass or more and 16% by mass or less, and even more preferably 8% by mass or more and 15% by mass or less.

[0062] The detergent of the present invention may contain components other than those described in (a), (b), and (c) above, as long as they do not impair the effects of the present invention. Examples of such other components include solvents or dispersion media such as water, polyhydric alcohols such as ethanol, glycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, and pentylene glycol, sugars such as sorbitol, nonionic surfactants, cationic surfactants, amphoteric surfactants, pH adjusters, colorants, plant and animal extracts, vitamins and their derivatives, chelating agents, inorganic or organic salts, solubilizers, preservatives, bactericides, wetting agents, UV absorbers, thickeners, fragrances, cationic polymers, cooling agents, and solubilizers. These other components may be added as needed during or after the preparation of the detergent.

[0063] The form of the cleansing agent of the present invention is not particularly limited, but can be, for example, liquid, cream, or gel.

[0064] The cleaning agent of the present invention can be produced by mixing (a), (b), and (c) above, as well as a solvent such as water, according to conventional methods. More specifically, as shown in the examples described later, one can mix (b) anionic surfactant and water on one side, and (a) oily raw material and (c) monoglycerin fatty acid ester on the other side. An example of a production procedure in which both mixtures are heated separately and then mixed together can be given.

[0065] The present invention will be described below based on various examples. However, the technical scope of the present invention is not limited to the features shown in these examples. Furthermore, in these examples, "%" represents mass %((w / w)%) unless otherwise specified. [Examples]

[0066] <Test Method> Unless otherwise specified, the tests were conducted using the following methods. (1) Raw materials used In this example, a cleaning agent was manufactured using the raw materials shown in Figure 2 (all commercially available products).

[0067] (2) Manufacturing of detergents In this embodiment, the cleaning agent was manufactured using the following steps 1 to 5. 1. Purified water and an anionic surfactant were uniformly mixed at room temperature to obtain mixture A. 2. The oily raw material and monoglycerin fatty acid ester were mixed to obtain mixture B. 3. Mixture A and Mixture B were each heated to 80°C. 4. Mixture B was slowly added to mixture A while it was being heated and stirred with a propeller. After the addition was complete, the mixture was stirred for 10 minutes. 5. Allow to cool to room temperature, and the manufacturing process was considered complete.

[0068] (3) Evaluation of stability The cleaning solution was placed in a sealed container and left in a 40°C environment for 1 to 4 weeks. After 1 week (1W), 2 weeks (2W), 3 weeks (3W), or 4 weeks (4W), the appearance was visually observed and evaluated according to the following criteria. ○: Remains in layer 1 (no or very little change in state). ×: Separated into two layers.

[0069] (4) Evaluation of foaming An appropriate amount of the prepared cleaning agent was placed in a beaker, water was added, and the mixture was stirred in a homomixer to create foam. The appearance of the generated foam was visually inspected and evaluated.

[0070] <Example 1> Investigation of the blending ratio of glyceryl caprylate and anionic surfactant. The mixing ratio of glyceryl caprylate, a monoglyceride of caprylic acid (a fatty acid with 8 carbon atoms), with anionic surfactants was investigated. Specifically, detergents numbered 1 to 9 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate (sodium tetradecenesulfonate) and glyceryl caprylate from 1:2.33 to 2.30 (mass ratio), and their stability and foaming properties were evaluated. The total amount of surfactant was 10% (pure content). The composition and stability evaluation results for samples 1 to 9 are shown in Figure 3.

[0071] As shown in Figure 3, No. 5 (anionic surfactant: glyceryl caprylate = 1:12) to No. 8 (same 1:24) remained stable for more than one week. Furthermore, No. 5 to 8 also exhibited good foaming. After the foaming evaluation, the amount of oily residue adhering to the beakers and mixers after rinsing them with water was small. From these results, it became clear that a mixing ratio of anionic surfactant to glyceryl caprylate is preferably greater than 1:10 but less than 1:30 (mass ratio), and more preferably between 1:12 and 1:24 (mass ratio).

[0072] <Example 2> Investigation of the blending ratio of glyceryl caprate and anionic surfactant. The mixing ratio of glyceryl caprate, a monoglyceride of capric acid (a fatty acid with 10 carbon atoms), with anionic surfactants was investigated. Specifically, detergents for samples 1 to 9 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate to glyceryl caprate from 1:0.25 to 9 (mass ratio), and their stability and foaming properties were evaluated. The total amount of surfactant was 10% (pure content). The composition and stability evaluation results for samples 1 to 9 are shown in Figure 4.

[0073] As shown in Figure 4, formulations No. 4 (anionic surfactant: glyceryl caprate = 1:1) to No. 8 (same 1:5.67) remained stable for more than 4 weeks. Furthermore, formulations No. 4 to 8 also exhibited good foaming. After the foaming evaluation, the amount of oily residue adhering to the beakers and mixers after rinsing them with water was small. From these results, it became clear that a mixing ratio of anionic surfactant to glyceryl caprate of greater than 1:0.67 to less than 1:9 (mass ratio) is preferable, and a ratio of 1:1 or greater to 1:5.67 or less (mass ratio) is more preferable.

[0074] <Example 3> Investigation of the blending ratio of glyceryl undecylenate and anionic surfactant The mixing ratio of glyceryl undecylenate, a monoglyceride of undecylenic acid (a fatty acid with 11 carbon atoms), with anionic surfactants was investigated. Specifically, detergents for samples 1 to 10 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate and glyceryl undecylenate from 1:0.25 to 9 (mass ratio), and their stability and foaming properties were evaluated. The mixing ratio was calculated assuming a purity of 45% for glyceryl undecylenate. The total amount of surfactant was 10% (pure content). The composition and stability evaluation results for samples 1 to 10 are shown in Figure 5.

[0075] As shown in Figure 5, No. 9 (anionic surfactant: glyceryl undecylenate = 1:5.67) was stable for more than one week, and Nos. 2 (same 1:0.33) to No. 8 (same 1:4) were stable for more than four weeks. In addition, Nos. 2 to 9 also produced good foam. After the foaming evaluation, the amount of oily residue adhering to the beakers and mixers after rinsing them with water was small. From these results, it was found that the mixing ratio of anionic surfactant to glyceryl undecylenate is preferably greater than 1:0.25 to less than 1:9 (mass ratio), and more preferably between 1:0.33 and 1:5.67 (mass ratio).

[0076] <Example 4> Investigation of the blending ratio of glyceryl laurate and anionic surfactant The mixing ratio of glyceryl laurate, a monoglyceride of lauric acid (a fatty acid with 12 carbon atoms), with anionic surfactants was investigated. Specifically, detergents numbered 1 to 5 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate to glyceryl laurate from 1:0.43 to 9 (mass ratio), and their stability and foaming properties were evaluated. The total amount of surfactant was 10% (pure content). The composition and stability evaluation results for samples 1 to 5 are shown in Figure 6.

[0077] As shown in Figure 6, No. 2 (anionic surfactant: glyceryl laurate = 1:0.67) to No. 4 (same 1:4) were stable for more than one week, and No. 2 (same 1:0.67) and No. 3 (same 1:1) were stable for more than four weeks. In addition, No. 2 to 4 also produced good foam. After the foaming evaluation, the amount of oily component adhering to the beakers and mixers after rinsing them with water was small. From these results, it was found that the mixing ratio of anionic surfactant to glyceryl laurate is preferably greater than 1:0.43 to less than 1:9 (mass ratio), more preferably 1:0.67 or greater (mass ratio), and even more preferably 1:0.67 or greater to 1:4 or less (mass ratio).

[0078] <Example 5> Investigation of the blending ratio of glyceryl myristate and anionic surfactant The mixing ratio of glyceryl myristate, a monoglyceride of myristic acid (a fatty acid with 14 carbon atoms), with anionic surfactants was investigated. Specifically, detergents for samples 1 to 4 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate to glyceryl myristate from 1:0.67 to 2.33 (mass ratio), and their stability and foaming properties were evaluated. The total amount of surfactant was 10% (pure content). The upper row of Table 1 shows the composition of samples 1 to 4, and the lower row shows the results of the stability evaluation. [Table 1]

[0079] As shown in Table 1, No. 2 (anionic surfactant:glyceryl myristate = 1:1) and No. 3 (same 1:1.5) remained stable for more than 4 weeks. In addition, No. 2 and No. 3 also exhibited good foaming. After the foaming evaluation, the amount of oily residue adhering to the beakers and mixers after rinsing them with water was small. From these results, it became clear that a mixing ratio of anionic surfactant to glyceryl myristate of greater than 1:0.67 to less than 1:2.33 (mass ratio) is preferable, and a ratio of 1:1 or greater to 1:1.5 or less (mass ratio) is more preferable.

[0080] <Example 6> Examination of surfactant formulation amount The amount of surfactant used was investigated. Specifically, detergents for samples 1 to 5 were prepared by varying the total amount of surfactant from 7% to 25%, and their stability and foaming properties were evaluated. The mixing ratio of anionic surfactant to monoglycerin fatty acid ester was 3:7 (1:2.33) (mass ratio). The anionic surfactant used was sodium olefin (C14-16) sulfonate or TEA cocoyl glutamate (N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine solution), and the monoglycerin fatty acid ester used was glyceryl caprate. The composition and stability evaluation results for samples 1 to 5 are shown in Figure 7.

[0081] As shown in Figure 7, No. 2 (8% surfactant) to No. 4 (20% surfactant) were stable for more than one week, and No. 2 (8% surfactant) and No. 3 (10% surfactant) were stable for more than four weeks. Furthermore, No. 2 to 4 also exhibited good foaming. From these results, it became clear that the amount of surfactant (total amount of anionic surfactant and monoglycerin fatty acid ester) is preferably more than 7% and less than 25%, more preferably 8% to 20%, and even more preferably 8% to 10%.

[0082] <Example 7> Examination of the types of anionic surfactants The types of anionic surfactants were investigated. Specifically, detergents for samples 1-4 were prepared using sodium olefin (C14-16) sulfonate (α-olefin sulfonate), TEA cocoyl glutamate (N-acyl amino acid salt), potassium myristate (potassium tetradecanoate, soap, fatty acid salt), and sodium laureth-6 carboxylate (sodium polyoxyethylene lauryl ether acetate, carboxylate salt), and their stability and foaming properties were evaluated. The mixing ratio of anionic surfactant to monoglycerin fatty acid ester was 3:7 (1:2.33) (mass ratio), and the total amount of surfactant was 10%. The upper row of Table 2 shows the composition of samples 1-4, and the lower row shows the results of the stability evaluation. [Table 2]

[0083] As shown in Table 2, samples No. 1 to No. 4 were all stable for more than 4 weeks. Furthermore, samples No. 1 to No. 4 all exhibited good foaming properties. From these results, it is clear that the present invention can produce a detergent that is highly stable and foams well, regardless of the type of anionic surfactant used.

[0084] <Example 8> Examination of types of oily raw materials The types of oily raw materials were investigated. Specifically, mineral oil (liquid paraffin) and petrolatum were used as hydrocarbons; rice germ oil and triethylhexanoin (glyceryl tri-2-ethylhexanoate) were used as oils and fats; jojoba seed oil was used as a wax; ethylhexyl palmitate (2-ethylhexyl palmitate) was used as an ester; and dimethicone (methylpolysiloxane), cyclopentasiloxane (decamethylcyclopentasiloxane), and phenyl trimethicone (methylphenylpolysiloxane) were used as silicone oils. Detergents for samples 1 to 9 were prepared using these materials, and their stability and foaming properties were evaluated. The mixing ratio of anionic surfactant to monoglycerin fatty acid ester was 3:7 (1:2.33) (by mass), and the total amount of surfactant was 10%. The composition and stability evaluation results for samples 1 to 9 are shown in Figure 8.

[0085] As shown in Figure 8, samples No. 1 to 9 were all stable for more than two weeks. Furthermore, samples No. 1, No. 3 to 5, No. 7, and No. 8 were stable for more than three weeks. In addition, samples No. 1, No. 3, No. 5, No. 7, and No. 8 were stable for more than four weeks. Furthermore, samples No. 1 to 9 also exhibited good foaming. From these results, it is clear that the present invention can produce a detergent with high stability and good foaming, regardless of the type of oily raw material used.

[0086] <Example 9> Examination of the amount of oily raw materials used The amount of oily raw materials was investigated. Specifically, detergents for samples 1 to 6 were prepared by varying the amount of oily raw materials from 0% to 80%, and their stability and foaming properties were evaluated. The mixing ratio of anionic surfactant to monoglycerin fatty acid ester was 3:7 (1:2.33) (by mass), and the total amount of surfactant was 10%. Sodium olefin (C14-16) sulfonate was used as the anionic surfactant, and glyceryl caprate was used as the monoglycerin fatty acid ester. The composition and stability evaluation results for samples 1 to 6 are shown in Figure 9.

[0087] As shown in Figure 9, samples No. 1 (0% oily raw material) to No. 4 (70% oily raw material) were stable for more than one week, and samples No. 1 (0% oily raw material) to No. 3 (60% oily raw material) were stable for more than four weeks. Furthermore, samples No. 1 to 4 also exhibited good foaming. From these results, it became clear that the amount of oily raw material is preferably less than 75%, and more preferably 70% or less.

[0088] <Example 10> Quantitative evaluation of foaming Detergents for the comparative examples and samples 1-6 were prepared, and their foaming properties were quantitatively evaluated. The comparative examples used anionic surfactant (TEA cocoyl glutamate) and amphoteric surfactant (cocamidopropyl betaine) as surfactants, and cyclopentasiloxane as the oily raw material. Sample No. 1 used monoglycerin fatty acid ester (glyceryl caprate) instead of the amphoteric surfactant, but otherwise used the same raw materials as the comparative examples. Samples No. 2-6 used anionic surfactant (sodium olefin (C14-16) sulfonate) and monoglycerin fatty acid ester (glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, or glyceryl myristate) as surfactants, and mineral oil as the oily raw material. Sample No. 6 had a higher proportion of oily raw material (70%). The total amount of surfactants in all samples was 10%.

[0089] 10 g of the prepared washing agent and 190 g of water were placed in a 500 mL tall beaker and mixed uniformly, taking care not to create foam. Next, the mixture was stirred for 30 seconds at 5000 rpm using a homomixer to generate foam. After standing for 5 minutes, the height of the remaining foam was measured. Separately, about 1 g of the prepared washing agent was taken by hand, about 5 g of water was added, and the foaming ability was evaluated visually and by touch. The results were scored as ○ for good foaming ability by hand and × for poor foaming ability by hand. Figure 10 shows the composition, foam height, and sensory evaluation results of foaming ability by hand for the comparative example and samples 1 to 6.

[0090] As shown in Figure 10, the foam height was 0 cm for the comparative example, while it was 5.5 cm for No. 1. Foaming by hand was also poor (×) for the comparative example, while it was good (○) for No. 1. In other words, while using anionic surfactants and amphoteric surfactants together resulted in almost no foaming, it became clear that excellent foaming could be achieved by combining anionic surfactants and monoglycerin fatty acid esters in a predetermined mass ratio.

[0091] Furthermore, the foam height for samples No. 1-5 all exceeded 5 cm, and the foaming action by hand was also good for all of them (○). In other words, it was found that excellent foaming can be obtained regardless of which of the following monoglycerin fatty acid esters is used: glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, or glyceryl myristate.

[0092] Furthermore, the foam height of No. 6 (containing 70% oily ingredients) was 6.4 cm, which was almost the same as No. 1 to No. 5 (containing 50% oily ingredients). No. 6 also lathered well when created by hand (○). In other words, it became clear that by blending anionic surfactants and monoglycerin fatty acid esters in a predetermined mass ratio, excellent lathering can be obtained even when a high proportion of oily ingredients are included.

[0093] Furthermore, for samples No. 1-6, after the foaming evaluation, the degree of oily residue on the beakers and mixers after rinsing them with water was minimal. After rinsing hands with water, a moderate amount of oily material remained on the hands, leaving a moist feeling.

[0094] <Example 11> Investigation of blending ratios of multiple types of monoglycerin fatty acid esters and anionic surfactants The mixing ratio with anionic surfactants was investigated when multiple types of monoglycerin fatty acid esters were used in combination. Specifically, detergents for samples 1 to 3 were prepared by varying the mixing ratio of sodium olefin (C14-16) sulfonate and monoglycerin fatty acid esters (glyceryl caprylate and glyceryl caprate in a 1:1 mass ratio) from 1:2.33 to 20 (mass ratio), and their stability and foaming properties were evaluated. The total amount of surfactant was 10% (pure content). The upper row of Table 3 shows the composition of samples 1 to 3, and the lower row shows the results of the stability evaluation. [Table 3]

[0095] No. 1 (anionic surfactant: monoglycerin fatty acid ester = 1:2.33) is a blending ratio that was unsuitable when only glyceryl caprylate was used as the monoglycerin fatty acid ester (see Example 1), but was suitable when only glyceryl caprate was used (see Example 2). No. 2 (same 1:10) is a blending ratio that was unsuitable when either only glyceryl caprylate or only glyceryl caprate was used as the monoglycerin fatty acid ester (see Examples 1 and 2). No. 3 (same 1:20) is a blending ratio that was suitable when only glyceryl caprylate was used as the monoglycerin fatty acid ester (see Example 1), but was unsuitable when only glyceryl caprate was used (see Example 2).

[0096] As shown in Table 3, No. 1 (1:1 ratio) to No. 3 (1:20 ratio) were all stable for more than one week. Furthermore, No. 1 to 3 also exhibited good foaming. From these results, it became clear that when multiple types of monoglycerin fatty acid esters are used in combination in a detergent containing anionic surfactants and monoglycerin fatty acid esters in predetermined proportions, a detergent with high stability and good foaming can be obtained across the entire numerical range from the minimum to the maximum proportions compared to when each monoglycerin fatty acid ester is used alone.

[0097] <Example 12> Investigation of monoglycerin fatty acid esters Detergents for samples 1-4 were prepared by blending sodium olefin (C14-16) sulfonate and monoglycerin fatty acid esters in a ratio of 1:1.5 (mass ratio). The monoglycerin fatty acid esters used were glyceryl stearate, glyceryl isostearate, glyceryl oleate, and glyceryl behenate, which are monoglycerides of stearic acid (a fatty acid with 18 carbon atoms), isostearic acid (a fatty acid with 18 carbon atoms), oleic acid (a fatty acid with 18 carbon atoms), and behenic acid (a fatty acid with 22 carbon atoms). For samples 1-4, the foam height and foaming by hand were evaluated in the same manner as in Example 10. Figure 11 shows the composition, foam height, and sensory evaluation results for foaming by hand for samples 1-4.

[0098] As shown in Figure 11, the foam heights for No. 1 and No. 4 were 0 cm, No. 2 was 5.3 cm, and No. 3 was 3.8 cm. On the other hand, none of No. 1-4 foamed at all when tested by hand. In other words, the detergents containing glyceryl stearate and glyceryl behenate did not foam at all. Furthermore, the detergents containing glyceryl isostearate and glyceryl oleate foamed in a homomixer, but did not foam when tested by hand. In addition, after rinsing with water following the foaming evaluation, a large amount of oily components adhered to the beaker walls and hands after using the detergents containing glyceryl isostearate and glyceryl oleate, resulting in a sticky and unpleasant feel. From this, it became clear that none of them were practical as detergents for everyday use.

[0099] From these results, it became clear that, in order to obtain a detergent that produces good foam even when used in combination with an anionic surfactant in a predetermined mass ratio and contains a large amount of oily raw materials, the preferred monoglycerin fatty acid esters are glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, glyceryl laurate, and / or glyceryl myristate.

Claims

1. A cleansing agent comprising (a) an oily raw material, (b) an anionic surfactant, and (c) one monoglycerin fatty acid ester selected from glyceryl caprylate, glyceryl caprate, glyceryl undecylenate, and glyceryl myristate, and containing (b) and (c) in the following mass ratio; (c) is glyceryl caprylate (b): (c) = 1: greater than 10 and less than 30, (c) is glyceryl caprate (b): (c) = 1: greater than 0.67 and less than 9, (c) is glyceryl undecylenate (b): (c) = 1: greater than 0.25 and less than 9, (c) is glyceryl myristate (b): (c) = 1: greater than 0.67 and less than 2.

33.

2. The cleaning agent according to claim 1, comprising (a) an oily raw material in an amount of 0% by mass or more and less than 75% by mass.

3. The detergent according to claim 1 or 2, comprising (b) anionic surfactant and (c) monoglycerin fatty acid ester in a total amount of more than 7% by mass and less than 25% by mass.

4. The cleaning agent according to claim 1, wherein the cleaning agent is a foaming cleaning agent.

5. The cleansing agent according to claim 4, wherein the cleansing agent is a cleansing agent used on skin or hair.

6. (a) an oily raw material, (b) an anionic surfactant, and (c) a monoglycerin fatty acid ester which is glyceryl laurate, and (b) and (c) are contained in the following mass ratio, A detergent containing (b) anionic surfactant and (c) monoglycerin fatty acid ester in total amount of more than 7% by mass and less than 25% by mass; (b): (c) = 1: greater than 0.43 and less than 9.

7. The cleaning agent according to claim 6, which contains 0% by mass or more and less than 75% by mass of the oily raw material (a).

8. The cleaning agent according to claim 6 or 7, wherein the cleaning agent is a foaming cleaning agent.

9. The cleansing agent according to claim 8, wherein the cleansing agent is a cleansing agent used on skin or hair.

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