Cleaning agent having aurora-like appearance

Abstract

To provide a cleaning agent having an excellent appearance which appears colored under white light (aurora-like appearance) with no need of containing any pigment.SOLUTION: There is provided a cleaning agent which contains compositions: (A) a surfactant selected from the following (A1) to (A3); and (B) a polymer selected from the following (B1) to (B2) and (C) water. Therein: the (A1) is an amphoteric surfactant; the (A2) is a nonionic surfactant having a sugar and / or a polyethylene glycol in a hydrophilic group and an alkyl group or a higher fatty acid in a hydrophobic group; the (A3) is a glutamic acid-based, sulfonate-based or sulfonic acid-based anionic surfactant; the (B1) is a polymer whose thickening mechanism is microgel formation; and the (B2) is a polymer having one or two more monomers selected from acrylic acid, an acrylic acid ester, methacrylic acid, a methacrylic acid ester and vinyl neodecanoate.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cleansing agent having an aurora-like appearance. [Background technology]

[0002] Conventionally, water-soluble polymers (polymers) may be blended as thickeners in detergents. Water-soluble polymers are often blended in order to prevent separation of ingredients and stabilize the product system, to impart viscosity to liquid detergents to prevent dripping and improve usability, to improve foam retention and foam quality during washing, and to prevent necessary ingredients from remaining and moisturize after washing. For example, Patent Document 1 discloses a transparent detergent composition comprising component (A): a higher fatty acid salt with a neutralization rate of 100%, component (B): an amphoteric surfactant, component (C): an anionic thickener containing (meth)acrylic acid as a monomer component, component (D): a nonionic thickener and / or an acidic polysaccharide thickener, and component (E): a water-insoluble powder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-098449 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, no attempt has been made to produce a cleansing agent that has an excellent appearance (aurora-like appearance) that appears colorful under white light even without the inclusion of a dye. The present invention has been made by identifying this as a new problem, and aims to provide a cleansing agent that has an excellent appearance. [Means for solving the problem]

[0005] As a result of intensive research, the present inventors have found that a cleansing agent having an aurora-like appearance can be prepared by combining a specific surfactant selected from the following (A1) to (A3) with a specific water-soluble polymer selected from the following (B1) to (B2). Based on this finding, the present inventors have completed the following inventions.

[0006] (1) The cleansing agent according to the present invention contains, as component (A), a surfactant selected from the following (A1) to (A3), as component (B) a polymer selected from the following (B1) to (B2), and as component (C) water; (A1) an amphoteric surfactant, (A2) a nonionic surfactant having a saccharide and / or polyethylene glycol in the hydrophilic group and an alkyl group or a higher fatty acid in the hydrophobic group; (A3) Anionic surfactants based on glutamic acid, sulfonate or sulfate, (B1) A polymer whose thickening mechanism is microgel formation; (B2) A polymer having one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate.

[0007] (2) In the present invention, the cleanser may contain 2.195% by weight or more and less than 9.474% by weight of the component (B) polymer, or 18.54 parts by weight or more and less than 80 parts by weight of the component (B) polymer per 100 parts by weight of the component (A) surfactant.

[0008] (3) In the present invention, the cleanser may contain more than 1.32% and less than 22.37% by mass of the component (A) surfactant, or more than 0.42 parts by weight and less than 7.08 parts by weight of the component (A) surfactant per part by weight of the component (B) polymer.

[0009] (4) In the present invention, the cleansing agent may have an absolute color difference Δb* between the cleansing agent and purified water, with respect to the b* value in the L*a*b* color system, of 2.4 or more. Effect of the Invention

[0010] According to the present invention, it is possible to obtain a cleansing agent having an excellent appearance, such as appearing to have a color under white light without containing a colorant, or appearing to have a color different from that of the light irradiated. Such an excellent appearance is expected to have a high appeal to consumers, particularly in body cleansing agents such as body soap and shampoo (cleaning agents classified as cosmetics), and can contribute to improving the product value. [Brief description of the drawings]

[0011] [Figure 1] 1 is a table showing the raw materials used in the present example. In the figure, percentages (%) indicate "mass %". [Diagram 2] Photographs showing the appearance of cleansing agents prepared using different types of surfactants. [Diagram 3] 1 is a photograph showing the appearance of cleansing agents prepared by varying the blend ratio of surfactants. [Figure 4] Photographs showing the appearance of cleansing agents prepared using different types of polymers. [Diagram 5] 1 is a photograph showing the appearance of cleansing agents prepared by varying the blend ratio of polymers. [Figure 6] (I) is a line graph showing the absolute values ​​of color differences ΔL*, Δa*, and Δb* for cleansers made with different hydrogen ion concentrations (pH). (II) is a table showing the values ​​of color differences ΔL*, Δa*, and Δb* for the same samples and the results of visual observation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in detail below.

[0013] In the present invention, "aurora-like appearance" refers to an appearance in which, when viewed under white light, the liquid is transparent (not cloudy) or translucent (low degree of cloudiness) and appears to partially or entirely take on a single color or multiple colors other than white (blue, green, yellow, orange, red, etc.), or an appearance in which the liquid is transparent or translucent and appears to partially or entirely take on a single color or multiple colors different from the color of the irradiated light.

[0014] White light generally refers to "colorless light that does not affect color vision" or "light that is said to be able to reproduce human color vision." Examples of white light include sunlight (daylight), tungsten lamp (incandescent lamp) light (color temperature 2865K), three-wavelength fluorescent lamp light (color temperature 5100K), and white LED light (color temperature 3500-6500K).

[0015] A detergent refers to a product intended to remove dirt. Specific examples of detergents include detergents for use on the skin, such as makeup removers (cleansing), face washes, body soaps, and whole body shampoos, detergents for use on the hair, such as shampoos, as well as oral cleansers, such as toothpastes and mouthwashes, household detergents, such as laundry (clothing) detergents, kitchen detergents, and household detergents, and industrial detergents. Examples of detergent forms include solid and liquid forms. Here, "liquid" refers to a certain degree of fluidity, and includes viscous forms, such as creams, sols, and gels.

[0016] The presence or absence or degree of the aurora-like appearance of the cleanser can be confirmed by visual inspection. It can also be measured using a commercially available colorimeter, for example, as shown in the examples described later. The aurora-like appearance can be said to be an appearance in which the difference in b* value (absolute value of Δb*) of the L*a*b* color system is 0.5 or more, 0.7 or more, 0.9 or more, 1.0 or more, 1.2 or more, 1.4 or more, 1.6 or more, 1.8 or more, 2.0 or more, 2.2 or more, 2.4 or more, 2.6 or more, 2.8 or more, or 3.0 or more when the cleanser and purified water are measured using a spectrophotometer at a wavelength of 400 to 700 nm. In addition, purified water generally refers to water purified by distillation, ion exchange, ultrafiltration, or a combination of these methods from ordinary water (tap water or well water).

[0017] The surfactant of component (A) is selected from the following (A1) to (A3). These components may be used alone or in appropriate combination of two or more kinds; (A1) an amphoteric surfactant, (A2) a nonionic surfactant having a saccharide and / or polyethylene glycol in the hydrophilic group and an alkyl group or a higher fatty acid in the hydrophobic group; (A3) Anionic surfactants based on glutamic acid, sulfonate or sulfate.

[0018] The (A1) amphoteric surfactant may be any surfactant whose hydrophilic group charge changes depending on pH or the presence of other ionic compounds, and which exhibits the properties of an anionic surfactant on the alkaline side (low hydrogen ion concentration) and a cationic surfactant on the acidic side (high hydrogen ion concentration). Specific examples of amphoteric surfactants include carboxybetaine-type amphoteric surfactants and glycine-type (imidazoline-type) amphoteric surfactants. More specific examples include alkyl betaines (alkyl dimethyl amino acetic acid betaines, alkyl dimethyl acetic acid betaines, alkyl dimethyl carboxymethyl betaines, alkyl dimethyl carboxymethylene ammonium betaines, alkyl dimethyl ammonio acetates, etc.), fatty acid amidopropyl betaines (fatty acid amidopropyl dimethyl amino acid betaines, alkyl yl amidopropyl dimethyl glycines, alkyl yl amidopropyl dimethyl ammonio acetates, etc.), alkyl diethylene triamino acetic acids (alkyl diaminoethyl glycines, etc.), and dialkyl diethylene triamino acetic acids (dialkyl diaminoethyl glycines, etc.). These amphoteric surfactants may be blended in the cleansing agent either alone or in combination of two or more kinds.

[0019] (A2) The nonionic surfactant may be any nonionic surfactant having a saccharide and / or polyethylene glycol (PEG) in the hydrophilic group and an alkyl group or higher fatty acid in the hydrophobic group. Specific examples of such nonionic surfactants include alkyl glucosides (decyl glucoside, lauryl glucoside, octyl glucoside, etc.), PEG-40 stearate, sorbitan oleate, and PEG-80 sorbitan laurate. These nonionic surfactants may be blended in the cleansing agent alone or in combination of two or more.

[0020] (A3) Anionic surfactant may be a glutamic acid, sulfonate or sulfate anionic surfactant. Specifically, sulfonate anionic surfactants include, for example, sulfonates (α-olefin sulfonates, linear alkylbenzene sulfonates, α-sulfo fatty acid methyl ester salts, dialkyl sulfosuccinates, alkanesulfonates, etc.), N-acyltaurate salts, sulfate anionic surfactants include, for example, alkyl sulfates (alkyl sulfates, alkyl ether sulfates, etc.), and glutamic acid anionic surfactants include, for example, N-acyl glutamate salts. These anionic surfactants may be blended into the cleansing agent alone or in combination of two or more.

[0021] The content of the surfactant (A) is not particularly limited as long as the cleanser has an aurora-like appearance. Specific surfactant (solid content) content includes, for example, lower limit of 1% by mass or more, 1.1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, more than 1.32% by mass, 1.4% by mass or more, 1.5% by mass or more, 1.7% by mass or more, 2.0% by mass or more, 2.2% by mass or more, 2.5% by mass or more, 2.7% by mass or more, 3.0% by mass or more, 3.2% by mass or more, 3.5% by mass or more, 3.7% by mass or more, etc. Examples of upper limit include 30% by mass or less, 29% by mass or less, 28% by mass or less, 27% by mass or less, 26% by mass or less, 25% by mass or less, 24% by mass or less, 23% by mass or less, 22% by mass or less, 21% by mass or less, 20% by mass or less, 19% by mass or less, etc.

[0022] Alternatively, the lower limit of the content of component (A) surfactant (solid content) can be, for example, 0.3 parts by weight or more, 0.4 parts by weight or more, more than 0.42 parts by weight, 0.5 parts by weight or more, 0.6 parts by weight or more, 0.7 parts by weight or more, 0.8 parts by weight or more, 0.9 parts by weight or more, 1.0 parts by weight or more, 1.1 parts by weight or more, or 1.2 parts by weight or more, per 1 part by weight of the polymer. Furthermore, examples of the upper limit include 8.0 parts by weight or less, 7.9 parts by weight or less, 7.8 parts by weight or less, 7.7 parts by weight or less, 7.6 parts by weight or less, 7.5 parts by weight or less, 7.4 parts by weight or less, 7.3 parts by weight or less, 7.2 parts by weight or less, 7.1 parts by weight or less, 7.0 parts by weight or less, 6.9 parts by weight or less, 6.8 parts by weight or less, 6.7 parts by weight or less, 6.6 parts by weight or less, 6.5 parts by weight or less, 6.4 parts by weight or less, 6.3 parts by weight or less, and 6.2 parts by weight or less, per 1 part by weight of the polymer.

[0023] The polymer of component (B) is selected from the following (B1) and (B2). These components may be used alone or in appropriate combination of two or more kinds; (B1) A polymer whose thickening mechanism is microgel formation; (B2) A polymer having one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate.

[0024] (B1) Polymers with microgel formation as thickening mechanism are polymers that absorb water by neutralization, swell and form minute gel particles (microgels). This polymer thickens by reducing the volume of low-viscosity liquid (water) due to the thickening mechanism. Specific examples of (B1) polymers include acrylic acid-based polymers, and more specific examples include polymers, copolymers or crosspolymers having one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters and vinyl neodecanoate. The (B1) polymers may be blended in a single type or in a combination of two or more types in the cleanser.

[0025] Examples of the polymer (B2) include polymers and crosspolymers having one monomer selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate, and copolymers and crosspolymers having two or more monomers selected from these. More specifically, examples of the polymer (B2) include acrylates copolymers and (acrylates / vinyl neodecanoate) crosspolymers. The polymer (B2) may be blended in the cleansing agent alone or in combination of two or more.

[0026] The content of the component (B) polymer is not particularly limited as long as the cleanser has an aurora-like appearance.Specific examples of the content of the polymer (solid content) include lower limits of 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.4% by mass or more, 0.6% by mass or more, 0.8% by mass or more, 1.0% by mass or more, 1.2% by mass or more, 1.4% by mass or more, 1.6% by mass or more, 1.8% by mass or more, 2.0% by mass or more, 2.1% by mass or more, 2.195% by mass or more, 2.2% by mass or more, 2.4% by mass or more, and 2.6% by mass or more. Furthermore, examples of the upper limit include 20 mass% or less, 19 mass% or less, 18 mass% or less, 17 mass% or less, 16 mass% or less, 15 mass% or less, 14 mass% or less, 13 mass% or less, 12 mass% or less, 11 mass% or less, 10 mass% or less, 9 mass% or less, and 8 mass% or less.

[0027] Alternatively, the lower limit of the content of component (B) polymer (solid content) can be 0.1 part by weight or more, 0.5 parts by weight or more, 1.0 part by weight or more, 1.5 parts by weight or more, 2.0 parts by weight or more, 4.0 parts by weight or more, 6.0 parts by weight or more, 8.0 parts by weight or more, 10 parts by weight or more, 12.0 parts by weight or more, 14.0 parts by weight or more, 16.0 parts by weight or more, 18.0 parts by weight or more, 20.0 parts by weight or more, 22.0 parts by weight or more, and the like, relative to 100 parts by weight of the surfactant. Furthermore, examples of the upper limit include 100 parts by weight or less, 95 parts by weight or less, 90 parts by weight or less, 85 parts by weight or less, 80 parts by weight or less, 79 parts by weight or less, 78 parts by weight or less, 77 parts by weight or less, 76 parts by weight or less, 75 parts by weight or less, 74 parts by weight or less, 73 parts by weight or less, 72 parts by weight or less, 71 parts by weight or less, 70 parts by weight or less, 69 parts by weight or less, 68 parts by weight or less, 67 parts by weight or less, and 66 parts by weight or less, relative to 100 parts by weight of the surfactant.

[0028] The cleansing agent of the present invention can be produced by mixing components (A), (B) and (C) according to a conventional method. The hydrogen ion concentration can be adjusted by adding an aqueous solution of sodium hydroxide or citric acid as appropriate. For example, as shown in the examples described below, a production procedure can be exemplified in which the components (B) polymer and (C) water are mixed, and while stirring, the surfactant (A) is added and mixed.

[0029] The cleansing agent of the present invention may contain ingredients other than (A), (B) and (C) within the scope of not impairing the effects of the present invention. Examples of such other ingredients include solvents or dispersion media, polyhydric alcohols such as ethanol, glycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol and pentylene glycol, sugars such as sorbitol, surfactants, oily raw materials, pH adjusters, colorants, animal and plant extracts, vitamins and derivatives thereof, chelating agents, inorganic or organic salts, solubilizers, preservatives, bactericides, humectants, ultraviolet scattering agents, ultraviolet absorbing agents, thickeners, fragrances, cationic polymers, refreshing agents, cooling agents, etc., and these other ingredients may be added during or after the preparation of the cleansing agent as necessary.

[0030] The present invention will be described below based on examples. It should be noted that the technical scope of the present invention is not limited to the characteristics shown in these examples. EXAMPLES

[0031] <Test Method> (1) Raw materials used In this example, a cleansing agent was prepared using the ingredients shown in FIG. 1 (all commercially available products).

[0032] (2) Preparation of liquid detergent The cleaning agent was prepared by first diluting the polymer with purified water, adding the surfactant while stirring, and mixing until homogeneous. If necessary, the hydrogen ion concentration (pH) was adjusted by adding an aqueous solution of sodium hydroxide (concentration 10% by weight) and / or an aqueous solution of citric acid (concentration 10% by weight). The formulation is shown in each example.

[0033] (3) Evaluation A white LED (GENTOS Penlight SNM-142D, Gentos, brightness: approximately 200 lumens, luminance: approximately 1025 candelas) was shone from directly above, and the cleanser was visually observed and photographed, and then rated on a four-point scale according to the following criteria. ★★★: Aurora-like appearance is clearly visible ★★: Aurora-like appearance is clearly visible ★: Aurora-like appearance can be seen ×: Aurora-like appearance cannot be seen

[0034] <Example 1> Examination of types of surfactants The 19 types of surfactants shown in Table 2 and acrylates copolymer (product (A)) were used as the polymer to prepare cleansing agents No. 1 to 16 according to the formulations shown in Table 1, and the presence or absence of an aurora-like appearance was evaluated by visual observation. The results are shown in Table 2 and Figure 2. [Table 1]

[0035] [Table 2]

[0036] As shown in Table 2 and Figure 2, all of Nos. 1 to 3 had an aurora-like appearance. That is, all of the cleansers containing cocamidopropyl betaine, lauramidopropyl betaine, or sodium cocoamphoacetate had an aurora-like appearance. This result demonstrated that amphoteric surfactants can be used to create cleansers with an aurora-like appearance.

[0037] Additionally, all of Nos. 4 to 6 had an aurora-like appearance, whereas no aurora-like appearance was observed in Nos. 7 and 8. In other words, the cleanser containing a nonionic surfactant with glycerin in the hydrophilic group did not have an aurora-like appearance, but all of the nonionic surfactants with sugars and / or polyethylene glycol (PEG) in the hydrophilic group and alkyl groups or higher fatty acids in the hydrophobic group had an aurora-like appearance. These results demonstrate that a cleanser with an aurora-like appearance can be produced by using a nonionic surfactant with sugars and / or PEG in the hydrophilic group and alkyl groups or higher fatty acids in the hydrophobic group.

[0038] Additionally, while Nos. 12 to 18 all had an aurora-like appearance, no aurora-like appearance was observed in Nos. 9 to 11 and No. 19. In other words, all of the cleansers containing N-acyl glutamate (glutamic acid-based), sulfonate-based, or sulfate-based anionic surfactants had an aurora-like appearance. These results demonstrate that glutamic acid-based, sulfonate-based, or sulfate-based anionic surfactants can be used to create cleansers with an aurora-like appearance.

[0039] Example 2: Examination of the amount of surfactant used Cleansing agents, Samples No. 1 to 8, were prepared by varying the amount of surfactant blended between 1.25 and 7.08 parts by weight per part by weight of polymer. The surfactant used was sodium caproyl methyl taurate, and the polymer used was acrylates copolymer (Product (A)). The blending ratios are shown in Table 3. Next, these cleansing agents were visually evaluated for the presence or absence of an aurora-like appearance. The results are shown in Table 3 and Figure 3. [Table 3]

[0040] As shown in Table 3 and Figure 3, all of Nos. 1 to 8 had an aurora-like appearance. Among them, Nos. 2 to 8 had a strong aurora-like appearance, and Nos. 4 to 6 had a prominent aurora-like appearance. From these results, it became clear that a cleanser with an aurora-like appearance can be produced regardless of the surfactant content.

[0041] Example 3: Examination of polymer types Using sodium caproyl methyl taurate as the surfactant and the five types of polymers shown in Table 4, cleansers No. 1 to No. 5 were prepared with the formulations shown in Table 1, and the presence or absence of an aurora-like appearance was evaluated by visual observation. The results are shown in Table 4 and Figure 4. [Table 4]

[0042] As shown in Table 4 and Figure 4, all of Nos. 1 to 4 had an aurora-like appearance, but No. 5 had no visible aurora-like appearance. In other words, the cleanser containing a polymer with an "associative thickening mechanism" had no visible aurora-like appearance, but the cleanser containing a polymer with a microgel-forming thickening mechanism had an aurora-like appearance. In addition, the cleanser containing a "polymer with one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate" had an aurora-like appearance. From these results, it was revealed that a cleanser with an aurora-like appearance can be produced using a "polymer with a microgel-forming thickening mechanism" or a "polymer with one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate."

[0043] Example 4: Examination of polymer blend amount Samples No. 1 to 10 were prepared by varying the amount of polymer blended between 0.14 and 80 parts by weight per 100 parts by weight of surfactant. The surfactant used was sodium caproyl methyl taurate, and the polymer used was acrylates copolymer (product (A)). Next, the presence or absence of an aurora-like appearance was evaluated by visual observation for these cleansers. The blends and evaluation results for No. 1 to 10 are shown in Table 5 and Figure 5. [Table 5]

[0044] As shown in Table 5 and Figure 5, all of Nos. 1 to 10 had an aurora-like appearance. Among them, Nos. 2 to 6 had a strong aurora-like appearance, and Nos. 3 to 5 had a prominent aurora-like appearance. From these results, it became clear that a cleanser with an aurora-like appearance can be produced regardless of the polymer content.

[0045] Example 5: Examination of color difference A cleansing agent was prepared using sodium caproyl methyl taurate as a surfactant and an acrylates copolymer (product (A)) or an (acrylates / vinyl neodecanoate) crosspolymer as a polymer, and the pH was adjusted to various values ​​between 5.97 and 7.33 to give samples No. 1 to 7. The formulations and pH are shown in Table 6. Next, the presence or absence of an aurora-like appearance of samples No. 1 to 7 was evaluated by visual observation, and measurements were taken at wavelengths of 400 to 700 nm (10 nm intervals) using a spectrophotometer (CM-700d, Konica Minolta) to obtain measured values ​​(L*, a*, b*) in the L*a*b* color system. Purified water was also measured in the same manner, and the measured values ​​of purified water were subtracted from the measured values ​​of samples No. 1 to 7 to calculate the color differences ΔL*, Δa*, and Δb*. The results are shown in Table 6 and Figure 6. [Table 6]

[0046] As shown in Table 6 and FIG. 6, visual observation correlated that the higher the pH, the less severe the aurora-like appearance, and the lower the pH, the more pronounced the aurora-like appearance.

[0047] On the other hand, the color difference measurements showed that the ΔL* and Δa* values ​​were almost constant regardless of the appearance and pH of the cleanser. In contrast, the Δb* value was correlated with the degree of the aurora-like appearance of the cleanser, decreasing as the pH increased and increasing as the aurora-like appearance increased or the pH decreased. In other words, it was revealed that the b* value, which represents the intensity of the color from blue to yellow, fluctuates greatly in cleansers that have an aurora-like appearance, compared to purified water.

[0048] These results show that the absolute value of the Δb* value is an index of the aurora-like appearance. In addition, the minimum Δb* value of samples No. 1 to 7 was 2.41, and an aurora-like appearance was visible, so it was revealed that an aurora-like appearance can be obtained by setting the absolute value of the Δb* value of the cleanser to 2.4 or more.

Claims

1. A cleansing agent comprising: (A) a surfactant selected from the following (A1) to (A3); (B) a polymer selected from the following (B1) to (B2); and (C) water; (A1) an amphoteric surfactant, (A2) a nonionic surfactant having a saccharide and / or polyethylene glycol in the hydrophilic group and an alkyl group or a higher fatty acid in the hydrophobic group; (A3) anionic surfactants of the glutamic acid type, sulfonate type or sulfate type, (B1) a polymer whose thickening mechanism is microgel formation; (B2) A polymer containing one or more monomers selected from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, and vinyl neodecanoate.

2. 2. The cleansing agent according to claim 1, comprising the (B) polymer in an amount of 2.195% by mass or more and less than 9.474% by mass, or comprising the (A) surfactant in an amount of 18.54 parts by mass or more and less than 80 parts by mass per 100 parts by weight of the (A) surfactant.

3. The cleansing agent according to claim 1, comprising more than 1.32% by mass and less than 22.37% by mass of the (A) surfactant, or more than 0.42 parts by mass and less than 7.08 parts by mass of the (B) surfactant per 1 part by weight of the polymer.

4. 2. The cleansing agent according to claim 1, wherein the absolute value of the color difference Δb* from purified water in terms of the b* value of the L*a*b* color system is 2.4 or more.

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