Bath additives based on crystalline particles

Abstract

To provide a bath additive that uses crystalline particles containing oily components as a base, while maintaining its appearance (crystal-like appearance) and having low adhesion. [Solution] A bath additive containing the following components (A), (B), (C), and (D): (A) 10% crystalline particles with a particle diameter of 0.4 mm or more, (B) an oily component, (C) aluminum corn starch octenyl succinate, and (D) a nonionic surfactant.

Description

Technical Field

[0001] The present invention relates to a bath agent based on crystal particles.

Background Art

[0002] Bath agents come in various forms such as liquid, powder, briquette, and particle forms. Among these, as a particulate bath agent, a bath agent based on crystal particles having a certain size and a transparent to translucent appearance is preferred because it looks good in appearance and is easy to handle.

[0003] In recent years, bath agents are required to have effects such as moisturizing and fragrance, either alone or in combination with a warming effect. The effects of moisturizing and fragrance can be achieved by blending oily components having those effects into the bath agent. However, in order to blend oily components into a bath agent based on crystal particles without impairing the properties and handling convenience of the bath agent, it is preferable to integrate the oily components with the crystal particles. Therefore, coating the surface of the crystal particles with an oily component has been carried out (Patent Document 1).

[0004] Thus, when coating the surface of crystal particles with an oily component, only the oily component causes stickiness on the particle surface and the particles adhere to each other, resulting in a decrease in fluidity. Therefore, in order to improve fluidity during production and enhance productivity, fumed silica is blended into the composition containing the oily component used for the coating to absorb the oily component into the fumed silica (Patent Documents 1 and 2).

[0005] However, in crystal particles characterized by appearance properties (crystal feeling), when fumed silica is blended, the surface of the crystal particles is coated with fumed silica, and the crystal feeling is inhibited. In addition, fumed silica is difficult to dissolve in hot water, so it floats on the surface of the hot water and does not dissolve even when stirred, which may give the user an unpleasant feeling.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Patent No. 5650434 [Patent Document 2] Japanese Patent Publication No. 2020-164423 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the past, it has been difficult to provide a bath additive that uses crystalline particles containing oily components (including fragrances) as a base while maintaining its appearance (crystal-like appearance) and having low adhesion (high productivity due to less adhesion to the inside of production equipment). [Means for solving the problem]

[0008] As a result of diligent research to solve the aforementioned problems, we discovered that by incorporating an oily component into a bath additive based on crystalline particles, and using aluminum corn starch octenyl succinate as an adhesion-improving component, it is possible to obtain a bath additive with low adhesion while maintaining its appearance (crystal-like appearance), thus completing the present invention.

[0009] Therefore, the present invention encompasses the following embodiments: [1] The following components (A), (B), (C), and (D): (A) Crystal grains with a 10% particle diameter of 0.4 mm or larger, (B) Oily component, (C) Corn starch aluminum octenyl succinate, and (D) Nonionic surfactant A bath additive containing [ingredient]. [2] The bath additive according to [1], wherein component (A) is crystalline particles comprising at least one selected from the group consisting of sodium chloride, magnesium sulfate, aluminum potassium sulfate, potassium chloride, magnesium chloride, and sodium sulfate, and their hydrates. [3] The bath additive according to [1] or [2], wherein component (B) is an oily component containing a fragrance. [4] A bath additive according to any one of [1] to [3], wherein the overall HLB (hydrophilic-lipophilic balance) of the nonionic surfactant of component (D) is 12 or more.

[0010] [5] The following components (A), (B), (C), and (D): (A) Crystal grains with a 10% particle diameter of 0.4 mm or larger, (B) Oily component, (C) Corn starch aluminum octenyl succinate, and (D) Nonionic surfactant A method for producing a bath additive, characterized by including a step of mixing the following. [Effects of the Invention]

[0011] The present invention provides a bath additive based on crystalline particles that has a good appearance (crystal-like appearance) and low adhesion (good productivity) while incorporating oily components (including fragrance). [Brief explanation of the drawing]

[0012] [Figure 1] These are photographs showing only the raw materials (crystalline particles), as well as the appearance of the bath additives of Example 1 and Comparative Example 1. [Figure 2] These are photographs showing the appearance of the bath additives of Example 4 and Comparative Example 1. [Modes for carrying out the invention]

[0013] The bath additive according to the present invention is a bath additive based on crystalline particles, and contains the following components (A) to (D): (A) Crystal grains with a 10% particle diameter of 0.4 mm or larger, (B) Oily component, (C) Corn starch aluminum octenyl succinate, and (D) Nonionic surfactant It includes [the following]. Each component will be explained in detail below.

[0014] (A) Crystalline grains with a 10% particle size of 0.4 mm or larger The crystal particles are used as a base (main component) of the bath agent and are water-soluble crystal particles. The 10% particle size of the crystal particles is 0.4 mm or more, preferably 1 mm or more. Also, the upper limit of the 10% particle size is a particle size that is possible to manufacture and is not particularly limited, but is approximately 10 mm.

[0015] The particle size is a value obtained from the mesh size of the sieve. For example, particles with a particle size of 0.4 mm or more refer to particles that do not pass through a sieve with a mesh size of less than 0.4 mm. Also, the 10% particle size is the particle size at which the proportion of particles with a particle size less than or equal to that particle size is 10% of the total volume of the particles. For example, when the 10% particle size is 0.4 mm or more, it means that more than 10% of the total volume of the particles have a particle size of 0.4 mm or more.

[0016] When the 10% particle size is 0.4 mm or more, it can exhibit an appearance with a crystal feeling and can give a different purchasing desire from the powdery bath agent. Also, it easily dissolves in water.

[0017] The crystal particles contain, as components, inorganic salts and / or their hydrates. Examples of the inorganic salts and their hydrates include sodium chloride, magnesium sulfate, potassium aluminum sulfate, potassium chloride, magnesium chloride, sodium sulfate, and their hydrates. Sodium chloride, magnesium sulfate, potassium aluminum sulfate, and their hydrates are preferred, and sodium chloride, magnesium sulfate heptahydrate (epsom salt), and potassium aluminum sulfate dodecahydrate are more preferred.

[0018] These inorganic salts and their hydrates may be used alone or in combination of two or more. Also, these inorganic salts and their hydrates may be purified or may contain other components such as sea salt, rock salt, and bittern (however, it is preferable that the content of the inorganic salts and their hydrates is 90% by mass or more).

[0019] The crystalline particles of component (A) can be prepared by methods known in the art. They can also be obtained commercially.

[0020] The content of component (A) is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more, based on the total mass of all components of the bath additive.

[0021] (B) Oily component The oily components are preferably liquid at room temperature. The oily components are preferably fragrances to diffuse a scent in the bathwater and bathroom, thereby enhancing the bathing effect. Other oily components besides fragrances are mainly added to moisturize the skin, and also have the effect of retaining the fragrance, thus preventing the fragrance from evaporating easily from the bathwater.

[0022] Oily components include, for example, natural oils and fats such as soybean oil, rice bran oil, jojoba oil, avocado oil, almond oil, olive oil, rosehip oil, camellia oil, cocoa butter, shea butter, sesame oil, peach kernel oil, castor oil, coconut oil, mink oil, beef tallow, and lard; hydrogenated oils obtained by hydrogenating these natural oils and fats; synthetic glycers and diglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride; waxes such as carnauba wax, whale wax, beeswax, and lanolin; hydrocarbons such as liquid paraffin, petrolatum, paraffin, light isoparaffin, microcrystalline wax, ceresin, squalane, and pristane; lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, and linoleic acid. Higher fatty acids such as seroyl acid, linolenic acid, lanolinic acid, and isostearic acid; higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, cholesterol, and 2-hexyldecanol; esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate (isooctyl palmitate (IOP)), isopropyl adipate, butyl stearate, decyl oleate, and cholesterol isostearate; silicone oils such as methylpolysiloxane, methylcyclopolysiloxane, methylhydrogenpolysiloxane, and methylphenylpolysiloxane; and Lemon oil, yuzu oil, rose oil, bergamot oil, calamus oil, lavender oil, orange oil, grapefruit oil, mandarin oil, geranium oil, sage oil, eucalyptus oil, neroli oil, patchouli oil, clove oil, nutmeg oil, cedarwood oil, peppermint oil, spearmint oil, juniper berry oil, armois oil, chamomile oil, elemi oil, vetiver oil, camphor oil, lime oil, peppermint oil, jasmine oil, cypress oil, turpentine oil, hinoki oil, lavandin oil, clove oil, thyme oil, rosemary oil, pine oil, ylang-ylang oil, and other natural fragrances derived from herbs; Terpene-based fragrances such as α-pinene, β-pinene, d-limonene, camphene, terpinene; green leaf alcohol, sandalol, evanol, ambrinol, ambercore, citronellol, geraniol, nerol, linalool, tetrahydrolinalool, dihydromyrcenol, ethyllinalool, isopulegol, menthol, terpineol, dihydroterpineol, farnesol, santalol, vetiverol, β-phenylethyl alcohol, bacdanol, and other alcohol-based fragrances; aldehyde C-8, aldehyde C-9, aldehyde C-10, aldehyde Synthetic fragrances such as aldehyde C-11, aldehyde C-12, leaf aldehyde, citronellal, citral, α-methylenecitronellal, isocyclocitral, dimethyltetrahydrobenzaldehyde, benzaldehyde, phenylacetaldehyde, α-amyl cinnamic aldehyde, α-hexyl cinnamic aldehyde, vanillin, ethyl vanillin, heliotropin, helional, cis-jasmone, dihydrojasmone, nectaril, damascone, ionone, iso-E-super, caron, l-carbone, menthone, and other aldehyde / ketone-based fragrances; Examples include blended fragrances obtained by arbitrarily combining the aforementioned natural and synthetic fragrances.

[0023] The above oily components may be used individually or in combination of two or more. The proportion of fragrance in component (B) is preferably 50% by mass, more preferably 70% by mass or more, and even more preferably 90% by mass or more, in order to obtain sufficient bathing effects from the fragrance.

[0024] Oily components can also be prepared by methods known in the art, or they are available commercially.

[0025] The content of component (B) is preferably 0.1% by mass or more, more preferably 0.1 to 2% by mass, and even more preferably 0.1 to 1% by mass, based on the total mass of all components of the bath additive. If the blending ratio of component (B) is less than 0.1% by mass, it becomes difficult to obtain the fragrance effect of the bath additive.

[0026] (C) Aluminum (Al) Corn Starch Octenylsuccinate Aluminum corn starch octenyl succinate is a white powder component commonly used as an adsorbent in cosmetics and quasi-drugs. Aluminum corn starch octenyl succinate can be prepared by methods known in the art or is available commercially.

[0027] The content of component (C) is preferably such that it exhibits an effect of improving adhesion, and is preferably 0.1% by mass or more (for example, 0.1 to 2% by mass), and more preferably 0.3% by mass or more (for example, 0.3 to 1% by mass), relative to the total mass of all components of the bath additive.

[0028] (D) Nonionic surfactant Nonionic surfactants are a type of surfactant that have a hydrophilic group containing a group (such as a hydroxyl group or ether bond) that does not dissociate into an ion when dissolved in water. In the bath additive according to the present invention, the nonionic surfactant of component (D) preferably has the effect of reducing insoluble substances by dispersing the water-insoluble component (C) (aluminum corn starch octenyl succinate) in the hot water. In one embodiment, it is preferable to use a nonionic surfactant having an HLB (Hydrophile-lipophile balance value; hydrophilic-lipophilic balance) of 12 or more.

[0029] HLB is a value (1-20) that can be calculated using the following Griffin formula. HLB = 20 × (1 - S / A) [In the formula, S is the saponification value of the ester, and A is the acid value of the fatty acid.]

[0030] Regarding HLB, when a single nonionic surfactant is used as component (D), it refers to the HLB value of that single surfactant. When two or more nonionic surfactants are used in combination, it refers to the HLB value of all of these multiple nonionic surfactants, which is determined based on Griffin's formula and the respective content of each surfactant. The total HLB of component (D) is preferably 12 or higher, more preferably 13 or higher, and even more preferably 14 or higher, from the viewpoint of reducing discomfort during bathing.

[0031] Such nonionic surfactants are not particularly limited as long as they are nonionic surfactants that are conventionally used in the fields of cosmetics and quasi-drugs. Examples include polyoxyethylene (caprylic / capric acid) glyceryl (HLB: 14), polyoxyethylene hydrogenated castor oil (EO60) (HLB: 14), polyoxyethylene sorbitan monolaurate (Tween20, polysorbate 20) (HLB: 16.7), polyoxyethylene sorbitan palmitate (Tween40, polysorbate 40) (HLB: 15.6), polyoxyethylene sorbitan stearate (Tween60, polysorbate 60) (HLB: 14.9), and polyoxyethylene sorbitan oleate (Tween80, polysorbate 80) (HLB: 15.0).

[0032] Nonionic surfactants may be used individually or in combination of two or more. Even if a nonionic surfactant alone has an HLB of less than 12, if the combination with other nonionic surfactants results in an overall HLB of 12 or more, then such combination can be used.

[0033] The content of component (D) is preferably 0.1% by mass or more, more preferably 0.1 to 2% by mass, and even more preferably 0.1 to 1% by mass, based on the total mass of all components of the bath additive. If the proportion of component (D) is less than 0.1% by mass, the dispersion of aluminum corn starch octenyl succinate in water may be insufficient. When the proportion of component (D) is within the above range, sufficient dispersion of aluminum corn starch octenyl succinate in water is obtained, and storage stability is also good.

[0034] (E) Other ingredients The bath additive according to the present invention may contain other components besides those listed above. Examples of such other components include inorganic salts, inorganic acids, organic acids, polyhydric alcohols, plant components, preservatives and stabilizers, chlorine removers, disinfectants, vitamins, moisturizing components, anti-inflammatory agents, dyes, pigments, and other components commonly used in bath additives, and can be appropriately selected within a range that does not impair the effects of the present invention.

[0035] In one embodiment, as other components, for example, amino acids other than amino acid salts and hydrates can be added as chlorine removers. Examples of such amino acids include glycine, alanine, and glutamic acid, with glycine being preferred. If the amino acids are salts and hydrates, the moisture balance of the particles is easily disrupted, which can worsen the storage stability of the bath additive. The content of such amino acids is preferably 0.1% by mass or more, more preferably 0.1 to 2% by mass, and even more preferably 0.1 to 0.5% by mass, based on the total mass of all components of the bath additive. If the amino acid content is less than 0.1% by mass, the chlorine removal effect is insufficient. Within the above range, a sufficient chlorine removal effect is obtained, and storage stability is also good.

[0036] The bath additive according to the present invention can be manufactured by conventional methods. For example, the bath additive can be manufactured by adding each component together or in stages to a mixer (e.g., a V-type mixer) that is conventionally used for manufacturing particulate bath additives, and then stirring and mixing them at conventional temperatures and stirring speeds.

[0037] Therefore, in one embodiment, the present invention comprises the following components (A), (B), (C), and (D): (A) Crystal grains with a 10% particle diameter of 0.4 mm or larger, (B) Oily component, (C) Corn starch aluminum octenyl succinate, and (D) Nonionic surfactant The present invention provides a method for producing bath additives, characterized by including a step of mixing the following: [Examples]

[0038] The present invention will now be described in more detail with reference to examples, but the present invention is not limited thereto.

[0039] <Examples 1-4 and Comparative Examples 1-3> 1. Preparation of bath additives The bath additives for Examples 1-4 and Comparative Examples 1-3 were prepared by stirring each ingredient in a mixer, such as a V-type mixer, according to the formulations listed in Table 1. Specifically, the following ingredients were used. Ingredient (A): Magnesium sulfate heptahydrate (manufactured by Akaho Chemical Co., Ltd.) Sodium chloride (sea salt): (Manufactured by Akaho Chemical Co., Ltd.) Ingredient (B): Fragrance: Lemongrass fragrance (manufactured by Takasago International Corporation) Ingredients (C): Aluminum corn starch octenyl succinate (manufactured by Nippon Denki Chemical Co., Ltd.) Anhydrous silicic acid: Silopure 25 (manufactured by Fuji Silicia Chemical Co., Ltd.) Ingredients (D): Polyoxyethylene (caprylic / capric acid) glyceryl (HLB:14): (Manufactured by Watahan Trading Co., Ltd.) Polyoxyethylene hydrogenated castor oil (EO60) (HLB:14): (Manufactured by Nikko Chemicals Co., Ltd.) Polyoxyethylene hydrogenated castor oil (EO20) (HLB: 10.5): (Manufactured by Nikko Chemicals Co., Ltd.) Other ingredients: Glycine: (Manufactured by Resonac Co., Ltd.)

[0040] [Table 1]

[0041] 2. Evaluation Adhesion, crystal-like appearance, and dissolution state were evaluated as follows, and the results are shown in Table 2.

[0042] (1)Adhesion The prepared bath additive was placed in a stainless steel container, and it was checked to ensure that no residue adhered to the container. ◎: No residue at all on the container ○: There is a small amount of residue on the container, which is barely noticeable. △: There is a slight amount of residue on the container. ×: There is a noticeable amount of residue on the container. (10 participants)

[0043] (2) Crystal-like Approximately 100g of bath salts were placed in a beaker, and the crystal-like quality was evaluated according to the following criteria. The final evaluation was based on the average score of all 10 monitors. 3 points: It has a very crystal-like quality and is very appealing. 2 points: It has a crystal-like quality and is attractive. 1 point: It doesn't have much of a crystal-like quality and isn't very appealing. 0 points: Completely lacks any crystal-like quality and is not appealing. (10 participants)

[0044] (3) Dissolution state In a bathtub with 200 liters of water at 40°C, 100g of bath additive was added. Monitors bathed in the bathwater for 10 minutes, and the indissolution of the bath additive on the surface of the water after bathing was evaluated according to the following criteria. The evaluation was based on the average score of all 10 monitors. 3 points: No insoluble matter remained on the surface of the water. 2 points: There was a small amount of insoluble matter remaining on the surface of the water, which was hardly noticeable. 1 point: There was a slight amount of insoluble matter remaining on the surface of the water, which was a bit concerning. 0 points: There was a noticeable amount of insoluble matter remaining on the surface of the water. (10 participants)

[0045] (2) Crystalliness and (3) Dissolution state were evaluated based on the average score of the monitors according to the following criteria. ◎: Average score 2.5 or more and 3 or less ○: Average score of 2 points or more but less than 2.5 points △: Average score between 1.5 and 2 points. ×: Average score less than 1.5 points

[0046] [Table 2]

[0047] The bath additives of Examples 1 to 4 all exhibited good adhesion, crystal-like appearance, and solubility. The bath additives of Examples 1 and 2, which contained 0.25% or 1% by mass of aluminum corn starch octenyl succinate as component (C) and 0.15% or 0.6% by mass of polyoxyethylene (caprylic / capric acid) glyceryl (HLB:14) as component (D), were particularly good.

[0048] Furthermore, Figure 1 shows photographs of the appearance of the bath additives of Example 1 and Comparative Example 1, using only the raw material (crystalline particles) of component (A). As shown in Figure 1, by using aluminum corn starch octenyl succinate as an oil absorbent for the oily component, a bath additive with good adhesion and appearance (crystal-like feel) was obtained.

[0049] In Example 4, a bath additive was prepared and evaluated using sea salt (manufactured by Akaho Chemical Industries, Ltd.) as component (A). A photograph of its appearance is shown in Figure 2. As shown in Figure 2, by using aluminum corn starch octenyl succinate, a bath additive with a good appearance (crystal-like quality) was obtained.

[0050] <Examples 5-6 and Comparative Examples 4-5> 1. Preparation of Epsom salt bath additive Epsom salt bath additives were prepared by mixing each ingredient according to the formulations shown in Table 3.

[0051] 2. Evaluation (1) Physical properties The prepared Epsom salt bath additive was left to stand at room temperature for 7 days, and then evaluated for any aggregation or solidification. (2) Skin irritation After dissolving 30g of prepared Epsom salt bath additive in 200L of 40℃ bathwater, the sensation of irritation to the skin was evaluated using a questionnaire (10 participants). (3) Coloring of bathwater After dissolving 30g of the prepared Epsom salt bath additive in 200L of bathwater at 40℃, the bathwater was visually evaluated to see if it was sufficiently colored by the dye (10 participants).

[0052] [Table 3]

Claims

1. The following components (A), (B), (C), and (D): (A) Crystal grains with a 10% particle diameter of 0.4 mm or more, (B) oily component, (C) Corn starch aluminum octenyl succinate, and (D) Nonionic surfactants A bath additive containing [ingredient].

2. The bath additive according to claim 1, wherein component (A) is crystalline particles comprising at least one selected from the group consisting of sodium chloride, magnesium sulfate, aluminum potassium sulfate, potassium chloride, magnesium chloride, and sodium sulfate, and their hydrates.

3. The bath additive according to claim 1 or 2, wherein component (B) is an oily component containing a fragrance.

4. The bath additive according to claim 1 or 2, wherein the overall HLB (hydrophilic-lipophilic balance) of the nonionic surfactant of component (D) is 12 or more.

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