Carbon dioxide effervescent bath additive

Abstract

To provide a carbon dioxide effervescent bath agent enabling improvement of the concentration of dissolved carbon dioxide in a hot water bath when used in combination with a bath agent including a desired scent, color, and ingredient thereof, and also enabling improvement of the concentration of dissolved carbon dioxide in a hot water bath when used alone, and furthermore enabling recovery of the concentration of dissolved carbon dioxide in a hot water bath by using the carbon dioxide effervescent bath agent more than once.SOLUTION: A carbon dioxide effervescent bath agent according to the present invention is used in combination with at least one ingredient selected from the group consisting of fragrances, coloring matter, and opacifying agents, or a bath agent including the ingredient. The carbon dioxide effervescent bath agent is used by being fed into a hot water bath more than once at intervals.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a carbon dioxide gas foaming bath agent.

Background Art

[0002] A carbon dioxide gas foaming bath agent containing an organic acid and a carbonate, which generates carbon dioxide gas by the reaction of both in bath water, is known to have an excellent blood circulation promoting effect and suppress cooling of the bath water (see Patent Document 1). These carbon dioxide gas foaming bath agents are commercially available with added dyes and fragrances for each product. As the tendency to seek a bath agent with a mind-body fatigue recovery effect increases, the fragrance of the bath agent and the coloring effect by the bath agent have become important factors in the selection of the bath agent. On the other hand, in the carbon dioxide gas foaming bath agent, after being put into the bath, the dissolved carbon dioxide gas concentration in the bath water decreases with the passage of time.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional carbon dioxide gas foaming bath agents have fixed scents and colors, so sufficient satisfaction has not been obtained for demand layers particular about scents and colors. In addition, due to the decrease in carbon dioxide gas over time, there has been a problem that when used by a family, for example, the last person to take a bath cannot obtain a sufficient carbon dioxide gas effect. The present invention aims to provide a carbon dioxide effervescent bath additive that can be used in combination with bath additives containing preferred fragrances, colors, and their components to improve the dissolved carbon dioxide concentration in a bath, and can also improve the dissolved carbon dioxide concentration in a bath when used alone, and can restore the dissolved carbon dioxide concentration in a bath after multiple uses. [Means for solving the problem]

[0005] The present invention includes, for example, the following [1] to [9]. [1] A carbon dioxide effervescent bath additive used in combination with at least one component selected from the group consisting of fragrances, dyes, and opacifying agents, or a bath additive containing the said components. [2] A carbonated effervescent bath additive that is used by adding it to the bathwater multiple times with time intervals in between. [3] A carbonated bath additive containing an organic acid (A) and a carbonate (B), and free from fragrances, dyes, and opacifiers [1] or [2]. [4] The carbonated effervescent bath additive of [3], further containing an oily component (C) that is liquid at 25°C other than fragrance. [5] A carbonated effervescent bath additive in which the organic acid (A) is greater than 20% by mass and 50% by mass or less, and the carbonate (B) is greater than 30% by mass and 70% by mass or less [3] or [4]. [6] A carbon dioxide effervescent bath additive according to any of [3] to [5], wherein the organic acid (A) comprises at least one selected from the group consisting of fumaric acid and succinic acid. [7] A briquette-type effervescent bath additive with a particle size of 3 mm to 6 mm, one of the following [1] to [6]. [8] A carbon dioxide effervescent bath additive in which any of the following [4] to [7] is an oily component (C) that is liquid at 25°C other than the fragrance, selected from the group consisting of liquid paraffin and heavy liquid isoparaffin. [9] A method for restoring the dissolved carbon dioxide concentration in a bath by adding one of the carbon dioxide effervescent bath additives [1] to [8] multiple times with a time interval between baths. [Effects of the Invention]

[0006] The carbon dioxide effervescent bath additive of the present invention can be used in combination with bath additives containing a preferred fragrance, color, and their components to improve the dissolved carbon dioxide concentration in the bathwater. It can also improve the dissolved carbon dioxide concentration in the bathwater on its own, and the dissolved carbon dioxide concentration in the bathwater can be restored by using it multiple times. Furthermore, in a preferred embodiment of the present invention, a carbon dioxide effervescent bath additive that does not contain fragrances, dyes, or opacifying agents does not cause disharmony in color and fragrance with the combined ingredients and the bath additive. [Modes for carrying out the invention]

[0007] A first aspect of the present invention is a carbon dioxide effervescent bath additive used in combination with at least one component selected from the group consisting of fragrances, dyes, and opacifying agents, or a bath additive containing the said components. A second aspect of the present invention is a carbon dioxide effervescent bath additive that is used by adding it to a bath multiple times with time intervals in between. Both the carbon dioxide effervescent bath additive of the first embodiment of the present invention and the carbon dioxide effervescent bath additive of the second embodiment of the present invention preferably contain an organic acid (A) and a carbonate (B), and preferably do not contain fragrances, dyes, or clouding agents, and more preferably contain an oily component (C) other than a fragrance that is liquid at 25°C. Furthermore, it is more preferable that both the carbon dioxide effervescent bath additive of the first embodiment of the present invention and the carbon dioxide effervescent bath additive of the second embodiment of the present invention be briquette-type bath additives with a particle size of 3 mm to 6 mm. Hereinafter, when simply referred to as "carbon dioxide effervescent bath additive," it refers to either the carbon dioxide effervescent bath additive of the first or second embodiment of the present invention. The carbon dioxide effervescent bath additive of the present invention may be classified as a quasi-drug, cosmetic, or general merchandise item.

[0008] <(A) Organic acid> Carbon dioxide effervescent bath additives preferably contain an organic acid (A). Such organic acids are preferably solid at room temperature (25°C), and examples include malic acid, fumaric acid, succinic acid, citric acid, tartaric acid, malonic acid, pyrrolidone carboxylic acid, monosodium citrate, monosodium succinate, monosodium fumarate, adipic acid, tartaric acid, benzoic acid, salicylic acid, glutaric acid, glycolic acid, lactic acid, glyceric acid, pyruvic acid, and the like. There are no particular restrictions on the stereoisomers of malic acid; any of them may be used. These may be used individually or in combination of two or more. In particular, from the viewpoint of ensuring sufficient carbon dioxide generation and maintaining good storage stability, it is preferable to contain at least one selected from the group consisting of fumaric acid, malic acid, and succinic acid, and more preferably at least one selected from the group consisting of fumaric acid and succinic acid. These preferred organic acids do not chelate with metals, thus preventing discoloration of the bathtub.

[0009] The content of organic acid (A) in 100% by mass of the carbon dioxide effervescent bath additive is preferably more than 20% by mass and 50% by mass or less, and more preferably 30-40% by mass. When the amount of organic acid is within the above range, the amount of carbon dioxide is sufficient, the effervescence is good, the storage stability is good, and in the manufacturing process, when a preferred form of briquette is formed, roll adhesion, leakage, cracking, and chipping are less likely to occur during compression molding, and the generation of burrs, etc. is suppressed when crushing, and furthermore, problems with the formation of insoluble matter during use do not occur, which is preferable. When the organic acid contains succinic acid, the succinic acid content in 100% by mass of the carbon dioxide effervescent bath additive is preferably 10 to 30% by mass, and more preferably 15 to 25% by mass. When the amount of succinic acid is within the above range, it is possible to obtain good effervescence while suppressing the coughing sensation characteristic of succinic acid during effervescence.

[0010] <(B) Carbonate> Carbon dioxide effervescent bath additives preferably contain a carbonate (B). Carbonates can generate carbon dioxide together with organic acids (A). Examples of carbonates include dialkali metal carbonates such as sodium carbonate and potassium carbonate; monoalkali metal carbonates such as sodium bicarbonate and potassium bicarbonate; divalent or higher metal carbonates such as magnesium carbonate and calcium carbonate; ammonium carbonate, sodium sesquicarbonate, etc. These may be used individually or in combination of two or more. Among these, at least one selected from the group consisting of sodium carbonate and sodium bicarbonate is preferred from the viewpoint of ease of availability, and it is more preferable to use both sodium carbonate and sodium bicarbonate in combination.

[0011] The carbonate (B) content in 100% by mass of the carbon dioxide effervescent bath additive is preferably more than 30% by mass and 70% by mass or less, and more preferably 40% to 60% by mass. When the amount of carbonate is within the above range, the amount of carbon dioxide is sufficient, resulting in good effervescence and good storage stability. In the manufacturing process, when using the preferred embodiment of the briquette, roll adhesion, leakage, cracking, and chipping are less likely to occur during compression molding, and the generation of burrs, etc., can be suppressed during crushing.

[0012] <Ingredients that are preferably not included> Carbon dioxide effervescent bath additives preferably do not contain fragrances, dyes, or clouding agents. By omitting these components, it is possible to prevent disharmony in the color and scent of the bathwater when used in combination with fragrances, dyes, clouding agents, or bath additives containing these components. Examples of fragrances that are preferably not included include natural fragrances, terpene fragrances, alcohol fragrances, synthetic fragrances such as aldehyde and ketone fragrances, and blended fragrances that arbitrarily combine the aforementioned natural and synthetic fragrances. As for dyes that are preferably not included, there are no particular restrictions as long as they are components that can color the bathwater, but examples include tar-based dyes and natural dyes. Examples of opacifying agents that are preferably not included include inorganic white pigments such as titanium dioxide and zinc oxide, and coatings thereof, fine particles of resins such as polystyrene, and emulsions thereof.

[0013] <(C) Oily components other than fragrance that are liquid at 25°C> Carbon dioxide effervescent bath additives are more preferably made to contain an oily component (C) that is liquid at 25°C, other than fragrance, in order to improve the feel of the bathwater and provide good moisturizing properties. Other than fragrances, the oily components (C) that are liquid at 25°C are not particularly limited and include, for example, hydrocarbons such as liquid paraffin, heavy liquid isoparaffin, light liquid isoparaffin, squalane, squalene, and bristan; fatty acid esters such as octyl palmitate, isopropyl palmitate, isostearyl palmitate, isopropyl myristate, myristyl myristate, isocetyl myristate, octyldodecyl myristate, cetyl octanoate, tri(caprylic / capric acid)glycerin, decyl oleate, isocetyl stearate, and isotridecyl isononanoate; and lauryl Examples include higher alcohols such as alcohol, oleyl alcohol, and hexyldodecanol; natural oils and fats such as soybean oil, jojoba oil, rice bran oil, olive oil, and coconut oil; hydrogenated oils obtained by hydrogenating these natural oils and fats; and glycerides such as myristic acid glyceride; silicone oils such as methylpolysiloxane, methylcyclopolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, and various modified silicones; and higher fatty acids such as oleic acid, linoleic acid, linolenic acid, lanolinic acid, and isostearic acid. These may be used individually or in combination of two or more. Among these, at least one selected from the group consisting of liquid paraffin and heavy liquid isoparaffin is preferred.

[0014] The content of the oily component (C) that is liquid at 25°C other than the fragrance in 100% by mass of the carbon dioxide-foaming bath agent is preferably 0.001 to 1.5% by mass, and more preferably 0.1 to 1.0% by mass. When the content of the oily component (C) that is liquid at 25°C other than the fragrance is within the above range, it is preferable in terms of imparting a moisturizing feeling, adjusting the physical properties of the preparation, and the strength of foaming.

[0015] <Nonionic surfactant that is liquid at 25°C (D)> Carbon dioxide effervescent bath additives may optionally contain a nonionic surfactant (D) that is liquid at 25°C. Examples of nonionic surfactants (D) that are liquid at 25°C include polyethylene glycol fatty acid esters such as polyoxyethylene glycol monolaurate and polyoxyethylene glycol monooleate; polyoxyethylene glycerin fatty acid esters such as polyoxyethylene (caprylic / capric acid) glyceryl and polyoxyethylene oleate glyceryl; sorbitan fatty acid esters such as sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monoisostearate, sorbitan sesquiisostearate, and sorbitan coconut oil fatty acid esters; and polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan isostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, and polyoxyethylene coconut oil fatty acid ester. Examples include polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate and polyoxyethylene sorbitan tetraoleate; polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether and polyoxyethylene oleyl ether; polyoxyethylene polyoxypropylene glycol; ethylenediamine tetrapolyoxyethylene polyoxypropylene; and polyoxyethylene hydrogenated castor oil. These may be used individually or in combination of two or more. Among these, polyoxyethylene glycerin fatty acid esters, polyethylene glycol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene alkyl ethers are preferred, polyoxyethylene sorbitan fatty acid esters and polyoxyethylene glycerin fatty acid esters are more preferred, polyoxyethylene sorbitan tetraoleate and polyoxyethylene (caprylic / capric acid) glyceryl are even more preferred, and polyoxyethylene (caprylic / capric acid) glyceryl is particularly preferred.

[0016] The content of the nonionic surfactant that is liquid at 25°C in 100% by mass of the carbon dioxide gas foaming bath agent is preferably 0.01 to 1.5% by mass, more preferably 0.05 to 0.5% by mass. When the content of the nonionic surfactant that is liquid at 25°C is within the above range, the storage stability is good and the formation of floating foam and floating matter can be suppressed.

[0017] (E) Inorganic salts The carbon dioxide gas foaming bath agent may further contain inorganic salts as optional components. Examples of the inorganic salts include anhydrous silicic acid, calcium silicate, sodium sulfate, magnesium sulfate, sodium chloride, ammonium chloride, sodium nitrate, potassium nitrate, calcium nitrate, sodium polyphosphate, sodium phosphate, sodium iron phosphate, calcium oxide, magnesium oxide, aluminum sulfate, sodium thiosulfate, potassium chloride, potassium sulfide, alum, metasilicic acid, etc. These may be used alone or in combination of two or more. Among these, sodium sulfate, magnesium sulfate, and sodium chloride are preferred, and sodium sulfate is more preferred.

[0018] When blending inorganic salts, the content of the inorganic salts in 100% by mass of the carbon dioxide gas foaming bath agent is preferably 1.0 to 30.0% by mass, more preferably 5.0 to 20.0% by mass, and even more preferably 1 to 15% by mass. When the amount of the inorganic salts is within the above range, the moldability is good and the bath agent does not become too hard, so it does not interfere with foaming and there is no problem of undissolved residue when dissolved in hot water.

[0019] <Other components> In addition to the effects of the present invention, known ingredients commonly used in bath products may be optionally added to the carbon dioxide effervescent bath additive. For example, lubricants such as polyethylene glycol, talc, and magnesium stearate; water-soluble polymers such as polyvinylpyrrolidone, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, dextrin, sodium carboxymethylcellulose, starch, and cationized cellulose; humectants such as sodium glutamate, sodium ascorbate, collagen, sodium hyaluronate, and sodium chondroitin sulfate; and crude drugs such as Atractylodes lancea, Atractylodes macrocephala, Valerian, Schizonepeta tenuifolia, Magnolia bark, Cnidium officinale, Orange peel, Angelica acutiloba, Zingiber officinale powder, Ginseng, Cinnamon bark, Peony root, Mentha arvensis leaf, Scutellaria baicalensis, Gardenia fruit, Poria cocos, Poria cocos, Acorus calamus, Artemisia princeps, Schisandra chinensis, Angelica dahurica, Houttuynia cordata, Ophiopogon japonicus, Saffron, Phellodendron amurense extract, Citrus unshiu peel, Fennel, Citrus unshiu peel powder, Chamomile, Melissa officinalis, Rosemary, Horse chestnut, Achillea millefolium, Arnica montana, and other crude drugs; Alcohols such as ethanol, stearyl alcohol, isopropyl alcohol, cetyl alcohol, and hexadecyl alcohol; polyhydric alcohols such as glycerin, propylene glycol, and sorbitol; sulfur, mineral sand, mineral deposits, casein, neutral clay, sodium salicylate, egg yolk powder, scallop rice bran, mica powder, skim milk powder, antiseptics, chelating agents, dyes, and other ingredients necessary for formulation, but are not limited to these.

[0020] <Dosage Form> There are no particular restrictions on the dosage form of the carbon dioxide effervescent bath additive, and examples include granules, tablets, briquettes, flakes, and tablets. However, briquette-type bath additives are preferred due to their good solubility. Briquette-type bath additives are molded into shapes such as pillow, lens, almond, prism, rod, finger, and flat, but the particle size is preferably 1 mm to 10 mm, and more preferably 3 mm to 6 mm. By using such a size, the amount of dissolved carbon dioxide can be increased, so when used as a bath additive, a very good warming effect can be obtained. Of the above shapes, flat, pillow, and almond shapes are preferred from the viewpoint of moldability.

[0021] (Manufacturing method) In manufacturing briquette-type bath additives, first, the essential components (A) and (B) mentioned above, along with components (C), (D), (E) and other optional components that may be added as needed, are mixed and ground using a Henschel mixer, high-speed mixer, universal mixer, SV mixer, vertical granulator, Ribocorn mixer, etc., to prepare a compound bulk.

[0022] The briquette-type bath additive is then supplied to a briquetting machine and compressed to obtain a sheet-like primary molded body in which multiple briquette particles are formed into a sheet shape via connecting parts. This is then crushed to obtain the briquette agent.

[0023] The roll rotation speed in the briquetting machine is preferably 5 to 35 rpm, and more preferably 6 to 30 rpm. The screw rotation speed in the briquetting machine is preferably 10 to 160 rpm, and more preferably 15 to 130 rpm. When the roll rotation speed and screw rotation speed are within the above ranges, it is possible to produce briquettes that have excellent appearance and sufficient strength while ensuring production speed.

[0024] When the above-mentioned bulk mixture is supplied to the briquetting machine, it is preferable to adjust the clearance between the rolls and the pressing force of the feed screw to set the linear pressure between the rolls to 10-25 kN / cm, more preferably in the range of 13-23 kN / cm, and even more preferably in the range of 15-20 kN / cm. Within this range, the particles will have no burrs or chips during crushing and will have an excellent appearance, and roll adhesion and leakage during compression molding will be suppressed, thereby improving production efficiency.

[0025] <At least one component selected from the group consisting of fragrances, colorants, and opacifiers, or a combination with a bath additive containing the said components> The carbon dioxide effervescent bath additive according to the first embodiment of the present invention is used in combination with at least one component selected from the group consisting of fragrances, dyes, and clouding agents, or a bath additive containing the said components. Bath additives that can be combined include effervescent bath additives, powdered bath additives, liquid bath additives, and other bath additives, which typically contain, in addition to fragrances, dyes and opacifiers, components selected from the group consisting of inorganic salts, carbonates, oily components other than fragrances, surfactants, herbal medicines, water-soluble polymers, sugars, amino acids, minerals and plant extracts. There are no particular restrictions on the fragrances, colorants, and opacifiers, but examples include those similar to those listed in the section above on ingredients that are preferably not included. By using these combinations, it is possible to add carbon dioxide effervescence to bath salts with a preferred scent, color, or those containing these properties. Furthermore, in a preferred embodiment, since the carbon dioxide effervescent bath additive does not contain dyes, fragrances, or clouding agents, it has the effect of not causing disharmony with the color and fragrance of the ingredients it is combined with. The bath additive used in combination can be any type of product, including quasi-drugs, cosmetics, or general merchandise.

[0026] <Method for restoring dissolved carbon dioxide concentration in a bath> The carbon dioxide effervescent bath additive of the second aspect of the present invention is used by adding it to the bath multiple times with time intervals in between. When using the carbon dioxide effervescent bath additive, the dissolved carbon dioxide concentration in the bath decreases over time. By adding the carbon dioxide effervescent bath additive to the bath multiple times with time intervals in between, the dissolved carbon dioxide concentration in the bath can be restored after the carbon dioxide effervescent bath additive has been added at least once and time has passed. The present invention also discloses a method for restoring the dissolved carbon dioxide concentration in a bath by adding the carbon dioxide effervescent bath additive multiple times with time intervals in between. It is preferable to use an amount of organic acid within the preferred range of the present invention, as this allows for the recovery of a sufficient dissolved carbon dioxide concentration. There are no particular restrictions on the time frame, but it is preferable to keep it within two hours in order to obtain sufficient recovery effect on dissolved carbon dioxide concentration. [Examples]

[0027] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The following commercially available products were used as components in the examples. Polyethylene glycol 6000:PEG6000 (manufactured by Toho Chemical Industry Co., Ltd.) Polyoxyethylene (caprylic / capric acid) glyceryl: Softigen 767 (manufactured by IOI Oleo) Polyvinylpyrrolidone: Kriejas K-90, manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Liquid paraffin: Highcol K-350, manufactured by Kaneda Co., Ltd. Heavy liquid paraffin: Pearlream 18, manufactured by NOF Corporation.

[0028] [Examples 1-3] The total of 15 kg of the formulation shown in Table 1 was mixed uniformly in a universal mixer to prepare the bulk, which was then supplied to a briquetting machine (BSS-IH, manufactured by Shinto Kogyo Co., Ltd.) to form flattened briquette formulations with a particle size of 4.8 mm. The roll rotation speed was 8 rpm and the screw rotation speed was 16 rpm.

[0029] [Table 1]

[0030] <Evaluation of dissolved carbon dioxide concentration> The evaluation in Table 2 was conducted according to the following criteria. For each evaluation, the dissolved carbon dioxide concentration was measured using a dissolved carbon dioxide meter (Oxyguard CO2, manufactured by Oxy Guard) by taking approximately 200 mL of water from the bath.

[0031] (1) Single use For single-product use, the carbon dioxide effervescent bath additives from Examples 1-3 were used individually. 30g of the carbon dioxide effervescent bath additives from Examples 1-3 were added individually to a 200L bath, and the dissolved carbon dioxide concentration in the bath was measured immediately after addition and 24 hours later. After 24 hours, another 30g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath, and the dissolved carbon dioxide concentration in the bath was measured again.

[0032] (2) Combination with foaming agent A 30g of effervescent formulation A (briquette type) was added alone to a 200L bath, and the dissolved carbon dioxide concentration in the bath was measured immediately after addition. Immediately thereafter, 30g each of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath containing effervescent formulation A, and the dissolved carbon dioxide concentration in the bath was measured immediately after combination and 24 hours after combination. After 24 hours, another 30g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath, and the dissolved carbon dioxide concentration in the bath was measured again.

[0033] (3) Combination with powder formulation B 30g of powder formulation B was added alone to a 200L bath. Immediately thereafter, 30g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath containing powder formulation B, and the dissolved carbon dioxide concentration in the bath was measured immediately after the combination and 24 hours after the combination. After 24 hours, another 30g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath, and the dissolved carbon dioxide concentration in the bath was measured again.

[0034] (4) Combination with liquid formulation C 40 ml of liquid formulation C was added alone to a 200 L bath. Immediately thereafter, 30 g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath containing liquid formulation C and combined. The dissolved carbon dioxide concentration in the bath was measured immediately after combination and 24 hours after combination. After 24 hours, another 30 g of the carbon dioxide effervescent bath additives from Examples 1-3 were added to the bath, and the dissolved carbon dioxide concentration in the bath was measured again. The results are shown in Table 2.

[0035] [Table 2]

[0036] <Evaluation of color and scent> The fragrance and color of the bathwater immediately after adding the following to a 200L bath: 30g of the carbon dioxide effervescent bath additive from Examples 1-3 combined with 30g of effervescent formulation A (briquette type); 30g of the carbon dioxide effervescent bath additive from Examples 1-3 combined with 30g of powder formulation B; and 30g of the carbon dioxide effervescent bath additive from Examples 1-3 combined with 40ml of liquid formulation C. For comparison, the fragrance and color of the bathwater immediately after adding 30g of effervescent formulation A (briquette type) alone, 30g of powder formulation B alone, and 40ml of liquid formulation C alone were also evaluated. The evaluation was conducted visually by six monitors, using a scale of 0 to 3 points, and the final result was determined by the average score of the monitors, as described below.

[0037] (1) Evaluation of color 0 points: The colors are very disharmonious. 1 point: The colors are somewhat mismatched. Two points: The colors are slightly mismatched. 3 points: There is no disharmony in the colors. Here, color disharmony refers to things like the water becoming unpleasantly cloudy (excluding white turbidity) or turning a dark color.

[0038] (2) Evaluation of fragrance 0 points: The scent is extremely disharmonious. 1 point: The fragrance is somewhat disharmonious. 2 points: The scent is slightly mismatched. 3 points: There is no disharmony in the scent. Here, a disharmonious scent can refer to, for example, an unpleasant fragrance.

[0039] The following criteria were used to evaluate the six participants based on their average scores. ◎: Average score 2.5 points or more and 3 points 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 The results are shown in Table 3.

[0040] [Table 3]

[0041] The results in Tables 2 and 3 show that the carbon dioxide effervescent bath additive of this invention was able to increase the dissolved carbon dioxide concentration in the bathwater, both when used alone and when combined with other bath additives. In any combination of the carbon dioxide effervescent bath additive of this application with effervescent formulation A, powder formulation B, or liquid formulation C, there was no change in color or fragrance compared to when effervescent formulation A, powder formulation B, or liquid formulation C were used alone, and no disharmony in color or fragrance occurred. When the carbon dioxide effervescent bath additive of this invention was added after 24 hours, the dissolved carbon dioxide concentration in the bathwater was sufficiently restored.

[0042] Table 4 shows the formulation of foaming formulation A, Table 5 shows the formulation of powder formulation B, and Table 6 shows the formulation of liquid formulation C, which were used to evaluate the dissolved carbon dioxide concentration in Table 2 and the color and aroma in Table 3.

[0043] [Table 4]

[0044] Table 5 Table 6

Claims

1. A carbon dioxide effervescent bath additive used in combination with at least one component selected from the group consisting of fragrances, colorants, and opacifying agents, or a bath additive containing the said component, A carbonated effervescent bath additive containing organic acids (A) and carbonates (B), and free from fragrances, dyes, and clouding agents.

2. This is a carbonated effervescent bath additive that is used by adding it to the bathwater multiple times with time intervals in between, A carbonated effervescent bath additive containing organic acids (A) and carbonates (B), and free from fragrances, dyes, and clouding agents.

3. Furthermore, the carbon dioxide effervescent bath additive according to claim 1 or 2, further comprising an oily component (C) other than fragrance that is liquid at 25°C.

4. A carbon dioxide effervescent bath additive according to any one of claims 1 to 3, wherein the organic acid (A) is present in an amount of more than 20% by mass and 50% by mass or less, and the carbonate (B) is present in an amount of more than 30% by mass and 70% by mass or less.

5. The carbon dioxide effervescent bath additive according to any one of claims 1 to 4, wherein the organic acid (A) comprises at least one selected from the group consisting of fumaric acid and succinic acid.

6. A carbon dioxide effervescent bath additive according to any one of claims 1 to 5, wherein the bath additive is a briquette type with a particle size of 3 mm to 6 mm.

7. The carbon dioxide effervescent bath additive according to any one of claims 3 to 6, wherein the oily component (C) that is liquid at 25°C other than the fragrance is at least one selected from the group consisting of liquid paraffin and heavy liquid isoparaffin.

8. A method for restoring the dissolved carbon dioxide concentration in a bath, comprising adding the carbon dioxide effervescent bath additive described in any one of claims 1 to 7 multiple times with a time interval between each addition.

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