JP5513775B2 - Bath salt and scale control method - Google Patents

Description

  The present invention relates to a bathing agent capable of suppressing the generation of scale that causes roughness of a bathtub and the like, and a method for suppressing the scale generated in bath water, in addition to providing bathing effects such as heat retention and fatigue recovery. .

  Conventionally, for the purpose of enhancing the bathing effect such as heat retention and fatigue recovery, bathing agents mainly containing inorganic salts such as sodium carbonate, sodium sulfate, sodium hydrogen carbonate, etc., and oils, perfumes, etc. are appropriately used. ing. As a component to be contained in such a bath agent, carbonates such as sodium carbonate are indispensable for a carbon dioxide-generating bath agent that is expected to have a sufficient bath effect or an alkaline bath agent that exhibits a so-called action characteristic of a hot spring. It is not a component and is blended in many bath salts.

  However, when a bathing agent containing a carbonate such as sodium carbonate as a main component is used, there is a problem that calcium ions in tap water and carbonate ions in the bathing agent form calcium carbonate to generate scale. Such a scale adheres to the bathtub and causes roughness. Further, the scale adheres to and accumulates not only in the bathtub but also in the bath tub and the heating apparatus, and may cause malfunction of the apparatus.

  Therefore, as a technique for suppressing the generation of scale when using a bathing agent mainly composed of sodium carbonate, the bathing agent includes sequestering agents such as disodium edetate (EDTA), sodium citrate, and sodium polyphosphate. Has been proposed (Patent Document 1).

Japanese Patent Laid-Open No. 1-175928

  However, the bathing agent blended with the sequestering agent used in the above-described conventional scale suppression technology is not sufficient in suppressing the generation of scale, and does not reach the roughness of the bathtub after use. However, further improvements were desired.

  Therefore, the present invention is a carbonate-containing alkaline bathing agent that provides a bathing effect such as heat retention and fatigue recovery, a bathing agent that can prevent the occurrence of roughness of the bathtub by suppressing the occurrence of scales composed of calcium carbonate, and bath water It is an object of the present invention to provide a method for suppressing the scale generated in the above.

  As a result of intensive studies to solve the above problems, the present inventors have found that trisodium phosphate is excellent in the effect of suppressing the generation of scale when using a carbonate-containing alkaline bath, The present invention has been completed.

That is, the present invention has the following configuration.
(1) A bathing agent which contains carbonate as an essential component and exhibits alkalinity when dissolved in bath water, and contains trisodium phosphate in order to suppress generation of scale. .
(2) The bath agent according to (1), wherein the amount of trisodium phosphate is 1 to 10% by mass based on the total amount of the bath agent.
(3) The bath agent according to (1) or (2), wherein the pH when dissolved in bath water is 9 to 11.
(4) A method for suppressing a scale generated in an alkaline bath water in which carbonate is dissolved, wherein the sodium salt is added with trisodium phosphate.

  According to the present invention, there is provided a carbonate-containing alkaline bathing agent that provides a bathing effect such as heat retention and fatigue recovery, and can provide a bathing agent that can prevent the occurrence of the roughness of the bathtub by suppressing the generation of scale composed of calcium carbonate. In addition, it is possible to provide a method for suppressing scale generated in bath water exhibiting alkalinity in which carbonate is dissolved.

2 is a micrograph of white powder collected in Example 2. FIG. 6 is a photomicrograph of white powder collected in Comparative Example 5.

The bath agent of the present invention contains carbonate as an essential component. Examples of the carbonate include sodium carbonate, sodium sesquicarbonate, potassium carbonate, magnesium carbonate, ammonium carbonate, and ammonium sesquicarbonate. These carbonates can be used alone or in combination of two or more. Among these, sodium carbonate is preferable because it can sufficiently enjoy a bathing effect such as heat retention and fatigue recovery, a mellow hot water resembling a natural spring, a smooth feeling after bathing, and a smooth feeling.
The blending amount of the carbonate is 40 to 95% by mass, preferably 40 to 50% by mass, based on the total amount of the bath agent.

  The bath agent of the present invention is formulated with trisodium phosphate to suppress the generation of scale. Ingredients to be added to the bathing agent, it is required to be able to dissolve quickly when it is added to the bath water and to adjust the pH of the bath water to a desired range. It is highly effective in suppressing scale in alkaline bath water. This scale-inhibiting effect of trisodium phosphate is particularly prominent in bath water that is alkaline due to sodium carbonate.

  The blending amount of the trisodium phosphate is preferably 1 to 10% by mass, more preferably 1 to 5% by mass, based on the total amount of the bath agent. When the blending amount of trisodium phosphate is less than 1% by mass, the effect of suppressing the scale may be insufficient. On the other hand, when it exceeds 10% by mass, the bathing effect, the feeling of hot water, and the touch as described above may occur. There is a risk of damage.

  In the bath agent of the present invention, in addition to the above-mentioned carbonate and trisodium phosphate, one kind of various components known in the art (hereinafter also referred to as “optional component”) is used, if necessary. Or it can mix | blend in combination of 2 or more types. Although the arbitrary component which can be mix | blended with the bath agent of this invention is illustrated below, it cannot be overemphasized that it is not limited to the component etc. which were described here.

○ Inorganic salts Chlorides such as sodium chloride, potassium chloride, ammonium chloride, bicarbonates such as sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, sodium sulfate, aluminum sulfate, iron sulfate, sodium thiosulfate, potassium thiosulfate, Sulfates such as sodium hyposulfite, nitrates such as sodium nitrate, potassium nitrate, and calcium nitrate, phosphates such as sodium phosphate (excluding trisodium phosphate), sodium polyphosphate, calcium hydrogen phosphate, sulfur, sodium sulfide, Sulfides such as potassium sulfide and iron sulfite, silicic anhydride, metasilicic acid, mica powder, silicon compounds such as neutral clay, hydroxides such as sodium hydroxide and calcium hydroxide, borax, boric acid and calcium oxide , Potassium bromide, potassium permanganate, artificial callus salt, spa, mineral sand Yunohana like.
○ Organic acids Malic acid, citric acid, succinic acid, fumaric acid, tartaric acid, pyrrolidone carboxylic acid, etc.
○ Oily components Nuka oil, olive oil, soybean oil, liquid paraffin, white petrolatum, stearyl alcohol, myristic acid, lauric acid, palmitic acid, monoglyceride, triglyceride, rice bran extract, rice germ oil, ceramide, silicone, etc.

○ High molecular weight substances Carboxymethylcellulose, styrene polymer emulsion, dextrin, casein, egg yolk powder, skim milk powder, and rice bran.
○ Medicinal components Menthol, camphor, methyl salicylate, salicylic acid, sodium salicylate, benzoic acid, etc.
○ Enzymes Trypsin, α-chymotrypsin, promelain, papain, protease, proctase, cerathiopeptidase, lysozyme, promelain, huisin, etc.

○ Fragrances and essential oils peppermint, eucalyptus, lemon, perpena, citronella, kayapte, salpia, thyme, crope, rosemary, hyssop, jasmine, camomil, neroli, mugwort, perilla, marjoram, laurel, juniper berry, nutmeg, ginger, onion , Garlic, lavender, bergamot, marjoram, clary sage, peppermint, basil, rose, petitgren, cinnamon, mace, citral, citronellal, borneol, linalool, geraniol, nerol, rosinol, orange, artemisia, camphor, salvia, menthol, cineole, eugenol , Hydroxycitronellal, sandalwood, costas, labdanum, amber, musk, α-pinene, limonene, methyl salicylate , Soujutsu, Peacock, valerian, Snapper, Cinnamon, Cucumber, Cucumber, Spruce, Tokyo, Pepper, Peonies, Pokemon, Ogon, Sanshin, Keihi, Carrot, Bud Crest, Dokugaku, Shobu, Guiyou, Pepper, Pepper, Pug Essential oils such as campi and chamomile, amyl nitrite, trimethylcyclohexanol, allyl sulfide, nonyl alcohol, decyl alcohol, phenylethyl alcohol, methyl carbonate, ethyl carbonate, phenylacetate, guaiacol, indole, cresol, thiophenol, p- Dichlorobenzene, p-methylquinoline, isoquinoline, pyridine, absins oil acetic acid, acetate ester, and the like.

○ Pigments Titanium oxide, talc, bengara, yellow iron oxide, magnesium silicate, mica, mica, titanium, calcium carbonate, magnesium carbonate, titanium dioxide, anhydrous silicic acid, zinc oxide, coated particles (granules), etc.
○ Whitening ingredients Vitamin E phenyl ester, vitamin C and its derivatives, ellagic acid, kojic acid, α-hydroxy acid, hyaluronic acid and the like.
○ Pigments Blue No. 1, Blue No. 202, Red No. 106, Red No. 2, Yellow No. 5, Yellow No. 4, Yellow No. 202 (1), Green No. 3, Orange No. 205, Yellow No. 202 (1), Legal dyes such as green No. 204, green No. 201, red No. 102, blue No. 2, orange No. 205, red No. 3, etc., natural dyes such as chlorophyll, riboflavin, annat, anthocyanin, etc.

Sulfur Sulfur, sodium thiosulfate, calcium thiosulfate, potassium thiosulfate, calcium sulfide, calcium disulfide, potassium sulfide, sodium sulfide, ammonium sulfide, barium sulfide, zinc sulfide, tin sulfide, antimony sulfide, iron sulfide, disulfide Carbon, phosphorus sulfide, etc.
○ Sebum secretion-promoting components Branched fatty acid cholesteryl ester, γ-oryzanol, yokuinin or yokuinin extract.
○ Vitamins Vitamin A, Vitamin B, Vitamin C, Vitamin D, Vitamin E, Vitamin F, Vitamin H, Pantothenic acid, nicotinic acid or its derivatives, Vitamin E nicotinic acid ester, inosit and the like.

○ Seaweed extracts Anaasasa, Mill, Usubaaonori, Hitonigusa, Sugioonori, Casanori, Heraiwatsuda, Hanemo, Nagarami, etc., Green Algae, Sea Urchin, Amygusa, Mozuku, Iroro, Matsumo, Siwahige, Habanori, Urushigusakon, Babika Trollocombs, hijiki, arame, hondawala, umitranoo, sugimori, batori, etc. Extracts obtained from red algae plants such as Kotojitsunomata, Tsunomata, Ayanishiki, Makri, Egonori, Ogonori, Ibaranori and the like.
○ Cooling sensates Menthol derivatives such as menthol, camphor, thymol, monocyclic compounds, bicyclic alcohols, tricyclic alcohols, tricyclic amides, etc.

○ Moisturizing ingredients Organic acid salts such as sodium lactate, disodium tartrate, sodium pyrrolidonecarboxylate, disodium glutamate, polyhydric alcohols such as isoprene glycol, propylene glycol, 1,3-butylene glycol, glycerin, xylose, xylitol, sorbitol Water soluble polymers such as polyethylene glycol, polyvinyl alcohol, sodium alginate and polyvinylpyrrolidone, mucopolysaccharides such as chondroitin sulfate and hyaluronic acid, collagen and derivatives thereof, protein, keratin, hybroin and hydrolysates thereof.

○ Surfactant Polyethylene glycol dioleate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, etc.
○ Other Glucose, sucrose, trehalose, phytocollage, isoflavones, glycyrrhizinate and its derivatives, glycyrrhetinate and its derivatives, paraoxybenzoate, isopropylmethylphenol, vegetable or fruit extract (extract), purified water, ions Water, deep ocean water, etc.

  What is necessary is just to set the compounding quantity of the arbitrary component mentioned above suitably in the range which does not impair the effect of this invention.

The bath agent of the present invention is a bath agent that exhibits alkalinity when dissolved in bath water. Specifically, the pH when the bathing agent of the present invention is dissolved in bath water is preferably 9-11. If the pH is less than 9, the bathing effect such as heat retention and recovery from fatigue may be insufficient, and it may not be possible to enjoy the feeling of bathing, smoothness and smoothness. If it exceeds, the skin irritation becomes stronger, which is not preferable for people with sensitive skin.
The bathing agent of the present invention is preferably completely dissolved within 20 minutes in a solubility test in which 1 g of bathing agent is dissolved in 1000 g of ion-exchanged water at 20 ° C. Thereby, when the bath agent of this invention is thrown into bath water, it can be dissolved rapidly.
In addition, the dosage form of the bath preparation of the present invention is not particularly limited, and for example, liquid preparations such as powders, granules, fine granules, tablets, blocking agents, and the like, emulsions, gels, liquids and the like. It can be set as a formulation, an effervescent formulation, an aerosol formulation, a foam formulation, etc.

The scale suppression method of the present invention is a method for suppressing the scale generated in alkaline bath water in which carbonate is dissolved by adding trisodium phosphate. As described above, trisodium phosphate exhibits a high effect in suppressing scale in an alkaline bath containing carbonate.
In the scale suppression method of the present invention, the amount of trisodium phosphate added is usually 1.5 to 15 ppm, preferably 1.5 to 7.5 ppm in the bath water. If the amount of trisodium phosphate added is small, the effect of suppressing the scale may be insufficient. On the other hand, if the amount is too large, the above-described feeling of use may be insufficient.

The bath water to which the scale suppression method of the present invention is applied may be a bath water that exhibits alkalinity with a carbonate, and if necessary, in addition to the carbonate, the above-mentioned optional components are dissolved or dispersed. It may be a thing. What is necessary is just to use the thing similar to what is mix | blended with the bathing agent of this invention mentioned above as carbonate. The carbonate concentration in the bath water is not particularly limited, but is usually preferably 40 to 150 ppm, and a sufficient suppressing effect can be obtained in this range. When the bath water is one in which the above-mentioned optional components are dissolved or dispersed, the amount thereof may be set as appropriate within a range not impairing the effects of the present invention.
The scale suppression method of the present invention may be carried out by adding the bathing agent of the present invention, which is prepared by premixing trisodium phosphate together with carbonate, into bath water (saray hot water), or at least including a carbonate. This may be carried out by separately adding trisodium phosphate to the bath water in which the bath agent is added.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(Example 1 and Comparative Examples 1 and 2)
In a plastic bathtub, 200 L of 40 ° C. bath water (using Ako city tap water (hardness 45 to 50 mg / L)) is stored, and 30 g of powdered bathing agent prepared according to each formulation shown in Table 1 is put therein. Without stirring the bathtub in the middle of the process, the mixture is dissolved while stirring well, the bubbles adhering to the side of the bathtub are removed with a sponge, and the bath is drained after standing for 12 hours. Repeated a total of 3 times. Then, the bathtub was air-dried, and the degree of roughness when the side of the bathtub was touched with bare hands was evaluated based on a two-step criterion of “feeling roughness” and “not feeling roughness”. The evaluation was performed by 10 panelists (4 men and 6 women), and the result was expressed as a percentage (%) of the number of persons determined according to each standard. The results are shown in Table 1.
The pH when the bathing agent of the formulation A shown in Table 1 was dissolved in bathing water under the above-described conditions (30 g bathing bath with respect to 200 L bathing bath at 40 ° C.) was 9.75, indicating alkalinity. .

  From Table 1, the roughness of the bathtub felt with the bath additive (prescription B) that does not contain any component for suppressing the generation of scales includes sodium citrate and sodium edetate, which are general sequestering agents. It is clear that the bathing agents (prescriptions D and E) are hardly improved, and the bathing agent of the formulation C containing sodium polyacrylate is improved but not sufficiently suppressed. On the other hand, it turns out that the roughening of a bathtub can be suppressed reliably in the bath agent (prescription A) of the present invention containing trisodium phosphate.

(Example 2 and Comparative Example 5)
In Example 2, the bathing agent prepared according to the formulation A shown in Table 1 was used, and in Comparative Example 5, the bathing agent prepared according to the formulation B shown in Table 1 was used. Of bath water (using Ako City tap water (hardness: 45-50 mg / L)), 30 g of each was added, dissolved while stirring well, and the bubbles adhering to the sides of the bathtub were removed with a sponge, 12 hours After standing still, the hot water was drained, and the bathtub was air-dried (here, a series of operations was performed only once). Thereafter, the side surface of the bathtub below the water line was scraped off to collect white powder, and this sample was observed with a microscope (“B071” manufactured by OLYMPUS) at a magnification of 400 times. The result (micrograph) in Example 2 is shown in FIG. 1, and the result (micrograph) in Comparative Example 5 is shown in FIG. In addition, the white powder collected in Comparative Example 5 conforms to the qualitative reaction test method for calcium salts and carbonates described in the Quasi-drug Raw Material Standard (2006) (hereinafter also referred to as “External Code”). Accordingly, analysis was conducted and it was confirmed that the main component was calcium carbonate.
As shown in FIG. 1 and FIG. 2, in Comparative Example 5 using a bath agent that does not contain trisodium phosphate, a large number of granular lumps (scales) are confirmed, whereas a book containing trisodium phosphate. In Example 2 using the bathing agent of the invention, small points were observed in some places. That is, in Comparative Example 5, crystals of scale (calcium carbonate) grow larger than Example 2. From this, it is clear that the crystal growth of scale can be suppressed by containing trisodium phosphate.

(Reference Example 1)
The trisodium phosphate as an essential component in the bath agent of the present invention and the same sodium phosphate salt, sodium dihydrogen phosphate and disodium hydrogen phosphate, are suitable as components to be blended in the bath agent (that is, Solubility and pH) were examined by the following methods. The results are shown in Table 2.
<Solubility>
1 g of each sodium phosphate salt (both using outer standard grades manufactured by Taihei Chemical Industry Co., Ltd.) is poured into 100 mL of ion-exchanged water maintained at 20 ° C. and left to stand visually every 10 minutes. The presence or absence of undissolved residues of each sodium phosphate was confirmed.
<PH>
1 g of each sodium phosphate salt (both using Taihei Chemical Sangyo Co., Ltd.'s outer original standard grade) is added to 100 mL of ion-exchanged water maintained at 20 ° C. and completely dissolved while stirring with a magnetic stirrer. The pH of the obtained solution was measured.

  From Table 2, sodium dihydrogen phosphate exhibits acidity when dissolved in water, and lowers the pH, which may impair the texture and feel of the alkaline bathing agent. Since it is feared that the mucous membrane is irritated, it is considered that it is not suitable as a component to be blended in a bath agent dissolved in bath water. In addition, disodium hydrogen phosphate is lower in solubility than other sodium phosphate salts, and there is concern about undissolved residue when added to bath water. It is considered unsuitable. On the other hand, trisodium phosphate exhibits alkalinity suitable for bath water, and can be dissolved quickly when added to bath water. It is.

(Reference Example 2)
When using carbonate (sodium carbonate), which is an essential component of the bathing agent of the present invention, as an alkaline component for making bath water alkaline, and when using bicarbonate (sodium bicarbonate) The difference in ease of occurrence was examined by the following method.
That is, 200 L of 40 ° C. bath water (using Ako City tap water (hardness: 45 to 50 mg / L)) was stored in a plastic bathtub, and a) 12.9 g of sodium carbonate and 16.5 g of sodium sulfate. Or b) 12.9 g of sodium hydrogen carbonate and 16.5 g of sodium sulfate are added, dissolved while stirring well, air bubbles adhering to the side of the bathtub are removed with a sponge, and then left to stand for 3 days. The bath water was drained. Then, the bathtub was air-dried, and the degree of roughness when touching the side of the bathtub with bare hands by 10 panelists (4 men and 6 women) was the same as in Example 1. The evaluation was based on a two-step criterion of “I don't feel“.
As a result, in the case of a) (that is, when carbonate is used), 90% of the panelists answered “feel rough” and only 10% of the panelists judged “not rough”. B) (ie, when bicarbonate was used), 100% of the panelists determined that “no roughness”.
From this, it can be seen that scale is likely to occur when carbonate (sodium carbonate) is contained, but scarcely occurs when bicarbonate (sodium bicarbonate) is used. That is, it can be said that the problem that the scale is generated in the alkaline bath water and the bathtub is rough is a problem that occurs specifically by containing carbonate.

  Although the example of the bath preparation of this invention is further shown below, this invention is not limited to these examples of preparation.

(Prescription Example 1)
Sodium carbonate: 40.0% by mass
Sodium bicarbonate: 50.0% by mass
Silicic anhydride: 8.0% by mass
Fragrance (herb-like fragrance): 1.0% by mass
Trisodium phosphate: 1.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath of Formulation Example 1 was added to 200 L of hot water at 40 ° C., the pH was 9.3.

(Prescription example 2)
Sodium carbonate: 40.0% by mass
Sodium bicarbonate: 50.0% by mass
Silicic anhydride: 6.0% by mass
Fragrance (herb-like fragrance): 1.0% by mass
Trisodium phosphate: 3.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath of Formulation Example 2 was added to 200 L of hot water at 40 ° C., the pH was 9.3.

(Prescription Example 3)
Sodium carbonate: 40.0% by mass
Sodium sulfate: 50.0% by mass
Silicic anhydride: 4.0% by mass
Fragrance (Yuzu-like fragrance): 1.0% by mass
Trisodium phosphate: 5.0% by mass
Total: 100.0% by mass
The pH when 30 g of the powdered bath of Formulation Example 3 was added to 200 L of hot water at 40 ° C. was 9.5.

(Prescription Example 4)
Sodium carbonate: 40.0% by mass
Sodium sulfate: 50.0% by mass
Silicic anhydride: 2.0% by mass
Fragrance (forest fragrance): 1.0% by mass
Trisodium phosphate: 7.0% by mass
Total: 100.0% by mass
The pH when 30 g of the powdered bath of Formulation Example 4 was added to 200 L of hot water at 40 ° C. was 9.5.

(Prescription Example 5)
Sodium carbonate: 60.0% by mass
Sodium bicarbonate: 30.0% by mass
Silicic anhydride: 6.0% by mass
Fragrance (herb-like fragrance): 1.0% by mass
Trisodium phosphate: 3.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath of Formulation Example 5 was added to 200 L of hot water at 40 ° C., the pH was 9.7.

(Prescription Example 6)
Sodium carbonate: 60.0% by mass
Sodium sulfate: 30.0% by mass
Silicic anhydride: 4.0% by mass
Fragrance (Yuzu-like fragrance): 1.0% by mass
Trisodium phosphate: 5.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath agent of this formulation example 6 was added to 200 L of hot water at 40 ° C., the pH was 9.8.

(Prescription Example 7)
Sodium carbonate: 60.0% by mass
Sodium sulfate: 30.0% by mass
Silicic anhydride: 2.0% by mass
Fragrance (forest fragrance): 1.0% by mass
Trisodium phosphate: 7.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath of Formulation Example 7 was added to 200 L of hot water at 40 ° C., the pH was 9.9.

(Prescription Example 8)
Sodium carbonate: 90.0% by mass
Silicic anhydride: 6.0% by mass
Fragrance (herb-like fragrance): 1.0% by mass
Trisodium phosphate: 3.0% by mass
Total: 100.0% by mass
The pH when 30 g of the powdered bath of Formulation Example 8 was added to 200 L of hot water at 40 ° C. was 10.1.

(Prescription Example 9)
Sodium carbonate: 90.0% by mass
Silicic anhydride: 4.0% by mass
Fragrance (Yuzu-like fragrance): 1.0% by mass
Trisodium phosphate: 5.0% by mass
Total: 100.0% by mass
The pH when 30 g of the powdered bath of Formulation Example 9 was added to 200 L of hot water at 40 ° C. was 10.1.

(Prescription Example 10)
Sodium carbonate: 90.0% by mass
Silicic anhydride: 2.0% by mass
Fragrance (forest fragrance): 1.0% by mass
Trisodium phosphate: 7.0% by mass
Total: 100.0% by mass
When 30 g of the powdered bath agent of the formulation example 10 was added to 200 L of hot water at 40 ° C., the pH was 10.1.

(Prescription Example 11)
Sodium carbonate: 88.0% by mass
Silicic anhydride: 1.0% by mass
Fragrance (forest fragrance): 1.0% by mass
Trisodium phosphate: 10.0% by mass
Total: 100.0% by mass
The pH when 10.0 g of the powdered bath of Formulation Example 11 was added to 200 L of hot water at 40 ° C. was 10.0.

Claims (3)

A bathing agent containing carbonate as an essential component and exhibiting alkalinity when dissolved in bath water, trisodium phosphate is blended in an amount of 1 to 10% by mass based on the total amount of the bathing agent in order to suppress the generation of scale. Bathing agent characterized by comprising. The bath agent according to claim 1, wherein the pH is 9 to 11 when dissolved in bath water.   A method for suppressing scale generated in bath water showing alkalinity in which carbonate is dissolved, wherein trisodium phosphate is added.