JP6492142B2 - Heating method when bathing in footbath and solid bath preparation for warming up when bathing in footbath - Google Patents

Description

  The present invention relates to a solid bath agent, a mineral stain cleaning method, and a skin or hair cosmetic method, and is specifically called a carbon dioxide bath agent or a bath agent, and is used for bathing, showering, hair washing, esthetics, and the like. Further, the present invention relates to a solid bath preparation that is also excellent in cleaning power of mineral dirt, a mineral dirt cleaning method, and a skin or hair cosmetic method.

  It is possible to mold bicarbonate (sodium bicarbonate or potassium bicarbonate) and organic acid separately or as a mixture by powdering or tableting, etc., and to make a foamable composition (solid material) utilizing a neutralization reaction. It is applied to products such as cleaning agents, bath agents, bath water cleaners, and pool disinfectants. These products (solids) have the advantage that when they are poured into hot water, the bicarbonate is neutralized with organic acids and reacts to generate carbon dioxide and dissolve quickly, while at the same time providing a comfortable feeling to the user. Therefore, it has the effect of increasing the commercial value. In particular, a bath preparation is said to have an effect of promoting blood circulation by percutaneous absorption of the generated carbon dioxide gas into blood vessels and is actively used.

  Like conventional bath preparations, when solidifying by combining bicarbonate and organic acid, when dissolved in hot water, a neutralization reaction occurs vigorously while dissolving, and carbon dioxide gas is generated. Because it is difficult to dissolve in hot water for bathing at about 41 ° C, the solubility decreases further as the temperature rises, and the concentration of carbon dioxide in the hot water is infinitely low (Henry's law). High concentration carbonated water could not be produced without a device that compresses and dissolves carbon dioxide gas under high pressure and dissolves continuously using a hollow fiber membrane or the like.

  Therefore, you can enjoy the momentum of foaming, but the fact is that the concentration of carbon dioxide in hot water is low and the carbon dioxide dissolved in the blood vessel by percutaneous absorption is low, so the bathing effect such as warming the body can not be obtained The inventors found out what had happened.

Natural carbonated springs are called recuperation springs when the concentration of carbon dioxide is 1000 ppm or more, and it is said that a high warm bath effect is obtained. This is a solution of carbon dioxide dissolved at a high concentration under high pressure underground. Yes, if you wanted to make this 1000ppm with artificial carbonated springs, you had to dissolve it with a special device such as a membrane using a high-pressure gas cylinder, and the device was expensive, and it was a large-scale device that could not be used easily. .

  Therefore, as a simple method of using carbonated springs at home, just putting it in hot water in a bath will entertain the bath agent that dissolves while generating carbon dioxide gas, neutralizing reaction using bicarbonate and organic acid In the present invention, a bath agent that is foamed (sometimes referred to as a bath agent in the present invention) has become the mainstream.

  In this case, many are considered to be good carbonated springs with the phenomenon that a lot of carbon dioxide gas comes out and foams on the skin. In general, it is designed to be weakly acidic with a pH of 4 or more and less than 5.5, and organic acids are used in excess of bicarbonate. The neutralization reaction is vigorously added to dissolve the foaming carbon dioxide gas in hot water.

In the study of the present inventors, in this method, as described above, the neutralization reaction is performed vigorously under weak acidity, the bubble diameter of carbon dioxide gas becomes unlimited, and most of the carbon dioxide gas merges to increase buoyancy. Even if it looks like a large amount of carbon dioxide is coming out of the bath agent, the actual concentration of carbon dioxide in the molten water cannot be increased. It was only about 100 ppm, which is far away, or less.

In general, natural carbonated springs are weakly acidic, and the carbon dioxide concentration is overwhelmed by the general idea that carbonated springs are called 1000 ppm or more. It was common to have foam on the skin, but when the bath agent is acidic, carbon dioxide gas has the property of volatilizing out of the liquid as a gas and enjoys foaming in the first bathing, salt concentration Even if you can enjoy some warming effects, etc., when another family takes a bath after foaming, there is almost no carbon dioxide in the liquid and you can not get the warming effect of the body, every time you take a bath The fact was that we had to put in a new bath.

  Therefore, the present inventors have to react the generation of carbon dioxide in hot water with the carbon dioxide easily dissolved in the liquid. I found out that it should be neutral as close as possible to the body fluid pH.

  That is, as a result of detailed examination of the effect of the carbonated spring by the present inventors, when the carbon dioxide gas is dissolved at a high concentration with the artificial carbonated spring, the carbon dioxide gas is dissociated and becomes acidic, and the pH of the hot water becomes around 4.5. . In addition, natural carbonated springs are also slightly acidic, but in this case, the pH value is only weakly acidic. It shows that the acid is not excessively acidic.) The carbon dioxide gas is neutralized and neutralized just by touching body fluids such as skin and hair. Even if the bathing agent imitates the value of natural carbonated spring by the PH value and puts an excess of organic acid, making the carbon dioxide gas easy to foam and weakly acidic, it is bicarbonate ions that are absorbed into the blood vessels, and the acidity is strong Found that even if it entered the body fluid from the skin, it could not be neutralized to bicarbonate ions and was not absorbed percutaneously, so it was completely meaningless.

  In general, the explanation of the effects of carbonated springs describes that carbon dioxide gas is absorbed directly through the skin, but this is a complete misconception, "If carbon dioxide gas is absorbed directly into the blood vessel and dissolved in the blood vessels. For example, if carbon dioxide in the air is not absorbed percutaneously, it is calculated from the dissociation constant in the equilibrium theory of carbon dioxide, and at PH 6.35, 50% of the carbon dioxide changes to bicarbonate ions. 90% is bicarbonate ion if the same pH is 7.45.

  Since most body fluids on the blood and skin surface are about 7.4 neutral, if the body fluid is neutral, the carbonic acid component chemically exists only as bicarbonate ions and is absorbed into the blood vessels through the skin. The component must be bicarbonate ion, which is our new discovery.

That is, in the blood vessel, it should be dissolved from bicarbonate ions as estimated from PH instead of carbon dioxide. The reason for this is that a correct scientific understanding is that carbonate ions exist in the form of carbonate ions in weak acidity, carbonate ions in neutral, bicarbonate ions HCO ₃ ⁻ , and in alkalis in carbonate ions CO ₃ ^2−. Among them, most are dissolved as bicarbonate ions.

  As mentioned above, natural carbonated springs may be weakly acidic, but there is no titer, and CO2 (carbon dioxide) attached to the skin is immediately neutralized and absorbed as bicarbonate ions and transdermally absorbed into the capillaries. It should be the correct explanation that it dissolves.

  If the bathing agent is in an acidic, excess organic acid state with a titer, no matter how much carbon dioxide gas is foamed, the carbon dioxide gas tends to evaporate into the air and adheres a lot to the skin and body fluids. However, it is not neutralized by body fluids and cannot be absorbed into blood vessels, so it should not be absorbed by blood vessels, and there should be no health benefits such as increasing blood flow or raising body temperature. is there.

  Therefore, the common sense of conventional bathing agents that only need to foam carbon dioxide gas does not provide a health effect, and in many cases it is misled by the wrong explanation that carbon dioxide gas is absorbed through the skin. The combination of salt and excess organic acid led to the pursuit of neutralization reaction and foaming, which allowed us to design an ineffective bath agent.

  Even if carbon dioxide gas is foamed in large quantities, the carbon dioxide gas itself is never absorbed percutaneously, and the bathing effect of natural carbonated spring that raises the blood flow and raises the body temperature by being taken into the blood vessels in the body is I was faced with the problem of not being able to get it.

  Even so, even if the organic acid is reduced and the bath agent is designed in a neutral or weakly alkaline state, according to the study by the present inventors, in fact, sufficient neutralization reaction does not occur, and foaming is extremely weak. On the other hand, no foaming of carbon dioxide gas was obtained, and this also became a meaningless problem.

  For this reason, this type of product on the market was far from a bathing effect close to natural carbonated springs.

  Conventionally, as a first method, there has been proposed a method in which carbonated salt and salt salt of sodium sulfate are prepared in advance, and an organic acid is mixed and adjusted thereto (Patent Document 1).

  As the second component, 30 to 70% by mass of polyethylene glycol (hereinafter sometimes abbreviated as “PEG”) having an average molecular weight of 950 to 3,700 and 70 to 30% by mass of other foamable components are blended. Then, a method has been proposed in which PEG is melted by heating and the foaming component is embedded in PEG (Patent Document 2).

  However, in these methods of coating with a large amount of PEG, to stabilize the product, mixing a large amount of components not only reduces the amount of carbon dioxide generated, but also detracts from the consumer's comfortable feeling of use. The amount of active ingredients that express the purpose of the product will decrease, so the amount of carbon dioxide generated will decrease, the amount of bath agent used will increase, and each other will not depend on the neutralization reaction. Since it dissolves independently, the amount of carbon dioxide gas is small, and unless a large amount of bathing agent is added, the target carbon dioxide gas cannot be dissolved and the cost increases. Further, a bath agent that has the effect of the generated carbon dioxide gas loses its commercial value and becomes a fatal defect.

  As a means for solving these problems, an organic acid that does not contain water or does not liberate crystal water at 50 ° C. or less and PEG are heated and melted and mixed at 60 to 100 ° C. There has been proposed a method for producing a bath preparation that is cooled and powdered while stirring in an air fluidized bed equipped with a stirring blade, and then added with sodium hydrogen carbonate and sodium carbonate to form a tablet. Examples of organic acids that do not contain water or do not release crystal water at 50 ° C. or less include fumaric acid, tartaric acid, succinic acid, citric acid, succinic acid, gluconic acid, and adipic acid (Patent Document 3).

  Even in such a bath agent, from the hypothesis that neutralization of bicarbonate and organic acid and generation of violent carbon dioxide should be effective, most bath agents have a pH of 4.5 in hot water dissolved in hot water. As described above, it has been designed as an acidic bath so as to have an acidity of less than 6.0.

  Therefore, carbon dioxide gas has the property of volatilizing in the air, and the PH of the blood vessel is 7.4, and the existence probability of bicarbonate ions that should be absorbed by the blood vessel is extremely low. The warming effect of the body is small, and in most cases, calcium carbonate, magnesium carbonate, or aluminum salt is added, and hot water cooling is a product that adds warmth like the effect of seawater hot spring by increasing the salt concentration Was almost.

  Therefore, in most cases, calcium carbonate or magnesium salt of calcium carbonate or calcium sulfate that dissolves and becomes transparent when acidic is added, or an alkali metal salt or heavy metal salt is added to the components that are insoluble in suspension in cloudy water. It was common to provide healing with visual hot spring turbidity (Patent Documents 4 and 5).

JP 58-213714 A JP 58-105910 A Japanese Patent Publication No. 7-47532 JP 2005-263805 A JP 2007-106697 A

  Therefore, a first object of the present invention is to use an organic acid as a compound that causes a neutralization reaction with a compound as a carbon dioxide gas generation source and a bicarbonate (sodium bicarbonate, potassium bicarbonate), and immediately after being dissolved. By adjusting the pH value of the aqueous solution (hot water) to be within a specific range, the pH of the aqueous solution after dissolution of the solid bath agent is neutral to weakly alkaline within the specific value. Carbonate and organic acid are violently and efficiently neutralized, and carbon dioxide bubbles of the smallest possible size can be continuously released for a certain period of time. Most of the generated carbon dioxide is in the air by hot water PH. It is dissolved in water without escaping, that is, the pH immediately after dissolution is designed to be neutral to weakly alkaline within a specific value, thereby increasing the concentration of bicarbonate ions in water. Can easily become bicarbonate ions, and can be combined with the existing bicarbonate ions to increase the concentration of bicarbonate ions from the skin to the blood vessels, and the warming method when bathing in footbaths and the warmth during bathing in footbaths It is to provide a solid bath preparation.

  The second object of the present invention is to easily neutralize the generated carbon dioxide component to bicarbonate ions with hot water PH, to increase the concentration of bicarbonate ions absorbed percutaneously, thereby significantly increasing blood flow and increasing body temperature. In addition to enhancing the bathing effect such as health and beauty from the inside, the bathing agent does not substantially contain bicarbonate sequestering substances, so that it can improve the detergency of mineral stains on the skin and hair. An object of the present invention is to provide a warming method during bathing in footbaths and a solid bath preparation for maintaining warming during bathing in footbaths.

Other objects of the present invention will become apparent from the following description.
In the present invention, “amount” represents “mass” unless otherwise specified, and “%” represents “mass%” unless otherwise specified.

The present invention for solving the above problems has the following configuration.

[Invention 1]
In a solid bath containing bicarbonate (sodium bicarbonate or potassium bicarbonate) and an organic acid, and not containing birch sap and aluminum salt ,
The aqueous solution immediately after dissolving the solid bath agent has a pH of 5.5 to 9.0, and does not contain a bicarbonate sequestering substance which is a compound containing calcium and magnesium ,
The organic acid is at least one of citric acid, fumaric acid, succinic acid, malic acid, and a solid bath containing anhydrous sodium carbonate and / or anhydrous potassium carbonate;
Immerse your feet in hot water in which the solid bath is dissolved to suppress the bicarbonate ions in the hot water from being sequestered by the bicarbonate sequestering substance,
A method for warming a bath in footbaths, characterized in that it maintains the warming effect of the foot skin surface.

[Invention 2]
In a solid bath containing bicarbonate (sodium bicarbonate or potassium bicarbonate) and an organic acid, and not containing birch sap and aluminum salt ,
The aqueous solution immediately after dissolving the solid bath agent has a pH of 5.5 to 9.0, and does not contain a bicarbonate sequestering substance which is a compound containing calcium and magnesium ,
The organic acid is at least one of citric acid, fumaric acid, succinic acid, malic acid, and a solid bath containing anhydrous sodium carbonate and / or anhydrous potassium carbonate;
Immerse your feet in hot water in which the solid bath is dissolved to suppress the bicarbonate ions in the hot water from being sequestered by the bicarbonate sequestering substance,
A solid bath preparation for warming when bathing in footbaths, characterized in that it maintains the warming effect of the foot skin surface.

  According to the first and second aspects of the invention, the generated carbon dioxide gas quickly changes into bicarbonate ions due to the pH of the hot water, dissolves in the hot water, suppresses escape into the air, and efficiently converts to high concentrations as bicarbonate ions. Dissolved and bicarbonate ions were immediately absorbed into the blood vessels as they were, blood flow was increased, and it became possible to provide a solid bath preparation with high health and beauty effects from the inside.

  Furthermore, although conventional detergents and shampoos have a cleaning effect against oil stains on the skin and hair, mineral ions attached to the surface of keratin and proteins adhere to high concentrations and become mineral stains. No cleaning effect was observed. In this respect, according to the above-described invention, the realization of a high-concentration bicarbonate ion and a bicarbonate ion sequestering substance-free bathing agent makes it possible for the bicarbonate ion to exist free, and the mineral on the skin and hair is free of bicarbonate. Ions can be removed and the body odor and hair odor caused by the mineral stains can be removed, providing a solid bath preparation for health and beauty and hair, as well as mineral stain cleaning and beauty methods. .

  In addition, bicarbonate ions can be present more freely, and free hydrogen ions can also be present, which improves the cleaning effect of mineral stains, and provides a solid bath preparation with higher health, beauty, and hair beauty effects. The effect of the present invention was remarkable.

  Furthermore, the bath agent can be made solid, such as powder, granules, tablets, etc., and the generation of carbon dioxide gas can be activated more actively with specific neutral to weak alkaline PH, and a remarkable invention effect can be obtained. In this case, the neutralization reaction can be made active, and the effect of the present invention is remarkable.

  In addition, it becomes possible to continue to generate micro-sized carbon dioxide bubbles of a certain size or less efficiently for a long time, and the pH of the aqueous solution after dissolution of the solid bath agent is easily neutralized to bicarbonate ions. It can be a value that can be dissolved in the concentration, and does not impair the neutralization reactivity in the solid bath preparation, can maintain a sufficient concentration of carbon dioxide, and enhances the transdermal absorption of carbon dioxide by the skin affinity of citric acid, We have become able to provide a carbonated spring bath with high health and beauty effects.

  Furthermore, the bathing agent can be made into a tablet, the acidic components inside the tablet are dissolved in high concentration and come into contact with each other, and the neutralization reaction is likely to occur. The fine bubbles can be continuously generated over a long period of time, the concentration of the carbon dioxide component dissolved in water can be maximized, and the effects of the present invention can be made remarkable.

  Furthermore, organic acids have been identified, and citric acid as an organic acid is particularly effective, and the neutralization reaction can be efficiently carried out even under conditions with a small amount of organic acid that becomes neutral after dissolution. Therefore, the effect of the present invention could be remarkably improved because the carbon dioxide component dissolved efficiently in the water by continuously generating micro-sized carbon dioxide bubbles efficiently and having a higher concentration to make bicarbonate ions free.

  In addition, the solid bath agent which concerns on this invention is not restricted to the use as described in a bath agent other background art. For example, it may be used for shower water or aesthetic mist by combining with equipment such as a shower head or a mist generating facial device.

Hereinafter, the present invention will be described in more detail.
In the present invention, even if the pH immediately after the solid bath is dissolved is neutral or weakly alkaline with a specific value, an environment in which the neutralization reaction occurs efficiently in the bath appears, and the reaction is continued for a certain time. The concentration of carbon dioxide dissolved in water is sufficiently high, so that the dissolved carbonic acid component can be made into high-concentration bicarbonate ions, and some can be made into free bicarbonate ions in hot water. .

  In the present invention, PH immediately after dissolution of the solid bath preparation is important to be in the range of PH 5.5 to 9.0 in order that the dissolved carbon dioxide component is neutralized and dissolved in high concentration as bicarbonate ions. In the range of pH 6.0 to 8.0, carbon dioxide generation and efficient conversion to bicarbonate occur, and in combination with a structure substantially free of bicarbonate sequestering substance, It is important in terms of enhancing the detergency of mineral stains on hair and hair.

  The meaning of PH immediately after dissolution means that immediately after dissolution of the bath agent, bicarbonate ions spontaneously volatilize carbon dioxide gas even in the vicinity of neutral PH, and PH gradually increases. Even if the pH is 7.0, the pH changes to about 7.5 after 24 hours, and the pH further increases by blowing air in a jet bath or the like. Therefore, it is appropriate to specify the PH after dissolution as the PH immediately after.

  Whether it's face wash, shampoo, shower, footbath, bath, the required amount of solid bath is 20g to 100g (0.01% to 5%) per 200 liters. The PH immediately after the agent is dissolved is the PH value necessary for the presence of bicarbonate ions at a high concentration.

  The solid bath preparation according to the present invention is adjusted to have the PH value of the present invention with an acid or alkaline pH adjuster as necessary, so that a neutralization reaction occurs efficiently and is suitable for dissolving in hot water. One feature of the present invention is that the pH of hot water or aqueous solution in which carbon dioxide gas is generated at a rate and the solid bath is completely dissolved can be neutralized to a specific value. In particular, it is a preferred embodiment to adjust the pH using sodium carbonate.

  Naturally, neutralization is unlikely to occur in neutrality, but in powders, granules, or tablets, bicarbonate and organic acid come into contact with high concentrations, causing neutralization reaction, while dissolving a large amount of dissolved water PH, From neutral to weakly alkaline.

  In the present invention, the amount of the organic acid added to the bicarbonate is effective as long as the pH adjustment is within the range of the present invention, but it is desirably 1/50 to 2/3, particularly 1 / 10 to 1/3 is preferable.

As a result, the generated carbonic acid component is neutralized to become bicarbonate ions, but even if bicarbonate is added from the beginning, the body warms up and no bathing effect is obtained, so as with natural carbonated springs, We are confident that we have made a surprising discovery that no effect on health, beauty or aesthetics can be obtained unless carbon dioxide gas is generated and bicarbonate ion is generated via the carbon dioxide gas. ing.

  In this way, when the hot water and water are in a neutral state, the bicarbonate and the organic acid such as citric acid react slowly and finely, so that the high bathing effect of the present invention can be obtained and a product with high added value can be provided. .

  The above effect of the present invention is by granulating bicarbonate and organic acid with polyethylene glycol, mixing them under conditions within a certain ratio, and designing the bath so that the PH immediately after dissolution is within a certain range, When water penetrates into the bath, it reacts vigorously, uniformly and continuously, and the generated carbon dioxide bubbles are generated as fine carbon dioxide gas of micro size, and the bath agent generates many small bubbles until the end. Before it comes out into the air, it dissolves in water, and the concentration of carbon dioxide and dissolved bicarbonate ions in the liquid can be increased unnecessarily. The effect of the present invention is exerted to the maximum when the bath is adjusted to have a constitution of 5.5 to 8.5 and does not substantially contain a bicarbonate sequestering substance.

  Furthermore, in the present invention, since the mixture of bicarbonate is a granulated material prepared by coating with polyethylene glycol using a fluidized bed, the effects of the present invention such as a uniform reaction in the tablet are exhibited. Is greatly demonstrated.

  Further, in the present invention, when the solid bath preparation of the present invention is used as a tablet, the neutralization reaction efficiency inside the tablet can be maximized even though the solution becomes neutral as the tablet hardness increases.

  The bicarbonate sequestration substance referred to in the present invention is an organic or inorganic compound containing mineral components such as calcium and magnesium, and specifically, calcium sulfate, calcium silicate, calcium carbonate, calcium oxide, calcium hydroxide and the like. This refers to calcium salts and magnesium salts such as magnesium sulfate, magnesium silicate, magnesium carbonate, magnesium oxide, magnesium hydroxide, and magnesium stearate.

  Specific examples are as described above, but other compounds containing calcium and magnesium have the same effect of sequestering bicarbonate ions, and the present invention does not contain these bicarbonate sequestering compounds. It is indispensable to exert an effect.

  As the organic acid used in the present invention, citric acid, fumaric acid, succinic acid, malic acid and the like are used. However, the use of an organic acid containing at least citric acid can more effectively neutralize the reaction in the bath. Sustained and fine bubbles can be generated, and the effects of the present invention can be exhibited more significantly as a preferred compound.

  In addition, when obtaining a granulated product by granulating at least one of bicarbonate or organic acid in a fluidized bed, when using a mechanical fluidized bed granulator that does not substantially use air as a stirring action, The reaction in the tablet can be enhanced efficiently. As the fluidized bed of the mechanical stirring method, since the powder is flowed using mechanical blades such as a propeller without using air for stirring, the moisture brought in from the humid air during granulation It is possible to evacuate with a vacuum pump during granulation without reducing the amount of polyethylene glycol, and granulation can be achieved by lowering the amount of polyethylene glycol. It is preferably used because it can exhibit an effect that can be reduced.

A mechanical fluidized bed granulator that does not substantially use air as a stirring action is a mixer that arranges a chamfered shovel in a horizontal drum, causes centrifugal diffusion and vortex flow, and causes three-dimensional flow. For example, it is sold in the market as a product made in Germany Leedige or Matsuzaka Giken.

  More preferably, the granulator is equipped with a vacuum pump for reducing the pressure. That is, it is preferable in order to improve the effect of the present invention by reducing the pressure during cooling and operating so that even a little moisture can fly. Furthermore, it is preferable to have a chopper for preventing the granulated granules from becoming coarse particles upon cooling. That is, the effect of reducing the diameter of the carbon dioxide gas bubbles of the present invention to a micro size is exhibited by operating the chopper during cooling to adjust the particle size, which is a more preferable granulation method.

  In the present invention, the most preferable production method is to granulate sodium bicarbonate by a fluidized bed granulator using polyethylene glycol and a mechanical stirring system, and to the granulated product a certain amount of organic acid and anhydrous sodium carbonate and The effect of the present invention is greatly exhibited by adding polyethylene glycol, mixing, and compression molding at high pressure to obtain a solid bath agent.

  Of course, the mixture mainly composed of organic acid is also granulated with polyethylene glycol, mixed with polyethylene glycol without granulating bicarbonate, and mixed with organic acid granulated product to obtain tablets. In addition, the amount of the compound to be granulated is a relatively small production method from the viewpoint of process, but in any case, either the bicarbonate or the organic acid is used from the viewpoint of cost. It is desirable to produce by simply granulating and mixing one side. Even if this granulated product is used as a powder, the effect of the present invention is exerted greatly, but by compressing and forming a single tablet, the neutralization reaction of the present invention is maintained for a long time and dissolved carbon dioxide gas. Can be increased. However, it is also a preferable production method that both bicarbonate and organic acid are mixed or coated with polyethylene glycol.

  The PEG used in the present invention is preferably one having an average molecular weight of 1000 to 8000 in view of the effects of the present invention. PEG having an average molecular weight of about 6000 may make the granulation result preferable from the viewpoint of improvement in molding stability, wrinkle adhesion resistance, capping and tablet molding speed by a compression molding tablet machine such as a rotary tableting machine. When the powder / granule or tablet is dissolved in hot water, the carbon dioxide component can be dissolved to the maximum in bicarbonate ions, and the solid solvent of the present invention comprising the powder / granule or tablet has a hardness and thickness. The effect of the present invention can be conspicuous as the diameter and diameter increase.

  The ratio of polyethylene glycol to 100 parts by weight of granulated product A or mixture A of bicarbonate (sodium bicarbonate or potassium bicarbonate) is 1/100 to 1/5, particularly preferably 1/100 to 1/10, When the ratio of PEG is less than the above amount, the diameter of the carbon dioxide bubble is increased and the foaming time is shortened, and the carbon dioxide component dissolved in the hot water may not be increased. On the other hand, the amount of polyethylene glycol is larger than the above amount. As a result, the amount of bubbles generated is suppressed, and the amount of carbon dioxide gas dissolved in the same manner may be reduced.

  Further, in the present invention, after obtaining a granulated product A or PEG mixture A of bicarbonate, and adding an organic acid or organic acid granulated product B or PEG organic acid mixture, anhydrous sodium carbonate or anhydrous potassium carbonate is added. By adding an anhydride such as the above, the effect of the present invention can be exhibited more remarkably, and the amount of foaming can be increased for a long time while the bubble diameter of carbon dioxide gas is made optimally small. It turns out that it is obtained.

  Moreover, as an effect of this anhydride, it is a compound that exhibits the effect of the present invention more preferably when anhydrous sodium carbonate is added.

Further, in the present invention, when the organic acid is not granulated, and only the polyethylene A is added to and mixed with the granulated product A and the organic acid, and the solid powder / granule or the tablet is formed by compression molding, It was found that the foam of the size was foamed for a long time, and the carbon dioxide component dissolved in the hot water could be increased, and a good bath agent could be obtained. In this case, it is a desirable manufacturing method in which the steps can be greatly omitted and the cost effect is also achieved.

  On the other hand, the micro-sized foam of the present invention is foamed for a long time and dissolved in hot water even in the case of compression molding simply by granulating organic acid with PEG and mixing bicarbonate and PEG at a constant temperature. When the carbon dioxide component to be used is maximized, the process can be largely omitted, and the cost effect is combined, it has been found that this is a desirable manufacturing method.

  The ratio of polyethylene glycol to organic acid used in this production method is preferably 5 to 15 parts by mass with respect to 100 parts by mass of organic acid.

  The amount of organic acid or organic acid mixture B or organic acid granulation B added to bicarbonate granulate A or PEG mixture A is not specified, but is preferably 1/50 to 2/3, particularly preferably 1. It is desirable that the ratio is from / 10 to 1/3 to maximize the effects of the present invention.

  Although the effect of the present invention can be obtained by adding an anhydride without any particular granulation, more preferably, the organic acid is added together with polyethylene glycol or PEG granulated B, and granulated A It is possible to prepare a solid bath agent having a preferable neutralization reactivity by mixing and tableting with a powder or compression molding.

  Furthermore, in the present invention, either the step of creating the granulated product A or the mixture A, or the step of mixing the granulated product A with the organic acid or the granulated product B, either powder, granulation or compression molding It is preferable to add an anhydride to the process.

In the present invention, it is desirable to use sodium lauryl sulfate, sodium lauroyl sarcosinate, sodium myristoyl methylalanine, sodium lauryl sulfonate, sodium n- (normal) octane sulfonate, tetradecene as compounds desirable to be used for powder mixing and tableting. Sodium sulfonate is used. Among these, it is sodium n- (normal) octane sulfonate and sodium tetradecene sulfonate that can obtain the effects of the present invention remarkably. That is, both of these compounds not only maintain microtransparency foaming when the bath agent according to the present invention is dissolved in hot water and maintain the transparency of the hot water after dissolution, but also maintain the body warming by the bath agent. A favorable effect is also exhibited in terms of improving the effect.
The amount of sodium n- (normal) octanesulfonate and sodium tetradecenesulfonate of the present invention may be about 0.0005 to 0.01% by mass of the solid bath preparation according to the present invention.

  In the present invention, in addition to the main component, other components (additives) can be mixed as necessary. Examples of other additives include health ingredients such as hyaluronic acid, fragrances, pigments, surfactants, and the like, and if necessary, anhydrides such as sodium carbonate. However, those belonging to bicarbonate sequestering substances are excluded.

  Examples of organic acids or organic acid mixtures B and granulated products B include anhydrides such as sodium carbonate, fragrances, pigments, surfactants, polyethylene glycol, and the like as desirable additives.

For compression molding to mix powders or produce tablets, known compression molding machines can be used without any particular restrictions, such as hydraulic press machines, single-shot tablet machines, rotary tablet machines, briquetting machines, etc. Can be used. The size of the punch used in this tableting machine or the like is preferably 7 mm or more when the punch is circular, and when the punch is a triangle or square, the diameter is 7 mm or more when converted to a circular punch. Those are preferred. The same applies to the thickness of the ridge. When obtaining a round tablet product, the diameter of the tablet is preferably 7 mm or more, more preferably 10 mm or more, and the thickness is also 7 mm or more, preferably 10 mm or more. More preferably, the diameter and thickness are each 7 mm or more.

  As described above, when a tablet is used, the shape does not necessarily have to be a circle having a flat surface, and the shape is not limited in any way as long as it is a solid body of 7 mm or more, whether it is an oval, a tablet, or a sphere.

  In the present invention, it is preferable to cause micro-size foaming slowly in a hard solid of a certain size or more and to dissolve carbon dioxide gas in the liquid more efficiently, so that the hardness is preferably 15 kg or more, and the diameter and thickness Is more preferably 7 mm or more, the hardness is particularly preferably 18 kg or more, the higher the hardness, the more effectively the generation of carbon dioxide in the tablet and the efficient dissolution of carbon dioxide in the bath, The bubble diameter is reduced, yielding favorable results.

  Hereinafter, hardness, which is a preferable requirement when the solid bath preparation of the present invention is used as a tablet, will be described.

In order to realize the present invention, the hardness of a tablet is measured using a micro Vickers hardness tester Mitutoyo HM-221 which is one of hardness testers used in Examples of many patent specifications. To do.
The Vickers hardness in the present invention is a measured value of 4 times, and is HV, kg / mm ² unit.
It was found that by performing the measurement about four times, if the average value of the results was taken, a considerably correct measurement was possible.
(Implemented with a testing machine owned by the Tokyo Metropolitan Industrial Technology Research Center, Jonan Branch)

  When the bubble diameter of the carbon dioxide gas generated in the liquid, which is a preferable tablet condition of the present invention, is measured visually, the tablet diameter is 7 mm or less, and the bubbles are uniformly generated, the neutralization reaction is finished, and the tablet is finished. Measure the Vickers hardness using 12 samples of 7 lots of the test produced tablets so that the tablets will remain sinking until they are completely dissolved and carbon dioxide can be dissolved in the liquid efficiently. However, if the average value is measured four times, the fluctuation width of the measured value of the Vickers hardness can be ignored, and the tablet has a surface average Vickers hardness of 15 kg or more, preferably 18 kg or more (most preferably 25 kg or more). It was confirmed that

  At the same time, the hardness as the tablet breaking strength from the diameter direction was measured.

In this method, the breaking strength of the tablet is measured. The hardness [kgf] of the tablet was measured four times using a digital tablet hardness tester New Speed Checker TS75NL manufactured by Okada Seiko Co., Ltd. as a hardness measurement method in the diameter direction. . In this case as well, the hardness was reproducible, and no large variation in value was observed, but it was found that it was appropriate to express the effect of the present invention.

  One of the characteristics of the present invention is that it is a composition that does not substantially contain a bicarbonate sequestering substance. In the present invention, the bicarbonate sequestering substance is an inorganic compound and an organic compound containing mineral components such as calcium and magnesium as described above, and specific examples are described above.

In the present invention, if there is a bicarbonate sequestering substance, the bicarbonate ions generated in the hot water according to the present invention will be sequestered. For this reason, mineral stains that are ionically bonded to body and hair proteins and keratin. The action of adhering to and dissolving can not be achieved. On the other hand, if there is no bicarbonate sequestering substance, the mineral stain adheres to the bicarbonate ions and is removed, resulting in a negative ion body / hair surface, which is naturally covered by a cationic component such as lotion, conditioner, rinse, etc. It can be returned to the state.

  In the present invention, it is desirable not to add compounds other than the compound of the present invention as much as possible. However, 1 or 2 of an acidic component, an alkali component, a scent component, a gorgeous hot spring component, etc., which do not belong to the bicarbonate sequestering substance, as necessary. The above can also be added.

  In the present invention, if the organic acid component relative to the amount of bicarbonate is larger than the preferred range of the present invention, the bubble size is large, the reaction may be intense and the reaction may be terminated in a short time, and the amount of bicarbonate relative to the amount of bicarbonate If the amount of the organic acid component is too small, the neutralization reaction does not occur efficiently, and the generated carbon dioxide gas is reduced, and the effects of the present invention may not be exhibited.

  If the amount of bicarbonate is too small, the amount of polyethylene glycol used must be increased, otherwise the neutralization reaction will be too intense and the bubble diameter will be increased, impairing the effects of the present invention. There is a case. Also, even when the amount of polyethylene glycol is large or small relative to the amount of bicarbonate or organic acid, the neutralization reaction may not occur uniformly and continuously, and the bubble diameter may not be constant. is there.

  As described above, after adding the necessary components of the present invention in the preferred amount ratio of the present invention, a pH adjusting agent that sufficiently exhibits the effects of the present invention is added, and the pH in the bath after dissolution is increased. It is a desirable embodiment to be within the scope of the present invention.

  As the PH adjuster used in the present invention, sodium carbonate, sulfuric acid, or an organic acid is preferably used. However, any publicly known and publicly available one can be used without any particular limitation, and in particular, a PH adjuster as a food additive. It is preferable from the viewpoint of safety that the bath agent may enter the eyes and mouth. For example, trisodium citrate (sodium citrate), disodium citrate, monosodium citrate, potassium gluconate, sodium gluconate, disodium succinate, sodium acetate, DL-sodium tartrate, L-sodium tartrate, potassium carbonate , Sodium bicarbonate, sodium carbonate, sodium lactate, DL-sodium malate, and the like.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, the aspect of this invention is not limited to these.
[Example-1]
Granulation of raw materials of Comparative Example and Invention Example (PK and JK) 460 kg of sodium hydrogen carbonate and 20 kg of polyethylene glycol # 6000 were added to an improved model of RED1200 manufactured by Matsuzaka Giken Co., Ltd., granulated at 60 ° C., and cooled after completion. And granulated material A0 was obtained.

Similarly, A0 is added to the modified model of Rot 1200 of Matsuzaka Giken, and 85 kg of citric acid, 8 kg of polyethylene glycol # 6000 and 9 kg of anhydrous sodium carbonate are mixed, and 100 g of a bicarbonate sequestering material shown below is added to 10 kg of this sample. After mixing, 5 kg was collected and bath powders PA to PK were prepared. Each of the remaining powders was applied with an oil press mold (manual tablet manufacturing machine) manufactured by Upright Power Industry [Applied Power Japan Co., Ltd.] (former company name: Toyo Hydraulic Machinery Co., Ltd .: model: SPLF-SPF-393). A JK bath tablet was prepared from a tablet JA having a thickness of 11 mm.

Upon molding by the manual tablet manufacturing machine, 100 g of each of the following bicarbonate sequestering substances was added to obtain PA to PK and JA to JK. In addition, all powders and tablets were set to PH 7.1 of the present invention, and PH adjustment was performed with the above-mentioned food additive sodium carbonate and organic acid.

In the case of powder PA) Calcium carbonate PB) Calcium hydroxide PC) Calcium sulfate PD) Calcium silicate PE) Calcium oxide PF) Magnesium sulfate PG) Magnesium stearate PH) Magnesium hydroxide PI) Magnesium oxide PJ) Magnesium silicate PK) No bicarbonate sequestering substance

In the case of tablets JA) Calcium carbonate JB) Calcium hydroxide JC) Calcium sulfate
JD) Calcium silicate JE) Calcium oxide JF) Magnesium sulfate JG) Magnesium stearate JH) Magnesium hydroxide JI) Magnesium oxide JJ) Magnesium silicate JK) No bicarbonate sequestering substance

Performance evaluation work of solid bath preparation of Example

(Evaluation-1) Effect of warming at the time of bathing (measurement of the skin temperature of the subject with footbath)
In a room at 24 ° C, both feet are immersed for 15 minutes in a constant temperature footbath device in which 25 g of a bath preparation is poured into 20 liters of hot water at 38 ° C, and the surface of the foot after 1 hour is photographed with a thermography TVS500IS. The sustainability of warming was performed by three subjects, and the results were evaluated according to the following evaluation criteria. The results are shown in Tables 1 and 2.

A: The entire thermographic shooting screen after 1 hour is red and the body is warm enough. A plurality of ◎ marks indicate that the warming effect continues.
○: The thermographic shooting screen after 1 hour is yellow, and a warm effect is observed. (Triangle | delta): The imaging | photography screen of the thermography after 1 hour is a middle grade of yellow and blue, and a warming effect is inadequate.
×: Thermographic pictures after 1 hour are mostly blue, and the warming effect is the same as ordinary hot water.
However, a plurality of different marks indicate intermediate effects.

(Evaluation-2) Facial cleansing esthetic effect 15 g of bath preparation sample was put into 10 liters of hot water at 39 ° C, the subject put on his face and performed facial cleansing with both hands, wiped with a towel 3 minutes later, and the facial condition was touched Evaluation (3 subjects).
The thermography of the skin surface was photographed and evaluated, and the results are shown in Tables 1 and 2.

A: The thermographic imaging screen after 3 minutes is red in color, the face is well-colored, and the skin feels smooth and smooth. Multiple asterisks indicate that both effects continue.
○: The entire thermographic shooting screen after 3 minutes is yellow, the face has a warming effect, the skin feels smooth, and is recognized as being quite good.
(Triangle | delta): The imaging | photography screen of a thermography after 3 minutes is a middle grade of yellow and blue, the warming effect of a face is recognized a little, and the touch feeling of skin is a grade which is a little smooth.
X: The photograph of the thermography after 3 minutes has a lot of blue color, the effect of warming is not so much, it is not different from normal hot water, the touch feeling of the skin is not smooth, and it cannot be said that it is very good.
However, a plurality of different marks indicate intermediate effects.

(Evaluation-3) Hair washing test, mineral stain washing 30 g of bath preparation sample was dissolved in 39 liters of 20 liters of hot water, the hair of a subject with long hair of about 60 cm was washed for 3 minutes, and after shampooing a cationic rinse treatment, Thereafter, the hair was washed with running water at 38 ° C. to finish.
Before wiping with a towel, grate the hair from top to bottom with both hands, assess the goodness of the hair splitting first, measure the thickness of the hair after drying with a measure, and evaluate the firmness of the hair As a substitute evaluation of the cleaning effect of mineral stains, the results are shown in Tables 1 and 2 (3 subjects).

◎: The hair slips out well with hands, the hair does not get tangled at all, the hands slip out smoothly, the hair thickness after drying is sufficient, the volume feels more than 5cm, and the firmness is firm I understand. A plurality of ◎ marks indicate that the hair thickness and volume feel are more excellent.
○: The omission when hand-held is not bad, the hair is not so entangled, the hair thickness after drying is about 3 cm in height, and the firmness is firm.
(Triangle | delta): The omission at the time of a hand is not bad, the hair is the extent which does not get entangled very much, the thickness of the hair after drying, the volume feeling are about 1 cm in height, and firmness is somewhat firm.
X: Poor omission when rubbed with hands, hair gets tangled and hands do not come off well, hair thickness and volume after drying are poor, and it sticks tightly to the head and does not give a volume feeling.
However, a plurality of different marks indicate intermediate effects.

[Table 1] In the case of powder

[Table 2] In the case of tablets

As is clear from Tables 1 and 2, it can be seen that when there is no bicarbonate sequestering substance according to the present invention, the effects of warming the skin, washing the face and washing the hair are all high and effective.
On the other hand, when a bicarbonate sequestering substance is present, the effects of warming the body, washing the face, and washing the hair are low and not good.

[Example-2]
460 kg of sodium hydrogen carbonate and 20 kg of polyethylene glycol # 6000 were added to an improved version of the Redige mixer VT1200 manufactured by Matsuzaka Giken Co., Ltd., granulated at 60 ° C., and cooled after completion to obtain a granulated product A0.

  Similarly, A0 is added to the modified model of Rot 1200 of Matsuzaka Giken Co., Ltd., 8 kg of polyethylene glycol # 6000 and 9 kg of anhydrous sodium carbonate are mixed, and 10 kg of this sample is divided into 6 parts, and the organic acids shown below are respectively added. After adding and mixing, 5 kg was collected from each to prepare bath powders of powders PL to PQ (when there was no bicarbonate sequestering substance).

On the other hand, each of the remaining powders was added with a weight of 10 t by an oil press mold (manual tablet manufacturing machine) manufactured by Upright Power Industry [Applied Power Japan Co., Ltd.] (former company name: Toyo Hydraulic Machinery Co., Ltd .: Model: SPLF-SPF-393), Tablets JL to J with a diameter of 30 mm and a thickness of 11 mm
Q bathing tablets (no bicarbonate sequestering material) were made. In addition, all powders and tablets were set to PH 7.4 of the present invention, and PH adjustment as the food additive was used for pH adjustment.

When there is no bicarbonate sequestering substance PL in case of powder) DL-malic acid 1850 g
PM) Adipic acid 1850 g
PN) Oxidic acid 1850g
PO) 1850 g of succinic acid
PP) Fumaric acid 1850g
PQ) Citric acid 1850g

In the case of tablets JL) DL-malic acid 1850 g
JM) Adipic acid 1850 g
JN) Oxidic acid 1850g
JO) Succinic acid 1850g
JP) 1850 g of fumaric acid
JQ) Citric acid 1850g

[Table 3] When powder is used When there is no bicarbonate sequestering agent

[Table 4] When there is no bicarbonate sequestrant for tablets

Further, in the above experiment, 200 g of calcium sulfate as a bicarbonate sequestering agent was added to 10 kg of the sample and the same experiment was performed and the results of evaluation were shown in Tables 5 and 6 below.

When there is a bicarbonate sequestering substance, it is PLCa in the case of powder. DL-malic acid 1850 g
PMCa) Adipic acid 1850g
PNCa) Oxidic acid 1850g
POCa) Succinic acid 1850g
PPCa) Fumaric acid 1850g
PQCa) Citric acid 1850g

JLCa for tablets) DL-malic acid 1850g
JMCa) Adipic acid 1850g
JNCa) Oxidic acid 1850g
JOCa) 1850 g of succinic acid
JPCa) 1850 g of fumaric acid
JQCa) Citric acid 1850g

[Table 5] In the case of powder, if there is a bicarbonate sequestering agent

重炭酸イオン封鎖剤がない場合、本発明の有機酸が好結果を示すが、有機酸が良い結果を示す条件下でも重炭酸イオン封鎖剤が存在すると、良い結果は全く得られないことがわかる。 [Table 6] In the case of tablets When there is a bicarbonate sequestering agent

In the absence of a bicarbonate sequestering agent, the organic acid of the present invention shows good results, but even when the organic acid sequestering agent is present, no good results are obtained. .

[Example-3]
460 kg of sodium hydrogen carbonate is added to a modified model of RED1200 manufactured by Matsuzaka Giken Co., Ltd., granulated at a powder temperature of 45 ° C. and 80 kg of polyethylene glycol # 6000, and granulated when the powder temperature reaches 70 ° C. This was indirectly cooled with cold water at 20 ° C. to obtain a granulated product A02.

  Further, 100 kg of citric acid and 20 kg of PEG # 6000 were added to the improved model of Matsuegi Giken's Redige Mixer VT1200 from the powder temperature of citric acid from 45 ° C, granulated, and granulated at a powder temperature of 69 ° C. Was stopped, and the powder was indirectly cooled with cold water at 20 ° C. to obtain a granulated product B02.

The prepared products A02 and B02 were mixed and 10 kg was collected, 10 g of each of the following additives PR to PX was added to 10 kg of each powder, and a tablet was prepared by the following method and evaluated.
In other words, tablet compression molding is performed using Uplite Power Industry [Applied Power Japan Co., Ltd.] (former company name: Toyo Hydraulic Machinery Co., Ltd .: Model: SPLF-SPF-393), and an oil press mold (manual tablet manufacturing machine) is applied with a weight of 10 t. Bathing tablets of tablets PR to PX having a thickness of 30 mm and a thickness of 11 mm were prepared. In addition, any tablet is within the PH value of the present invention, and when pH adjustment is necessary, the pH adjuster as the food additive was used.
The performance as a bath agent was evaluated according to the evaluation method.

PR) Magnesium stearate (comparative example)
PS) sodium lauryl sulfate PT) sodium lauroyl sarcosinate,
PU) Sodium myristoyl methylalanine PV) Sodium lauryl sulfonate,
PW) Sodium n- (normal) octanesulfonate PX) Sodium tetradecenesulfonate

[Table 7]

[Example-4]
460 kg of sodium hydrogen carbonate is added to a modified model of RED1200 manufactured by Matsuzaka Giken Co., Ltd., 50 kg of polyethylene glycol # 6000 is added at a powder temperature of 45 ° C., granulated, and granulation is performed when the powder temperature reaches 70 ° C. This was indirectly cooled with cold water at 20 ° C. to obtain a granulated product A02.

The following J12 to J18 amounts of citric acid were added to the product A02, 30 kg of PEG # 6000 was added, and the powder was mixed to obtain each granulated product B02. The pH was adjusted with anhydrous sodium carbonate and sulfuric acid so that the pH when dissolved in hot water was around 7.0.

J12: Citric acid (550kg)
J13: Citric acid (300kg)
J14: Citric acid (150kg)
J15: Citric acid (100kg)
J16: Citric acid (60kg)
J17: Citric acid (30kg)
J18: Citric acid (5kg)

  Into each of these mixtures, 9 kg of anhydrous sodium carbonate and 10 kg of polyethylene glycol # 6000 were added, and the mixed powder was used as Upright Power Industry [Applied Power Japan Co., Ltd.] (former company name: Toyo Hydraulic Machinery Co., Ltd .: Model: SPLF-SPF-393). ) By using an oil press mold (manual tablet manufacturing machine), a weight of 10 t was added, and tablets J12 to J18 having a diameter of 30 mm and a thickness of 11 mm were prepared, evaluated above, and the results are shown below. In addition, any tablet is within the PH value of the present invention, and when pH adjustment is necessary, the pH adjuster as the food additive was used.

上記結果から、重炭酸塩に対するクエン酸（有機酸）の添加量は問わないが結果には最適な領域があり、重炭酸塩量に対し最適な有機酸の量により本発明の効果が、より良く発揮されることが分かる。
即ち、重炭酸塩に対し、１／５０〜２／３量が好ましく、特に１／１０〜１／３が好ましい。
又いずれの実施例でも、粉末製剤よりは錠剤の場合が好結果を得ることが分かった。また錠剤は硬度が高いほどよい結果が得られたが、いずれの場合でも重炭酸イオン封鎖剤封鎖物質がある場合は良い結果は得られなかった。
さらに、上記実施例−１から実施例−４中、本発明例の全てにおいて、ＰＨ値を本発明外の５．５未満及び９．０超とした場合、各実施例における本発明の効果が得られないことが確認された。 [Table 8]

From the above results, the amount of citric acid (organic acid) added to the bicarbonate is not limited, but there is an optimal range of results, and the effect of the present invention is improved by the amount of the organic acid optimal to the amount of bicarbonate. It turns out that it is well demonstrated.
That is, 1/50 to 2/3 amount is preferable with respect to bicarbonate, and 1/10 to 1/3 is particularly preferable.
In any of the examples, it was found that the tablet obtained better results than the powder preparation. In addition, the higher the hardness of the tablet, the better results were obtained, but in any case, when there was a bicarbonate sequestering substance, good results were not obtained.
Furthermore, in all the examples of the present invention in the above Examples-1 to 4, when the PH value is less than 5.5 outside the present invention and more than 9.0, the effect of the present invention in each example is It was confirmed that it could not be obtained.

Claims (2)

In a solid bath containing bicarbonate (sodium bicarbonate or potassium bicarbonate) and an organic acid, and not containing birch sap and aluminum salt ,
The aqueous solution immediately after dissolving the solid bath agent has a pH of 5.5 to 9.0, and does not contain a bicarbonate sequestering substance which is a compound containing calcium and magnesium ,
The organic acid is at least one of citric acid, fumaric acid, succinic acid, malic acid, and a solid bath containing anhydrous sodium carbonate and / or anhydrous potassium carbonate;
Immerse your feet in hot water in which the solid bath is dissolved to suppress the bicarbonate ions in the hot water from being sequestered by the bicarbonate sequestering substance,
A method for warming a bath in footbaths, characterized in that it maintains the warming effect of the foot skin surface. In a solid bath containing bicarbonate (sodium bicarbonate or potassium bicarbonate) and an organic acid, and not containing birch sap and aluminum salt ,
The aqueous solution immediately after dissolving the solid bath agent has a pH of 5.5 to 9.0, and does not contain a bicarbonate sequestering substance which is a compound containing calcium and magnesium ,
The organic acid is at least one of citric acid, fumaric acid, succinic acid, malic acid, and a solid bath containing anhydrous sodium carbonate and / or anhydrous potassium carbonate;
Immerse your feet in hot water in which the solid bath is dissolved to suppress the bicarbonate ions in the hot water from being sequestered by the bicarbonate sequestering substance,
A solid bath preparation for warming when bathing in footbaths, characterized in that it maintains the warming effect of the foot skin surface.